Preparation method of hollow glass microbead
A technology of hollow glass microspheres and sol, applied in glass manufacturing equipment, glass molding, manufacturing tools, etc., can solve the risk of product quality stability, high alkalinity of hollow glass microspheres, difficulty in controlling particle size distribution, etc. problem, to achieve the effect of simple ingredients and ingredients, low density, and reduced alkalinity
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Embodiment 1
[0039] To prepare sodium silicate solution, add 110kg of water at 20°C to 25°C to 36.70kg of powdered NaOH to prepare liquid alkali with a mass fraction of 25%, and send the alkali liquid into the batching tank; put 71.56kg of quartz sand The powder is put into the batching tank under the condition of continuous stirring; then the solution in the batching tank is sent to 115kg of water in the first reaction kettle, and the material is continuously stirred, and it is fully reacted at 80°C to 100°C to prepare a 333kg sodium silicate solution Transfer to the sodium silicate solution storage tank;
[0040] To prepare calcium silicate hydrate, put 0.25kg of calcium oxide and 0.25kg of quartz sand powder into 2.5kg of water in the second reaction kettle to make a slurry, and heat the second reaction kettle to 120°C to 130°C ℃, the slurry is driven by the stirring blade to rotate and flow, generating a strong eddy current, and the motion state is a turbulent state; the eddy current i...
Embodiment 2
[0047] The basic steps are the same as in Example 1, and the differences from Example 1 are:
[0048] 71.56kg of quartz sand powder, 36.70kg of sodium hydroxide, and 225kg of water were prepared to make 333kg of sodium silicate solution; 0.5kg of calcium oxide, 0.5kg of quartz sand powder, and 5kg of water were prepared to make 6kg of calcium silicate solution; 1.4kg of calcium oxide and 8.6 boric acid kg and 28kg of water to prepare 38kg of calcium borate solution; add 150kg of water after mixing the three; spray drying hot air temperature 600°C, air outlet 130°C; high temperature strengthening furnace hot air temperature 400°C, air outlet 120°C. The hollow glass microspheres made have a true density of 0.6g / cm 3 , the compressive strength (80% survival content) is 43MPa, the particle size distribution is 5-120um, and the ball forming rate is greater than 85%.
Embodiment 3
[0050] The basic steps are the same as in Example 1, and the differences from Example 1 are:
[0051] 71.56kg of quartz sand powder, 36.70kg of sodium hydroxide, and 225kg of water are prepared into 333kg of sodium silicate solution; 0.375kg of calcium oxide, 0.375kg of quartz sand powder, and 3.75kg of water are prepared into 4.5kg of calcium silicate solution; 1.05kg of calcium oxide, 6.45kg of boric acid and 21kg of water were prepared to make 28.5kg of calcium borate solution; the three were mixed and then 125kg of water was added; the temperature of the spray drying air inlet was 700°C, the air outlet was 140°C; the temperature of the air inlet of the high temperature strengthening furnace was 450°C, and the air outlet 120°C. The hollow glass microspheres made have a true density of 0.5g / cm 3 . The compressive strength (80% survival content) is 28MPa, the particle size distribution is 5-120um, and the pelleting rate is greater than 85%.
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