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Method for reducing preparation cost of sulphoaluminate cement

A technology of sulphoaluminate cement and low cost, which is applied in the field of preparation of new building materials, can solve the problems of increased production cost of sulphoaluminate cement, decline of sulphoaluminate cement body performance, and difficulty in grasping the composition range of admixtures, etc. To achieve the effect of avoiding the decline of strength performance, reducing energy consumption and lowering the grade

Inactive Publication Date: 2020-08-07
肥西县创玺建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large amount of bauxite that needs to be consumed in the production of sulphoaluminate cement, the price is relatively expensive, and the requirements for the required aluminum-rich raw materials are high, which further leads to an increase in the production cost of sulphoaluminate cement.
The existing methods to reduce the cost of sulphoaluminate cement mostly adopt the method of adding mineral admixtures. However, the incorporation of a large amount of mineral admixtures generally reduces the strength of cement. Generally, when the amount of mineral admixture exceeds 20%, The strength of cement at all ages has decreased, and it is difficult to grasp the composition range of admixtures, which will cause a decrease in the performance of the sulphoaluminate cement body

Method used

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  • Method for reducing preparation cost of sulphoaluminate cement

Examples

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Comparison scheme
Effect test

Embodiment 1

[0018] A method for reducing the preparation cost of sulphoaluminate cement, wherein the fly ash is modified to obtain the modified fly ash as a bauxite substitute material for the preparation of sulphoaluminate cement clinker;

[0019] The fly ash modification method is as follows: grind 1.2 kg of fly ash through a 50-mesh sieve, place it in a reaction kettle, add 1.8 times the volume of water and 25 grams of modifier, heat up to 66 ° C, and use multi-functional stirring Stir with a mixer, keep stirring until the water content is between 11-14%, press it into a cake shape with a thickness of 2 cm, then place it in an oven at 290 ° C for 2 hours, and obtain modified fly ash after cooling. The described fly ash is Class II fly ash.

[0020] The preparation method of the modifying agent is as follows: take 30 grams of rare earth sol, 7.2 grams of polyacrylamide, and 0.32 grams of sodium hexametaphosphate, add 115 milliliters of polyethylene glycol aqueous solution with a molar c...

Embodiment 2

[0026] A method for reducing the preparation cost of sulphoaluminate cement, wherein the fly ash is modified to obtain the modified fly ash as a bauxite substitute material for the preparation of sulphoaluminate cement clinker;

[0027] The fly ash modification method is: grind 1.3 kg of fly ash through a 55-mesh sieve, place it in a reaction kettle, add 1.9 times the volume of water and 28 grams of modifier, heat up to 68 ° C, and use multi-functional stirring Stir with a mixer, keep stirring until the water content is between 11-14%, press it into a cake shape with a thickness of 2.5 cm, and then place it in an oven at 295 ° C for 2.5 hours, and obtain modified fly ash after cooling. The described fly ash is Class II fly ash.

[0028] The preparation method of the modifying agent is as follows: take 33 grams of rare earth sol, 7.3 grams of polyacrylamide, and 0.33 grams of sodium hexametaphosphate, add 118 milliliters of polyethylene glycol aqueous solution with a molar conc...

Embodiment 3

[0034] A method for reducing the preparation cost of sulphoaluminate cement, wherein the fly ash is modified to obtain the modified fly ash as a bauxite substitute material for the preparation of sulphoaluminate cement clinker;

[0035] The fly ash modification method is as follows: 1.4 kg of fly ash is ground through a 60-mesh sieve, placed in a reaction kettle, 2.0 times the volume of water and 30 grams of modifier are added, the temperature is raised to 70 ° C, and the mixture is stirred by multi-function Stir with a mixer, keep stirring until the water content is between 11-14%, press it into a cake shape with a thickness of 3 cm, then place it in an oven at 300°C for 3 hours, and obtain modified fly ash after cooling. The described fly ash is Class II fly ash.

[0036] The preparation method of the modifying agent is as follows: take 35 grams of rare earth sol, 7.4 grams of polyacrylamide, and 0.35 grams of sodium hexametaphosphate, add 120 milliliters of polyethylene gly...

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Abstract

The invention relates to the technical field of preparation of novel building materials, and discloses a method for reducing the preparation cost of sulphoaluminate cement. The method performs modification of fly ash, and the obtained modified fly ash is used as a bauxite substitute for preparing sulphoaluminate cement clinker; rare earth is used for activating hydration activity of mineral substances in the coal ash so as to provide early hydration strength for cement, and the stability of later activity is maintained; the method has a fast hydration speed, stimulates activity, exerts later strength, improves the microstructure of the sulphoaluminate cement slurry, inhibits the later strength from collapsing, is very beneficial to the performance development of sulphoaluminate cement, andreduces the production cost of cement. The prepared sulphoaluminate cement has the 3-day compressive strength of 56 MPa or above and the 28-day compressive strength of 78 MPa or above, fly ash is effectively utilized, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of new building materials, and in particular relates to a method for reducing the preparation cost of sulphoaluminate cement. Background technique [0002] Sulphoaluminate cement is independently researched and invented by China Academy of Building Materials Science. In 2000, the output of sulphoaluminate cement in my country was only 672,500 tons. By 2005, my country's sulfur (iron) aluminate cement output reached 1.253 million tons. There are 30 enterprises producing sulphoaluminate cement in my country, and the national output of sulphoaluminate cement is basically stable at about 1.25 million tons. Sulphoaluminate cement has the characteristics of early strength and high strength, so it is widely used in special construction engineering fields such as hydraulic engineering and rapid repair engineering. Compared with general-purpose Portland cement, sulfoaluminate cement has the advantag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/32C04B7/26C04B7/147C04B7/38C04B7/44
CPCC04B7/147C04B7/26C04B7/323C04B7/38C04B7/44Y02P40/10
Inventor 郭平
Owner 肥西县创玺建材科技有限公司
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