【摘要】 提出一种硫酸铵（AS）加压热解-酸浸新工艺,从含钛高炉渣中（TBBF）分段回收有价金属。结果表明,当在铵矿比3:1、370°C的条件下热解90 min时,钛、铝和镁的提取率分别为94.5%、91.9%和97.4%。酸浸液在沸腾状态下重结晶除杂可获得TiO2含量为94.1%的钛产品。上述结晶母液分别调节pH=6和pH≥12.2,可获得合格的氧化铝和氧化镁产品。XRD和SEM-EDS分析表明,焙烧样品中主要物相为NH₄AlSO₄、CaSO₄和TiOSO₄。热力学分析显示,在最优条件下,原矿中钙钛矿、镁铝尖晶石和透辉石能与AS产生的中间产物自发反应。更多还原

【Abstract】 A novel method of extracting valuable metals from Ti-bearing blast furnace slag（TBBF slag） via pressure pyrolysis of recyclable ammonium sulfate（AS）-acid leaching process was proposed. The results show that when pressurized roasting at an AS-to-slag mass ratio 3:1 and 370 °C for 90 min, the extraction rates of titanium, aluminum and magnesium reached 94.5%, 91.9% and 97.4%, respectively. The acid leaching solution was subjected to re-crystallization in a boiling state to obtain a titanium product having a TiO₂ content of 94.1%. The above crystallization mother liquor was adjusted to pH=6 and p H≥12.2, respectively, and then qualified Al₂O₃ and MgO products were obtained. The analysis through XRD and SEM-EDS proves that the main phases in roasted samples were NH₄ AlSO₄, CaSO₄ and TiOSO₄. The thermodynamic analysis presents that the main minerals of perovskite, spinel and diopside in raw ore could spontaneously react with the intermediate produced by AS under optimal conditions.更多还原