Preparation method and application of modified heavy calcium carbonate
A heavy calcium carbonate, modification technology, applied in building components, building insulation materials, buildings, etc., can solve the problems of high cost of asphalt structural modification, complicated construction, etc., and achieve the improvement of softening point, low production cost, and preparation method simple effect
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[0022] First aspect, the present invention provides a kind of preparation method of modified ground calcium carbonate, comprises the following steps:
[0023] (1) the ground calcium carbonate coarse powder is mixed with water to form a heavy calcium carbonate suspension;
[0024] (2) the heavy calcium carbonate suspension prepared in step (1) is ground to obtain a slurry;
[0025] (3) adjusting the pH of the slurry prepared in step (2) to below 7.0, then adding cellulose and acid anhydride additives, and stirring evenly to obtain a modified slurry;
[0026] (4) dehydrating, drying, and pulverizing the modified slurry obtained in step (3) to obtain modified heavy calcium carbonate.
[0027] In the present invention, the grinding in step (2) can be grinding by flake machine, grinding by ball mill or any other grinding method.
[0028] Preferably, the mass ratio of the ground calcium carbonate coarse powder, the cellulose and the acid anhydride additive is 60-1000:3-10:1.
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Embodiment 1
[0040] (1) After 100kg of calcite is mechanically crushed, it is sent to a vertical mill for fine crushing to form a coarse calcium carbonate powder with a particle size of 325 meshes, and then the coarse calcium carbonate powder is mixed with water to form a solid content 50% ground calcium carbonate suspension;
[0041] (2) The heavy calcium carbonate suspension that step (1) is made is transported in the peeling machine and grinds, obtains the slurry that D97 particle diameter is 5.8 μ m;
[0042] (3) in the slurry that step (2) makes, add the phosphoric acid solution that mass concentration is 10%, the pH of slurry is adjusted to 6.4, then add the aqueous solution of hydroxypropyl methylcellulose (HPMC) that 3kg molecular weight is 80000 And 0.3kg isobutyric anhydride, 0.3kg propionic anhydride, obtain modified slurry after stirring for 45min;
[0043] (4) dehydrating, drying and pulverizing the modified slurry obtained in step (3) to obtain modified heavy calcium carbona...
Embodiment 2
[0045] (1) After 100kg of calcite is mechanically crushed, it is sent into a vertical mill for fine crushing to form a heavy calcium carbonate coarse powder with a particle size of 200 meshes, and then the heavy calcium carbonate coarse powder is mixed with water to form a solid content 40% ground calcium carbonate suspension;
[0046](2) The heavy calcium carbonate suspension that step (1) is made is transported in the peeling machine and grinds, obtains the slurry that D97 particle diameter is 5.1 μ m;
[0047] (3) in the slurry that step (2) makes, add the hydrochloric acid solution that mass concentration is 15%, the pH of slurry is adjusted to 6.8, then add 1kg molecular weight and be the aqueous solution of the hydroxyethyl cellulose of 100000 and 0.1kg acetic anhydride , after stirring for 30min, the modified slurry was obtained;
[0048] (4) dehydrating, drying, and pulverizing the modified slurry obtained in step (3) to obtain modified heavy calcium carbonate.
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