Patent · US Expired

Treating hydrolysis residues from preparation of titanium dioxide

US4321237A · kind A · utility

2Cited by

3References

6Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Peter Panek · Castlecomer, IE
Peter Woditsch · Krefeld, DE
Werner Kannchen · Duisburg, DE

Key dates

Filing date	Dec 5, 1980
Grant date	Mar 23, 1982
Priority date	—
Expiry date	Dec 5, 2000

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P10/20
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

In the process wherein a titanium-containing material is subjected to react with sulphuric acid to form a solid reaction mass from which the titanium values are recovered in solution by digestion with water or dilute sulphuric acid leaving behind a reaction residue and the reaction residue is thereafter treated to recover at least part of the titanium contained therein, the improvement wherein the treatment of the reaction residue is effected by contacting with sulphuric acid of a concentration greater than 86% a mixture by weight comprising about 5 to 95% of the reaction residue and 95 to 5% of a slag having a TiO.sub.2 content 60% by weight and a Ti(III) content of about 5 to 40% by weight, and thereafter eventually adding water, steam or dilute sulphuric acid to the mass to start the reaction.

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