工业钛渣除杂技术研究进展

钛渣是生产钛白粉的重要原料，其TiO2品位及杂质成分和含量会影响钛白粉的质量和性能，为获得高品质的钛白粉，对钛渣除杂工艺技术进行了介绍。指出盐酸常压浸出除杂法适用于高钙镁型的钛渣，能去除Ca、Mg、Fe等酸溶性杂质，但不能除去Si、Al等杂质；盐酸加压浸出除杂法能加深酸溶性杂质与酸的反应程度，缩减浸出时间，但对设备的抗压能力有较高要求；硫酸浸出除杂法能有效除去黑钛石类杂质及大部分硅酸盐类杂质，但对设备的腐蚀性较强；NaOH碱浸除杂法只适用于含Si量较高的钛渣，能有效去除钛渣中Si、Al等杂质；微波辅助除杂法具有选择性加热极性物质，能针对性去除MgO、CaO等杂质，但微波加热稳定性较低。

Research Progress on Impurity Removal Technology from Industrial Titanium Slag

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.