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A kind of preparation SIO from low-grade kaolin 2 / al 2 o 3 Composite Methods

A composite material, kaolin technology, applied in chemical instruments and methods, water/sludge/sewage treatment, silicon compounds, etc., to avoid waste of resources, promote the construction of ecological civilization, and achieve good economic benefits.

Inactive Publication Date: 2020-11-17
NEIJIANG NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • A kind of preparation SIO from low-grade kaolin <sub>2</sub> / al <sub>2</sub> o <sub>3</sub> Composite Methods
  • A kind of preparation SIO from low-grade kaolin <sub>2</sub> / al <sub>2</sub> o <sub>3</sub> Composite Methods
  • A kind of preparation SIO from low-grade kaolin <sub>2</sub> / al <sub>2</sub> o <sub>3</sub> Composite Methods

Examples

Experimental program
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Embodiment 1

[0031] Weigh 100g of kaolin and add it into a stirred tank filled with 300ml of 5% dilute hydrochloric acid solution by mass fraction, stir for 30min, pour the mixed solution in the stirred tank into the filter residue obtained by filtering in a separator and about 400ml of washing water. Pass the above-mentioned washing water into the sedimentation tank, add 4g of adsorbent and keep stirring for 60 minutes, then stop stirring, and discharge the solution after reaching the standard. The filter residue is then reacted with 200ml mass fraction of 30% nitric acid solution in a reaction kettle at 150° C. After reacting for 2 hours, filter to obtain aluminum salt solution and solid SiO 2 , mix the solid with 200ml of hydrofluoric acid and collect the silicon fluoride gas with a gas collection bag; mix and stir the aluminum salt solution with 40g of sodium hydroxide in the reactor for 20 minutes, and then pass the silicon fluoride gas collected above into the reactor middle. After ...

Embodiment 2

[0033] Weigh 100g of kaolin and add it into a stirred tank filled with 200ml of 10% dilute hydrochloric acid solution by mass fraction, stir for 30min, pour the mixed solution in the stirred tank into the filter residue obtained by filtering in a separator and about 400ml of washing water. Pass the above-mentioned washing water into the sedimentation tank, add 4g of adsorbent and keep stirring for 60 minutes, then stop stirring, and discharge the solution after reaching the standard. The filter residue is then reacted with 150ml mass fraction of 40% nitric acid solution in a reaction kettle at 150° C. After reacting for 2 hours, filter to obtain aluminum salt solution and solid SiO 2 , mix the solid with 200ml of hydrofluoric acid and collect the silicon fluoride gas with a gas collection bag; mix and stir the aluminum salt solution with 40g of sodium hydroxide in the reactor for 20 minutes, and then pass the silicon fluoride gas collected above into the reactor middle. After...

Embodiment 3

[0035] Weigh 100g of kaolin and add it into a stirred tank filled with 200ml of dilute hydrochloric acid solution with a mass fraction of 20%, stir for 30min, pour the mixed solution in the stirred tank into the filter residue obtained by filtering in a separator and about 400ml of washing water. Pass the above-mentioned washing water into the sedimentation tank, add 4g of adsorbent and keep stirring for 60 minutes, then stop stirring, and discharge the solution after reaching the standard. The filter residue is then reacted with 150ml mass fraction of 40% nitric acid solution in a reaction kettle at 150° C. After reacting for 2 hours, filter to obtain aluminum salt solution and solid SiO 2 , mix the solid with 200ml of hydrofluoric acid and collect the silicon fluoride gas with a gas collection bag; mix and stir the aluminum salt solution with 40g of sodium hydroxide in the reactor for 20 minutes, and then pass the silicon fluoride gas collected above into the reactor middle....

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Abstract

The invention discloses a method for preparing a SiO2 / Al2O3 composite material from low-grade kaolin. The method comprises the following steps: mixing the low-grade kaolin and hydrochloric acid in a stirring kettle under stirring to obtain kaolin slurry, performing filtration, and performing washing to obtain washing water and a mixture; performing a reaction on the mixture and a nitric acid solution, performing filtration to obtain an aluminum nitrate solution and a silicon dioxide solid, mixing hydrofluoric acid and the silicon dioxide solid, and collecting a silicon fluoride gas generated by the reaction by using a gas collecting bag; and mixing the aluminum nitrate solution and a hydroxide solution under stirring in a reaction kettle, introducing a collected silicon fluoride gas into the reaction kettle, performing a reaction, performing filtration, performing washing to obtain a mixed solution of hydrofluoric acid and sodium nitrate and a SiO2 / Al(OH)3 precursor, and performing calcination on the precursor to obtain the SiO2 / Al2O3 composite material. The method disclosed by the invention has sufficient raw materials and low price, a wet purification process can be performed atlower temperature, and the method has the advantages of low energy consumption, low costs, simple equipment and large processing capacity.

Description

technical field [0001] The invention belongs to the field of material chemical industry, in particular to a method for preparing SiO from low-grade kaolin 2 / Al 2 o 3 Composite approach. Background technique [0002] my country is extremely rich in kaolin resources, and the total amount of resources ranks among the top in the world. For a long time, the vast majority of kaolin was only used as a raw material for ceramics or as a bulk non-functional filling material. At the same time, due to the improper use of kaolin, the utilization rate is very low, and the tailings output rate is very high, and kaolin tailings are mostly treated by using terrain to build tailings ponds, stacking on the spot or backfilling for reclamation, which seriously pollutes the environment and damages the ecology. balance, while causing a large loss of resources. [0003] Due to the different types of ingredients contained in kaolin and the different proportions of each substance, there are hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F101/30C02F101/36
CPCB01J20/08B01J20/103C02F1/281C02F2101/308C02F2101/36
Inventor 郑小刚王珂李达伟胡玉婷任莉英董阳
Owner NEIJIANG NORMAL UNIV
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