During hydrochloric acid leaching of bauxite reaction residue (BRR) produced from coagulant industry, the effects of hydrochloric acid concentration, liquid solid ratio and silica remove on the extraction of aluminum were studied, at atmospheric pressure (85 °C). The aluminum dissolution rate under the optimal conditions (8 mol l^-1, L S^-1 5:1) was only 44.15%. After the leached residue was treated by alkali to selectively remove silica and then leached with hydrochloric acid at the same conditions, the aluminum extraction rate rarely changes, even if the silica removal rate reaches 81.52%. Direct leaching after mechanical activation for 10 h, resulted in the extraction rate increased by 5.05%. However, compared with the optimal condition (8 mol L^-1, 5:1, 10 h) under atmospheric pressure, the aluminum extraction rate was only 49.2%, while up to 84.23% of aluminum was extracted from BRR at high-pressure (210 °C). In addition, the leaching experiment and kinetics of aluminum were analyzed in-depth under high-pressure. The apparent activation energy of aluminum dissolution was found to be 20.82 kJ mol^-1, and the dissolution process is determined by liquid diffusion. Obtained leachate has been well recycled without waste discharged, which provides a theoretical basis for the BRR utilization.

在凝结剂工业生产的铝土矿反应残留物（BRR）的盐酸浸出过程中，研究了在大气压（85°C）下盐酸浓度，液固比和去除二氧化硅对铝提取的影响。在最佳条件下（8 mol l ^-1，LS ^-1 5：1），铝的溶解率仅为44.15％。在相同条件下用碱处理浸出的残渣以选择性除去二氧化硅，然后在相同条件下用盐酸浸出后，即使二氧化硅的去除率达到81.52％，铝的萃取率也很少变化。机械活化10 h后直接浸出，提取率提高5.05％。但是，与最佳条件（8 mol L ^-1，5：1、10 h）在大气压下，铝的提取率仅为49.2％，而在高压（210°C）下从BRR中提取的铝高达84.23％。此外，还对高压下铝的浸出实验和动力学进行了深入分析。发现铝溶解的表观活化能为20.82kJ mol ^-1，并且溶解过程由液体扩散确定。获得的渗滤液已经很好地循环利用，没有废物排放，这为BRR的利用提供了理论基础。