Treatment method of rotary hearth furnace metallized pellet undersize powder

Abstract

The invention discloses a treatment method of rotary hearth furnace metallized pellet undersize powder. The rotary hearth furnace metallized pellet undersize powder is mixed with other metallurgical solid waste to prepare pellets which are used as raw materials of a steelmaking converter. The raw materials meeting the use requirements of the steelmaking converter are produced by selecting the raw materials for proportioning and processing, and the method has the characteristics of stable components, low production line investment, low production cost and the like.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting waste utilization, in particular to a method for treating the metallized pellet undersize of a rotary hearth furnace. Background technique [0002] At present, the commonly used method in the world is to use the rotary kiln or rotary hearth furnace device to make the above metallurgical dust into pellets, and then recover the zinc after being reduced under high temperature reduction conditions, and return the dezincified metallized pellets to the blast furnace or converter for use. , zinc powder is exported to zinc deep-processing enterprises, but due to insufficient reaction of metallized pellets, the zinc content is too high, between 1% and 2.5%. Back-sintering has a great impact on blast furnace production, and direct steelmaking cannot For effective use, most of them are stored in the factory or mixed into sintering raw materials in a small proportion, which not only occupies l...

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Problems solved by technology

[0002] At present, the commonly used method in the world is to use the rotary kiln or rotary hearth furnace device to make the above metallurgical dust into pellets, and then recover the zinc after being reduced under high temperature reduction conditions, and return the dezincified metallized pellets to the blast furnace or converter for use. , zinc powder is exported to zinc deep-processing enterprises, but due to insufficient reaction of metallized pellets, the zinc content is too high, between 1% and 2.5%. Back-sintering has a great impact on blast furnace production, and direct steelmaking cannot For effective use, most of them are stored in the factory or mixed into sintering raw materials in a small proportion, which not only occupies land resources but also brings certain risks to the environment. At the same time, it will affect the stability of the blast furnace when used in sintering. The comprehensive treatment and efficient utilization of pellet under-sieve powder is an urgent problem to be solved in the industry

[0003] Some steel mills also use part of the metallurgical dust to make cold solidified pellets and add them to the converter, but the iron content in the cold solidified pellets is not high, and most of them are oxidized It exists in the state of substance, the amount of addition is not large and affects the output of the converter, and the use is more restricted

When the metallized pellet under-sieve powder is directly added to the converter, the use efficiency is low, and the under-sieve powder contains high zinc elements. When the converter is in use, most of it will enter the dust collector, which will easily cause problems such as blockage of the dust collector pipe.

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