Method for separating sodium fluoride crystals from silicon dioxide

A silica and separation method technology, applied in the direction of alkali metal fluoride, silicate, alkali metal silicate, etc., can solve the problems such as the difficulty of separating sodium fluoride and silica, achieve small investment and improve utilization rate, reduce the effect of process loss

Active Publication Date: 2010-06-02
YUNNAN YUNTIANHUA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcoming that sodium fluoride is difficult to separate from silicon dioxide, and use the sodium fluorosilicate method to effectively separate silicon dioxide to produce sodium fluoride co-production wat

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  • Method for separating sodium fluoride crystals from silicon dioxide
  • Method for separating sodium fluoride crystals from silicon dioxide
  • Method for separating sodium fluoride crystals from silicon dioxide

Examples

Experimental program
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Example Embodiment

[0021] Example 1

[0022] Equipped with heating device, stirring device, concentration device, weigh 482g solid sodium carbonate, add 1100g process water to make a 30% solution, heat to 85℃, press Na 2 SiF 6 : Na 2 CO 3 =1:1.05~1.1 for batching, slowly adding 400g of solid sodium fluorosilicate, the feeding time is 30 minutes, and the reaction is continued for 30 minutes at a temperature of 93°C. Add sodium hydroxide solution, the NaOH addition amount is 35% of the theoretical amount by molar ratio. Weigh 58g solid NaOH and prepare a 50% solution, slowly add it to the above solution, and continue the reaction for 30 minutes. Filter and wash the sodium fluoride filter cake with 600g hot water to obtain a wet filter cake and dry it in an oven at 120°C for 2 hours to obtain 494g of finished sodium fluoride with a product yield of 92%. The standard analysis results of the product fully meet the GB4293-84 standard First-class product requirements.

[0023] Filtrate contains SiO 2 11.4...

Example Embodiment

[0024] Example 2

[0025] Equipped with heating device, stirring device, concentration device, weigh 482g solid sodium carbonate, add 1100g process water to make a 30% solution, heat to 85℃, press Na 2 SiF 6 : Na 2 CO 3 =1:1.05 for batching, slowly adding 400 g of solid sodium fluorosilicate, the feeding time is 30 minutes, and the reaction is continued for 30 minutes at a temperature of 93°C. Add sodium hydroxide solution, the NaOH addition amount is 35% of the theoretical amount by molar ratio. Weigh 58g solid NaOH and prepare a 50% solution, slowly add it to the above solution, and continue the reaction for 30 minutes. Filter and wash the sodium fluoride filter cake with 600g hot water to obtain a wet filter cake and dry it in an oven at 120°C for 2 hours to obtain 494g of finished sodium fluoride with a product yield of 92%. The standard analysis results of the product fully meet the GB4293-84 standard First-class product requirements.

[0026] Filtrate contains SiO 2 11.46%,...

Example Embodiment

[0027] Example 3

[0028] Equipped with heating device, stirring device, concentration device, weigh 482g solid sodium carbonate, add 1417g process water to make a 25% solution, heat up to 85℃, press Na 2 SiF 6 : Na 2 CO 3 =1:1.05~1.1 for batching, slowly adding 400g of solid sodium fluorosilicate, the feeding time is 30 minutes, and the reaction is continued for 30 minutes at a temperature of 93°C. Add sodium hydroxide solution, NaOH adding amount is 40% of the theoretical amount. Weigh 67g of solid NaOH and prepare a 50% solution, slowly add it to the above solution, and continue the reaction for 30 minutes. Filter and wash the sodium fluoride filter cake with 600g of hot water to obtain a wet filter cake and dry it in an oven at 120°C to obtain 483g of finished sodium fluoride with a product yield of 90%. The standard analysis results of the product fully reach the GB4293-84 standard level 1 Product requirements.

[0029] Filtrate contains SiO 2 12.43%, Na 2 O5.21%, density 1.1...

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Abstract

The invention relates to a method for separating sodium fluoride crystals from silicon dioxide, in particular to a method for jointly producing sodium fluoride and sodium silicate by using sodium fluosilicate which is a by product of phosphate fertilizer production. The method of the invention comprises: a, stirring a sodium fluosilicate solid and 30 to 50 percent solution of sodium carbonate with a big force to perform a reaction to obtain solution containing sodium fluoride crystals and a silicon dioxide precipitate; b, adding sodium hydroxide into the solution obtained by the step a in a theoretical dose based on a molar ratio of Na2O to SiO2 of 30 to 50 percent to dissolve the silicon dioxide to form solution of sodium silicate and the sodium fluoride crystals, wherein the concentration of the solution of the sodium hydroxide is 45 to 50 percent; c, centrifugally filtering the solution obtained by the step b, washing solid sodium fluoride, and drying the sodium fluoride to obtain a finished product of the sodium fluoride, wherein washing liquor obtained after the solid sodium fluoride is washed is used for preparing the solution of sodium carbonate; d, concentrating liquid separated by the step c, separating the precipitated sodium fluoride, and returning the solid sodium fluoride separated out to the step a; and e, concentrating the liquid sodium silicate obtained by the step b to obtain liquid sodium silicate having a standard density and a standard modulus. The method has the advantages of simple operation and control, low investment and high yield.

Description

Technical field: [0001] The invention relates to a method for separating sodium fluoride crystals and silicon dioxide, in particular to producing sodium fluoride and co-producing water glass with sodium fluorosilicate, a by-product of phosphate fertilizer. Background technique: [0002] Sodium fluoride is colorless shiny crystal or white powder, slightly soluble in alcohol, soluble in water, the aqueous solution is alkaline and can corrode glass. React with hydrofluoric acid to generate sodium bifluoride. Sodium fluoride is an important fluoride salt, mainly used as agricultural fungicide, insecticide, wood preservative, water treatment agent, light metal fluoride salt electrolytic flux. In the nuclear industry, it can be used as UF3 adsorbent and raw material for the manufacture of other fluorine compounds. It is also used in enamel, medicine, papermaking, etc. The traditional production methods of sodium fluoride mainly include neutralization method, immersion method, io...

Claims

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Application Information

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IPC IPC(8): C01D3/02C01B33/32
Inventor 明大增王煜李志祥罗运宏周秀梅陈外六杨斌
Owner YUNNAN YUNTIANHUA
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