Vertical Ring Magnetic Separator De-Ironing Coal Ash
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Solution Overview
Problem
Existing vertical ring magnetic separators are inefficient in removing iron impurities from coal ash with low iron content due to large spacing between magnetic media and gravity-induced penetration of iron-containing minerals, leading to unsatisfactory de-ironing effects.
Innovation Solution
A vertical ring magnetic separator with a rotating ring, inductive medium of steel plate meshes, upper and lower iron yokes, magnetic exciting coil, and a water washing device, which generates a strong magnetic field and uses a pulsating mechanism to improve iron removal efficiency, along with a method involving repeated magnetic separation and pressure-filtering to achieve higher purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional vertical ring magnetic separators with large spacing between magnetic media are used, then iron ore selection is effective, but small granularity particles with weak magnetism pass through the media without adsorption
Solution Approach 1:
The magnetic media is segmented into multiple layers of steel wire meshes with different mesh sizes (first layer: 5-10mm, second layer: 2-5mm, third layer: 1-3mm). This segmentation creates progressively smaller spacing between magnetic media surfaces, enabling effective capture of particles across different size ranges while maintaining high iron removal efficiency without particles passing through untreated
Solution Approach 2:
The invention transitions from traditional rod-shaped magnetic media to a multi-layer mesh structure that adds dimensional complexity. The mesh layers create a three-dimensional magnetic field distribution with varying spacing in different directions, allowing particles of different sizes to be captured at different layers based on their dimensions and magnetic properties
2Ease of operation
If upper portion feeding is employed, then material flow is simple, but iron-containing minerals penetrate through the media under gravity rather than being adsorbed
Solution Approach 1:
The feeding position is inverted from the traditional upper portion to the lower portion of the rotating ring. This inversion changes the gravity vector's relationship with the magnetic field, causing iron-containing minerals to be forced against the magnetic media layers where they can be effectively adsorbed rather than penetrating through due to gravity
Solution Approach 2:
The feeding position parameter is changed from upper to lower portion, which fundamentally alters the interaction between gravity and magnetic forces. This parameter change enables the magnetic field to dominate the adsorption process while gravity assists in pressing particles against the media rather than pulling them through
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 solution significantly improves the removal efficiency of iron impurities by at least 20% compared to traditional methods, enhancing the purity of coal ash and reducing production costs.
Implementation Method 1
the magnetic exciting coil is arranged at the periphery of the upper iron yoke and the lower iron yoke so as to make the upper iron yoke and the lower iron yoke to be a pair of magnetic poles for generating a magnetic field in the vertical direction
Implementation Method 2
the inductive medium is arranged in the rotating ring... the edges of the wires have prismatic sharp angles
Data Source
AI summary
A vertical ring magnetic separator for de-ironing of coal ash comprises a rotating ring (101), an inductive medium (102), an upper iron yoke (103), a lower iron yoke (104), a magnetic exciting coil (105), a feeding opening (106), a tailing bucket (107) and a water washing device (109). The feeding opening (106) is used for feeding the coal ash to be de-ironed, and the tailing bucket (107) is used for discharging the non-magnetic particles after de-ironing. The upper iron yoke (103) and the lower iron yoke (104) are respectively arranged at the inner and outer sides of the lower portion of the rotating ring (101). The water washing device (109) is arranged above the rotating ring (101). The inductive medium (102) is arranged in the rotating ring (101). The magnetic exciting coil (105) is arranged at the periphery of the upper iron yoke (103) and the lower iron yoke (104) so as to make the upper iron yoke (103) and the lower iron yoke (104) to be a pair of magnetic poles for generating a magnetic field in the vertical direction, wherein the inductive medium (102) is layers of steel plate meshes, each steel plate mesh is woven by wires, and ridge-shape sharp corners are formed at the edges of the wires. A method for magnetically separating and de-ironing of coal ash, utilizes the vertical ring magnetic separator for de-ironing of coal ash. By adopting the vertical ring magnetic separator and the method of magnetic separation for de-ironing, the de-ironing efficiency is improved by at least 20%.