High-carbonization-activity wollastonite as well as preparation method and application thereof
A technology of wollastonite and high carbonization, which is applied in the direction of chemical instruments and methods, carbon compounds, silicates, etc., can solve the problem of low carbonization activity of natural wollastonite, achieve the improvement of compressive strength, simple preparation method, and carbonization The effect of improving the reactivity
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[0028] Aiming at the problem of low carbonization reaction activity existing in natural wollastonite, the present invention provides a preparation method of high carbonization active wollastonite, comprising the following steps: (1) calcining raw meal containing wollastonite minerals; (2) After the calcination is completed, it is cooled to room temperature at a rate of 500° C. / min or more.
[0029] In a preferred embodiment of the present invention, the calcination temperature is 1150-1300°C (for example, 1150°C, 1200°C, 1250°C or 1300°C), and the calcination time is 1-2h (for example, 1h, 1.2h, 1.4h, 1.6h). , 1.8h or 2h).
[0030] In a preferred embodiment of the present invention, the raw meal also contains anhydrous sodium carbonate.
[0031] In a preferred embodiment of the present invention, before step (1), the raw meal is crushed to a particle size of 5 mm or less, and the step of tableting is performed.
[0032] In a preferred embodiment of the present invention, in ...
Embodiment 1
[0046] The preparation method of the high carbonized active wollastonite of the present embodiment comprises the following steps:
[0047] (1) crushing and grinding the wollastonite mineral particles (particle size < 5mm), and pressing them into tablets to obtain green tablets;
[0048] (2) will be calcined (carried out in cement rotary kiln) at 1300 DEG C with the raw material sheet obtained in step (1), and be kept warm for 2 hours;
[0049] (3) rapidly cooling the clinker fired in step (2) (cooling rate>500°C / min) to obtain the high-carbide active wollastonite sample of the present embodiment;
[0050](4) The high carbonized active wollastonite sample prepared in step (3) is ground finely (particle size ≤ 75 μm) and mixed with 10% water of the wollastonite sample mass, and is subjected to a pressure of 4 MPa to form a test piece with a size of 2*2*2cm. The blocks were carbonized in a closed reactor. Carbonization conditions are: CO 2 The air pressure is 0.3MPa; the tempe...
Embodiment 2
[0058] The preparation method of the high carbonized active wollastonite of the present embodiment comprises the following steps:
[0059] (1) The wollastonite mineral particles are crushed and ground (particle size 2 CO 3 ), and pressed under 10MPa molding pressure to obtain green sheet;
[0060] (2) calcining the obtained green sheet in step (1) at 1250 ° C (carrying out in a cement rotary kiln), keeping the temperature for 2 hours;
[0061] (3) rapidly cooling the clinker fired in step (2) (cooling rate>500°C / min) to obtain the high-carbide active wollastonite sample of the present embodiment;
[0062] (4) The highly carbonized active wollastonite sample prepared in step (3) is ground (particle size ≤ 75 μm) and mixed with 10% water of the wollastonite sample mass, pressure-molded at 4 MPa, and carbonized in a closed reaction kettle . Carbonization conditions are: CO 2 The air pressure is 0.3MPa; the temperature of the reaction kettle is room temperature, and the carbon...
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