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

A technology for purifying metal and metal lithium, applied in the direction of improving process efficiency, can solve the problems of low impurity collection rate, increasing the number of equipment, long production cycle, etc., to achieve the effect of simple process, quality assurance, and short production cycle

Inactive Publication Date: 2015-07-29
叶常君 +1
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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, an

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

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[0021] As shown in the figure, process engineering of the present invention is:

[0022] The metal lithium extracted by electrolysis is put into the feeding furnace 1 of the vacuum melting furnace, wherein the purity of the metal lithium is 99%. After putting it away, close the door, and continuously vacuumize the cavity of the feeding furnace 1. The temperature is 200 ℃ ~ 300 ℃, the vacuum degree is 10 -1 Pa~10 -3 Under the condition of Pa, metal lithium is melted until it melts into a liquid state; the metal lithium liquid is filtered through filter I2;

[0023] The molten metal lithium liquid enters the vacuum distillation furnace 4 through the filter I2 and the pipeline, heats and evacuates, stirs the metal lithium liquid with the stirring paddle 3, increases the surface area of ​​the liquid, and accelerates evaporation. degree is 10 -1 Pa~10 -3 Under the condition of Pa, the potassium and sodium contained in the metal lithium liquid are evaporated, and the evaporated ...

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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...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B9/04C22B9/02
CPCY02P10/20
Inventor 叶常君叶航
Owner 叶常君
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