Step-by-step vacuum evaporating method for purifying lithium metal

Abstract

The invention relates to a step-by-step vacuum evaporating method for purifying lithium metal. The step-by-step vacuum evaporating method for purifying the lithium metal belongs to a metal purification method and comprises the following steps of performing vacuum filtering to remove impurities for the first time, performing vacuum purifying by distillation, performing vacuum cooling, filtering for the second time, and pouring by a pouring box to form a lithium metal solid; putting the lithium metal solid into a glove box, and sequentially demoulding, cropping, weighing and packaging to finally obtain a lithium metal finished product. Compared with the prior art, the process technology is advanced, the process is simple, the equipment is less, the investment is less, the production cycle is short, extraction is carried out in a whole-sealing vacuum environment, no pollution exists in the production process, and impurities such as potassium and sodium are collected by special equipment so as to be less. Each equipment has an independent production environment which is non-interference and convenient to observe. The equipment adopts the glove box filled with argon to package, so that the quality, the color, the purity and the performance index of the product are enabled to exceed the national standard.

Description

technical field [0001] The invention belongs to a method for metal purification, in particular to a step-by-step vacuum cavitation method for purifying metal lithium. Background technique [0002] High-purity metallic lithium is usually first extracted by electrolysis to obtain industrial-grade metallic lithium with a purity of 96% to 99%. The purification method of metallic lithium mainly uses distillation to separate impurity elements such as sodium, potassium, and other impurities from metallic lithium. , purifying industrial grade lithium into high-purity metal lithium with a percentage of 99.9% to 99.99%. Patent document CN100584972C introduces a method for purifying metal lithium by vacuum distillation. The announced content is to heat-melt crude lithium into liquid lithium in a protective medium, remove the protective medium by vacuum removal method, and then use vacuum distillation to make Volatile impurities are separated from metallic lithium, and the evaporated m...

AI Technical Summary

Problems solved by technology

Patent document CN100584972C introduces a method for purifying metal lithium by vacuum distillation. The announced content is to heat-melt crude lithium into liquid lithium in a protective medium, remove the protective medium by vacuum removal method, and then use vacuum distillation to make Volatile impurities are separated from metallic lithium, and the evaporated matter is condensed and collected to extract liquid high-purity lithium; however, the impurity removal process of a protective medium is required in this process, which increases the number of equipment, high production costs, and a short production cycle. long

[0003] Environmental pollution is a negative asset brought by modern industrial production. It may directly or indirectly affect the physiological activities of animals and plants. Environmental pollution is getting more and more attention. Traditional industries have many impurities in the process of producing high-purity lithium. There is a lot of pollution and the collection rate of impurities is low. In the industrial production process, more and more attention has been paid to the production process that has no pollution and no impact on the environment.

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