Liaoning 450t/d Gold Processing Plant

Project Overview

This project involves the reconstruction and expansion of a gold processing plant in Liaoning Province, China. Originally commissioned in 1991 and expanded to 250t/d, the plant requires upgrades to enhance throughput and economic performance. The ore is low-sulfide gold-bearing, primarily containing pyrite. The original full-slime cyanidation process achieved a gold leaching rate of about 96%. An optimized flowsheet combining flotation with cyanidation was selected based on investigations and testing.

Xinhai Solution

• Process Evaluation and Scheme Selection: Multiple options were evaluated through testing and economic analysis. The combined flotation–cyanidation scheme was selected as the best solution, balancing investment, operating costs, recovery, and construction time.
• Crushing, Grinding, and Flotation Integration: A new grinding and flotation system was implemented to enhance plant capacity, featuring two-stage grinding and flotation to recover gold-bearing minerals. The flotation concentrate is then thickened, filtered, and reground before entering the cyanidation process.
• Cyanidation System Optimization: The existing 250t/d cyanidation circuit was retained for both run-of-mine slurry and reground flotation concentrate, improving system efficiency and maximizing infrastructure use.
• Tailings Detoxification Upgrade: The tailings treatment system was upgraded with an alkaline chlorination process and additional agitation tanks to ensure effective cyanide destruction and compliance with discharge standards.
  

Major Equipment

Project Achievements

The project was completed with minimal disruption to existing operations and achieved the target expanded capacity. The optimized flowsheet improves overall resource utilization by integrating flotation with the existing cyanidation system, while the upgraded detoxification system ensures compliant and environmentally responsible operation.

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