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  1. 20 Physicochemical Problems of Mineral Processing
  2. 3 Annual Set The Environment Protection
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  4. 3 Inżynieria i Aparatura Chemiczna
  5. 3 Polish Journal of Chemical Technology
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  1. 48 Sadowski Z.
  2. 21 Polowczyk I.
  3. 13 Bastrzyk A.
  4. 7 Koźlecki T.
  5. 7 Szubert A.
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1
Content available Surface properties of neutral components in copper column bioleaching of black shale samples
Sadowski Z., Baranska J., Pawlowska A.
Physicochemical Problems of Mineral Processing
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2018
|
Vol. 54, iss. 4
1146--1151
EN
The behaviour of glass beads and polyethylene pellets as the extra bacteria support in the fine black shale ore in the column bed bioreactor was compared. Capillary rise experiments enabled the calculation of the contact angle and the surface free energy of glass beads and polyethylene pellets. The results showed that the support material made up of polyethylene pellets yielded a higher copper extraction, which could be explained by conditions favourable to cell adhesion on the polyethylene surface.
2
Content available Influence of chemical and biogenic leaching on surface area and particle size of laterite ore
Pawlowska A., Sadowski Z.
Physicochemical Problems of Mineral Processing
|
2017
|
Vol. 53, iss. 2
869--877
EN
Currently there is a decline in the world’s nickel sulfide deposits, which are the main source of this metal. Due to the fact, that more than 70% of nickel reserves are in the form of oxide ores, more attention is nowadays paid on laterites. Leaching processes using different organic acids are widely described in the literature, but there is a lack of works linking influence of leaching process with the surface area and particle size distribution. Therefore, the main aim of this study was to examine how citric acid produced by microorganisms and citric acid added as chemical affected the specific surface and particle size distribution of mineral particles. The laterite ore was obtained from Szklary deposit, Poland. This study also compared the effect of chemical citric acid and filtrate after cultivation of Aspergillus niger on nickel extraction. It was observed that higher nickel recovery correspond to higher surface area of particles. The highest yield of nickel extraction was observed for a citric acid concentration of 1 mol/dm3 (67%). The specific surface area after leaching was 159 m2/g. An analysis of particle size distribution showed increase in the median particle size of particles after leaching with citric acid. It may suggest that dissolution of Polish laterites follows a shrinking core-shrinking particle model.
3
Content available Diophantine equation based model of data transmission errors caused by interference generated by DC-DC converters with deterministic modulation
Bojarski J., Smolenski R., Lezynski P., Sadowski Z.
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2016
|
Vol. 64, nr 3
575--580
EN
The assurance of the electromagnetic compatibility of sensitive smart metering systems and power electronic converters, which introduce high-level electromagnetic interference is important factor conditioning reliable operation of up to date power systems. Presented experimental results have shown that currently binding, frequency domain tests are ineffective for the evaluation of data transmission error hazards. The proposed in this paper mathematical, time-domain model, based on Diophantine equation, enables evaluation of data transmission errors caused by interference introduced by DC-DC power electronic interfaces with deterministic modulation. In the paper there have been presented possible application areas for the proposed model.
4
Content available Calcium carbonate mineralization. Part II: effect of poly(ethylene glycol) and block copolymers molecular weight on formation of precipitate
Polowczyk I., Bastrzyk A., Kozlecki T., Grzadka E., Sadowski Z.
Physicochemical Problems of Mineral Processing
|
2015
|
Vol. 51, iss. 2
587--600
EN
In this study the role of PEG and PEO-PPO-PEO block copolymers molecular weight in precipitation of calcium carbonate was examined. The CaCO3 particles were characterized by FTIR spectroscopy, X-ray, SEM and particle size distribution analysis. In absence and presence of modifiers, mixing of the reagents led to the formation of calcite crystals. The calcium carbonate obtained with poly(ethylene glycol) and block copolymers was characterized by smaller diameter in comparison with the one without modifiers. It was observed that using compounds with different molecular weights has no obvious effect on the form and properties of precipitated calcium carbonate particles.
5
Badania wpływu różnych dodatków na odzysk miedzi w procesie bioługowania rudy łupkowej w kolumnie
Barańska J., Sadowski Z.
