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1

Assessment of the Efficiency of Hematite Quartzite Enrichment Technologies

Oliinyk Tetiana, Sklyar Liudmila, Kushniruk Natalia, Holiver Nadiya, Tora Barbara

Inżynieria Mineralna

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2023

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no. 1

33--44

EN

The present paper deals with the problem of developing an efficient technology for the enrichment of hematite ores. The aim of the research is to investigate the process properties of thinly disseminated hematite ores of Ukraine, taking into account their mineralogical characteristics, to develop flowsheets for the enrichment of hematite ores and to assess the efficiency of mineral separation during enrichment by gravity, magnetic, and flotation methods. The research was carried out on a sample of hematite ores from the Kryvyi Rih iron ore basin of Ukraine, which consisted of 9 mineralogical ore types, distinguished by the quantitative ratio of the main groups of ore and non-ore minerals. As a result of WLIMS magnetic separation with a magnetic field induction of 0.07 T, an iron-containing concentrate with a mass fraction of 63.5% iron was obtained from ore with a size of minus 0.074+0 mm, with a total iron recovery of 12.8%. It was found that with an increase in the magnetic field induction from 0.2 to 0.8 T, the recovery of total iron in the WНIMS magnetic product increased from 78.8 to 86.9%. The mass fraction of total iron in the WНIMS magnetic product was 57.9–59.8%. Losses of total iron with the non-magnetic product ranged from 21.2 to 13.1% with a mass fraction of total iron of 32–27.8%. The mass fraction of SiO2 in the magnetic product was 11–13.8%. Flotation research resulted in a hematite concentrate with a mass fraction of total iron of 64.05–65.95%, with iron recovery in the concentrate of 60.3–70.68%. Based on the results of process tests, seven variants of flowcharts for the enrichment of hematite ores were developed. The schemes were evaluated by the Hancock efficiency criterion, which ranged from 42.49–64.7%. The magnetic flotation technology for the enrichment of hematite quartzite was recommended for implementation. This technology makes it possible to obtain a commercial concentrate with a mass fraction of total iron of 37.02% from hematite ore with a mass fraction of total iron of 65.41%.

PL

W artykule podjęto problem opracowania wydajnej technologii wzbogacania rud hematytu. Celem badań jest zbadanie właściwości procesowych słabo rozsianych rud hematytu Ukrainy, z uwzględnieniem ich właściwości mineralogicznych, opracowanie schematów wzbogacania rud hematytu oraz ocena skuteczności separacji minerałów podczas wzbogacania grawitacyjnego, magnetycznego i metody flotacji. Badania przeprowadzono na próbce rud hematytu z krzyworoskiego zagłębia rud żelaza na Ukrainie, która składała się z 9 mineralogicznych typów rud, wyróżniających się stosunkiem ilościowym głównych grup minerałów kruszcowych i nierudnych. W wyniku separacji magnetycznej WLIMS przy indukcji pola magnetycznego 0,07 T otrzymano koncentrat zawierający żelazo o udziale masowym żelaza 63,5% z rudy o wielkości minus 0,074+0 mm, przy całkowitym uzysku żelaza 12,8%. Stwierdzono, że wraz ze wzrostem indukcji pola magnetycznego od 0,2 T do 0,8 T, uzysk żelaza ogólnego w produkcie magnetycznym WNIMS wzrósł z 78,8% do 86,9%. Udział masowy całkowitego żelaza w produkcie magnetycznym WIMS wynosił 57,9–59,8%. Straty żelaza ogólnego z produktem niemagnetycznym wahały się od 21,2% do 13,1% przy udziale masowym żelaza całkowitego 32–27,8%. Udział masowy SiO2 w produkcie magnetycznym wynosił 11–13,8%. W wyniku badań flotacyjnych otrzymano koncentrat hematytu o udziale masowym żelaza ogólnego 64,05–65,95%, z odzyskiem żelaza w koncentracie 60,3–70,68%. Na podstawie wyników badań procesowych opracowano siedem wariantów schematów wzbogacania rud hematytu. Schematy oceniono według kryterium sprawności Hancocka, które mieściło się w przedziale 42,49–64,7%. Zarekomendowano do wdrożenia technologię flotacji magnetycznej do wzbogacania kwarcytu hematytowego. Technologia ta umożliwia otrzymanie koncentratu handlowego o udziale masowym żelaza ogólnego 37,02% z rudy hematytu o udziale masowym żelaza ogólnego 65,41%.

