Surface treatment technique of fly ash hollow microspheres
A technology of hollow microspheres and surface treatment, applied in the field of surface treatment, can solve the problems of no selectivity, differences in physical properties such as microbead density, irregular shape of microbeads, etc., and achieve the effect of improving coating ability
Active Publication Date: 2017-06-09
有研资源环境技术研究院(北京)有限公司
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Problems solved by technology
[0004] Because fly ash will have other impurities in the combustion process, it is easy to stick to the surface of the microbeads at high temperature, making the shape of the microbeads irregular. At the same time, the density of the microbeads is not strictly controlled during the growth process. There is a big difference in physical properties such as
[0005] Since microbeads are by-products of power plants and are cheap, most of them are currently used as refractory materials or filling materials. Acid treatment or alkali treatment, these methods can not treat the small particles adhered to the surface very well, and they do not have good selectivity at the same time
Method used
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Embodiment 1
[0030] Taking the surface treatment of a batch of fly ash hollow microspheres as an example, the specific operation steps are as follows:
[0031] (1) Alcohol washing
[0032] Carry out alcohol wash to microbead, temperature is 25 ℃, alcohol wash time is 30min, agitation intensity is 500rpm, stand for 5min after layering, filter and recover the microbead precipitated in the lower part of alcohol wash solution;
[0033] (2) washing
[0034] Wash the microbeads after alcohol washing, the temperature is 25°C, the washing time is 15min, the stirring intensity is 500rpm, the layers are separated after standing for 5min, and the microbeads floating on the upper part of the washing solution are filtered and recovered;
[0035] (3) Ultrasonic treatment
[0036] Ultrasonic treatment was carried out on the microbeads after water washing, the temperature was 25°C, the ultrasonic time was 10min, and the ultrasonic intensity was 40KHZ, and the microbeads floating on the upper part were r...
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Abstract
The invention discloses a surface treatment technique of fly ash hollow microspheres. The surface treatment technique comprises the following steps: (1) carrying out alcohol washing on microspheres, standing to stratify, and recovering the microspheres precipitated on the lower part of the alcohol washing solution; (2) carrying out water washing on the microspheres subjected to alcohol washing, standing to stratify, and recovering the microspheres floating on the upper part of the water washing solution; (3) carrying out ultrasonic treatment on the microspheres subjected to water washing; (4) carrying out acid treatment on the microspheres subjected to ultrasonic treatment, and repeating the step (2); and (5) carrying out alkali treatment on the microspheres, and repeating the step (2) to obtain the light-weight microspheres applicable to application. According to the formation characteristics of the fly ash hollow microspheres, the alcohol washing, water washing, ultrasonic washing, acid treatment, alkali treatment and other means are utilized to treat the microsphere surfaces so as to select the high-quality light-weight microspheres applicable to application of which the density is 0.7-1 g / cm<3>, thereby enhancing the application capacity of the subsequent material.
Description
technical field [0001] The invention relates to a surface treatment process of fly ash hollow microspheres ("microspheres" for short), belonging to the technical field of surface treatment. Background technique [0002] Fly ash hollow microspheres are microspheres separated from fly ash. Fly ash is composed of various particles with large differences in shape. All kinds of particles are formed by the melting and cooling of the ash when coal powder is burned in the boiler. The main chemical components of fly ash hollow floating beads are silicon oxide and aluminum oxide, which are about 60% and 30% respectively. [0003] Fly Ash Cenospheres. Coal-measure clay minerals are mainly kaolinite and illite hydromica, which are dehydrated and exhausted at about 550°C, changing from monoclinic phase to amorphous phase, due to expansion and exhaust, the texture becomes loose and porous, from 1000 Gradually melt and decompose at -1300°C to form a symbiotic combination of mullite and ...
Claims
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IPC IPC(8): C03C23/00C03C15/00
Inventor 王巍黄松涛杨丽梅徐政纪仲光李岩
Owner 有研资源环境技术研究院(北京)有限公司