Calcium sulfo-silicate sulfo-aluminate cement and preparation method thereof

A calcium sulfosilicate sulfoaluminate cement technology, which is applied in cement production and clinker production, can solve the problems of increasing energy consumption in the preparation of sulfur-containing calcium sulfoaluminate cement clinker, and achieve easy grinding Good performance, reduce CO2 emissions, and improve mechanical properties

Active Publication Date: 2017-08-08
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The calcination temperature of sulfoaluminate cement clinker is above 1250°C. In order to make calcium sulfosilicate minerals exist in sulfoaluminate cement clinker, it is usually

Method used

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  • Calcium sulfo-silicate sulfo-aluminate cement and preparation method thereof
  • Calcium sulfo-silicate sulfo-aluminate cement and preparation method thereof
  • Calcium sulfo-silicate sulfo-aluminate cement and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0031] Example one

[0032] Prepare calcium sulfosilicate sulfoaluminate cement in the following way:

[0033] A. Preparation of cement raw meal

[0034] 71.39 parts by mass of limestone, 43.34 parts by mass of phosphogypsum, 6.22 parts by mass of kaolin, and 18.24 parts by mass of fly ash were mixed, and then the prepared raw meal was ground through a 100-mesh sieve to prepare cement raw meal.

[0035] B. Preparation of cement clinker

[0036] The raw meal obtained in A is calcined in a high-temperature furnace. The high-temperature furnace is raised from room temperature to 1130°C and kept at 1130°C for 30 minutes. Then the clinker is taken out of the high-temperature furnace and quenched in the air to obtain calcium sulfosilicate Sulphoaluminate cement clinker, figure 1 This is the XRD pattern of the cement clinker used in this implementation. After Rietveld quantitative analysis, the mineral composition of cement clinker is: C 4 A 3 $: 21.26%, C 5 $ 2 S: 60.41%, C 3 A: 8.05% C$: 7...

Example Embodiment

[0037] Example two

[0038] Prepare calcium sulfosilicate sulfoaluminate cement in the following way:

[0039] A. Preparation of cement raw meal

[0040] 67.64 parts by mass of limestone, 40.67 parts by mass of phosphogypsum, 38.84 parts by mass of alumina, and 0.48 parts by mass of fly ash are mixed, and then the prepared raw meal is ground through a 100-mesh sieve to prepare cement raw meal.

[0041] B. Preparation of cement clinker

[0042] The raw meal obtained in A is calcined in a high-temperature furnace. The high-temperature furnace is raised from room temperature to 1130°C and kept at 1130°C for 60 minutes. Then the clinker is taken out of the high-temperature furnace and quenched in the air to obtain calcium sulfosilicate Sulphoaluminate cement clinker, figure 2 This is the XRD pattern of the cement clinker used in this implementation. After Rietveld quantitative analysis, the mineral composition of cement clinker is: C 4 A 3 $: 36.21%, C 5 $ 2 S: 42.00%, C 3 A: 9.21 C$: 5....

Example Embodiment

[0043] Example three

[0044] Prepare calcium sulfosilicate sulfoaluminate cement in the following way:

[0045] A. Preparation of cement raw meal

[0046] 67.64 parts by mass of limestone, 40.67 parts by mass of fluorogypsum, 38.84 parts by mass of alumina, and 0.48 parts by mass of fly ash are mixed, and then the prepared raw meal is ground through a 100-mesh sieve to prepare cement raw meal.

[0047] B. Preparation of cement clinker

[0048] The raw meal obtained in A is calcined in a high-temperature furnace. The high-temperature furnace is raised from room temperature to 1150°C and kept at 1150°C for 60 minutes. Then the clinker is taken out of the high-temperature furnace and quenched in the air to obtain calcium sulfosilicate Sulphoaluminate cement clinker, image 3 This is the XRD pattern of the cement clinker used in this implementation. After Rietveld quantitative analysis, the mineral composition of cement clinker is: C 4 A 3 $: 35.17%, C 5 $ 2 S: 45.58%, C 3 A: 10.02 C$: 8...

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Abstract

The invention discloses calcium sulfo-silicate sulfo-aluminate cement and a preparation method thereof. A main mineral phase of clinker of the cement comprises the following ingredients in parts by mass: 5-40 parts of C4(AxF1-x)3$, 20-65 parts of C5S2$, 5-15 parts of C$ and 5-20 parts of C3A. The preparation method comprises the steps of calcining crude materials of the cement once at the temperature of 1,050 DEG C to 1,200 DEG C, and carrying out heat preservation for 1 hour or less, thereby preparing the cement. According to the calcium sulfo-silicate sulfo-aluminate cement and the preparation method thereof, the energy consumption and CO2 discharge of preparation of the cement clinker are lowered to a large extent, and the calcined clinker has good grindability. The calcium sulfo-silicate sulfo-aluminate cement presents good early mechanical properties, calcium sulfoaluminate minerals are basically hydrated completely at a seventh day, and calcium sulfo-silicate minerals already start to hydrate at a seventh day, so that the problem of sulfo-aluminate cement that later strength is lowered is solved; dihydrate gypsum generated from the hydration of calcium sulfo-silicate can be converted into mono-sulfur calcium sulfo-aluminate hydrate from tri-sulfur calcium sulfo-aluminate hydrate.

Description

technical field [0001] The invention belongs to the technical field of cement preparation, and in particular relates to calcium sulfosilicate sulfoaluminate cement and a preparation method thereof. Background technique [0002] High-sulfur calcium sulfoaluminate hydrate is one of the main hydration products of sulfoaluminate cement, and the strength of sulfoaluminate cement is mainly provided by high-sulfur calcium sulfoaluminate hydrate. With the hydration of sulfoaluminate cement, the calcium sulfate is gradually consumed, and the SO in the pore solution of the hardened slurry 4 2- When the concentration decreases, the high-sulfur calcium sulfoaluminate hydrate transforms into the low-sulfur calcium sulfoaluminate hydrate, which leads to the later strength shrinkage of the sulfoaluminate cement. Therefore, improving the late strength of sulphoaluminate cement has become the focus of sulphoaluminate cement research. [0003] Calcium sulfosilicate mineral is an intermedia...

Claims

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Application Information

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IPC IPC(8): C04B7/32C04B7/44C04B7/47
CPCC04B7/32C04B7/44C04B7/47Y02P40/10Y02P40/121
Inventor 钱觉时刘从振黄永波梁娇刘娜尹道道秦继辉
Owner CHONGQING UNIV
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