2

Magnetic separation of lunar regolith as its beneficiation for construction effort on the Moon

Kobaka Janusz, Katzer Jacek, Seweryn Karol

Artificial Satellites : Journal of Planetary Geodesy

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2023

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Vol. 58, Special Issue 1

203--213

EN

A concept of magnetic separation of regolith for production of lunar aggregate is presented in the paper. Future construction effort on the Moon will require significant amounts of concrete-like composites. The authors formulate a hypothesis that magnetic separation of regolith would be a very efficient beneficiation procedure solving multiple civil engineering problems associated with properties of raw lunar soil. For the research program, 10 lunar soil simulants were used. The magnetic separation was feasible in majority of cases. Acquired lunar aggregate would be useful for both concrete-like composite production and covering the surface of a habitat. The aims of future research are pointed out in the paper.

3

Removing iron impurities from feldspar ore using dry magnetic separation (part one)

Yassin Khaled, Ahmed Mahmoud, Khalifa Mohamed Gamal Eldin Khalifa, Hagrass Ayman Aly

Archives of Mining Sciences

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2023

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Vol. 68, no. 1

19--33

EN

Feldspar is a basic requirement for glass, ceramics, and other industries. The presence of iron in feldspar is one of the challenging aspects of feldspar processing. To improve the quality of feldspar for use in various industries, dry magnetic separation is one of the best techniques for reducing iron in feldspar, especially in arid regions to overcome the common problem of lack of water resources as well as to reduce the operational cost of the enrichment process. Therefore, dry magnetic separation experiments were carried out to remove the iron content from feldspar ore in the Wadi Umm Harjal area in Egypt to meet the specifications required for different industries. The sample was analysed using XRD, XRF, and optical microscopy, which revealed that it is a mixture of potassium feldspar (microcline/orthoclase), albite, and quartz in the presence of hematite mineral serving as the main iron impurities in addition to the free silica content. The effect of parameters on the activity of the dry high magnetic separators was investigated in addition to cleaning the products. The iron oxide reduced from 0.69% in the head sample to 0.08% after dry high-intensity magnetic separation, and the whiteness increased from 82.01% in the head sample to 95.97% in the separated concentrate. The experimental results showed that there is a possibility to obtain feldspar concentrates with low content of Fe2O3 from the area where according to the results, approximately 88.4% of iron was removed from the head sample.

4

Oczyszczanie magnetyczne piasków pochodzenia magmowego na przykładzie kopalni współpracującej z Górażdże Kruszywa

Stempkowska Agata, Gawenda Tomasz, Zieliński Mateusz

Surowce i Maszyny Budowlane

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2022

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nr 2

18--21

PL

Jedną z najważniejszych metod rozdziału mieszanin minerałów, znajdującą zastosowanie w przeróbce wielu surowców mineralnych, jest rozdział ziarn przy wykorzystaniu różnic we własnościach magnetycznych minerałów, nazwany separacją magnetyczną lub wzbogacaniem magnetycznym.

5

Study on recovery of iron and sulfur from high-sulfur magnetite ore

Zhao Yongqiang, Zhou Wen-tao, Sun Tichang, Ahmadzai Asadullah

Physicochemical Problems of Mineral Processing

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2022

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Vol. 58, iss. 4

art. no. 150889

EN

In this paper, to produce a saleable magnetite concentrate with a sulfur level below 0.20% and recover sulfur concentrate, flotation and magnetic separation tests were undertaken. Results showed that the optimum conditions of flotation were established as follows: grinding fineness of 90% particles passing 0.074mm, pH 6, 400 g/t of CuSO4, and 400 g/t of combined collectors. Under these conditions and magnetic separation, S grade of the magnetite concentrate was reduced from 3.20% to 0.18%, and the Fe grade improved from 57.29% to 71.17%. At the same time a sulfur concentrate with S grade of 38.05% and recovery of 91.32% was also obtained. The XPS results showed that the addition of CuSO4 benefited the formation of hydrophobic Sn2-/S0 and Cu+-xanthate, enhancing pyrrhotite floatability. The flotation separation efficiency could be enhanced using a mixture of collectors, and collector mixture demonstrated three synergetic effects, namely enhanced S recovery, improved adsorption behavior of the collectors and enhanced hydrophobicity of pyrrhotite surface.

