Method for producing calcium fluoride

A production method and technology of calcium fluoride, applied in the direction of calcium/strontium/barium fluoride, calcium/strontium/barium halide, etc., can solve the problems of complex production process and high production cost, and achieve good economic value and social value , cost saving, pollution mitigation effects

Inactive Publication Date: 2008-03-05
DO FLUORIDE CHEM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional production method of calcium fluoride is flotation of natural fluorite mineral, the production process is complicated and the production cost is high

Method used

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  • Method for producing calcium fluoride

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Embodiment 1

[0018] The production method of the calcium fluoride of the present embodiment, take fluosilicic acid and calcium oxide as raw material, comprise the following steps:

[0019] (1) reacting the fluosilicic acid solution with a concentration of 15% and the calcium oxide solid for 40 minutes, after the reaction, filter to obtain the calcium fluosilicate solid;

[0020] (2) Calcium fluorosilicate is decomposed at a temperature of 300° C. for 4 hours to generate calcium fluoride solid product and silicon tetrafluoride gas;

[0021] (3) Absorb silicon tetrafluoride gas with water and hydrolyze it, filter the obtained fluorosilicic acid solution and return it to make calcium fluorosilicate, wash and dry the silicon dioxide solid to obtain white carbon black.

Embodiment 2

[0023] The production method of the calcium fluoride of the present embodiment, take fluosilicic acid and calcium oxide as raw material, comprise the following steps:

[0024] (1) reacting a 25% fluosilicic acid solution with a 30% calcium oxide slurry for 30 minutes, after the reaction, filter to obtain a calcium fluosilicate solid;

[0025] (2) Calcium fluorosilicate is decomposed at a temperature of 400°C for 3 hours to generate calcium fluoride solid product and silicon tetrafluoride gas;

[0026] (3) Absorb and hydrolyze the silicon tetrafluoride gas with water, and return the obtained fluorosilicic acid solution with a concentration of 25% after filtration to produce calcium fluorosilicate, wash and dry the silicon dioxide solid to obtain white carbon black.

Embodiment 3

[0028] The production method of the calcium fluoride of the present embodiment, take fluosilicic acid and calcium oxide as raw material, comprise the following steps:

[0029] (1) reacting a 35% fluosilicic acid solution with a 20% calcium oxide slurry for 20 minutes, after the reaction, filter to obtain a calcium fluosilicate solid;

[0030] (2) Calcium fluorosilicate is decomposed at a temperature of 500° C. for 2 hours to generate calcium fluoride solid product and silicon tetrafluoride gas;

[0031] (3) Absorb and hydrolyze silicon tetrafluoride gas with water, and return the 35% fluosilicic acid solution obtained by filtration to prepare calcium fluosilicate, wash and dry the silicon dioxide solid to obtain white carbon black.

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Abstract

The process of producing calciumfluoride with fluorosilicic acid and calcium oxide as material includes the following steps: 1. reacting fluorosilicic acid solution and calcium oxide for 10-60 min, filtering to obtain solid calcium fluorosilicate; 2. decomposing calcium fluorosilicate at 200-600 deg.c for 1-5 hr to produce solid calcium fluoride product and silicon tetrafluoride gas; and 3. absorbing silicon tetrafluoride gas with water and hydrolyzing, filtering to obtain fluorosilicic acid solution to be returned to the step 1 and solid silica, and washing and drying silica to obtain carbon white. The process utilizes fluorosilicic acid as one side product of phosphate fertilizer production as one main material, and has low cost and environment friendship.

Description

technical field [0001] The invention relates to a method for producing calcium fluoride, in particular to a method for producing calcium fluoride by using fluosilicic acid and calcium oxide as raw materials. Background technique [0002] Calcium fluoride is mainly used as raw material for hydrofluoric acid production and metallurgical flux. The traditional production method of calcium fluoride is flotation of natural fluorite minerals, the production process is complicated and the production cost is high. Contents of the invention [0003] The object of the present invention is to provide a kind of production method of calcium fluoride, to greatly reduce its production cost. [0004] In order to achieve the above object, the technical solution of the present invention is to adopt a production method of calcium fluoride, using fluosilicic acid and calcium oxide as raw materials, comprising the following steps: [0005] (1) react fluorosilicic acid solution and calcium oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/22
Inventor 李世江侯红军杨华春皇甫根利于贺华闫春生张梅
Owner DO FLUORIDE CHEM CO LTD
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