Method for preparing spherical tetracalcium aluminoferrite solid solution by jointly adopting airflow crushing-radio frequency plasma technology

Abstract

The invention belongs to the field of building material preparation, and particularly relates to a method for preparing a spherical C4AF solid solution by jointly adopting an airflow crushing-radio frequency plasma technology. The preparation method comprises the steps of firstly, mixing a calcium raw material, an aluminum raw material, an iron raw material and an alkali metal component according to the chemical dosage of a C4AF solid solution, and carrying out air jet pulverization in advance to obtain superfine powder; and carrying out plasma high-temperature treatment on the superfine powder through a radio frequency plasma system to obtain a high-activity and spheroidized C4AF solid solution. According to the method for preparing the C4AF solid solution by combining an airflow crushing-radio frequency plasma system provided by the invention, the technical thinking inertia of 'two-grinding and one-burning' preparation of Portland cement or clinker single ore is broken through, only 'one-grinding and one-burning' in the traditional sense is needed, and the method has the obvious low-carbon advantage. The C4AF solid solution prepared by the method has ultrahigh hydration activity and regular spherical morphology, and can be used as a cement concrete additive with ultrahigh strength, high toughness, high wear resistance and high corrosion resistance.

Description

technical field [0001] The invention belongs to the field of building material preparation, in particular to a method for preparing spherical tetracalcium aluminoferrite C 4 AF solid solution method. Background technique [0002] The production process of Portland cement is summed up as "two grindings and one firing". Firstly, calcareous raw materials, silica-alumina clay and iron correction materials are mixed and ground in proportion, and fired in a rotary kiln to obtain silicate clinker. , Finally, the Portland clinker, gypsum, and admixture are ground together again to obtain different types of Portland cement. Whether it is laboratory or industrial production, or even the preparation of a single clinker mineral, this process is also referred to. The production of Portland cement requires high energy consumption and complicated processes. With the deepening of the concept of carbon peaking / carbon neutralization, the cement industry is facing great challenges in energy ...

AI Technical Summary

Problems solved by technology

As a cement additive, it must be easy to produce and have a large amount. However, due to the relatively low melting point of the iron-aluminum phase, it is easy to cause ringing and skinning in the kiln, and it is difficult to prepare in a traditional kiln.

Chinese patent CN102153144A discloses a preparation method of calcium aluminum ferrite, but the process is cumbersome, the cycle is long, and the yield is low; although it can be synthesized at a low temperature of 700 ° C, the hydration activity is significantly lower than the iron phase of the actual clinker active

[0005] From the above analysis, it can be seen that the traditional Portland cement clinker firing mode is difficult to break through the "two grinding and one firing" method. New fuel substitution technology is an important development direction for energy saving and emission reduction in firing measures. is also like this

to C 4 As far as AF solid solution is concerned, there is currently a lack of methods to achieve mass production of highly active C 4 Key technology of AF solid solution

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