6

Recovery of Fe and V via selective reduction–magnetic separation of vanadium-titanium magnetite concentrate

Liu Liwei, Li Guofeng, Zhao Libing, Li Jinpeng, Li Yanfeng

Physicochemical Problems of Mineral Processing

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2022

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Vol. 58, iss. 1

50--62

EN

With the aim of separating Fe and V, a vanadium-titanium magnetite concentrate was selectively reduced, followed by magnetic separation. The processes accompanying reduction of the vanadium-titanium magnetite concentrate were investigated using thermodynamic simulation, experiments, scanning electron microscopy, and electron probe microanalysis. Appropriate reduction conditions and controlling the amount of CaCO3 promoted the reduction of Fe-containing minerals to metallic Fe. V was released from magnetite, ilmenite, and titanomagnetite, and was inhibited to reduce to metallic V, leading to V enrichment in the non-magnetic products in the form of oxides. Moreover, the Fe particles wrapped the slag phase when the amount of CaCO3 exceeded 8%, which is unfavourable for the magnetic separation of Fe and V. Magnetic products with an Fe content of 87.19%, Fe recovery of 82.62%, V content of 0.09% and non-magnetic products with a V content of 1.00% and a V recovery of 85.49% were obtained when the vanadium-titanium magnetite concentrate was reduced for 100 min at 1623 K with a C/O molar ratio of 2.5 and 8% CaCO3, followed by separating at a magnetic field strength of 85 mT.

7

Properties of flash roasted products from low-grade refractory iron tailings and improvement method for their magnetic separation index

Wan He, Lu Xianlu, Luukkanen Saija, Qu Juanping, Zhang Chonghui, Chen Yanxin, Bu Xianzhong

Physicochemical Problems of Mineral Processing

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2022

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Vol. 58, iss. 6

art. no. 156725

EN

The properties of flash-roasted products from low-grade refractory iron tailings (IGRIT) and the improved method for their magnetic separation index were investigated by the MLA, XRD, iron phase analysis, and magnetic separation test. The results show the siderite and hematite in the IGRIT have been converted to magnetic iron after the flash roasting treatment with a time of 3-5 s; magnetic iron in roasted products has a monomeric dissociation of 37.20%, and a 75−100% exposed area of contiguous bodies as rich intergrowth was 29.83%, and that a 32.97 poor intergrowth; moreover, magnetic iron is mainly associated with muscovite and quartz. It is also found that the regrindingmagnetic separation (1500 Oe) treatment of the middling was beneficial to obtain more qualified iron concentrate products. Therefore, roasted products magnetic separation process in the absence/ presence of the middling regrinding-magnetic separation treatment obtains an iron concentrate with 60.10%/ 60.12% iron grade and 72.04%/81.13% iron recovery. The iron concentrate from the magnetic separation process with middling regrinding-magnetic separation can have a 9% higher recovery than the process without middling regrinding-magnetic separation. The work is significant for helping to improve the utilization of IGRIT.

8

Exploration on flotation behavior of galena in seawater and related mechanism

Song Ningbo, Sun Chuanyao, Yin Wanzhong, Yao Jin, Yang Bin

Physicochemical Problems of Mineral Processing

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2022

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Vol. 58, iss. 4

art. no. 151524

EN

The utilization of seawater in mineral flotation is the future development trend because of the shortage of fresh water resources. However, at present, the flotation behavior and mechanism of galena in seawater are not clear. Therefore, this paper comprehensively carried out the effect mechanism of seawater on the flotation of galena. Micro-flotation results illustrated that the recovery of galena was higher in deionized water than that in 5×10-2 mol/L MgCl2 solution, 1×10-2 mol/L CaCl2 solution and seawater. Contact angle determination and Zeta potential distribution measurements showed that hydrophilic substances adsorbed on the surface of galena under alkaline conditions. X-ray photoelectron spectroscopy (XPS) analysis further indicated that these substances were hydroxides precipitates, carbonate precipitates and hydroxyl complexes formed by divalent magnesium and calcium ions, which prevented the adsorption of collector on mineral surface. As a result, the galena recovery declined in 5×10-2 mol/L MgCl2 solution, 1×10-2 mol/L CaCl2 solution and seawater.

