Hydrometallurgical Treatment of Smelted Low-Grade WEEE in Ammoniacal Solutions

2016 ◽  
Vol 682 ◽  
pp. 293-298
Author(s):  
Ewa Rudnik ◽  
Iwona Dobosz ◽  
Krzysztof Fitzner ◽  
Zbigniew Miazga
Keyword(s):  
High Purity ◽  
Copper Alloy ◽  
Ammonium Salts ◽  
Copper Recovery ◽  
Low Grade ◽  
Zinc Ions ◽  
Electronic Scrap ◽  
Copper Electrowinning ◽  
Secondary Reactions ◽  
Hydrometallurgical Treatment

Hydrometallurgical routes of copper recovery from smelted low-grade e-waste are presented. Electronic scrap was smelted to produce Cu–Zn–Ag-Sn alloys of various phase compositions. The alloys were then treated in the following ways: (a) anodic dissolution with simultaneous metal electrodeposition using ammoniacal solutions with various ammonium salts (chloride, carbonate, sulfate). This resulted in the separation of metals, where lead, silver and tin accumulated mainly in the slimes, while copper was transferred to the slime, electrolyte and then recovered on the cathode. (b) leaching in ammoniacal solutions of various compositions and then copper electrowinning. Alloy was leached in chloride, carbonate, sulfate and thiosulfate baths. This resulted in the separation of the metals, wherein copper and zinc were transferred to the electrolyte, while metallic tin and silver as well as lead remained in the slimes. Copper was selectively recovered from the ammoniacal solutions by the electrolysis, leaving zinc ions in the electrolyte. The best conditions of the alloy treatment were obtained, where the final product was copper of high purity (99.9%) at the current efficiency of 60%. Thiosulfate solution was not applicable for the leaching of the copper alloy due to secondary reactions of the formation of copper(I) thiosulfate complexes and precipitation of copper(I) sulfide.

Production of High Purity Alumina and Zeolite from Low-Grade Kaolin

2007 ◽  
pp. 187-190
Author(s):  
M.S. Meor Yusoff ◽  
M. Masilana ◽  
T.F. Choo ◽  
A.M. Julie
Keyword(s):  
High Purity ◽  
Low Grade

Copper Recovery by Bioleaching of Chalcopyrite: A Microcalorimetric Approach for the Fast Determination of Bioleaching Activity

2013 ◽  
Vol 825 ◽  
pp. 322-325
Author(s):  
Beate Krok ◽  
Axel Schippers ◽  
Wolfgang Sand
Keyword(s):  
Enrichment Culture ◽  
Sulfide Oxidation ◽  
Exothermic Reaction ◽  
Metal Sulfide ◽  
Copper Recovery ◽  
Heat Output ◽  
Low Grade ◽  
Non Invasive ◽  
Pure Cultures ◽  
Invasive Method

Low grade copper ores containing chalcopyrite are increasingly used for copper recovery via biomining. Since metal sulfide oxidation is an exothememic process, bioleaching activity can be measured due to the heat output by microcalorimetry, which is a non-destructive and non-invasive method. The bioleaching activity of pure cultures ofSulfolobus metallicus,Metallosphaera hakonensisand a moderate thermophilic enrichment culture on high grade chalcopyrite was evaluated. Chalcopyrite leaching by microorganisms showed a higher copper recovery than sterile controls. Chemical chalcopyrite leaching by acid produced heat due to the exothermic reaction, the heat output was increased while metal sulfide oxidation by microorganisms.

Bioleaching of Low-Grade Copper Sulfide Ore Using a Colum Reactor

2009 ◽  
Vol 71-73 ◽  
pp. 409-412
Author(s):  
Wen Qing Qin ◽  
Yan Sheng Zhang ◽  
Shi Jie Zhen ◽  
Jun Wang ◽  
Jian Wen Zhang ◽  
...  
Keyword(s):  
Iron Concentration ◽  
Mixed Cultures ◽  
Copper Recovery ◽  
Low Grade ◽  
Leaching Rate ◽  
Ministry Of Education ◽  
Copper Ore ◽  
Copper Leaching ◽  
Pure Cultures ◽  
Mixed Bacteria

