Method for manufacturing fused magnesia and pig iron by using waste magnesia carbon bricks and rolled steel sheets

Abstract

The invention relates to a method for manufacturing fused magnesia and pig iron by using waste magnesia carbon bricks and rolled steel sheets. The method comprises the steps that (1) the waste magnesia carbon bricks and the rolled steel sheets are broken to form magnesia carbon brick powder and rolled steel sheet powder respectively; (2) the magnesia carbon brick powder is mixed with the rolled steel sheet powder after water is added to the magnesia carbon brick powder to enable the magnesia carbon brick powder to be wet; (3) adhesion agents are added to enable mixed materials to be pressed so as to form iron carbon magnesium pellets; (4) the iron carbon magnesium pellets containing water are dried; (5) the iron carbon magnesium pellets and magnesite are fed into a high-capacity magnesium electrofusion furnace in a layered material distribution mode, and the iron carbon magnesium pellets serve as the first layer of raw materials; (6) the iron carbon magnesium pellets are distributed in the central region of the magnesium electrofusion furnace, and the magnesite is distributed on the periphery of the iron carbon magnesium pellets, so that the second layer of raw materials is formed by the iron carbon magnesium pellets and the magnesite together; and (7) the step (5) and the step (6) are repeatedly conducted, various layers of raw materials are distributed in sequence, refining and precipitation are conducted, and finally the fused magnesia and the pig iron are obtained. The method for manufacturing the fused magnesia and the pig iron by using the waste magnesia carbon bricks and the rolled steel sheets achieves comprehensive and efficient utilization of the industrial waste.

Description

technical field

[0001] The invention belongs to the technical field of refractory materials, in particular to a method for preparing fused magnesia and pig iron by using waste magnesia-carbon bricks and rolled steel sheets. Background technique

[0002] At present, the conventional method of producing fused magnesia is to process the raw magnesite ore into particles with a particle size of 5-40 mm, and then use an electric melting furnace for smelting production. Generally, a 1200 kVA electric furnace is used for smelting to produce fused magnesia. The production of 1 ton of fused magnesia consumes 3700-3800 degrees of electricity, consumes about 65kg of electrodes, and the production cycle is about 10 hours. After the smelting of fused magnesia is completed, let the melting machine cool down naturally. This process technology has many problems such as high energy consumption, long smelting cycle, and low utilization rate of raw materials.

[0003] At present, research at h...