Method for extracting valuable metals and refining zinc sulphate monohydrate from zinc-containing waste material

Abstract

The invention discloses a method for extracting valuable metals and refining zinc sulphate monohydrate from zinc-containing waste material. The method comprises the steps of refining the zinc sulphate monohydrate and extracting cadmium, lead, indium and other valuable metals, wherein the technology for refining the zinc sulphate monohydrate comprises the steps of: acidification, oxidization, zinc replacement, concentration, drying, packaging and the like; the technology for extracting cadmium comprises the steps of: acidification, oxidization, replacement, cadmium residue rinsing and the like; the technology for extracting lead comprises the steps of: acidification, oxidization, primary rinsing, secondary rinsing and the like; the technology for extracting indium comprises the steps of: acidification, oxidization, primary rinsing, secondary rinsing, extraction, back extraction, indium replacement, electrolysis and the like; and the extracted raffinate can be added into the next circulation to be recycled. Thus the zinc sulphate monohydrate and the valuable metals such as cadmium, lead and indium can be obtained, the process is simplified, the production cost is reduced, and the method is convenient for operation, simple in technology and high in recovery rate. The method has the advantages of low cost and energy consumption, etc.

Description

technical field [0001] The invention relates to a metal extraction method, in particular to a method for extracting valuable metals from zinc-containing waste and refining zinc sulfate monohydrate. Background technique [0002] With the increasing frequency of production activities such as mining, dressing, smelting and chemical industry of non-ferrous metals, the amount and types of industrial waste generated have greatly increased. The discharge and storage of industrial waste not only takes up a lot of land, but also contains lead , Cadmium and other toxic heavy metals pose a great pollution and threat to the environment. At present, our mineral resources are in short supply and the situation is severe. Zinc and cadmium contained in industrial waste slag have increasingly become a secondary resource with development and utilization value, and another metal indium is a rare element in the earth's crust, which itself cannot be independently ore-formed. , but very dispersed...

AI Technical Summary

Problems solved by technology

[0003] The traditional recovery methods include traditional wet leaching, cremation and smelting, etc., which have the disadvantages of complex impurity removal industry, low recovery rate, and high process energy consumption. Zinc powder needs to be added in the recovery process, which has the disadvantages of high cost. In the pulverization process, ball milling is used. Crush the materials to the same size and mix them, which has the disadvantages of complex process and high energy consumption that requires additional equipment costs

Images