Method for producing cryolite through fluosilicic acid waste liquid

A technology for fluorosilicic acid and cryolite, which is applied in the field of producing cryolite by using fluorosilicic acid waste liquid, can solve the problems of cumbersome preparation process of cryolite, low conversion rate, increased production cost, etc., and achieves short reaction process time and promotes reaction. , the effect of improving work efficiency

Inactive Publication Date: 2018-03-30
达州励志环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Both of the above two methods require ammoniation, and the ammoniation process makes the preparation process of cryolite cumbersome, and the conversion rate is low, which seriously increases the production cost.

Method used

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  • Method for producing cryolite through fluosilicic acid waste liquid

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Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 Shown a kind of method that utilizes fluorosilicic acid waste liquid to produce cryolite, comprises the following steps:

[0023] Step 1, the preparation of sodium fluoride solution:

[0024] 1) The fluosilicic acid waste liquid after removing impurities is made into a fluosilicic acid solution with a concentration of 12% and poured into a steel-lined plastic reactor, and then an excess of 10% soda ash is added to the steel-lined plastic reactor (soda ash purity is 98%) to form a feed liquid, stir the feed liquid and heat it to 70°C until the pH value of the feed liquid is 9; the chemical reaction formula is: H2SiF6+3Na2CO3→6NaF+SiO2+3CO2+H2O;

[0025] 2) Filtration: filter the heated feed liquid, filter out silica gel, and the filtrate is sodium fluoride solution, and then prepare the sodium fluoride solution into a sodium fluoride solution with a sodium fluoride concentration of 20%;

[0026] Step 2, the preparation of aluminum fluoride solution:

...

Embodiment 2

[0033] The difference between embodiment 2 and embodiment 1 is that the purity of soda ash is 96%, and the purity of aluminum oxide is 95%; in step one, the feed liquid is heated to a feed liquid pH value of 8.5; in step three, the fluorination The excess value of aluminum solution added is 9%, and the heating temperature is 95°C.

Embodiment 3

[0035] The difference between embodiment 3 and embodiment 1 is that the purity of soda ash is 97%, and the purity of aluminum oxide is 98%; in step one, the feed liquid is heated until the pH value of the feed liquid is 8; in step three, the fluorination The excess value of aluminum solution added is 11%, and the heating temperature is 98°C.

[0036] By adopting the invention to prepare cryolite, the quality and conversion rate of cryolite can be effectively improved, and at the same time, efficient utilization of fluosilicic acid waste liquid can be realized, waste of fluosilicic acid in fluosilicic acid waste liquid can be avoided, and while protecting the environment, Created more value for the development of the enterprise.

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Abstract

The invention discloses a method for producing cryolite through fluosilicic acid waste liquid in the technical field of cryolite preparation. The method includes the following steps of firstly, addingthe fluosilicic acid waste liquid and sodium carbonate excessive by 5-10% in a reaction still to be mixed to form material liquid, stirring the material liquid, conducting heating to 70 DEG C, and filtering out silicon dioxide silica gel after the pH value of the material liquid is 8-9 to obtain filtrate, namely a sodium fluoride solution; secondly, pouring the fluosilicic acid waste liquid and aluminium oxide of a reaction ratio in the reaction still to form a material liquid, stirring the material liquid, conducting heating to 80 DEG C, and filtering out silicon dioxide silica gel after noparticles exist in the material liquid to obtain filtrate, namely an aluminum fluoride solution; thirdly, putting the sodium fluoride solution and the aluminum fluoride solution excessive by 9-11% inthe reaction still to form mixed liquid, heating the mixed liquid to 95-100 DEG C till no grains are generated in the reaction still, filtering the mixed liquid, filtering out cryolite, adding hot water for washing, and conducting spin-drying and drying to obtain a finished cryolite product. By means of the scheme, the utilization rate of the fluosilicic acid waste liquid and the quality and yieldof the cryolite can be remarkably increased.

Description

technical field [0001] The invention relates to the technical field of cryolite preparation, in particular to a method for producing cryolite by utilizing fluosilicic acid waste liquid. Background technique [0002] Fluorosilicic acid is usually a by-product of wet-process phosphoric acid, general calcium, heavy calcium, etc. Dihydrate wet-process phosphoric acid, every ton of wet-process phosphoric acid (100% P2O5) produces about 0.06 tons of fluorosilicic acid (100% H2SiF6), and every ton of general calcium (100% P2O5) produces about 0.06 tons of fluorine Silicic acid (100% H2SiF6). my country is a big country in the production and consumption of phosphate fertilizers, and the amount of fluosilicic acid produced by the phosphate fertilizer industry in the country is astonishing. Since the fluosilicic acid produced during the production of phosphate fertilizers is mainly converted into fluosilicic acid waste liquid by being introduced into the pool, the fluosilicic acid w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/54
CPCC01F7/54
Inventor 刘泽君
Owner 达州励志环保科技有限公司
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