Cuprum : czasopismo naukowo-techniczne górnictwa rud
|
2015
|
nr 2
147--156
PL
Bioługowanie rud na hałdzie stało się komercyjnym procesem, pozwalającym na odzysk metalu z ubogich surowców mineralnych. Proces bioługowania prowadzony na hałdzie jest uzależniony od czynników mikrobiologicznych, chemicznych i hydrodynamicznych. W pracy zostały przedstawione wyniki testów prowadzonych w kolumnie z upakowanym złożem, zawierającym rudę i dodatki. Ustalony został wpływ różnych dodatków (piryt, siarka, szkło i polietylen) na stopień odzysku miedzi z rudy łupkowej. Do badań zostały użyte bakterie Acidithiobacillus ferrooxidans, pochodzące z własnej kolekcji. Bakterie były hodowane na dwóch pożywkach – 2K i 9K. Surowcem użytym w badaniach był odpad z pierwszego czyszczenia, pochodzący z Zakładu Wzbogacania Rud Lubin. Materiał ten zawierał najwięcej minerałów wchodzących w skład rudy łupkowej. Doświadczenia przeprowadzono, stosując różne ilości dodatków do złoża rudy, znajdującej się w kolumnie. Badania wskazały na istotną rolę, jaką odgrywa immobilizacja (unieruchomienie) komórek bakteryjnych na powierzchni ciał stałych w procesie bioługowania. Określony został wpływ warunków hydrodynamicznych istniejących w porowatym złożu na odzysk miedzi. W optymalnych warunkach odzysk miedzi przekroczył 70% po 14 dniach prowadzenia procesu bioługowania.
EN
Heap bioleaching is a well establish commercial process for metal recovery from low-grade ores. Bioleaching process carried out in the heap is influenced by microbiological, chemical, and hydrodynamic factors. In this paper, the column tests data are presented. The effect of various additives (pyrite, sulphur, glass, and polyethylene) to the black ore on the copper recovery during the black shale bioleaching has been evaluated. For the bacteria growth two different media (2K and 9K) were used. The ore material selected for the bioleaching experiments was taken from the industrial flotation circuit (middlings from 1st cleaning) from Lubin Concentrator. The bioleaching tests were conducted with different amounts of additives which were added to the column packed with black shale ore. These experiments reveal that the microbial cells immobilization has an effect on the copper recovery. The role of hydrodynamic conditions in porous media is also described in the context of copper recovery. Under the optimal conditions, the extraction of copper was obtained more than 70% in 14 days, which is better than bioleaching without additives.
6
Content available Use of fly ash and fly ash agglomerates for As(III) adsorption from aqueous solution
Ulatowska J., Polowczyk I., Sawiński W., Bastrzyk A., Koźlecki T., Sadowski Z.
Polish Journal of Chemical Technology
|
2014
|
Vol. 16, nr 1
21--27
EN
The objective of the present study is to assess the efficiency of fly ash and fly ash agglomerates to remove arsenic(III) from aqueous solution. The maximum static uptakes were achieved to be 13.5 and 5.7 mgAs(III)/adsorbent for nonagglomerated material and agglomerated one, respectively. Isotherm studies showed good fit with the Langmuir (fly ash) and the Freundlich (fly ash agglomerates) isotherm models. Kinetic studies indicated that the sorption of arsenic on fly ash and its agglomerates follows the pseudo-second-order (PSO) chemisorption model (R2 = 0.999). Thermodynamic parameters revealed an endothermic nature of As(III) adsorption on such adsorbents. The adsorption results confirmed that fly ash and its agglomerates can be used for As(III) removal from aqueous solutions. Fly ash can adsorb more arsenic(III) than agglomerates, which are easier to use, because this material is less dusty and easier to separate from solution.
7
Content available Modelowanie matematyczne procesu perwaporacji roztworu woda-etanol z wykorzystaniem metod CFD oraz teorii Flory-Hugginsa
Pokomeda K., Dawiec A., Podstawczyk D., Witek-Krowiak A., Modelski S., Sadowski Z.
