Method for leaching, enriching and reclaiming indium from lead-zinc smelting by-product zinc oxide

Abstract

The invention discloses a method for leaching, enriching and recovering indium from zinc oxide byproduct in the lead and zinc smelting process. The invention is implemented by the following technical proposal: by using three-step leaching process and adding oxidizing agent in the leached slurry, the problem of low indium leaching rate is solved; intermittent slag feeding mode is used to prevent the over-high acidity due to the leached strong acids and the excessive iron production and thus to avoid the production of indium-conjugated jarosite in the next preneutralization process, which may influence the recovery of indium; the high-acidity solution is neutralized with a neutralizer such as zinc oxide or zinc calcine, so that the problem of high-acidity solution disposal is solved; when the low-acidity and high-acidity leach slurry are fed into the concentration machine, the compound flocculant is added to solve the technical problems of difficulty in settlement clarification of ore slurry, poor fluidity of thickened underflow and serious hardening. With this method, the indium leaching rate is increased up to 70-80 percent and the recovery rates of indium and zinc are also increased. Additionally, the method allows the disposal of lead-containing materials (lead slag) in the lead system and helps to reduce the discharge of waste slag, gas and water, protecting the environment.

Description

technical field [0001] The invention relates to a production method of indium, in particular to a method for leaching, enriching and recovering indium from zinc oxide, a by-product of lead-zinc smelting. Background technique [0002] Metal indium does not have a separate mineral in nature, it is accompanied by lead, zinc, tin and copper ore, and the content is very small. The content of indium in metal ores is generally a few parts per ten thousand. The extraction process of indium can generally be divided into four stages, one is to enrich indium in its main metal extraction process; the other is to prepare indium enrichment; the third is to produce crude indium through a series of chemical metallurgical processes; The fourth is to obtain refined indium ingots by electrolysis of crude indium. There are mainly the following ways to extract indium in the current prior art: one is to extract indium from the leaching residue of zinc hydrometallurgy, which is the most important...

AI Technical Summary

Problems solved by technology

The three-stage leaching process has been reported in the literature (see the article "Development of Zinc Hydrometallurgy Technology in China" Liu Jiefeng, [Title] Hunan Nonferrous Metals, Issue 03, 2001), but it is still in the laboratory stage or semi-industrial test stage. In industrial production, there are still technical problems such as difficulty in liquid-solid separation of high-acid leaching slurry, poor fluidity of high-acid dense underflow, serious hardening, and difficult treatment of indium-containing high-acid solution. The industrial production process has not been successfully tested and is not practical. Can not be popularized and applied, and industrialized production has not been realized

Images