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Method for extracting indium-zinc and recovering tin from high tin high indium-zinc leaching residues

A technology of zinc leaching slag and high indium, applied in the direction of improving process efficiency, etc., can solve the problems of high energy consumption, large consumption of hydrochloric acid and soda ash, corrosion of production plants, etc., and achieve the effect of high energy consumption

Inactive Publication Date: 2013-01-30
LAIBIN CHINA TIN SMELTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this process are: (1) The consumption of hydrochloric acid and soda ash is large. For every ton of zinc leaching slag, 1 ton of industrial hydrochloric acid and 0.5 tons of industrial soda ash are consumed; (2) The on-site environment of the leaching process is poor. Hydrochloric acid is a volatile acid, and the acid mist generated during the leaching process is large, which is not conducive to the health of production workers, but also seriously corrodes production plants and production equipment; During the process of converting sodium products, a large amount of steam is consumed, and energy consumption is high. For every ton of zinc leaching slag processed, the steam consumption is 4 tons, equivalent to 0.5 tons of standard coal; value, it can only be used as waste residue for storage in a "rainproof, windproof, and seepage-proof" site

Method used

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  • Method for extracting indium-zinc and recovering tin from high tin high indium-zinc leaching residues

Examples

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Embodiment 1

[0018] This embodiment is an example of the method for extracting zinc indium and reclaiming tin from high-tin and high-indium zinc leaching slag according to the present invention, including the following steps:

[0019] 1. Add zinc leaching slag containing 4.6% Zn, 1.5% Sn, and 0.10% In to an 8-square-meter fuming furnace at 3 tons / hour, and simultaneously feed 1.5 tons of pulverized coal / hour and 9000 The standard cubic meter of air / hour sprays the pulverized coal into the fuming furnace at a temperature of 1230°C for fuming and volatilization to produce zinc-tin-indium fume dust and fume slag. The dust output is 0.3 tons / hour, containing Zn32% , containing Sn11.5%, containing In0.82%.

[0020] 2. Take 7 tons of zinc-tin-indium fume and carry out neutral leaching under the conditions of initial acid 70g / L, temperature 50°C, weight ratio of liquid to solid 3:1, and leaching time of 2 hours. The end point of neutral leaching is pH5. 0~5.5; 18 cubic meters of neutral leaching...

Embodiment 2

[0025] This embodiment is another example of the method for extracting zinc indium and reclaiming tin from high-tin and high-indium zinc leaching slag according to the present invention, including the following steps:

[0026] 1. Add zinc leaching slag containing 9.8% Zn, 3.5% Sn, and 0.17% In into an 8 square meter fuming furnace at 3 tons / hour, and simultaneously feed 1.5 tons of pulverized coal / hour and 9000 The standard cubic meter of air / hour sprays the pulverized coal into the fuming furnace at a temperature of 1230°C for fuming and volatilization, and the output of zinc-tin-indium fume dust and fume slag is 0.45 tons / hour, containing Zn45 %, containing Sn19.5%, containing In1.12%.

[0027] 2. The 6 tons of zinc-tin-indium fumes were neutrally leached under the conditions of initial acid 120g / L, temperature 60°C, liquid-solid ratio 4:1, leaching time 3 hours, neutral leaching end point pH5.0 ~5.5; 19 cubic meters of neutral leaching solution and 6 tons of neutral leachi...

Embodiment 3

[0032] This embodiment is another example of the method for extracting zinc indium and reclaiming tin from high-tin and high-indium zinc leaching slag according to the present invention, including the following steps:

[0033] 1. Zinc leaching slag containing 14.3% Zn, 4.7% Sn, and 0.24% In is added to a fuming furnace of 8 square meters at 3 tons / hour, and 1.5 tons of pulverized coal / hour and 9000 standard Cubic meters of air per hour, spray pulverized coal into the fuming furnace, and carry out fuming and volatilization at a temperature of 1280°C. The output of zinc-tin-indium fume and fuming slag is 0.6 tons / hour, containing Zn56% , containing Sn20.8%, containing In1.01%.

[0034] 2. Take 5 tons of zinc-tin-indium fume and carry out neutral leaching under the conditions of initial acid 165g / L, temperature 80°C, weight ratio of liquid to solid 5:1, and leaching time of 3 hours. The end point of neutral leaching is pH5.0; 21 cubic meters of neutral leaching solution and 4.5 ...

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Abstract

The invention discloses a method for extracting indium-zinc and recovering tin from high tin high indium-zinc leaching residues, comprising the following steps: fuming and volatilizing the high indium-zinc leaching residues to produce zinc-tin-indium flue dust, wherein the leaching residues comprises 4.0-15.0% of Zn, 1.0-5.0% of Sn, and 0.05-0.25% of In; carrying out neutral leaching on the zinc-tin-indium flue dust; extracting zinc from the neutral leaching solution; carrying out acid leaching on the neutral leaching residues; extracting indium from the acid leaching solution; and carrying out reduction smelting on the acid leaching residues to recover tin. According to the invention, zinc, indium and tin can be effectively separated from the high tin high indium-zinc leaching residues and can be recovered step by step, the recovery rates of zinc, indium and tin are raised, there is no three wastes (waste gas, waste water and industrial residue) pollutant emission, thus the environment is effectively protected.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal smelting, in particular to a method for extracting zinc indium and recovering tin from high-tin and high-indium zinc leaching slag. Background technique [0002] At present, the process of extracting zinc indium and recovering tin from high-tin and high-indium zinc leaching slag is as follows: hydrochloric acid leaching of high-tin and high-indium zinc leaching slag-hydrochloric acid leaching solution one-stage hydrolysis tin precipitation-hydrochloric acid leaching solution second-stage hydrolysis indium precipitation-hydrochloric acid leaching solution three-stage Hydrolysis of zinc precipitation - production of industrial sodium chloride products after zinc precipitation. This process is referred to as the "chlorination leaching-step hydrolysis" process. In this process, zinc, tin, and indium obtain a relatively high leaching rate, and then slowly add soda ash to control the pH value o...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B58/00C22B25/06C22B19/30
CPCY02P10/20
Inventor 王学洪文丕忠梁敏炎陶政修蒋光佑李德锦潘久华罗祥海韦晓岚
Owner LAIBIN CHINA TIN SMELTING