9

Enrichment of wollastonite with high calcite content

Şavran Ceyda, Türk Tülay, Irgasheva Ganjinakhon, Kangal Murat Olgaç

Physicochemical Problems of Mineral Processing

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2022

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Vol. 58, iss. 5

art. no. 153058

EN

Wollastonite plays a significant role as an industrial raw material in many fields; its exclusive properties mean that it is used in ceramics, paint, metallurgy and coatings. In nature, wollastonite mostly occurs with calcite. While the most common method for separating wollastonite from calcite is calcination, flotation is one of the methods for separating two minerals in a more economic, environmentally friendly way. In this study, the ore contains a large amount of calcite and augite, which is an iron bearing mineral that is subjected to magnetic separation, followed by flotation in order to obtain wollastonite and calcite concentrations individually. The SiO2, CaO and Fe2O3 contents in the ore are 28.00%, 48.20% and 0.45%, respectively. After magnetic separation has reduced the iron content, flotation experiments are carried out to find the optimum conditions. For the flotation process, the effect of particle size, pH and collector dosage are investigated. A wollastonite concentration of 84% purity is successfully achieved, with a 0.17% iron concentration under the optimal conditions of 100 micron particle size, pH 8 and 500 g/t collector dosage. The purity of the calcite is raised to 95% with the application of a cleaning stage.

10

Application of magnetic separation and reverse anionic flotation to concentrate fine particles of iron ore with high sulfur content

Dehghani Fahimeh, Khosravi Rasoul, Pazoki Amir, Kebe Moustapha, Jahanian Reza, Siavoshi Hossein, Ghosh Tathagata

Physicochemical Problems of Mineral Processing

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2022

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Vol. 58, iss. 3

art. no. 145420

EN

The sulfur content in iron ore causes technical problems in the process of sintering iron ore in steel and alloys, and environmental problems in discharging the tailing. The major challenge in the iron ore processing plant is handling the finer particles. The key objectives of this research included the concentration of Band Narges Mine iron ore (< 150 μm) as well as the reduction of the sulfur content to achieve a marketable product. First, the mineralogical characterization of iron ore was established, which showed that Fe3O4, SiO2, and CaO were the predominant minerals in the ore body. Moreover, magnetite particles with a size of < 150 μm were mainly locked into the associated gangue mineral. Second, metallurgical experiments were conducted, including magnetic separation and froth flotation. To increase the iron grade and recovery and decrease the sulfur content, two separate process flowsheets were tested, three steps of magnetic separation with a magnetic field strength of 2000 G were used in the first process flowsheets, followed by regrinding to < 74 μm and application of a three-stage reverse flotation. The overall iron grade and recovery were 76.38% and 67.9%, respectively, from this flowsheet. A five-stage successive reverse flotation followed by three stages of magnetic separation at 1000 G was carried out in the second flowsheet. The final recovery and grade of iron for this flowsheet were 77.15% and 64.3%, respectively. The ultimate content of sulfur was estimated at 0.74%.

11

Beneficiation and Upgrading of Low-Grade Feldspar Ore in Medina, Saudi Arabia

Gougazeh Mousa

Journal of Ecological Engineering

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2022

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Vol. 23, nr 6

271--277

EN

Large reserves of feldspar ore deposits are found in the alkali granite rocks at Al-Madinah province, Saudi Arabia. Magnetic separation and flotation tests were used in order to achieve the aims of this study which are: reduce the iron and titanium contents of Medina feldspar ore, which impart color and decrease the feldspar quality, as well as produce a high-quality feldspar concentrate, which meets the commercial grade of the raw material specifications for the ceramics and glass industry. The obtained results from this study showed that the efficient separation of Feand Ti-bearing minerals could be achieved by a combination of the dry high-intensity magnetic separator at 14.000 gauss and the direct cationic flotations under 500 g/ton dosage of Aero 801 + Aero 825 + Aero 830 mixture in an acidic medium at pH 3. The feldspar concentrate was produced with 65.18 wt.% SiO2, 19.02 wt.% Al2O3, 0.06 wt.% Fe2O3, 0.09 wt.% TiO2 9.09 wt.% K2O and 6.01 wt.% Na2O grades, which meet the commercial scale of feldspar.

