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Method for producing cathode nickel by selective leaching-electrodeposition of high nickel matte

A cathode nickel, selective technology, applied in the improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of acid imbalance in the production system, increased waste water discharge, unfavorable environmental protection, etc., to solve the problem of excess acid in the production system, promote Leaching, the effect that is beneficial to environmental protection

Inactive Publication Date: 2010-11-17
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are following deficiencies in the processing of nickel matte materials in converters: In order to achieve a high leaching rate of nickel, a considerable part of the sulfur in the raw material is oxidized to sulfate radicals during the pressure leaching process, which causes acid imbalance in the production system and consumes a large amount of Neutralization with soda ash or caustic soda will increase the alkali consumption and cause the accumulation of sodium ions in the production system, thereby increasing waste water discharge, loss of reagents and not conducive to environmental protection

Method used

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  • Method for producing cathode nickel by selective leaching-electrodeposition of high nickel matte
  • Method for producing cathode nickel by selective leaching-electrodeposition of high nickel matte
  • Method for producing cathode nickel by selective leaching-electrodeposition of high nickel matte

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In the second-stage pressure-fixed sulfur leaching, the anolyte is used as the leaching agent, and the calcine of the second-stage pressure leaching slag is used as the sulfur-fixing agent. The composition of primary atmospheric pressure leaching slag, calcined sand and anolyte is listed in the following table.

[0026] Table 1 1st stage normal pressure leaching slag and calcined sand composition (%)

[0027]

[0028] Table 2 Anolyte composition (g / L)

[0029] Element

Ni

h 2 SO 4

Content (g / L)

60.44

51.9

[0030] Add 100g of atmospheric pressure leaching residue, 21g of calcine and 900mL of anolyte into a 2L electromagnetically stirred autoclave, heat to 150°C, fill in air to control the oxygen partial pressure in the autoclave within the range of 0.02-0.06MPa, and pressurize the leaching 30min., cooling, and filtering to obtain 855mL of pressurized leaching solution and 73.2g of pressurized leaching residue. The results...

Embodiment 2

[0038] Put 100g of atmospheric pressure leaching residue, 25g of calcine and 900mL of anolyte into a 2L electromagnetically stirred autoclave, heat to 160°C, fill in air to control the oxygen partial pressure in the autoclave within the range of 0.02-0.06MPa, and pressurize for 30min ., cooled and filtered to obtain 850mL of pressurized leaching solution and 74.6g of pressurized leaching residue. The pressurized leaching results are listed in Table 5.

[0039] Table 5 Results of pressure-fixed sulfur leaching experiments

[0040]

Embodiment 3

[0042] Add 100g of atmospheric pressure leaching residue, 10g of calcine and 900mL of anolyte into a 2L electromagnetically stirred autoclave, heat to 180°C, fill in air to control the oxygen partial pressure in the autoclave within the range of 0.02-0.06MPa, and pressurize the leaching 30min., cooled, and filtered to obtain 840mL of pressurized leaching solution and 70.4g of pressurized leaching residue. The pressurized leaching results are listed in Table 6.

[0043] Table 6 Results of pressure-fixed sulfur leaching experiments

[0044]

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PUM

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Abstract

The invention discloses a method for producing cathode nickel by the selective leaching-electrodeposition of high nickel matte, which relates to a method for producing the cathode nickel by hydrometallurgical refining of the high nickel matte. The method is characterized in that the cathode nickel production process comprises the following steps of: (1) performing first-stage normal-pressure leaching on the high nickel matte; (2) removing cobalt from first-stage normal-pressure leachate for purification and producing electric nickel by electrodeposition; (3) adding a sulphur fixing agent into a first-stage leaching residue to perform second-stage pressing and sulphur fixing leaching, and returning the leachate which is obtained by the second-stage pressing and sulphur fixing leaching to perform first-stage normal-pressure leaching; and (4) desulfurating and roasting the leaching residue obtained by the second-stage pressing and sulphur fixing leaching to obtain a roasted product, and returning the roasted product which is used as the sulphur fixing agent in the step (3). The method of the invention effectively solves the problem of acid excess of a production system, has a high nickel recovery rate and low production cost, is highly adapted to different high nickel matte raw materials and favorable for environmental protection, and can obviously reduce the waste water emission in the production.

Description

technical field [0001] The invention relates to a method for producing cathode nickel by selective leaching-electrowinning of high nickel matte, and relates to a method for producing cathode nickel by wet refining of high nickel matte. Background of the invention [0002] At present, most of the domestic and foreign factories producing electro-nickel use nickel-containing sulfide ore as raw material, and make high-grade nickel matte or metal anode through rough refining. (2) high matte nickel chlorination refining process; (3) nickel concentrate roasting-reduction smelting metal anode-metal anode electrolysis-anolyte purification process; (4) high matte nickel sulfuric acid medium selective leaching-purification-nickel electrolysis product technology. The solution of the first three processes is a high-chloride system, which requires high anti-corrosion equipment. At the same time, the two processes (1) and (3) not only have a low direct nickel recovery rate, but are also n...

Claims

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Application Information

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IPC IPC(8): C22B3/08C25C1/08C22B23/00
CPCY02P10/20
Inventor 林江顺黄振华蒋开喜何德礼王海北蒋训雄张邦胜刘三平王玉芳张磊冯爱玲闫丽黄胜
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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