Renewable magnesium removing agent and its use in preparation of low-magnesium lithium-rich brine

US11180369B2 · kind B2 · utility

Assignee

• QINGHAI INSTITUTE OF SALT LAKES, CHINESE ACADEMY OF SCIENCES · CN

Inventors

• Dongdong Li · Canton, US
• Wu Li · 红钢城街道, CN
• Yaping Dong · Solo Court, CN
• Dandan Gao · Solo Court, CN

Key dates

• Filing date: Nov 8, 2019
• Grant date: Nov 23, 2021
• Expiry date: Nov 8, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01F5/305
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A renewable magnesium removing agent and its use in a preparation of a low-magnesium lithium-rich brine are provided. The magnesium removing agent includes a magnesium phosphate double salt of an alkali metal or ammonium. A regeneration of the magnesium removing agent is realized by adding the magnesium removing agent into Mg2+-containing chloride salt solution, wherein Mg2+ in the chloride salt solution and the magnesium removing agent are subjected to a magnesium removing reaction to form a solid-phase reaction product and carrying out a solid-liquid separation on an obtained mixed reaction product after the magnesium removing reaction is ended to separate the solid-phase material comprising a magnesium phosphate hydrate and then separating out a chlorine salt of the alkali metal or the ammonium from a remaining liquid-phase material, and finally carrying out a regeneration reaction on the magnesium phosphate hydrate and the chlorine salt of the alkali metal or the ammonium.