Method for removing metal and heavy metal ions in wet-process phosphoric acid

• Main Authors: SHI TONGSHAN, XU XIAOTONG, CHEN XIANG, LIU MEIXIA, XIE JUAN, MA PEIGEN, ZHANG CAN, YANG JUN, LIU XU
• Format: Patent
• Language: Chinese; English
• Published: 30.04.2024
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

The invention discloses a method for removing metal and heavy metal ions in wet-process phosphoric acid, which comprises the following steps: S1, adding a reducing agent into wet-process phosphoric acid with P2O5 mass concentration of 14-43% for reaction to obtain a mixture 1; s2, the mass concentration ratio of Mg to Na in the mixture 1 is adjusted to be 3-10, the mass concentration ratio of Al to Na is adjusted to be 1-9, the mass concentration ratio of Mg to K is adjusted to be 5-18, and the mass concentration ratio of Al to K is adjusted to be 3-17, and a mixture 2 is obtained; s3, adding a calcium-containing inorganic substance into the mixture 2 to obtain a mixture 3; and S4, adding a precipitant into the mixture 3, filtering, and washing. By means of the method, sodium, potassium, calcium, chromium and other metal and heavy metal impurities can be effectively removed at the same time, the phosphorus loss rate is low, and the phosphorus yield can reach 99.3% or above. 本发明公开了一种去除湿法磷酸中金属和重金属离子的方法，包括以下步骤：S