Abstract: The leaching behavior of water-quenched Ti-bearing blast furnace slag in sulfuric acid was investigated. The leaching process proceeded fast in the initial period, as shown by the dissolution results of aluminum and magnesium compounds, and part of amorphous titanium compounds. The leaching reaction was slowed down in the last period due to the formation of insoluble layer over the un-reacted calcium titanate particles. A two-step leaching process was designed, in which the slag was pre-leached with a 20% sulfuric acid solution. The pre-leaching could dissolute most of aluminum, about 64% of magnesium and 46% of titanium. The residue of pre-leaching was further leached with the help of mechanical milling. The two-step leaching operation resulted in a total Ti leaching rate over 94%.

Key words: titanium-bearing blast furnace slag, sulfuric acid dissolution, milling, leaching

摘要： 对水淬含钛高炉渣的酸解行为进行了研究. 浸出分为两个阶段，前期浸出迅速而后期浸出缓慢. 研究表明，前期主要是包含钛、铝和镁等成分的非晶态物料的溶出，而后期则是被难溶物种包裹的小晶粒钛酸钙的溶出. 因此，设计了一个分段浸出方案. 采用20%硫酸初浸，Al几乎全部浸出，而Mg和Ti的浸出率分别为64%和46%. 对初浸渣进行了强化浸出，发现边磨边浸出可显著提高钛的浸出率. 经两段浸出后，高炉渣中钛的总浸出率达到94%以上.

关键词: 含钛高炉渣, 硫酸分解, 磨矿, 浸出