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Method for coating nano TiO2 onto surface of serpentine acid pickled de-magging silicon slag

A surface coating, serpentine technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc. convenience, etc.

Inactive Publication Date: 2013-08-21
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nano-TiO 2 The particle size is small, which is inconvenient during storage and use, which affects its performance and recycling

Method used

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  • Method for coating nano TiO2 onto surface of serpentine acid pickled de-magging silicon slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 40g of serpentine acid leaching demagnesia silicon slag powder, 1000mL of distilled water, add concentrated hydrochloric acid to adjust the pH value to 2, and stir evenly. Cool down to below 10°C in an ice-water bath, add 250mL of 0.29mol / L titanium tetrachloride solution and 23.9mL of ammonium sulfate solution with a concentration of 200g / L in sequence; stir the reaction and raise the temperature to 50°C, then add ammonia water to adjust the pH of the reaction solution The value was 6.0, and then aged at 20°C for 8h; the reaction product was filtered and washed with absolute ethanol. After drying at 105°C, calcining at 700°C for 3 hours in a rapid heating resistance furnace to obtain serpentine acid leaching demagnesia silicon slag surface-coated nano-TiO 2 composite powder materials.

Embodiment 2

[0024] Take 100g of serpentine acid leaching demagnesia silicon slag powder, 2500mL of distilled water, add concentrated hydrochloric acid to adjust the pH value to 2.5, and stir evenly. Cool down to below 10°C in an ice-water bath, add 500mL of 0.20mol / L titanium tetrachloride solution and 66mL of ammonium sulfate solution with a concentration of 200g / L in sequence; stir the reaction and raise the temperature to 45°C, then add ammonia water to adjust the pH value of the reaction solution 5.0, and then aged at 30°C for 5h; the reaction product was filtered and washed with absolute ethanol. After drying at 105°C, calcining at 800°C for 2 hours in a rapid heating resistance furnace to obtain serpentine acid leaching demagnesia silicon slag surface-coated nano-TiO 2 composite powder materials.

Embodiment 3

[0026] Take 60g of serpentine acid leaching demagnesium silicon slag powder, 1500mL of distilled water, add concentrated hydrochloric acid to adjust the pH value to 2, and stir evenly. Cool down to below 10°C in an ice-water bath, add 300mL of 0.43mol / L titanium tetrachloride solution and 127.7mL of ammonium sulfate solution with a concentration of 200g / L in sequence; stir the reaction and raise the temperature to 45°C, then add ammonia water to adjust the pH of the reaction solution The value was 7.0, and then aged at 40° C. for 3 h; the reaction product was filtered and washed with absolute ethanol. After drying at 105°C, calcining at 800°C for 2 hours in a rapid heating resistance furnace to obtain serpentine acid leaching demagnesia silicon slag surface-coated nano-TiO 2 composite powder materials.

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Abstract

The invention relates to a method for coating nano TiO2 onto surface of serpentine acid pickled de-magging silicon slag, belonging to the field of mineral processing and mineral material. Serpentine is added with water into pulp, acid is added to regulate pH value and then temperature of slurry is controlled, and TiCl4 solution and ammonium sulphate solution are sequentially added; reactant is heated up to a certain temperature and then ammonia solution is added to regulate pH value of the reactant, and reacting at constant temperature for a certain time; and finally filtering, washing, drying and calcining the reactant, so as to obtain serpentine acid pickled de-magging silicon slag composite powder material with the surface coated with nano TiO2. the serpentine acid pickled de-magging silicon slag composite powder material with the surface coated with nano TiO2 has good photochemical catalytic property, can be applied to water body, atmosphere, indoor air pollution treatment and hasgood practicability.

Description

1. Technical field [0001] The invention relates to a serpentine acid leaching magnesium silicon slag surface-coated nano-TiO 2 The method belongs to the field of mineral processing and mineral materials. 2. Background technology [0002] Since the 1970s, nano-TiO 2 It has been proved to be an environmentally friendly photocatalytic material with high efficiency, non-toxicity, stable performance, and no secondary pollution. It has excellent performance in water, atmosphere, and indoor air pollution control. [0003] Nano-TiO 2 The particle size is small, which is inconvenient during storage and use, which affects its performance and recycling. TiO 2 Coating or loading on a suitable carrier can not only improve the photocatalytic performance but also facilitate the recovery and recycling of the catalyst. Currently researched nano-TiO coating or loading 2 The matrix materials mainly include activated carbon, molecular sieve, zeolite, diatomaceous earth, protein clay, bent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/08B01J21/06
Inventor 郑水林郑黎明戴瑞
Owner CHINA UNIV OF MINING & TECH (BEIJING)