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Method for producing calcium fluoride by bottom sludge generated during treatment of industrial fluoride-containing wastewater

A technology of calcium fluoride and sediment, applied in chemical instruments and methods, sludge treatment, calcium/strontium/barium fluoride, etc., can solve the problems of affecting the environment, insufficient utilization of calcium hydroxide, waste of fluorine resources, etc.

Inactive Publication Date: 2013-08-07
BEIFANG UNIV OF NATITIES
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Problems solved by technology

The advantages of this method are low cost and easy operation; the disadvantage is that the generated calcium fluoride precipitate will wrap on the surface of calcium hydroxide particles, so that calcium hydroxide cannot be fully utilized, thus producing a large amount of sediment
At present, there is no better way to deal with the sediment, but to stack it in the open air, which not only takes up land, but also affects the environment, resulting in a serious waste of fluorine resources.

Method used

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  • Method for producing calcium fluoride by bottom sludge generated during treatment of industrial fluoride-containing wastewater
  • Method for producing calcium fluoride by bottom sludge generated during treatment of industrial fluoride-containing wastewater
  • Method for producing calcium fluoride by bottom sludge generated during treatment of industrial fluoride-containing wastewater

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Embodiment Construction

[0037] primary acidification

[0038] Combine the filtrate obtained from the secondary acidification and the washing water produced after washing the filter cake, mix and stir with the bottom sludge in the primary acidification reactor at room temperature, stop stirring when the pH of the slurry is close to neutral, and let it stand For 3-5 minutes, the slurry in the upper part of the reactor is drawn out and suction filtered, and the filtrate is reserved for washing the filter cake after the secondary acidification, the filter cake is deprecipitated and transformed, and the sand is left in the primary acidification reactor. After the amount is too much, it will be discharged for centralized processing;

[0039] precipitation transformation

[0040] Na at a concentration of 2% 2 CO 3 Put 500ml of the solution into a plastic reactor, place the reactor in a water bath at 50°C, and add 500 grams of acidified bottom sludge into the reactor at a stirring speed of approximately 1...

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Abstract

The invention relates to a method for producing calcium fluoride by bottom sludge generated during treatment of industrial fluoride-containing wastewater. Calcium fluoride in the bottom sludge is obtained through combination of hydrochloric acid, sodium carbonate and caustic soda and two-time acidification seperation. The method has the advantages of solving the land occupation problem of bottom sludge generated during treatment of industrial fluoride-containing wastewater, effectively utilizing fluorine resources in the bottom sludge and providing calcium fluoride products with utilization value.

Description

technical field [0001] The invention relates to a production method of calcium fluoride, in particular to a method for producing calcium fluoride from bottom mud produced by treating industrial fluorine-containing wastewater. Background technique [0002] Calcium fluoride is mainly used as a raw material for the production of hydrofluoric acid and a metallurgical solvent. In order to meet the discharge standards, industrial fluorine-containing wastewater needs to undergo defluoridation treatment. The currently widely used method for reducing fluoride is the lime chemical precipitation method, that is, adding lime to fluoride-containing wastewater to combine fluoride ions with calcium ions to form calcium fluoride precipitates that are insoluble in water and remove them. The advantages of this method are low cost and easy operation; the disadvantage is that the generated calcium fluoride precipitate will wrap on the surface of calcium hydroxide particles, so that calcium hyd...

Claims

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Application Information

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IPC IPC(8): C01F11/22C02F11/00
Inventor 谢明
Owner BEIFANG UNIV OF NATITIES
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