Preparation method of aluminum hydroxide for artificial marble
A technology of artificial marble and aluminum hydroxide, which is applied in the field of preparation of aluminum hydroxide for artificial marble, can solve the problems of low whiteness of plates, unstable aluminum hydroxide raw material index, fluctuation of color difference, etc., achieve high whiteness, and the preparation method Simple and reasonable, stable color effect
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Embodiment 1
[0010] Raw material preparation: add milk of lime with a weight concentration of 20% to the sodium aluminate solution with an alumina concentration of 120g / L, purify and filter through deep desiliconization, control the b value to 1.4, and cool it down to 56 ℃, the decomposition time is controlled at 50 hours, and the coarse powder with D50 of aluminum hydroxide at 75um is obtained; part of the coarse powder is used as coarse particles after drying, and part is sent to a mechanical mill to make fine particles with D50 at 12μm.
[0011] The above two kinds of coarse and fine granular materials are mixed uniformly by a horizontal ribbon mixer according to the particle size ratio of 6:1 and the weight ratio of 1.5:1 to obtain high whiteness, b value of 0.4, and oil absorption value of 17mg / 100ml. Aluminum hydroxide filler for artificial marble made of sesame oil.
Embodiment 2
[0013] Raw material preparation: add lime milk to the sodium aluminate solution with an alumina concentration of 120g / L for deep desiliconization and purification, control the b value to 1.45, cool down to 58°C through a plate heat exchanger, and control the decomposition time to 55 hours. The coarse powder with D50 of aluminum hydroxide at 80 μm is obtained; part of the coarse powder is used as coarse particles after drying, and part is sent to mechanical milling to make fine particles with D50 at 13 μm.
[0014] Mix the above two kinds of coarse and fine granular materials according to the particle size ratio of 7:1 and the weight ratio of 3:1, and mix them evenly through a horizontal ribbon mixer to obtain high whiteness, b value of 0.35, and oil absorption value of 16.5mg / 100ml Castor oil aluminum hydroxide filler for artificial marble.
Embodiment 3
[0016] In the preparation method of aluminum hydroxide for artificial marble of the present invention, milk of lime is added to the sodium aluminate solution, and after conventional desiliconization and purification, the sodium aluminate solution with a b value of 1.35 is obtained through leaf filter separation, and controlled αk is 1.47, and the temperature is controlled at 60°C. Decompose the sodium aluminate solution to obtain coarse aluminum hydroxide particles with a D50 of 100 μm; grind the coarse aluminum hydroxide to obtain fine aluminum hydroxide particles with a D50 of 15 μm; separate the coarse and fine particles according to their particle size The ratio of 6.5:1 and the weight ratio of 1.8:1 are evenly mixed to obtain the aluminum hydroxide used as artificial marble filler in the present invention.
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