Recovery of Valuable Metals from High-Content Arsenic Containing Copper Smelting Dust

2017 ◽  
pp. 183-192
Author(s):  
Xuepeng Li ◽  
Dachun Liu
Keyword(s):  
Copper Smelting ◽  
Valuable Metals ◽  
Smelting Dust

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.

scholarly journals SLAGS OF THE METALLURGICAL PLANTS OF ARMENIA AT FINE GRINDING

2019 ◽  
Vol 62 (1) ◽  
pp. 8-14 ◽  
Author(s):  
V. A. Martirosyan ◽  
M. E. Sasuntsyan
Keyword(s):  
Chemical Properties ◽  
Complex Compounds ◽  
Raw Material ◽  
Copper Smelting ◽  
Iron Silicides ◽  
Fine Grinding ◽  
High Temperature Synthesis ◽  
Valuable Metals ◽  
Physical And Chemical ◽  
The Impact

In connection with the development of copper and molybdenum production in Armenia, it becomes necessary to develop a technology for processing the slags of the functioning metallurgical plants to extract valuable metals from these slags. It concerns the copper slags of Alaverdi Copper-Smelting Plant with a content of FeO ~50  % and the molybdenum slags of Yerevan “Pure Iron” Plant with a content of SiO2 ~80  %. These slags are obtained at high temperatures (with FeO·SiO2 , CaO·SiO2 , Fe3 O4 ) and, therefore, they are less active to be used later. Meanwhile, the mentioned slags are rich in iron and silicon oxides and can serve as a cheap raw material for producing iron silicides. The iron silicides can be used in micro- and nanoelectronics, as well as in metallurgy as an alloying additive in the production of steels of special physical and chemical properties. The production of such valuable silicides from an inexpensive raw material is important for Republic of Armenia and is of not only economic, but also ecological significance. To obtain iron silicides, a method of combined aluminothermal reduction of primarily mechanoactivated copper and molybdenum slags is proposed. The preliminary mechanoactivation allows to purposefully affect the structure of the reaction mixture and parameters of the self-propagating high-temperature synthesis (SHS), thus ensuring the possibility of regulating the structure and phase composition of the synthesized silicides. This work considers issues on the impact of transformation and phase formation on the morphology of slags of copper and molybdenum production in the functioning Armenian metallurgical plants at mechanochemical activation by the method of fine grinding in a vibromill. It is shown that at fine grinding (up to 10  mcm), the slags, containing small-reactivity complex compounds of iron and silicon (fayalite, magnetite, quarzite) undergo profound chemical changes, transforming into amorphous oxides. The obtained activated oxides can serve as a raw material for producing iron- and silicon-containing alloys – iron silicides.

Recovery of valuable metals from copper smelting open-circuit dust and its arsenic safe disposal

2021 ◽  
pp. 106067
Author(s):  
Wei Gao ◽  
Bin Xu ◽  
Junkui Yang ◽  
Yongbin Yang ◽  
Qian Li ◽  
...  
Keyword(s):  
Open Circuit ◽  
Copper Smelting ◽  
Safe Disposal ◽  
Valuable Metals

Study on Treatment of Smelting Contaminated Acid by Evaporation Condensing Process

2014 ◽  
Vol 881-883 ◽  
pp. 564-569
Author(s):  
Da Chao Zhang ◽  
Xiao Lai Liu ◽  
Da Ming Guan ◽  
Xiao Yi Xu ◽  
Su Ying Wu
Keyword(s):  
Sulfuric Acid ◽  
Removal Rate ◽  
Solid Wastes ◽  
Copper Smelting ◽  
High Concentration ◽  
Removal Rates ◽  
Processing Cost ◽  
Valuable Metals ◽  
Different Temperatures ◽  
Copper Zinc

Copper smelting gas producing sulfuric acid process produces contaminated acid which contains high concentration of fluorine, chlorine, arsenic and copper, zinc, lead, cadmium and other metals. The sulfide precipitation and lime neutralization methods have been used at present. Those methods have some deficiencies as which produces a lot of hazardous and unwieldy solid wastes, spends huge processing cost, reuse difficultly the water after treatment. In this paper, according to characteristics of this kind of smelting contaminated acid, evaporation condensing process and the feasibility of recycling arsenic, sulfuric acid and valuable metals were studied. Under the condition of atmospheric heating evaporation, this study explored the distribution characteristics of fluorine, chlorine, sulfate radical, arsenic in condensate and in concentrate and the crystallization removal rates of arsenic trioxide in concentrate at different temperatures and different enrichment ratios. The results show arsenic, fluorine and chloride have good removal rates from contaminated acid by evaporation condensing process. Temperature at 130°C, enrichment multiple in 6~7, the removal rate of arsenic, fluorine and chlorine reached 62%, 88%, 77%. The results also show evaporation condensing process has good application prospects to treat smelting contaminated acid.

Selective and Multi-Step Leaching of Valuable Metals from Scrap Copper-Smelting Sludge

2015 ◽  
Vol 737 ◽  
pp. 642-645 ◽  
Author(s):  
Zhong Guang Ji ◽  
Zheng Xu ◽  
Wei Wang ◽  
Li Mei Yang
Keyword(s):  
Sulphuric Acid ◽  
Acid Concentration ◽  
Waste Recycling ◽  
Copper Smelting ◽  
Leaching Process ◽  
Valuable Metals

Valuable metals in smelting sludge from smelting industry have a recovery value. In this work, for realizing waste recycling effectively, selective and multi-step leaching of valuable metals was investigated with scrap copper-smelting sludge as research object. The effect of the concentration of sulphuric acid on leaching rates of valuable metals was investigated first. The results showed that the leaching rates of Cu, Zn and Ni were 6.1%, 59.4% and 63.3% at the acid concentration of 65g/L. Then, the results of the selective and multi-step leaching indicated that the leaching rates of Cu, Zn and Ni were over 90% after two-step leaching. In third step, the content of Cu in leached residue was 6.68%, which was higher than origin sludge. Repeat three-step leaching process above, Zn and Ni were leached selectively and Cu was accumulated in leached residue continually.

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