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Heap-leaching indium-extracting process for zinc distillation furnace dross

A distillation furnace and heap leaching technology, applied in the field of indium extraction, can solve the problems of pollution and less investment, and achieve the effects of high recovery rate, low investment and solving environmental protection problems.

Inactive Publication Date: 2007-05-23
锡矿山闪星锑业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the above disadvantages, to provide a simple method, low cost, less investment, which can solve the problem of highly toxic AsH 3 The gas causes harm to the staff and pollutes the environment; there are also problems that the leaching tank cannot bear when there are large metal pieces. A zinc distillation furnace scum heap leaching process for indium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take 500g of scum from zinc rectification furnace, first add 2000ml of water into the beaker, and then add concentrated H 2 SO 4 350ml, after adding sulfuric acid, add the scum of the zinc rectification furnace and carry out heap leaching. Manually stir once every 10-15 hours in heap leaching. After 60h heap leaching, it is tested that there is no AsH 3 It means that the metal Zn has basically been reflected completely. Add 150g of zinc oxide to adjust the pH to 5 to hydrolyze and precipitate indium sulfate. After filtering and separating indium and zinc, 166g of intermediate leaching residue (dry) and 2420ml of intermediate leaching solution are obtained. The results are as follows:

[0015] Middle leaching residue: In 0.74%, Zn 13.39%

[0016] Middle immersion liquid: In0.0044g / l, Zn143.55g / l

Embodiment 2

[0018] Zinc rectification furnace scum 2t, water 9m 3 , Thick H 2 SO 4 2.2t, heap leaching in a heap leaching tank, stir with compressed air during leaching, pump into the reaction tank after leaching for 75h, add secondary zinc oxide to adjust the pH to 5, hydrolyze and precipitate indium sulfate, filter and separate indium and zinc , The filtrate is used to prepare zinc sulfate, the hydrolyzed precipitate of indium sulfate is leached with sulfuric acid by conventional methods, and the recovery rate of indium leaching is 99.2%. The leaching solution is extracted and back-extracted according to conventional methods to separate indium from most of the impurities. The back-extracted indium solution is replaced with a zinc plate. Sponge indium is subjected to agglomeration, electrolysis, and melting to obtain standard indium.

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PUM

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Abstract

The disclosed heap-leaching and extracting In element technique comprises: with the rectification furnace scum in fire zinc smelting as material, selecting H2SO4 with initial concentration as 200-300g / l the v / w ratio as 4-8:1; heap leaching for 30-120h in air while holding acid concentration within 50-100g / l; absorbing the acute-toxic AsH3 by 15-25wt% CuSO4 solution and discharging the free H2 to air through a chimney; adjusting the leachate pH as 5.0-5.2 to hydrolyze and deposit the indium sulfate; filtering and separating to obtain the standard In by normal method. This invention has high leaching rate with one third cost of the distillation, and solves the problems on security and environment protection.

Description

Technical field [0001] The invention relates to a method for extracting indium from the scum of a zinc rectification furnace. Background technique [0002] The main component of the scum of the rectification furnace produced by the pyrometallurgical zinc smelting rectification furnace is metallic zinc, which generally contains 68%-78% zinc, and contains 0.18-0.35% of In, with an average value of 0.25%. The extraction of indium from this raw material can logically use the secondary zinc oxide extraction process, but due to the existence of large metal blocks that are difficult to break, leaching in a conventional agitated leaching tank will cause great wear to the equipment, and this method will also Produces highly toxic AsH 3 Gas, causing safety problems for staff and environmental pollution problems, so AsH must be added during leaching 3 Absorb equipment, resulting in large equipment investment. Therefore, the current process for extracting indium fro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/00C22B3/08C22B3/20
CPCY02P10/20
Inventor 谈应顺廖佳乐
Owner 锡矿山闪星锑业有限责任公司
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