Preparation method of aluminum fluoride for aluminum electrolytic cell

A technology of aluminum electrolytic cell and aluminum fluoride, which is applied in the field of metallurgy, can solve problems affecting lithium sinking links and waste of resources, and achieve the effects of promoting stable production, high recovery rate, and wide application range

Inactive Publication Date: 2020-09-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For the recycling of waste lithium-rich potassium-aluminum electrolytes, Chinese patent specification CN105293536A chose inorganic acid leaching during the treatment process, Chinese patent specification CN105543504B chose roasting pretreatment before inorganic acid leaching, and patent 201910609881X chose heat treatment before inorganic acid leach

Method used

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  • Preparation method of aluminum fluoride for aluminum electrolytic cell
  • Preparation method of aluminum fluoride for aluminum electrolytic cell

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Embodiment 1

[0028] The preparation method of aluminum fluoride for aluminum electrolytic cell, the method specifically includes the following steps:

[0029] Step 1: Add 200ml of 0.5M NaOH to 1000ml of lithium-rich potassium-aluminum electrolyte leaching solution to adjust Al in the leaching solution 3+ :F - :OH - =1:1.67:1.25. The reaction was stirred at 70°C for 45 minutes, and filtered to obtain 10.53 g of aluminum hydroxyfluoride.

[0030] Step 2: The filtered aluminum hydroxyfluoride is calcined at 500° C. for 1 h to obtain 8.52 g of aluminum fluoride.

Embodiment 2

[0032] The preparation method of aluminum fluoride for aluminum electrolytic cell, the method specifically includes the following steps:

[0033] Step 1: Add 300ml 0.8M KOH to 1200ml lithium-rich aluminum electrolyte leaching solution to adjust the Al in the leaching solution 3+ :F -: OH - =1:1.55:1.45. The reaction was stirred at 50°C for 60 minutes and filtered to obtain 23.15 g of aluminum hydroxyfluoride.

[0034] Step 2: The filtered aluminum hydroxyfluoride is calcined at 450° C. for 2 hours to obtain 16.73 g of aluminum fluoride.

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Abstract

The invention relates to a preparation method of aluminum fluoride for an aluminum electrolytic cell. The preparation method comprises the following steps of adding alkali into a lithium, aluminum andpotassium-enriched electrolyte leaching solution to adjust the PH; controlling proportion of Al3<+>, F<-> and OH<-> to carry out a precipitin reaction to obtain a certain amount of precipitate, wherein the reaction temperature is 20-110 DEG C and the reaction time is 20-120 min; and calcining the obtained precipitated product for 1-3 hours at 350-650 DEG C to obtain anhydrous aluminum chloride. By adding alkali and controlling the proportion of Al3<+>, F<-> and OH<-> to obtain hydroxyl aluminum fluoride and calcining the hydroxyl aluminum fluoride to obtain aluminum fluoride, more than 90wt%of Al3<+> and F<-> can be recovered simultaneously to the highest extent. In the process, other impurities are not introduced, and the alkali metal loss rate is low. The preparation method is simple to operate, makes preparation for follow-up lithium precipitation and is low in treatment cost.

Description

Technical field [0001] The invention relates to a method for preparing aluminum fluoride for aluminum electrolytic cells, and belongs to the field of metallurgy. Background technique [0002] my country’s bauxite is mainly distributed in Shanxi, Henan, Guangxi, Guizhou and other places. Alumina is produced from bauxite. As an important raw material for electrolytic aluminum, the consumption of alumina is increasing. my country’s original small high-quality bauxite The mine is nearly exhausted, and most companies have to mine and use a large amount of low- and medium-quality bauxite to produce alumina. However, alumina produced from low- and medium-quality bauxite contains many impurity elements, such as Li and K. The lithium content of the alumina produced in many regions exceeds 0.03%. Generally speaking, the alumina content of more than 0.03% is called lithium-rich alumina. According to relevant investigations and studies, the domestic lithium-rich alumina production accounts f...

Claims

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Application Information

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IPC IPC(8): C22B21/00C22B7/00C25C3/18
CPCC22B7/006C22B21/0023C25C3/18Y02P10/20
Inventor 吕晓军邹忠王维维
Owner CENT SOUTH UNIV
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