Fluoride ion removal agents and removal methods in wastewater

Abstract

This invention relates to a technology for efficiently removing fluoride ions from wastewater containing fluoride ions. By providing a fluoride ion removal agent and method containing (A) cerium compounds and (B) potassium compounds and / or lithium compounds, fluoride ions can be removed more efficiently and stably than prior art. This technology can be applied to various fields such as semiconductor manufacturing processes, metal surface treatment processes, and plating processes.