Sulphoaluminate cement and preparation method thereof

A technology of sulfoaluminate cement and calcium sulfosilicate, which is applied in the field of cement preparation, can solve problems such as harmful minerals, achieve high early strength, simple preparation, and reduce consumption

Inactive Publication Date: 2015-05-13

CHONGQING UNIV

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AI-Extracted Technical Summary

Problems solved by technology

[0004] However, in the prior art, the general view is that calcium su...

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Abstract

The invention discloses sulphoaluminate cement. The sulphoaluminate cement is characterized by containing 5%-35% by mass of calcium sulphosilicate mineral. The invention further discloses a preparation method of the sulphoaluminate cement. The preparation method is characterized in that the fired clinker contains calcium sulphosilicate, and comprises the following steps of firstly, calcining a raw material according to a proper calcination process in preparation; carrying out secondary calcination according to the set calcination temperature and heat preservation time; and grinding secondarily calcined cement clinker and additive gypsum to prepare the sulphoaluminate cement. The sulphoaluminate cement is simple to prepare, convenient to implement and low in cost; the later strength shrinkage problem of the sulphoaluminate cement can be improved; meanwhile, the calcium sulphate content can be improved; the silicate waste residues with high calcium sulphate content are digested; and the production and application ranges of the sulphoaluminate cement are expanded.

Technology Topic

AluminateClinker (waste) +4

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Examples

Experimental program(3)

Example Embodiment

[0032] Example 1:

[0033] A method for preparing sulfoaluminate cement containing calcium sulfosilicate mineral, the specific implementation steps are as follows:

[0034] a. Preparation of cement raw meal:

[0035] 56 parts by mass of limestone, 27 parts by mass of alumina, and 17 parts by mass of phosphogypsum, and then all the components are ground together to a fineness of 100-200 mesh to obtain raw material ingredients.

[0036] b. Preparation of cement clinker:

[0037] Place the raw meal prepared in step a in a rotary kiln for the first calcination, control the calcination temperature to 1350°C and the calcination time to 30min to obtain cement clinker; then calcinate the clinker again, and control the calcination temperature to 1200°C for holding time It is 60 minutes; the clinker is cooled by a castor-type cooler to obtain sulfoaluminate cement clinker containing calcium sulfosilicate minerals.

[0038] c. Preparation of cement:

[0039] Add 5 parts by mass of natural dihydrate gypsum to the cement clinker fired in step b. After the mixture is evenly mixed, it is ground by a ball mill to a specific surface area of 330 m 2 /kg, made into cement products.

[0040] In the above-mentioned step b, the belite and high-temperature anhydrite formed in the first calcination process are recombined at a low temperature of 1200°C to form calcium sulfosilicate.

[0041] It has been verified by testing that in the above step b, the calcium sulfosilicate content in the sulphoaluminate cement clinker obtained by firing is 20%.

Example Embodiment

[0042] Example 2:

[0043] A preparation method for producing sulfoaluminate cement containing calcium sulfosilicate mineral by adopting a secondary calcination process, the specific implementation steps are as follows:

[0044] a. Preparation of cement raw meal:

[0045] 55 parts by mass of limestone, 20 parts by mass of bauxite, 5 parts by mass of sandstone, and 20 parts by mass of phosphogypsum, and then each component is ground and mixed to a fineness of 100-200 meshes to obtain raw material ingredients.

[0046] b. Preparation of cement clinker:

[0047] Place the raw meal prepared in step a in a rotary kiln for the first calcination, control the calcination temperature to 1300 ℃ and the calcination time to 30 minutes to obtain cement clinker, and then calcinate the clinker again to control the calcination temperature to 1150 ℃ for heat preservation For 120 minutes, the clinker is cooled by a castor-type cooler to obtain sulfoaluminate cement clinker.

[0048] c. Preparation of cement:

[0049] Add 5 parts by mass of natural dihydrate gypsum to the cement clinker fired in step b, mix it evenly, and grind it with a ball mill to a specific surface area of 300-450 m 2 /kg, made into cement products.

[0050] It has been verified by testing that in the above step b, the calcium sulfosilicate content in the sulphoaluminate cement clinker obtained by firing is 20%.

Example Embodiment

[0051] Example 3:

[0052] A kind of preparation method that adopts secondary calcination process to produce the sulfoaluminate cement containing calcium sulfosilicate mineral, concrete implementation steps are as follows:

[0053] a. Preparation of cement raw meal: 50 parts by mass of limestone, 30 parts by mass of electrolytic manganese slag, and 20 parts by mass of bauxite, and then each component is ground to a fineness of 100-200 mesh to obtain raw material ingredients.

[0054] b. Preparation of cement clinker:

[0055] Place the raw meal prepared in step a in a rotary kiln for the first calcination, control the calcination temperature to 1350°C and the calcination time to 30min to obtain cement clinker, and then calcinate the clinker again to control the calcination temperature to 1220°C for heat preservation For 120 minutes, the clinker is cooled by a castor-type cooler to obtain sulphoaluminate cement.

[0056] c. Preparation of cement:

[0057] Add 5 parts by mass of natural dihydrate gypsum to the cement clinker fired in step b, mix it evenly, and grind it with a ball mill to a specific surface area of 300-450m 2 /kg, made into cement products.

[0058] Tests have verified that in the above step b, the calcium sulfosilicate content in the sulphoaluminate cement clinker obtained by firing is 26%.

[0059] The sulfoaluminate cement containing calcium sulfosilicate minerals calcined in the above three examples was used to prepare standard specimens. The strength measured according to the national standard GB/T 17671-1999 "Cement Strength Test Method" is shown in the table 1 shown.

[0060] Table 1 The compressive strength of the cement prepared in each example

[0061]

[0062] According to the above table, it can be seen that the sulphoaluminate cement prepared by the present invention can significantly improve the later strength of concrete.

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Classification and recommendation of technical efficacy words

Improve early strength
Reduce the ratio

Sulphoaluminate cement and preparation method thereof

A technology of sulfoaluminate cement and calcium sulfosilicate, which is applied in the field of cement preparation, can solve problems such as harmful minerals, achieve high early strength, simple preparation, and reduce consumption

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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