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A kind of recovery method of metallic indium

A recovery method and metal indium technology, applied in the direction of improving process efficiency, etc., can solve the problem of low purity of indium, and achieve the effect of improving the purity

Active Publication Date: 2018-10-09
河北长力环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the purity of recovered indium is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] (1) According to the mass ratio of 1.5:1, zinc slag and zinc ash are mixed with blast furnace ash, wherein the mass ratio of zinc slag and zinc ash is 1:1 to obtain a mixture with a zinc content of 40wt%, and then the Calcined at high temperature to obtain hot slag.

[0077] (2) Cool the hot slag to less than 100°C and send it to the acid leaching tank, mix the slurry with sulfuric acid solution with an initial concentration of 150g / L according to the liquid-solid ratio of 3.5:1, and control the temperature at 80°C for acid leaching After continuous leaching for 8 hours, the final acid concentration was determined to be 80g / L, and the acid leaching was completed, and the underflow filter press was used for separation by pressure filtration to obtain acid leaching solution and acid leaching filter residue.

[0078] (3) The obtained acidic leaching solution is added to the extractant according to the mass ratio of the aqueous phase and the organic phase of 4:1, wherein th...

Embodiment 2

[0085] (1) According to the mass ratio of 1.5:1, zinc slag zinc ash and blast furnace ash are mixed, wherein the mass ratio of zinc slag and zinc ash is 1:1 to obtain a mixture with a zinc content of 40wt%, and the mixing is passed through the conveyor belt Sent to the mixing ball feeding machine, the mixed material is made into a ball by the rotation of the drum, wherein the time of controlling the ball is 18min, the ball making rate is 0.94mm / min, the ball forming rate reaches 94%, and the obtained diameter is 12mm. A spherical compound with a compressive strength of 1000N / piece, a dry ball compressive strength of 20,000N / piece, and a burst temperature of 200°C. Calcination is then carried out at a temperature of 1200° C. to obtain hot slag.

[0086] (2) During the process of calcination to obtain hot slag, the transformation of zinc in the mixture to the gaseous form is realized at the same time, and the zinc oxide in the mixture is reduced to elemental zinc by CO, and then...

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Abstract

The invention provides a recovery method for metallic indium. The recovery method comprises the following steps: calcining a spherical mixed material to obtain hot slag at first, wherein the spherical mixed material comprises a first component and a second component with a mass ratio of (0.5 to 2): 1, the first component is one or two of zinc ash and zinc slag, and the second component is blast-furnace ash; then carrying out acid leaching on the hot slag through an acidic solution, carrying out solid-liquid separation to obtain an acidic leachate, extracting the obtained acidic leachate to obtain an organic phase, carrying out acid pickling, and then carrying out back extraction to obtain a back extract; and then replacing the back extract to obtain spongy indium, and then smelting the spongy indium to obtain the metallic indium. According to the recovery method provided by the invention, the mixed material is calcined, the acid leaching for the calcined hot slag is realized through the acidic solution, primary separation for indium is realized in combination with the extraction process, then the acid pickling and the back extraction are carried out to realize high enrichment for indium, and then adequate recovery for indium can be realized through the subsequent replacement process; and secondary impurity removal and purification are realized through the smelting, and the purity of the obtained metallic indium is up to 99.9wt%.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal recycling, and in particular relates to a method for recycling metal indium. Background technique [0002] Indium has the characteristics of low melting point, high boiling point, good conductivity, good ductility, and strong plasticity; indium oxides can form transparent conductive films and other characteristics. has been widely applied. Especially because indium tin oxide (ITO) has a visible light transmittance of more than 95%, an ultraviolet absorption rate of ≥70%, a microwave attenuation rate of ≥85%, good electrical conductivity and processing performance, and a film layer that is both wear-resistant and chemically resistant. Advantages, as a transparent conductive film has been widely used. With the rapid development of the IT industry, the amount of ITO targets used as transparent electrode coatings has increased sharply in various new liquid crystal displays (LCDs) such as no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B7/04C22B58/00
CPCC22B7/007C22B7/02C22B7/04C22B58/00Y02P10/20
Inventor 李国强
Owner 河北长力环保科技有限公司