Process for efficiently processing zinc-containing iron metallurgical dust sludge in rotary hearth furnace

A metallurgical dust sludge and rotary hearth furnace technology, which is applied in the field of iron and steel metallurgy and comprehensive utilization of secondary resources, can solve the problems of low production efficiency and thin material layer, achieve the effects of increasing calorific value, overcoming inability to desulfurize, and improving adaptability

Active Publication Date: 2019-10-08
广西锐异资源循环工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention heats and ignites the pellets of zinc-containing iron metallurgical dust and mud before entering the rotary hearth furnace, and completes three processes of drying, preheating, and igniting fuel on the moving bed, thereby improving the efficiency of the pellets entering the rotary hearth furnace. The temperature of the furnace keeps the fuel in the pellets in the initial combustion state, which can make the pellets heat up and reduce rapidly in the rotary hearth furnace, so as to overcome the thin material layer and low production efficiency caused by radiation heat transfer in the traditional rotary hearth furnace process The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]A method for efficiently treating metallurgical dust in a rotary hearth furnace is to pellet the zinc-containing metallurgical dust with a disc pelletizer, add a chain grate before the rotary hearth furnace treatment, and distribute the pellets on the chain grate. The layer thickness is 150mm, and the grate machine is divided into three stages: drying section, preheating section and fuel ignition section. The hot gas in the drying section comes from the fuel ignition section, and the hot waste gas from the fuel ignition section is mixed with some cold air to make the temperature 300°C, and returns to the drying section to dry the pellets for 6 minutes; the rotary hearth furnace gas The 600°C hot air obtained by heat exchange is introduced into the preheating section on the grate to preheat the pellets, and the preheating time is 5 minutes; part of the hot air obtained from the secondary combustion of the rotary hearth furnace gas is introduced into the grate for fuel igni...

Embodiment 2

[0036] A method for efficiently treating metallurgical dust in a rotary hearth furnace is to pellet the zinc-containing metallurgical dust with a disc pelletizer, add a chain grate before the rotary hearth furnace treatment, and distribute the pellets on the chain grate. The layer thickness is 300mm, and the grate machine is divided into three stages: drying section, preheating section and fuel ignition section. The hot gas in the drying section comes from the fuel ignition section, and the hot exhaust gas from the fuel ignition section is mixed with some cold air to make the temperature 450°C, and returns to the drying section to dry the pellets for 3 minutes; the rotary hearth furnace gas The 800°C hot air obtained by heat exchange is introduced into the preheating section of the grate to preheat the pellets, and the preheating time is 8 minutes; part of the hot air obtained from the secondary combustion of the rotary hearth furnace gas is introduced into the grate for fuel i...

Embodiment 3

[0038] A method for efficiently treating metallurgical dust in a rotary hearth furnace is to pellet the zinc-containing metallurgical dust with a disc pelletizer, add a chain grate before the rotary hearth furnace treatment, and distribute the pellets on the chain grate. The layer thickness is 200mm, and the grate machine is divided into three stages: drying section, preheating section and fuel ignition section. The hot air in the drying section comes from the fuel ignition section, and the hot exhaust gas from the fuel ignition section is mixed with part of the cold air to make the temperature 400°C, and returns to the drying section to dry the pellets. The drying time is 4.5 minutes; the rotary hearth furnace The 700°C hot air obtained by gas heat exchange is introduced into the preheating section on the grate to preheat the pellets, and the preheating time is 6.5 minutes; part of the hot air obtained from the secondary combustion of the rotary hearth furnace gas is introduce...

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Abstract

The invention discloses a process for efficiently processing zinc-containing iron metallurgical dust sludge in a rotary hearth furnace. A pellet material made of zinc-containing iron metallurgy dust sludge or mineral is placed on a moving bed for drying treatment, pre-heat treatment and fuel igniting treatment in sequence, the pellet material is preheated by introducing hot air generated by heat exchange of the rotary hearth furnace gas, the hot air generated by secondary combustion of the rotary hearth furnace gas is introduced to perform the fuel igniting treatment on the pellet material, and the waste gas generated by the fuel igniting treatment is used for pellet drying; the pellet material after the fuel igniting treatment is transferred into the rotary hearth furnace and directly enters a reduction stage, and zinc is collected, condensed and recycled from the flue gas. The process overcomes the problem of thin material and low production efficiency caused by heat transfer throughradiation of a traditional rotary hearth furnace process, realizes recycling of gas resources, reduces energy consumption and secondary pollution, and efficiently cleans the zinc-containing iron metallurgical dust sludge in the rotary hearth furnace.

Description

technical field [0001] The present invention relates to a treatment method for zinc-containing iron metallurgical dust or minerals, in particular to a process for efficiently treating zinc-containing iron metallurgical dust or minerals with a rotary hearth furnace, volatilizing and recovering zinc and obtaining iron-making raw materials, belonging to iron and steel metallurgy field and the field of comprehensive utilization of secondary resources. Background technique [0002] Zinc-containing iron metallurgical dust comes from a wide range of sources, and the amount produced in industrial production is relatively large. As a secondary resource, its disposal and comprehensive utilization methods have received more and more attention. At present, the comprehensive utilization processes of zinc-containing iron metallurgical dust and sludge mainly include: direct reduction method, leaching method, used to prepare materials, etc. The direct reduction method can obtain high iron ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/20C22B19/20C22B19/30C21B13/00
CPCC21B13/00C22B1/205C22B7/001C22B19/20C22B19/30Y02P10/20
Inventor 范晓慧甘敏吕薇陈许玲季志云黄晓贤袁礼顺汪国靖朱渊方天任
Owner 广西锐异资源循环工程技术有限公司
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