Method for preparing fumed silica and anhydrous hydrofluoric acid by utilizing phosphatic fertilizer by-product fluosilicate as raw material

A technology of fumed silica and anhydrous hydrofluoric acid, applied in fluorine/hydrogen fluoride, silicon oxide, climate sustainability, etc., can solve the problems of not having fumed silica, large silica particles, etc. Achieve the effect of ensuring continuous operation, reducing pressure, and eradicating hidden dangers of system damage

Inactive Publication Date: 2013-12-04
SEDIN NINGBO ENG
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Problems solved by technology

[0005] The name of the Chinese invention patent is a method for preparing hydrogen fluoride and co-producing white carbon black with silicon tetrafluoride (application number: CN201110192918.7), which discloses a method for preparing hydrogen fluoride and co-producing white carbon black with silicon tetrafluoride, and the by-product of phosphate fertilizer After the crude silicon tetrafluoride gas is dedusted and dehumidified, it undergoes a hydrolysis reaction with the reaction amount of water vapor

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  • Method for preparing fumed silica and anhydrous hydrofluoric acid by utilizing phosphatic fertilizer by-product fluosilicate as raw material
  • Method for preparing fumed silica and anhydrous hydrofluoric acid by utilizing phosphatic fertilizer by-product fluosilicate as raw material

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Embodiment 1

[0027] A method for preparing fumed white carbon black and anhydrous hydrofluoric acid with phosphate fertilizer by-product fluorosilicate as raw material, such as figure 1 shown, including the following steps:

[0028] (1) Preparation of silicon tetrafluoride: pyrolyze fluorosilicate, a by-product of phosphate fertilizer, at 300°C to obtain a gaseous silicon tetrafluoride crude product; cool the crude silicon tetrafluoride product to 75°C, and remove it through a filter After the dust is sent to the washing tower, the water and impurities contained in the silicon tetrafluoride are removed by washing with 96% concentrated sulfuric acid, and the silicon tetrafluoride product with a purity greater than 99.999% is obtained;

[0029] (2) Hydrolysis of silicon tetrafluoride: Send silicon tetrafluoride gas into the hydrolysis reactor, mix it with air and then evenly mix it with hydrogen. The volume ratio of hydrogen, air and silicon tetrafluoride is 1:2:0.2. The reaction temperatur...

Embodiment 2

[0035] A method for preparing fumed white carbon black and anhydrous hydrofluoric acid with phosphate fertilizer by-product fluorosilicate as raw material, such as figure 1 shown, including the following steps:

[0036] (1) Preparation of silicon tetrafluoride: pyrolyze fluorosilicate, a by-product of phosphate fertilizer, at 200°C to obtain a gaseous silicon tetrafluoride crude product; cool the crude silicon tetrafluoride product to 50°C, and remove it through a filter After the dust is sent to the washing tower, the water and impurities contained in the silicon tetrafluoride are removed by washing with 93% concentrated sulfuric acid, and the silicon tetrafluoride product with a purity greater than 99.999% is obtained;

[0037] (2) Hydrolysis of silicon tetrafluoride: Send silicon tetrafluoride gas into the hydrolysis reactor, mix it with air and then evenly mix it with hydrogen. The volume ratio of hydrogen, air and silicon tetrafluoride is 1:2:0.05. The reaction temperatu...

Embodiment 3

[0043] A method for preparing fumed white carbon black and anhydrous hydrofluoric acid with phosphate fertilizer by-product fluorosilicate as raw material, such as figure 1 shown, including the following steps:

[0044] (1) Preparation of silicon tetrafluoride: pyrolyze fluorosilicate, a by-product of phosphate fertilizer, at 400°C to obtain a gaseous silicon tetrafluoride crude product; cool the crude silicon tetrafluoride product to 100°C, and remove it through a filter After the dust is sent to the washing tower, the moisture and impurities contained in the silicon tetrafluoride are removed by washing with 98% concentrated sulfuric acid, and the silicon tetrafluoride product with a purity greater than 99.999% is obtained;

[0045] (2) Hydrolysis of silicon tetrafluoride: Send silicon tetrafluoride gas into the hydrolysis reactor, mix it with air and then evenly mix it with hydrogen. The volume ratio of hydrogen, air and silicon tetrafluoride is 1:2:0.3. The reaction temper...

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Abstract

The invention discloses a method for preparing fumed silica and anhydrous hydrofluoric acid by utilizing phosphatic fertilizer by-product fluosilicate as raw material. The method comprises the steps as follows: performing pyrolysis on the phosphatic fertilizer by-product fluosilicate at the temperature of 200-400 DEG C to obtain silicon tetrafluoride, utilizing a filter to remove dust containing in the silicon tetrafluoride, washing the silicon tetrafluoride by 93-98 percent of concentrated sulfuric acid to remove the moisture and impurities, mixing the silicon tetrafluoride, air with hydrogen in a hydrolysis reactor via the volume ratio of 1:2:(0.05-0.3) and performing high-temperature hydrolysis reaction, and then performing aggregation, separation, dust removal, condensation and distillation to obtain the fumed silica and the anhydrous hydrofluoric acid respectively. The method has the advantages that the technical process is simple, the raw material is easy to get, the utilization rate of the raw material is high, energy conservation and environmental protection are realized, the corrosion to the equipment is less, the production cost is reduced, and the produced white carbon black is high in purity.

Description

technical field [0001] The invention relates to a method for preparing gas-phase white carbon black and anhydrous hydrofluoric acid, in particular to a method for preparing gas-phase white carbon black and anhydrous hydrofluoric acid by using fluorosilicate, a by-product of phosphate fertilizer, as a raw material. Background technique [0002] Fumed white carbon black is white amorphous flocculent translucent solid colloidal extremely fine particles, and its chemical formula can be written as SiO 2 ·nH 2 O, the appearance is fluffy white powder, non-toxic and tasteless, insoluble in water and acid, chemically stable, high temperature resistant, non-combustible, and has high electrical insulation. Fumed silica has been widely used in many industrial fields such as rubber, paint, medicine, papermaking, etc. due to its superior stability, reinforcement, thickening and thixotropy, and has provided new opportunities for the development of many industrial fields. Material and te...

Claims

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Application Information

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IPC IPC(8): C01B33/113C01B7/19
CPCY02P20/10
Inventor 苗延军彭永红谷新春王宇光
Owner SEDIN NINGBO ENG
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