Method for refining pure metal

Abstract

The invention discloses a method for refining pure metal, which comprises the following steps: firstly, performing preliminary purification on crude metal by adopting an electrolytic method; and secondly, performing evaporation purification on the metal after the preliminary purification in a special device. The evaporation purification comprises the following steps: vacuumizing a purification furnace first, and introducing liquid metal into a purification crucible in the purification furnace through a pipeline and a stop valve by using the air pressure difference between the purification furnace and a heating furnace; controlling the temperature and the vacuum degree in the purification furnace to evaporate, volatilize and remove low-boiling impurity elements first; and then controlling the temperature of the furnace to evaporate and volatilize the desired metal to further obtain the purified metal through condensation and collection. The method has simple purification process and good purification effect, and can be widely applied to purifying metals and nonmetals.

Description

1. Technical field [0001] What the present invention relates to is a kind of refining pure metal method 2. Background technology [0002] At present, high-purity metals, as a high-tech product, are in great demand in domestic and foreign markets, and are showing an increasing trend year by year, and have broad development prospects. As far as the country is concerned, the annual demand of electronics, artificial crystals, chemicals, machinery and other industries is as high as 350 tons. At present, my country mainly uses the segregation method to purify metals. During purification by segregation method, when the crystal continues to grow further, the precipitated elements accumulate in the remaining liquid phase, which increases the concentration at the front of the solid-liquid interface. Simply relying on natural convection or forced stirring, it is impossible to segregate during the purification process. The impurity elements that come out are completely removed, and th...

AI Technical Summary

Problems solved by technology

During purification by segregation method, when the crystal continues to grow further, the precipitated elements accumulate in the remaining liquid phase, which increases the concentration at the front of the solid-liquid interface. Simply relying on natural convection or forced stirring, it is impossible to segregate during the purification process. The impurity elements that come out are completely removed, and the result is that the purification rate or removal rate is low, and the purification effect is poor