Method for producing sodium fluoride from lithium source lithium extraction waste liquid and method for co-producing sodium fluoride and potassium fluosilicate

A technology of potassium fluorosilicate and sodium fluoride, which is applied in the field of waste liquid treatment of lithium extraction from lithium sources, can solve the problems of low development and utilization value of associated resources and difficult disposal of waste liquid, and achieve good economic and environmental benefits, reducing Emissions, the effect of saving production costs

Inactive Publication Date: 2016-02-03
韩甜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for producing sodium fluoride by using the lithium extraction waste liquid from lithium sources, so as to solve the pr...

Method used

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  • Method for producing sodium fluoride from lithium source lithium extraction waste liquid and method for co-producing sodium fluoride and potassium fluosilicate
  • Method for producing sodium fluoride from lithium source lithium extraction waste liquid and method for co-producing sodium fluoride and potassium fluosilicate
  • Method for producing sodium fluoride from lithium source lithium extraction waste liquid and method for co-producing sodium fluoride and potassium fluosilicate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The method for producing sodium fluoride and co-producing potassium fluorosilicate by utilizing lithium source to extract lithium waste liquid of the present embodiment comprises the following steps:

[0052] 1) Add 1000g of crude lithium extracted from salt lake (crude lithium compound prepared by salt lake) to 5000g of water (the mass ratio of liquid to solid is 5:1), stir at room temperature for 5h to make a slurry, filter, wash to obtain 585g of lithium concentrate, and combine The filtrate and washing liquid are used to extract lithium waste liquid; the obtained lithium concentrate is used to prepare high-purity lithium compounds; the Na+ mass concentration in the obtained lithium extraction waste liquid is 14.5%;

[0053] 2) 5415g, containing Na + Add 1g of sodium ethylenediaminetetraacetate as a complexing agent to the lithium extraction waste liquid with a mass concentration of 14.5% (the mass ratio of the complexing agent to the impurity metal ions in the lithi...

Embodiment 2

[0059] The method of using the lithium source to extract lithium waste liquid of the present embodiment to produce sodium fluoride and co-produce potassium fluorosilicate, such as figure 1 shown, including the following steps:

[0060] 1) Add 1000g of crude lithium extracted from salt lake (crude lithium compound prepared by salt lake) to 5000g of water (the mass ratio of liquid to solid is 5:1), stir at room temperature for 10h to make a slurry, filter, wash to obtain 940g of lithium concentrate, and combine The filtrate and washing liquid are used to extract lithium waste liquid; the obtained lithium concentrate is used to prepare high-purity lithium compounds; the Na+ mass concentration in the obtained lithium extraction waste liquid is 7%;

[0061] 2) Concentrate 5060g of the lithium extraction waste liquid containing Na+mass concentration of 7% obtained in step 1) under a negative pressure of less than 0.1MPa and 40°C, concentrate 2615g of evaporated water until the Na+ma...

Embodiment 3

[0068] The method for producing sodium fluoride and co-producing potassium fluorosilicate by utilizing lithium source to extract lithium waste liquid of the present embodiment comprises the following steps:

[0069] 1) add water (the mass ratio of liquid to solid is 1:1) to the crude lithium extracted from salt lake (the crude lithium compound prepared from salt lake), stir for 15 hours to make a slurry, filter, wash to obtain lithium concentrate, and combine the filtrate and washing liquid to obtain Lithium extraction waste liquid; the obtained lithium concentrate is used to prepare high-purity lithium compounds; the Na+ mass concentration in the obtained lithium extraction waste liquid is 10%;

[0070] 2) Concentrate the lithium extraction waste liquid containing 10% Na+ mass concentration obtained in step 1) under a negative pressure of 0.06MPa and 60°C until the Na+ mass concentration is 15%, and then filter at 60°C to obtain Lithium extraction waste liquid concentrate and...

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Abstract

The invention discloses a method for producing sodium fluoride from a lithium source lithium extraction waste liquid and a method for co-producing sodium fluoride and potassium fluosilicate. The method for producing sodium fluoride comprises adding water into a lithium source lithium extraction crude product to obtain pulp, filtering the pulp to obtain a lithium extraction waste liquid, adding a complexing agent into the lithium extraction waste liquid or lithium extraction waste liquid concentrate, carrying out a reaction process to obtain a mixture, adding HF into the mixture according to a mole ratio of Na<+> to HF of 1: 1.05-1.1, carrying out a reaction process to obtain sodium fluoride pulp, carrying out filtration to obtain a sodium fluoride product, adding fluosilicic acid into the filtrate obtained by sodium fluoride pulp filtration, carrying out a reaction process to obtain potassium fluosilicate pulp and filtering the potassium fluosilicate pulp to obtain a potassium fluosilicate product. A lithium source lithium extraction waste liquid is used as a raw material, and lithium source concomitant metal ions are transformed into high-quality and high-added value fluoride so that a lithium source concomitant resource utilization rate is improved, resource waste is prevented, a production cost is saved, lithium extraction waste liquid discharge is reduced and good economic benefits and environment benefits are obtained.

Description

technical field [0001] The invention belongs to the technical field of treatment of lithium waste liquid extracted from lithium sources, and specifically relates to a method for producing sodium fluoride by using waste liquid extracted from lithium sources, and also relates to a method for producing sodium fluoride and co-producing fluorine by using waste liquid extracted from lithium sources to produce sodium fluoride Potassium silicate method. Background technique [0002] Lithium (Li), silver-white metal, known as "rare metal", density 0.534g / cm 3 , with a melting point of 180.54°C and a boiling point of 1317°C. It is the lightest metal and can react with a large number of inorganic and organic reagents. Because of its special properties, it is known as "the energy metal of the 21st century". As "industrial monosodium glutamate", the product uses span the lithium industry chain of many cutting-edge industries, such as military industry, new energy industry, metallurgical...

Claims

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Application Information

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IPC IPC(8): C01D3/02C01B33/10
Inventor 韩甜
Owner 韩甜
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