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Low-alkali cement clinker, low-alkali high-strength cement, and preparation method thereof

A low-alkali cement and clinker technology, which is applied in the field of cement manufacturing, can solve problems such as high alkali content, engineering existence, and hidden dangers, and achieve the effects of sufficient reaction, uniform particle size distribution, and improved efficiency

Active Publication Date: 2020-10-02
南阳中联卧龙水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The low-alkali cement clinker has high compressive strength, but its alkali content is still high, which will still cause certain hidden dangers in the project when used

Method used

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  • Low-alkali cement clinker, low-alkali high-strength cement, and preparation method thereof
  • Low-alkali cement clinker, low-alkali high-strength cement, and preparation method thereof
  • Low-alkali cement clinker, low-alkali high-strength cement, and preparation method thereof

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preparation example Construction

[0051] The preparation method of the low-alkali high-strength cement of the present invention comprises the following steps: 1) uniformly mixing limestone, low-alkali sandstone, sulfuric acid slag, wet fly ash, and fluorine-containing iron ore, and grinding to obtain raw meal; 2) ) Preheating and decomposing the raw meal prepared in step 1), then sintering at 1100-1300°C for 30-40min, cooling to obtain low-alkali cement clinker; 3) making the cement clinker obtained in step 2) Mix it with mixed materials, grind it, and get it.

[0052] The particle size of limestone in step 1) is not greater than 70mm. Step 1) The particle size of the medium-low alkali sandstone is not greater than 80mm. The volume of the 80 μm sieve residue in the raw meal is not more than 10%.

[0053] The temperature of decomposition in step 2) is 890-950°C. The temperature of the cement clinker after cooling in step 2) is not higher than 85°C.

[0054] After preheating and decomposition, the temperatur...

Embodiment 1

[0057] The low-alkali cement clinker of this embodiment is made of the following raw materials in parts by weight: 810 parts of limestone, 50 parts of low-alkali sandstone, 35 parts of sulfuric acid slag, 80 parts of wet fly ash, and 12 parts of fluorine-containing iron ore.

[0058] Limestone is high-quality limestone, the mass fraction of CaO in limestone is 51.3%, the mass fraction of MgO is about 1.6%, R 2 The mass fraction of O is not more than 0.15%. In low alkali sandstone, SiO 2 The mass fraction of R is 86%, R 2 The mass fraction of O is not greater than 0.5%. Fe in sulfuric acid slag 2 o 3 The mass fraction of R is 67%. 2 The mass fraction of O is not greater than 0.5%. Moisture mass fraction in wet fly ash is 12%, Al 2 o 3 The mass fraction is 26%, R 2 The mass fraction of O is not greater than 1.6%. The mass fraction of calcium fluoride in the fluoride-containing iron ore is 14.6%.

[0059] The low-alkali high-strength cement of this embodiment is formed...

Embodiment 2

[0065] The low-alkali cement clinker of this embodiment is made of the following raw materials in parts by weight: 820 parts of limestone, 60 parts of low-alkali sandstone, 30 parts of sulfuric acid slag, 90 parts of wet fly ash, 15 parts of fluorine-containing iron ore, limestone 67 parts of mine waste.

[0066] Limestone is high-quality limestone, the mass fraction of CaO in limestone is 51.3%, the mass fraction of MgO is 1.8%, R 2 The mass fraction of O is not greater than 0.15%. In low alkali sandstone, SiO 2 The mass fraction of R is 86%, R 2 The mass fraction of O is not greater than 0.5%. Fe in sulfuric acid slag 2 o 3 The mass fraction of R is 67%. 2 The mass fraction of O is not greater than 0.5%. Moisture mass fraction in wet fly ash is 12%, Al 2 o 3 The mass fraction is 26%, R 2 The mass fraction of O is not greater than 1.6%. The mass fraction of calcium fluoride in the fluoride-containing iron ore is 14.6%.

[0067] Limestone mine waste is limestone mi...

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Abstract

The invention discloses low-alkali cement clinker, low-alkali high-strength cement and a preparation method thereof, and belongs to the technical field of cement manufacturing. The low-alkali cement clinker is mainly prepared from the following raw materials in parts by weight: 810-840 parts of limestone, 50-70 parts of low-alkali sandstone, 25-35 parts of sulfate slag, 80-100 parts of wet fly ashand 12-16 parts of fluorine-containing iron ore; wherein the mass fraction of CaO in the limestone is not less than 50%. The low-alkali high-strength cement comprises the low-alkali cement clinker and an admixture in a weight ratio of (55-75) : (25-45). The low-alkali cement clinker is low in alkalinity, high in later strength and suitable for bridge engineering construction, the probability thatcement prepared from the cement clinker cracks in the using process is reduced, and the service life of engineering is prolonged.

Description

technical field [0001] The invention relates to the technical field of cement manufacture, and more specifically relates to a low-alkali cement clinker, low-alkali high-strength cement and a preparation method thereof. Background technique [0002] With the acceleration of domestic infrastructure construction, the number of road and railway construction has increased significantly. When many roads and railways are constructed, bridges must be erected. In the Portland cement used in bridge construction, alkali (Na 2 O, K 2 O, etc.) content is high, after construction, the alkali in the cement will react with some components in the aggregate in the concrete to form a silicate gel, which will easily cause the volume of the concrete to increase and cause expansion stress. In severe cases It will also cause cracks in the concrete, which will cause potential safety hazards in the project. In order to avoid such potential safety hazards, a large amount of low-alkali cement will ...

Claims

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Application Information

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IPC IPC(8): C04B7/26C04B7/22C04B7/24C04B7/36C04B7/38C04B7/43C04B7/42
CPCC04B7/26C04B7/22C04B7/24C04B7/36C04B7/43C04B7/38C04B7/427C04B7/425Y02P40/10
Inventor 宋秀玲李春杰王景震
Owner 南阳中联卧龙水泥有限公司
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