high gauss mineral magnetic separator for hematite

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high gauss mineral magnetic separator for hematite

High Intensity Magnetic Separation Fundamentals

In the design of the magnetic separator, the strength and the gradient of the magnetic field are two first order variables that affect mineral response. The strength of the magnetic field or the field intensity refers to the number of lines of flux passing through a unit area. Lines of flux are measured in Gauss or Tesla . Regions of high magnetic field strength have a greater number of flux lines. The second variable is the magnetic field gradient or the rate of change of the magnetic field intensity. The most common method of producing a high gradient is to drive the lines of flux from a flat pole piece of relatively large surface area to a narrowed opposing pole piece. This necessitates the convergence of the flux lines to the closest conducting surface. An alternative method of producing a high gradient is to laminate the conducting surface with alternating magnetic and non magnetic material. In very simplified terms, the field intensity holds th...

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High Intensity Magnetic Separators are designed for either wet or dry applications. Dry separators typically consist of a magnetized rotor in which the magnetic force is opposed by centrifugal and gravitational forces. The magnetized rotor is usually grooved or laminated to produce a high gradient. Separations occur when the paramagnetic particles are deflected from the diamagnetic particle stream. Wet High Intensity Magnetic Separators incorporate a matrix which is magnetized by an externally produced magnetic field. The matrix amplifies the applied field and produces very high gradients. The feed slurry flows through the matrix which captures the paramagnetic particles while the diamagnetic particles are washed through. Two basic types of Wet High Intensity Magnetic Separators are available for commercial use. The Wet High Intensity Magnetic Separator consists of an annular ring or carrousel which contains the matrix and rotates through the open magnetized gap of the C f...

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When producing a magnetic concentrate of value, it may be desirable to operate the initial stage of separation at a relatively low speed and the second stage of separation at a considerably faster speed. At a low roll speed, a clean apatite product will be thrown from the roll with all ilmenite containing particles reporting to the magnetic fraction. Retreating the ilmenite concentrate at a high roll speed will result in the locked particles being thrown from the roll and the liberated ilmenite reporting to the magnetic fraction. This process would result in a high grade apatite and a high grade ilmenite concentrate along with a recycled middling product. Another variation of a high intensity dry magnetic separator is the lift type separator. The most common type is the Cross Belt separator. The Cross Belt separator has application in treating a mineral stream of high value at relatively low capacity. Typical applications are the concentration of monazite, columbite or tantalite o...

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Wet High Intensity Magnetic Separation and High Gradient Magnetic Separation are essentially fine particle separation techniques utilizing high intensity electromagnets and a flux converging matrix to generate regions of high field strengths and magnetic gradient. Technically WHIMS is distinquished from HGMS by the direction of slurry flow being perpendicular to the lines of magnetic flux rather than parallel . For a typical application, the characteristic matrix size, , and magnetization are established by matrix selection leaving flow velocity and applied field as major independent variables. In most WHIMS designs, flow is by gravity and cannot be directly controlled while HGMS typically operates with the feed slurry pumped to the canister at a predetermined rate which can be advantageous. The largest particle size also effects the choice of matrix since particles must be able to physically pass th...

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