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Method for preparing slurry titanium dioxide by hydrothermal method

A technology of titanium dioxide and hydrothermal method, applied in chemical instruments and methods, titanium dioxide, fibrous fillers, etc., can solve the problems of low extraction rate, reduced weather resistance of titanium dioxide slurry, etc. The effect of weather resistance, high storage time

Inactive Publication Date: 2020-04-17
LOMON BILLIONS GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of three-washing filter cake to prepare slurry titanium dioxide makes the removal rate of bound water on the surface of titanium dioxide lower than that of titanium dioxide powder, and the surface of titanium dioxide particles in the water system environment is easy to adsorb more surface hydroxyl groups, which leads to the later application system. The weather resistance of slurry titanium dioxide is greatly reduced

Method used

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  • Method for preparing slurry titanium dioxide by hydrothermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Select the chlorination method base material with a particle size D50 of 0.285 μm and a particle size distribution of 1.48 to make a 300 g / L slurry, raise the temperature to 90 ° C, adjust the pH to 10.5 with sodium hydroxide solution; add 3.5 wt % silicate solution (as SiO 2 meter), the addition time is 15min; the pH of the slurry is adjusted to 5 with dilute sulfuric acid, and the adjustment time is 100min; the hydrothermal reaction is carried out at a temperature of 150°C, and the reaction time is 3h; the temperature is lowered to 60-70°C, and 2.4wt% chloride is added Aluminum solution (as Al 2 o 3 meter), add sodium hydroxide solution at the same time, keep the slurry pH as 7.5, add time 60min, homogenize 30min; Wash the slurry through a 325-mesh sieve until the conductivity of the filter cake is 70-100 μs / cm, and the solid content of the filter cake is >65%; perform beating and dispersion, add 1.0 wt% polycarboxylate sodium salt dispersant, and the solid content ...

Embodiment 2

[0031] Select a sulfuric acid base material with a particle size D50 of 0.325 μm and a particle size distribution of 1.47 to make a 4S0g / L slurry, raise the temperature to 85°C, adjust the pH to 9 with sodium hydroxide solution; add 3.0wt% silicate solution (as SiO 2 meter), the addition time is 25min; the pH of the slurry is adjusted to 6.5 with dilute sulfuric acid, and the adjustment time is 80min; the hydrothermal reaction is carried out at a temperature of 175°C, and the reaction time is 6h; the temperature is lowered to 60-70°C, and 1.0wt% aluminum sulfate is added solution (as Al 2 o 3 meter), add dilute sodium hydroxide solution at the same time, keep the slurry pH as 6, add time 40min, homogenize 30min; adjust pH to 7 with sodium hydroxide solution, carry out hydrothermal reaction at temperature 150 ℃, reaction time is 6h; wash the slurry through a 325-mesh sieve until the conductivity of the filter cake is 70-100 μs / cm, and the solid content of the filter cake is >...

Embodiment 3

[0033] Select the chlorination method base material with a particle size D50 of 0.370 μm and a particle size distribution of 1.44 to make a 350g / L slurry, raise the temperature to 70°C, adjust the pH to 10 with sodium hydroxide solution; add 2.6wt% silicate solution (as SiO 2 meter), the addition time is 30min; the pH of the slurry is adjusted to 8 with dilute sulfuric acid, and the adjustment time is 160min; the hydrothermal reaction is carried out at a temperature of 180°C, and the reaction time is 2h; the temperature is lowered to 60-70°C, and 4.8wt% aluminum metabolite is added Sodium acid solution (as Al 2 o 3 meter), add dilute sulfuric acid solution at the same time, keep the slurry pH as 9, add time 130min, homogenize 30min; The slurry is washed through a 325-mesh sieve until the conductivity of the filter cake is 70-100 μs / cm, and the solid content of the filter cake is > 65%; beating and dispersing is performed, and 3.0 wt% polycarboxylate sodium salt dispersant is...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/04C09C3/06C01G23/047
CPCC01G23/08C01P2006/22C09C1/3623C09C1/3661C09C1/3692
Inventor 陈建立李瑞瑞王永珊冯亚阳赵丁曹青喜
Owner LOMON BILLIONS GRP CO LTD
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