Extracting indium from indium containing materials

Indium is a rare element with unique physical and chemical properties such as low melting point, high boiling point and good conductivity. It has been widely used in high-tech fields such as electronics, energy, information and national defense. China's factories use P204 organic solvent extraction method to extract indium from smelting intermediates. The advantages are:

(1) P204 has good selectivity to indium and can extract indium from a mixture containing very low indium.

(2) The extraction enrichment ratio is up to 100 times or more.

(3) The process is simple, the operation is continuous, and it is easy to realize automation.

(4) The extraction recovery rate of indium is as high as 96~99%.

The raw materials for recovering indium from the intermediate product of vertical tank zinc smelting are:

1. Indium zinc oxide produced by coking

During the coking process, indium is volatilized with hydrocarbons into zinc oxide (containing 0.1% to 0.2% of indium and 50% to 60% of zinc). It is the most abundant raw material in the process of zinc smelting in vertical tanks, and accounts for 70%~80% of the total indium recovery.

2. Indium system acid immersion liquid

The cadmium-containing raw material contains 0.01%-0.008% of indium which is hydrolyzed at the end of the immersion, and enters the acid leaching solution during acid leaching.

3. Indium-containing crude lead by-product of zinc rectification process

In the zinc rectification, the high-boiling metal enters the lead tower melting furnace and is separated by melt separation. The indium is concentrated in the crude lead of the bottom layer, and the indium is as high as 0.5% to 1.2%.

The method of manufacturing the extract solution differs depending on the raw materials. The indium-containing zinc oxide is acid-immersed, and the silicon is precipitated. After filtering, the raw liquid is extracted, and the cadmium acid immersion liquid is precipitated by sinking silicon, and the extract is used as an extract. For the indium-containing crude lead, it is selected to be melted, blasted at 750-800 ° C, so that indium is indium oxide into the scum, crushed by a ball mill, sieved, and the obtained powdery indium oxide is leached with dilute sulfuric acid to obtain sulfuric acid. The indium solution is combined with the zinc oxide silicon to be filtered.

Product recommendation： Indium

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