Project Introduction

The gold ore in Paramaribo, Suriname is sericite altered rock type and poor sulfide gold-bearing quartz vein type, and the gold has very fine dissemination size, extremely inhomogeneous distribution and poor relationship with sulfide. Most of the ore is symbiotic with non-metal gangue minerals and belongs to the gold ore that is difficult to float. The experimental results show that gold heap leaching is the most reasonable process for processing the ore.

Gold Leaching Process

The concentration of CNFREE environmental gold leaching reagent is controlled at 0.10%, and the spraying intensity is 20-30L/(TPD) in the initial stage; after the middle stage, the concentration can be reduced to 0.05%-0.08%, and it can be adjusted to 0.03%-0.05% in the tail stage. The spray intermittent ratio is 1:2. Spray intensity and spray intermittent ratio should be adjusted when there is obvious infiltration problem in the heap. The leached rich liquid is adsorbed in the whole course, with adsorption strength of 12-20 L/(tpd). Leaching ends when the liquid rich grade is below 0.2g/m or no economic benefits are produced. Solid calcium hypochlorite is sprinkled onto the surface of the heap and then sprayed with water after the leaching. When p(CN-)is less than 0.5×10 in the return liquid, the disinfection reaches the standard. The leaching residue can be unloaded, transported to the slag discharge storage, and the waste liquid is directly discharged.

Process Indicator

The gold mine recovery rate is as high as 60%.