Spherical quartz sand with core-shell structure and preparation method thereof
A technology of core-shell structure and spherical shape, which is applied to casting molding equipment, molds, cores, etc., can solve the problems of high thermal conductivity of quartz sand, low thermal shock stability, and single structure, and achieve low price and high sphericity , The effect of simple process
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Embodiment 1
[0035] A spherical quartz molding sand with a core-shell structure and a preparation method thereof. The concrete steps of described preparation method are:
[0036] The first step, according to the mass ratio of silica: silicon carbide: limestone is 100: (10 ~ 12): (6 ~ 8), silica, silicon carbide and limestone are added in the ball mill, ball milled to a particle size of ≤ 100 μm, obtained after ball milling Mix powder.
[0037] In the second step, the mixed powder after ball milling is placed in a muffle furnace for calcination, the calcination temperature is 900-960° C., and the calcination time is 0.5-1 hour to obtain the calcined mixed powder.
[0038] Step 3: adding water accounting for 30-40 wt% of the calcined mixed powder to the calcined mixed powder, and wet grinding in a ball mill until the particle size is ≤60 μm, to obtain a wet-milled mixed slurry.
[0039] In the fourth step, the wet-milled mixed slurry is put into a spray dryer, and dried at 150-200° C. for ...
Embodiment 2
[0044] A spherical quartz molding sand with a core-shell structure and a preparation method thereof. The concrete steps of described preparation method are:
[0045] The first step, according to the mass ratio of silica: silicon carbide: limestone is 100: (11 ~ 13): (6 ~ 8), silica, silicon carbide and limestone are added in the ball mill, ball milled to a particle size of ≤ 100 μm, obtained after ball milling Mix powder.
[0046] In the second step, the mixed powder after ball milling is placed in a muffle furnace for calcination, the calcination temperature is 900-960° C., and the calcination time is 0.5-1 hour to obtain the calcined mixed powder.
[0047] Step 3: adding water accounting for 30-40 wt% of the calcined mixed powder to the calcined mixed powder, and wet grinding in a ball mill until the particle size is ≤60 μm, to obtain a wet-milled mixed slurry.
[0048] In the fourth step, the wet-milled mixed slurry is put into a spray dryer, and dried at 150-200° C. for ...
Embodiment 3
[0053] A spherical quartz molding sand with a core-shell structure and a preparation method thereof. The concrete steps of described preparation method are:
[0054] The first step, according to the mass ratio of silica: silicon carbide: limestone is 100: (12 ~ 14): (7 ~ 9), silica, silicon carbide and limestone are added in the ball mill, ball milled to a particle size of ≤ 100 μm, obtained after ball milling Mix powder.
[0055] In the second step, the mixed powder after ball milling is placed in a muffle furnace for calcination, the calcination temperature is 940-1000° C., and the calcination time is 0.5-1 hour to obtain the calcined mixed powder.
[0056] Step 3: adding water accounting for 30-40 wt% of the calcined mixed powder to the calcined mixed powder, and wet grinding in a ball mill until the particle size is ≤60 μm, to obtain a wet-milled mixed slurry.
[0057] In the fourth step, the wet-milled mixed slurry is put into a spray dryer, and dried at 150-200° C. for...
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