Portland cement made from self-pulverized clinker and slag and preparation method for Portland cement

A Portland cement and clinker technology, applied in the field of building materials, can solve the problems of high clinker calcination temperature, poor carbonization resistance, and serious surface sanding, and achieve low calcination temperature, low cost, and excellent carbonation resistance Effect

Inactive Publication Date: 2012-06-13
WUHAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the self-powdering clinker slag Portland cement of the present invention, the above cements have poor carbonation resistance in the air, and after serving for a long time, the strength shrink

Method used

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  • Portland cement made from self-pulverized clinker and slag and preparation method for Portland cement
  • Portland cement made from self-pulverized clinker and slag and preparation method for Portland cement
  • Portland cement made from self-pulverized clinker and slag and preparation method for Portland cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the lime saturation coefficient of clinker (KH) = 0.667, silicon rate (SM) = 3.5, aluminum rate (IM) = 2.2 to prepare raw material, calcined at 1230 ° C for 1 hour, slowly cooled to room temperature after taking out (cooling rate 45-15°C / min), during which all the clinker will be pulverized by itself and stored for later use.

[0024] The slag, natural anhydrite and self-pulverizing clinker were ground separately, and the specific surface area of ​​the slag was measured to be 425m 2 / kg; Anhydrite specific surface area 410m 2 / kg; Self-pulverizing clinker 368m 2 / kg, sealed for future use.

[0025] The slag powder, gypsum powder and self-pulverizing clinker powder prepared above were uniformly mixed according to the ratio in Table 1 to prepare self-pulverizing clinker slag Portland cement. According to GB17671-1999 "Cement Mortar Strength Test Method", the 3-day and 28-day strength of the sample and the strength of the 7-day carbonization after 28 days o...

Embodiment 2

[0030] According to the lime saturation coefficient of clinker (KH) = 0.667, silicon rate (SM) = 3.5, aluminum rate (IM) = 2.2 to prepare raw material, calcined at 1230 ° C for 1 hour, slowly cooled to room temperature after taking out (cooling rate 45~15°C / min), during which all the clinker will be pulverized by itself and set aside.

[0031] After mixing the slag, natural anhydrite and self-powdering clinker according to the ratio shown in Table 2, they are then ground to a specific surface area of ​​410m 2 / kg to prepare self-pulverizing clinker slag Portland cement with various ratios, and the performance test results are shown in Table 2.

[0032] Table 2. Proportion and performance of self-pulverizing clinker slag Portland cement prepared by mixed grinding

[0033]

[0034]

[0035] Table 2 shows that the carbonization 7-day flexural strength of the present invention is ≥3.3 MPa, indicating that the present invention can significantly improve the carbonization res...

Embodiment 3

[0037] Prepare the raw meal according to the clinker rate value shown in Table 3, mix it evenly and calcinate at 1260°C for 1 hour, take it out and cool it slowly to room temperature (cooling rate is 45-15°C / min), during which the clinker will completely powder itself change. Grind the obtained clinkers of each number to a specific surface area of ​​360m 2 / kg or so, spare.

[0038] Get the slag (surface area 425m2) that makes in embodiment 1 2 / kg), anhydrite (specific surface area 410m 2 / kg), and each number obtained in the present embodiment is self-pulverized clinker (the about 360m of specific surface area 2 / kg), molded according to the ratio in Table 4 and tested its performance, the results are shown in Table 4.

[0039] Table 3. Pulverization of clinker with different ratio values

[0040]

[0041] Table 4. Effects of self-pulverizing clinker with different rate values ​​on cement properties

[0042]

[0043]

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Abstract

The invention belongs to the technical field of building materials, and particularly relates to a Portland cement made from self-pulverized clinker and slag and a preparation method for the Portland cement. The Portland cement made from the self-pulverized clinker and the slag is characterized in that the Portland cement is made from the slag, plaster and the self-pulverized clinker by means of mixing and comprises 57%-87% of the slag, 3%-18% of the plaster and 1%-30% of the self-pulverized clinker in weight percent. The self-pulverized clinker is prepared according to the steps of preparing cement raw materials by means of arbitrary combination of the lime saturation coefficient ranging from 0.589 to 0.823, the silica ratio ranging from 2.5 to 4.0 and the alumina ratio ranging from 1.0 to 2.8 of the clinker; and grinding the cement raw materials to the degree with screen residues smaller than 18% by means of sieving of a sieve with the 0.08mm side length of a sieve mesh, calcining the grinded cement raw materials for 0.5 hour to 1.5 hours at the high temperature ranging from 1200 DEG C to 1380 DEG C prior to slowly cooling to the room temperature with the cooling rate of 15-45 DEG C /min, and obtaining the self-pulverized clinker. The method is simple in process, low in calcining temperature and low in grinding power consumption, and carbonization resistance of the Portland cement can be improved by the method.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a self-powdering clinker slag portland cement and a preparation method thereof. Background technique [0002] Gypsum is a raw material in the cement industry, and is usually used as a retarder for cement. The amount of gypsum in Portland cement is generally about 5% by mass. Gypsum resources are abundant, especially industrial by-product gypsum, such as phosphogypsum, desulfurized gypsum, fluorine gypsum, etc., which have not been effectively utilized at present, which not only causes waste of resources, but also causes environmental pollution. Therefore, rational use of industrial by-product gypsum, turning waste into treasure, and reducing or completely eliminating its harm to the environment have become urgent issues to be considered at this stage. [0003] Slag is the industrial waste slag discharged during the smelting process of iron and steel plants...

Claims

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Application Information

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IPC IPC(8): C04B7/14C04B7/147
CPCY02P40/10
Inventor 林宗寿毛芊赵前刘金军李大志万齐才
Owner WUHAN UNIV OF TECH
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