Method for opening path for antimony in tin smelting by combining pyrogenic process with wet process

Abstract

The invention discloses a method for opening a path for antimony in tin smelting by combining a pyrogenic process with a wet process. The method for opening the path for antimony in tin smelting by combining the pyrogenic process with the wet process comprises the following steps: refining crude tin and adding aluminum to remove aluminum slag generated by arsenic and antimony, smelting by an electric furnace and then generating high-antimony crude tin, then removing iron, arsenic and copper, then carrying out vacuum distillation, and separating to obtain vacuum crude tin and a tin-lead-antimony alloy; carrying out electrolytic refining on the vacuum crude tin to obtain a fine tin product with a tin content of not less than 99.9wt.%; and then carrying out vacuum distillation on the tin-lead-antimony alloy, and separating to obtain secondary vacuum crude tin and a lead-antimony alloy. According to the method for opening the path for antimony in tin smelting by combining the pyrogenic process with the wet process, the high-antimony crude tin generated through the electric furnace smelting for the aluminum slag is subjected to the combined treatment of vacuum distillation and electrolytic refining to generate the product fine tin which meets the product standards, and the path is opened for antimony which is enriched into the aluminum slag in a tin smelting flow from the tin smelting flow in a manner that most of antimony exists in the form of a lead-antimony alloy and a small amount of antimony exists in the form of refined anode slime, so that the circulation amount of antimony in the tin smelting flow is effectively reduced; and meanwhile, the circulation amount of tin in the refining process is reduced, and tin is recovered in an economic manner.

Description

technical field [0001] The invention belongs to the technical field of tin smelting, and in particular relates to a combined pyrotechnic and wet process, which adopts vacuum distillation and electrolytic refining to jointly process high-antimony crude tin, so as to realize the method of tin smelting antimony open circuit. Background technique [0002] In the tin smelting industry, it has always been a problem to get the impurity antimony out of the tin smelting process in an economical and environmentally friendly way. In the tin refining process, antimony is generally removed by adding aluminum particles to form high-melting aluminum-antimony compounds to obtain aluminum slag with higher tin content. In the past, when the amount of antimony-containing and low-aluminum slag in the raw material was small, the aluminum slag was usually smelted to produce tin-antimony alloys, which were then purified and sold as tin-based bearing alloys. However, in recent years, due to the in...

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Problems solved by technology

However, in the patent description, due to the high content of antimony in the anode, the anode slime rate is higher, both above 20%, and a large amount of tin is also brought into the anode slime, and the final product obtained is crude tin, which needs to be returned Pyrorefining

Although antimony can be removed into the anode slime in one step, the product needs further treatment due to the large amount of anode slime, and its economic efficiency is not ideal.

[0005] The above methods of treating high-antimony crude tin simply by vacuum distillation (fire method) or electrolytic refining (wet method) cannot economically and efficiently recover tin and open the antimony for large-scale tin smelters, so it is necessary to find a solution An Antimony Open Circuit Method Combining the Advantages of Vacuum Distillation and Electrolytic Refining

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