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Method for extracting indium and zinc from high-iron indium-containing zinc calcine and preparing iron oxide

An iron indium zinc and iron oxide technology, which is applied in the fields of extracting indium zinc and preparing iron oxide, can solve the problems that iron cannot be utilized as resources, low recovery rate of indium, etc. Excellent indicators

Inactive Publication Date: 2013-06-12
广西冶金研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problems of low recovery rate of indium and non-resource utilization of iron in the current smelting process of high-iron indium-zinc concentrate

Method used

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  • Method for extracting indium and zinc from high-iron indium-containing zinc calcine and preparing iron oxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The method for extracting indium zinc and preparing iron oxide from high-iron indium zinc calcine of the present invention is carried out according to the following steps:

[0027] 1. The high-iron zinc calcined sand containing Zn 53.54%, Fe 19.42%, and In 0.092% is reduced in contact with CO in a rotary kiln, the reduction temperature is 870-900°C, and nitrogen gas containing 20% ​​carbon monoxide is introduced, and the excess coefficient is 1.2. Add high-iron indium-zinc calcine at a rate of 6kg / h, install a lifting plate in the kiln, and rotate the material in the kiln for 30 minutes to discharge, and the material is lowered to room temperature in the same reducing atmosphere to obtain Fe 2+ 14.96% reduced calcine, its main chemical composition is:

[0028]

Zn% Fe% Fe 2+ % In% Reduction rate% Reduced calcine 53.54 19.42 14.96 0.092 77.03

[0029] 2, the reduction calcined sand obtained is carried out neutral leaching with su...

Embodiment 2

[0036] A method for extracting indium zinc and preparing iron oxide from high-iron indium-zinc calcine, comprising the following steps:

[0037] 1. The high-iron indium-zinc calcine containing Zn50.9%, Fe20.81%, In0.10% is reduced in contact with CO in a rotary kiln, and nitrogen gas containing 10% carbon monoxide is introduced, the excess coefficient is 0.8, and the reduction temperature is 770 ~800℃, reduction time 80min, get Fe-containing 2+ 13.88% reduced calcine, the reduction rate is 66.7%.

[0038] 2. The obtained reduced calcined sand is neutrally leached with sulfuric acid, the initial acidity of neutral leaching is 120g / L, the ratio of liquid to solid (volume / weight) is 5:1, the end point of neutral leaching is pH 5.4, and the neutral leaching time is 30 min, filtered to obtain neutral leaching liquid and middle leaching residue, neutral leaching leaching rate Zn75.9%, Fe53.3%.

[0039] 3. Carry out acid leaching of the middle leaching slag, the acid leaching initi...

Embodiment 3

[0045] A method for extracting indium zinc and preparing iron oxide from high-iron indium-zinc calcine, comprising the following steps:

[0046] 1. The high-iron zinc calcine containing Zn53.2%, Fe18.98%, In0.093% is reduced in contact with CO in the rotary kiln, and nitrogen gas containing 30% carbon monoxide is introduced, the excess coefficient is 2, and the reduction temperature is 700-730 ℃, the reduction time is 60min, and the Fe-containing 2+ 15.21% reduced calcine, the reduction rate is 80.1%.

[0047] 2. The obtained reduced calcined sand is neutrally leached with sulfuric acid, the initial acidity of neutral leaching is 100g / L, the ratio of liquid to solid (volume / weight) is 5:1, and the final pH is 5.4. Slag, neutral leaching Zn leaching rate of 69.38%, iron 55.8%.

[0048] 3. Carry out acid leaching of the middle leaching residue, the acid leaching initial acidity is 200g / L, the leaching temperature is 95°C, the acid leaching terminal acidity is 50g / L, and the le...

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Abstract

The invention relates to a method for extracting indium and zinc from high-iron indium-containing zinc calcine and preparing iron oxide. A zinc ferrite structure in the high-iron indium-containing zinc calcine is damaged by reduction roasting, elements such as zinc, iron and indium in the reduced calcine are obtained by neutral leaching and acid leaching, indium-rich slag is obtained by neutralization for precipitating indium, the iron grade of slag obtained by removing iron from hematite under high pressure is high, an industrial iron oxide product can be obtained by acid washing and roasting, and liquid obtained after the iron is removed can be directly purified and electrolyzed after being neutralized by smoke. A technical route of maximally extracting base metal such as the indium, the zinc and the like and recycling associated iron minerals simultaneously is provided, and the problems that the recovery rate of the indium is low and the iron cannot be recycled in the process of smelting a high-iron indium-containing zinc concentrate at present are solved; and a clean production technology which combines effective extraction of the base metal with effective utilization of associated iron is provided for treating the indium, the zinc and other high-iron non-ferrous metal materials.

Description

technical field [0001] The invention relates to a method for extracting indium and zinc from calcine containing high iron indium and zinc and preparing iron oxide, which belongs to the technical field of mineral processing. Background technique [0002] my country's zinc smelters have carried out experimental research on processes such as hot acid leaching-jarosite method, goethite method, hematite method, and spray iron removal method. The hematite removal method is limited by the level of equipment manufacturing. In addition, several other processes have been applied in production. For example, Baiyin Northwest Smelter adopts hot acid leaching-jarosite method, Chifeng Smelter adopts ammonium ferrite method, and Wenzhou Smelter adopts spray iron removal method, etc. The hot acid leaching process has a high leaching rate and can obtain lead-silver slag with low zinc and indium content. However, the jarosite slag contains soluble ions, which is easy to cause environmental pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B3/08C22B3/44C22B19/00C22B58/00C01G49/06
CPCY02P10/20
Inventor 刘晨黄进文何航军陈科云罗思强柯剑华谢营邦李浩铭陶媛
Owner 广西冶金研究院有限公司
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