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Method for separating zinc and iron in zinc hydrometallurgy leaching slag

A technology for hydrometallurgical zinc smelting and leaching slag, which is applied in the field of zinc smelting and impurity removal, can solve problems such as insufficient processing technology of leaching slag, and achieve the effects of reducing the consumption of auxiliary materials, reducing investment costs and saving fuel.

Inactive Publication Date: 2016-12-14
HENAN YUGUANG ZINC IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of insufficient treatment process of the leaching slag produced in the prior art hydrometallurgy, and to provide a method that can effectively remove and utilize iron in the leaching slag, and at the same time recover valuable metals therein. A method for separating zinc and iron from leaching slag of hydrometallurgy zinc

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 A method for separating zinc and iron from leaching slag of zinc hydrometallurgy, comprising the following steps;

[0020] Step 1), add the leaching slag from the zinc hydrometallurgy and the preheated electrolytic waste liquid to the pulping tank at a liquid-solid ratio of 15:1 for pulping, and add sulfur dispersant sodium lignosulfonate to obtain slurry; H2SO4 concentration is 180g / L in described electrolytic waste liquid, and zinc content is 70g / L, and the consumption of described lignosulfonate sodium is 0.5% of leaching slag weight;

[0021] Step 2), use a booster pump to pump the slurry obtained in step 1) into the autoclave and feed compressed air for high-pressure leaching, and send the reacted slurry to the flash tank for cooling and pressure reduction; the pressure control in the autoclave At 2.5MPa, the temperature is controlled at 220°C, the initial acidity of the reaction is controlled at 150 g / L, the acidity at the end of the reaction is contr...

Embodiment 2

[0024] Embodiment 2 A method for separating zinc and iron from leaching slag of zinc hydrometallurgy, comprising the following steps;

[0025] Step 1), add the leaching slag from the zinc hydrometallurgy and the preheated electrolytic waste liquid to the pulping tank according to the liquid-solid ratio of 10:1, and add the sulfur dispersant sodium lignosulfonate to obtain the slurry; H in the electrolytic waste solution Concentration is 160g / L, zinc content is 50g / L, and the consumption of described lignosulfonate sodium is 0.1% of leaching slag weight;

[0026] Step 2), use a booster pump to pump the slurry obtained in step 1) into the autoclave and feed compressed air for high-pressure leaching, and send the reacted slurry to the flash tank for cooling and pressure reduction; the pressure control in the autoclave At 1.2MPa, the temperature is controlled at 170°C, the initial acidity of the reaction is controlled at 100 g / L, the acidity at the end of the reaction is controlle...

Embodiment 3

[0029] Embodiment 3 A method for separating zinc and iron from leaching slag of zinc hydrometallurgy, comprising the following steps;

[0030] Step 1), add the leaching slag from the zinc hydrometallurgy and the preheated electrolytic waste liquid to the pulping tank according to the liquid-solid ratio of 13:1, and add the sulfur dispersant sodium lignosulfonate to obtain the slurry; H in the electrolytic waste solution Concentration is 170g / L, zinc content is 60g / L, and the consumption of described lignosulfonate sodium is 0.3% of leaching slag weight;

[0031] Step 2), use a booster pump to pump the slurry obtained in step 1) into the autoclave and feed compressed air for high-pressure leaching, and send the reacted slurry to the flash tank for cooling and pressure reduction; the pressure control in the autoclave At 1.5MPa, the temperature is controlled at 180°C, the initial acidity of the reaction is controlled at 130 g / L, the acidity at the end of the reaction is controlle...

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Abstract

The invention relates to a method for separating zinc and iron in zinc hydrometallurgy leaching slag. Specifically, the leaching slag in zinc hydrometallurgy and preheated electrolysis waste liquor are added into a surge tank to be subjected to size mixing, sulfur disperser wood sodium sulfonate is added, and slurry is obtained; the above slurry is beaten into an autoclave through a booster pump, compressed air is led into the autoclave to conduct high-pressure leaching, the slurry obtained after the reaction is conveyed into a flash drum to be subjected to temperature and pressure reduction, and then the slurry obtained after temperature and pressure reduction is conveyed into a filter press to be subjected to pressing filtering, and filter liquor and filter residues are obtained; and the iron is deposited in the filter residues in the form of hematite, and after copper and indium are recycled from the filter liquor, neutral leaching is executed again. The above method for separating the zinc and the iron in the zinc hydrometallurgy leaching slag has the beneficial effects that the procedure is simple, fuel is saved, the investment cost is reduced, the iron removing efficiency is high, and valuable metal in the leaching slag can be recycled at the same time.

Description

technical field [0001] The invention belongs to the technical field of impurity removal in zinc smelting in the nonferrous metal smelting industry, and in particular relates to a method for separating zinc and iron from leaching slag of zinc in hydrometallurgy. Background technique [0002] At present, the production of zinc hydrometallurgy has accounted for more than 85% of the world's zinc production, mainly composed of roasting, leaching, purification, electrolysis, casting and other processes. Among them, the leaching slag treatment methods mainly include wet method and fire method, and the fire method is mainly : Volatilization kiln volatilization method and fuming furnace fuming method. The wet method mainly adopts hot acid leaching process to leach zinc and iron to remove iron. Iron removal methods include jarosite method, goethite method, hematite method law etc. [0003] Most domestic wet zinc smelting plants adopt volatilization kiln volatilization method, which h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B15/00C22B58/00C22B13/00C22B11/00
CPCC22B7/007C22B7/04C22B11/044C22B13/045C22B15/0067C22B58/00Y02P10/20
Inventor 倪恒发张向阳杨腾蛟张文科孔金换张阳
Owner HENAN YUGUANG ZINC IND
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