A method for preparing low-density ceramsite proppant using high-alumina fly ash as raw material

Abstract

The invention discloses a method for preparing a low-density ceramsite proppant from high-alumina fly ash. The method comprises the steps: (1) proportioning raw high-alumina fly ash, burnt high-alumina fly ash, clay, dolomite, talcum, river sand and an additive, and then, carrying out uniform mixing; adding water into the mixture, and carrying out wet grinding, so as to prepare mud; and then, drying the mud to prepare a powder material, and then, carrying out crushing, so as to prepare micropowder; (2) additionally, carrying out dry-process ball-milling or airflow crushing on raw high-alumina fly ash, so as to obtain micropowder with grain size smaller than 200 meshes; and (3) uniformly mixing the micropowder obtained in the step (1) and the micropowder obtained in the step (2), discontinuously spraying an aqueous solution containing the additive into the mixture, and carrying out granulating, so as to prepare sphere blanks; and then, carrying out polishing, semifinished product screening, baking, calcining and finished product screening, thereby obtaining a finished product. According to the method, the usage amount of the fly ash can reach 90%, the fly ash replaces other aluminiferous silicon raw materials such as bauxite, and the waste is utilized, so that the resource consumption is lowered; and the obtained fly ash proppant product is excellent in performance and stable in quality.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of industrial solid waste resources, in particular to a method for preparing a low-density ceramsite proppant by using high-alumina fly ash as a raw material. Background technique [0002] Fracturing proppants are props that keep rock fractures deep in the formation open. With the large-scale exploitation of unconventional oil and gas resources such as shale oil and shale gas, high-quality fracturing proppant has become the key and core material for hydraulic fracturing to achieve good results, and the usage of high-performance proppant is rapid Increase. [0003] Oil fracturing proppant has gone through the development process of metal aluminum ball → plastic ball → glass ball → quartz sand → ceramsite proppant. At present, in the production process of ceramsite proppant, high-alumina bauxite is generally used as the main raw material, supplemented by one or more materials as ...

AI Technical Summary

Problems solved by technology

Because these substances have very low density, they often float above when mixed with other materials, it is difficult to be ground and mixed evenly, and it is easy to cause segregation of materials

At the same time, most of the particle state of fly ash is loose fine powder aggregates. Its loose and porous structure makes it have a large internal surface area, which will make the material absorb a large amount of water during the grinding process and make the slurry fluidity. and poor stability, affecting slurry drying and billet drying

In addition, the unburned residual carbon is oxidized and volatilized during the firing process, and a large number of hole defects are generated inside the ceramsite particles, which increases the breakage rate of the ceramsite; Glass phase, which causes particles to stick to each other, and production problems such as rotary kiln ring formation and kiln sticking occur

Therefore, the use of fly ash to prepare ceramsite proppants generally has disadvantages such as low utilization rate of fly ash, high production cost, low density of sintered body, and low product strength.

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