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Method for preparing calcium sulfoaluminate-alite-belite-iron phase system cement clinker by phase separation combination

A technology of calcium sulfoaluminate and cement clinker, which is applied in the field of cement clinker, can solve the problems of high formation temperature of tricalcium silicate, difficulty in production operation, and decomposition of tricalcium silicate, so as to avoid abnormal setting time and reduce The difficulty of preparation and the effect of improving performance

Active Publication Date: 2018-06-01
UNIV OF JINAN
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Problems solved by technology

Although this patent solves the problem that tricalcium silicate and calcium sulfoaluminate are difficult to coexist in the preparation process, when the calcination temperature exceeds 1350°C, the decomposition of gypsum in the raw material will lead to a higher formation temperature of tricalcium silicate and consume More fuel; secondly, in the cooling process, it is easy to cause tricalcium silicate to decompose, and there are also problems such as difficulties in actual production and operation

Method used

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  • Method for preparing calcium sulfoaluminate-alite-belite-iron phase system cement clinker by phase separation combination
  • Method for preparing calcium sulfoaluminate-alite-belite-iron phase system cement clinker by phase separation combination
  • Method for preparing calcium sulfoaluminate-alite-belite-iron phase system cement clinker by phase separation combination

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preparation example Construction

[0029] The preparation method of calcium sulfoaluminate-Alite-Beilite-iron phase system cement clinker of the present invention, the burning of clinker takes the electric furnace method as an example, and concrete steps are as follows:

[0030] 1. According to the principle of preparation of mineral combinations with the same temperature range formed by calcination, the present invention divides cement clinker into C 3 S-C 2 There are two groups of S-iron phase system clinker and sulphoaluminate cement clinker (that is, calcium sulphoaluminate-dicalcium silicate-iron phase system clinker), among which sulphoaluminate cement clinker is commercially available. During preparation, first calculate C according to the mineral composition of the calcium sulfoaluminate-Alite-Beilite-iron phase system cement clinker and the mineral composition of the existing sulfoaluminate cement clinker 3 S-C 2 The percentage content of each mineral in the clinker of the S-iron phase system.

[00...

Embodiment approach

[0037] Further, the mineral composition of the sulphoaluminate cement clinker of the present invention is: calcium sulphoaluminate, belite or dicalcium silicate, iron phase, anhydrous calcium sulfate; C 3 S-C 2 The mineral composition of the clinker in the S-iron phase system is: alite, belite, iron phase, and free calcium oxide. The mineral composition content of sulfoaluminate cement clinker is (wt%): calcium sulfoaluminate 50-70%, dicalcium silicate 15-30%, iron phase 2-10%, anhydrous calcium sulfate 0-8% , Free calcium oxide 0-0.5%. In the preferred embodiment of the present invention, the mineral composition content of the sulphoaluminate cement clinker used is (wt%): 65% calcium sulphoaluminate, 23.1% belite dicalcium silicate, 6.1% iron phase, no Calcium sulfate water 5.51%, free calcium oxide 0.29%; the chemical formula of the iron phase is C 4 A x f 2-x , 0≤X<2.

[0038] In the case of sulphoaluminate cement clinker with the above mineral composition content, C ...

Embodiment 1

[0044] The mineral composition of sulphoaluminate cement clinker was calculated by Rietveld full spectrum fitting, and the results are shown in Table 1. figure 1 is the XRD pattern of sulphoaluminate cement clinker. C 3 S-C 2 The rate value of clinker in S-iron phase system is KH=0.86, SM=3.09, IM=0.64.

[0045]

[0046] Ingredients: The amount of raw material is calculated according to the three rate values, and the specific oxide ratio is shown in Table 2. Wet mixing is adopted, according to raw material: ball: water = 1:1:1. Put the weighed sample into a sealed mixing tank, ball mill and mix for 1-2 hours, then take it out and dry it. Mix the raw material evenly, add about 7-10wt% water, use a φ40 mm*40 mm mold, press the load 15-20 MPa, and press it into a 10-15 g green sheet.

[0047] Firing system: calcining the green sheet, raising the temperature to 800-1000°C at a rate of 5°C / min, holding it for 40 minutes, then raising the temperature at a rate of 3°C / min to ...

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Abstract

The invention discloses a method for preparing calcium sulfoaluminate-alite-belite-iron phase system cement clinker by a phase separation combination. The calcium sulfoaluminate-alite-belite-iron phase system cement clinker is prepared by uniformly mixing tricalcium silicate-dicalcium silicate-iron phase system clinker and calcium sulfoaluminate-belite-iron phase system clinker (namely, sulphate aluminium cement clinker) which are different in a calcination formation temperature interval according to a principle of preparing minerals with the same calcination formation temperature interval together and preparing minerals with different calcination formation temperature intervals separately. The difficult problems that the preparation of tricalcium silicate and calcium sulfoaluminate is difficult and sulfur trioxide in gypsum inhibits the formation of alite are solved, the preparation difficulty is reduced, the technological operation flow is simplified and the performance of the cementclinker is improved. The early strength and later strength of the obtained cement clinker are both high and the setting time is controllable. The early strength and the later strength are matched anddeveloped. In addition, no aluminate mineral exists in the cement clinker, thereby avoiding the occurrences of abnormal setting time, poor adaptability of an admixture and the like.

Description

technical field [0001] The invention relates to a method for preparing cement clinker, in particular to a method for preparing high-performance calcium sulfoaluminate-alite-beilite-iron phase system cement clinker by using a phase separation and combination method, which belongs to cement clinker technology field. Background technique [0002] Alite-sulfoaluminate cement is a kind of portland cement modified by calcium sulfoaluminate with development prospect. The cement introduces an appropriate amount of calcium sulfoaluminate into the traditional Portland cement clinker to replace tricalcium aluminate, and at the same time introduces a small amount of calcium sulfate, burns at 1250 ° C ~ 1350 ° C, and then adds an appropriate amount of gypsum, mixes materials etc. The general range of the clinker mineral composition of the cement is (wt%): the content of tricalcium silicate is 30% to 50%, the content of dicalcium silicate is 30% to 40%, and the content of calcium sulfoa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/48C04B7/52
CPCC04B7/48C04B7/52
Inventor 叶正茂李传海卢晓磊王树贤程新
Owner UNIV OF JINAN
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