The choice of mineral processing process is the key to determining the gold recovery rate and production efficiency of a gold processing plant, especially for the Tanzania 1,200t/d gold project with complex ore properties. The project involves two types of ore—sulfide ore with a high gold grade of 10.7g/t and oxide ore with a relatively low grade of 2.4g/t, and gold is the only valuable element. To efficiently recover gold from these two types of ore, Xinhai’s technical team经过 in-depth analysis of ore properties and a large number of experimental verifications, finally determined to adopt the all-slime cyanidation gold extraction process, which achieved excellent leaching effects—93.75% for sulfide ore and 91.58% for oxide ore, setting a high standard for gold recovery in the local area.
All-slime cyanidation is a mature and efficient gold extraction process, which is mainly suitable for processing fine-grained disseminated gold ore, oxide gold ore and sulfide gold ore after oxidation roasting. Its core principle is to fully dissociate gold particles from gangue minerals through fine grinding, and then use cyanide solution to leach gold, so as to realize the separation of gold from ore. For the Tanzania project, the all-slime cyanidation process is particularly suitable because of the fine embedded particle size of gold in both sulfide and oxide ores, which requires sufficient dissociation through grinding to ensure the leaching effect.
The reason why Xinhai chose the all-slime cyanidation process for the Tanzania project is not only based on the ore properties, but also considering the project’s production scale and economic benefits. Compared with other gold extraction processes such as gravity concentration-cyanidation combined process, the all-slime cyanidation process has the advantages of simple process flow, high gold recovery rate, stable operation and low production cost, which is very suitable for large-scale production of 1,200t/d. At the same time, the process can effectively handle both sulfide and oxide ores, avoiding the need to set up two sets of independent processing systems, which greatly reduces the project’s investment and operation cost.
To ensure the leaching effect of the all-slime cyanidation process, Xinhai made targeted optimizations in the key links of the process. First of all, in the grinding stage, a closed-circuit grinding and cyclone classification process was adopted to ensure that the ore is ground to the required particle size, so that the gold particles are fully dissociated. The particle size of the grinding product directly affects the leaching rate—if the particle size is too coarse, the gold particles cannot be fully contacted with the cyanide solution, resulting in low leaching rate; if the particle size is too fine, it will increase the viscosity of the pulp, affect the leaching efficiency and increase the energy consumption. Xinhai’s technical team determined the optimal grinding particle size through a large number of experiments, balancing the leaching effect and energy consumption.
Secondly, in the cyanidation leaching stage, Xinhai optimized the leaching parameters such as cyanide concentration, leaching time, pulp pH value and aeration rate. For sulfide ore with high gold grade, the leaching time was properly extended and the cyanide concentration was adjusted to ensure that the gold is fully leached; for oxide ore with low grade but easy leaching, the leaching parameters were optimized to improve the leaching efficiency and reduce the consumption of cyanide. At the same time, Xinhai adopted advanced leaching equipment to ensure the uniform mixing of pulp and cyanide solution, and improve the contact efficiency between gold particles and leaching agent.
The application of the all-slime cyanidation process in the Tanzania 1,200t/d gold project has achieved remarkable results. The leaching rate of sulfide ore reached 93.75% and that of oxide ore reached 91.58%, which are higher than the average level of the same type of gold projects. This not only ensures the full utilization of gold resources, but also brings considerable economic benefits to the customer. In addition, the all-slime cyanidation process adopted by Xinhai has good environmental protection performance—through the effective treatment of cyanide-containing wastewater and tailings, the environmental pollution caused by the production process is minimized, which meets Tanzania’s strict environmental protection requirements.
The successful application of the all-slime cyanidation process in the Tanzania project fully demonstrates Xinhai’s strong technical strength and ability to customize solutions according to ore properties. This process not only provides a reliable technical guarantee for the project’s stable operation and high efficiency, but also provides a valuable reference for the processing of similar gold ores in East Africa. In the future, Xinhai will continue to carry out technological innovation, optimize mineral processing processes, and provide more efficient and environmentally friendly technical solutions for global mining customers.
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