Method for preparing slurry titanium dioxide by hydrothermal method

Abstract

The invention belongs to the technical field of slurry titanium dioxide preparation, and discloses a method for preparing slurry titanium dioxide by a hydrothermal method, which comprises the following steps: preparing a titanium dioxide base material into 300-450g / L slurry, and regulating the temperature of the slurry to 70-90 DEG C and the pH value to 9-10.5; adding a silicate solution into theslurry, and adjusting the pH value of the slurry to 5-8; performing a hydrothermal reaction on the slurry at 150-180 DEG C at the reaction time for 2-6 h; cooling the reacted slurry to 60-70 DEG C, adding an aluminum salt solution and an inorganic acid or inorganic alkali solution into the slurry at the same time, keeping the pH of the slurry constant at 6-9, and homogenizing for 30 minutes; adjusting the pH value of the slurry to 6-8, and carrying out a hydrothermal reaction at 150-200 DEG C for 4-6 h; sieving and washing the slurry to obtain a filter cake; pulping and dispersing, and sandingand sieving the slurry to obtain slurry titanium dioxide. The slurry titanium dioxide has high weather resistance and high dispersion stability and is environmentally friendly, and the method is freeof dust.

Description

technical field

[0001] The invention belongs to the technical field of slurry titanium dioxide preparation, and in particular relates to a method for preparing slurry titanium dioxide by a hydrothermal method. Background technique

[0002] Titanium dioxide is an inorganic pigment with the highest refractive index. Because of its high refractive index, it exhibits high whiteness. As an inorganic white pigment, it is widely used in coatings, papermaking, plastics, inks, chemical fibers, rubber and other fields. During the use of manufacturers and downstream customers, due to the small particle size of titanium dioxide, it will cause a certain degree of dust, which will bring inconvenience to the operator and cause health problems for front-line workers. At the same time, the environmental problems caused by dust will limit the use of titanium dioxide to a certain extent. Production and use, titanium dioxide manufacturers have to increase investment in dust control, resulting i...

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