Recovery of phosphorus values from waste phosphoric acid liquors

摘要

The phosphorus values from waste phosphoric acid containing organic contaminents such as wastes obtained in the manufacture of quinacridone pigments can be recovered in purified form by hydrolyzing phosphate esters, removing any formed alcohol, dissociating any amine phosphates and separating any free amine. The phosphorus values can be recovered in a purified form as phosphate salts.