Heavy-coated titanium dioxide and preparation method thereof

CN121449104APending Publication Date: 2026-02-03LOMON BILLIONS GRP CO LTD
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Patent Information

Application Number
CN202511705347.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-19
Publication Date
2026-02-03

AI Technical Summary

Technical Problem

Traditional titanium dioxide is insufficient in terms of whiteness, brightness and weather resistance, making it difficult to meet the needs of high-end manufacturing industries. In addition, the heavy coating process results in excessively high initial pulp viscosity, making processing difficult.

Method used

A method for preparing titanium dioxide with heavy coating is adopted, which involves depositing aluminum phosphate and aluminum salts on the surface of titanium dioxide to form a thick coating layer, controlling the pH of the final slurry at 10.0-12.0, and using metal hydrides and lithium reagents to generate oxygen anions to optimize the density and stability of the coating layer.

Benefits of technology

It significantly improves the whiteness, brightness, and lightfastness of titanium dioxide, reduces the initial pulp viscosity, and improves processing performance.

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Abstract

The invention relates to the technical field of titanium dioxide production, in particular to heavy-coated titanium dioxide and a preparation method thereof. The preparation method comprises the following steps: S1, adjusting the temperature and pH of titanium dioxide base material slurry, and curing; s2, adding a phosphorus source, controlling the pH value of the slurry to be 2.0-5.5, and curing; the addition amount of the phosphorus source accounts for 6%-8% of the mass of TiO2 in the slurry in terms of P2O5; s3, adding first aluminum salt, and curing; s4, adding a second aluminum salt and a pH regulator at the same time, and curing; the total adding amount of the first aluminum salt and the second aluminum salt accounts for 15-19% of the mass of TiO2 in the slurry in terms of Al2O3; and S5, adjusting the pH value of the slurry to 10.0-12.0, curing, washing with water, flashing and pulverizing to obtain the heavy-coated titanium dioxide. Through inorganic heavy coating, the whiteness, the brightness and the weather resistance of the titanium dioxide are remarkably improved, and the problem of high initial pulping viscosity of the heavy-coated titanium dioxide is solved by controlling the pH value of end-point slurry.
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