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Modified fly ash with surface coated with SiO2 and preparation method and use thereof

A technology of surface coating and fly ash, which is applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., to achieve the effects of process simplification, cost reduction and high added value

Active Publication Date: 2015-03-11
SHAANXI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fly ash is generally gray, has a strong coloring effect, and has strong water absorption. As a filler, there are color matching problems and construction problems in coatings.

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0026] A surface coated SiO provided by the invention 2 The preparation method of the modified fly ash comprises the following steps: step 1) fly ash iron removal,

[0027] Add hydrochloric acid with a concentration of 6mol / L to the fly ash, and control the solid-liquid ratio to 1:6-1:3, filter and wash with water to neutral after fully reacting, then filter and dry the reacted fly ash to Moisture content is 0.1%;

[0028] Step 2) capillary adsorption of paraffin,

[0029] Blending the fly ash and molten paraffin after iron removal in step 1) in a ratio of 5:1-1:1 by weight for 1-2h to obtain the fly ash with capillary adsorption of paraffin;

[0030] Step 3) Surface coated with SiO 2 ,

[0031] According to the weight ratio of capillary adsorption of paraffin fly ash: silica sol = 1:3 ~ 1:2 mixing, the concentration of silica sol used is 25-32%, and the pH value of the system is controlled at 10 ~ 11, stirring until a mixed gel is formed, The gelling temperature of the s...

Embodiment 1

[0037] A surface-coated SiO 2 The preparation method of the modified fly ash comprises the following steps: step 1) fly ash iron removal,

[0038] Add hydrochloric acid with a concentration of 6mol / L to the fly ash, and control the solid-liquid ratio to 1:3, filter and wash with water to neutral after full reaction, then filter and dry the reacted fly ash to a moisture content of 0.1 %;

[0039] Step 2) capillary adsorption of paraffin,

[0040] Blending the fly ash and molten paraffin after iron removal in step 1) in a ratio of 1:1 for 1 hour to obtain the fly ash with capillary adsorption of paraffin;

[0041] Step 3) Surface coated with SiO 2 ,

[0042] Use silica sol with a concentration of 32%, mix the fly ash of paraffin by capillary adsorption: silica sol=1:2, and control the pH value of the system to 10, stir until a mixed gel is formed, and the gelling temperature of the stirring is 40°C , the gelling time is 50-60min; the mixed gel is vibrated and dehydrated, ai...

Embodiment 2

[0044] A surface-coated SiO 2 The preparation method of the modified fly ash comprises the following steps: step 1) fly ash iron removal,

[0045] Add hydrochloric acid with a concentration of 6mol / L to the fly ash, and control the solid-liquid ratio to 1:4. After fully reacting, filter and wash with water until neutral, then filter and dry the reacted fly ash to a moisture content of 0.1 %;

[0046] Step 2) capillary adsorption of paraffin,

[0047] Blending the fly ash and molten paraffin after iron removal in step 1) in a ratio of 2:1 for 1 hour to obtain the fly ash with capillary adsorption of paraffin;

[0048] Step 3) Surface coated with SiO 2 ,

[0049] Use silica sol with a concentration of 25%, mix the fly ash of paraffin by capillary adsorption: silica sol=1:3, and control the pH value of the system to 10, stir until a mixed gel is formed, and the gelling temperature of the stirring is 40°C , the gelling time is 50-60min; the mixed gel is vibrated and dehydrated,...

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Abstract

The invention belongs to the technical field of inorganic powder surface modification, and in particular relates to modified fly ash with surface coated with SiO2 and a preparation method and use thereof, the method is as follows: Step 1) fly ash iron removal, step 2) capillary adsorption paraffin, step 3) coating of the surface with SiO2, the water absorption rate of the modified fly ash prepared by the method is 20%-22%, the whiteness is 20-30, the near infrared reflectivity is 60-80%, the coefficient of thermal conductivity is less than 0.25W / M.K; and the modified fly ash prepared by the method has good barrier thermal insulation and reflective thermal insulation performances. A thermal insulation coating prepared from the modified fly ash has excellent thermal insulating property, can be used in epoxy floor coatings, acrylic coatings for exterior wall, casting coatings and the like, and is free of the color and the construction problems, and high in added value.

Description

technical field [0001] The invention belongs to the technical field of inorganic powder surface modification, in particular to a surface-coated SiO 2 Modified fly ash and its preparation method and use. Background technique [0002] In the 1970s, the global energy crisis, environmental pollution and the depletion of mineral resources strongly stimulated the research and development of fly ash utilization, and the resource utilization of fly ash has always been a matter of great concern to governments, experts and scholars all over the world. . According to relevant data, the total annual discharge of fly ash in my country has exceeded 1 billion tons, and is still increasing at a rate of 120 million tons per year, while the utilization rate is less than 50% of the annual discharge. Compared with Germany's 65% utilization rate of fly ash, France's 75% utilization rate of fly ash, and Japan's 100% utilization rate of fly ash, the utilization rate of fly ash in my country is s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/12C04B18/08
CPCC04B18/08C09D7/62Y02W30/91
Inventor 袁新强
Owner SHAANXI UNIV OF TECH
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