| 摘要 |
PURPOSE: A phosphoric acid collecting method from wastewater is provided to reduce the generation amount of waste by collecting phosphoric components from the phosphoric wastewater. CONSTITUTION: A phosphoric acid collecting method from wastewater comprises the following steps: inserting calcium hydroxide into the wastewater containing phosphoric acid, hydrofluoric acid, and sulfuric acid, for segregating the sulfuric acid into gypsum and hydrofluoric acid into calcium fluoride; maintaining the phosphoric acid inside the wastewater in a phosphate state; removing precipitates from the wastewater, and inserting the calcium hydroxide into supernate fore precipitating calcium phosphate; and collecting the precipitated calcium phosphate. |
