Wyniki wyszukiwania - BazTech

1

Removal of silver from chloride solutions using new polymer materials

Pilśniak-Rabiega Magdalena, Wolska Joanna

Physicochemical Problems of Mineral Processing

|

2023

|

Vol. 59, iss. 6

art. no. 174357

EN

This work presents the synthesis of polymer resins with heterocyclic functional groups, that is, N-(3-aminopropyl)-2-pipecoline, N-(3-aminopropyl)-2-pyrrolidinone, and trans-1,4-diaminocyclohexane for the recovery of Ag(I) from chloride solutions. The modification yield was 69.2, 74.6 and 88.3%, respectively. The best Ag(I) sorption was achieved from synthetic and real chloride solutions in the case of trans-1,4-diaminocyclohexane resin (sorption was 26.8 and 21.5 mg/g, respectively). The sorption kinetic data were well fitted to the pseudo-first-order kinetic model. The maximum sorption capacity of Ag(I) is 105.4, 117.8 and 130.7 mg Ag(I)/g for N-(3-aminopropyl)-2-pipecoline resin, N-(3-aminopropyl)-2-pyrrolidinone resin and trans-1,4-diaminocyclohexane resin, respectively. The trans-1,4-diaminocyclohexane modified resin was very selective towards Ag(I) compared to Cu(II), Pb(II), and Zn(II) from the real chloride leaching solution. The N-(3-aminopropyl)-2-pipecoline and N-(3-aminopropyl)-2-pyrrolidinone resins showed high preferences for Ag(I) over Pb(II) in real solution. These results indicated that the polymers can be applied in the recovery of Ag(I).

2

Determining the Efficiency of Reverse Osmosis in the Purification of Water from Phosphates

Gomelya Mykola, Shabliy Tetyana, Radovenchyk Iaroslav, Vakulenko Anna

Journal of Ecological Engineering

|

2023

|

Vol. 24, nr 2

238--246

EN

Processes of water purification from phosphates using a low-pressure reverse osmosis membrane were studied. It was shown that the concentration of phosphates in the permeate largely depends on their initial concentration in the water and increases along with the degree of permeate selection. It was established that when using the Filmtec TW3–1812–50 membrane for phosphate concentrations up to 20 mg/dm3, their concentration in the permeate does not exceed 2.5 mg/dm3 with a degree of permeate selection up to 90% when cleaning solutions in distilled and artesian water. This value is below the permissible level for drinking water. When the concentration of phosphates increases to 100 and 1000 mg/dm3, their content in the permeate increases sharply to the values significantly higher than the permissible level in both drinking and wastewater. When sodium orthophosphate was added to artesian water, the effectiveness of its purification on this membrane with respect to chlorides, sulfates, hardness ions, and hydrocarbons was high. This indicates that the cartridges with these membranes can be used both in industrial installations and in households for further purification of artesian and tap water to drinking water quality.

3

Weryfikacja zabezpieczeń nadprądowych w mikrosieci AC niskiego napięcia pod kątem dostosowania jej do pracy w trybie off-grid

Sobolewski Robert A., Lis Robert

Wiadomości Elektrotechniczne

|

2022

|

R. 90, nr 5

20--24

PL

Artykuł przedstawia metodykę weryfikacji zabezpieczeń nadprądowych w mikrosieci niskiego napięcia pod kątem dostosowania jej do pracy w trybie wyspowym. Metodyka umożliwia sprawdzenie skuteczności ochrony przeciwporażeniowej i selektywności działania zabezpieczeń. Jest ona pokazana na przykładzie mikrosieci o topologii zakładającej przyłączenie lokalnych źródeł energii i magazynu energii do szyn stacji, która zasila odbiorców na wybranym obszarze.

EN

The paper presents the methodology of protection verification in terms of adopting the low-voltage microgrid to island operation. The methodology enables the checking of effectiveness of protection against electric shock and selectivity of protection operation. The whole process of verification is shown relying on case study of the microgrid which topology assumes both local power sources and storage energy equipment interconnection with the substation supplying the customers in particular area.

