Method for removing silver in silver-containing tin alloy by supergravity

Abstract

The invention relates to a method for removing silver in silver-containing tin alloy by supergravity, belonging to the technical field of nonferrous metal pyrometallurgy. The method comprises the steps: fully melting the silver-containing tin alloy, and then adding magnesium powder into the melted silver-containing tin alloy; introducing argon for gas protection, and conducting eccentrically mechanical stirring; after the magnesium powder is completely melted, stopping stirring; conducting centrifugal supergravity separation for a melt, and thus obtaining tin and high-silver tin and magnesiumalloy being obviously stratified. The method has the advantage of realizing effective removing of silver in the silver-containing tin alloy by supergravity and has simple process, green and environmental protection, low cost, high universality of raw materials and safe and controllable process.

Description

technical field [0001] The invention relates to a method for removing silver in a silver-containing tin alloy by supergravity, and belongs to the technical field of nonferrous metal pyrometallurgy. Background technique [0002] my country is a major producer of tin, with tin output accounting for more than 30% of the world's total output. Over the years, my country's metal tin output has continued to rank first in the world. At present, tin is mostly extracted and purified by the process of "fire smelting-fire refining-electrolytic refining". During the pyro-refining process of crude tin, most tin smelters use continuous spiral crystallizers to remove lead and bismuth to obtain crude solder. After the crude solder is vacuum distilled, most of the lead and bismuth with low vapor pressure and boiling point volatilize and enter condensation Lead-bismuth alloy is formed in the material, and the high-boiling silver remains in the residue to form crude tin, which will return to t...

AI Technical Summary

Problems solved by technology

This method cannot obtain silver with higher purity, and the silver extraction effect is poor

In the patent with the publication number CN101033557, the zinc-silver alloy is melted and poured into an alloy block, and placed in an electrolytic cell equipped with an ion-exchange membrane for electrolysis. Hydrometallurgy inevitably has the disadvantages of serious pollution and high power consumption.

This method can only handle lead-free solder, and cannot handle high-lead solder

In the patent with the publication number CN102828042A, the treatment method for the silver-zinc shell in the crude tin is to use a centrifuge to separate it. The capital investment cost is high, and the temperature control is difficult. The silver-zinc shell is inevitably dissolved in the crude tin again, and the silver is extracted High silver content in post-crude tin

In the patent with the publication number CN 104928491A, zinc is added to silver-tin alloy to form slag and charcoal is floated up, and the purpose of tin-silver separation is achieved after being removed. Not high, and the density of zinc is not much different from that of tin. A large amount of zinc will remain in tin, which is not easy to remove by slag removal

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