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Method for selectively leaching nickel from high-nickel copper matte under normal pressure

A selective, high-nickel technology, applied in the field of hydrometallurgy, can solve the problems of ammonia nitrogen wastewater, short process flow, etc., to achieve the effect of short process and simple process

Active Publication Date: 2020-05-22
云南锡业研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of pressurized ammonia leaching is short, but the problem of ammonia nitrogen wastewater is prominent

Method used

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  • Method for selectively leaching nickel from high-nickel copper matte under normal pressure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The method for selectively leaching nickel from high-nickel copper matte, the steps are as follows:

[0030] (1) Grind high-nickel copper matte containing 57.5% copper, 2.1% nickel, 10.3% iron, 22% sulfur, and a small amount of other elements and impurities to -100 mesh, add dilute sulfuric acid and copper sulfate for selective leaching , Leaching conditions: the initial concentration of dilute sulfuric acid is 30g / L, the liquid-solid volume mass ratio of dilute sulfuric acid and high-nickel copper matte is 3:1 (ml:g), the concentration of copper sulfate is 10g / L, and the amount of copper sulfate added is high 0.05 times the weight of nickel-copper matte, the leaching reaction temperature is 60°C, and the reaction time is 6 hours to obtain nickel sulfate solution and leaching slag. The leaching slag is washed with water and filtered to obtain a low-nickel product containing 64.5% copper, 0.27% nickel, and 7.97% iron. Copper matte; the washing water of washing leaching s...

Embodiment 2

[0034] The method for selectively leaching nickel from high-nickel copper matte, the steps are as follows:

[0035] (1) Grind high-nickel copper matte containing 59.5% copper, 3.25% nickel, 13.6% iron, and 25% sulfur to -100 mesh, add dilute sulfuric acid and catalyst for selective leaching, leaching conditions: initial concentration of dilute sulfuric acid 50g / L, the liquid-solid volume mass ratio of dilute sulfuric acid and high-nickel copper matte is 6:1 (ml:g), the concentration of copper sulfate is 6g / L, the amount of copper sulfate added is 0.1 times of the weight of high-nickel copper matte, leaching The reaction temperature is about 92°C, and the reaction time is 4 hours to obtain nickel sulfate solution and leaching slag. The leaching slag is washed with water and filtered to obtain a low-nickel copper matte containing 65.3% copper, 0.51% nickel, and 9.14% iron; washing the leaching slag Water can be returned to continue washing;

[0036](2) The leachate returns to ...

Embodiment 3

[0039] The method for selectively leaching nickel from high-nickel copper matte, the steps are as follows:

[0040] (1) Grind high-nickel copper matte containing 55% copper, 5.8% nickel, 14.3% iron, and 20.1% sulfur to -100 mesh, add dilute sulfuric acid and catalyst for selective leaching, leaching conditions: initial concentration of dilute sulfuric acid 100g / L, the concentration of copper sulfate is 3g / L, the amount of copper sulfate added is 0.2 times the weight of high-nickel copper matte, the liquid-solid volume mass ratio of dilute sulfuric acid and high-nickel copper matte is 10:1 (ml:g), leaching The reaction temperature is 95°C, and the reaction time is 2 hours to obtain nickel sulfate solution and leaching slag. The leaching slag is washed with water and filtered to obtain a low-nickel copper matte containing 67.5% copper, 0.85% nickel, and 9.74% iron; washing water for washing the leaching slag Can be returned to continue washing;

[0041] (2) The leaching soluti...

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Abstract

The invention discloses a method for selectively leaching nickel from high-nickel copper matte under the normal pressure. The high-nickel copper matte comprises 55-60% of copper, 2-6% of nickel, 10-15% of iron and 20-25% of sulfur. The method comprises the steps that after the high-nickel copper matte is ground, a dilute sulphuric acid solution and a catalyst are added, selective leaching is conducted under the normal pressure, a nickel sulfate solution and leaching slag are obtained, after leaching liquid returns, enriched nickel is leached and iron removal is conducted, concentration crystallization is conducted, a rough nickel sulfate product is produced, nickel is recycled, and the leaching slag is low-nickel copper matte and can return to the copper smelting technology. By means of the method, copper and nickel in the high-nickel copper matte can be effectively separated under the normal pressure, and meanwhile the rough nickel sulfate product can be produced. The method is simple, easy to implement, short in process, free of waste gas and waste water production and emission, capable of saving energy and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a treatment method for high-nickel copper matte. Background technique [0002] Matte is an intermediate product produced in the smelting process of non-ferrous metals such as copper and nickel. During the copper smelting process, nickel enters the copper matte in the form of sulfide, and sometimes a high-nickel copper matte containing about 60% copper and more than 2% nickel is produced. Nickel is an impurity that is difficult to remove during copper fire refining. Most of it enters the electrolyte in the form of ions and is continuously enriched. Nickel has a great influence on the electrolytic refining of copper. During the electrolysis process of high-nickel anode copper, problems such as anode passivation, high anode slime rate, difficult anode slime settlement, more particles on the cathode copper surface, and easy oxidation and blackening are likely to ...

Claims

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Application Information

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IPC IPC(8): C22B23/00C22B7/00C01G53/10
CPCC22B23/043C22B7/007C01G53/10Y02P10/20
Inventor 张旭李发祥苏瑞春马良张雄林
Owner 云南锡业研究院有限公司