Cement clinker and preparation thereof

A cement clinker and raw material technology, applied in the direction of cement production, etc., can solve the problems of clinker quality decline, difficult to burn, f-CaO content increase, etc., to achieve improved utilization rate, stable quality, and easy realization of grinding and calcination processes Effect

Active Publication Date: 2008-10-01
CHONGQING UNIV
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Problems solved by technology

In the article "Research on the Production of Green Cement Using Waste Concrete" written by Wan Huiwen and others in "Foreign Building Materials Science and Technology" in 2005, Volume 26, Issue 2, it is introduced to use 40%, 60%, and 80% of waste concrete to replace limestone to prepare cement. Cement clinker technology, the strength of the obtained cement clinker can reach 47.4MPa when the water-cement ratio is 0.32, but because of the river sand contained in the waste concrete, it is difficult to grind and burn, resulting in an increase in f-CaO content, The quality of the clinker decreases

Method used

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  • Cement clinker and preparation thereof
  • Cement clinker and preparation thereof
  • Cement clinker and preparation thereof

Examples

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Embodiment 1

[0025] Example 1: The waste concrete is taken from some demolished buildings or structures in the urban area of ​​Chongqing. The limestone, sandstone and sulfuric acid slag required for preparing cement raw meal powder are taken from the Lafarge Cement Factory in Chongqing, and from the Lafarge Cement Factory in Chongqing. The cement factory took the cement clinker used to prepare 42.5 ordinary Portland cement, and purchased 32.5 composite Portland cement, 42.5, 52.5 grades and Chongqing Diwei cement produced by Chongqing Lafarge Cement Factory from the market. The 42.5 grade ordinary Portland cement produced by the factory was used as a comparative analysis experiment. The design rate value of cement clinker is the same as the design rate value of cement clinker prepared by Chongqing Lafarge Cement Plant for 42.5 grade ordinary Portland cement, namely: lime saturation coefficient KH=0.93±0.02, aluminum rate IM=1.5± 0.1, silicon rate SM=2.5±0.1, press figure 1 The steps shown...

Embodiment 2

[0038] Example 2: The waste concrete is taken from some demolished buildings or structures in the urban area of ​​Chongqing, and the limestone, sandstone and sulfuric acid slag required for preparing cement raw meal powder are taken from the Chongqing Lafarge Cement Plant, and are obtained from the Chongqing Lafarge Cement Factory. The cement factory took the cement clinker used to prepare 42.5 grade ordinary Portland cement, purchased 32.5 composite Portland cement produced by Chongqing Lafarge Cement Factory, 42.5, 52.5 grades and Chongqing Diwei cement from the market The 42.5 grade ordinary Portland cement produced by the factory was used as a comparative analysis experiment. The design rate value of cement clinker is the same as the design rate value of cement clinker prepared by Chongqing Lafarge Cement Plant for 42.5 grade ordinary Portland cement, namely: lime saturation coefficient KH=0.93±0.02, aluminum rate IM=1.5± 0.1, silicon rate SM=2.5±0.1, press figure 1 The s...

Embodiment 3

[0051] Example 3: The waste concrete is taken from some demolished buildings or structures in the urban area of ​​Chongqing. The limestone, sandstone and sulfuric acid slag required for preparing cement raw meal powder are taken from the Chongqing Lafarge Cement Factory, and are obtained from the Chongqing Lafarge Cement Factory. The cement factory took the cement clinker used to prepare 42.5 grade ordinary Portland cement, purchased 32.5 composite Portland cement produced by Chongqing Lafarge Cement Factory, 42.5, 52.5 grades and Chongqing Diwei cement from the market The 42.5 grade ordinary Portland cement produced by the factory was used as a comparative analysis experiment. The design rate value of cement clinker is the same as the design rate value of cement clinker prepared by Chongqing Lafarge Cement Plant for 42.5 grade ordinary Portland cement, namely: lime saturation coefficient KH=0.93±0.02, aluminum rate IM=1.5± 0.1, silicon rate SM=2.5±0.1, press figure 1 The ste...

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Abstract

The invention pertains to a cement clinker and the technical field of cement clinker preparation, in particular to a cement clinker using waste gravels and concretes as main materials and a preparation method thereof. The composed raw materials according to weight percent content are: 37.0 to 77.0 percent of waste gravels and concretes, 21.0 to 52.0 percent of limestone, 0.5 to 8.5 percent of sandstone and 1.0 to 4.5 percent of pyrite cinder. In preparation, the waste gravels and concretes are dried, crushed and sieved for obtaining granules with the diameter of 5 to 20mm; the obtained granules are mixed with the limestone, the sandstone and the pyrite cinder and prepared into the cement clinker by the traditional technique. The cement prepared by the cement clinker of the invention has intensity grade up to grade 52.5 and can be used as a gelatinuous material for preparing concretes. The percentage of the waste gravels and concretes in the raw materials of the cement clinker can reach 80 percent, thus ensuring high utilization rate and finding a good utilization approach for resource utilization of the waste concretes.

Description

technical field [0001] The invention relates to cement clinker and a preparation method thereof, in particular to cement clinker with waste crushed stone concrete as the main raw material and a preparation method thereof. Background technique [0002] With the development of the country's economy and construction industry, a huge amount of waste concrete is produced every year due to the demolition of old buildings, and the generated construction waste has become a major source of waste pollution in the city. If these wastes are simply landfilled, it will undoubtedly cause environmental damage serious pollution and huge waste of energy. How to deal with these waste concrete has attracted great attention from the construction industry and environmental protection departments. Waste concrete is a kind of hardened concrete, mainly composed of hardened cement slurry (cement stone), sand and gravel aggregates, etc., of which sand and gravel aggregates account for 70% to 80%. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24
CPCC04B7/28Y02P40/10
Inventor 万朝均彭小芹李利袁启涛张廷雷刘立军李腾陈衡
Owner CHONGQING UNIV
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