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Method for preparing indium and bismuth from coarse bismuth-containing indium

A technology of crude indium and bismuth indium, which is applied in the field of purifying rare and precious metals from rare and precious metal alloys by wet smelting, achieving the effects of low cost, small investment and wide application range

Active Publication Date: 2012-07-04
CHENZHOU FENGYUE ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no literature reports on the preparation of coarse indium and coarse bismuth from indium-bismuth alloys

Method used

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  • Method for preparing indium and bismuth from coarse bismuth-containing indium
  • Method for preparing indium and bismuth from coarse bismuth-containing indium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Raw material: 10 kg of crude indium containing bismuth: indium 95.7% bismuth 2% tin 0.2%

[0028] Auxiliary material: 10mol hydrochloric acid

[0029] Analysis of pure nitric acid

[0030] Sodium hydroxide 98%

[0031] Iron powder 88%

[0032] Zinc flake 1#

[0033] Melting: first put the crude indium in an iron pan and cover it with sodium hydroxide to melt it into a liquid metal at a temperature of 350-450°C.

[0034] Water quenching: quenching the metal liquid with water into alloy indium flower.

[0035] Dissolution: Put the alloy indium flower into a plastic bucket and dissolve it in 27 kg, 10 mol hydrochloric acid at room temperature to obtain an indium-rich solution.

[0036] Filtration: Vacuum filter the dissolved substance to obtain 26 liters of 280g / L indium solution and 3.5 kg of bismuth and indium slag.

[0037] Hydrolysis of impurities: Adjust the pH of the indium solution to 2-2.5 with sodium hydroxide to remove impurities such as ...

Embodiment 2

[0046] Raw material: 100 kg of crude indium containing bismuth: indium 92.6% bismuth 6% tin 0.25%

[0047] Auxiliary material: 10mol hydrochloric acid

[0048] Analysis of pure nitric acid

[0049] Sodium hydroxide 98%

[0050] Iron powder 88%

[0051] Zinc flake 1#

[0052] Melting: first put the crude indium in an iron pan and cover it with sodium hydroxide to melt it into a liquid metal at a temperature of 350-450°C.

[0053] Water quenching: quenching the metal liquid with water into alloy indium flower.

[0054] Dissolution: Put the alloy indium flower into a plastic reaction tank, and dissolve it in 300 kg, 10 mol hydrochloric acid at room temperature to obtain an indium-rich solution.

[0055] Filtration: Vacuum filter the dissolved substance to obtain 298 liters of 265g / L indium solution and 20kg of bismuth and indium slag.

[0056] Hydrolysis of impurities: Adjust the pH of the indium solution to 2-2.5 with sodium hydroxide to remove impuritie...

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Abstract

The invention discloses a method for extracting indium and bismuth from coarse bismuth-containing indium. The method comprises the steps of indium preparation and bismuth preparation, wherein the technological process of the indium preparation comprises melting, water quenching, dissolving, filtering, hydrolysis impurity removal, replacement and casting, and the technological process of the bismuth preparation comprises dissolving, replacement and casting. The method has the advantages that the step-by-step dissolution is adopted, the coarse indium and coarse bismuth contain fewer impurities,and the purity can reach higher than 99 percent; the cost is lower, and the direct recovery rate of indium and bismuth is high and reaches higher than 95 percent; the application range is wide, the method can be used for treating the coarse indium with the bismuth content higher than 2 percent, and the method is particularly suitable for small-scale production; and the technological process is short, treatment equipment is simple, the investment is low, and the economic benefit is considerable.

Description

Technical field [0001] The invention relates to a method for purifying rare and precious metals from rare and precious metal alloys by wet smelting, in particular to a method for preparing indium and bismuth from crude indium containing bismuth. Background technique [0002] The distribution of indium in the crust is small and very scattered, and the indium content in the crust is only 10 -5 %, there are almost no indium minerals with independent mining value in nature, and they are mostly associated with zinc, lead, tin and other metal minerals as impurity elements. my country's indium reserves rank first in the world, and the proven indium reserves co-existing with lead-zinc mines are currently about 8000t. More than 90% of indium production in the world comes from the by-products of lead and zinc smelting. [0003] Bismuth is very small in nature to form a separate bismuth in nature is very small to form a separate deposit, most of which co-exist with lead, tin, copper, tungste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B30/06C22B58/00
Inventor 曹亮发
Owner CHENZHOU FENGYUE ENVIRONMENTAL PROTECTION TECH
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