深还原钛渣硫酸法制取钛白实验研究

Study on preparation of titanium dioxide from further reduced titanium slag

以含钛铁精矿直接还原冶炼的含钛物料(深还原钛渣)为原料,对硫酸法制取颜料级钛白粉的工艺进行了研究。实验结果表明,深还原钛渣具有良好的酸解性能,酸解率可达97%;酸解后得到的钛液过滤性能好;但酸解钛液中氧化镁和氧化铝浓度过高,所以直接以该钛液为原料制得的钛白颜料性能差。采用深还原钛渣和钛精矿按一定比例混合酸解,可以避免钛液杂质含量过高对最终钛白产品质量造成的影响。深还原钛渣较佳用量为不高于钛原料总质量的20%。

The preparation of pigment-grade titanium dioxide by sulfuric acid process with titanium contained material （further reduced titanium slag） from direct reduction of titanium-bearing iron ore concentrate as the raw material was studied. Experimental results showed that the acidolysis performance of further reduced titanium slag was excellent and the acidolysis rate reached 97%.The filtration performance of titanium solution obtained after the aeidolysis was fine.However the excess of MgO and A1203 in the titanium solution caused the poor pigment performance of titanium dioxide product, which was directly prepared by this titanium solution.The suitable concentration of MgO and A1203 in titanium solution could be acquired by mixing the further reduced titanium slag with titanium concentrate at a certain ratio.The bad effects on the final product quality of titanium dioxide from the impurity could be avoided in this way.The optimum dosage of further reduced titanium slag was not higher than 20% of the total mass of titanium material.