Multi-metal recycling method of electric furnace tin-smelting dust

Abstract

The invention discloses a multi-metal recycling method of electric furnace tin-smelting dust. The method comprises the following steps: electric furnace tin-smelting dust is placed in a reaction kettle, sulfuric acid or / and raffinate are added to perform neutral leaching so that metals such as zinc are leached in the neutral solution and indium, tin and lead are left in residues; the neutral residues are placed in a reaction kettle, concentrated sulfuric acid is added for cure leaching, cleaning solution is added after the reaction to ensure that indium and a part of tin are leached in the solution and most of tin and lead are left in residues; extractant P204 is used to extract the indium and tin of the leachate and separate indium and tin from zinc, hydrochloric acid is used to perform backextraction to the extract so that tin and indium can be separated from the organic phase through backextraction and high concentration indium-tin mixed backextraction solution can be obtained; tributyl phosphate (TBP) extractant is used to extract tin to obtain material solution with indium and material solution with tin; and the material solution with indium is replaced by using a zinc plate and casted to obtain crude indium, the crude indium is electrolyzed and purified to obtain a refined indium product. The method combines the mature concentrated acid curing technology, extraction technology and other technologies into a whole, solves the separation problem of indium and tin and ensures that various high-value metals in the electric furnace dust can be recycled efficiently, continuously and largely; and the actual indium yield is more than 80% and the purity of the refined indium is more than 99.93%.

Description

technical field [0001] The invention belongs to a method for recovering polymetallic dust from tin smelting in an electric furnace. Background technique [0002] In the production process of tin smelting in electric furnaces, the dust generated by the dust removal treatment of the flue gas produced by electric furnaces still contains valuable metals such as tin, lead, zinc, indium, etc. Due to technological and technical reasons, smelting enterprises have not yet solved the problem of recovering these valuable metals from such refractory electric furnace smelting dust and realizing effective comprehensive utilization, and the level of resource utilization is not high. [0003] In particular, it should be pointed out that, as one of the indispensable key raw materials, indium has a wide range of uses in the fields of electronics, telecommunications, optoelectronics, national defense, communications, etc., and has a very strategic position; its value is several times that of c...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is exactly to above-mentioned problem, proposes a kind of electric furnace tin smelting flue dust polymetallic recovery method, makes this method process brief, production cost is low, can improve the recovery rate of indium greatly, especially will solve the solution containing indium and tin Difficulties in extraction and separation of indium and tin, in order to achieve the purpose of comprehensively utilizing various metals in electric furnace dust and improving the level of resource utilization

Images