Defrothing method and apparatus

US4818377A · kind A · utility

Assignee

• J.M. Voith GmbH · DE

Inventors

• Peter Schweiss · Langenau, DE
• Hans-Dieter Dorflinger · Heidenheim, DE

Key dates

• Filing date: Oct 21, 1987
• Grant date: Apr 4, 1989
• Expiry date: Oct 21, 2007

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B03D1/1456
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A defrothing apparatus whose inlet opening of the foamed liquid contained in a foam duct of a primary flotation apparatus is provided in the bottom of the foam duct. Starting from the lower area of the defrothing apparatus, a rotary flow (potential vortex) is generated in the apparatus by a recirculated lqiuid quantity from a secondary flotation apparatus. In the core of the rotary flow the gas quantity (air) is collected and removed through a removal pipe. Consequently, the foamed liquid from the foam duct of the primary flotation stage which is pumped to the secondary flotation stage contains small shares of gas relative to the total quantity of liquid, thereby allowing the pump to be optimally sized of efficiency and better control of the system.