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Method for preparing gas-phase SiO2 and recovering HF by one-step pyrolysis of fluosilicic acid

A fluorosilicic acid, gas phase technology, applied in fluorine/hydrogen fluoride, chemical instruments and methods, hydrogen fluoride and other directions, can solve the problems of difficulty in producing fumed silica, product performance does not meet requirements, environmental pollution, etc., and achieves a simple and environmentally friendly preparation method. , the effect of fine particle size and high purity

Pending Publication Date: 2020-12-08
HUANGGANG NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing deep processing technology is complicated, the investment is large, the environmental pollution is serious, the industrialization is difficult to produce, or the performance of the obtained fumed silica product does not meet the requirements.

Method used

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  • Method for preparing gas-phase SiO2 and recovering HF by one-step pyrolysis of fluosilicic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Taking the 30% by-product fluosilicic acid produced by a phosphate fertilizer company in Hubei as an example to illustrate the process of the present invention, the fluosilicic acid solution can be purified first according to the needs of producing products with different purity and quality.

[0028] 1. Adjust the concentration of fluosilicic acid:

[0029] Turn on the ventilation switch and acid mist absorption system of the acid mixing kettle 008, send the fluosilicic acid solution with a room temperature of -5 degrees and a concentration of 30% into the acid mixing kettle 008, start stirring, add an appropriate amount of pure water, and remove the acid solution The concentration is controlled at 18%, and the steam valve is opened to heat the acid dispensing kettle 008, the temperature of the acid solution is controlled to be 60 degrees, and the stirring is stopped after stirring for 30 minutes, and it is set aside.

[0030] 2. Preparation of white carbon black by ato...

Embodiment 2

[0035] The process of the present invention is illustrated by taking the by-product fluosilicic acid with a concentration of 20% in a phosphate fertilizer company in Hubei as an example.

[0036] 1. Adjust the concentration of fluosilicic acid:

[0037] Turn on the ventilation switch and acid mist absorption system of the acid mixing kettle 008, send the fluosilicic acid solution with a room temperature of 10 degrees and 20% concentration into the acid mixing kettle 008, open the steam valve to heat the acid mixing kettle 008, and control the temperature of the acid solution It is 35 degrees, stop stirring after stirring for 30 minutes, and set aside.

[0038] 2. Preparation of white carbon black by atomization reaction:

[0039] White carbon black and water are used to form a slurry with a mass percentage of solid-liquid slurry of 20% to adjust the process parameters before production. Open the passage of air filter 012, spray drying tower 001, dust removal device and exhau...

Embodiment 3

[0043] The process of the present invention is illustrated by taking the by-product fluosilicic acid with a concentration of 18% produced by a Hubei Phosphorus Chemical Co., Ltd. as an example.

[0044] 1. Adjust the concentration of fluosilicic acid:

[0045] Turn on the ventilation switch and acid mist absorption system of the acid mixing kettle 008, send the fluosilicic acid solution with a room temperature of -3 degrees and 18% concentration into the acid mixing kettle 008, start stirring, and open the steam valve to heat the acid mixing kettle 008. Control the temperature of the acid solution to 40°C, stop stirring after stirring for 30 minutes, and set aside.

[0046] 2. Preparation of white carbon black by atomization reaction:

[0047] White carbon black and water are used to form a slurry with a mass percentage of solid-liquid slurry of 18% to adjust the process parameters before production. Open the passage of air filter 012, spray drying tower 001, dust removal de...

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Abstract

The invention relates to a method for preparing gas-phase SiO2 and recovering HF by one-step pyrolysis of fluosilicic acid. The method comprises the following steps: by using a spray drying tower as areactor, feeding high-temperature hot air into the spray drying tower from a hot air distributor of the spray drying tower, and spraying a fluosilicic acid aqueous solution into the spray drying tower through an atomizing nozzle of the spray drying tower; controlling the temperature in the spray drying tower to be 450-110 DEG C from top to bottom, collecting a solid product to obtain fumed silica, absorbing a gas product with water to obtain hydrofluoric acid, absorbing residual gas with alkali liquor, and discharging the residual gas into the atmosphere. Gas-phase SiO2 can be obtained through a one-step method, HF is recycled, the preparation method is simple and environmentally friendly, and industrialization can be well achieved. The obtained gas-phase SiO2 particles are nucleating substances instantly generated under the gas-phase condition, so that the gas-phase SiO2 particles have the characteristics of fine particle size(nanoscale 30-60nm), high purity, large specific surface area, large surface energy, easiness in agglomeration and the like, and far exceed the requirements of GB / T20020-2013 Gas-phase Silicon Dioxide Quality Standard.

Description

technical field [0001] The invention relates to the preparation of gas-phase SiO by one-step pyrolysis of fluorosilicic acid 2 And the method for recovering HF belongs to the technical field of chemical environmental protection. Background technique [0002] A large amount of fluorine-containing gas will be produced in the process of preparing phosphoric acid, phosphate fertilizer, steelmaking, aluminum smelting, glass fiber production, ie fluorine chemical production, etc. The main components of the gas are HF, SiF 4 , sulfur oxides, nitrogen oxides, ammonia and other substances. According to the introduction of relevant literature: every ton of yellow phosphorus produced will discharge 30kg of fluorine; one ton of phosphate fertilizer will discharge 5-25kg of fluorine; one ton of metal aluminum will discharge 16-24kg of fluorine. In the fluorite added in steelmaking, almost all the fluorine in it is discharged. There are also some metal ores containing fluorine, which a...

Claims

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Application Information

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IPC IPC(8): C01B33/18C01B7/19
CPCC01B33/184C01B7/193C01P2006/80
Inventor 田辉明田正芳喻瑜丽黄林勇江军民雷绍民
Owner HUANGGANG NORMAL UNIV
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