Modified montmorillonite-based cement clinker preparation method

A technology of cement clinker and montmorillonite, applied in cement production and other directions, can solve the problems of low strength, unable to meet the requirements of the material market, poor hydrophobicity, etc., to improve the strength and hydrophobicity, improve the interface binding ability, and enhance the binding force Effect

Inactive Publication Date: 2019-06-21
FOSHAN GAOMING DISTRICT ZHUAHE NEW MATERIAL TECH CO LTD
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for preparing modified montmorillonite-based cement clinker in view of the defects that the current common cement clinker has low strength and poor hydrophobicity and cannot meet the requirements of the material market

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  • Modified montmorillonite-based cement clinker preparation method

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[0022] In parts by weight, weigh 68 to 72 parts of limestone, 8 to 10 parts of sandstone, 4 to 6 parts of fly ash and 3 to 5 parts of steel slag to mix and grind for 18 to 21 minutes to obtain cement raw meal; Put 80g of montmorillonite into a muffle furnace, and calcined at a temperature of 950-980°C for 24-32 minutes to obtain a calcined product. After cooling, mix and stir the calcined product and deionized water at a mass ratio of 1:3 for 6 ~9min to obtain a suspension; according to the volume ratio of 6:1, mix the suspension and 24% sodium bicarbonate solution with mass fraction and stir for 45~60min to obtain a reaction solution, and adjust the reaction with hydrochloric acid with a concentration of 0.5mol / L The pH of the solution is 5.2-5.6. After adjustment, pour it into a centrifuge and centrifuge for 8-11 minutes. Separate and remove the upper layer to obtain the lower layer of sediment. Finally, put the lower layer of sediment in an oven at a temperature of 85-90°C. ...

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Abstract

The invention discloses a modified montmorillonite-based cement clinker preparation method, and belongs to the technical field of cement clinker preparation. According to the method, limestone, clay,sandstone, fly ash and steel slag are mixed, grinded and crushed to obtain a cement raw material; montmorillonite is subjected to an activation reaction, an acidification reaction and a sodium modification reaction to obtain modified montmorillonite; aluminate cement is grinded and crushed to obtain aluminate cement powder; and the aluminate cement powder is subjected to surface modification witha polyvinyl alcohol solution, wherein the group in the polyvinyl alcohol solution and the surface of the aluminate cement powder are subjected to a hydroxyl reaction, the partial covalent bond is formed through drying dewatering, the tricalcium aluminate and the tetracalcium aluminoferrite in the aluminate cement powder chemically react with the phosphogypsum in a filler to form hydrated calcium sulphoaluminate and hydrated calcium sulphoferrate, and the hydrated products are attached to the surface of the substrate, seal the surface of the hydrated component, block the diffusion of water molecules and ions, and improve the strength and the hydrophobicity of the cement clinker so as to achieve broad application prospects.

Description

technical field [0001] The invention discloses a method for preparing modified montmorillonite-based cement clinker, which belongs to the technical field of cement clinker preparation. Background technique [0002] Cement clinker is a semi-finished product obtained by using limestone, clay, and iron as the main raw materials, which are prepared into raw meal in an appropriate proportion, burned until part or all of it is melted, and cooled. In the cement industry, the most commonly used Portland cement clinker is mainly composed of calcium oxide, silicon dioxide and a small amount of aluminum oxide and iron oxide. The main mineral composition is tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite. Portland cement clinker and appropriate amount of gypsum are ground together to form Portland cement. [0003] When studying cement hydration, in order to minimize unknowable factors, laboratory-synthesized cement and clinker single miner...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/26C04B7/38C04B7/44
CPCY02P40/10
Inventor 胡次兵杨明忠陈可
Owner FOSHAN GAOMING DISTRICT ZHUAHE NEW MATERIAL TECH CO LTD
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