4

Zastosowanie cyklodekstryn w technologii wdrukowania molekularnego

Pokajewicz Katarzyna, Poliwoda Anna, Wieczorek Piotr P.

Wiadomości Chemiczne

|

2022

|

[Z] 76, 7-8

677--699

EN

In the last decade molecular imprinted polymers (MIP) have gained great interest in the area of selective recognition various type substances. Scientific work in this field is carried out very intensively - the methods of synthesis are modified and improved, new types of hydride materials are created, as well as new reagents for synthesis. In this case, cyclodextrins (CD) and their analogues show good molecular recognition ability for its unique physical and chemical properties and suitable cavity structure. As a result, these supramolecular ligands can perform various functions in the MIP technology, and the resulting polymeric materials are characterized by high selectivity and binding specificity (recognition) of analytes structurally matched to the MIP cavity. Of particular importance is the fact that cyclodextrins enable the imprinting not only of low-molecular-weight biologically active compounds, but also of high-molecular molecules (proteins, peptides). The numerous hydroxyl groups available in cyclodextrins are active sites that can form different types of linkages. They can be cross-linked with one another, or they can be derivatized to produce monomers that can form linear or branched networks. This article provides a detailed review of MIPs based on CD and their application in the field of separation science and analytical chemistry in recent years. The discussion is grouped according to the different role of CD in MIPs, that is, functional monomer, carrier modifier, etc.

5

Silver(I) recovery on thiomorpholine - modified functional polymer

Pilśniak-Rabiega Magdalena, Wolska Joanna

Physicochemical Problems of Mineral Processing

|

2022

|

Vol. 58, iss. 6

art. no. 156609

EN

The functional polymer containing heterocyclic ligands was synthesized by microwave modification of a crosslinked poly(vinylbenzyl chloride–divinylbenzene) matrix with thiomorpholine. The modification yield was 89.3%. The sorbent was used to recover Ag(I) from the synthetic and real chloride solutions. The maximum sorption capacity of Ag(I) was approximately 180 mg Ag/g. The sorption kinetic data were well-fitted to the pseudo-first-order kinetic model. The degree of silver desorption was approximately 50.0% using a 1.0% potassium cyanide solution in a 0.50% hydrogen peroxide solution. The resin retained its capacity toward Ag(I) in five consecutive sorption/desorption cycles. The thiomorpholine modified resin was highly selective toward Ag(I) in relation to Cu(II), Pb(II), Co(II), Ni(II), and Zn(II) from the real chloride leaching solution.

6

Revisiting flotation mechanisms of the selective separation of alkali feldspars in the presence of NaCl

Karagüzel Cengiz, Çelik Mehmet Sabri

Physicochemical Problems of Mineral Processing

|

2022

|

Vol. 58, iss. 5

art. no. 149928

EN

Selective separation of Na-feldspar (NaAl3SiO8) from K-feldspar (KAl3SiO8) by flotation appears to be the only alternative in commonly found mixed-type ore formations. For this purpose, various mechanisms in various studies have been proposed by which selective separation can be achieved in the presence of salt ions. These mechanisms under different flotation conditions are systematically discussed in this study. Literature review reveals that two adsorption mechanisms are operating in the presence of Na+ ions and natural pH: Ion exchange and ion adsorption. In mixed feldspar systems, the mineral surface properties change due to ion exchange of counter ions on K-feldspar surface and become suitable for amine adsorption, while Na-feldspar surface is suppressed due to co-ion adsorption leading to limited amine adsorption. Similar mechanisms occur in acidic conditions with fluorine ions which increases the dispersion of particles and provides selectivity for K-feldspar by forming AlSiF-amine complexes. K-feldspar at alkaline pH with NaOH is activated with fluorine ions at the previous flotation stages and then floated with amine releasing K ions into the solution. The ion exchange/ion adsorption mechanism seems effective in alkaline as well as in natural and acidic conditions.

