Journal of Sustainable Metallurgy ( IF 2.5 ) Pub Date : 2021-07-26 , DOI: 10.1007/s40831-021-00409-4 Lin Li 1 , Tao Jiang 1, 2, 3 , Bojian Chen 1 , Jing Wen 1
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Ti-extraction blast furnace slag (TEBFS) is the metallurgical solid waste generated during titanium extraction by high-temperature carbonization and low-temperature selective chlorination process in China. The high chlorine content in slag restricts its large-scale utilization in engineering materials. To solve this problem, this study comprehensively evaluated the influence of water washing and sintering on the dechlorination efficiency of TEBFS, and the dechlorination mechanism was further analyzed. The results showed that when the liquid/solid (L/S) ratio was 5 mL/g, the washing time was 60 min, and the washing temperature was 80 °C, the minimum chlorine content in the TEBFS was 0.14%, and the leaching efficiency reached 95.98%. The sintering dechlorination experiments showed that when the sintering temperature was 1100 °C and the holding time was 90 min, the chlorine content in roasting slag was 0.03%, and the dechlorination efficiency reached 99.14%. The main phases in the roasting slag were calcium-magnesium feldspar and diopside, among others. By comparison, the energy consumption of sintering was higher, but the dechlorination effect was more pronounced. Therefore, TEBFS as a raw building material may be treated according to the requirements of chloride content in different building materials, which is benefit to the development of metallurgical industry.
Graphical Abstract
中文翻译：
提钛高炉渣作为建筑原料的综合利用：水洗烧结法去除渣中的氯
提钛高炉渣（TEBFS）是我国采用高温碳化低温选择性氯化工艺提钛过程中产生的冶金固体废物。炉渣中的高氯含量限制了其在工程材料中的大规模利用。针对这一问题，本研究综合评价了水洗烧结对TEBFS脱氯效率的影响，并进一步分析了脱氯机理。结果表明，当液固比为 5 mL/g、洗涤时间为 60 min、洗涤温度为 80 ℃时，TEBFS 中的最小氯含量为 0.14%，浸出效率达到95.98%。烧结脱氯实验表明，当烧结温度为1100℃，保温时间为90min时，焙烧渣中氯含量为0.03%，脱氯效率达到99.14%。焙烧炉渣中的主要相是钙镁长石和透辉石等。相比之下，烧结能耗较高，但脱氯效果更明显。因此，TEBFS作为建筑原料可以根据不同建筑材料中氯化物含量的要求进行处理，有利于冶金工业的发展。相比之下，烧结能耗较高，但脱氯效果更明显。因此，TEBFS作为建筑原料可以根据不同建筑材料中氯化物含量的要求进行处理，有利于冶金工业的发展。相比之下，烧结能耗较高，但脱氯效果更明显。因此，TEBFS作为建筑原料可以根据不同建筑材料中氯化物含量的要求进行处理，有利于冶金工业的发展。
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