Pretreatment technology for indium and germanium extraction

Abstract

The invention discloses a pretreatment technology for indium and germanium extraction. The pretreatment technology comprises the steps of melting , atomization and after-treatment, and concretely comprises the following steps: material containing In and Ge is placed in a melting pool to be melted at a temperature of 1,210-1,260 DEG C into liquid material, and the liquid material is kept at a temperature of 1,210-1,260 DEG C; the liquid material at the temperature of 1,210-1,260 DEG C flows into an atomizing chamber via a guide pipe to be atomized to obtain solid powder; the solid powder obtained by atomization is screened, and the material passing through a screen mesh is placed in a container, sealed and packed for follow-up roasting, water washing, acid treatment, drying and calcining for extraction; the material not passing through the screen mesh is returned to the melting step to circulate. The pretreatment technology provided by the invention is safe and reliable, the material granularity is low to facilitate hydrometallurgical leaching, and the recycling efficiency of In and Ge in the material is high. The pretreatment technology provided by the invention refines the material containing In and Ge by an atomizing method, not only is high in safety and low in material loss, but also is easy for processing treatment.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a pretreatment process for refining indium germanium. Background technique [0002] Indium (In) and germanium (Ge) are rare and precious metals with extremely high value. Among them, the reserves of In in the world are rare, and the content in the earth's crust is similar to that of silver, which is 1×10 -5 , but the output is only 1% of silver. So far, no single or natural indium deposit with indium as the main component has been found. At present, the minerals with industrial recovery value of indium are mainly sphalerite. The global reserves of indium are about 16,000 to 19,000 tons, and China's reserves are 13,000 tons, making it the world's largest supplier of primary indium. The supply of indium is mainly divided into primary indium and recycled indium. Tin-doped indium oxide (hereinafter referred to as IOC) target made of precious metal In and tin oxide In...

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Problems solved by technology

At present, In and Ge are extracted from materials containing In and Ge by hydrometallurgy. The biggest problem of hydrometallurgy is to dissolve the materials in acid solution. Materials containing In and Ge are difficult to compare due to the presence of a large number of vitreous substances. It is soluble in acid in large volume and needs to be finely powdered

At present, there are two refining processes. The first is the ball milling method. Generally, water is added to the ball milling method. The material contains arsenic substances. When it meets water, it will generate highly toxic arsine. Since the equipment is not sealed, it is very easy to cause the operator Poisoned and died, there is a greater risk of accidents

The second is the Raymond mill method. During the operation, there will be more viscous lead-containing materials bonded to the bottom of the equipment, causing the temperature of the equipment to be too high and unable to work normally. It must be shut down to cool down. At present, water is usually used for cooling. In the process, highly toxic arsine will be produced, and casualties will also occur. At the same time, ball milling and Raymond milling methods have large material loss, and the loss of precious metals In and Ge is large.

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