Recovery of Lead and Zinc from Fine Dust of the Copper Smelting Industry Using a Chelating Agent

2018 ◽  
pp. 43-49
Author(s):  
S. Mamyachenkov ◽  
O. Anisimova ◽  
E. Kolmachikhina
Keyword(s):  
Chelating Agent ◽  
Copper Smelting ◽  
Fine Dust ◽  
Lead And Zinc

Oxidation Sulfuric Acid Autoclave Leaching of Copper Smelting Production Fine Dust

Metallurgist ◽  
2019 ◽  
Vol 62 (11-12) ◽  
pp. 1244-1249 ◽  
Author(s):  
K. A. Karimov ◽  
S. S. Naboichenko ◽  
A. V. Kritskii ◽  
M. A. Tret’yak ◽  
A. A. Kovyazin
Keyword(s):  
Sulfuric Acid ◽  
Copper Smelting ◽  
Fine Dust ◽  
Autoclave Leaching

An effective separation process of arsenic, lead, and zinc from high arsenic-containing copper smelting ashes by alkali leaching followed by sulfide precipitation

2020 ◽  
Vol 38 (11) ◽  
pp. 1214-1221
Author(s):  
Yuhui Zhang ◽  
Xiaoyan Feng ◽  
Bingjie Jin
Keyword(s):  
Separation Efficiency ◽  
Separation Process ◽  
Copper Smelting ◽  
Solid Ratio ◽  
Effective Separation ◽  
Lead And Zinc ◽  
Valuable Metals ◽  
Alkali Leaching ◽  
Sulfide Precipitation ◽  
High Arsenic

Separation of arsenic and valuable metals (Pb, Zn, Cu, Bi, Sn, In, Ag, Sb, etc.) is a core problem for effective utilization of high arsenic-containing copper smelting ashes (HACSA). This study developed an effective separation process of arsenic, lead, and zinc from HACSA via alkali leaching followed by sulfide precipitation. The separation behaviors and optimum conditions for alkali leaching of arsenic and sulfide precipitation of lead and zinc were established respectively as follows: NaOH concentration 3.81 M; temperature 80°C; time 90 minutes; liquid-to-solid ratio 4:1; agitation speed 450 revolutions/minute (r/min) and 2.0 times of theoretical quantity of sodium sulfide (Na2S); temperature 70°C; and time 60 minutes. The results indicated that the leaching rates of As, Pb, and Zn were 92.4%, 36.9% and 13.4%, respectively. More than 99% of lead and zinc were precipitated from the alkali leachate. The scanning electron microscopy/energy dispersive X-ray spectroscopy study confirmed that arsenic was dissolved from HACSA into the alkali leachate. Furthermore, lead and zinc were precipitated as sulfides from the alkali leachate. The proposed process was a good technique for separation of arsenic and enrichment of valuable metals for further centralized treatment separately. It provided high separation efficiency of arsenic and valuable metals, as well as low environmental pollution.

scholarly journals Detoxification of Arsenic-Containing Copper Smelting Dust by Electrochemical Advanced Oxidation Technology

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1311
Author(s):  
Meng Li ◽  
Junfan Yuan ◽  
Bingbing Liu ◽  
Hao Du ◽  
David Dreisinger ◽  
...  
Keyword(s):  
Solid Waste ◽  
Arsenic Removal ◽  
Removal Rate ◽  
Advanced Oxidation ◽  
Copper Smelting ◽  
Lead And Zinc ◽  
Heavy Nonferrous Metals ◽  
Advanced Oxidation Technology ◽  
Oxidation Technology ◽  
Smelting Dust

A large amount of arsenic-containing solid waste is produced in the metallurgical process of heavy nonferrous metals (copper, lead, and zinc). The landfill disposal of these arsenic-containing solid waste will cause serious environmental problems and endanger people’s health. An electrochemical advanced oxidation experiment was carried out with the cathode modified by adding carbon black and polytetrafluoroethylene (PTFE) emulsion. The removal rate of arsenic using advanced electrochemical oxidation with the modified cathode in 75 g/L NaOH at 25 °C for 90 min reached 98.4%, which was significantly higher than 80.69% of the alkaline leaching arsenic removal process. The use of electrochemical advanced oxidation technology can efficiently deal with the problem of arsenic-containing toxic solid waste, considered as a cleaner and efficient method.

