Method for preparing villiaumite and lithium salt by using high-lithium electrolyte

A technology of electrolyte and lithium salt, which is applied in the field of aluminum electrolyte recycling, can solve the problems of low molecular ratio of recycled cryolite, low electrolyte molecule, shrinking cryolite market demand, etc., and achieve the effect of high recovery rate and large market demand

Pending Publication Date: 2021-07-30
ZHENGZHOU JINGWEI TECH & IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Chinese patent CN108569711A discloses a method of extracting lithium salt from high-lithium electrolyte waste in aluminum electrolysis to prepare lithium carbonate. The high-lithium electrolyte is dissolved by sulfuric acid wet method. The purified electrolyte cannot be directly returned to the electrolytic cell for use due to its low molecular weight. ; Chinese patent CN105543504A discloses a method for extracting lithium salt in aluminum electrolyte by fluoridation roasting and acid leaching, using wet acidification to dissolve the electrolyte, and the regenerated cryolite and lithium carbonate obtaine

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  • Method for preparing villiaumite and lithium salt by using high-lithium electrolyte
  • Method for preparing villiaumite and lithium salt by using high-lithium electrolyte
  • Method for preparing villiaumite and lithium salt by using high-lithium electrolyte

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Example Embodiment

[0041] Example 1

[0042] This embodiment provides a method of preparing fluorine salts and lithium salts using high lithium electrolytes, including:

[0043] A 100 kg of particles and 80 kg of aluminum sulfate were added to 300 mesh, and then mixed with a 150 kg of mass fraction of 5% sulfuric acid to be uniformly mixed, and the electrolyte particles were prepared. NA 3 Alf 6 76%, NA 5 Al 3 Fly 14 The content is 8%, the LIF content is 8%, C content 2%, CAF 2 3.2%, Al 2 O 3 The content is 2.8%; the mixed slurry of the feedstock is not smashed to a particle size of less than 120 μm, and inserted into the rotary furnace, calcined by 2 h at 500 ° C, and then add 320 kg of pure water, wet to less than 200 mesh, filtered after filter residue 0.0 ° C dry, resulting in a 75 kg fluorine salt mixture; an XRD semi-quantitative analysis method was used to detect the ingredients of the fluorine salt mixture. figure 2 As shown, the main component of the fluorine salt mixture is NA 3 Alf 6 NA 5...

Example Embodiment

[0046] Example 2

[0047] This embodiment provides a method of preparing fluorine and lithium salts using a high lithium electrolyte, comprising: first picking 1000 kg of particles of less than 25 mm, 1000 kg of octave, aluminum sulfate, and aluminum, mixed, mixed to 400 mesh, The raw material mixed slurry is made uniformly mixed with 1200 kg of mass fraction of 30% of sulfuric acid, wherein the electrolyte particles comprise Na. 3 Alf 6 Included 80%, NA 5 Al 3 Fly 14 The content is 6%, the LIF content is 4%, C content 2.5%, CAF 2 Content 2.5%, Al 2 O 3 The content is 5%; the mixed slurry of the feedstock is not less than 150 μm, and the rotary furnace is injected into the rotary furnace, and the calcination of 600 ° C is calcined. After cooling, the pure water is added to less than 200 mesh, and the filtered filter is dried at 500 ° C. The 780 kg fluorine salt mixture was obtained, and the ingredients of the fluorine salt mixture were detected by XRD semi-quantitative analysis me...

Example Embodiment

[0050] Example 3

[0051] This embodiment provides a method of preparing fluorine and lithium salts using a high lithium electrolyte, including electrolyte particles having a 500 kg of particle size of less than 25 mm, 350 kg sulfate and 350 kg of aluminum sulfate, mixed grinding to 400 mesh Further, it is uniformly mixed with a 50% sulfuric acid solution having a 250 kg mass fraction of 50%, wherein the electrolyte particles comprise Na. 3 Alf 6 74% content, NA 5 Al 3 Fly 14 The content is 7%, the LIF content is 10%, C content 2.5%, CAF 2 3.2%, Al 2 O 3 The content is 3.3%; the mixed slurry of the raw material is not less than 150 μm, and the rotary furnace is injected into the rotary furnace, and 1 H is calcined at 550 ° C. After cooling, add 1500 kg of pure water, wet grinding to less than 200 mesh, filtered after filter residue It was dried at 550 ° C to give 315 kg of fluorine salt mixture, and the ingredients of the fluorine salt mixture were detected by XRD semi-quantitativ...

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Abstract

The invention provides a method for preparing villiaumite and lithium salt by using a high-lithium electrolyte, which comprises the following steps: uniformly mixing a high-lithium electrolyte, a sulfate and a sulfuric acid solution to obtain raw material mixed slurry; carrying out atomization treatment on the raw material mixed slurry, and then carrying out calcination treatment to prepare a calcined product; carrying out water washing treatment on the calcined product to obtain villiaumite filter residues and lithium-containing filtrate; drying the villiaumite filter residues to prepare villiaumite for electrolytic aluminum; and treating the lithium-containing filtrate to prepare the lithium salt. According to the method, fluorine and lithium in the high-lithium electrolyte can be recovered and converted into villiaumite and lithium salt with high additional values, and the recovery rate is high. In addition, the villiaumite and the lithium salt prepared by the method provided by the invention have large market demands, no waste, waste water or waste gas is discharged in the technological process, and the method is environment-friendly and pollution-free.

Description

technical field [0001] The invention relates to the technical field of recycling aluminum electrolytes, in particular to a method for preparing fluorine salts and lithium salts using high-lithium electrolytes. Background technique [0002] During the production of electrolytic aluminum, alumina and fluoride salts need to be supplemented regularly. A small amount of lithium oxide in alumina is converted into lithium fluoride or lithium cryolite in the electrolytic cell and gradually enriched. The content of lithium salts such as lithium fluoride and lithium cryolite can be as high as 4% to 12%, forming a high-lithium electrolyte. High-lithium electrolytes will reduce the solubility of alumina in it, and will increase the superheat of the electrolyte and increase energy consumption. , shorten the service life of the electrolytic cell. Usually, after the lithium salt is enriched to a certain extent, the electrolyte needs to be replaced, and the replaced high-lithium electrolyt...

Claims

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Application Information

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IPC IPC(8): C01F7/54C01F7/50C01D15/08C01D7/00C01D5/00
CPCC01F7/54C01F7/50C01D15/08C01D5/00C01D7/00C01P2002/72C01P2006/80C01P2004/80
Inventor 冯晓强于长军牛文军李伟华张敬一
Owner ZHENGZHOU JINGWEI TECH & IND
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