Production method of magnetite and roasting furnace for magnetite

Abstract

The invention discloses a production method of magnetite and a vertical roasting reduction furnace for the magnetite. The production method comprises the steps of with low-grade siderite, limonite, specularite, hematite and sulfuric acid residues as raw materials, controlling the pressure of the vertical roasting reduction furnace at 300-350Pa, adding a small amount of additives into mineral aggregates in proportion at reducing atmosphere, moving the mixture from a temperature layer of 1 DEG C to a temperature layer of 490-750 DEG C under the action of natural pressure, cooling, and magnetizing, so as to obtain the magnetite. The production method has the beneficial effects that the technical flow is simple, a product path for utilizing low-grade and difficultly-utilized siderite, limonite, specularite and hematite by virtue of a process technique with the advantages of energy conservation, environmental friendliness, high efficiency, low investment, land conservation, easiness in management and control, high handling capacity and high rate of certified products is utilized, and an excellent waste recycling effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of magnetite production, in particular to a production method of high-grade magnetite and a vertical roasting reduction furnace thereof. Background technique [0002] At present, coal-based rotary kiln, rotary kiln, orbital kiln and other processes are mostly used in my country to prepare iron concentrate powder by roasting siderite, limonite, specularite, and hematite. The characteristics of the rotary kiln are: large processing capacity, high production capacity, suitable for large mines to be put into use. But the disadvantages are: large investment, long construction period, powder ore is easy to stick to the furnace body, difficult to control, and high production cost. Compared with the rotary kiln, the rotary kiln has lower investment, better mobility, and is easy to install, but it is often bonded by fines from the cooling chamber to the discharge port, resulting in high maintenance rate and low yiel...

AI Technical Summary

Problems solved by technology

But the disadvantages are: large investment, long construction period, powder ore is easy to stick to the furnace body, difficult to control, and high production cost

Compared with the rotary kiln, the rotary kiln has lower investment, better mobility, and is easy to install, but the cooling chamber to the discharge port is often bonded by fines, which leads to high maintenance rate and low yield, which seriously affects production capacity.

The construction cost of orbital kiln is close to that of rotary kiln, and the temperature control is difficult. It is easy to sinter the ore into ferrous sulfate and be scrapped, especially the energy consumption is high and the labor intensity is high.

[0003] The above technologies are not easy to control because of the complex roasting environment, and the magnetic separation must be carried out immediately after discharge, otherwise the magnetic properties will be weakened and degraded quickly, and the genuine product rate often needs to be finally realized through a complicated reverse flotation beneficiation process.

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