Preparation of nano TiO2 from Ti-bearing blast furnace slag by molten salt method

doi:10.11949/j.issn.0438-1157.20141029

CIESC Journal ›› 2015, Vol. 66 ›› Issue (2): 827-833.DOI: 10.11949/j.issn.0438-1157.20141029

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Preparation of nano TiO₂ from Ti-bearing blast furnace slag by molten salt method

LI Xin¹, YU Honghao^1,2,3, ZHANG Houfang¹, XUE Xiangxin^2,3

1 School of Material Science and Engineering, Shenyang Ligong University, Shenyang 110159, Liaoning, China;
2 School of Material and Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China;
3 Liaoning Key Laboratory for Recycling of Metallurgical Resources, Shenyang 110819, Liaoning, China

Received:2014-07-09 Revised:2014-10-26 Online:2015-02-05 Published:2015-02-05
Supported by:
supported by the National Natural Science Foundation of China (51304139, U1360204) and Liaoning Province Education Administration (L2013089).

熔盐高效分解含钛高炉渣制备纳米二氧化钛

李鑫¹, 于洪浩^1,2,3, 张侯芳¹, 薛向欣^2,3

1 沈阳理工大学材料科学与工程学院, 辽宁沈阳 110159;
2 东北大学冶金资源与生态环境研究所, 辽宁沈阳 110819;
3 辽宁省冶金资源循环科学重点实验室, 辽宁沈阳 110819

通讯作者: 于洪浩
基金资助:
国家自然科学基金项目(51304139,U1360204);辽宁省教育厅项目(L2013089)。

Abstract

Abstract:

A novel process was proposed for preparing titanium dioxide by decomposition of titanium-bearing blast furnace slag (TBBFS) in molten NaOH-NaF system. Thermodynamic analysis was conducted on the molten salt decomposition of TBBFS. The effects of mass ratio of alkali and slag, reaction time and reaction temperature on titanium extraction and the effects of pH and hydrolysis temperature on purity of titanium dioxide were discussed. The reaction of sodium titanate from TBBFS with sodium hydroxide was feasible thermodynamically. When optimum mass ratio of alkali and slag was 3:1, reaction temperature was 500℃, and reaction time was 3 h, titanium extraction was 99.8%. Optimum pH and hydrolysis temperature were 0.1—0.2 and 100℃ respectively. Analysis results indicated good sphericity and dispersibility of TiO₂ particles with diameter about 100 nm.

Key words: Ti-bearing blast furnace slag, molten salt, TiO₂, leaching, nanoparticles, thermodynamics

摘要：

采用熔盐法对含钛高炉渣进行高效分解并提取含钛组分,利用含钛滤液为原料制备了纳米二氧化钛粉体。对熔盐分解含钛高炉渣进行了热力学分析,并研究了碱渣比、熔盐反应温度及熔盐反应时间对钛组分浸出率的影响和pH及水解温度对二氧化钛产品纯度的影响。实验结果表明高炉钛渣在氢氧化钠熔盐中反应生成钛酸钠在热力学上是可行的。确定了最佳的碱渣比为3:1,最佳熔盐反应温度为500℃,最佳反应时间为3 h,在此条件下钛元素的浸出率为99.8%。得出较佳的水解pH范围为0.1～0.2,最佳水解温度为100℃。实验中制备的纳米二氧化钛粒子球形度好,粒度大小均匀且分散性好,颗粒直径为100 nm左右。

关键词: 含钛高炉渣, 熔盐, TiO₂, 浸取, 纳米粒子, 热力学

CLC Number:

TQ110.2

LI Xin, YU Honghao, ZHANG Houfang, XUE Xiangxin. Preparation of nano TiO₂ from Ti-bearing blast furnace slag by molten salt method[J]. CIESC Journal, 2015, 66(2): 827-833.

李鑫, 于洪浩, 张侯芳, 薛向欣. 熔盐高效分解含钛高炉渣制备纳米二氧化钛[J]. 化工学报, 2015, 66(2): 827-833.

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Preparation of nano TiO₂ from Ti-bearing blast furnace slag by molten salt method

熔盐高效分解含钛高炉渣制备纳米二氧化钛

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