7

Efficiency of Reverse Osmosis and Ion Exchange in Water Purification from Nitrates

Gomelya Mykola, Shabliy Tetyana, Makarenko Iryna, Vakulenko Anna

Journal of Ecological Engineering

|

2022

|

Vol. 23, nr 10

172--180

EN

The process of extracting nitrates from water by the methods of reverse osmosis and ion exchange was investigated in the paper. In the formation of reverse osmosis, low-pressure membranes were used, and in ion-exchange processes, highly alkaline anionite AB–17–8 was applied in salt form. The dynamics of changes in the concentration of nitrates in the permeate and the concentration with an increase in the degree of permeate selection from 9 to 90% at initial nitrate concentrations of 18, 50 and 100 mg/dm3 were determined. The indicators of selectivity and productivity of membranes were calculated depending on the degree of permeate selection. It was shown that the low-pressure reverse osmosis membrane is characterized by low selectivity values at high productivity values in the selected part of the nitrate concentration. It was established that the ion exchange method is significantly more effective than reverse osmosis in removing nitrates from water. It ensures the reduction of nitrate content in purified water to a value of less than 1 mg/dm3 when the degree of their extraction is reached at the level of 99%. As the ionite is saturated with nitrates, the efficiency of their extraction decreases. Anionite sorbs nitrates effectively enough, being both in the chloride mixture and in the sulfate form. Nitrates are effectively desorbed by 2H solutions of sodium chloride and sodium or ammonium sulfate.

8

Development of Resource-Saving Technologies in the Use of Sedimentation Inhibitors for Reverse Osmosis Installations

Trus Inna, Gomelya Mukola, Skiba Margarita, Pylypenko Tetiana, Krysenko Tamara

Journal of Ecological Engineering

|

2022

|

Vol. 23, nr 1

206--215

EN

The processes of desalination of weakly mineralized waters using a reverse osmosis membrane were studied. The operational efficiency of membranes is limited mainly by membrane contamination. It was shown that the preliminary mechanical water purification helps to increase the productivity and selectivity of the membrane. One of the main causes of membrane contamination is the formation of carbonate deposits on their surface. One way to prevent membrane contamination is to dose antiscalants. It was established that the use of hydrolyzed polyacrylonitrile (HPAN) and hydrolyzed polyacrylamide (HPAA) as a stabilizer of scale formation is effective for concentrates of reverse osmosis desalination of water.

9

Development of Renewable Material Hydrochar-Based CaAl Layered Double Hydroxide to Overcome Methyl Red Dyes Contaminant

Mohadi Risfidian, Juleanti Novie, Palapa Neza Rahayu, Hidayati Nurlisa, Lesbani Aldes

Journal of Ecological Engineering

|

2022

|

Vol. 23, nr 3

17--25

EN

The preparation of the CaAl/HC composite was carried out with a supporting material in the form of hydrochar from duku skin. The success of the preparation was demonstrated by XRD, FT-IR, and BET analysis. The diffractogram of CaAl/HC showed diffraction peaks at 2θ = 10.16° (003), 18.0° (002), 20.15° (006) and 65.4° (110). The diffraction showed similarity to diffraction in CaAl and hydrochar double layer hydroxyl. The FT-IR spectrum of CaAl/HC also showed similarity to the CaAl/HC double layer hydroxyl at 3448, 1635, and 1381 cm-1. The characteristic spectrum of the hydrochar also appeared in CaAl/HC at 20.15. BET analysis showed an increase in the surface area of CaAl/HC before modification of 11.842 m2/g and increased to 22.635 m2/g of CaAl/HC. The ability of CaAl/HC as an adsorbent is determined through several parameters including selectivity, regeneration, isotherm, and thermodynamics. The results of dye selectivity showed that CaAl/HC was more likely to absorb MR dyes in a mixture of dyes (DG, MO, PR, MR, CR, and DR). The regeneration results showed the ability of CaAl/HC which lasted up to 73.26% in the fifth cycle.

