Removal of impurities from bauxite

摘要

Impurities are removed from bauxite by leaching a bauxite ore using a leach solution to dissolve impurities from the bauxite ore and form a pregnant leach solution containing the impurities in solution, removing the leached bauxite ore from the pregnant leach solution using a solid-liquid separation process to produce a clarified pregnant leach solution, and concentrating the clarified pregnant leach solution to recover a recycle stream including water for recycling to the leaching process. In addition, the concentrated leach solution can be subjected to an impurity removal process to recover purified leach solution for recycling to the leaching process.