Trentment method of tin copper slag

Abstract

The invention relates to a tin copper scale fire wet method combining treatment method. It can use simple technique to produce top stannous sulfate product. The tin copper scale is a high tin low copper middle material, packed by tin and copper. The invention combines tin copper scale treatment and stannous sulfate preparing, adopts respectively two segment atmospheric pressure leaching method for copper sulfate test and sulfuric acid solution to effectively separate copper from the tin copper scale, and gain high quality tin fine mineral product, copper sulfate product and stannous sulfate product.

Description

technical field [0001] The invention belongs to a treatment method for removing copper slag from tin refining, and in particular relates to a fire-wet combined treatment method for tin-copper 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 copper-containing Tin-copper slag (also known as sulfur slag) with a tin content of 10-30% and a tin content of 30-80%. Most of the tin in this slag exists in the form of metal, oxide or alloy, and most of the copper is in the form of copper sulfide (Cu 2 S) form exists. 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 t...

AI Technical Summary

Problems solved by technology

[0003] (1) Pyromelting: A certain proportion of flux is mixed in a short kiln for smelting to produce semi-products of tin-copper alloy. Due to the large amount of impurities in the slag entering the alloy, it is difficult to further process the alloy product

[0004] (2) Roasting-leaching method: After the tin-copper slag is roasted, sulfuric acid is used to leaching the calcine, so that copper is opened from the tin smelting system in the form of copper sulfate products. This method has a low softening point of the tin-copper slag due to the existence of a large amount of metallic tin. , it is necessary to carry out multi-stage roasting to achieve the purpose of roasting without kiln formation and desulfurization, so that the roasting time is very long and the processing cost is high

Due to the existence of powdery copper sulfide in this method, the direct recovery rate of tin during electrolysis is low, and the current efficiency is low, resulting in poor economic benefits.

[0006] (4) Full wet process: Some researchers have conducted research on the full wet process of tin-copper slag, which is to decompose the tin-copper slag with hydrochloric acid, so that all the components in the slag enter the solution, and then carry out the treatment of each element in the solution. The separation of the method makes the process lengthy and complicated.

Images