Magnetic separation device and method for reducing hematite-containing material by utilizing microwave

Abstract

The invention relates to a device and a method for reducing hematite-containing materials by utilizing microwave heat treatment and carrying out magnetic separation. The device comprises a material bin, a screw feeder, a star type feeding machine, a preheating reacting furnace and a microwave magnetic separator. When the magnetic separation is carried out, the materials are crushed and then added to the material bin, powdery materials enter the preheating reacting furnace through the screw feeder and the star type feeding machine for preheating, and the preheated powdery materials enter the microwave magnetic separator through an air inlet pipe for the microwave heat treatment and the magnetic separation; products subjected to the magnetic separation are discharged through an ore discharge pipe from a discharge port, and other materials are discharged through an outlet pipe from the discharge port. The device disclosed by the invention can be used for reducing the weak magnetic Fe2O3 contained in the materials into strong magnetic Fe3O4 through the microwave heating and separating the iron ore concentrates through the magnetic separation, integrally and simultaneously carries out the reduction and the magnetic separation, has the advantages of small investment, low energy consumption, large treatment quantity, water saving, no air pollution, wide application range and relatively popularization prospect, is simple in equipment, and can be used for treating multiple hematite-containing materials which include ores, such as steel slag, low-grade limonite and iron ores.

Description

technical field [0001] The invention relates to a magnetic separation device and a magnetic separation method for separating hematite-containing materials, in particular to a device and a magnetic separation method for reducing hematite-containing materials by microwave heat treatment and performing magnetic separation. Background technique [0002] Steel slag is the waste slag produced in the steelmaking process, and the amount is about 15-20% of the steel output. In recent years, with the rapid development of my country's iron and steel industry, the discharge of steel slag has also increased. A large amount of steel slag needs a large area of ​​land to be piled up every year, which brings serious pollution to soil, water body, atmosphere, etc., and even poses a threat to people's health. However, in fact, the useful components in the steel slag account for the vast majority, as long as the harmful components in the steel slag are removed, it can be comprehensively utiliz...

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Problems solved by technology

The equipment for realizing the above method mainly includes shaft furnaces, rotary kilns and fluidized fluidized furnaces, etc., but these equipments have disadvantages such as low heat transfer coefficient and long reduction time, resulting in unqualified equipment structure and related technologies, not only poor reduction and roasting quality, but also Large, complex structure, high energy consumption, low processing capacity, large dust content in exhaust gas, complex dust collection system, and large investment

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