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Method for producing molten iron and recovering zinc by utilizing zinc-containing dust or sludge in steelworks

A technology for iron and steel plants and dust sludge, applied in the field of iron and steel smelting waste recycling, can solve the problems of large investment, high energy consumption, poor production stability, etc., and achieve the effects of high energy efficiency, reducing pollution and avoiding enrichment.

Active Publication Date: 2014-04-23
MCC CAPITAL ENGINEERING & RESEARCH
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  • Abstract
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  • Claims
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Problems solved by technology

Some enterprises have developed processes for treating zinc-containing dust and sludge in iron and steel plants, such as rotary hearth furnace process and rotary kiln process, but each process has problems such as high energy consumption, large investment, or poor production stability to varying degrees

Method used

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  • Method for producing molten iron and recovering zinc by utilizing zinc-containing dust or sludge in steelworks
  • Method for producing molten iron and recovering zinc by utilizing zinc-containing dust or sludge in steelworks

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Embodiment 1

[0040] This embodiment provides a method for producing molten iron and reclaiming zinc by using zinc-containing dust sludge from iron and steel plants. The process flow is as follows figure 2 shown, including the following specific steps:

[0041] 1) Raw material processing and ingredients

[0042] Blast furnace gas ash and converter OG mud stored in the batching bin after drying are batched according to the mass ratio of 1:1. The main components of blast furnace gas ash and converter OG mud are shown in Table 1, and then add a binder, the binder is molasses , the amount of binder used accounts for 5wt% of the mass of zinc-containing dust (the sum of the mass of blast furnace gas ash and converter OG mud), and then adds 5 wt% of the mass of zinc-containing dust (the sum of the mass of blast furnace gas ash and converter OG mud) and) of 2wt% water, mixed uniformly on a mixer to obtain a mixed raw material.

[0043] Table 1 Main components of blast furnace gas ash and convert...

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Abstract

The invention relates to a method for producing molten iron and recovering zinc by utilizing zinc-containing dust or sludge in steelworks. The method comprises the following steps of mixing dry zinc-containing dust or sludge in steelworks with binders and water uniformly to obtain a mixed raw material; forming the mixed raw material through cold bonding to obtain pellets or fragments of bricks; sending the pellets or fragments of bricks subjected to cold bonding to a dryer or a chain grate to be dried until the water content is not more than 1wt%; mixing the dried pellets or fragments of bricks with coke and a fluxing agent to undergo reduction smelting to obtain molten iron and zinc vapor; leading coal gas containing zinc vapor out, removing coarse grain dust by utilizing a thermal cyclone dust collector, recovering the sensible heat of the coal gas by utilizing a waste heat boiler, exchanging heat with a heat exchanger, and then carrying out fine dust collection by utilizing a bag-type dust collector to obtain high zinc dust. By adopting the method provided by the invention, the environment pollution caused by solid wastes such as metallurgical dust or sludge and the like in steelworks is reduced, and simultaneously, molten iron which can be directly used for steelmaking is generated, therefore, the method has better economic and social benefits.

Description

technical field [0001] The invention relates to a method for producing molten iron and recovering zinc by utilizing zinc-containing dust sludge in iron and steel plants, and belongs to the technical field of iron and steel smelting waste recovery. Background technique [0002] In the steel production process, a lot of dust or sludge will be produced, such as blast furnace gas ash (gas mud), blast furnace dust removal dust, converter dust removal dust (OG mud), electric furnace dust removal dust, etc., among which the content of zinc is relatively high. Zinc is a trace element in blast furnace raw materials. It usually enters the blast furnace in the form of oxide or sulfide. However, due to its low reduction temperature and low boiling point of liquid zinc, it can hardly be absorbed by iron slag. [0003] If the zinc-containing dust sludge in the iron and steel production process is returned to the sintering process for use, the contained zinc will enter the blast furnace al...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B19/04C22B5/10C22B1/242
Inventor 樊波吴志宏全强姜凤山张波段国建
Owner MCC CAPITAL ENGINEERING & RESEARCH
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