| About 55% titanium contained inside Panzhihua titanium-vanadium magnetite ore enters the enriched iron concentrate, and then goes into blast-furnace slag during subsequent blast-furnace puddling. About 3 million tons of this slag containing 22-23% titanium is deposited in Panzhihua. The slag can neither be utilized in the production of cement due to high Ti content, nor be used to extract Titanium due to its relatively low Ti content. The slag is piled up like mountains. It not only takes a great amount of farmland but also contaminates the environment around. Therefore, effective utilization of the slag is an urgently environmental problem.The present research firstly theoretically analyzed the possobility of the utilization of this slag. Thermodynamic calculation indicates that the reaction of the Ti-bearing blast-furnace slag with sulfuric acid has a large thermodynamic potential. Moreover, water-quenched slag has thermodynamically and kinetically benefits for the leaching reaction. A acid leaching routine of the water-quenched slag was proposed.Preliminary experiments show that the water quenching remarkably accelerated the leaching process of the slag compared with the naturally cooled slag. It was found that the leaching was very fast in the initial period when the Ti extraction was below 80%, and then slowed down dramatically and stopped in the subsequent period. Hereby, a two-step leaching process was proposed.In the first stage, the slag was leached with a 20-30% sulfuric acid solution at...
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