In order to recover pure alumina and synthesize magnesium spinel from black dross, a hydrometallurgical process was developed. This process consisted of 1) NaOH leaching of the mechanically activated black dross, 2) removal of silicate(IV) from the leaching solution by adsorption followed by coagulation, 3) precipitation of aluminum hydroxide from the purified leaching solution, 4) synthesis of magnesium spinel. Continuous experiments on the above-mentioned steps at optimum conditions were performed. Magnesium spinel was synthesized at 1000 °C for 5 hs by the co-precipitation method. The purity of spinel was 99.99 % and its characteristics were analyzed by XRD and SEM. Mass balance of the whole process indicated that the recovery percentage of alumina from the black dross was only 34 % owing to low leaching percentage. Further work on the pretreatments of black dross to improve its dissolution behavior is needed.

为了回收纯氧化铝并从黑渣中合成镁尖晶石，开发了湿法冶金工艺。此过程包括1）NaOH浸出机械活化的黑渣，2）通过吸附从吸附溶液中去除硅酸盐（IV），然后进行凝聚，3）从纯化的浸出溶液中沉淀出氢氧化铝，4）合成镁尖晶石。在最佳条件下对上述步骤进行了连续实验。通过共沉淀法在1000°C下合成镁尖晶石5 hs。尖晶石的纯度为99.99％，并通过XRD和SEM对其特性进行了分析。整个过程的质量平衡表明，由于低浸出率，从黑渣中回收氧化铝的比例仅为34％。