Extraction of Valuable Components from Alkali Fused Blast Furnace Slag Containing High Concentration of Titanium by Two Leaching Methods
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摘要: 针对碱熔法处理高钛型高炉渣提取TiO2能耗高、经济成本高等问题,采用氢氧化钠为助剂,通过在较低温度下焙烧先提取出渣中的Si、Al组分,富集Ti组分,再通过稀硫酸酸解法实现提钛的目的,探讨在"空冷-水浸"与水淬"两种浸取方式下碱熔条件对SiO2和Al2O3提取率的影响以及酸解条件对TiO2提取率的影响。优化工艺参数为:碱熔温度500℃、配碱系数1.5、碱熔时间150 min,此条件下"空冷-水浸"方式对SiO2、Al2O3的提取率分别为56.41%、89.00%,"水淬"方式对SiO2、Al2O3的提取率分别为63.45%、86.25%;硫酸质量分数50%、酸渣质量比1.25~1.5:1、酸解温度160~170℃、酸解时间2.0 h,此条件下对TiO2的酸解率达到91.21%。Abstract: Aiming at the problems of high energy consumption and high economic cost for the extraction of TiO2 from blast furnace slag containing high concentration of titanium by alkali fusion,the slag was roasted with sodium hydroxide at a lower temperature to extract Si and Al components firstly making TiO2 enriched in the slag,then the TiO2 component was abstracted by dilute sulfuric acid.The effects of alkali fusion conditions on the extraction rate of SiO2 and Al2O3 from blast furnace slag containing high concentration of titanium respectively by two leaching processes,air cooling-water leaching and water quenching were investigated.Furthermore,the influence of acidolysis conditions on TiO2 extraction was also studied in this paper.Under the optimum conditions of alkali fusion at 500℃ for 150 min with 1.5 of alkali addition coefficient,the extraction rate of SiO2 and Al2O3 were separately 56.41% and 89.00% by air cooling-water leaching while respectively 63.45% and 86.25% by water quenching.The acidolysis rate of TiO2 was 91.21% at the conditions of 50% for mass fraction of sulfuric acid,1.25~1.5:1 for mass ratio of acid to slag,160~170℃ and 2.0 h respectively for temperature and time of acidolysis process.
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