12

Magnetic Force computation for a magnetic separator based on permanent magnet

Kassid Fatima Ezzahra, Azelmad Essaâdia, Bousshine Lahbib, Berdai Abdelmajid

Przegląd Elektrotechniczny

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2021

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R. 97, nr 10

28--32

EN

Suspended permanent magnet separator is widely used in many industrial fields. Magnetic force generated by the magnet should be higher than total value of all other competitor forces to attract the particle towards the magnet. In this paper, Approaching the value of magnetic force generated by the magnet and that required to pull the particle is of a great importance for optimum design of separator. a program simulating numerically nodal magnetic force generated by the magnet was proposed and compared with required magnetic force.

PL

Separator z magnesami trwałymi jest szeroko stosowany w wielu dziedzinach przemysłu. Siła magnetyczna generowana przez magnes powinna być wyższa niż całkowita wartość wszystkich innych sił konkurencji, aby przyciągnąć cząstkę do magnesu. W niniejszej pracy duże znaczenie dla optymalnego zaprojektowania separatora ma przybliżenie wartości siły magnetycznej generowanej przez magnes i potrzebnej do odciągnięcia cząstki. Zaproponowano program symulujący numerycznie węzłową siłę magnetyczną generowaną przez magnes i porównano go z wymaganą siłą magnetyczną.

13

The mechanism of CaCO3 in the gas-based direct reduction of a high-phosphorus oolitic iron ore

Wu Shichao, Li Zhengyao, Sun Tichang, Kou Jue, Xu Chengyan

Physicochemical Problems of Mineral Processing

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2021

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Vol. 57, iss. 4

117--124

EN

Gas-based direct reduction and magnetic separation process was applied in treating a high-phosphorus oolitic iron ore, of which phosphorus mainly occured as Fe3PO7 and apatite. The mechanism of CaCO3 was investigated using XRD, SEM-EDS, and mineral phase analysis. Results showed that when no CaCO3 was added, most of the iron minerals were reduced to metallic iron, while Fe3PO7 was reduced to elemental phosphorus and mixed with the metallic iron particles. When a small amount of CaCO3 was added, CaCO3 preferentially reacted with SiO2, Al2O3 and other components, preventing them from reacting with FeO and resulting in the increase of iron recovery. When the amount of CaCO3 reached 25%, apatite was produced from the reaction of CaO and Fe3PO7, which could be later removed by grinding and magnetic separation.

14

Digital image processing (DIP) application on the evaluation of ironrich heavy mineral concentrates produced from river sand using a sequential mineral processing approach

Terzi Mert, Kursun Ilgin, Cinar Mustafa, Ozdemir Orhan

Physicochemical Problems of Mineral Processing

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2021

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Vol. 57, iss. 3

21--35

EN

In this study, the iron-rich heavy mineral concentrate production from river sand as a byproduct of an alternative resource by gravity, magnetic separation, and flotation methods were investigated in detail. For the physical separation of the sample and increasing the Fe2O3 content, a shaking table and a wet high-intensity magnetic separator were used, respectively. The gravity and magnetic separation experiments included rougher, cleaner, and scavenger circuits. In the flotation experiments, cationic flotation with ethylenediamine under acidic conditions, and anionic flotation with sodium oleate under alkaline conditions were performed. The iron and silica content of the products obtained were determined by digital image processing (DIP) methods and compared with the classical analytical procedures. Finally, a flow chart was proposed for the processing of the ore according to the optimum enrichment parameters were determined from the experiments. The results obtained in this study show that it is possible to produce an iron-rich heavy mineral concentrate with Fe2O3 grade and recovery rate of 79.13% and 57.81%, respectively, in addition to a potential feed for the production of quartz sand and feldspar concentrates.

15

Uzwojenia nadprzewodnikowe

Wojtasiewicz Grzegorz

Inżynieria Elektryczna

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2021

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nr 7

18--21

PL

W Łukasiewicz - Instytucie Elektrotechniki realizowano prace nad wykorzystaniem niskotemperaturowych cewek nadprzewodnikowych w procesie magnetycznej separacji, a obecnie prowadzone są prace nad konstrukcją różnych uzwojeń nadprzewodnikowych do ograniczników, transformatorów, magazynów energii z wysokotemperaturowych taśm nadprzewodnikowych. Stąd też zagadnieniu rozwoju tematyki uzwojeń nadprzewodnikowych, zgodnego z profilem Instytutu, poświęcony jest niniejszy artykuł.

