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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the prior art, the general view is that calcium sulfosilicate is an inert mineral, and even considered a harmful mineral

Method used

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  • Sulphoaluminate cement and preparation method thereof

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Effect test

Embodiment 1

[0033] A method for preparing sulfoaluminate cement containing calcium sulfosilicate minerals, 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 bauxite, and 17 parts by mass of phosphogypsum, and then grind each component together to a fineness of 100-200 mesh to obtain raw meal ingredients.

[0036] b. Preparation of cement clinker:

[0037] Put the raw meal prepared in step a into a rotary kiln for the first calcining, control the calcining temperature to 1350°C and calcining time for 30 minutes to obtain cement clinker; then calcinate the clinker again, control the calcining temperature to 1200°C for the holding time 60 minutes; the clinker is cooled by a grate cooler to obtain sulphoaluminate cement clinker containing calcium sulphosilicate minerals.

[0038] c. Preparation of cement:

[0039] Add 5 parts by mass of natural dihydrate gypsum to the cement clinker burn...

Embodiment 2

[0043] A method for preparing sulfoaluminate cement containing calcium sulfosilicate minerals 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 grind and mix each component to a fineness of 100-200 mesh to obtain raw meal ingredients.

[0046] b. Preparation of cement clinker:

[0047] Put the raw meal prepared in step a into a rotary kiln for the first calcining, control the calcining temperature to 1300°C and calcining time for 30 minutes to obtain cement clinker, then calcinate the clinker again and control the calcining temperature to 1150°C to keep it warm After 120 minutes, the clinker was cooled by a grating cooler to obtain sulphoaluminate cement clinker.

[0048] c. Preparation of cement:

[0049] Add 5 parts by mass of natural dihyd...

Embodiment 3

[0052] A method for preparing sulfoaluminate cement containing calcium sulfosilicate minerals by adopting a secondary calcination process, the specific 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, 20 parts by mass of bauxite, and then grind each component together to a fineness of 100-200 mesh to obtain raw meal ingredients.

[0054] b. Preparation of cement clinker:

[0055] Put the raw meal prepared in step a into a rotary kiln for the first calcining, control the calcining temperature to 1350°C and calcining time for 30 minutes to obtain cement clinker, then calcinate the clinker again and control the calcining temperature to 1220°C to keep it warm After 120 minutes, the clinker was cooled by a grate cooler to obtain sulphoaluminate cement.

[0056] c. Preparation of cement:

[0057] Add 5 parts by mass of natural dihydrate gypsum to the cement clinker burne...

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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.

Description

technical field [0001] The invention relates to the technical field of cement preparation; in particular, it relates to a sulphoaluminate cement and a preparation method thereof. Background technique [0002] When cement concrete is being poured, how to ensure and improve its later strength to ensure the strength of the final component has been the focus of attention and research by those skilled in the art. In particular, some special cements with low strength in the later stage, such as sulfoaluminate cement, have high early strength, excellent frost resistance, impermeability, corrosion resistance and other durability, and are used in negative temperature construction, underground, rapid repair projects and In industries such as prefabricated products, the lack of strength in the later stage, especially the shrinkage of the flexural strength in the later stage, requires continuous improvement and perfection. At the same time, as a special cement, sulfoaluminate cement re...

Claims

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Application Information

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IPC IPC(8): C04B7/32
Inventor 钱觉时孙化强沈燕余金城刘娜黄永波
Owner CHONGQING UNIV
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