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Calcium aluminate cement preparing method

A technology of calcium aluminate cement and calcium carbonate, which is applied in the field of inorganic non-metallic materials, can solve the problems of long production cycle, great environmental hazards, and high synthesis temperature, and achieve the effects of reduced production costs, simple and economical preparation process, and high activity

Active Publication Date: 2016-02-17
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Application Information

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Problems solved by technology

However, the synthesis temperature of calcium aluminate cement prepared by the traditional sintering method and electrofusion method is too high, the production cycle is long, the energy consumption is large, and the environmental hazards are great. Therefore, in response to the national low-carbon environmental protection policy, in order to obtain high-performance cement Calcium aluminate cement, the development of new calcium aluminate preparation technology is the key to better application of this type of binder in metallurgy, building materials and other fields

Method used

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  • Calcium aluminate cement preparing method
  • Calcium aluminate cement preparing method
  • Calcium aluminate cement preparing method

Examples

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Embodiment 1

[0033] The present embodiment adopts calcium carbonate (purity ≥ 99.0%), aluminum powder (purity ≥ 99.0%) and aluminum oxide (purity ≥ 99.0%) as raw materials, by mass percentage, calcium carbonate (purity ≥ 99.0%) is 18%, Aluminum powder (purity ≥ 99.0%) is 40%, alumina (purity ≥ 99.0%) is 42%; put the uniformly mixed raw materials into a mold, and then dry press them to form a diameter of 20mm and a height of 15mm , a cylindrical sample with a relative density of 50%; after the molding is completed, the sample is demolded, and then placed in a self-propagating high-temperature reaction furnace, and a C-Ti igniter is placed on the sample to conduct a self-propagating high-temperature synthesis reaction Initiated by the heat generated by the Ti-C reaction placed on the top of the sample, while the Ti and C reactions are initiated by a tungsten wire;

[0034] The reaction chamber is filled with argon gas, the pressure is 0.1MPa, and the sample is ignited to undergo a self-propa...

Embodiment 2

[0037] The difference between this embodiment and Example 1 is: by mass percentage, calcium carbonate (purity ≥ 99.0%) is 28%, aluminum powder (purity ≥ 99.0%) is 38%, aluminum oxide (purity ≥ 99.0%) is 34% %;

[0038] The calcium aluminate cement prepared in embodiment 2 has been carried out X-ray diffraction to obtain XRD collection of patterns see image 3 ,Depend on image 3 It can be seen that the calcium aluminate cement prepared in Example 2 contains calcium aluminate (CaAl 2 o 4 , abbreviated as CA), calcium dialuminate (CaAl 4 o 7 , abbreviated as CA 2 ) and dodecacalcium heptaaluminate (Ca 12 Al 14 o 33 , abbreviated as C 12 A 7 ) powder, by mass percentage, calcium monoaluminate accounts for 68% to 72%, calcium dialuminate accounts for 10% to 15%, and the balance is dodecaaluminate heptaaluminate and trace impurities.

Embodiment 3

[0040] The difference between this embodiment and Example 1 is: by mass percentage, calcium carbonate (purity ≥ 99.0%) is 34%, aluminum powder (purity ≥ 99.0%) is 23%, aluminum oxide (purity ≥ 99.0%) is 43% %;

[0041] The calcium aluminate cement prepared in embodiment 3 has been carried out X-ray diffraction to obtain XRD collection of patterns see Figure 4 ,Depend on Figure 4 It can be seen that the calcium aluminate cement prepared in Example 1 contains calcium monoaluminate (CaAl 2 o 4 , abbreviated as CA), calcium dialuminate (CaAl 4 o 7 , abbreviated as CA 2 ) and dodecacalcium heptaaluminate (Ca 12 Al 14 o 33 , abbreviated as C 12 A 7 ) powder, by mass percentage, calcium monoaluminate accounts for 67% to 75%, calcium dialuminate accounts for 5% to 9%, and the balance is dodecacalcium heptaaluminate and trace impurities.

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Abstract

The invention discloses a calcium aluminate cement preparing method. According to the method, raw materials including calcium carbonate, aluminum oxide and aluminite powder are dosed firstly; the weighed raw materials are mixed; the evenly mixed raw materials are formed; the formed materials are placed in a self-propagating high-temperature furnace for reaction; a sample is taken out after temperature is reduced to be indoor temperature, and the sample is ground to generate calcium aluminate cement. The calcium aluminate cement prepared with the method contains 68-74% of CaO.Al2O3, 18-25% of CaO.2Al2O3, and the balance 12CaO.7Al2O3 and trace impurities. The phase composition of the calcium aluminate cement prepared with the method is similar to that of current calcium aluminate cement. The calcium aluminate cement prepared with the method has the advantages that the technology is simple, energy consumption is low and cost is low and can be widely applied to multiple industries including metallurgy and building materials.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, in particular to a preparation method of calcium aluminate cement. technical background [0002] With the development of unshaped refractory materials, refractory castables continue to become its leading product. In many countries, refractory castables account for more than 50% of the total output of refractory materials. Among them, refractory castables combined with calcium aluminate cement It is the largest and most widely used unshaped refractory material. At present, the methods for preparing calcium aluminate cement include traditional sintering method and electrofusion method. However, the synthesis temperature of calcium aluminate cement prepared by the traditional sintering method and electrofusion method is too high, the production cycle is long, the energy consumption is large, and the environmental hazards are great. Therefore, in response to the national low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/32
Inventor 肖国庆刘科燕郜剑英丁冬海
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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