Inżynieria i Aparatura Chemiczna
|
2014
|
Nr 1
29--30
PL
Rozdział mieszaniny woda-etanol ma duże znaczenie dla wielu gałęzi przemysłu. Powszechnie stosowane techniki rozdziału tego układu posiadają szereg wad. Jedną z alternatyw jest proces perwaporacji. W celu upowszechnienia stosowalności perwaporacji podjęto próbę modelowania wspomnianego układu. W tym celu wykorzystano model Flory-Hugginsa, I prawo Ficka oraz metody CFD. Otrzymane wyniki pozwoliły ocenić wpływ polaryzacji na transport masy w perwaporacji.
EN
Separation of water-ethanol mixture is of great significance for many branches of industry. Separation techniques commonly used to separate above-mentioned mixture have many drawbacks. Pervaporation is one of alternatives. To make this process more applicable a mathematical model was created. The Flory-Huggins theory, first Fick's law and CFD methods were used in this model. Modeling results enable one to asses the influence of concentration polarization on mass transfer in pervaporation.
8
Content available Aglomeracja olejowa skały magnezytowej z udziałem mieszaniny jonowych surfaktantów
Bastrzyk A., Polowczyk I., Sadowski Z.
Rocznik Ochrona Środowiska
|
2013
|
Tom 15, cz. 2
1441--1459
EN
In this study, the adsorption of surfactant onto the magensite rock and the oil agglomeration of this mineral in aqueous suspension were investigated. The various concentration ratios of cationic and anionic surfactant were used. The results were evaluated by the recovery of carbonates in agglomerates. It was found that the process selectivity was highly dependent on the surfactants concentration ratio, pH, and the amount of salt added. The best separation of quartz from magnesite rock was observed at pH 9. The addition of larger quantity of sodium oleate (15.2 mg/gsolid) led to the increase of carbonates content in agglomerates up to 32.4%. However, the largest carbonates recovery was in the presence of 6.0 mg/gsolid of NaOl.
9
Content available Calcium carbonate mineralization. Part 1, The effect of poly(ethylene glycol) concentration on the formation of precipitate
Polowczyk I., Bastrzyk A., Kozlecki T., Sadowski Z.
Physicochemical Problems of Mineral Processing
|
2013
|
Vol. 49, iss. 2
631--639
EN
In this study, the role of polymer in precipitation has been examined by studying the effect of poly(ethylene glycol) (PEG) on the formation of calcium carbonate particles. The CaCO3 particles were characterized by several techniques, such as FTIR, XRD, SEM, and particle size distribution analysis. In the absence of polymer, the mixing of reagents in an aqueous solution led to the formation of calcite crystals. Introduction of poly(ethylene glycol) molecules reduced the rate of crystallization process, and the effect was concentration dependent. In the presence of 0.05, 0.1, and 0.5 % of PEG, after 5 minutes of precipitation initiation, vaterite microspheres appeared in the system and which were transformed into calcite crystals after 24 hours. The calcium carbonate obtained with PEG was characterized by smaller sized particles in comparison with the ones without polymer.
10
Content available Bioleaching of uranium minerals and biosynthesis of UO2 nanoparticles
Baranska J. A., Sadowski Z.
Physicochemical Problems of Mineral Processing
|
2013
|
Vol. 49, iss. 1
71--79
EN
Uranium mining has resulted in generation of significant amounts of solid wastes. The mecha-nism and chemical conditions of uranium waste bioleaching were considered. The initial results of bi-oleaching of solid waste from closed Kowary mine were presented. The process of U(VI) bioreduction by anaerobic reduction microorganisms was described. The factors that contributed to UO2 nanoparticles fabrication were discussed. The obtained UO2 particles are promising for development of novel catalysts.
11
Content available Optymalizacja bioprodukcji kwasu cytrynowego w hodowli wgłębnej Aspergillus niger prowadzonych w obecności Tweenu 80
Kałuża M., Sadowski Z.
Inżynieria i Aparatura Chemiczna
|
2013
|
Nr 4
332--333
PL
Celem badań była maksymalizacja bioprodukcji kwasu cytrynowego w wgłębnych hodowlach A. niger prowadzonych w obecności Tweenu 80. Przeprowadzono optymalizację składu podłoża hodowlanego i warunków procesu fermentacji cytrynowej, korzystając z metody zaproponowanej przez Boxa i Wilsona. Wynikiem eksperymentu optymalizacyjnego był wzrost stężenia kwasu cytrynowego w prowadzonych hodowlach z 47,01 do 66, 37 g/dm3 oraz obniżenie zawartości białego cukru w nowo zdefiniowanym podłożu fermentacyjnym.
