Abstract: Titanium slag is an important raw material for the production of titanium dioxide. Its TiO2 grade and impurity composition and content will affect the quality and performance of titanium dioxide. In order to obtain high quality titanium dioxide， the technology of titanium slag removal is introduced. It was pointed out that hydrochloric acid atmospheric pressure leaching and impurity removal method is suitable for high calcium magnesium type titanium slag， can remove acid soluble impurities such as Ca， Mg， Fe， but cannot remove impurities such as Si and Al； hydrochloric acid pressure leaching and impurity removal method can deepen reaction degree of acid solubility with acid. The degree of reaction between impurities and acid reduces the leaching time， but it has higher requirements on the pressure resistance of the equipment. The sulfuric acid leaching and impurity removal method can effectively remove the black titanium oxide impurities and most of the silicate impurities， but the corrosion of the equipment is intense. NaOH alkaline leaching method is only suitable for titanium slag with high Si content， which can effectively remove impurities such as Si and Al in titanium slag； microwave assisted impurity removal method can selectively heat polar substances and can be targeted remove impurities such as MgO and CaO， but the microwave heating stability is low.

Key words: Titanium slag, Acid leaching, Alkali leaching, Microwave, Impurity removal