Variable magnetic field classification magnetic separator

Abstract

Then invention discloses a variable magnetic field classification magnetic separator, is applicable to the mineral separation and purification of wet type mineral powder materials, and provides a variable magnetic field classification magnetic separator by which grades of active ingredients in magnetic materials are improved and other non-magnetic ingredients in the magnetic materials are effectively separated. The magnetic separator comprises a shell with a feed inlet and at least two discharge outlets, wherein a magnetic yoke shaft with magnetic blocks, and a magnetic roller with a rotary sleeve are arranged in the shell; the feed inlet is formed in the front end of the shell; the magnetic blocks arranged on the magnetic yoke shaft are distributed on the periphery of the magnetic yoke shaft; the magnetic field intensity of the outer surface of the rotary sleeve is reduced along the axis direction from the front end to the rear end; the outer surface of the rotary sleeve is provided with an axial propelling device from the front end to the rear end; and the discharge outlets are formed in the lower part of the shell and at least two discharge holes are formed along the axis direction. By the magnetic separator, substances with different magnetic induction coefficients in a selected mineral can be separated, and a magnetic separation effect and economic benefits are improved.

Description

technical field [0001] The invention relates to a magnetic separator used in mineral separation, in particular to a magnetic separator suitable for the separation and purification of wet powder mineral materials. Background technique [0002] The magnetic separator is suitable for wet magnetic separation of magnetite, pyrrhotite, roasted ore, ilmenite and other materials with a particle size of less than 3mm, and is also used for iron removal of coal, non-metallic ores, building materials and other materials. The magnetic system of the magnetic separator is made of high-quality ferrite material or compounded with rare earth magnetic steel. The average magnetic induction intensity of the cylinder surface is 60-600mT. According to the needs of users, various types of magnetic separation with different surface strengths such as downstream, semi-countercurrent and countercurrent types can be provided. The equipment has the advantages of simple structure, large processing capaci...

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Problems solved by technology

[0004] 1. Since the magnetic block installed on the yoke shaft is only set at the lower section, during the magnetic separation process, the rotating sleeve rotates once, the effective adsorption time of the magnetic material is short, and the number of turnovers on the magnetic roller is small. The phenomenon of magnetic wrapping and non-magnetic wrapping is serious, and it is difficult to achieve the expected effect of magnetic separation

[0005] 2. Since the magnetic field strength of the magnetic blocks installed on the yoke shaft is the same, the magnetic separation effect is poor for minerals containing different magnetic materials and complex components due to the different magnetic induction coefficients of the selected materials.

[0006] Due to the above shortcomings, in the Panzhihua area of ​​my country, during the magnetic separation process of its vanadium-titanium magnetite, due to the TiO 2 The grade of iron is relatively high. Using the existing magnetic separator, the grade of iron in the final product can only reach about 54%, and the content of titanium dioxide is higher than 12%.

In the smelting process, if the iron grade is low, the coke ratio will increase and the utilization coefficient of the blast furnace will decrease. When TiO 2 When the grade exceeds 8~9%, the blast furnace cannot adopt ordinary normal smelting, and ordinary iron concentrate must be added to reduce titanium before smelting. Therefore, in the magnetic separation process, we are currently looking for a suitable process and equipment to increase Fe content, reduce Ti content

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