10

Novel functional polymers for recovery of silver

Pilśniak-Rabiega Magdalena, Wolska Joanna

Physicochemical Problems of Mineral Processing

|

2021

|

Vol. 57, iss. 6

36--54

EN

In this study, the functional polymers containing heterocyclic ligands were synthesized by microwave modification of a crosslinked poly(vinylbenzyl chloride–divinylbenzene) matrix with 4-tertbutylpyridine, pyrrolidine, and 3-morpholinopropylamine. The sorbents were used to recover Ag(I) from the synthetic and real chloride solutions (4.00 mol/dm3 of NaCl, 0.100 mol/dm3 of HCl). The best Ag(I) sorption was achieved from synthetic and real chloride solutions in the case of pyrrolidine resin (16.2 and 16.7 mg/g, respectively). The sorption kinetic data were well fitted to the pseudo-first-order kinetic model. The degree of silver desorption was approximately 90% using a 1.0% potassium cyanide solution in a 0.50% hydrogen peroxide solution. All resins showed good selectivity for Ag(I) compared to Cu(II), Pb(II), Co(II), Ni(II), and Zn(II) in real chloride solution. On the basis of this study, it can be concluded that the obtained sorbents can be used to recover Ag from various sources such as ores, wastewater, and jewelry scraps.

11

Competitive Removal of Cationic Dye Using NiAl-LDH Modified with Hydrochar

Normah, Palapa Neza Rahayu, Taher Tarmizi, Mohadi Risfidian, Arsyad Fitri Suryani, Priambodo Aldi, Lesbani Aldes

Ecological Engineering & Environmental Technology

|

2021

|

Vol. 22, iss. 4

124--135

EN

In this study, NiAl-LDH was modified with hydrochar using the NiAl-Hydrochar composite coprecipitation method. Materials were characterized by XRD and FT-IR analysis. XRD diffractogram and FT-IR spectra show that the NiAl-Hydrochar composite material has the characteristics of the precursors. NiAl- Hydrochar composite materials have a large adsorption capacity to adsorb cationic dyes. The adsorption follows the Langmuir adsorption isotherm model with the maximum capacity (Qmax) of the NiAl-Hydrochar composite material reaching 256.410 mg/g for malachite green and the adsorption process takes place spontaneously and endothermically. The regeneration process of NiAl-Hydrochar composites was more stable and the decrease was not significant (>70%). The selectivity of the dye mixture showed that the adsorbent was more selective for malachite green dye compared to methylene blue and rhodamine-B.

12

Badanie zwarcia w linii dwutorowej z uwzględnieniem impedancji wzajemnej

Pikisch Moritz, Luxenburger Rainer

Wiadomości Elektrotechniczne

|

2020

|

R. 88, nr 6

42--48

PL

W artykule zbadano zagadnienie zwarcia w linii dwutorowej z nieselektywnym działaniem związanym z nastawami przekaźnika opartymi na niedokładnej/niewystarczającej znajomości impedancji linii. Analiza zwarcia oparta jest na zmierzonych impedancjach linii i symulacji/testach systemowych wykonywanych za pomocą oprogramowania RelaySimTest. Przyjęto i udokumentowano odpowiednią procedurę pomiaru impedancji linii w liniach dwutorowych w możliwie najmniej inwazyjny sposób.

EN

This paper investigates a double-circuit line fault with non-selective tripping caused by the parameterization of the relay based on inaccurate/insufficient knowledge of the line impedances. Analysis of the fault is based on the measured line impedances and the simulation/system-based testing using RelaySimTest. An appropriate procedure was adopted and documented to measure the line impedances of double-circuit lines in a minimally invasive manner.

13

Optimization strategies of container terminals

Kuznetsov Alexander L., Kirichenko Alexander V., Semenov Anton D., Borevich Albert Z.

Scientific Journal of Gdynia Maritime University

|

2020

|

nr 115

42--54

EN

One of the main tasks of operational management of modern container terminals is effective utilization of existing technological resources. The search for possible variants of terminal activity optimization requires constant analysis of transport process technology and development of technical and technological approaches to increase the effectiveness of resources utilization. One of the possible solutions provided by terminal operational systems is the application of different strategies of container stack organization and container selectivity. At the same time, the complicated character of input and output container flow makes the effectiveness of these strategies doubtful. The paper states that this particular manner of container service is different from traditional ones, i.e. FIFO and FILO. As output container flow is randomly distributed the manner of container service can be considered as First In/Random Out. The paper also considers different strategies that are applied in practice and analyzes its influence on the productivity of handling equipment. The results of these strategies simulation modeling are represented. The results prove that no strategy can provide a productivity with theoretical selectivity; any strategy provides slowed intensity of operations. At the same time, it is proved that the only optimization strategy which increases the productivity of handling equipment is the organization of terminal activity whereby containers can be selected from the stack not in requirement sequence, but in order of its position in a stack.

