Method utilizing calcium carbide slag as raw material to produce gypsum crystal whisker
A technology of gypsum whiskers and carbide slag, which is applied in the field of comprehensive utilization of solid waste, can solve the problems of complex reaction steps, high production cost, and long production cycle, and achieve the effect of cheap raw materials, low cost, and large operating flexibility
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[0044] Example 1:
[0045] A method for producing gypsum whiskers using calcium carbide slag as a raw material, which includes the following steps:
[0046] (1) Dry the calcium carbide slag at 120°C for 3 hours, then ball mill for 10 minutes, and then calcinate at 900°C for 1 hour;
[0047] (2) Mix the calcined calcium carbide slag and dilute sulfuric acid (50% sulfuric acid mass fraction) in a ratio of 1:3 by volume, stir evenly, and then react for 5 hours at 80°C in a water bath. During the reaction Magnetic stirring at a stirring speed of 1000 rpm; the product after the reaction was washed with water to a pH value of 7, and then centrifuged (2000 rpm, 30 minutes) to obtain a solid product;
[0048] (3) The solid obtained in step (2) above is slurried with water, the slurry concentration is controlled to 1% (mass ratio), ethylene glycol is added (the mass is 0.5% of the solids in the slurry), and then transferred to hydrothermal Hydrothermal reaction at 110°C in the reaction kettle fo
Example Embodiment
[0050] Example 2:
[0051] A method for producing gypsum whiskers using calcium carbide slag as a raw material, which includes the following steps:
[0052] (1) Dry the calcium carbide slag at 70°C for 10 hours, then ball mill for 15 minutes, and then calcinate at 500°C for 5 hours;
[0053] (2) Mix the calcined calcium carbide slag and dilute sulfuric acid (25% sulfuric acid mass fraction) in a ratio of 1:5 by volume, stir evenly, and then react for 30 hours at 30°C in a water bath. During the reaction Magnetic stirring, the stirring speed is 200 rpm; the product after the reaction is washed with water until the pH value is equal to 7, and then centrifuged (4000 rpm, 5 minutes), dried (60 ℃, 12 hours);
[0054] (3) The solid obtained in step (2) above is slurried with water, the slurry concentration is controlled to 10% (mass ratio), ethylene glycol is added (the mass is 3% of the solids in the slurry), and then transferred to hydrothermal Hydrothermal reaction at 180℃ in the reactor f
Example Embodiment
[0056] Example 3:
[0057] A method for producing gypsum whiskers using calcium carbide slag as a raw material, which includes the following steps:
[0058] (1) Dry the calcium carbide slag at 80°C for 5 hours, then ball mill for 5 minutes, and then calcinate at 700°C for 3 hours;
[0059] (2) Mix the calcined calcium carbide slag and dilute sulfuric acid (35% sulfuric acid mass fraction) in a ratio of 1:1 by volume, stir evenly, and then react for 10 hours at a water bath temperature of 50°C. During the reaction Magnetic stirring at a stirring speed of 3000 rpm; wash the reaction product with water until the pH value is equal to 7, then centrifuge (3000 rpm, 10 minutes), and dry (120°C, 5 hours);
[0060] (3) The solid obtained in step (2) above is slurried with water, the slurry concentration is controlled to 5% (mass ratio), ethylene glycol is added (the mass is 1% of the solids in the slurry), and then transferred to hydrothermal Hydrothermal reaction at 150℃ in the reactor for 5 ho
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