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Method for comprehensively utilizing copper-nickel sulfide ores and system thereof

A technology for sulfide ore and copper-nickel, applied in the field of non-ferrous metal metallurgy, can solve the problem of inability to effectively recover cobalt and precious metals, and achieve the effect of effective recovery, risk reduction and energy saving

Active Publication Date: 2017-08-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is that the associated cobalt and precious metals cannot be effectively recovered in the existing copper-nickel sulfide ore treatment method

Method used

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  • Method for comprehensively utilizing copper-nickel sulfide ores and system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Such as figure 1 As shown, in this example, copper-nickel sulfide ore is matte-smelted to obtain low-matte nickel, and the content of main elements is: 20.21% Ni, 10.52% Cu, 37.44% Fe, 0.78% Co, and about 10g / t of precious metals.

[0062] Using this as raw material, leaching with 4mol / L sulfuric acid solution under normal pressure, the liquid-solid ratio is 10:1, the reaction temperature is 80°C, and the reaction is 0.5h. Iron, cobalt and nickel in low-nickel matte are leached into the solution, while almost all copper and precious metals are enriched in the leaching residue of cuprous sulfide, and the separation of copper and nickel and cobalt is realized. The copper content in the filtered solution is less than 0.005g / L, and the iron mainly exists in the form of ferrous ions, which can be directly oxidized by air without further reduction, while maintaining the pH of the solution at 3-5, so that iron can be removed by goethite precipitation , The obtained iron slag ...

Embodiment 2

[0065] Copper-nickel sulfide ore is smelted by matte making to obtain low nickel matte, the main element content: Ni 13.25%, Cu 8.32%, Fe38.44%, Co 0.64%.

[0066] Using this as raw material, leaching with 6mol / L sulfuric acid solution under normal pressure, the liquid-solid ratio is 2:1, the reaction temperature is 65°C, and the reaction is 1h. Iron, cobalt and nickel in low nickel matte are almost all leached into the solution, while copper is enriched in the slag, realizing the separation of copper and nickel and cobalt. The copper content in the filtered solution is less than 0.006g / L, and the iron mainly exists in the form of ferrous ions. Adjust the pH of the solution to 5-7, then place it in a closed autoclave, pass pure oxygen and heat up to 180°C, and iron with The hematite form is removed. The pH of the solution after iron removal is adjusted to 5, the cobalt is extracted with P507, and back-extracted with hydrochloric acid to obtain a cobalt chloride solution, whic...

Embodiment 3

[0069] Copper-nickel sulfide ore is smelted with matte to obtain low nickel matte, the main element content: Ni 16.55%, Cu 10.32%, Fe 33.44%, Co 0.34%, precious metal about 8.9 grams tons.

[0070]Using this as raw material, leaching with 1mol / L sulfuric acid solution under normal pressure, the liquid-solid ratio is 20:1, the reaction temperature is 25°C, and the reaction is 5h. Iron, cobalt and nickel in low-nickel matte are almost all leached into the solution, while copper and precious metals are enriched in the slag, realizing the separation of copper and nickel and cobalt. The copper content in the filtered solution is less than 0.008g / L, and the iron mainly exists in the form of divalent iron ions, without further reduction, it can be directly oxidized by passing 30%-60% oxygen-enriched air under normal pressure, and maintain the pH of the solution In 4-6, the iron is removed by precipitation of goethite, and the obtained iron slag is roasted into iron concentrate, which...

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Abstract

The invention provides a method for comprehensively utilizing copper-nickel sulfide ores and a system thereof. The method comprises the steps that (1), low nickel mattes obtained by matte smelting of the copper-nickel sulfide ores is subjected to normal pressure selective leaching directly through sulfuric acid, and hydrogen sulfide gas, leaching liquor and leaching residues are collected separately, wherein the temperature of normal pressure selective leaching is 25-80 DEG C; and (2), the leaching liquor in the step (1) is subjected to iron removal, iron-removed liquor and iron removal residues are collected separately, the iron-removed liquor is used for extracting of nickel and cobalt, the iron removal residues are used for iron making, and / or the leaching residues in the step (1) are sent to a copper smelting system to be smelted to obtain copper and precious metals. According to the method for the comprehensively utilizing the copper-nickel sulfide ores, deep separation of the nickel and the copper can be achieved, the recovery rates of the nickel, the copper, the cobalt and the precious metals are high, and high pure sulfur is output, so that storage is facilitated; and the process is simple, short in procedure, less in energy consumption and low in cost, and large-scale industrial production is easy.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal metallurgy, and more specifically, to a method and system for comprehensive utilization of copper-nickel sulfide ore. Background technique [0002] Nickel is an important strategic metal widely used in national defense, aerospace, transportation, petrochemical, energy and other fields. A considerable number of nickel ores are sulfide ores, associated with copper, cobalt and precious metals (gold, silver and platinum group metals), such as the Jinchuan copper-nickel mine in Gansu and the Kalatongke copper-nickel mine in Xinjiang. Therefore, it is necessary to consider the recovery of cobalt and precious metals while extracting nickel and copper. [0003] The traditional smelting process of copper-nickel sulfide ore is first to make matte smelting to enrich iron, nickel, cobalt and copper in the form of sulfide to form low nickel matte, and the associated precious metals are also enriched;...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/38C22B23/00C22B15/00C22B11/00
CPCC22B3/08C22B11/00C22B15/0028C22B15/0071C22B23/043C22B3/3844Y02P10/20
Inventor 赵中伟李永立肖万海刘旭恒陈星宇李江涛
Owner CENT SOUTH UNIV
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