Patent · US Expired

Process for the production of titanium dioxide pigments

US4902485A · kind A · utility

3Cited by

5References

7Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Eckhard Bayer · Krefeld, DE
Gunter Lailach · Krefeld, DE

Key dates

Filing date	Nov 23, 1988
Grant date	Feb 20, 1990
Priority date	—
Expiry date	Nov 23, 2008

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/129
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A process for the production of TiO.sub.2 pigments by the sulfate process by digestion of titanium-containing raw materials with sulfuric acid, hydrolysis of the titanyl sulfate formed, purification of the hydrolyzate and calcination of the hydrolyzate in rotary kilns, wherein the calcination conditions are regulated through adjustment of the SO.sub.2 content of the waste gases issuing from the rotary kilns used for calcination.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.