Recent Investigations of Nickel Laterite Agglomeration for Enhanced Heap Leaching

Despite nickel laterites accounting for about 60% of the world’s nickel mineralization, the commercial processing of complex, low-grade nickel laterite ores through conventional beneficiation remains challenging, particularly in heap leaching. This study aims to investigate agglomeration behavior of actual nickel laterite ores and select mineral compositions, focusing on the critical precursor steps for effective heap leaching. Methodologically, isothermal batch agglomeration experiments using sulphuric acid as a binder were conducted to produce coarse granules sized between 5 and 40 mm, which were subsequently characterized using various techniques. The investigation into the role of feed ore characteristics such as mineralogy and particle size, alongside binder composition and dosage, revealed insights into agglomeration behavior and granule properties. Results indicated that specific combinations of mineralogy, binder formulation, and curing conditions significantly influenced both agglomeration effectiveness and final granule structural characteristics. The findings underscore the potential for enhanced heap leaching efficiency when optimized agglomeration practices are employed, offering valuable implications for nickel laterite processing in industrial applications.