Process for preparing kryocide

A cryolite and product technology, applied in the field of cryolite production, can solve problems such as environmental pollution, high production costs, and different degrees, and achieve the effects of alleviating environmental pollution, good social value and economic value, and reducing dependence

Inactive Publication Date: 2008-12-10
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional production process of cryolite is fluoroaluminic acid soda ash method, as well as clay brine method, sodium fluorosilicate method and sodium hydrofluoric acid aluminate method, etc. These methods all need to occupy certain fluorine resources, the production cost is high, and There are different degrees of environmental pollution problems in the current process

Method used

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  • Process for preparing kryocide
  • Process for preparing kryocide
  • Process for preparing kryocide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The production method of the present invention is as follows: use a jaw crusher or a hammer crusher to break the solid electrolyte block into small pieces of 30mm, and store them in the silo for later use; add the broken electrolyte block to a high-temperature melting furnace at 950°C , to generate molten electrolyte solution; the electrolyte solution is extracted with a vacuum extraction device to separate the solid waste from the pure electrolyte solution; after the electrolyte solution is cooled, it becomes an electrolyte block; the electrolyte block and sodium bifluoride are finely ground by a Raymond mill Finally, mix evenly according to the mass ratio of 4:1, put it into a high-temperature calcination furnace, and carry out a calcination reaction at a temperature of 550° C. to generate cryolite.

Embodiment 2

[0020] The production method of the present invention is as follows: use a jaw crusher or a hammer crusher to break the solid electrolyte block into small pieces of 40 mm, and store them in the silo for later use; add the broken electrolyte block into a high-temperature melting furnace at 1000 ° C, Generate molten electrolyte; use a vacuum extraction device to extract the electrolyte to separate the solid waste from the pure electrolyte; the electrolyte is cooled to form an electrolyte block; the electrolyte block and sodium hydrogen fluoride are finely ground by a Raymond mill, Mix evenly at a mass ratio of 6:1, put into a high-temperature calciner for calcining reaction at a temperature of 350° C., and generate cryolite.

Embodiment 3

[0022] The production method of the present invention is as follows: use a jaw crusher or a hammer crusher to break the solid electrolyte block into small pieces of 50 mm, and store them in the silo for later use; add the broken electrolyte block into a high-temperature melting furnace at 1100 ° C, Generate molten electrolyte; use a vacuum extraction device to extract the electrolyte to separate the solid waste from the pure electrolyte; the electrolyte is cooled to form an electrolyte block; the electrolyte block and sodium hydrogen fluoride are finely ground by a Raymond mill, Mix evenly according to the mass ratio of 8:1, put into a high-temperature calciner to carry out calcining reaction at a temperature of 150° C., and generate cryolite.

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Abstract

The invention relates to a method for producing cryolite, which takes electrolyte blocks of aluminum factories and sodium bifluoride as raw materials which are then reacted with each other in a solid phase. The method adopts a great deal of waste residue of the electrolytic aluminum factories - the electrolyte blocks as the raw materials, thereby the method increases a source of raw materials for producing villiaumite, relieves the dependency on fluorite, saves a large number of valuable resources, has low cost, greatly reduces the production cost, and relieves the ambient environmental pollution problem. Moreover, products generated during the reaction process of the method can be recycled, thereby the method greatly reduces the production cost to a certain degree, has good social benefit and economic benefit, and is easy to promote and apply.

Description

technical field [0001] The invention relates to a method for producing cryolite, in particular to a method for producing cryolite by using electrolyte and sodium bifluoride in the electrolytic aluminum industry as raw materials. Background technique [0002] Cryolite is an alkali metal fluoroaluminate, also known as sodium fluoroaluminate, its molecular formula is Na 3 AlF 6 ; Natural cryolite is a monoclinic prismatic crystal, colorless, due to the influence of impurities, it is often off-white, light yellow or reddish, sometimes black. Often present as an inseparable dense block with glass luster, slightly soluble in water, acidic reaction, and decomposes when it meets sulfuric acid. As a chemical product, cryolite is mainly used as a flux for smelting metal aluminum, and can also be used as an insecticide for crops, an enamel opalescent agent, a sunscreen and flux for glass and enamel production, and a wear-resistant filler for resin rubber. , can also be used in the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/54
Inventor 皇甫根利刘海霞闫春生张金保张良
Owner DO FLUORIDE CHEM CO LTD
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