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A method for preparing high-purity calcium fluoride from calcium fluoride sludge

Calcium fluoride and calcium fluoride technology are applied in the direction of calcium/strontium/barium fluoride, calcium/strontium/barium halide, etc., which can solve the problems of shortage of fluorine resources, achieve simple process, broad market application prospects, The effect of solving the shortage of fluorine resources

Active Publication Date: 2022-05-10
HEFEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention can effectively dispose of calcium fluoride sludge, prepare high-purity calcium fluoride, solve the problem of shortage of fluorine resources, have good economic and environmental benefits and broad market application prospects

Method used

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  • A method for preparing high-purity calcium fluoride from calcium fluoride sludge
  • A method for preparing high-purity calcium fluoride from calcium fluoride sludge
  • A method for preparing high-purity calcium fluoride from calcium fluoride sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Sludge drying: Put the calcium fluoride sludge into the oven to dry thoroughly, then ball mill it with a ball mill and sieve it with a 200-mesh sieve to obtain the undersize A;

[0028] 2. Sludge acidification: Weigh 10 g of the above-mentioned undersize material A and mix it with 60 mL of 2.0 mol / L hydrochloric acid solution, and stir it to react to obtain a solid-liquid mixture B;

[0029] 3. Filtration: Filter and sieve the solid-liquid mixture B with different filter cloths to obtain filter residue C and filtrate D;

[0030] 4. Centrifugation: The filtrate D was subjected to centrifugation washing, the centrifugation speed was 5000r / min, the centrifugation time was 15min, and the number of times of deionized water washing was 3 times to obtain the precipitate E;

[0031] 5. Alkali leaching to remove silicon: Weigh 8.7375g solid sodium hydroxide and add deionized water to dissolve to make 50mL sodium hydroxide solution with a mass fraction of 15%; weigh 10g of the...

Embodiment 2

[0034] 1. Sludge drying: Put the calcium fluoride sludge into the oven to dry thoroughly, then ball mill it with a ball mill and sieve it with a 200-mesh sieve to obtain the undersize A;

[0035] 2. Sludge acidification: Weigh 10 g of the above-mentioned undersize material A and mix it with 53.33 mL of 1.5 mol / L hydrochloric acid solution, and stir it to react to obtain a solid-liquid mixture B;

[0036] 3. Filtration: filter and sieve the solid-liquid mixture B with filter cloths of different meshes to obtain filter residue C and filtrate D;

[0037] 4. Centrifugation: The filtrate D was subjected to centrifugation washing, the centrifugation speed was 5000r / min, the centrifugation time was 15min, and the number of times of deionized water washing was 3 times to obtain the precipitate E;

[0038] 5. Alkali leaching to remove silicon: Weigh 12.191g of solid sodium hydroxide and add deionized water to dissolve to make 50mL of sodium hydroxide solution with a mass fraction of 20...

Embodiment 3

[0041] 1. Sludge drying: Put the calcium fluoride sludge into the oven and dry it thoroughly, then use a ball mill to grind it and sieve it with a 200-mesh sieve to obtain the undersize A;

[0042] 2. Sludge acidification: Weigh 100g of the above-mentioned undersize A and mix it with 600mL 2.0mol / L hydrochloric acid solution, and stir it evenly, dissolve the alkaline precipitate, and obtain a solid-liquid mixture B;

[0043] 3. Filtration: Filter and sieve the solid-liquid mixture B with different filter cloths to obtain filter residue C and filtrate D;

[0044] 4. Centrifugation: The above-mentioned filtrate D is subjected to centrifugation washing, the centrifugation speed is 5000r / min, the centrifugation time is 15min, and the number of times of deionized water washing is 3 times to obtain the precipitate E;

[0045]5. Alkali leaching to remove silicon: Weigh 7.5g of solid sodium hydroxide and add deionized water to dissolve to make 50mL of sodium hydroxide solution with a ...

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Abstract

The invention discloses a method for preparing high-purity calcium fluoride from calcium fluoride sludge. The calcium fluoride sludge is put into an oven for drying, then ball milled by a ball mill and sieved to obtain the undersize A; a certain amount is obtained A, add a certain amount of acid solution and stir to react to obtain a solid-liquid mixture B, filter through filter cloths of different meshes to obtain filter residue C and filtrate D, centrifuge the above filtrate D to obtain precipitate E; take a certain amount of Add sodium hydroxide solution to the precipitate E, filter to obtain calcium fluoride and filtrate F, dry and pulverize the calcium fluoride to obtain powdery high-purity calcium fluoride. The invention can effectively dispose calcium fluoride sludge, prepare high-purity calcium fluoride, solve the problem of shortage of fluorine resources, and has good economic and environmental benefits and broad application prospects.

Description

technical field [0001] The invention belongs to the field of calcium fluoride sludge treatment in the photovoltaic industry, and in particular relates to a method for preparing high-purity calcium fluoride from calcium fluoride sludge. Background technique [0002] my country's photovoltaic industry is developing rapidly, and its market share accounts for more than 50% of the world. The generated fluorine-containing wastewater is neutralized by calcium oxide or calcium hydroxide to produce a large amount of calcium fluoride sludge, of which calcium fluoride accounts for more than 40%. The main component of calcium fluoride sludge is CaF 2 , CaCO 3 , Ca(OH) 2 , CaSO 4 , SiO 2 , CaSiO 3 and sand and other impurities. Calcium fluoride has low toxicity and is slightly soluble in water. Improper disposal will cause secondary fluorine pollution, resulting in excessive fluorine content in surface water and other hazards. Therefore, the disposal of calcium fluoride is very ur...

Claims

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Application Information

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IPC IPC(8): C01F11/22
CPCC01F11/22C01P2002/72C01P2006/80
Inventor 王百年陈义雯常道春杨保俊张告时都晓俊
Owner HEFEI UNIV OF TECH
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