14

Silver(I) recovery on sulfur-containing polymeric sorbents from chloride solutions

Pilśniak-Rabiega Magdalena, Wolska Joanna

Physicochemical Problems of Mineral Processing

|

2020

|

Vol. 56, iss. 6

290--310

EN

This work describes the preparation of functional polymers containing 2-mercapto-1-methylimidazole and guanylthiourea ligands from chemically modified vinylbenzyl chloride/divinylbenzene copolymer (VBC/DVB). The resins were used for the removal of Ag(I) from synthetic and real chloride solutions. The 2-mercapto-1-methylimidazole resin was highly selective towards Ag(I) in relation to Pb(II) from real chloride leaching solution. The resins were selective for Ag(I) from real chloride solution and they did not sorb chloride complexes of Co(II), Ni(II) and Zn(II). The sorption kinetic data were well fitted to the pseudo-first-order kinetic model. The degree of Ag(I) desorption was about 80% using 1% potassium cyanide solution in 0.5% hydrogen peroxide solution. Resins retain their capacity towards Ag(I) in five consecutive sorption/desorption cycles.

15

Katalizatory palladowe immobilizowane w materiałach typu MOF aktywne w reakcjach uwodornienia

Augustyniak Adam W., Trzeciak Anna M.

Wiadomości Chemiczne

|

2019

|

[Z] 73, 3-4

221--241

EN

Palladium immobilized in metal-organic frameworks (MOF) exhibit promising catalytic properties in hydrogenation of different unsaturated substrates. Due to the specific porous and crystalline structure MOFs can contribute in bonding and activation of organic substrates, increasing catalytic efficiency of Pd@MOF composites. The superior tunability of MOFs structures enables to design highly selective catalysts for hydrogenation of different substrates, such as olefins, esters, ketones, alcohols or alkynes. Due to the synergistic effects of palladium and MOF not only high activity but also high selectivity can be achieved. The article presents representative examples of MOF-based palladium catalysts for hydrogenation to illustrate perspectives, also technological, of their application.

16

Poprawa selektywności i dynamiki działania zabezpieczeń przemysłowych sieci średniego napięcia przez stosowanie kryterium różnicowego

Dołowy J., Lizer M.

Wiadomości Elektrotechniczne

|

2018

|

R. 86, nr 12

20--25

PL

W artykule przedstawiono możliwości poprawy selektywności i szybkości wykrywania zwarć w sieciach przemysłowych z wewnętrzną generacją na przykładzie zastosowania sterownika polowego SIPROTEC 7SD82 firmy Siemens.

EN

The article presents the possibilities of improving the selectivity and speed of short circuits detection in industrial MV networks with an internal generation on the example of use of Siemens SIPROTEC 7SD82 bay control unit.

17

Evaluation of flotation reagents by normalization procedures

Drzymala J.

