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Method for leaching indium from leaching residue containing indium

A leaching slag and leaching technology, which is applied in the field of extracting indium from difficult-to-handle indium-containing slag, can solve the problems of high energy consumption, limited improvement of indium leaching rate, incomplete decomposition, etc., and achieve the effect of reducing the content of indium

Inactive Publication Date: 2011-04-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process can effectively reduce the loss of valuable metals, and the production processes are paralleled to complement each other; however, the decomposition of insoluble substances such as zinc ferrite is still not complete, and the improvement of indium leaching rate is still limited. , higher energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The calcine of high-indium sphalerite in a factory was subjected to three-stage countercurrent leaching, jarosite iron precipitation, and rotary kiln volatilization and enrichment to obtain indium-containing zinc oxide soot. Then three-stage leaching is used to treat zinc oxide soot, and indium is extracted from the low-acid leaching solution, enriched and recovered. However, the slag after the third high-temperature and high-acid leaching still contains relatively high indium, and its chemical composition (mass fraction, %) is as follows: In 0.69, Zn 8.54, Sn 6.32, Pb 6.77, Fe 13.28, Bi 0.633, Sb 1.11, As 1.0, SiO 2 8.75.

[0014] Take 500% indium-containing high leaching residue, the amount of industrial concentrated sulfuric acid is 5 times (482.5mL) of the theoretical consumption (96.5mL), stir evenly in a reaction vessel, and place it at room temperature for 3 days; 100g / L, using water as the leaching agent at a temperature of 25°C for 3 hours, so that the indiu...

Embodiment 2

[0016] A factory uses a rotary kiln to volatilize antimony blast furnace slag to obtain zinc oxide soot containing indium, lead, and antimony. It uses sulfuric acid neutralization leaching, low-acid leaching, and high-temperature high-acid leaching to recover indium. Because a large amount of indium is wrapped, the leaching of indium The rate is only 50-60%. The chemical composition (mass fraction, %) of the leaching residue is as follows: In 0.54, Zn23.62, Sb 23.25, Pb 14.87, Fe 0.70, Sn 8.61, As 0.16.

[0017] Take 100 grams of indium-containing leaching residue, the amount of industrial concentrated sulfuric acid is 4 times (82.20mL) of the theoretical consumption (20.55mL), stir evenly in a reaction vessel, and place it at room temperature for 14 days; after aging, use water as a leaching agent, according to the solid-liquid ratio of 300g / L, leaching at a temperature of 40°C for 2 hours, so that indium and zinc in the indium-containing leaching residue enter the leaching s...

Embodiment 3

[0019] The calcine of sphalerite containing indium in a factory, after medium leaching, low acid leaching and high temperature high acid leaching, the obtained slag still contains relatively high indium, and its chemical composition (mass fraction, %) is as follows: In 0.072, Zn 6.88 , Sn 4.32, Pb 5.76, Fe 22.42, Bi 0.85, Sb 0.87, As 0.45, SiO 2 10.2.

[0020] Weigh 1000 grams of indium-containing high leaching residue, the amount of industrial concentrated sulfuric acid is 1.5 times (565.1mL) of the theoretical amount (376.7mL), stir evenly in the reaction vessel, and place it at room temperature for half a year; after aging, use water as the leaching agent , with a solid-to-liquid ratio of 200g / L, leaching at a temperature of 90°C for 1 hour, so that the indium and zinc in the high-indium-containing leaching residue enter the leaching solution in the form of sulfate. Separation by filtration and washing. The slag contains 0.021% indium and 1.29% zinc. During the leaching ...

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Abstract

The invention relates to a method for leaching indium from leaching residue containing indium, which comprises the following steps: sulphuric acid low-acid leaching residue or high-temperature high-acid leaching residue containing indium is taken as a raw material and aged by industrial concentrated sulfuric acid under the normal temperature more than three days, and the aged leaching residue containing indium is added with water and dissolved and leaches the indium for 1-3 hours under the condition that the solid-to-liquid ratio is 100g to 300g / L and the temperature is 25-90 DEG C; the solution is returned to the low-acid leaching process for recovering the indium after filtering, separating and washing, and other valuable metals can be recovered from the residue. After the leaching residue containing indium is aged, indium, zinc and iron which are contained in the leaching residue enter into lixivium in the form of water-soluble sulphate, the elements of lead, antimony, tin, bismuth, and the like are remained in the leaching residue and enriched, and the leaching rate of the indium is larger than 90 percent.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy of nonferrous metals, and relates to a method for extracting indium from refractory indium-containing slag by adopting an industrial concentrated sulfuric acid aging-water immersion method. technical background [0002] Indium is a rare element with very little content and scattered distribution in the earth's crust. In nature, it mostly coexists with minerals such as zinc, lead, copper and tin with similar properties. Therefore, the enrichment and extraction process of indium in the smelting process is particularly important. At present, the enrichment and extraction of indium from indium-containing slag includes sulfuric acid leaching, sulfated roasting-water immersion method, chlorination volatilization method, vacuum distillation method, etc. For lead scum reverberatory furnace smoke, use sulfuric acid two-stage leaching (Liu Langming. China Nonferrous Metallurgy, 2004, (3): 28), di(2-ethylhexyl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B58/00C22B3/08
CPCY02P10/20
Inventor 杨声海陈耿涛陈进中唐谟堂何静唐朝波杨建广王亦男
Owner CENT SOUTH UNIV
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