Technology for producing iron fine powder through red mud fluidized bed method

Abstract

The invention discloses a technology for producing iron fine powder through a red mud fluidized bed method, and belongs to the technical field of steel production. The technology is characterized by comprising the following steps that red mud grout is diluted and screened, and rough iron powder is obtained through a pretreatment manner of gravity sorting, magnetic sorting or gravity sorting and magnetic sorting combination; drying is conducted; the fluidization reducing reaction temperature of a reducing fluidized bed is controlled to range from 450 DEG C to 550 DEG C, gas with the volume ratio of CO+H2 being 40%-50% is used in the reducing fluidized bed to conduct the reducing reaction on the rough iron powder, the reducing reaction time is controlled to range from 8 min to 15 min, and reduced magnetized rough iron powder is obtained; and the reduced magnetized rough iron powder is ground to be smaller than 100 meshes, then, physical separation is conducted, and the iron fine powder with the grade being 61% or above is obtained. The technology can overcome the defect that during physical method red mud iron separating, the iron powder product quality is low, and energy consumptionduring chemical method red mud iron separating can be greatly reduced.

Description

technical field [0001] The invention discloses a process for producing iron concentrate powder by a red mud fluidized bed method, which belongs to the technical field of iron and steel production. Background technique [0002] Red mud is an insoluble residue discharged from alumina production. For every ton of alumina produced, about 1-1.5 tons of red mud are produced. Red mud can be divided into sintering method, Bayer method and combined method red mud from the production process, usually the main components are Fe 2 o 3 , SiO 2 , Al 2 o 3 and CaO et al. Whether it is the red mud discharged by the sintering method, the combined method or the red mud discharged by the Bayer method, they all have strong alkalinity, so they cannot be used directly. At present, my country's red mud is mainly disposed of by stockpiling, and its comprehensive utilization rate is only 4%. A large amount of red mud is piled up, which not only occupies land, wastes resources, but also easily...

AI Technical Summary

Problems solved by technology

This iron selection process mainly has the following defects: (1) The process is relatively simple, and the adaptability to red mud is poor. When the iron content in red mud fluctuates greatly, it is impossible to ensure that the iron content in iron powder products reaches the standard; (2) Due to the physical method of iron selection, the grade of iron powder products is generally low, 50-55%, and most of them are ferric oxide, so this iron powder can only be used as an ingredient in the production of low-end iron products

This iron selection process mainly has the following defects: (1) The process is simple, the high-temperature reduction of red mud is large, the efficiency is low, the energy consumption is large, and the economy is poor; (2) All the red mud is fluidized, and the red mud between The inclusion effect is significant, and the mutual influence is large, resulting in a reduction in reduction efficiency; (3) The magnetic separation intensity after reduction is high, reaching 5000-15000 Gauss, and the energy consumption is high

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