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Composition for preparing spherical ceramic particles, and spherical ceramic particles as well as preparation method and application thereof

A technology of ceramic particles and compositions, applied in the field of special ceramics, can solve the problems of reducing the molding efficiency of spherical green bodies, energy loss, etc., and achieve the effects of facilitating large-scale industrial production, low production energy consumption, and low cost

Inactive Publication Date: 2017-04-19
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the above-mentioned prior art, the raw materials are all processed by ball milling, resulting in energy loss. At the same time, when the ground fine powder is directly used as raw material for granulation, it takes a lot of time to make the original powder grow into a nucleation center, thereby Greatly reduces the molding efficiency of spherical green bodies

Method used

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  • Composition for preparing spherical ceramic particles, and spherical ceramic particles as well as preparation method and application thereof
  • Composition for preparing spherical ceramic particles, and spherical ceramic particles as well as preparation method and application thereof
  • Composition for preparing spherical ceramic particles, and spherical ceramic particles as well as preparation method and application thereof

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Embodiment approach

[0046] According to the composition of the present invention, the type of the binding agent can be selected in a wide range, and the binding agents conventionally used in the art can be used in the present invention. According to a preferred embodiment of the present invention, the binding agent One or more of polyvinyl alcohol, dextrin and starch.

[0047] According to the composition of the present invention, the type of the solvent can be selected in a wide range, and solvents commonly used in the field can be used in the present invention. According to a preferred embodiment of the present invention, the solvent is water.

[0048] The use of the aforementioned composition of the present invention to prepare spherical ceramic particles can reduce the energy consumption of processing raw materials, shorten the molding time of spherical particles, and thereby reduce the production cost of spherical ceramic particles. The raw material formula of the invention is simple, enviro...

Embodiment 1

[0092] Add 6 kilograms of coarse-grained fly ash (the first fly ash) of d50=45 micron, d10=31 micron, d90=65 micron into a disc-type ball forming machine with a diameter of 1.5 meters, and rotate at a speed of 15 rpm to form For ball disks, spray 1.3kg of PVA solution with a concentration of 0.5wt% evenly in 15 minutes, so that the surface of the coarse-grained fly ash is fully wetted, and there is no bonding between the particles, and there is a good particle size in the ball disk. fluidity;

[0093] Add d50=1.6 micron, d10=0.2 micron, d90=6.3 micron fine particle size fly ash (second fly ash) and PVA solution into the coarse particle size fly ash after wetting evenly, and continuously Repeat the steps of adding fine powder and adding binder solution to make spherical particles grow up constantly, and grow to 0.18 millimeters through 50 minutes. At this stage, the add-on of PVA solution is 53.7 kilograms, and the add-on of the second particle size fly ash is 270kg;

[0094]...

Embodiment 2

[0096] Add 2 kg of fly ash with a coarse particle size of d50=58 microns, d10=53 microns, and d90=73 microns into a disc-type ball forming machine with a diameter of 1.5 meters, turn it into a ball disc at a speed of 20 rpm, and spray it with mist in 10 minutes. Spray evenly 0.43kg of PVA binder solution with a concentration of 10wt% into the chemical nozzle, so that the surface of the coarse-grained fly ash is fully wetted, and there is no bonding between the particles, and it has good fluidity in the ball-forming disk;

[0097] Add d50=3 micron, d10=1.1 micron, d90=9.5 micron fine particle size fly ash and binder solution evenly into the wetted coarse particle size fly ash, and repeat adding fine powder and adding The step of binding agent solution makes spherical particle grow up constantly, and grows to 0.25 millimeter through 76 minutes, and the add-on of binding agent solution is 39.57 kilograms at this stage, and the add-on of the second particle size fly ash is 190 kilo...

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Abstract

The invention relates to the field of ceramic materials, in particular to a composition for preparing spherical ceramic particles, and the spherical ceramic particles as well as a preparation method and application thereof. The composition comprises a nucleating primer, growing fine powder, a binding agent and a selectable solvent, wherein the nucleating primer comprises first coal ash; the growing fine powder comprises second coal ash, and the grain size of the first coal ash is greater than that of the second coal ash. The composition provided by the invention is simple in formula of raw materials, green and environmental-friendly, low in cost and convenient for industrial production on a large scale. Meanwhile, the treatment energy consumption of the raw materials can be reduced and the forming time of the spherical particles can be shortened, so that the production cost of the spherical ceramic particles is lowered. The typical properties of the spherical particles prepared by the method provided by the invention are as follows: the diameter is greater than 0.1mm, the bulk density is 1.30-1.80g / cm<3>, and the true density is 2.3-3.0g / cm<3>. The spherical ceramic particles can be used in the field of a petroleum fracturing supporting agent, a grinding medium, casting sand, chemical packing spheres, building materials and light ceramsite for water treatment and the like.

Description

technical field [0001] The invention belongs to the technical field of special ceramics, and relates to a composition for preparing spherical ceramic particles, a method for preparing spherical ceramic particles, spherical ceramic particles obtained by the method of the invention and applications thereof. Background technique [0002] Ceramic particles usually refer to inorganic non-metallic minerals or chemical powders as raw materials, through a specific molding process to obtain green particles of a certain shape, and then sintered at a high temperature to prepare a sintered body with stable structure. Among them, the use of spherical ceramic particles is particularly extensive. For example, using bauxite as a raw material, spherical ceramic particles of 8-70 meshes-fracturing proppant materials can be prepared for the exploitation of oil, natural gas and shale gas; 0.1-30mm spherical alumina (mullite, zirconia, silicon carbide, etc.) can be used as grinding media for fin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/135
CPCC04B33/1328C04B33/1352C04B35/62695C04B2235/5436C04B2235/77Y02P40/60
Inventor 丁书强高光辉卓锦德赖世燿
Owner CHNA ENERGY INVESTMENT CORP LTD
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