Uranium Removal from Copper Concentrate via Magnetic Separation
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Solution Overview
Problem
Current magnetic separation techniques are inefficient in reducing uranium content in copper concentrates to commercially acceptable levels, as uranium minerals tend to associate with chalcopyrite, leading to high uranium retention in flotation concentrates.
Innovation Solution
Implementing a process that combines wet high-intensity magnetic separation (WHIMS) with flotation circuits to separate uranium from copper concentrates, involving multiple stages of grinding and re-grinding to optimize mineral liberation and subsequent magnetic separation to reduce uranium content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional magnetic separation techniques are used, then the process is simple, but uranium content cannot be reduced to commercially acceptable levels due to association with chalcopyrite
Solution Approach 1:
The process segments the uranium removal into multiple distinct stages: initial flotation to separate copper minerals, followed by magnetic separation to remove uranium-bearing minerals, and optional re-grinding with additional flotation. This multi-stage segmentation allows each process to target specific mineral associations, achieving commercially acceptable uranium levels that cannot be obtained through single-stage separation.
Solution Approach 2:
The flotation circuit performs preliminary separation of copper minerals from gangue before magnetic separation. This preliminary action liberates uranium-bearing minerals from chalcopyrite associations, making them accessible to subsequent magnetic separation. The preliminary flotation reduces the complexity burden on the magnetic separation stage, allowing it to focus specifically on removing uranium-bearing minerals.
2Manufacturing precision
If multiple grinding and separation stages are implemented, then uranium removal efficiency improves, but processing time and operational complexity increase
Solution Approach 1:
The process maintains continuous operation through closed-circuit configurations where tailings from one stage become feed for the next. The flotation circuit operates continuously with reground material fed back into the system, and magnetic separation continuously processes flotation concentrate. This continuity eliminates idle time between stages and ensures constant progress toward uranium removal, reducing total processing time despite multiple stages.
Solution Approach 2:
The process applies partial grinding and separation stages only when necessary to achieve target uranium levels. If initial flotation-magnetic separation achieves acceptable uranium content, additional re-grinding and flotation stages can be omitted. This partial action approach avoids unnecessary processing time while ensuring uranium removal efficiency when required by commercial specifications.
3Manufacturing precision
If wet high-intensity magnetic separation is used, then uranium separation improves, but capital cost increases
Solution Approach 1:
The process merges wet high-intensity magnetic separation with conventional flotation circuits to achieve uranium-copper separation. By combining these two separation mechanisms, the system leverages the strengths of each: flotation handles bulk copper mineral separation while magnetic separation targets uranium-bearing minerals. This merging allows the use of WHIMS technology without bearing its full capital cost burden alone, as it supplements rather than replaces conventional flotation infrastructure.
Solution Approach 2:
The process optimizes operational parameters of magnetic separation to achieve effective uranium removal at moderate capital investment. By adjusting magnetic field intensity, feed particle size distribution, and slurry characteristics, the system maximizes separation efficiency within the constraints of available technology. These parameter changes allow effective use of WHIMS without requiring the most expensive high-capacity units, reducing capital cost while maintaining separation selectivity.
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
The process effectively decreases uranium content in copper concentrates by 46 ppm, achieving higher copper recovery and selectivity, while minimizing waste generation and chemical reagent usage.
Implementation Method 1
magnetic separation with the aim of reducing the content of uranium in a copper concentrate
Implementation Method 2
the magnetic susceptibility of minerals as in a function of magnetic field strength
Implementation Method 3
flotation circuits to separate uranium from copper concentrates
Data Source
AI summary
The present invention describes a process for removing uranium from a copper concentrate by magnetic separation (low and high field) aiming the reduction of the content of uranium in a copper concentrate to commercially acceptable levels.