An alkali leaching-acid leaching method was proposed to extract vanadium and enrich titanium from modified Ti-bearing blast furnace slag (MTBBFS). The optimal alkali leaching conditions were NaOH concentration 2.0 mol/L, leaching temperature 95 °C, and leaching time 90 min. The leaching ratio of V was 91.30%. After 4 times cyclic alkaline leaching, the vanadium concentration of leaching solution increased to 14.70 g/L and the solution could be used to recover vanadium by the precipitation of ammonium salt. The optimum acid leaching conditions were HCl concentration 2.0 mol/L, leaching temperature 65 °C, and leaching time 60 min. The TiO₂ content of synthetic rutile and the total recovery ratio of Ti were 99.15% and 97.77%, respectively. Due to the TiO₂ content of the rutile >99.00%, the rutile was a high-quality feedstock for titanium dioxide with the chloride process. Moreover, the mechanism of vanadium extraction and the mechanism of alkali leaching-acid leaching reaction process were discussed

提出了一种碱浸-酸浸法，从改性含钛高炉矿渣（MTBBFS）中提取钒并富集钛。碱浸出的最佳条件是NaOH浓度为2.0 mol / L，浸出温度为95°C，浸出时间为90 min。V的浸出率为91.30％。经过4次循环碱浸后，浸出液中的钒浓度增至14.70 g / L，该溶液可通过铵盐的沉淀回收钒。最佳的酸浸条件为HCl浓度为2.0 mol / L，浸出温度为65°C，浸出时间为60 min。合成金红石的TiO ₂含量和Ti的总回收率分别为99.15％和97.77％。由于TiO ₂金红石的含量> 99.00％，金红石是氯化法生产的二氧化钛的优质原料。此外，还讨论了钒的萃取机理和碱浸-酸浸反应过程的机理。