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A preparation method of fly ash surface functionalized composite coating layer

A technology of surface functionalization and fly ash, which is applied in the field of solid waste recycling engineering in the discipline of environmental engineering, can solve the problems of not being able to change the appearance and color of fly ash, the chemical stability of surface morphology, and restricting the application of fly ash , to achieve the effect of improving whiteness and chemical stability, increasing utilization rate and added value, and broadening utilization channels

Active Publication Date: 2011-12-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although organic coupling agents or surfactants can improve the surface properties of fly ash to a certain extent and increase the affinity with the polymer matrix, they cannot change the appearance color, surface morphology and chemical stability of fly ash, thus greatly Limit the application of fly ash in polymer

Method used

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  • A preparation method of fly ash surface functionalized composite coating layer
  • A preparation method of fly ash surface functionalized composite coating layer
  • A preparation method of fly ash surface functionalized composite coating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 500g of fly ash pretreated, 60g of water glass (modulus 3), 0.3g of sodium hexametaphosphate and 1500g of water were stirred at a constant speed in a reaction vessel for 30 minutes, and the pH was adjusted to 9.0, then the suspension was heated to 90°C, reacted for 4 hours, then stopped stirring and heating, cooled to room temperature, filtered, washed, and dried to obtain a silica-coated fly ash sample; 100g of silica-coated Covered fly ash, 100g titanyl sulfate solution with a titanium dioxide concentration of 30%, and 100g water were mixed, stirred at a constant speed for 30 minutes, and the pH was adjusted to 1.4 with a sodium hydroxide solution with a concentration of 1mol / l, and then the suspension Heat to 95°C, react for 4 hours, then stop stirring and heating, cool to room temperature, after filtering, washing, drying and other processes, put it into a dry 850°C muffle furnace, sinter in air atmosphere for 2 hours, cool and take it out The coated sample is obtai...

Embodiment 2

[0025] 500g of fly ash pretreated, 90g of water glass (modulus 3), 0.5g of sodium hexametaphosphate and 2000g of water were stirred at a constant speed in a reaction vessel for 30 minutes, and the pH was adjusted to 9.5, then heat the suspension to 90°C, react for 4 hours, then stop stirring and heating, cool to room temperature, filter, wash, and dry to obtain a silica-coated fly ash sample; 100g silica-coated Covered fly ash, 60g titanium dioxide concentration of 30% titanyl sulfate solution, 100g water are mixed, stirred at a constant speed for 30 minutes, the pH is adjusted to 1.7 with a concentration of 1mol / 1 sodium hydroxide solution, and then the suspension is heated to 95°C, react for 4 hours, then stop stirring and heating, cool to room temperature, filter, wash, dry, etc., put it into a muffle furnace at 800°C, sinter in an air atmosphere for 3 hours, and take it out after cooling. Coat the sample.

Embodiment 3

[0027] 500g of fly ash pretreated, 30g of water glass (modulus 3), 0.5g of sodium hexametaphosphate and 1500g of water were stirred at a constant speed in a reaction vessel for 30 minutes, and the pH was adjusted to 8.5, then heat the suspension to 95°C, react for 4 hours, then stop stirring and heating, cool to room temperature, filter, wash, and dry to obtain a silica-coated fly ash sample; 100g silica-coated Covered fly ash, 30g titanyl sulfate solution with a titanium dioxide concentration of 30%, and 100g water were mixed, stirred at a constant speed for 30 minutes, and the pH was adjusted to 2.0 with a sodium hydroxide solution with a concentration of 1mol / 1, and then the suspension Heat to 95°C, react for 4 hours, then stop stirring and heating, cool to room temperature, after filtering, washing, drying and other processes, put it into a dry 850°C muffle furnace, sinter in air atmosphere for 2 hours, cool and take it out The coated sample is obtained.

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Abstract

The invention relates to a method for preparing a functionalized composite coating film layer on the surface of fly ash, which belongs to the technical field of solid waste recycling engineering in the discipline of environmental engineering. The method includes mixing fly ash, water glass with a modulus of 1-3, sodium hexametaphosphate and water in a weight percentage of (5-20):1:(0.05-0.01):(15-100), Stir, filter and dry to obtain silica-coated fly ash; mix the silica-coated fly ash, titanium salt solution and water, stir, filter and dry to obtain an unsintered titanium dioxide-coated sample; sinter to obtain silica / titanium dioxide Composite coated samples. In the invention, the surface treatment of the fly ash with water glass increases the specific surface area of ​​the fly ash particles, improves the whiteness and chemical stability of the fly ash, and the treated fly ash is a potential excellent polymer filler. The invention can widen the utilization route of fly ash, reduce the serious pollution of solid waste to the environment, and turn harm into benefit.

Description

technical field [0001] The invention relates to a surface modification treatment method of fly ash, which belongs to the technical field of solid waste recycling engineering of the discipline of environmental engineering. Background technique [0002] Fly ash is a fine ash-like residue discharged from the boiler flue gas after coal powder is burned, about 80% is fly ash (Fly Ash), and about 20% is bottom ash (Bottom Ash). Volcanic. my country is a large coal-producing country, and coal is the basic fuel for electricity production. At present, the annual discharge of fly ash in my country is about 180 million tons, but its utilization rate is only about 30%. Every 10,000 tons of fly ash storage covers an area of ​​1334m 2 The above results in a waste of funds and land resources. More importantly, coal-burning fly ash seriously pollutes the atmosphere as suspended particles, and its heavy metal ions pollute soil and water resources through volatilization and infiltration, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/10
Inventor 盖国胜吕兴栋苏莹杨玉芬董怀
Owner TSINGHUA UNIV