Technological Process Analysis of All-slime Cyanidation Applied in Tanzania Gold Processing Project

Gold extraction technology determines the final recovery benefit of mineral resources, and matching targeted technological flow according to actual ore condition is the core premise of stable mine production. The 1200t/d gold processing plant project in Tanzania takes mixed sulfide and oxide gold ore as processing objects, and selects all-slime cyanidation gold extraction technology as the core separation method. With the coordinated operation of crushing, grinding classification, cyanidation separation and tailings treatment processes, the project achieves ideal gold leaching effect, and the complete technological design provides valuable reference experience for similar mixed gold ore processing mines.

As an overseas EPC+M+O overall contracting project, this gold plant undertakes the daily processing task of 1200 tons of raw ore. The complex ore composition is the biggest difficulty faced by process design. The mining area ore is mixed with sulfide ore and oxide ore, with respective gold grade of 10.7g/t and 2.4g/t. Component detection results show that gold is the only valuable recyclable element in the ore, without associated beneficial minerals. Two kinds of ore differ greatly in leaching difficulty, traditional single separation process cannot take into account the recovery effect of both ores at the same time, which is easy to cause resource loss and low production efficiency.
After multiple mineral processing tests and technical comparison, Xinhai technical team confirmed that all-slime cyanidation process is the most suitable processing scheme for this ore. This technology has strong adaptability to mixed gold ore, can fully react with gold elements in different ore properties, and effectively improve the comprehensive leaching rate. In formal production, the leaching rate of sulfide ore reaches 93.75%, and oxide ore leaching rate reaches 91.58%. The balanced and high recovery index proves the scientificity and practicability of the selected process.
The complete technological flow of the project is divided into four interrelated functional sections, each process parameter is precisely designed and matched to ensure smooth connection of production links. Open-circuit crushing is arranged in the initial processing stage, which is responsible for breaking massive raw ore into small particles that meet feeding standard. Stable crushing effect eliminates large ore blocks that hinder grinding work, and lays uniform raw material foundation for subsequent fine processing.
Closed-circuit grinding and cyclone classification system is the key procedure to adjust ore fineness. Different from one-time grinding mode, closed-circuit grinding can circularly process unqualified ore particles, and cyclone classification equipment screens fine ore slurry accurately. Only particles reaching leaching fineness standard can enter the next procedure, and coarse particles will be sent back for re-grinding. Strict fineness control is the key factor to improve gold leaching reaction efficiency and avoid incomplete metal separation.
All-slime cyanidation separation stage is the core link of gold extraction. Fully mixed ore slurry carries out sufficient chemical reaction in leaching equipment, gold elements are separated from ore matrix and adsorbed on activated carbon to form gold-bearing carbon materials. The adsorbed gold-bearing carbon is conveyed into desorption electrolysis system, through professional electrolysis technology, gold is completely separated from carbon carrier and concentrated into high-purity gold slime. High-quality gold finished products can be obtained after simple smelting processing, realizing effective transformation from raw ore to valuable metal products.
The tailings treatment link reflects the standardized and environmental protection concept of modern mining. Residual waste slurry after gold extraction cannot be discharged arbitrarily. The project sets up special thickening and dewatering facilities to conduct solid-liquid separation and moisture reduction treatment on tailings. Treated dry tailings are stacked in fixed area in a standardized way, which not only keeps the production site clean and tidy, but also effectively avoids environmental pollution problems caused by waste residue discharge.
The smooth operation of the whole technological process is inseparable from comprehensive project construction guarantee. Before construction starts, Xinhai completed systematic planning in project management, construction technology, material supply and multi-party coordination, and sorted out all possible hidden troubles in advance. During construction, aiming at the shortage of materials, machines and technical workers in remote areas, the team adopted flexible adjustment schemes to guarantee construction resources supply.
Aiming at the thin steel equipment widely used in the production line, targeted anti-deformation protection measures were adopted in hoisting and transportation work. The external force damage of precision equipment is avoided to the maximum extent, and all equipment is installed in place with complete performance. Reliable construction quality ensures that each technological procedure can operate according to design parameters, and finally makes the all-slime cyanidation process exert optimal production effect, creating stable production value for the Tanzania gold mine project.

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