Recovering phosphorus from ash comprises acid digestion, purification by liquid-liquid extraction and phosphate precipitation

摘要

Recovering phosphorus from ash comprises bringing phosphorus compounds into solution by acid digestion, purifying the solution by liquid-liquid extraction, especially to remove iron, and precipitating phosphates from the solution. An independent claim is also included for n installation for carrying out the above process, comprising for digesting the ash with a mineral acid, a filtration unit for removing insolubles, a liquid-liquid extraction unit and a vessel for phosphate precipitation.