16

Wpływ wartości indukcji magnetycznej na efektywność pracy wysokogradientowego separatora magnetycznego HGMS

Cieśla Antoni

Przegląd Elektrotechniczny

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2020

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R. 96, nr 2

30--35

PL

Przedmiotem rozważań pracy jest jedno z rozwiązań konstrukcyjnych magnetycznych separatorów wysokogradientowych jakim jest separator matrycowy. W polu magnetycznym generowanym przez nadprzewodzące uzwojenie o konstrukcji osiowo - symetrycznej (solenoid) znajduje się matryca (kanister wypełniony elementami gradientotwórczymi w postaci wiórek lub waty ferromagnetycznej), w której zachodzi proces ekstrakcji cząstek z zawiesiny przepływającej przez separator. Wysokogradientowy separator matrycowy (HGMS) pracuje cyklicznie: po okresie napełnienia matrycy produktem magnetycznym (efektywny czas pracy separatora), następuje okres czyszczenia matrycy, tzn. przywracanie jej zdolności akumulacyjnych (czas martwy). Proces technologiczny jest efektywny, jeśli czas napełniania matrycy jest długi, zaś czas martwy - krótki. Wydłużenie czasu efektywnego możliwe jest m. in. poprzez stosowanie pól magnetycznych o dużych wartościach indukcji magnetycznej.

EN

The subject of deliberation in this paper is one of the constructional solutions of high gradient magnetic separators, which is a matrix separator. In the magnetic field generated by the superconducting winding of the axial-symmetric construction (solenoid), there is a matrix (a canister filled with gradient forming elements in the form of chips or ferromagnetic steel wool), in which the process of extracting particles from the slurry flowing through the separator takes place. The high gradient matrix separator (HGMS) works cyclically: filling the matrix with a magnetic product (effective operation time), is followed by period of matrix cleaning, i.e. restoring its storage capacity (still time). The technological process is effective if the time of filling the matrix is long and still time is short. Prolonging the effective time is possible, through e.g. application of magnetic fields with high values of magnetic induction.

17

A novel process for extraction of iron from a refractory red mud

Ding Wei, Xiao Junhui, Peng Yang, Shen Siyue, Chen Tao, Zou Kai, Wang Zhen

Physicochemical Problems of Mineral Processing

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2020

|

Vol. 56, iss. 6

125--136

EN

Red mud is a kind of solid waste produced during alumina extraction from bauxite. To extraction valuable iron from red mud, the technology of adding sodium sulfate-segregation roasting-magnetic separation to treat red mud was developed. During the paper, the effects of various process parameters on the extraction of iron by segregation roasting-magnetic separation were studied, and the phase transformation behavior and microstructure of iron are explored. Repeated test results showed that magnetic concentrate (mass percent), TFe of 80.29 % and overall iron recovery of 92.08 %was obtained. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) results indicated that after the segregation roasting, the hematite was transformed into a new metal phase consisting mainly of metallic iron and magnetite. The addition of sodium sulfate during the segregation roasting can obviously improve the efficiency of segregation roasting-magnetic separation for iron extraction.

18

Possibilities of Siderite and Barite Concentrates Preparation from Tailings of Settling Pit Nearby Markušovce Village (Eastern Slovakia)

Hredzak Slavomir, Dolinska Silvia, Znamenackova Ingrid, Lovas Michal, Sestinova Olga

Inżynieria Mineralna

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2019

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R. 21, nr 1

19--24

EN

The contribution deals with recovery of useful minerals such as siderite and barite from tailings collected in settling pit nearby Markušovce village (East Slovakia). The material form the pit was subjected to gravity pre-concentration and magnetic separation under laboratory conditions with the aim to verify a possibility of siderite and barite concentrates preparation. A fraction of +0.2–1 mm forming a 40.56 wt% of total grain size scale of the material from the pit and containing 35.71% SiO2, 22.55% Fe2O3, 7,12% Al2O3, 5.48% Ba, and 3.89% SO42– was tested in upgrading process. Thus, 78.18% of SiO2, and 60.41% of Al2O3 at loss 21.70% Fe2O3 and 2.09% of Ba were removed in gravity pre-concentration. The iron concentrate with the content of 44.33% Fe2O3 at Fe recovery of 77.29% in magnetic product was obtained. Barite pre-concentrate with the Ba content of 46.21% at Ba recovery of 91.95% in non-magnetic product was won.

