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Clinker-free cement and method for preparing same

A white cement, clinker-free technology, applied in the field of white cement, can solve the problems of high energy consumption and low whiteness of products

Inactive Publication Date: 2008-06-18
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, white cement is widely used in the construction industry. Ordinary white cement uses clay and limestone with low iron content as the main raw materials. The calcination temperature of white cement is generally between 1300 ° C and 1400 ° C, which consumes a lot of energy and has low whiteness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Embodiment 1, a kind of clinker-free white cement and preparation method thereof. (1) Preparation of calcined kaolin: grind kaolin with low iron-titanium content, high kaolinite content, and whiteness requirements (whiteness ≥ 90% after calcination) into powder, and calcined at an appropriate temperature to form amorphous Al 2 o 3 and SiO 2 (2) Calcined gypsum: dihydrate gypsum, anhydrite, and various chemical gypsums can be used, whiteness requirement (whiteness after calcination ≥ 90%), standby after calcination; (3) Lime: whiteness requirement ≥ 90% (4) Water reducer: xanthic acid formaldehyde condensate or other cement water reducer; (5) Preparation principle of clinker-free kaolin white cement: calcined kaolin and lime powder (CaO), gypsum powder (CaSO 4 .2H 2 O) mixed in a certain proportion, this mixture mainly reacts as follows after meeting water:

[0007] Al 2 o 3 +nCaO+mH 2 O→nCaO.Al 2 o 3 .mH 2 O (calcium aluminate hydrate)

[0008] xCaO+SiO 2 +y...

Embodiment 2

[0010] Embodiment 2, a kind of clinker-free white cement and preparation method thereof, weigh 100kg of calcined kaolin prepared according to (1) in Example 1, weigh 67kg of calcined gypsum prepared according to (2) in Example 1, weigh According to the lime 67kg required in (3) in Example 1, weigh 1.4kg according to the water reducer xanthic acid formaldehyde condensate required in (4) in Example 1, mix it evenly to make clinker-free kaolin white cement .

Embodiment 3

[0011] Embodiment 3, a kind of clinker-free white cement and preparation method thereof, weigh 100kg of calcined kaolin prepared according to (1) in Example 1, weigh 30kg of calcined gypsum prepared according to (2) in Example 1, weigh According to the lime 30kg required in (3) in Example 1, weigh 0.8kg according to the water reducer xanthic acid formaldehyde condensate required in (4) in Example 1, mix it evenly to make clinker-free kaolin white cement .

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Abstract

The invention relates to a preparation method of clinker-free white cement, belonging to a technical field of novel architectural decorative material preparation, which is a white cement processed by nonmetallic mineral powder. The invention is formed by mixing calcined kaolin, calcined plaster, calcies, and water reducer, wherein the weight proportion of the mixing calcined kaolin, calcined plaster, calcies, and water reducer is the following in order: 100:25-67:25-67:0.4-1.4; the water reducer adopts retinoic acid and formaldehyde polymer or others. By the invention, the produced white cement has high strength and high whiteness, the whiteness of general white cement is 70-80 percent, the whiteness of the clinker-free white cement of the invention can reach 90-93 percent; calcining temperature only needs about 800 DEG C, thereby saving energy; the product can be stored for long time.

Description

1. Technical field [0001] The invention discloses a clinker-free white cement and a preparation method thereof, belonging to the technical field of new building decoration materials and preparation thereof, and is white cement processed and prepared by using non-metallic mineral powder. 2. Background technology [0002] At present, white cement is widely used in the construction industry. Ordinary white cement uses clay and limestone with low iron content as the main raw materials. The calcination temperature of white cement is generally 1300°C to 1400°C, which consumes a lot of energy and has low whiteness. 3. Contents of the invention [0003] The purpose of the present invention is to provide a kind of white cement which uses non-metallic mineral powder as the main raw material, utilizes the chemical reaction of inorganic substances to generate strength, has low energy consumption, and greatly improves product strength and whiteness. [0004] A clinker-free white cemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/06C04B7/42
CPCC04B2111/802C04B7/00
Inventor 李凯琦曾玉凤申义青
Owner HENAN POLYTECHNIC UNIV
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