Technology for recycling indium from zinc oxide material with high fluoride and chlorine contents and removing fluorine, chlorine and arsenic from raffinate

Abstract

The invention relates to a technology for recycling indium from a zinc oxide material with high fluoride and chlorine contents and removing fluorine, chlorine and arsenic from a raffinate. The technology comprises the steps that a by-product, namely an indium-containing zinc oxide material which is produced after smelting is added with water to pulpify, added with sulfuric acid for leaching and filter pressing, a primary filtrate is extracted and back-extracted through utilizing an organic phase, and indium in the filtrate enters an organic phase liquid; copper slag and copper sulfate are added into the raffinate, and a dechlorinated liquid is obtained after heating and stirring; lime is added into the dechlorinated liquid, and when the pH value of the liquid is controlled between 4-5 under the stirring condition, a liquid which is removed with the fluorine and arsenic is obtained. The technology can be utilized to remove the fluorine, the chlorine and the arsenic in a wet method, and valuable metals such as the indium and zinc in the smelting by-product, namely the indium-containing zinc oxide material is reasonably recycled through utilizing the technology, so that the pollution of the zinc smelting by-products to water, air and soil is eliminated, the use value of a zinc oxide material is increased, the production cost is saved, the production environment is improved, and the environmental pollution is reduced.

Description

technical field [0001] The content of the invention belongs to the technical field of mineral production, processing and comprehensive utilization, and relates to a comprehensive recovery and utilization process applied to the valuable metal indium and zinc in the by-product zinc oxide material in zinc smelting production. Background technique [0002] In the zinc smelting production process, the by-product zinc oxide material not only contains a relatively high amount of metal zinc (Zn), but also contains a certain amount of valuable metals such as indium (In). However, due to raw material factors, the content of fluorine (F), chlorine (Cl), and arsenic (As) in this by-product zinc oxide bag dust is also relatively high (Note: high fluorine and chlorine content means that the fluorine content is higher than 0.5%, and the content of Chlorine is higher than 1%), and cannot directly enter the zinc smelting system for leaching so that the zinc and indium can be recovered. At p...

AI Technical Summary

Problems solved by technology

However, due to raw material factors, the content of fluorine (F), chlorine (Cl) and arsenic (As) in this by-product zinc oxide bag dust is also relatively high (Note: high fluorine and chlorine content means that the fluorine content is higher than 0.5%, and the content of Chlorine is higher than 1%), cannot directly enter the zinc smelting system for leaching so that the zinc and indium can be recovered

At present, large and medium-sized smelters in this field generally use a rotary kiln or multiple furnaces to defluorinate and chlorine, and then recycle zinc and indium. This process not only requires a large investment , and high energy consumption, large pollution, can not achieve the purpose of comprehensive recycling