Ceramsite and production method thereof

Abstract

The invention discloses ceramsite and a production method thereof. The ceramsite comprises the following raw materials by weight percentage: 40 to 99.5 percent of high alumina fly ash or high alumina coal slag and 0.5 to 60 percent of bond, and 1 to 23 percent of auxiliary material is particularly added. The above raw materials are ground, dried and burned to form the finished product, so the strength, the fire resistance and the duration of the product are multiplied, and the ceramsite can be used for the production of particular concrete aggregate with the high strength of more than 60MPa and the heat-preserving and heat insulation materials with high fire resistant requirement. At the same time, the ceramsite can be used for proppant for oil and gas well cracks. Compared with the conventional proppant, not only the density is low, the strength is high and the performance is excellent, but also the expensive and rare alumina fire-resistant clay resource can be saved, and the comprehensive application of the resource can be realized. Compared with the prior process, the production method is more energy-saving and more environment-friendly, and favors the industrialized mass production.

Description

technical field [0001] The invention relates to ceramsite aggregate for high-grade concrete and ceramsite for refractory and heat-insulating materials, and also relates to ceramsite (also called ceramsite fracturing crack proppant) used in oil and natural gas exploitation underground operations. Background technique [0002] The ceramsite used in the fracturing fracture proppant of oil and gas wells is filled into the rock fractures of low-permeability deposits under the high closure pressure in the downhole operation of oil and gas exploitation, so as to support the fractures from closing due to stress release. It is a material that allows oil and gas to flow out from fracture channels, thereby ensuring high conductivity of oil and gas and increasing the production of oil and gas wells. [0003] my country's patent CN1085288 discloses a kind of α-AL bauxite which uses roasted bauxite as raw material, multi-stage crushing, batching, dry fine grinding, water mixing, doping, g...

AI Technical Summary

Problems solved by technology

[0006] The above three kinds of ceramsite proppants all use bauxite (clinker) as the main raw material. Lead to the secondary mullite of the product, and the product quality is difficult to stabilize

Moreover, the above three methods all adopt the dry fine grinding process. This method has high energy consumption, large investment, large particle size and unreasonable distribution after grinding, and it is difficult to meet the requirements of high-quality products; and fugitive emissions are difficult to control and cause serious environmental pollution.

[0007] There are many patents on ceramsite aggregates for high-grade concrete made of fly ash (slag) and ceramsite for refractory and heat-insulating materials in China, but the refractory, light-weight and heat-insulating properties and strength of the ceramsite produced cannot meet the requirements

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