Production of purified iron chloride by a vacuum process in the manufacture of titanium dioxide

US5248497A · kind A · utility

Assignee

• Kronos, Inc. · US

Inventors

• Achim Hartmann · Pulheim, DE
• Erwin Schmeir · Engelskirchen, DE

Key dates

• Filing date: Aug 7, 1992
• Grant date: Sep 28, 1993
• Expiry date: Aug 7, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01G49/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

This invention provides a process for the recovery of purified ferrous chloride resulting as a by-product during the production of titanium dioxide by the chloride process. The process involves a two-step cooling of a filtered solution containing ferrous chloride and other material in a manner to crystallize the ferrous chloride as a pure product. Such product can then be sold commercially including to companies involved in the waste water treatment business.