Calcium sulfosilicate sulfoaluminate cement and preparation method thereof

A technology of calcium sulfosilicate sulfoaluminate and cement, which is applied in cement production, clinker production, etc., can solve the problems of increasing energy consumption in the preparation of sulfur-containing calcium sulfoaluminate cement clinker, and achieve easy grinding Good performance, reduced CO2 emissions, and low content

Active Publication Date: 2019-04-23
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 necessary to promote the calcium sulfosilicate minerals at a lower secondary calcination temperature. Formation, which to some extent increases the energy consumption and CO 2 emissions

Method used

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  • Calcium sulfosilicate sulfoaluminate cement and preparation method thereof
  • Calcium sulfosilicate sulfoaluminate cement and preparation method thereof
  • Calcium sulfosilicate sulfoaluminate cement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Calcium sulfosilicate sulfoaluminate cement was prepared as follows:

[0033] A. Preparation of cement raw meal

[0034] Mix 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, and then grind the prepared raw meal through a 100-mesh sieve to obtain cement raw meal.

[0035] B. Preparation of cement clinker

[0036] Put the raw material obtained in A into a high-temperature furnace for calcination, and 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 air to obtain calcium sulfosilicate Sulphoaluminate cement clinker, figure 1 It is the XRD spectrum of the cement clinker of this implementation. According to 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$: 7.79, C ...

Embodiment 2

[0038] Calcium sulfosilicate sulfoaluminate cement was prepared as follows:

[0039] A. Preparation of cement raw meal

[0040]Mix 67.64 parts by mass of limestone, 40.67 parts by mass of phosphogypsum, 38.84 parts by mass of bauxite, and 0.48 parts by mass of fly ash, and then grind the prepared raw meal through a 100-mesh sieve to obtain cement raw meal.

[0041] B. Preparation of cement clinker

[0042] The raw material obtained in A is calcined in a high-temperature furnace, and the high-temperature furnace is raised from room temperature to 1130°C, and kept at 1130°C for 60 minutes, and then the clinker is taken out of the high-temperature furnace and quenched in air to obtain calcium sulfosilicate Sulphoaluminate cement clinker, figure 2 It is the XRD spectrum of the cement clinker of this implementation. According to 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$: 5.83%, C 2 S:...

Embodiment 3

[0044] Calcium sulfosilicate sulfoaluminate cement was prepared as follows:

[0045] A. Preparation of cement raw meal

[0046] Mix 67.64 parts by mass of limestone, 40.67 parts by mass of fluorogypsum, 38.84 parts by mass of bauxite, and 0.48 parts by mass of fly ash, and then grind the prepared raw meal through a 100-mesh sieve to obtain cement raw meal.

[0047] B. Preparation of cement clinker

[0048] Put the raw material obtained in A into a high-temperature furnace for calcination, and 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 air to obtain calcium sulfosilicate Sulphoaluminate cement clinker, image 3 It is the XRD spectrum of the cement clinker of this implementation. According to 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$: 8.79, C ...

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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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Patent Type & Authority Patents(China)
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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