EN
The aim of these experiments was to enhance the citric acid bioproduction in Aspergillus niger submerged cultures supplemented with Tween 80. To maximize the effect of citric acid fermentation, the optimization of culture medium and fermentation conditions was performed using a method proposed by Box and Wilson. The optimization result was the enhancement of citric acid concentration in fermentation broths from 47.01 to 66.37 g/dm3 and the reduction of sucrose in redefined fermentation medium.
12
Content available remote Flotation of serpentinite and quartz using biosurfactants
Didyk A. M., Sadowski Z.
Physicochemical Problems of Mineral Processing
|
2012
|
Vol. 48, iss. 2
607-618
EN
Biosurfactants produced by Bacillus circulans and Streptomyces sp. were used for biomodification of both serpentinite and quartz surfaces. The biosurfactants produced by bacteria possess the ability to decrease the surface tension of water from 72 to 28.6 mNm-1 (Bacillus circulans) and to 29.3 mNm-1 (Streptomyces sp.). This paper demonstrated biomodification of quartz and serpentinite surfaces by the biosurfactants adsorption. The effect of biosurfactants adsorption onto mineral surface properties was investigated by microflotation. Additionally, IR-ATR spectroscopy was used for characterisation of the biomodificated surfaces of quartz and serpentinite. Flotation experiments indicated that these biosurfactants effectively changed the properties of mineral surfaces and the separation of minerals can be realized.
13
Content available remote Adsorption and co-adsorption of PEO-PPO-PEO block copolymers and surfactants and their influence on zeta potential of magnesite and dolomite
Bastrzyk A., Polowczyk I., Szelag E., Sadowski Z.
Physicochemical Problems of Mineral Processing
|
2012
|
Vol. 48, iss. 1
281-293
EN
The influence of adsorption and co-adsorption of PEO-PPO-PEO triblock copolymers (Pluronics) as well as surfactants on the zeta potential of magnesite and dolomite aqueous suspension are addressed here. Four Pluronics of various molecular weight were used in these studies. They have been mixed with cationic (CTAB) or anionic (SDS) surfactants. The adsorption isotherms of copolymers and copolymer-surfactant mixture onto magnesite and dolomite have been determined. The adsorbed amount of Pluronics increases with the increasing concentration and reaches plateau. An increase in the adsorbed amounts of both cationic and anionic surfactants onto the mineral surfaces (magnesite and dolomite) has been observed in the presence of Pluronic copolymers. A positive nature of zeta potential was observed in the presence of cationic surfactant, except magnesite without or with a low CTAB concentration. However, an attendant copolymer causes a decrease of zeta potential due to the deformation of an electrical double layer, comparing the presence of an individual cationic surfactant. The adsorbed non-ionic Pluronic layer partially screens the surface charge of mineral particles, and thus, reduces the zeta potential. On the other hand, the adsorption of anionic surfactant and copolymer caused a decrease in the negative value of the zeta potential of both investigated minerals due to increased SDS adsorption. The viscosity measurements were also performed to determine the thickness of adsorbed layer.
14
Content available remote Wykorzystanie metod biotechnologicznych do otrzymywania nanocząstek metali
Maliszewska I., Sadowski Z., Skłodowska A., Leśkiewicz-Laudy A.
Polimery
|
2011
|
T. 56, nr 2
140-145
PL
Zbadano możliwość wykorzystania kosmopolitycznych pleśni z rodzaju Penicillium do zewnątrzkomórkowej syntezy nanostruktur srebra. Ocenie poddano kilkanaście pleśni wyizolowanych z naturalnego środowiska. Określono wpływ warunków reakcji, tj. wieku hodowli i stężenia biomasy na kształt, wymiary i stabilność uzyskiwanych nanocząsteczek, a także na przebieg biosyntezy. Tworzenie nanostruktur monitorowano wizualnie oraz za pomocą spektroskopii UV-VIS.
