High-effective magnetic hydrocycloning equipment for magnetite ore processing

Abstract

A new method and equipment for magnetic hydrocycloning are proposed, which make it possible to extract the magnetic fraction from a polydisperse suspension with a high specific productivity and separation efficiency without preliminary classification by size. An alternating magnetic field source is coaxially superimposed on top of the hydrocyclone so that the magnet-like lines intersect the suspension flow rotating in the cylindrical part of the hydrocyclone. In this case, the gradient of the magnetic field inside the body of the hydrocyclone is directed opposite to the direction of the summed vectors of the centrifugal force and gravitational force, and the magnetic fraction (product) is redirected through a drain tube for the concentrate outlet. It is possible to adjust the operating mode of the magnetic hydrocyclone for adjusting the total area of the outlet holes in the drain tube by moving an insert with slot-like cuts, which changes the overlap area of the holes. The magnetic hydrocyclone is recommended for processing ferruginous quartzite and other types of ores with pronounced magnetic properties. The results of the effective separation of magnetic and nonmagnetic particles at different magnetic field densities are presented, and the dependence of the magnetic fraction recovery on the size of the initial suspension feed is described. A method is proposed for estimating the possibility of extracting magnetic particles at preset parameters, for example, the geometric dimensions of the magnetic hydrocyclones at the varied values of the magnetic field density and particle flow velocity. The formula for the calculation is given, which establishes the equality, when the particle overcomes the internal space of the hydrocyclone and is extracted into the concentrate.