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Efficient recovery method of valuable metals in zinc leaching residues

A technology for leaching slag of valuable metals and zinc, which is applied in the field of zinc smelting, can solve the problems of low efficiency of metal comprehensive recovery, achieve the effects of reducing construction investment and production and operation costs, saving production water, and shortening the separation process

Active Publication Date: 2017-06-20
HENAN YUGUANG ZINC IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low benefit of comprehensive recovery of metals in the leaching slag in the zinc smelting process in the prior art, and provide a method for efficient recovery of valuable metals in zinc leaching slag

Method used

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  • Efficient recovery method of valuable metals in zinc leaching residues

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Effect test

Embodiment 1

[0035] Mix 19 tons of high-copper and high-silver zinc leaching slag containing 10% zinc, 15% iron, 0.5% copper, 0.01% indium, and 0.005% silver with 1 ton of silver-enriched slag containing 20% ​​zinc and 0.15% silver. Sulfuric acid 150g / l, zinc-containing 40g / l electrolytic solution is used as a pre-soaking agent and the mixture is pre-soaked, the liquid-solid mass ratio is 3:1, and the reaction is 0.5h to obtain 17.6 tons of pre-soaked slag and pre-soaked liquid. After pre-soaked The liquid enters the calcined sand leaching process of the main system; add the electrolytic solution containing 150g / l of sulfuric acid and 40g / l of zinc to the prepreg slag produced in the presoaking process for medium acid leaching, the liquid-solid weight ratio is 4:1, and the reaction The temperature was 65°C, the reaction time was 6 hours, and the final acidity was 50g / l. After the reaction, 9.16 tons of medium acid slag were obtained. These medium acid slags contained 8% zinc, 8% iron, 0.2% ...

Embodiment 2

[0037] Mix 10 tons of high-copper and high-silver zinc leaching slag containing 25% zinc, 40% iron, 3% copper, 0.05% indium, and 0.06% silver with 10 tons of silver-enriched slag containing 25% zinc, 1% silver, and mix the Sulfuric acid 200g / l, zinc-containing 60g / l electrolytic solution is used as a pre-soaking agent and the mixture is pre-soaked, the liquid-solid mass ratio is 5:1, and the reaction is 1 hour to obtain 17 tons of pre-soaked slag and pre-soaked liquid, and pre-soaked liquid Enter the calcined sand leaching process of the main system; add the waste electrolyte solution containing 200g / l of sulfuric acid and 60g / l of zinc to the pre-soaked slag produced in the pre-soaking process, and carry out medium-acid leaching, the liquid-solid weight ratio is 6:1, and the reaction temperature 75°C, reaction time 6h, terminal acidity 70g / l, 8.5 tons of neutral acid slag were obtained after the reaction, these medium acid slags contained 16% zinc, 15% iron, 0.4% copper, and 0...

Embodiment 3

[0039] Add 95 g / l of zinc, 3.5 g / l of iron, and 42 g / l of acid in the iron-removing solution produced by the hematite iron removal process, and add 18.5% of zinc, 22.5% of iron, and 0.9% of copper at a temperature of 93.5°C. %, indium 0.032%, silver 0.032% by weight accounted for 8 tons of zinc leaching slag accounting for 80% and 2 tons of zinc leaching slag containing 23.8% of zinc and 0.42% of silver accounting for 20% by weight, and the liquid-solid ratio was 3:1. 1h, 8.8 tons of pre-soaked slag and pre-soaked liquid were obtained. The pre-soaked liquid entered the calcined leaching process of the main system, and the acid-containing 128 g / l high-acid liquid from the high-acid leaching process was added to the pre-soaked slag produced in the pre-soaked process. , carried out medium acid leaching, the liquid-solid ratio was 4:1, the reaction temperature was 75°C, the reaction time was 6h, and the terminal acidity was 66g / l. After the reaction, 4.58 tons of medium acid slag c...

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Abstract

The invention belongs to the technical field of zinc smelting in the non-ferrous metal smelting industry, and particularly relates to an efficient recovery method of valuable metals in zinc leaching residues. The efficient recovery method mainly comprises the following steps: high-copper-content and high-silver-content zinc leaching residues and silver-rich residues are mixed uniformly, and an obtained mixture is subjected to preimpregnation, middle-acidity leaching, high-acidity leaching, reduction, neutralization, replacement, indium precipitation and hematite iron removal. The efficient recovery method is applicable to the treatment on the mixture of the high-copper-content and high-silver-content zinc leaching residues and the silver-rich residues, recovery rates of the valuable metals like indium, copper, silver and zinc are high, an iron-zinc separation flow is short, energy conservation and environmental protection are facilitated, the economic benefits are significant, and the recovery method is a clean, environmentally-friendly and efficient new method for comprehensive recovery of high-copper-content and high-silver-content zinc materials.

Description

technical field [0001] The invention belongs to the technical field of zinc smelting technology in the nonferrous metal smelting industry, and in particular relates to a method for efficiently recovering valuable metals from zinc leaching slag. 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. However, this method ha...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B19/20C22B13/00C22B15/00C22B58/00C04B7/22
CPCC04B7/22C22B7/007C22B13/045C22B15/0091C22B19/22C22B58/00Y02P10/20
Inventor 倪恒发杨腾蛟张向阳孔金换张文科张阳
Owner HENAN YUGUANG ZINC IND
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