High-temperature powdery iron ore reduced calcine segmented cooling method

Abstract

The invention belongs to the field of metallurgy and mineral processing engineering, and relates to a high-temperature powdery iron ore reduced calcine segmented cooling method. According to the high-temperature powdery iron ore reduced calcine segmented cooling method, high-temperature powdery iron ore reduced calcine is cooled by different mediums in a multi-segment manner; mainly a coal gas cooling segment, a nitrogen cooling segment, an air cooling segment and a water cooling segment are included; coal gas is adopted as a fluidization medium for the high-temperature segment to conduct cooling; nitrogen is adopted as a fluidization medium for the medium-temperature segment and also achieves an air isolation effect, and the oxygen-free environment in a waste heat boiler is ensured; the high-temperature powdery iron ore reduced calcine exchanges heat with a medium in a boiler pipeline in the fluidized state, and a fluidization effect and a protective atmosphere are mainly achieved through the coal gas and the nitrogen; the reduced calcine makes contact with air at the low temperature to conduct aerobic cooling; the reduced calcine releases a large amount of reaction heat after making contact with the air; the coal gas and the air enter a combustion system to conduct blending combustion after being subjected to heat exchange temperature rise, and the calcination heat consumption is reduced; and the powdery reduced calcine enters water to be cooled and is subjected to pulping and subsequent sorting after the temperature is lower than 250 DEG C.

Description

[0001] structural technology [0002] The invention belongs to the field of metallurgy and mineral processing engineering, and relates to a segmental cooling method for reducing calcined sand of high-temperature powdery iron ore. Background technique [0003] my country is rich in complex refractory iron oxide ore resources, which have complex mineral composition, weak magnetism, and fine particle size. It is difficult to obtain ideal separation indicators by conventional strong magnetic separation technology. If this kind of ore is pretreated by reduction, magnetization and roasting, and then undergoes magnetic separation, reverse flotation and other processes, better separation indicators can often be obtained. [0004] The traditional magnetization roasting process includes Anshan-type shaft furnace magnetization roasting process and rotary kiln magnetization roasting process, etc. The cooling method generally adopts reducing calcined sand directly into water for cooling. ...

AI Technical Summary

Problems solved by technology

However, the current cooling method is technically unfeasible, economically unreasonable, cannot meet market demand, and cannot bring higher economic benefits to enterprises.

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