Wet processing method for tin-copper slag

Abstract

The invention relates to a wet processing method for tin-copper slag. The method comprises the following steps that sulfuric acid and the tin-copper slag are put into a closed container according to aratio, and copper chloride is added according to 2-10 wt.% of the adding amount of the tin-copper slag; then oxygen is introduced into the closed container and pressurizing and heating are carried out, so that the tin-copper slag and the sulfuric acid are fully reacted under the action of an additive; a liquid-solid mass ratio of the sulfuric acid to the tin-copper slag is 4-8:1, and an initial acidity of a sulfuric acid solution is 100-200 g / l; the reaction pressure of the closed container is 0.8-2 Mpa, the reaction temperature is 120-200 DEG C, and the reaction time is 2-8 hours; and afterthe reaction is finished, solid-liquid separation is carried out, the leaching liquid is a copper sulfate solution, a copper sulfate product is obtained after concentrating and crystallizing, and theleaching residue is tin concentrate. According to the wet processing method for the tin-copper slag, the tin and the copper can be effectively separated, so that an open way of the copper is formed ina tin smelting system, and the processing cost of the tin-copper slag is reduced.

Description

technical field

[0001] The invention belongs to the technical field of treatment methods for tin refining sulfur addition and copper removal slag. Background technique

[0002] In the tin smelting process, after the tin concentrate is reduced and smelted into crude tin, due to the presence of copper in the tin smelting raw materials, the copper content in the crude tin is relatively high. Therefore, sulfur addition and copper removal operations are required to form a Tin-copper slag (also known as sulfur slag) with 10-30% copper and 30-80% tin. Most of the tin in this slag exists in the form of metal, oxide or alloy, and most of the copper exists in the form of copper sulfide. There are mainly the following methods for the treatment of such tin-copper slag at home and abroad:

[0003] (1) Pyromelting: A certain proportion of flux is added to smelt in a short kiln to produce a semi-product of tin-copper alloy. Because a large amount of impurities in the slag enter the alloy...

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