Physicochemical Problems of Mineral Processing

|

2018

|

Vol. 54, iss. 1

182--192

EN

Froth flotation is a dynamic multiphase process in which particulate matter is separated with the help of chemical reagents by gas bubbles immersed in water. The original flotation results are usually presented in the form of kinetic curves relating recovered particulate matter mass (yield ) or mass of a selected component (recovery ), both shortly denoted as y, versus process time t at different concentrations c (g/dm3) of the applied reagents. The kinetic curves can be modified into three: incentive (maximum yield or recovery ymax vs c), limits (ymax vs kinetic constant k or specific rate) and half-life of flotation (t1/2 vs c) curves. The original and modified curves can be normalized by taking into account either an external parameter such as molecular mass (MW), critical coalesce concentration (CCC), critical concentration at the minimum bubble velocity (CMV), dynamic foaming index (DFI), and many other parameters or an internal parameter such as time, concentration needed to achieve certain yield, recovery (y) or kinetic constant. Normalization leads to new flotation curves and provides additional useful information about flotation performance. Normalization can be fully effective, partial or ineffective. Normalization of the original flotation kinetic curves usually is ineffective. Also, normalization of the incentive curve with external parameters such as frother molecular mass, which changes reagent concentration from c (g/dm3) to C (mol/dm3), is also ineffective. Partially effective are normalizations with other external parameters such as CCC and CMV, usually within the same class of regents, for instance alcohols. Only DFI seems to be a universal external normalization parameter for flotation results because it provides fully effective normalization and thus predicts the flotation results. Limited data on DFI restrict a full verification of this hypothesis. Normalization of the modified flotation curves with internal parameters such as k50 (value of 1st order kinetic constant when recovery or yield is 50% after a given flotation time), Ct1/2 (frother concentration in mol/dm3 at which the flotation half-life has an arbitrarily chosen value) and cy75 (frother concentration in g/dm3 at which recovery or yield is 75% after a given flotation time) is a good base for practical classification of flotation reagents.

18

Chromatograficzna analiza związków budujących kwasy nukleinowe

Studzińska S., Rola R., Łobodziński F., Krzemińska K.

Wiadomości Chemiczne

|

2016

|

[Z] 70, 9-10

633--656

EN

Understanding the characteristics, role and structure of nucleic acids allowed to answer questions about the disease processes. Today, nucleic acids and their constituents are tools, which are used by molecular biology in medicine and biotechnology. Antisense and gene therapy are intensively developing methods for possible treating or preventing disease. They use short fragments of DNA or RNA - oligonucleotides to silence the genes expression. They are not the only ones that allow analytical chemists to obtain information about the state of our body. Determination of modified nucleoside allows detection of cancer, while analysis of nucleotides allows the estimation of strengthening the immune system. There is a great need of sensitive, selective and precise methods of separation of nucleosides, nucleotides and oligonucleotides and their qualitative and quantitative analysis. Consequently liquid chromatography (LC) is the most commonly used for analysis of nucleic acid constituents. The most widely used modes of LC include Ion Exchange Chromatography (IEC) and Reversed Phase High Performance Liquid Chromatography (RP HPLC). Both techniques have their advantages and disadvantages in the analysis of nucleosides, nucleotides and oligonucleotides. In the case of IEC it is necessary to use high concentrations of the salt in the mobile phase or concentration gradients, which considerably limits the possibility of using MS detection. RP HPLC can be coupled with MS detection but only when volatile salts are mobile phase components. On the other hand there is a significant problem is the lack of sufficient selectivity for the most polar nucleosides and nucleotides. RP HPLC MS is still most often used in the determination of nucleosides and nucleotides, due to its high sensitivity and a comprehensive qualitative analysis. Another system used for the HPLC analysis of oligonucleotides is Ion Pair Reversed Phase High Performance Liquid Chromatography (IP RP HPLC). These compounds can not be analyzed by RP HPLC due to their high polarity. The advantage of IP RP HPLC is selectivity, achieved by a suitable choice of mobile phase composition and the possibility of using MS. A disadvantage of IP RP HPLC in the analysis of oligonucleotides is however lower sensitivity compared to RP HPLC. During the last few years Hydrophilic Interaction Liquid Chromatography (HILIC) was applied for the separation of mixtures of nucleosides, nucleotides, oligonucleotides extracted from a biological or food samples. The presented results demonstrate the usefulness of this method, however, the resolving power is limited due to the asymmetric peak shape. On the other hand proper selection of the mobile and stationary phase can lead to a high selectivity in the analysis of the most polar nucleosides, nucleotides and oligonucleotides, which can not be separated by RP HPLC.

19

Porównanie selektywności wzbogacania w ołów w układzie technologicznym flotacji rudy miedzi w ZWR Lubin Ołów

Duchnowska M., Bakalarz A., Kowalczuk P. B., Drzymała J., Łuszczkiewicz A., Muszer A.

