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Raw material suspension preheating magnetizing roasting system and process

A suspension preheating and magnetization roasting technology, which is applied in the field of metallurgy and mineral engineering, can solve the problems of unsatisfactory large-scale industrial production, unsatisfactory ore magnetization effect, and incomplete magnetization degree, so as to improve reduction efficiency, save energy and reduce emissions Significant, low-cost production effects

Pending Publication Date: 2020-12-29
CHENGDU LEEJUN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, CN101392989 discloses a suspension magnetization roaster, which roasts the ore through a roaster, resulting in insufficient or partial over-roasting of the ore, and the degree of magnetization is not complete
CN101775486 discloses a closed magnetization reduction furnace, the magnetization roasting chamber of the magnetization reduction furnace is closed, the preparation process of this structure is cumbersome, and the magnetization effect of the ore is not ideal
At the same time, the existing magnetization roasting furnace has a small volume and limited production capacity, which cannot meet the needs of large-scale industrial production

Method used

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  • Raw material suspension preheating magnetizing roasting system and process
  • Raw material suspension preheating magnetizing roasting system and process

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A raw material suspension preheating magnetization roasting system, such as figure 1 , figure 2As shown, it includes a reducing material silo 1, a reducing agent silo 9, a multi-stage suspension preheating unit, a magnetization roasting holding furnace 12, and a cooling unit. The outlets of the reducing material silo 1 and the reducing agent silo 9 are respectively connected A multi-stage suspension preheating unit, so that the raw materials are pretreated in the multi-stage suspension preheating unit and then mixed with the reducing agent; the multi-stage suspension preheating unit is connected to the feed port of the magnetization roasting and holding furnace 12, and the magnetization roasting and holding The outlet of the furnace 12 is connected with the cooling unit.

[0041] The multi-stage suspension preheating unit is composed of 3 to 5 stages of suspension preheaters, and the number of suspension preheater stages can be appropriately increased or decreased acc...

Embodiment 2

[0063] A hematite in Liaoning has a total iron content of 39.78%, of which the magnetic iron content is only 0.42%. The raw material suspension preheating magnetization roasting system in Example 1 is used to carry out magnetization roasting, the hematite is made to -200 mesh 85%, preheated to 700 ° C by the raw material suspension preheating magnetization roasting system in Example 1, and 5% coal powder is fed into the magnetized roasting and holding furnace 12 together, and the roasting time is 30 minutes; the cooling unit is cooled by water, and the flow rate of the cooling water is 2m / s, and the material is cooled to below 200°C and discharged. The final magnetic susceptibility reached 96%.

Embodiment 3

[0065] The Fe2O3 content of a high-iron bauxite in Yunnan is 22.36%. Using the raw material suspension preheating magnetization roasting system in Example 1 to carry out magnetization roasting, the bauxite is made to -200 mesh 90%, preheated to 900 ° C by the raw material suspension preheating magnetization roasting system in Example 1, and 10% coal powder is fed into the magnetized roasting and holding furnace 12 together, and the roasting time is 60 minutes; the cooling unit is cooled by water, and the flow rate of the cooling water is 2m / s, and the material is cooled to below 200°C and discharged. The final magnetic susceptibility reached 90%.

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Abstract

The invention discloses a raw material suspension preheating magnetizing roasting system and process, and relates to the technical field of metallurgy and mineral engineering. The raw material suspension preheating magnetizing roasting system comprises a reducing material bin, a reducing agent bin, a multi-stage suspension preheating unit, a magnetizing roasting holding furnace and a cooling unit.Discharge ports of the reducing material bin and the reducing agent bin are respectively connected with the multi-stage suspension preheating unit, so that raw materials are mixed with a reducing agent after being pretreated in the multi-stage suspension preheating unit. The multistage suspension preheating unit is connected with a feeding port of the magnetizing roasting holding furnace, and a discharging port of the magnetizing roasting holding furnace is connected with the cooling unit. The raw material suspension preheating magnetizing roasting system and process provided by the inventionare short in process flow, uniform in material heating, low in production cost, small in environmental pollution, high in comprehensive utilization rate, excellent in product cost performance, remarkable in energy conservation and emission reduction, wide in application range, broad in application aspects, and capable of fully using heat and reducing heat energy loss.

Description

technical field [0001] The invention relates to the technical field of metallurgy and mineral engineering, in particular to a raw material suspension preheating magnetization roasting system and process. Background technique [0002] There are a large number of low-grade iron ore resources in my country, and the iron grade of these iron ores is generally between 20% and 50%. Physical and chemical beneficiation methods are usually used for enrichment and reuse of low-grade iron ore. These beneficiation methods have problems such as low recovery rate and high recovery cost. Therefore, the utilization rate of low-grade iron ore is very low at present. [0003] Magnetization roasting is one of the effective methods for processing low-grade iron ore. It is a process of removing volatile substances in iron ore in a heated state and reducing high-priced iron to low-priced iron. The magnetization roasting process of the traditional production process is realized in the shaft kiln a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/10C22B1/26F27B15/00F27B15/18
CPCC22B1/02C22B1/10C22B1/26F27B15/00F27B15/18Y02P10/20
Inventor 何亚民丁亚卓徐智平
Owner CHENGDU LEEJUN IND
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