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System and method for resource utilization of dust and sludge containing iron and zinc

A recycling and dust sludge technology, applied in the fields of metallurgy and energy, can solve the problems of poor applicability and stability of complex raw materials, high requirements for dry and wet pellet strength, high production and use costs, and achieve improved dry and wet strength and thermal stability performance, reduce pulverization rate, and reduce energy consumption

Pending Publication Date: 2022-07-22
宝武集团环境资源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, most domestic rotary hearth furnace production bases use ordinary single inorganic or organic additives. Although this kind of ordinary additive can achieve the above goals, it has poor applicability and stability to complex raw materials, high addition ratio, and high production and use costs. Problems such as low production efficiency caused by high and high return rate
In addition, the existing domestic rotary hearth furnace production line has problems such as large drop, long process, and large production load, and has high requirements for the strength of dry and wet pellets

Method used

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  • System and method for resource utilization of dust and sludge containing iron and zinc
  • System and method for resource utilization of dust and sludge containing iron and zinc
  • System and method for resource utilization of dust and sludge containing iron and zinc

Examples

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Effect test

Embodiment 1

[0069] In this embodiment, the iron-containing zinc dust sludge resource utilization system of the present invention is used to process the iron-containing zinc dust sludge, wherein the maintenance and drying equipment adopts Figure 4 Transit curing bin and dryer shown.

[0070] As shown in Table 1, 14.7wt% of blast furnace ironmaking bag ash (blast furnace ash) in A steel plant, 30.5wt% of OG-LT mixed ash of converter steelmaking, 32.3wt% of OG-electric furnace mixed ash of electric furnace steelmaking, 5.5wt% of internal dust, 1.8wt% of cold rolling mud, 3.7wt% of coking plant dust removal raw material (CDQ powder), 2.3wt% of DB-4 type composite binder as binder. In DB-4 type composite binder, sodium-based bentonite is 30wt%, pregelatinized starch is 40wt%, and DB-X type base material is 30wt%; the pregelatinized starch can be pregelatinized corn starch or pregelatinized tapioca starch; DB-X type base material is mainly composed of sodium humate, solid sodium silicate, car...

Embodiment 2

[0081] In this embodiment, the iron-containing zinc dust sludge resource utilization system of the present invention is used to process the iron-containing zinc dust sludge, wherein the maintenance and drying equipment adopts Figure 4 Transit curing bin and dryer shown.

[0082] As shown in Table 3, with 26wt% blast furnace ironmaking bag ash (blast furnace secondary ash), 51.9wt% converter steelmaking OG mud, 20wt% internal dust removal ash (environmental ash) in B steel plant, 1.9% DB-4 type composite binder is an additive. The DB-4 type composite binder contains 40wt% sodium bentonite, 40wt% pregelatinized starch and 20wt% DB-X type base material; the pregelatinized starch can be pregelatinized corn starch or pregelatinized tapioca starch; DB-X type base material is mainly composed of sodium humate, solid sodium silicate, carboxymethyl cellulose and sodium polyacrylate. The raw materials are digested, dried and other pretreatments, mixed with DB-4 type composite binder, ...

Embodiment 3

[0093] In the present embodiment, the iron-containing zinc dust sludge resource utilization system of the present invention is used to process the iron-containing zinc dust sludge, wherein the maintenance and drying equipment adopts such as Figure 5 Air drying and turning unit shown.

[0094] As shown in Table 5, with 14wt% blast furnace ironmaking bag ash (blast furnace ash), 66.2wt% converter steelmaking OG-LT mixed ash, 16wt% internal dust removal ash (environmental ash), 2wt% Coking plant dust removal raw material (CDQ), with 1.8wt% DB-4 type composite binder as additive. The DB-4 type composite binder contains 40wt% sodium bentonite, 50wt% pregelatinized starch and 10wt% DB-X type base material; the pregelatinized starch can be pregelatinized corn starch or pregelatinized tapioca starch; DB-X type base material is mainly composed of sodium humate, solid sodium silicate, carboxymethyl cellulose and sodium polyacrylate. The raw materials are fully mixed with DB-4 type co...

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Abstract

The invention discloses a system and a method for resource utilization of dust and sludge containing iron and zinc. The system for resource utilization of dust and sludge containing iron and zinc comprises a mixer, a double-roller ball press machine, curing and drying equipment and a rotary hearth furnace, according to the method, the pretreated dust mud containing iron and zinc and the industrial fresh water are uniformly mixed in the mixer through the DB-4 type composite binder, so that the excellent performance of the DB-4 type composite binder is fully played, the using amount of the binder is reduced, the dry and wet strength and the thermal stability of the iron and zinc pellets are improved, the material returning amount in the production process is reduced, and the production cost is reduced. And the pulverization rate of the metallized pellets is reduced, the production efficiency of resource utilization of the dust and mud containing iron and zinc is improved, the production cost is reduced, the green and low-carbon development route of the national call is met, and the goal of carbon peak reaching and carbon neutralization is achieved.

Description

technical field [0001] The invention belongs to the fields of metallurgy and energy, and in particular relates to a system and method for resource utilization of iron-containing zinc dust sludge. Background technique [0002] There are many points of dust generation in the existing long-term steel production process in my country. In 2021, the national crude steel output will exceed 1 billion tons, and every 1 ton of steel produced will generate 80-120 kg of metallurgical dust and sludge. It contains a large amount of zinc, iron and other elements, and the amount is huge. If it is not recycled, it will not only pollute the environment, but also cause waste of resources. [0003] At present, the mainstream and large-scale method of domestic resource utilization of iron-containing zinc dust and sludge in iron and steel plants is the rotary hearth furnace process, in which the additive with bonding properties is used as the rotary hearth furnace to treat the iron-containing zinc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C22B1/02C22B19/02
CPCC22B1/242C22B1/2406C22B1/02C22B19/02
Inventor 刘坤鹏刘晓轩余志友刘安治曹志成吴佩佩李生忠张然张梦露赵尚
Owner 宝武集团环境资源科技有限公司
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