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Simultaneous removal of Cr(III) and V(V) and enhanced synthesis of high-grade rutile TiO2 based on sodium carbonate decomposition.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-01-10 , DOI: 10.1016/j.jhazmat.2020.122039 Guo Chen 1 , Qi Jiang 2 , Kangqiang Li 1 , Aoxi He 1 , Jinhui Peng 1 , Mamdouh Omran 3 , Jin Chen 4
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-01-10 , DOI: 10.1016/j.jhazmat.2020.122039 Guo Chen 1 , Qi Jiang 2 , Kangqiang Li 1 , Aoxi He 1 , Jinhui Peng 1 , Mamdouh Omran 3 , Jin Chen 4
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Rutile TiO2 is widely applied as the raw material to produce titanium dioxide and titanium sponge, whereas the Cr (III) and V (V) impurities in rutile TiO2 significantly affect the performance of related products. In the present work, the sodium carbonate decomposition treatment on Panzhihua titanium slag was attempted, to improve the preparation process of rutile TiO2 with high crystallinity and simultaneously reduce the chromium (Cr) and vanadium (V) content as hazardous elements. Effects of sodium carbonate decomposition treatment on the crystal composition, microstructure of rutile TiO2 were determined using XRD, SEM and Raman characterization. The recovery of Cr(III) and V(V) was achieved through leaching the roasted titanium slag by dilute sulfuric acid, with the chromium and vanadium content in the residue decreasing up to 0.03 % and 0.04 %, respectively, followed by the final product rutile TiO2 was produced by the leaching residue calcined at 1323.15 K with a duration time of 120 min, with 85.56 % of TiO2 grade. The work highlights the feasibility of synchronously preparing rutile TiO2 and removing hazardous Cr (III) and V (V) impurities from titanium slag using sodium carbonate decomposition.
中文翻译：
同时去除Cr（III）和V（V），并基于碳酸钠分解提高高级金红石型TiO2的合成。
金红石型TiO2被广泛用作生产二氧化钛和海绵钛的原料，而金红石型TiO2中的Cr（III）和V（V）杂质显着影响相关产品的性能。本文尝试对攀枝花钛渣进行碳酸钠分解处理，以改善高结晶度金红石型TiO2的制备工艺，同时降低铬（Cr）和钒（V）的含量。利用X射线衍射，扫描电镜和拉曼光谱表征，研究了碳酸钠分解处理对金红石型TiO2晶体组成，微观结构的影响。Cr（III）和V（V）的回收是通过用稀硫酸浸出焙烧的钛渣实现的，残留物中的铬和钒含量降低了0.03％和0.04％，分别是最终产物金红石型TiO2，其浸出残渣在1323.15 K下煅烧，持续时间为120分钟，TiO2品位为85.56％。这项工作强调了用碳酸钠分解同步制备金红石型TiO2和去除钛渣中有害的Cr（III）和V（V）杂质的可行性。
更新日期：2020-01-11
中文翻译：
同时去除Cr（III）和V（V），并基于碳酸钠分解提高高级金红石型TiO2的合成。
金红石型TiO2被广泛用作生产二氧化钛和海绵钛的原料，而金红石型TiO2中的Cr（III）和V（V）杂质显着影响相关产品的性能。本文尝试对攀枝花钛渣进行碳酸钠分解处理，以改善高结晶度金红石型TiO2的制备工艺，同时降低铬（Cr）和钒（V）的含量。利用X射线衍射，扫描电镜和拉曼光谱表征，研究了碳酸钠分解处理对金红石型TiO2晶体组成，微观结构的影响。Cr（III）和V（V）的回收是通过用稀硫酸浸出焙烧的钛渣实现的，残留物中的铬和钒含量降低了0.03％和0.04％，分别是最终产物金红石型TiO2，其浸出残渣在1323.15 K下煅烧，持续时间为120分钟，TiO2品位为85.56％。这项工作强调了用碳酸钠分解同步制备金红石型TiO2和去除钛渣中有害的Cr（III）和V（V）杂质的可行性。
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