Method for processing roasted sand containing iron, indium and zinc through hot-pressing selective leaching

A selective, zinc calcination technology, applied in the field of hydrometallurgy, can solve the problems of long process flow, low recovery rate, large waste gas treatment volume, etc., and achieve the effect of reducing costs and simple source of raw materials

Inactive Publication Date: 2014-03-19
广西冶金研究院有限公司
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Problems solved by technology

At present, the process has the following problems: (1) The recovery rate of zinc and indium is low, the recovery rate of zinc is 92%, and the recovery rate of indium is 70%. In addition, it is difficult to use iron in the concentrate; Iron, the ferrite slag produced needs to be volatilized in the rotary kiln to recover zinc and indium, the process is lengthy, the production cost is high, and the waste gas treatment capacity is large

Method used

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  • Method for processing roasted sand containing iron, indium and zinc through hot-pressing selective leaching

Examples

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Effect test

no. 1 example

[0019] The first example of the method for hot-pressing selective leaching treatment of iron-containing indium-zinc calcine according to the present invention comprises the following steps:

[0020] Raw materials: high-iron indium-zinc calcine containing Zn52.1%, Fe19.41%, In0.057% somewhere in Guangxi.

[0021] Step 1: The temperature of the rotary kiln is 900°C, zinc calcined sand is mixed with 10% coal powder, and then put into the closed rotary kiln. Lifting plates are installed in the kiln, and the material is rotated in the kiln for 75 minutes to discharge, and the material drops to 100°C in the same reducing atmosphere After that, the reduced zinc calcine is obtained, and the reduction of ferric iron to ferrous iron reaches 92.6%.

[0022] Step 2: The obtained reduced calcine is mixed with an acidic solution, the sulfuric acid content of the acidic solution is 160g / L, the mass ratio of the input reduced calcine to the acidic solution is 1:6, the two are stirred evenly a...

Embodiment 2

[0027] Another example of the method for hot-pressing selective leaching treatment of iron-containing indium-zinc calcine according to the present invention comprises the following steps:

[0028] Raw materials: Calcined sand contains Zn43.8%, Fe22.9%, In0.078%.

[0029] Step 1: Use a rotary kiln to reduce zinc calcine, the temperature of the rotary kiln is 800°C, the amount of reduced coal is 15%, the reduction is 90min, and the reduction rate of ferric iron is 93.8%.

[0030] Step 2: Reducing calcination and mixing with acid solution, the acid solution contains 180% sulfuric acid, the mass ratio of solid to liquid is 1:6, mix well and add to the autoclave.

[0031] Step 3: The reduced calcined sand is subjected to hot-press selective leaching in an autoclave. The leaching rates are: Zn98.9%, Fe8.6%, In94.2%, to obtain 32.8% of iron slag, and the grade of iron in iron slag is 56.1%.

[0032] Step 4: Smoke and dust pre-neutralization, the pre-neutralization end point is 1.5, ...

Embodiment 3

[0035] Another example of the method for hot-pressing selective leaching treatment of iron-containing indium-zinc calcine according to the present invention comprises the following steps:

[0036] Raw materials: Calcined sand contains Zn46.0%, Fe18.02%, In0.049%.

[0037] Step 1: Use a rotary kiln to reduce the zinc calcine, reduce the amount of coal to 8%, reduce the temperature to 850°C, and reduce for 45 minutes to obtain a reduced calcine with a reduction rate of 82.5%.

[0038] Step 2: Reducing calcination and mixing with acid solution, the acid solution contains 180g / L of sulfuric acid, the mass ratio of solid to liquid is 1:5, mix well and add to the autoclave.

[0039] Step 3: The reduced calcine is subjected to hot-press selective leaching in an autoclave. The hot-press reaction temperature is 180°C, the reaction pressure is 1.6Mpa, the leaching solution contains 83.7g / L of zinc, 67mg / L of indium, and 0.62g / L of iron. It is Zn98.8%, In83.2%, Fe1.91%, 38.7% of iron sl...

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Abstract

The invention discloses a method of processing a material containing iron, indium and zinc through hot-pressing selective leaching. According to the method, ferric iron in zinc roasted sand is converted into ferrous iron by using reducing roasting; hot-pressing acidic selective leaching is carried out on reduced roasted sand in a autoclave; zinc and indium elements are leached out under high-temperature acidity condition and enter into a solution; since the pH value of the iron becomes negative in the case of hydrolysis in a high-temperature environment, iron is converted into hematite to be retained in leaching residue; leaching liquid is pre-neutralized and precipitates out indium, thus obtaining a zinc sulfate solution and indium residue; neutralization residues return to a rotary kiln to be subjected to reducing roasting together with the zinc roasted sand. By adopting the method, selective leaching of zinc, indium and iron of the roasted sand containing zinc, indium and iron is realized when the roasted sand is leached; the leaching rate of the indium is improved, and the cost of extracting the indium in the zinc roasted sand is reduced. The amount of powdered coal needed in the reducing roasting of the roasted sand is small, and the reducing atmosphere in a reducing roasting process is easily realized. The method can be applied to treatment of indium, zinc and other iron-containing non-ferrous metal materials.

Description

technical field [0001] The invention relates to a method for selectively leaching calcine containing iron, indium and zinc by hot pressing, and belongs to the technical field of hydrometallurgy. Background technique [0002] The raw materials mainly come from the indium-containing high-iron-zinc calcine in mining areas of Guangxi, Yunnan and Hunan. The main components are: Zn42-52%, Fe10-20%, In500-1000g / t. In order to adapt to the characteristics of high iron content and high value of indium in zinc calcine, considering the comprehensive utilization of associated indium in zinc calcine, the main process flow of zinc extraction is: neutral leaching, low-acid leaching, hot acid leaching, and ferrite precipitation. iron, indium, etc. Extraction of indium from alum slag adopts the production process of rotary kiln volatilization, leaching, extraction, replacement, and electrolysis. At present, the process has the following problems: (1) The recovery rate of zinc and indium is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B3/08C22B58/00
CPCY02P10/20
Inventor 罗思强何航军刘晨罗东明蓉蓉陶媛陈科云黄强罗朝巍刘泽张湘钰唐海明陈小雁覃辉平
Owner 广西冶金研究院有限公司
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