EN
Studies on the possibilities of the application of cosmopolitan moulds of the Penicillin group type for the extracellular synthesis of silver nanostructures have been presented. A number of moulds were isolated from their natural habitat and studied. The influence of reaction conditions such as the age of the cell culture and concentration of biomass on the structure, dimensions and stability of the obtained nanoparticles as well as on this biosynthesis process as a whole was evaluated. The formation of the nanoparticles was monitored visually (Fig. 1) and with UV-Vis spectroscopy (Figs. 2-10).
15
Content available remote Sorption properties of fly ash from brown coal burning towards arsenic removal
Polowczyk I., Bastrzyk A., Sawiński W., Koźlecki T., Rudnicki P., Sadowski Z.
Czasopismo Techniczne. Chemia
|
2011
|
R. 108, z. 1-Ch
135-142
EN
In the present work, the sorptive capacity of fly ash from the combustion of brown coal in relation to arsenic(III) removal from the standard solution as well as the potential application of fly ash in actual wastewater purification have been evaluated.
PL
W tym artykule zbadano pojemność sorpcyjną popiołów lotnych powstających podczas spalania węgla brunatnego w stosunku do arsenu(III) usuwanego z roztworu standardowego oraz zbadano możliwość zastosowania popiołów w oczyszczaniu ścieku rzeczywistego.
16
Content available remote Bioinspired synthesis of calcium carbonate colloid particles
Sadowski Z., Polowczyk I, Frąckowiak A., Koźlecki T., Chibowski S.
Physicochemical Problems of Mineral Processing
|
2010
|
Vol. 44
205-214
EN
Biomimetic procedure for nucleation and growth of CaCO3 has been presented. The wet chemical syntheses of CaCO3 colloidal particles have been carried out. The characterization of precipitated particles of CaCO3 has been done using the particle size distribution analysis. The effect of physical and chemical parameters on the size of precipitated particles of CaCO3 has been investigated. This research may provide new insight into the precipitation of calcium carbonate.
PL
Zaprezentowano biomimetyczną procedurę zarodkowania wzrostu CaCO3 przeprowadzając chemiczna syntezę „na mokro” koloidalnych cząstek CaCO3. Dokonano charakterystyki wytrąconych cząstek przez wyznaczenie ich składu ziarnowy. Badano też fizyczne i chemiczne parametry wytrąconych ziarn CaCO3. Badania te mogą dostarczyć nowego spojrzenia na precypitację węglanu wapnia.
17
Content available Właściwości sorpcyjne popiołów ze spalania węgla
Polowczyk I., Bastrzyk A., Sawiński W., Koźlecki T., Rudnicki P., Sadowski Z., Sokołowski A.
Inżynieria i Aparatura Chemiczna
|
2010
|
Nr 1
93-94
PL
Celem niniejszej pracy było zbadanie zdolności sorpcyjnych popiołu po spalaniu węgla brunatnego pod kątem adsorpcji arsenu (III). Uzyskane wyniki wskazują na znaczną pojemność sorpcyjną popiołu lotnego względem As(III) (33 mg/g), porównywalną do otrzymywanej na żywicach jonowymiennych. Dane doświadczalne dobrze opisuje izoterma Langmuira, a proces adsorpcji kontrolowany jest reakcją chemiczną pseudo drugiego rzędu (model PSO).
EN
The aim of work was to examine sorption of As(III) species, using fly ash from lignite burning. The results obtained show that the sorption capacity of fly ash (33 mg/g) is comparable to commercial sorbent. Experimental data can be described by means ofLangmuir isotherm. Adsorption process obeys the pseudo-second order (PSO) kinetics.
18
Content available remote Modelling of bioleaching kinetics of black shale ore based on changes of the surface area
Sadowski Z., Szubert A.
Chemical and Process Engineering
|
2010
|
Vol. 31, z. 1
107-118
EN
Black shale ore, originating from a copper mine near Lubin, Poland, was bioleached in columns, using autotrophic bacteria Acidithiobacillus ferrooxidans. The best copper recovery (84%) was obtained after 25 days of bioleaching. The kinetics of the bioleaching of copper bearing black shale ores was described using model equations based on changes of the surface area a of the leached ore. An average increase of surface area for ore particles was from 4.02 m2/g to 13.94 m2/g. It was found that the kinetics of the first stage of the process has an exponential character, whilst kinetics of the final stage is strongly limited by the character of the system. It was shown that the data obtained for the black shale ores fit to the model proposed in this study.
