Method for coating titanium dioxide
The technology of titanium dioxide and titanium dioxide slurry is applied in the field of chemistry, which can solve the problems of long production time period of industrial sodium metaaluminate, affecting industrial application and production, environmental pollution, etc., so as to reduce the waste of energy and manpower, and shorten the preparation time. , the effect of reducing costs
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example 1
[0051] a, preparing sodium metaaluminate. Add 500mL of pure water (such as distilled water or deionized water) into the three-necked flask, add 270g of solid sodium hydroxide, and the temperature of the system is heated to 95°C due to the exothermic dissolution; add 420g of aluminum hydroxide under the condition of sufficient stirring, After the addition, the temperature of the system was 70°C; the heating system was heated to boiling, and when the system gradually became clear from turbidity, the system was kept boiling for 30 minutes, then removed and cooled to 40°C to obtain sodium metaaluminate.
[0052] b. Dilute the titanium dioxide slurry so that the TiO in the slurry 2 The concentration is 280g / L, the pH value is 9.0, and the temperature is raised to 40°C;
[0053] c, add zirconium sulfate, the concentration of zirconium sulfate is ZrO 2 Calculated as 100g / L, the amount of zirconium sulfate is calculated as ZrO 2 Calculated as TiO in titanium dioxide slurry 2 0.4% ...
example 2
[0060] a, preparing sodium metaaluminate. Add 100mL of pure water into a three-necked flask, add 180mL of liquid caustic soda with a concentration of 48% by mass, dilute the exotherm to heat the system temperature to 60°C; add 200g of aluminum hydroxide under the condition of full stirring, and add The temperature of the complete system is 50°C; heat the system up to boiling, and when the system gradually becomes clear from turbidity, keep the system boiling for 30 minutes, take it out and cool it to 60°C to obtain sodium metaaluminate.
[0061] b. Dilute the titanium dioxide slurry so that the TiO in the slurry 2 The concentration is 300g / L, the pH value is 10.0, and the temperature is raised to 60°C.
[0062] c, add zirconium sulfate, the concentration of zirconium sulfate is ZrO 2 Calculated as 130g / L, the amount of zirconium sulfate is calculated as ZrO 2 Calculated as TiO in titanium dioxide slurry 2 0.6% by mass, the addition time is 60min, the pH value of the slurry...
example 3
[0069] a, preparing sodium metaaluminate. Add 100mL of pure water into a three-necked flask, add 180mL of liquid caustic soda with a concentration of 48% by mass, dilute and exotherm to heat the system temperature to 60°C; add 180g of aluminum hydroxide under the condition of full stirring, and add The temperature of the complete system is 50°C; heat the system up to boiling, and when the system gradually changes from cloudy to clear, keep the system boiling for 20 minutes, take it out and cool it to 70°C to obtain sodium metaaluminate.
[0070] b. Add a sodium hydroxide solution with a concentration of 10% by mass to the titanium dioxide slurry to adjust the pH value of the slurry to 9.0, and the adding time of the sodium hydroxide solution is 5 minutes.
[0071] c, add sodium silicate to the slurry, the concentration of sodium silicate is SiO 2 Calculated as 190g / L, the amount added is SiO 2 Calculated as TiO in titanium dioxide slurry 2 The mass is 1.0%, and the addition...
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