Ultrafine rutile type titanium dioxide pigment special for color master and preparation method thereof
A titanium dioxide and rutile-type technology, applied in chemical instruments and methods, inorganic pigment treatment, dyeing organosilicon compound treatment, etc., can solve problems such as volatile matter, dispersibility, processability, high temperature yellowing resistance, etc., and achieve high-speed The effect of growing market space, eliminating technical defects, and excellent concentration of particle size distribution
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[0023] The invention discloses a method for preparing rutile titanium dioxide pigment with high filling, high dispersion, high covering and concentrated particle size distribution. First use aluminum salt to improve the crystal structure to prepare an intermediate product, which is used as raw material, and then wet coating process is used to coat an appropriate amount of silicon aluminum film and corresponding organic film on the surface of primary particles of titanium dioxide. The specific technological process is: the special titanium dioxide TiO of rutile type color masterbatch of the present invention 2 Based on a sulfuric acid production process, it is first prepared by special aluminum-based salt treatment, and the 325-mesh sieve of the particles is required to be no more than 1%. The pH value of the slurry is adjusted by adding silicate or corresponding weak alkali salt. , to obtain a rutile base material without surface treatment, which has better resistance to chalk...
Embodiment 1
[0030] Take the filter cake treated with aluminum series salt, and obtain 800 grams of kiln bottoms with a rutile conversion rate of 99.5% by calcining, and process the calcined bottoms through intermediate crushing and wet sand milling to improve the uniformity of particle distribution, Use deionized water to adjust the concentration of the dispersed slurry obtained to 280g / L TiO 2 , the pH value of the slurry is adjusted to 10, and the 325 mesh sieve of the particles is required to be no more than 1%, and the pH value of the slurry is adjusted by adding silicate or corresponding weak alkali salt. Next, put the above slurry into the coating tank and heat it to 90°C, and within 10 minutes, use a sufficient amount of alkali or acid dilute solution, such as sodium hydroxide or sulfuric acid solution, to adjust the pH value of the slurry to not lower than 10. Mix for another 30 minutes to disperse evenly. Add a sufficient amount of aluminum salt solution. The aluminum salt used ...
Embodiment 2
[0033] Take the filter cake treated with aluminum sulfate, lithium carbonate or magnesium sulfate, and phosphate, and obtain 2000 grams of kiln bottoms with a rutile conversion rate of 98.5% by calcining. Improve the particle distribution uniformity of the calcined kiln by intermediate crushing and wet sand grinding, and adjust the concentration of the dispersed slurry to 300g / L TiO2 with deionized water. 2 , the pH value of the slurry was adjusted to 11. Next, add the above slurry into the coating tank and heat to 60°C, and use enough sodium hydroxide or sulfuric acid solution within 10 minutes to adjust the pH value of the slurry to not less than 10, and mix for another 30 minutes. Add a sufficient amount of aluminum salt solution to the slurry, and the amount of addition is controlled as Al 2 o 3 : TiO 2 =0.5%, in this process, use sulfuric acid or sodium hydroxide solution to maintain the pH value at about 9, and ripen for 30 minutes after the addition is completed. Th...
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