PL
Próbki łupkowej rudy miedzi z kopalni Lubin poddano bioługowaniu z użyciem bakterii Acidithiobacillus ferrooxidans. Po 25 dniach wyługowano 85% miedzi zawartej w rudzie. Kinetykę procesu bioługowania opisano za pomocą modelu, w którym podstawowym parametrem była zmiana powierzchni właściwej rudy w trakcie procesu. Zmiana powierzchni badanej próbki wyniosła od 4,02 m2/g do 13,94 m2/g. Ustalono, ze kinetyka pierwszego etapu procesu miała charakter wykładniczy, podczas gdy kinetyka drugiego okresu uzależniona była od badanego układu. Stwierdzono, że otrzymane wyniki doświadczalne są zgodne z zaproponowanym modelem.
19
Otrzymywanie nanocząstek metali metodami biotechnologii
Sadowski Z., Maliszewska I. H.
Rudy i Metale Nieżelazne
|
2009
|
R. 54, nr 10
614-618
PL
W artykule zostały przedstawione najnowsze osiągnięcia w zastosowaniu bionanotechnologii do otrzymywania nanocząstek metali. Szczególną uwagę poświęcono nanocząstkom srebra i złota oraz ich zastosowaniu. Nanocząstki metali, które są syntezowane przez mikroorganizmy, mogą być ulokowane wewnątrz, jak i na zewnątrz komórek tych mikroorganizmów. Do otrzymywania nanocząstek metali można także wykorzystać ekstrakty z liści wielu roślin i drzew. Obok głównej aplikacji nanocząstek metali w elektronice, znajdują one co raz to większe zastosowanie jako materiał antybakteryjny. Kompleksy nanocząstek metalu z lekami służą do monitorowania leku w organizmie człowieka.
EN
An important part of work in bionanotechnology concerns the synthesis of metal nanoparticles. Biosynthesis of both silver and gold nanoparticles has been described. Many microorganisms produced metal nanoparticles ether intra- or extracellularly. Well-known example is magnetotactic bacteria which able to synthesize magnetite nanoparticles. Some bacteria are able to reduce of Ag+ or AuCl4 - ions and form silver and gold nanoparticles. Biosynthetic method employing also plant extracts for the reduction of metal ions in solutions. Biosynthesis of metal nanoparticles is a new eco-frendly and "green" method. Metal nanoparticles have found potential application in many fields of advanced technology and medicine. The direct interaction of gold nanoparticles with drag gives a possibility to monitoring a drag migration in the human body.
20
Ługowanie laterytowych rud niklonośnych z użyciem grzybów pleśniowych
Szymańska A., Sadowski Z., Maliszewska I., Szubert A.
Rudy i Metale Nieżelazne
|
2009
|
R. 54, nr 7
404-409
PL
Zbadano możliwości wykorzystania metabolitów wytwarzanych przez dzikie grzyby strzępkowe do bioługowania krzemianowych rud niklu. Przetestowano kilkanaście szczepów pleśni, wyizolowanych ze środowiska naturalnego, głównie z rodzaju Aspergillus oraz Penicillium. Przeprowadzono badania wpływu zagęszczenia cząstek ciała stałego oraz pH na skuteczność i przebieg procesu bioługowania. Dokonano porównania wydajności procesu bioługowania z ługowaniem chemicznym. W oparciu o uzyskane wyniki, zaproponowano dwa warianty prowadzenia procesu ługowania z użyciem grzybów pleśniowych.
EN
The possibility of using metabolites produced by wild mycelial fungi for bio-leaching siliceous ores of nickel was investigated. A number of mould strains were tested, isolated from their natural environment, mainly from the Aspergillus and Penicillium groups. An effect of thickening solid particles and of pH on the efficiency and on the proceeding of the bioleaching process was investigated. Efficiencies of bio-leaching process and chemical leaching have been compared. Based on the obtained results two optional methods for conducting the leaching process using mould fungi have been proposed.
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