Efficient recycling method of crude zinc oxide raw material

Abstract

The invention provides an efficient recycling method of a crude zinc oxide raw material, and belongs to the field of hydrometallurgy. The method is characterized in that the crude zinc oxide raw material is leached through intermediate acid and then is subjected to ferrum, arsenic, chlorine and heavy metal removing to obtain a solution for producing a zinc ingot; the intermediate leached residuesare leached by strong acid under high temperature and then is subjected to solid-liquid separation to obtain rich lead, silver residues and strong acid leaching liquid; the high leaching liquid is returned to leach through the intermediate acid; metals such as antimony, bismuth, tin, indium and germanium in the crude zinc oxide raw material are enriched in a plurality of times through the intermediate leaching residues; ferric iron is reduced through a reducing agent in the last leaching in the intermediate acid, and the solid-liquid separation is carried out to obtain heavy metal residues; the heavy metal residues are leached through weak acid and then are subjected to solid-liquid separation to obtain low-acid leached residues, and low-acid leaching liquid rich in antimony, bismuth, tin,indium and germanium; the low-acid leached residues are leached into strong acid under high temperature so as to recover valuable metal; the weak-acid leached liquid is subjected to step type precipitation and separation to obtain antimony, bismuth and tin enriched materials and indium and germanium enriched materials; and the indium and germanium enriched materials are leached in alkali to obtain coarse indium hydroxide and germanium-enriched solution. The method is simple in processes, and high in enriching degree and recovering rate of valuable metal, and achieves efficient recycling of the crude zinc oxide raw material.

Description

Technical field [0001] The invention belongs to the field of hydrometallurgy, and specifically relates to an efficient resource utilization method of zinc hypoxide raw materials. Background technique [0002] The raw materials of zinc hypooxide mainly contain heavy metals zinc and lead, and often contain a small amount of cadmium, tin, antimony, bismuth, indium, silver, germanium and other rare metals with important uses and high value. In the past, the intermediate leaching method was used to extract zinc metal to produce zinc sulfate, zinc carbonate, active zinc oxide and other products. The recovery rate of zinc metal was relatively low. Due to the limitation of the amount of these products, the added value of the products was low. When extracting indium, the intermediate leaching residue is leached with sulfuric acid. At the same time as the indium is leached, tin, antimony, bismuth, and germanium are also leached. P204 is used to extract and recover indium. Because of the in...

AI Technical Summary

Problems solved by technology

In the past, zinc metal was extracted by middle leaching to produce zinc sulfate, zinc carbonate, active zinc oxide and other products. The recovery rate of zinc metal was low. Due to the limitation of the amount of these products, the added value of the product was low.

When extracting indium, the medium leaching residue is leached with sulfuric acid. While leaching indium, tin, antimony, bismuth, and germanium are also leached, and P204 is used to extract and recover indium. Because of the interference of tin, antimony, bismuth and other impurities, the extraction of indium The difficulty increases, the cost also rises, when the content of indium in secondary zinc oxide is less than 0.05%, the extraction of indium has become unprofitable

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