Rudy i Metale Nieżelazne Recykling

|

2016

|

R. 61, nr 7

289--293

PL

Ołów jest jednym z głównych składników towarzyszących obecnych w polimetalicznych rudach miedzi z Monokliny Przedsudeckiej. Ruda wydobywana w rejonie kopalni Lubin obecnie charakteryzuje się stosunkiem zawartości Cu do Pb jak 2: 1, co oznacza, że jest to ruda miedziowo-ołowiowa. Nośnikami miedzi w tej rudzie są bornit, chalkopiryt i w mniejszym stopniu chalkozyn, a nośnikiem ołowiu jest galena. Technologia flotacji w ZWR Lubin ma charakter kolektywny. W układzie technologicznym tego zakładu skruszona nadawa rozdzielana jest na 2 strumienie: rudy łupkowo-węglanowej oraz piaskowcowej. W pracy porównano selektywność flotacyjnego wzbogacania w ołów w obu strumieniach rudy. Na podstawie krzywych wzbogacania stwierdzono, że w przypadku flotacji rudy piaskowcowej galena flotowała z wyższą selektywnością niż we flotacji rudy łupkowo-węglanowej. Stwierdzono, że koncentraty flotacji głównej frakcji piaskowcowej charakteryzują się zbliżoną zawartością ołowiu do zawartości tego metalu w koncentratach ostatecznych z ZWR Lubin. Pomimo wysokiej selektywności wzbogacania w ołów we flotacji głównej piasków, znacząca ilość tego metalu koncentruje się w układzie flotacji łupkowo-węglanowej. Analizy mineralogiczne wykazały, że galena charakteryzuje się nieznacznie drobniejszym uziarnieniem oraz znacząco wyższym stopniem uwolnienia we flotacji głównej piasków w porównaniu ze strumieniem flotacji głównej łupkowo-węglanowej.

XX

Lead is one of the main accompanying components of po/ymetal/ic copper ore from the Kupferschiefer deposit located in SW Poland. The ratio of copper-to-lead content in the ore mined in the Lubin area is 2:7, this means that it is a Cu-Pb ore. The main copper-bearing minerals in the ore are bornite, chalcopyrite, and to a lesser extent, cha/cocite, while galena is the main lead-bearing mineral. The flotation at Lubin Concentrator (KGHM Polska M/edz 5.AJ consists of two independent streams of ore processing, that is shale-dolomitic and sandstone circuits. In this work selectivity of lead-bearing minerals flotation in two circuits was compared. The comparison was based on upgrading curves. The results showed that flotation selectivity of galena in the concentrate of the sandstone circuit was higher than that in the shale-dolomitic stream, while the most of this mineral is processed in the shale-dolomitic circuit The content of lead in the concentrate of rougher flotation of sandstone circuit was similar to the content of lead in the final concentrate produced at Lubin Concentrator. Mineralogical analyses indicated that galena was finer and also better liberated in the sandstone circuit than in the shale-dolomite stream.

20

Flotation behavior of hard-to-separate and high-ash fine coal

Xing Y., Gui X., Liu J., Cao Y., Zhang Y., Li S.

Physicochemical Problems of Mineral Processing

|

2016

|

Vol. 52, iss. 2

703--717

EN

The flotation behavior of hard-to-separate and high-ash fine coal was investigated using conventional flotation with constant power input. A new flotation process, based on energy input and distribution, was designed to lower the ash content of concentrate. The results obtained using Fourier transform infrared (FTIR) analysis show that the coal samples have good floatability because of many hydrophobic and few hydrophilic functional groups. Under a constant power input, a large number of ash-forming materials floated into a froth product at the start of flotation. Based on the Fuerstenau upgrading curves, it was determined that the 0.25-0.074 mm size fraction range showed the worst selectivity when compared with 0.50-0.25 mm and -0.074 mm size fractions. The desired concentrate with an ash content of 13.98%, 27.59% of ash recovery, and 80.01% combustible matter recovery could be obtained by transferring the excess energy of the flotation-conditioning stage to the pre-conditioning stage and increasing the power input step-by-step in the flotation-conditioning stage at equal total energy consumption.