A method for increasing the content of tricalcium silicate in Portland cement powder

A technology for Portland cement and tricalcium silicate is applied in the field of increasing the content of tricalcium silicate mineral crystals in cement powder, which can solve the problems of unobtained and other problems, and achieve the effects of low energy consumption and simple separation and enrichment process.

Inactive Publication Date: 2019-07-02
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, limited by the level of technology and technical and economic indicators, the manufacture of high-strength Portland cement has encountered bottlenecks, and the space for increasing the content of tricalcium silicate in clinker is limited, and it is difficult to exceed 70%.
For example: during the implementation of the high-strength cement scientific research project in the 973 plan in China, researchers increased the content of tricalcium silicate in the clinker by studying reasonable calcination measures to increase the strength of cement and prepare high-strength cement, but they did not achieve the expected desired effect

Method used

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  • A method for increasing the content of tricalcium silicate in Portland cement powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 20 grams of 15% Portland cement with 45 micron sieves to a centrifuge tube, add 100 ml of 1# heavy liquid, and centrifuge at 8000 rpm for 5 minutes, then pour out the heavy liquid and the upper layer of cement powder, such as For 2# heavy liquid, centrifuge at 8000rpm for 5 minutes, pour out the heavy liquid and the upper layer of cement powder, and filter to obtain the upper layer of cement powder. The XRD test results are shown in the attached figure 1 , from which it can be seen that tricalcium silicate is significantly improved, and the semi-quantitative analysis of tricalcium silicate content exceeds wt80%.

Embodiment 2

[0018] 20 grams of Portland cement with 15% of 45 micron sieve, add 120 ml of 1# heavy liquid to the centrifuge tube, centrifuge at 10000rpm for 8 minutes, pour out the heavy liquid and the upper layer of cement powder, such as For 2# heavy liquid, centrifuge at 10000rpm for 8 minutes, pour out the heavy liquid and the upper layer of cement powder, and filter to obtain the upper layer of cement powder. The XRD test results are shown in the attached figure 1 , from which it can be seen that tricalcium silicate is significantly improved, and the semi-quantitative analysis of tricalcium silicate content exceeds wt83%.

Embodiment 3

[0020] Add 20 grams of 19% Portland cement with a 45-micron sieve to the centrifuge tube, add 110 ml of 1# heavy liquid, and centrifuge at 9000 rpm for 9 minutes, then pour out the heavy liquid and the upper layer of cement powder, such as For 2# heavy liquid, centrifuge at 9000rpm for 9 minutes, pour out the heavy liquid and the upper layer of cement powder, and filter to obtain the upper layer of cement powder. The XRD test results are shown in the attached figure 1 , from which it can be seen that tricalcium silicate is significantly improved, and the semi-quantitative analysis of tricalcium silicate content exceeds wt82%.

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Abstract

The invention relates to a method for increasing tricalcium silicate content of Portland cement powder. The method comprises the following steps: adding the Portland cement powder into a heavy fluid 1, uniformly mixing, centrifuging, and taking a lower-layer sample after centrifugation, wherein the heavy fluid 1 is obtained by blending diiodomethane and tetrabromoethane according to a volume ratio of 0.53: 1; adding a heavy fluid 2 into the lower-layer sample, uniformly mixing, centrifuging, and taking an upper-layer sample after centrifugation as the Portland cement powder with high tricalcium silicate content, wherein the heavy fluid 2 is obtained by blending diiodomethane and tetrabromoethane according to a volume ratio of 2: 1. The method is simple in process; increase in tricalcium silicate in cement clinker is achieved by changing improvement in the cement clinker calcining process into physical sorting after calcining; and the method is insusceptible to dosing and calcining process factors and the like.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic building materials, and in particular relates to a method for increasing the content of tricalcium silicate mineral crystals in cement powder. Background technique [0002] The core issue in the manufacture of high-strength Portland cement in industry is to increase the content of tricalcium silicate in the clinker. In the existing technology, the cement is calcined with a higher saturation coefficient of limestone in the calcination process to increase the content of tricalcium silicate. Thereby improving the quality of cement. [0003] However, limited by the level of technology and technical and economic indicators, the manufacture of high-strength Portland cement has encountered a bottleneck, and the space for increasing the content of tricalcium silicate in clinker is limited, and it is difficult to exceed 70%. For example: during the implementation of the high-strength cement scientifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/36C04B7/04
CPCC04B7/04C04B7/36
Inventor 赵鹏景明海刘盖张哲周琳林
Owner CHANGAN UNIV
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