钛白废液制备黄钾铁矾的实验研究

Experimental Study on Preparation of Jarosite from Titanium White Waste Water

以钛白废液为原料,通过添加氯酸钾和氢氧化钾制备黄钾铁矾,考察了反应温度、溶液pH值和反应时间对钛白废液中Fe沉淀率的影响,同时对沉淀物进行微观形貌及物相组成分析。结果表明:在温度95℃、溶液pH值2.0和反应时间40min的条件下,钛白废液中的Fe沉淀率大于99%;沉淀物为黄钾铁矾针状晶体,滤液中除SO_4^(2-)和Fe^(2+)浓度显著降低外,Ti、V和Sc等稀有金属离子浓度几乎未改变,有利于下一步稀有金属的分离提纯。

Jarosite was prepared from titanium white waste water by adding potassium chlorate and potassi- um hydroxide. The effects of reaction temperature,solution pH and reaction time on Fe precipitation rate were investigated. And microstructure and phase composition of the precipitated product were also ana- lyzed. The results show that the precipitation rate of Fe from titanium white waste water is more than 99% under the conditions of temperature of 95 ℃, solution pH of 2.0 and reaction time of 40 min. The precipita- ted product is the acicular crystal of jarosite. In addition to the significant decrease of SO4^2-and Fe2＋ concentrations in the filtrate,the contents of the rare metal ions such as Ti,V and Sc are almost unchanged, which is beneficial for the separation and purification of rare metals in the next process step.