A kind of separation method of zinc-tin alloy vacuum distillation

Abstract

The invention provides a zinc and tin alloy vacuum distillation separation method. The method includes the following steps that firstly, materials are added; secondly, vacuumizing is performed; thirdly, the temperature raising process is performed; fourthly, temperature lowering cooling is performed; fifthly, products are obtained. The temperature raising process comprises temperature raising in the first stage and temperature raising in the second stage, wherein temperature raising in the first stage includes the specific steps that temperature in a vacuum furnace is raised to 700-1100 DEG C, and the raised temperature is kept constant for 1-3 h; temperature raising in the second stage includes the specific steps that temperature in the vacuum furnace is raised to 1200-1500 DEG C, and the raised temperature is kept constant for 2-5 h. The vacuum furnace is a vertical stirring vacuum furnace. The zinc and tin alloy vacuum distillation separation method has the following advantages that the steps are simplified, the zinc proportion selection range in zinc and tin alloy raw materials is wide and is larger than 0 and smaller than 98%, the content of zinc in tin liquid can be lowered below 5 ppm, and high-purity tin can be obtained.

Description

technical field [0001] The invention relates to the technical field of vacuum smelting of nonferrous metals, in particular to a separation method of zinc-tin alloy vacuum distillation. Background technique [0002] Zinc is a non-ferrous metal with a large amount of use, and is widely used in aerospace, automobiles, ships, construction, electric power, transportation, electronics and other fields; with the scrapping of products, a large amount of zinc-containing waste is produced. Zinc-tin alloy industrial waste is a common zinc-containing raw material. In order to save resources and reduce environmental pollution, the zinc-tin alloy raw material is separated to obtain high-purity zinc and high-purity tin, which has broad market prospects. [0003] The invention patent with the patent number of 200610010855.8 discloses a method for recovering zinc and tin by vacuum distillation of zinc-tin alloy. It can process zinc-tin alloy by vacuum distillation in a vacuum smelting furnac...

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of this method is that although the content of tin in the obtained zinc metal can meet the requirements of the national standard, the content of zinc in the tin metal is still about 10%, which is far lower than the 0.001% zinc content in the 99.9% tin ingot stipulated in the national standard. Require

Due to the limitation of the temperature in the furnace, the evaporation area and the thickness of the tin liquid, when the zinc vapor is small to a certain value, it must continue to decrease, and it becomes very difficult to evaporate the zinc in the tin liquid.