Microwave roasting dry type wind magnetic selection method for hematite powder

Abstract

The invention relates to a method of microwave roasting dry wind magnetic separation of hematite powder, which is a technology of rotary microwave oven roasting, dry wind magnetic separation and mineral processing and purification adopted to solve the deficiencies of wet mineral separation. The collected hematite powder, along with anthracite powder and under the condition of water-free, is crushed, finely ground, sieved, mixed, stirred, carbon reduced and roasted in a microwave oven at 700DEG C, and finally powder is obtained; afterwards, with the processes of cooling, fine grinding and magnetic separation, the hematite powder with high iron content and high purity is obtained. The method of roasting and wind magnetic separation does not require water washing and filtration, which is characterized by water saving and environmental protection. The method is in particular suitable for mineral dressing of the mining area without water source featuring short process flow, wherein microwave oven roasting, computer-controlled combined type dry wind magnetic separator, liquid crystal display, and sensor for displaying temperature information are clean beneficiation technologies. The method can bring 93-95 percentage yield rate and manufacture the powder with 71 percent iron content. The method can also be used for beneficiation of limonite and siderite.

Description

technical field [0001] The invention relates to a method for microwave roasting and dry wind magnetic separation of hematite powder, which belongs to the technical field of ferrous metal-iron ore beneficiation. Background technique [0002] At present, my country is a big steel producing country in the world. Due to the requirements of smelting production, a large amount of raw material for steel smelting - iron ore is needed. [0003] my country's iron ore reserves are relatively rich and widely distributed. The types of iron ore used include magnetite, hematite, limonite, siderite, etc. Although the currently mined hematite, limonite, The amount of siderite is increasing day by day, but most of them are of low grade, weak magnetism, fine intercalated particle size, and many intergrowth components. Silica SiO 2 , Al 2 o 3 Due to the similar physical and chemical properties, density and specific magnetic susceptibility coefficient of hematite and gangue minerals, it brings...

AI Technical Summary

Problems solved by technology

[0003] my country's iron ore reserves are relatively rich and widely distributed. The types of iron ore used include magnetite, hematite, limonite, siderite, etc. Although the currently mined hematite, limonite, The amount of siderite is increasing day by day, but most of them are of low grade, weak magnetism, fine intercalated particle size, and many intergrowth components. Silica SiO 2 , Al 2 o 3 Due to the similar physical and chemical properties, density and specific magnetic susceptibility coefficient of hematite and gangue minerals, it brings great difficulties to ore dressing, and it is difficult to screen and separate. Due to the mixing of ore and gangue, it is difficult to select , using conventional beneficiation methods, it is difficult to effectively separate hematite and gangue, which brings great difficulties to iron smelting

[0004] In addition, most of the hematite ore storage areas are in water-scarce areas, and it is difficult to carry out wet magnetic separation or water flotation for the reduced and magnetized hematite powder, which consumes a lot of water. Processing brings great difficulties, resulting in lower grade of hematite ore, higher cost of smelting iron ore, lower iron tapping rate and other disadvantages, and directly affects the quality and impurity content of iron after smelting

Images