Dry Electrostatic Separation of Fine Iron Ore
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional technologies are ineffective in processing fine and very fine iron ores, leading to significant losses and environmental liabilities, as they are either lost as tailings or require wet processing, which is costly and environmentally risky.
Innovation Solution
A water-free process involving drying, de-agglomeration, air classification, and electrostatic separation using a belt separator system to segregate and upgrade fine and very fine iron ores, generating a high-grade iron ore concentrate without the need for water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional wet processing technologies are used to process fine and very fine iron ores, then iron recovery can be achieved, but operational costs increase and environmental risks arise
Solution Approach 1:
The patent replaces wet mechanical processing systems with a dry electrostatic separation system. Fine and very fine iron ore particles are dried and then separated using electrostatic forces between conductive iron ore particles and non-conductive gangue minerals, eliminating the need for water-consuming wet processing while maintaining effective iron recovery
Solution Approach 2:
The patent changes the physical state parameter of the iron ore from wet to dry by implementing a drying step before separation. This parameter change enables the use of electrostatic separation instead of wet processing, reducing operational costs and environmental risks while maintaining iron recovery effectiveness
2Loss of substance
If conventional technologies process fine and very fine iron ores, then iron recovery is possible, but environmental liabilities increase due to wet tailings
Solution Approach 1:
The patent replaces wet processing systems that generate environmental liabilities with a dry electrostatic separation system. The entire process operates without water, producing dry separable tailings instead of wet tailings that require impoundment, thereby eliminating the associated environmental risks while maintaining iron recovery
Solution Approach 2:
The patent changes the moisture content parameter of the processing system from wet to dry. This fundamental parameter change transforms the nature of the tailings from wet, environmentally hazardous material to dry, easily manageable waste product, eliminating environmental liabilities while preserving iron recovery
3Manufacturing precision
If magnetic separation is used for particles below 150 microns, then separation can be achieved, but non-magnetic fines are dragged along with magnetic fraction reducing selectivity
Solution Approach 1:
The patent replaces magnetic separation with electrostatic separation for fine and very fine particles. Electrostatic separation based on conductivity differences between iron ore and gangue minerals provides superior selectivity for particles below 150 microns, preventing the dragging of non-magnetic fines that occurs in magnetic separation while maximizing recovery of both magnetic and non-magnetic iron-bearing minerals
4Manufacturing precision
If electrostatic separation is applied to coarse material only, then separation efficiency is maintained, but fine and very fine iron ores below 75 microns cannot be processed
Solution Approach 1:
The patent implements a drying step that changes the moisture content parameter of fine and very fine iron ore particles before electrostatic separation. This parameter change enables the electrostatic separator to effectively process particles across a wide size range including fine (75-150 microns) and very fine (below 75 microns) particles, extending the adaptability of the process beyond conventional electrostatic separation limitations
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 process effectively recovers iron ores from fines that are otherwise unprocessable, producing a high-grade concentrate that is dry and stackable, reducing environmental risks and operational costs while maximizing iron recovery.
Implementation Method 1
A water-free process involving drying, de-agglomeration, air classification, and electrostatic separation
Implementation Method 2
air classification, and electrostatic separation using a belt separator system to segregate and upgrade fine and very fine iron ores
Implementation Method 3
electrostatic separation using a belt separator system to segregate and upgrade fine and very fine iron ores
Implementation Method 4
the belt detaches from the roll and causes the magnetic particles to detach from the belt and fall by gravity and centrifugal force into the appropriate hopper
Data Source
AI summary
Systems and methods for the beneficiation of fine and very fine particles of iron ore are disclosed. The system includes a first triboelectric electrostatic belt-type separator (BSS) which receives and processes a stream of particles with a median particle size (d50) less than 75 microns to generate an iron rich concentrate. The system and method is water-free and carried out in a totally dry metallurgical route. The system also includes at least one air classification device that receives and processes a feed stream of particles to provide the stream of particles with a median particle size (d50) that is less than 75 microns. The system may also include a dryer and de-agglomeration system that receives a feed stream of particles and processes the feed stream of particles to provide the particle stream with a moisture of less than 2%.