Study on the Organics Pretreatment of Crude Titanium Tetrachloride with High Content of Vanadium for Vanadium Removal
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摘要: 攀钢高炉渣提钛工艺生产出的粗四氯化钛含钒量高 (4.9‰), 不能直接用攀钢现有的铝粉除钒工艺。为解决四氯化钛含钒高的问题, 提出了在铝粉除钒前采用有机物预处理除钒的工艺, 并对影响除钒效果的主要工艺参数, 如有机物种类及用量、温度和时间等进行了优化。结果表明, 采用3%矿物油在45℃下预处理30 min可以将粗四氯化钛中的钒降至1.667‰。且预处理产生的除钒泥浆具有较好的沉降性能, 分离泥浆后得到的四氯化钛满足铝粉除钒对原料的要求。另外, 蒸干除钒泥浆所得的尾渣中含有大量的钒 (8.06%), 具有较高的回收利用价值。Abstract: The crude titanium tetrachloride obtained from the titanium recovering process of Pangang blast furnace slag has a high vanadium content (4.9‰),which cannot be effectively removed by the existing process with aluminum powder. To solve this problem,this paper proposes a pretreatment method by organics for vanadium removal before the following process of vanadium elimination by aluminum powder,and the main technological parameters influencing vanadium removal efficiency,e.g. the species and dosage of organics,temperature and time,were optimized. The results show that the vanadium content of crude titanium tetrachloride can be decreased to 1.667‰ after the pretreatment at 45 ℃ for 30 min with 3% mineral oil. The slurry produced in pre-processing has a good settling property,and the titanium tetrachloride after separation of the slurry meets the feedstock requirements of vanadium removal process by aluminum powder. Moreover,the slag obtained by drying the slurry of vanadium removal has a high recovery value since it contains a high concentration of vanadium(8.06%).
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Key words:
- crude titanium tetrachloride /
- vanadium removal /
- organics /
- pretreatment
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