Magnetic Roller Separator With Random Permanent Magnets
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Solution Overview
Problem
Current magnetic separators are not versatile enough to efficiently separate nonmagnetic or weakly paramagnetic ores, as they require complex installations and mechanical cleaning methods, and struggle with the separation of fine particles with low magnetic properties.
Innovation Solution
A magnetic separator with a metal traction roller covered by randomly distributed permanent magnets, where the magnetic axes are perpendicular to the radial axis, and partially coated with nonmagnetic plastic, generating high magnetic induction and centrifugal force for efficient separation of nonmagnetic, moderately paramagnetic, and weakly paramagnetic particles without the need for complex pole orientation or mechanical cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If magnets are placed only on a fraction of the magnetic roller circumference, then the separation is simplified, but mechanical cleaning equipment is required to remove attached particles
Solution Approach 1:
The magnetic roller circumference is divided into multiple magnetic zones with different magnetic field strengths. The first magnetic zone has higher magnetic field strength for attracting weakly magnetic particles, while the second magnetic zone has lower magnetic field strength for allowing particles to detach. This segmentation eliminates the need for mechanical cleaning equipment while maintaining simple magnet installation.
2Productivity
If magnets are placed along the entire circumference of the magnetic roller, then all particles can be attracted, but the separation efficiency for weakly magnetic particles decreases
Solution Approach 1:
Different zones of the magnetic roller are assigned different magnetic field strengths tailored to specific separation requirements. The first magnetic zone uses stronger magnetic fields to attract weakly magnetic particles, while the second magnetic zone uses weaker fields to enable their detachment. This local differentiation optimizes separation efficiency for weakly magnetic particles while maintaining high productivity.
3Ease of manufacture
If permanent magnets are used with fixed pole orientation, then installation is simplified, but adaptability to different separation parameters is reduced
Solution Approach 1:
The magnetic roller is designed with the ability to adjust the rotation speed and the positioning of magnetic zones dynamically. This allows the system to adapt to different separation parameters and material characteristics without requiring complex reconfiguration of the magnet installation. The dynamic adjustment maintains ease of manufacture while significantly improving adaptability.
4Force
If magnets with high magnetic field strength are used, then weakly magnetic particles are attracted effectively, but the detachment of particles becomes difficult
Solution Approach 1:
The magnetic roller creates periodic variations in magnetic field strength as particles pass through different zones. In the first magnetic zone, strong magnetic fields attract weakly magnetic particles. As the roller continues rotating, particles enter the second magnetic zone with weaker fields, enabling periodic detachment. This periodic action maintains strong attraction when needed while facilitating easy detachment at appropriate times.
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 configuration allows for effective separation and concentration of minerals like apatite from actinolite, with reduced mechanical cleaning needs and operational versatility, achieving high separation efficiency by controlling the rotation speed and magnetic forces.
Implementation Method 1
permanent magnets, whose magnetic axes are perpendicular to the radial axis of the metal traction roller... generating high magnetic induction
Implementation Method 2
the magnetic force exercised by a magnet to the latter is very low or mostly weak in comparison with magnetic minerals as is the case of Iron
Implementation Method 3
the action of the angular speed of the traction roller, bring about the separation of this type of ore... the traction roller transfers a centrifugal force to said particle
Data Source
AI summary
Since Thomas Edison invented the magnetic roller separator for concentrating nickel mineral, drum and roller type separators have become the most common magnetic separators. These devices can be constructed with permanent magnets or with electromagnets, and the drum separator can operate with a dry or wet supply. However, still today, strongly magnetic material detaching from the roller is a problem that has been tried to be resolved by introducing the magnets inside the cylinders, in only one area thereof, in such a way that when the material is rotated on the cylinder and moves away from the magnetised area, it falls as a result of gravity. This system has a highly complex structure. The invention uses novel and powerful, very small neodymium magnets to cover the entire surface of the roller. In this way, a small device with a larger yield is produced in a very simple and economic manner. The particulate material to be separated is supplied over a plastic piece covering the magnetic roller that is in contact with same only over a fraction of the circumference, such that when the plastic piece moves away from the magnetic roller, the material falls as a result of gravity and is separated from the rest by means of a deflector.