Process for producing a calcium phosphate reactant, reactant obtained and use thereof in the purification of liquid effluents

US10814303B2 · kind B2 · utility

Assignee

• SOLVAY SA · BE

Inventors

• Patrick Perrin · Rancho Palos Verdes, US
• Olivier Jacques F. J. G. Bodson · Limal, BE
• Thierry Delplanche · Court-Saint-Etienne, BE
• Dirk BREUGELMANS · Vilvoorde, BE

Key dates

• Filing date: May 18, 2015
• Grant date: Oct 27, 2020
• Expiry date: May 18, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C02F2303/16
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for producing a calcium phosphate reactant, according to which: in a first step, use is made of a source of calcium and a source of phosphate ions in water, in a molar ratio that is adjusted so as to obtain a Ca/P molar ratio of between 0.5 and 1.6, and the source of calcium is reacted with the phosphate ions at a pH of between 2 and 8, in order to obtain a suspension (A) of calcium phosphate, and in a second step, added to the suspension (A) are an alkaline compound comprising hydroxide ions in order to set a pH of more than 8 and an additional source of calcium in order to obtain a suspension (B) of calcium phosphate reactant having a Ca/P molar ratio of more than 1.6.A calcium phosphate reactant obtainable by such a process.