Method and application for carrying out fly ash floating bead surface modification by using compound coupling agent

A technology of fly ash floating beads and surface modification, which is applied in chemical instruments and methods, fibrous fillers, coatings, etc., to achieve the effects of good effect, improved dispersibility, and easy implementation.

Inactive Publication Date: 2013-01-02
ANHUI UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0019] The present invention adopts silane / titanate compound coupling agent as surfactant to carry out surface modification on fly ash floating beads, but the difference from traditional chemical surface modification is that fly ash is pretreated first, which is more effective Remove the impurity components in the fly ash efficiently; secondly, choose compound coupling agent for surface modification to overcome the defect of poor modification effect of traditional single coupling agent treatment, simple operation and good effect

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  • Method and application for carrying out fly ash floating bead surface modification by using compound coupling agent
  • Method and application for carrying out fly ash floating bead surface modification by using compound coupling agent
  • Method and application for carrying out fly ash floating bead surface modification by using compound coupling agent

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Embodiment Construction

[0039] Surface treatment of fly ash floating beads produced by Huainan Pingwei Power Plant, wherein the particle size of fly ash floating beads is ≤140 mesh, and the main components include SiO 2 、Al2 o 3 , Fe 2 o 3 , CaO, etc., porosity 60-75%, specific surface area 0.3-0.45m 2 g -1 , loose dry density 600~1000kg / m 3 , compaction density 1300~1600 kg / m 3 , the specific operation is as follows:

[0040] 1. Pretreatment of fly ash

[0041] Since the raw powder of fly ash contains impurities such as unburned carbon, it must be pretreated before use. The treatment methods adopted in the present invention are sintering and acid-base treatment. The present invention has carried out twice processing to fly ash successively, and its processing step is as follows:

[0042] a. Take a certain amount of fly ash floating beads and sinter at 350-450°C for 48 hours to remove unburned carbon and other impurities;

[0043] b. Place the sintered fly ash in dilute acid and dilute alka...

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Abstract

The invention relates to a fly ash floating bead surface modification technology, and specifically relates to a method for carrying out fly ash floating bead surface modification by using a compound silicane coupling agent. First, fly ash is subjected to sintering and acid-alkali pretreatments; and the pretreated fly ash is subjected to a surface modification treatment by using the compound coupling agent. When fly ash is processed through surface modification with the method provided by the invention, physical and chemical properties of obtained surface-modified fly ash floating beads are changed, dispersity of the beads in resin and organic polymers is improved, and compatibility of a filling material with interfaces of substrates such as resin is improved. Further, mechanical properties and other performances of high-molecular materials such as plastic, paint, and rubber are improved. Therefore, an improvement method is provided for better utilization of fly ash, and environment pollution is reduced.

Description

technical field [0001] The invention relates to the field of surface modification of fly ash floating beads, in particular to a method for surface modification of fly ash floating beads and an application thereof. Background technique [0002] The generation of floating beads in fly ash is mainly due to various physical and chemical reactions such as dehydration, oxidation, combustion and compatibility change under the action of high temperature when the pulverized coal is burned in the boiler. Form hollow glass microspheres. Rich in a large number of inorganic compounds, among which Al 2 o 3 and SiO 2 Mainly. [0003] The surface modification of fly ash mainly depends on the adsorption, coating and destruction of chemical modifiers on the surface of fly ash. Surface chemical modifiers can destroy the hard shell on the surface of fly ash particles, make the soluble substances on the surface of the glass body react with alkaline oxides to form gelled substances, and melt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C1/40C09C1/24C09C1/02C09C3/12C09C3/08C09C3/06C08K9/12C08K9/06C08K9/04C08K3/22C08L101/00C09D7/12C09D5/18
Inventor 王庆平秦汝祥闵凡飞腾丽影王辉
Owner ANHUI UNIV OF SCI & TECH
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