Crystal form transformation method of lithium-containing aluminum electrolyte

An aluminum electrolyte and electrolyte technology, applied in the direction of aluminum halide, lithium halide, aluminum fluoride, etc., can solve the problems of insufficient extraction of lithium element, high energy consumption of electrolytic aluminum production, low purity of aluminum electrolyte, etc., and achieve the improvement of current efficiency , low extraction cost, and reduced energy consumption

Active Publication Date: 2018-01-16
NORTHEASTERN UNIV
View PDF1 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the aluminum electrolyte contains Na 2 LiAlF 6 , NaLi 2 AlF 6 , K 2 LiAlF 6 , KLi 2 AlF 6 and other insoluble lithium salts, these insoluble lithium salts are difficult to dissolve in the acid solution, therefore, the leaching

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Get 1kg of aluminum electrolyte, obtain aluminum electrolyte powder after crushing and grinding, the content of LiF in the electrolyte is 5%, the content of KF is 1%, the molecular ratio (NaF and AlF 3 The molar ratio) is 2.5:1, select the crushed and finely ground additive sodium sulfate powder, mix the aluminum electrolyte powder and sodium sulfate powder evenly through calculation, and prepare the sum of sodium fluoride, lithium fluoride and aluminum fluoride Molar ratio (LiF+NaF+KF) / AlF 3 It is a mixture of 3.8:1, roasted at 800°C for 4h in a muffle furnace, and the lithium salts in the roasted products obtained are all composed of Na 2 LiAlF 6 , K 2 LiAlF 6 , KLi 2 AlF 6 , NaLi 2 AlF 6 into soluble lithium salts LiF, Li 2 O, L i3 AlF 6 etc., the obtained lithium salt conversion rate was 97.8%.

Embodiment 2

[0045] Get 20kg of aluminum electrolyte, obtain aluminum electrolyte powder after crushing and grinding, the content of LiF in the electrolyte is 5%, the content of KF is 4%, molecular ratio (NaF and AlF 3 The molar ratio) is 2.4:1, and the crushed and finely ground additive potassium carbonate powder is selected, and the aluminum electrolyte powder and potassium carbonate powder are mixed evenly through calculation, and the sum of lithium fluoride, sodium fluoride, and potassium fluoride is prepared and Molar ratio of aluminum fluoride (LiF+NaF+KF) / AlF 3 It is a mixture of 3.5:1, roasted at 500°C for 3h in a belt roaster, and the lithium salt in the roasted product obtained is composed of Na 2 LiAlF 6 , K 2 LiAlF 6 , KLi 2 AlF 6 , NaLi 2 AlF 6 into soluble lithium salts LiF, Li 2 O, L i3 AlF 6 etc., the obtained lithium salt conversion rate was 98.2%.

Embodiment 3

[0047] Get 10kg of aluminum electrolyte, obtain aluminum electrolyte powder after crushing and grinding, the content of LiF in the electrolyte is 7%, the content of KF is 3%, molecular ratio (NaF and AlF 3 The molar ratio) is 2.6:1, select the crushed and finely ground additive sodium oxalate powder, mix the aluminum electrolyte powder and sodium oxalate powder evenly through calculation, and prepare the sum of lithium fluoride, sodium fluoride, and potassium fluoride and Molar ratio of aluminum fluoride (LiF+NaF+KF) / AlF 3 It is a mixture of 3:1, roasted at 300°C for 5h in a belt roaster, and the lithium salts in the roasted products obtained are all composed of Na 2 LiAlF 6 , K 2 LiAlF 6 , KLi 2 AlF 6 , NaLi 2 AlF 6 into soluble lithium salts LiF, Li 2 O, L i3 AlF 6 etc., the obtained lithium salt conversion rate was 95.4%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a crystal form transformation method of lithium-containing aluminum electrolyte and relates to the technical field of extraction and recycling of aluminum electrolyte. The crystal form transformation method comprises the following steps: S1, crushing the lithium-containing aluminum electrolyte; S2, mixing an additive with the aluminum electrolyte powder; uniformly mixing toobtain a mixed material, wherein the additive is one or more of alkali metal oxide except lithium, alkali metal oxysalt except the lithium, which can be transformed into alkali metal oxide under a high-temperature roasting condition, and alkali metal halide except the lithium, and the mol ratio of alkali metal fluoride in the aluminum electrolyte, alkali metal fluoride which is directly added into the additive and alkali metal fluoride which can be formed by the additive under the high-temperature roasting condition to aluminum fluoride in the mixed material is greater than 3; S3, roasting the mixed material at high temperature. According to the crystal form transformation method disclosed by the invention, insoluble lithium salt in the aluminum electrolyte can be transformed into solublelithium salt so that the leaching rate of the lithium salt is improved, the purity of the aluminum electrolyte is improved and the production energy consumption of electrolytic aluminum is reduced.

Description

technical field [0001] The invention belongs to the technical field of extraction and recovery of aluminum electrolytes, and relates to a method for changing the crystal form of lithium-containing aluminum electrolytes. Background technique [0002] The rapid development of my country's aluminum industry has led to a large consumption of bauxite resources in my country. High-grade bauxite has been scarce, and a large number of low-grade bauxite has been mined and used. This medium and low-grade bauxite contains a large amount of alkali metal elements, especially the bauxite in the main production areas of bauxite in my country has a high content of lithium salt. A large amount of alumina containing lithium salts is used as raw material for electrolytic aluminum production. This alumina is added to the electrolyte, and these lithium salts will be enriched in the aluminum electrolytic cell during use, resulting in an increase in the content of lithium salts in the aluminum el...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C25C3/18
CPCC01D15/02C01D15/04C01F7/54C22B7/00C22B26/12C25C3/18C01P2006/32Y02P10/20
Inventor 王兆文陶文举杨酉坚高炳亮刘风国
Owner NORTHEASTERN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap