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Method for reducing and removing nitride in lithium metal or lithium alloy

A lithium alloy and metal lithium technology, applied in the field of lithium metal, can solve the problems of inability to remove metal lithium, and achieve the effects of low cost, low residual amount and wide application.

Active Publication Date: 2017-08-18
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is only applicable to occasions where N and Ca need to be removed at the same time. If the metal lithium to be treated does not contain Ca, this method will cause a combustion reaction, and the N in the metal lithium cannot be removed.

Method used

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  • Method for reducing and removing nitride in lithium metal or lithium alloy
  • Method for reducing and removing nitride in lithium metal or lithium alloy
  • Method for reducing and removing nitride in lithium metal or lithium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 Nitrogen removal by metal lithium with excessive nitrogen content

[0044] Put 1.51 kg of battery-grade lithium metal with nitrogen content exceeding the standard in a sealed reactor, evacuate the reactor to stabilize it to <0.1Pa, and heat the material at a heating rate of 200°C / h. When the lithium metal is completely melted Stop heating and start stirring to ensure that the nitrogen content in each part of the lithium solution is evenly distributed, and then take a sample to analyze the nitrogen content in the product according to the national standard analysis method, and the measured nitrogen content is 950ppm. Add accurately weighed metal aluminum foil to the molten lithium liquid in a molar ratio of Al:N=1:1. Reheat the reactor, control the heating rate at 200°C / h, and control the reaction temperature at 220°C, and the stirring rate is 300rpm, first stir forward at 300rpm for 5-15min, then reversely stir at 300rpm for 5 minutes ~15min, cycle like this u...

Embodiment 2

[0048] Example 2 Processing Lithium Metal under the Changed Situation of Nitrogen Removal Source

[0049] The experimental method is as described in Example 1. The nitrogen removal source in the experiment is changed to obtain the treatment results under different conditions. These factors are the use of metal aluminum, metal titanium, metal zirconium or metal magnesium (the shape is all metal foil). The test arrangement is shown in Table 2, and the residual amount of nitrogen and nitrogen removal source in the lithium metal after nitrogen removal and the recovery rate of metal lithium are shown in Table 3.

[0050] Table 2

[0051]

[0052] table 3

[0053] Test No. A content (ppm) N content (ppm) Recovery rate of Li (%) 2-1 (Al)3 47 98 2-2 (Ti)4 45 98 2-3 (Zr)3 48 99 2-4 (Mg)5 50 98

Embodiment 3

[0054] Example 3 Nitrogen removal by lithium aluminum alloy with excessive nitrogen content

[0055] Put 1.78kg of lithium aluminum alloy (standard aluminum content is 3000±300ppm) whose nitrogen content exceeds the standard due to damaged packaging in a sealed reactor, feed nitrogen into the reactor, and heat the material under the protection of nitrogen. The heating rate is 200°C / h. When the alloy is completely melted, stop heating and start stirring to ensure that the nitrogen content in each part of the lithium liquid is evenly distributed. After sampling and analyzing the nitrogen content and aluminum content in the product according to the industry standard analysis method, the nitrogen content is measured. It is 467ppm, and the aluminum content is 2915ppm. Add 1.603 g of accurately weighed metal aluminum foil to the molten lithium liquid at a molar ratio of Al:N=1:1. Reheat the reactor, the heating rate is controlled at 200°C / h, and the reaction temperature is controll...

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Abstract

The invention relates to a method for reducing and removing nitride in lithium metal or a lithium alloy, and belongs to the technical field of lithium metal. According to the technical aim to be achieved, the method for reducing and removing the nitride in the lithium metal or the lithium alloy is provided. The method comprises the steps that under the vacuum or inert gas shielding atmosphere, the lithium metal or the lithium alloy is molten and stirred, then a nitrogen removing source A is added for reacting, the reacting temperature is controlled to range from 180 DEG C to 1,000 DEG C, reacting is carried out under a specific stirring method, settling and filtering are carried out after reacting is completed, and filter liquor is the lithium metal or the lithium alloy after nitrogen removing. The method is high in practicality, low in cost, short in reacting time, easy and convenient to operate and easy to achieve. The recovery rate of the lithium metal or the lithium alloy treated through the method is 98% or above, meanwhile, the active metal residual quantity is small, and the purity of the treated lithium metal or lithium alloy is not influenced; and the nitrogen content in the lithium metal or the lithium alloy can be reduced to 50 ppm or below and is far below the standard value 300 ppm in the national standard.

Description

technical field [0001] The invention relates to a method for reducing and removing nitrides from metal lithium or lithium alloy, and belongs to the technical field of lithium metal. Background technique [0002] Lithium is the lightest metal in nature, silvery white, density 0.534g / cm 3 , a melting point of 180.54°C and a boiling point of 1336°C. Since the Swedish geologist A. Arfvedson first discovered lithium in lepidolite and lepidolite in 1817, lithium has been used in glass ceramics, petrochemicals, metallurgy, aluminum smelting, textiles, synthetic rubber, and lubricating materials. , medical and other traditional fields have been widely used. In recent years, with the increase in the demand for lithium in the above-mentioned traditional fields, and the deepening of research on the development and application of lithium in high-tech fields such as nuclear power generation, aerospace, high-energy-density power batteries, and lightweight high-specific-strength alloys, ...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22C1/06
CPCC22B26/12C22C1/06
Inventor 曹乃珍徐川刘强高洁邹崴党春霞
Owner TIANQI LITHIUM CORP
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