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The principle of chemical pickling equipment copper hydrometallurgy extraction

by:Deyuan      2020-08-05
The principle of chemical pickling equipment copper hydrometallurgy extraction
chemical pickling equipment a solvent extraction a basic process of bioleaching is shown in figure 1.


copper oxide ore leaching principle. Common copper oxide minerals are malachite, chrysocolla, mainly red copper ore, pyrite, leaching agent for H2SO, and Fe2 ( SO4) 3, the reaction of the chemicals leaching process is:
malachite Cu2 ( 哦) 2 co3 ten 2 h2s. 。 。







( Cover: the principle of chemical pickling equipment copper hydrometallurgy extraction)







the principle of chemical pickling equipment copper hydrometallurgy extraction
chemical pickling equipment a solvent extraction is a basic process of bioleaching is shown in figure 1.


copper oxide ore leaching principle. Common copper oxide minerals are malachite, chrysocolla, mainly red copper ore, pyrite, leaching agent for H2SO, and Fe2 ( SO4) 3, the reaction of the chemicals leaching process is:
malachite Cu2 ( 哦) 2 co3 2 - h2so4 = 2 cuso4 ten CO2 10 3 h2o;
chrysocolla CuSiO3 · nH2SO4 - H2SO4 = CuSO4 ten SiO2 + ( n + 1) H20;
red copper ore Cu2O + 2 h + = Cu2 + + Cu + H2O;
azurite Cu ( 哦) 2, ten - h2so4 = 2 CuCO3 cuso4 ten CO2 3 h2o
copper sulfide ore leaching principle. For the copper sulfide ore, biological oxidation leaching of copper is currently one of the research of technology.
microbial mainly now used for biological leaching of thiobacillus ferrous oxide and sulfur oxide sulfur bacillus. They can be in below 35 ℃ high acid and high concentration of heavy metals to survive in the environment. Mechanism of bacterial oxidation leaching is thought to have two kinds: bacteria adsorbed to the mineral surface directly with mineral make direct mechanism of dissolved minerals; Mineral dissolution releasing Fe2 + in solution by bacterial oxidation into Fe3 +, Fe3 + as oxidant indirectly or chemical action mechanism of the oxidation of sulfide ore.
molybdenite bacterial leaching of molybdenite in the presence of acidic and Fe3 +, can be oxidized to FeSO, and S:
10 2 fez2 (Cu2S SO4) 3 = 2 cuso4 10 4 FeSO4 + S
the generated FeSO, and S by bacterial oxidation into Fe2 (again SO) 4, and H2S4, so reaction cycle,
in the role of bacteria, molybdenite can be dissolved oxygen oxidation and:
2 o2 + 2 - h2so4 cu2s + 5 = 4 cuso4 ten 2 h2o
leaching of molybdenite was thought to be Fe3 + indirect oxidation, bacteria are indirect oxidant leaching reaction.
bacterial leaching of copper blue. Due to leaching environment Fe3 + and no other oxidant, so the leaching effect can be caused by bacteria, acid consumption is equal to zero during the leaching, the reaction is:
CuS ten 2 O2 = CuSO4
bacteria leaching in minerals show that, after leaching minerals show that the chemical composition of unchanged, explains that didn't translate into other sulfide in leaching in the middle of the process, also did not produce element S
sulfur bacteria leaching of arsenic copper in H2O, O2, under the condition of existence in the oxidation of ferrous sulfur bacillus sulfur oxide sulfur bacillus and compound bacteria, sulfur, arsenic copper direct leaching reaction:
4 cuass ten 6 h} 0十 1302 = 4 h3as04 10 4 cus02
bacterial leaching of chalcopyrite, bornite reaction under the condition of bacteria are directly with Fez2 ( SO) 3 occurred as follows:
CuFeS2 fe2 + 2 ( SO) 3=CuSO4+2FeSO4十2S
    2 CuSFeS2+2Fe2 ( SO4) 3十 1702 = 1 0 cuso2 4 feso4 ten 2 FeO
the FeSO and FeO in under the action of acid and bacteria into F2e ( SO4) 3 and continue reaction.
3。 For a hydrometallurgical treatment of copper ore type
for copper oxide ore, ore particle size, as long as the control usually can obtain satisfactory effect of leaching. But the copper sulfide ore according to its different mineral species, its leaching effect differences. Currently adopted abroad biological oxidation process of copper ore in secondary basically sulfur
a copper ore such as chalcocite, digenite and covellite is given priority to, and for native copper sulfide ore is still holds. For ore type, the main processing porphyry copper deposits, wet process was mainly large porphyry copper mine, contain less alkaline gangue, sulfuric acid leaching is the ideal raw material. Such as domestic of dexing copper mine, purple mountain copper, copper deposits in the zhongtiao mountains in meiyukou mine, dabaoshan copper ore, etc. Number of skarn type copper mine in our country, more than 50%, reserves accounted for 29% of total reserves, generally on a smaller scale, decentralised, orebody occurrence condition is complex, most suitable for the underground mining, the mining cost is higher. Also contain alkaline gangue more, go against using sulfuric acid leaching.
3, hydrometallurgy process adopted in domestic copper mine, the application of the domestic production of wet process pilot plant of dexing copper mine, purple mountain copper, copper deposits in the zhongtiao mountains in meiyukou mine, etc.
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