摘要:
采用钠化焙烧法从废SCR脱硝催化剂中回收钛,研究了碱用量、焙烧温度、时间、物料粒度、不同硫酸浓度等因素对钛提取率的影响。根据试验结果确定了最佳的焙烧反应条件为:碱用量为理论用量的1.2倍,焙烧温度700℃,焙烧时间3 h,物料粒度-150μm。焙烧熟料水洗后采用质量浓度为45%的硫酸浸出,钛浸出率大于89%。浸出液经常压水解制备二氧化钛,钛沉淀率大于93%,二氧化钛产品纯度大于93%。
关键词:
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提钛 /
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废催化剂 /
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SCR /
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钠化焙烧
Abstract:
Titanium was recovered from spent SCR catalyst by sodium roasting.The effects of sodium dosage,roasting temperature,roasting time,material particle size and sulfuric acid concentration on titanium leaching rate were studied.From the experimental results,the optimum roasting conditions were selected at the alkali dosage of 1.2 times of the theoretical value,the roasting temperature of 700 ℃,the roasting time of 3 h,and the material particle size of -150 μm.The roasting clinker after washing was leached by sulfuric acid with 45% mass concentration,resulting in more than 89% of the titanium leaching rate.Titanium dioxide was prepared by hydrolysis of the leaching solution,with the titanium precipitation rate and purity of titanium dioxide more than 93% and 93%,respectively.
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