Gold Recovery from Flotation Tailings via Cyclone Classification
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Solution Overview
Problem
Current methods for recovering free milling gold from gold-containing ores are inefficient, particularly in processing tailings from flotation elements, leading to higher infrastructure and operating costs.
Innovation Solution
A method involving size separation of tailings streams from a flotation element using a size separation element, such as a cyclone, to produce fines and coarse streams, with the recovery of free milling gold from at least one of these streams, optimizing gold recovery while reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all tailings from flotation are sent to leach recovery, then gold recovery is maximized, but infrastructure costs and operating costs increase significantly
Solution Approach 1:
The patent divides the tailings stream into different size fractions using cyclone classification. The fine fraction (reporting to the cyclone overflow) and coarse fraction (reporting to the cyclone underflow) are separated and treated differently. This segmentation allows the process to target only the fine fraction for leach recovery, reducing infrastructure costs while maintaining gold recovery for the liberated gold particles in the fine fraction.
Solution Approach 2:
The patent applies different processing approaches to different size fractions of tailings. The fine fraction is directed to leach recovery where it is most effective, while the coarse fraction is handled differently (e.g., stockpiling or alternative processing). This local quality approach optimizes resource allocation by applying leach recovery only where it provides the best return, reducing overall infrastructure costs.
2Quantity of substance
If size separation is applied to tailings, then the amount of material requiring leach recovery is reduced, but additional processing equipment is required
Solution Approach 1:
The patent employs cyclone classifiers that utilize pneumatic and hydraulic principles to separate tailings by size. The cyclones use centrifugal force generated by rotating slurry flow to separate fine particles (reporting to overflow) from coarse particles (reporting to underflow). This approach uses readily available hydraulic/pneumatic technology to achieve size separation without requiring complex mechanical classification equipment.
3Reliability
If free milling gold deports preferentially to specific size fractions, then size separation can concentrate gold, but requires precise control of particle size distribution
Solution Approach 1:
The patent employs dynamic adjustment of cyclone operating parameters (such as feed rate, water addition, and cyclone inlet pressure) to optimize the separation of gold-bearing fine particles from coarse tailings. The system is designed to adapt to varying feed conditions while maintaining effective classification, allowing flexible control over particle size distribution without requiring overly precise static design parameters.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively increases the recovery of free milling gold, particularly cyanide-soluble gold, by concentrating it in specific size fractions, thereby reducing the amount of tailings requiring leach recovery and lowering infrastructure costs.
Implementation Method 1
processing at least a part of the tailings stream in a size separation element, such as a cyclone, and producing a fines stream and a coarse stream
Implementation Method 2
the cyanide ion forms a soluble complex ion, [Au(CN)2]− with gold
Data Source
AI summary
A method of recovering free milling gold from a gold-containing feed material that includes processing at least a part of a tailings stream from a flotation element in a size separation element and producing a fines stream and a coarse stream. The method also includes recovering free milling gold from at least one of the fines stream and the coarse stream.