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碱度对高铬型钒钛矿烧结过程的影响

ISSN号：1674-9669
期刊名称：有色金属科学与工程
时间：2014.7
页码：18-22
分类：TG146[金属学及工艺—金属材料;一般工业技术—材料科学与工程;金属学及工艺—金属学]
作者机构：[1]中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室,北京100190, [2]中国科学院过程工程研究所绿色过程与工程院重点实验室,北京100190, [3]中国科学院大学,北京100049
相关基金：Project（51090380）supported by the National Natural Science Foundation of China; Projects（2013CB632604,2013CB632601）supported by the National Basic Research Program of China; Project（51125018）supported by the National Science Foundation for Distinguished Young Scholars of China; Project（KGZD-EW-201-2）supported by the Key Research Program of the Chinese Academy of Sciences; Projects（51374191,51402303）supported by the Natural Science Foundation for the Youth,China
相关项目：钒钛组元相际迁移的动力学规律及其影响因素

关键词：黑泥, 钛回收, NaOH水热转化, 水洗, H2SO4浸出, tionite, titanium recovery, NaOH hydrothermal conversion, water washing, H2SO4 leaching

中文摘要：

提出一种从黑泥中回收利用钛的新工艺,该工艺包括NaOH水热转化、水洗和H2SO4浸出制备TiO2。在优化的反应条件下,即NaOH溶液浓度为50%（质量分数）、NaOH/黑泥质量比为4：1、反应温度为240°C、反应时间为1 h和氧气分压为0.25 MPa,钛转化率可达97.2%,主要含钛产物是Na2TiO3。非目标产物Na2TiSiO5在水洗中保持稳定,在水热反应中提高NaOH浓度可以抑制Na2TiSiO5的生成。水热产物经过水洗后,97.6%的Na^＋可以回收。含有NaOH的溶液经过浓缩之后可以回用。在较低温度下,水洗物料中96.7%的钛能被较低浓度的硫酸浸出得到钛液。利用所得钛液进一步制备合格TiO2产品。

英文摘要：

To recover titanium from tionite, a new process consisting of NaOH hydrothermal conversion, water washing, and H2SO4 leaching for TiO2 preparation was developed. The experimental results show that under the optimum hydrothermal conversion conditions, i.e., 50% NaOH （mass fraction） solution, NaOH/tionite mass ratio of 4：1, reaction temperature of 240 ℃reaction time of 1 h and oxygen partial pressure of 0.25 MPa, the titanium was mainly converted into Na2TiO3, and the conversion was 97.2%. The unwanted product Na2TiSiO5 remained stable in water washing, and its formation was prevented by improving NaOH concentration. In water washing process, about 97.6% of Na＋ could be recycled by washing the hydrothermal product. The NaOH solutions could be reused after concentration. 96.7% of titanium in the washed product was easily leached in H2SO4 solution at low temperatures, forming titanyl sulfate solution to further prepare TiO2.

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