PL

Artykuł dotyczy możliwości odzysku minerałów użytecznych takich jak syderyt i baryt z odpadów zdeponowanych osadniku w pobliżu miejscowości Markušovce (Słowacja Wschodnia). Materiał z odwiertu poddano wstępnemu wzbogacaniu grawitacyjnemu i separacji magnetycznej w warunkach laboratoryjnych w celu weryfikacji możliwości uzyskania koncentratów syderytu i barytu. Klasa ziarnowa 0,2-1 mm ma wychód 40,56% wagowo i zawartość 35,71% SiO2, 22,55% Fe2O3, 7,12% Al2O3, 5,48% Ba i 3,89% SO42- była poddana wzbogacaniu. Uzyskano koncentrat o uzysku 78,18% SiO2 i 60,41% Al2O3 . We wstępnym wzbogacaniu grawi- tacyjnym usunięto 21,70% Fe2O3 i 2,09% Ba w stężeniu grawitacyjnym. Otrzymano koncentrat żelaza o zawartości 44,33% Fe2O3 przy uzysku Fe 77,29% w produkcie magnetycznym. Uzyskano koncentrat wstępny (produkt niemagnetyczny) barytu o zawartości Ba 46,21% i uzysku 91,95%.

19

Micaceous iron oxide production by application of magnetic separation

Tanriverdi M., Sen S., Ciçek T.

Physicochemical Problems of Mineral Processing

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2018

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Vol. 54, iss. 2

546--553

EN

In this study, different flowsheet options were evaluated to achieve the best upgrading conditions for a micaceous iron oxide ore. The first option included the recovery of micaceous iron oxide particles using a double stage magnetic separation circuit after the grinding and classifying of the ore into coarse (-1000+106 μm) and fine (-106 μm) size fractions. A belt type dry high gradient magnetic separator (BHGMS) was used to beneficiate the coarse fraction. The concentrate of the BHGMS was ground to -106 μm, and combined with the fine fraction produced at screening stage, and subjected to high gradient magnetic separation (HGMS) at 1.2 T. A concentrate grading about 61.33% Fe with 60.3% recovery was obtained applying the separation process incorporating BHGMS and HGMS. A single stage separation circuit considering the use of HGMS after the grinding the ore below 106 μm was employed as the second concentration option. A concentrate having 63.80% Fe with 37.1% weight recovery was obtained in this test. As the highest Fe grade and the lowest S concentration was obtained by application of HGMS after the grinding the ore below 106 μm, and it was decided to conduct a pilot scale study using pulsating HGMS. A concentrate assaying 69.45% Fe with 60.1% weight recovery was produced by operating the pulsating HGMS at 0.6 T. The results showed that it was possible to obtain a micaceous iron oxide concentrate to be used in pigment production using magnetic separation method.

20

An innovative methodology for recycling iron from magnetic preconcentrate of an iron ore tailing

Yu J., Han Y., Gao P., Li Y., Yuan S., Li W.

Physicochemical Problems of Mineral Processing

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2018

|

Vol. 54, iss. 3

668--676

EN

Iron ore tailing is a kind of hazardous solid waste produced by iron and steel industry. In order to separate and recycle iron from the magnetic preconcentrate of an iron ore tailing, an innovative technological route of fluidized magnetization roasting followed by low-intensity magnetic separation was proposed in this paper. The effects of roasting temperature, dosages of reducing gas CO and fluidizing gas N2 on recovery rate of iron were carried out and optimized. The results showed that the hematite was almost reduced to magnetite by a gas mixture of 4 m3/h CO and 1 m3/h N2 at roasting temperature of 540 °C. Under the optimized conditions, a magnetic concentrate assaying 61.4 wt% Fe with a recovery rate of 81.8% was obtained from the magnetic preconcentrate of an iron ore tailing. The iron chemical phase, X-ray diffraction (XRD), and optical metallographic microscope analyses revealed that siderite was converted to magnetite successfully after roasting, and some coarse magnetite-hematite interlocking particles were formed due to insufficient reaction time, which could also be recovered by magnetic separation after liberating from gangue minerals.