Mechanism of oxides reduction during bubbling of copper-smelting slags by CO–CO2 gas mixtures

2019 ◽  
pp. 13-22 ◽  
Author(s):  
A. A. Komkov ◽  
R. I. Kamkin
Keyword(s):  
Gaseous Phase ◽  
Kinetic Constant ◽  
Reduction Process ◽  
Reduction Reaction ◽  
Copper Smelting ◽  
Oxide Reduction ◽  
Liquid Phases ◽  
Lead And Zinc ◽  
The Difference ◽  
Slag Reduction

The paper suggests a mechanism of simultaneous oxide reduction from multicomponent copper-smelting slags during their bubbling with CO–CO2 reducing mixtures and provides a numerical algorithm developed to implement this mechanism as a mathematical model. The first feature of the suggested mechanism is a statement that the total speed of the overall reduction process is determined by CO consumption during its interaction with oxygen ions formed in slag oxide dissociation. The second feature is a statement about equilibrium achieved between slag, alloy and gaseous phase according to the system oxidizing potential reached at every instant. The paper demonstrates a satisfactory agreement between calculated and experimental data obtained when reducing industrial coppersmelting slags at 1300 °С and СО/СО2 = 4, 6, 156, and using the first-degree kinetic equation regarding the difference between initial and equilibrium CO contents in the gaseous phase. A generalized kinetic constant of the multicomponent slag reduction reaction rate is calculated as k = 2.6·10–7, moles CO /(cm2 · sec·%) at 1300 °С. It is shown that during industrial multicomponent slag reduction, reduction speed of copper (I) oxide and magnetite are high and close to maximal ones as early as at the first minutes of slag bubbling with reducing gas. At the same time, for Fe(II), lead and zinc oxides they are low at the first minutes of the process, and increase gradually to reach their maximum, and then decrease again up to near-zero values as the supplied gas and melt come to equilibrium. Generally, oxide reduction speed naturally decreases with approaching to equilibrium between the initial gas and liquid phases, and this should be taken into account when designing continuous slag depletion processes.

Chelating-Agent-Enhanced Copper, Lead and Zinc Extraction From Iraqi Contaminated Sandy Soil.

2018 ◽  
Vol 7 (4.20) ◽  
pp. 79
Author(s):  
Hatem Asal Gzar ◽  
Khamaal Mohsin Ksee
Keyword(s):  
Experimental Data ◽  
Flow Rate ◽  
Contaminated Soil ◽  
Ethylenediaminetetraacetic Acid ◽  
Chelating Agent ◽  
Extractant Concentration ◽  
Soil Extraction ◽  
Equilibrium Time ◽  
Lead And Zinc ◽  
Copper Lead

This research aims to investigate extraction of copper, lead, and zinc from Iraqi sandy contaminated soil. Two systems were tested single and ternary component systems. Chelating agent ethylenediaminetetraacetic acid disodium salt (Na2EDTA) was utilized as extractant. Amount of 500 mg of metal per kg soil was prepared to form artificially contaminated soil. Extraction of metals was achieved using column extraction mode. Experimental tests were conducted at different conditions of  Na2EDTA concentration,flow rate, and contact time. The results illustrated that the maximum removal percentages for single component system were 92% ,76% and 68% at equilibrium time 6, 8,  and 8 hours for Pb , Cu and Zn,  respectively. While for ternary system were 82%, 72% and 65%, respectively, at equilibrium time 6 hours for Cu and 8 hours for Pb and Zn. In addition to the best equilibrium time, the other optimum conditions for both systems were 0.1 mol/L extractant concentration, pH 4 and flow rate 20 ml/hr. The sequence of heavy metals removal was Pb > Cu >Zn. The experimental data were tested by applying it in four kinetic models; first order, two constant, parabolic diffusion, and Elovich model. Elovich and parabolic diffusion were the most fitted models to the experimental data. 

Copper Smelting Fine Dust Autoclave Leaching

2019 ◽  
Vol 946 ◽  
pp. 615-620 ◽  
Author(s):  
Anton Kovyazin ◽  
Konstantin L. Timofeev ◽  
Sergey Krauhin
Keyword(s):  
Copper Smelting ◽  
Molar Ratio ◽  
Solution Temperature ◽  
Arsenic Content ◽  
Copper Extraction ◽  
Fine Dust ◽  
Lead Carbonate ◽  
Autoclave Leaching ◽  
Dust Composition ◽  
Copper Zinc

At present, arsenic content in copper concentrates is increasing, which leads to an increase in its content in all smelting products, the largest amount of arsenic is transferred in fine dust (dust composition,%: 10-12 Zn, 11-13 Pb, 8-15 Cu , 12-14 Fe, 5-10 As). Autoclaved leaching of dusts (temperature 160-200 °C, oxygen pressure 0.4-0.8 MPa, molar ratio H2SO4 /(Cu + Zn) = 0.75-2.25) to obtain a copper-zinc solution and a cake containing arsenic, iron and lead was studied. Copper extraction in the solution reaches 92%, zinc 95%. Lead, arsenic and iron are concentrated in the cake. Lead from cake is extracted by leaching in sodium chloride solution (temperature 60-70 ° C, NaCl concentration 300 g / dm3). The extraction of lead into the solution is 95%, subsequently lead is precipitated as lead carbonate.

Study of face mask filtration efficiency to prevent fine dust to secure people’s right to health

2020 ◽  
Vol 19 (2) ◽  
pp. 186-193
Author(s):  
Woo-Taeg Kwon ◽  
◽  
Min-Jae Jung ◽  
Bum-Soo Kim ◽  
Woo-Sik Lee ◽  
...  
Keyword(s):  
Face Mask ◽  
Right To Health ◽  
Filtration Efficiency ◽  
Fine Dust
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