Process for the electrothermal production of yellow phosphorus

US4537756A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Karl Rottgen · Lechenich, DE
• Joachim Stendel · Münstermaifeld, DE
• Herbert Diskowski · Lechenich, DE

Key dates

• Filing date: Jul 3, 1984
• Grant date: Aug 27, 1985
• Expiry date: Jul 3, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B25/027
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The disclosure relates to a process for removing foreign components, especially zinc, from the product cycle during the production of yellow phosphorus inside and electrothermal furnace. To this end, the disclosure provides for molten ferrophosphorus and a calcium metasilicate slag and also a dust-containing gas mixture consisting essentially of carbon monoxide and phosphorus in vapor form to be taken from the furnace charged with phosphate pellets, coke and gravel. After electrostatic separation of the dust from the gas mixture, the dust is water-treated and made into a dust suspension. Crude phosphate is granulated on a granulating means using a mixture of dust suspension and binder which preferably is a clay suspension. The granulated material is calcined on a sintering device and made into phosphate pellets. A portion of the molten slag taken from the electrothermal furnace is allowed to solidify and the solidified slag is ground. The ground slag and at least a portion of dust suspension are granulated on a granulating means. The granulated slag and dust suspension are dried. It is possible for the dried granulated matter to be ground once again, to be granulated once again tog…