The effects of several variables on the column bioleaching of copper sulphide ore have been investigated. The copper ore contained chalcopyrite as the main sulfide minerals and bornite and chalcocite as the minor minerals. The experiment was carried out using bench-scale column leach reactors designed in Key Lab of Biometallurgy of Ministry of Education, which were inoculated with the pure mesophile bacteria (Acidithiobacillus ferrooxidans) and thermophile bacteria (Sulfobacillus), respectively, and the mixed bacteria which contain both iron- and sulfur-oxidizing bacteria. The results show that the mixed cultures were more efficient than the pure cultures alone and the maximum copper recovery 53.64% was achieved using the mixed cultures after 85 days. The leaching rate of chalcopyrite tended to increase with the increased dissolved ferric iron concentration. The effect of particle size on the rate of the copper leaching was also investigated, and it was shown that the copper bioleaching rate decreases as the amount of fines increase, which limits the permeability, thus decreases leaching rate. Jarosite and elemental sulphur formed in the column were characterized by the X-ray and EDS.

scholarly journals Copper Recovery from Silicate-Containing Low-Grade Copper Ore Using Flotation Followed by High-Pressure Oxidative Leaching

2017 ◽  
Vol 64 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Baisui HAN ◽  
Batnasan ALTANSUKH ◽  
Kazutoshi HAGA ◽  
Yasushi TAKASAKI ◽  
Atsushi SHIBAYAMA
Keyword(s):  
High Pressure ◽  
Copper Recovery ◽  
Low Grade ◽  
Copper Ore ◽  
Oxidative Leaching

Bioleaching of Low-Grade Chalcopyrite Ore by the Thermophilic Archaean Acidianus brierleyi

2017 ◽  
Vol 262 ◽  
pp. 237-241 ◽  
Author(s):  
Norizoh Saitoh ◽  
Toshiyuki Nomura ◽  
Yasuhiro Konishi
Keyword(s):  
Environmentally Friendly ◽  
Copper Recovery ◽  
Copper Extraction ◽  
Low Grade ◽  
Column Reactor ◽  
Stirred Reactor ◽  
Acidianus Brierleyi ◽  
Environmentally Friendly Process ◽  
Chalcopyrite Ore

The thermophilic archaean, Acidianus brierleyi, was examined for its feasibility to bioleach copper from a low-grade chalcopyrite ore (1.15 % copper, 20.4 % iron and 2.63 wt% sulfur) at 65°C and pH 1.8-2.5. The chalcopyrite leaching was markedly accelerated in the presence of A. brierleyi, and an extremely high 80% leaching of copper in the low-grade ore (25-38 μm particles) was achieved in 14 days in a batch stirred reactor. By comparison, the leaching of iron was very slow and only a slight 5 % iron was leached in 14 days in the presence or absence of A. brierleyi. In other words, A. brierleyi selectively leached chalcopyrite while magnetite leaching by A. brierleyi was negligible. Moreover, bioleaching of the low-grade ore (53-75 μm particles) yielded 55% copper recovery after 20 days of operation in a column reactor. The good results for the copper bioleaching in the column reactor are very similar to those in the stirred reactor. These results lead to the conclusion that the thermophile bioleaching with A. brierleyi is attractive as an economical and environmentally friendly process for good copper extraction from low-grade chalcopyrite ore.

Efficiently Utilizing a Low Grade and Complex Copper Ore by Flotation

2013 ◽  
Vol 734-737 ◽  
pp. 929-934
Author(s):  
Qi Nie ◽  
Xiao Si Zhou ◽  
Fen Lan Peng ◽  
Xu Shen ◽  
Zhi Zhang Li
Keyword(s):  
Yunnan Province ◽  
Copper Recovery ◽  
Test Scheme ◽  
Low Grade ◽  
High Quality ◽  
Copper Ore ◽  
Copper Concentrate ◽  
Main Factors ◽  
Complex Copper

Based on the analysis of the properties of the copper ore from Jinggu area in Yunnan province, a suitable technical route was presented for processing of eligible copper concentrate and the main factors i.e. grinding fineness, Na2S dosage and collector dosage, affecting the quality of roughing concentration was investigated. On this basis, a close-circuit flotation test scheme was preceded, which obtained a high quality copper concentrate with Cu grade of 16.08%, copper recovery of 58.52%. The recovery of copper concentrate is much lower than the Cu recovery of roughing concentrate from the condition experiments. This may be contributed to the fact that fine slime carried by middling worsens the separation of copper minerals and gangues. The Mo was enriched in concentrate, which is significantly considered to recovery in further work.

scholarly journals Preparation of High Purity Manganese Sulphate from Low-Grade Rhodochrosite

2017 ◽  
Vol 2 ◽  
Author(s):  
Zefang ChenLi ◽  
Laijun Ma ◽  
Lei Mao ◽  
Fang Lian
Keyword(s):  
High Purity ◽  
Low Grade ◽  
Manganese Sulphate
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