Technique for recycling ammonium sulfate to extract copper from copper sulphide minerals through wet process

A technology of copper sulfide ore and process method, which is applied in the direction of improving process efficiency, etc., can solve problems such as secondary pollution, difficulty in large-scale application, and increased production costs, so as to reduce energy consumption and production costs, reduce use costs, and solve The effect of dealing with problems

Inactive Publication Date: 2016-02-10
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the treatment with lime neutralization method is simple and easy, it makes the acid solution unable to be recycled, which not only increases the production cost, but also has the problem that a large amount of copper-containing gypsum is difficult to handle and easily causes secondary pollution.
Because of this, although the sulfuration roasting-leaching-extraction-electrowinning copper extraction process was popular for a while, like other wet copper extraction processes, it is ultimately difficult to apply it on a large scale in production

Method used

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  • Technique for recycling ammonium sulfate to extract copper from copper sulphide minerals through wet process

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Experimental program
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Embodiment 1

[0041] In this embodiment, the copper sulfide concentrate of Hubei Daye Nonferrous Metals Co., Ltd. is selected. After analysis, the main chemical components are: Cu20.27%, Fe28.36%, S29.21%, SiO 2 12.43%, Zn0.65%, Pb0.13%, MgO0.39%, As0.53%, CaO3.42%, Ni0.018%, Al 2 o 33.16%. Among them, copper minerals are mostly primary copper sulfide, which is difficult to be leached, with a ratio of 82.54%, and secondary copper sulfide and copper oxide, which are easy to be leached, only account for 15.54%, and contain alkaline gangue minerals, which will consume more acid when leaching with sulfuric acid , and at the same time bring difficulties to the selective leaching of copper.

[0042] The process method of recycling ammonium sulfate used in the present embodiment to extract copper by wet method from copper sulfide ore is characterized in that it comprises the following steps:

[0043] (1) Mix 50g copper sulfide ore with 30% ammonium sulfate, place it in a porcelain ark, put it i...

Embodiment 2

[0048] The copper sulfide concentrate that this implementation selects is the same as embodiment 1, and the operating steps of the processing method of the wet extraction copper from copper sulfide ore by recycling ammonium sulfate are roughly the same as embodiment 1, and the difference is that: 50g of this copper concentrate Mix with 28.5g of ammonium sulfate, and add 1g of potassium sulfate as catalyst.

[0049] The leaching rate of copper in this embodiment can reach 98.73%, and the NH decomposed by roasting 3 , 97.11% can be absorbed and neutralized by waste acid liquid to generate ammonium sulfate.

Embodiment 3

[0051] This embodiment selects the copper sulfide concentrate of Jiangxi Dexing Copper Mine, and the main chemical components after analysis are: Cu24.35%, Fe29.79%, S31.42%, SiO 2 10.11%, Al 2 o 3 4.06%, Zn0.06%, Pb0.16%, MgO0.85%, As0.09%, CaO0.83%, Mo0.05%. Among them, chalcopyrite is the main copper mineral, followed by tetrahedrite, arsenite, chalcocite, bornite, malachite, azurite and copper blue. Other metallic minerals mainly include pyrite, hematite, magnetite and a small amount of molybdenite, and non-metallic minerals mainly include quartz, sericite and chlorite.

[0052] The process method of recycling ammonium sulfate used in the present embodiment to extract copper by wet method from copper sulfide ore is characterized in that it comprises the following steps:

[0053] (1) Mix 50g copper sulfide ore with 36 ammonium sulfate, place it in a porcelain ark, put it into a tubular roaster and roast it at 500°C for 100min, and obtain calcined sand and ammonia gas aft...

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Abstract

The invention belongs to the field of wet process copper extraction, and particularly relates to a technique for recycling ammonium sulfate to extract copper from copper sulphide minerals through a wet process. The technique particularly comprises the following steps that the copper sulphide minerals and the ammonium sulfate are mixed and subjected to sulfating roasting; water or a sulfuric acid solution is added into roasted ore to be subjected to copper leaching treatment; metal copper is extracted from an immersion solution through an extraction and electrodeposition process, the generated waste acid pickle part returns to the leaching copper, surplus waste acid pickle is neutralized by ammonia gas decomposed by roasting to obtain ammonium sulfate, and the ammonium sulfate is crystallized out through a solvent-out crystallization method to be recycled. The sulfating roasting temperature is 400-500 DEG C, the copper minerals are mainly converted into freely soluble CuSO4 or CuO.CuSO4 by controlling the roasting temperature, iron minerals are mainly converted into difficultly soluble FeS, sulphur is left in the roasted ore mainly in a simple substance mode, SO2 gas is not generated, the environment is not polluted, and subsequent selective copper leaching is facilitated.

Description

technical field [0001] The invention belongs to the field of wet extraction of copper, in particular to a process for recycling ammonium sulfate for sulfation roasting, and then wet extraction of copper from copper sulfide ore. Background technique [0002] Copper sulfide ore is one of the most important copper ore resources in the world. Although the extraction of copper from copper sulfide ore is still dominated by pyrometallurgy, the pyrometallurgical process has higher requirements on the grade of copper ore, and there are high energy consumption, complicated process and SO 2 Gas and toxic metal compounds such as arsenic pollute the environment. As the grade of copper sulfide ore resources becomes lower and lower, it becomes more and more difficult to select, and the requirements for environmental protection continue to increase, coupled with the large fluctuations in copper prices in recent years, the disadvantages and shortcomings of the pyrometallurgical copper smelt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B15/00C22B1/02C22B3/08C22B3/26
CPCY02P10/20
Inventor 张泽强
Owner WUHAN INSTITUTE OF TECHNOLOGY
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