Method for treating lithium-containing waste residues

A treatment method and waste slag technology, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems of unsafe treatment of metal lithium waste slag, out-of-control combustion, complicated process, etc., and achieve safety and easy recycling and treatment The effect of less time-consuming and simple method

Active Publication Date: 2018-06-01
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of high-temperature combustion is used to process lithium metal waste slag. Also due to the active nature of metal lithium, it is easy to form a hot metal sphere at high temperature, and ignites the gas (hydrogen and organic gas, etc.) produced by the reaction, so that the metal lithium waste slag There is a hidden danger of burning out of control when burning in the air, and the final lithium metal product still has a high risk, which cannot achieve the purpose of safely processing lithium metal waste residue. Disadvantages of higher consumption

Method used

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  • Method for treating lithium-containing waste residues
  • Method for treating lithium-containing waste residues
  • Method for treating lithium-containing waste residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Follow the steps below to dispose of metal lithium waste:

[0061] 1. Take the metal lithium waste slag and test its composition. The content of Li element is 62.1%;

[0062] 2. Take 10g of metal lithium waste slag and place it in a tray with a layer of stainless steel mesh, and then put it into a closed heater;

[0063] 3. After placing the metal lithium waste slag, seal the heater;

[0064] 4. Pour industrial-grade carbon dioxide (purity ≥99.2%) into the closed heater at a flow rate of 2L / min, and discharge the air in the closed heater to the gas collecting tank for recovery;

[0065] 5. After introducing carbon dioxide for 5 minutes, start to heat up the enclosed heater at a temperature increase rate of 10°C / min;

[0066] 6. Raise the temperature of the closed heater to 300°C and keep it for 30 minutes;

[0067] 7. Perform natural cooling. Increase the flow rate of industrial-grade carbon dioxide to 3L / min during the cooling process to prevent outside air from entering;

[0068] ...

Embodiment 2

[0074] Follow the steps below to dispose of metal lithium waste:

[0075] 1. Take the metal lithium waste slag and test its composition. The content of Li element is 64.3%;

[0076] 2. Take 10g of metal lithium waste slag and place it in a tray with a layer of stainless steel mesh, and then put it into a closed heater;

[0077] 3. After placing the metal lithium waste slag, seal the heater;

[0078] 4. Pour industrial-grade carbon dioxide (purity ≥99.2%) into the closed heater at a flow rate of 2L / min, and discharge the air in the closed heater to the gas collecting tank for recovery;

[0079] 5. After introducing carbon dioxide for 5 minutes, start to heat up the enclosed heater at a temperature increase rate of 10°C / min;

[0080] 6. Raise the temperature of the enclosed heater to 500℃ and keep it for 30min;

[0081] 7. Perform natural cooling. Increase the flow rate of industrial-grade carbon dioxide to 3L / min during the cooling process to prevent outside air from entering;

[0082] 8. A...

Embodiment 3

[0088] Follow the steps below to dispose of metal lithium waste:

[0089] 1. Take the metal lithium waste slag and test its composition. The content of Li element is 63.7%;

[0090] 2. Take 100g of metal lithium waste slag and place it on a tray with a layer of stainless steel mesh, and then put it into a closed heater;

[0091] 3. After placing the metal lithium waste slag, seal the heater;

[0092] 4. Pour industrial-grade carbon dioxide (purity ≥99.2%) into the closed heater with a flow rate of 10L / min, and discharge the air in the closed heater to the gas collecting tank for recovery;

[0093] 5. After introducing carbon dioxide for 10 minutes, start heating the closed heater at a heating rate of 10°C / min;

[0094] 6. Raise the temperature of the enclosed heater to 800°C and keep it warm for 60 minutes;

[0095] 7. Perform natural cooling. Increase the flow rate of industrial-grade carbon dioxide to 12L / min during the cooling process to prevent outside air from entering;

[0096] 8. Af...

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Abstract

The invention relates to a method for treating lithium-containing waste residues, and belongs to the technical field of recovery of lithium. The technical problem to be solved by the invention is to provide the method for treating lithium-containing waste residues. The method comprises the following steps: heating the lithium-containing waste residues to reach a temperature higher than 200 DEG C under the air-isolating environment, introducing treating gas, performing reaction, and transforming lithium in the lithium-containing waste residues into lithium carbonate, wherein the treating gas contains carbon dioxide. By the treatment method provided by the invention, potential safety hazard is avoided, combustible and toxic gas is not generated, and safety and environmental friendliness areachieved. Reaction is rapid and the treatment time consumption is low; and the method is simple, special equipment is not needed and the process flow is simple and convenient. The lithium-containing waste residues treated by the method have high safety performance and avoid obvious reaction with air and water; and the obtained lithium carbonate is safe and easy to recover.

Description

Technical field [0001] The invention relates to a method for processing lithium-containing waste residue, and belongs to the technical field of lithium recovery. Background technique [0002] A large amount of lithium-containing waste slag is produced during the oil refining stage of the lithium metal manufacturing process, the mass of which is about 3% of the metal lithium output, and the main components include metal lithium, potassium, sodium and their oxides, nitrides, and carbides, which is the invention The metal lithium waste residue. As a precious metal and new energy metal, metallic lithium has a high economic value. Therefore, the recycling of metallic lithium waste slag is particularly important. In the recycling process of metal lithium waste residue, the metal lithium waste residue is usually immersed in white oil. After being removed from the white oil, the surface will be evenly covered with an oil film. This oil film prevents the metal lithium from water and air ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
CPCC01D15/08
Inventor 曹乃珍邹崴刘强钟兆资徐川高洁陈欣廖仕英
Owner TIANQI LITHIUM CORP
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