Production method of high-light-fastness rutile type titanium dioxide
A technology of rutile titanium dioxide and production methods, which is applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of insufficient light resistance, little contribution, yellowish phase of titanium dioxide pink, etc., to achieve Effects of improving light resistance, improving dispersibility, and high hiding power
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[0034] Example 1
[0035] The preparation method of the high light resistance titanium dioxide of this embodiment includes the following main steps:
[0036] (1) Prepare a slurry containing primary titanium dioxide: Weigh 6000g deionized water and add 12g SiO 2 Solution of sodium silicate, add 6000g uncoated rutile titanium dioxide under stirring to make a concentration of about 800gTiO 2 / L of titanium dioxide slurry, and then sand with a sand mill to make the titanium dioxide reach the primary particle size;
[0037] (2) Use deionized water to dilute the concentration of the sand-milled titanium dioxide slurry to 300gTiO 2 / L, and then transferred to the coating tank, the temperature of the slurry is raised to 50℃ by indirect heating with steam;
[0038] (3) Add 150mL40gP 2 O 5 / L (P after adding 2 O 5 With TiO 2 The mass percentage is about 0.1%) sodium hexametaphosphate solution; then the pH value of the slurry is adjusted to 8.0 with a dilute sulfuric acid solution with a mass per...
Example Embodiment
[0043] Example 2
[0044] The preparation method of the high light resistance titanium dioxide of this embodiment includes the following main steps:
[0045] (1) Prepare a slurry containing primary titanium dioxide: Weigh 6000g deionized water and add 12g SiO 2 Solution of sodium silicate, add 6000g uncoated rutile titanium dioxide under stirring to make a concentration of about 800gTiO 2 / L of titanium dioxide slurry, and then sand with a sand mill to make the titanium dioxide reach the primary particle size;
[0046] (2) Use deionized water to dilute the sand-milled titanium dioxide slurry concentration to 200gTiO 2 / L, and then transferred to the coating tank, the temperature of the slurry is raised to 40℃ by indirect heating with steam;
[0047] (3) Add 1200mL40gP 2 O 5 / L (P after adding 2 O 5 With TiO 2 The mass percentage is about 0.8%) sodium hexametaphosphate solution; then the pH value of the slurry is adjusted to 7.0 with a dilute sulfuric acid solution with a mass percenta...
Example Embodiment
[0052] Example 3
[0053] The preparation method of the high light resistance titanium dioxide of this embodiment includes the following main steps:
[0054] (1) Prepare a slurry containing primary titanium dioxide: Weigh 6000g deionized water and add 12g SiO 2 Add 6000g of uncoated rutile titanium dioxide under stirring to make the concentration of about 800gTiO 2 / L of titanium dioxide slurry, and then sand with a sand mill to make the titanium dioxide reach the primary particle size;
[0055] (2) Use deionized water to dilute the sand-milled titanium dioxide slurry concentration to 400gTiO 2 / L, and then transferred to the coating tank, the temperature of the slurry is raised to 70℃ by indirect heating with steam;
[0056] (3) Add 3000mL30gP 2 O 5 / L (P after adding 2 O 5 With TiO 2 The mass percentage is about 1.5%) phosphoric acid solution; then the pH value of the slurry is adjusted to 7.5 with a dilute sulfuric acid solution with a mass percentage concentration of 15%;
[0057] ...
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