CN217398956U

CN217398956U - Device for treating zinc-containing dust mud by using rotary kiln

Info

Publication number: CN217398956U
Application number: CN202221131464.2U
Authority: CN
Inventors: 朱华锋; 许伯文; 王倩
Original assignee: Shandong Luxin Guohe Energy Saving And Environmental Protection Technology Co ltd
Current assignee: Shandong Luxin Guohe Energy Saving And Environmental Protection Technology Co ltd
Priority date: 2022-05-12
Filing date: 2022-05-12
Publication date: 2022-09-09
Anticipated expiration: 2032-05-12

Abstract

The utility model discloses a device that zinciferous dirt mud utilized rotary kiln to deal with, by proportioning bins (1), mix pelletizer (2), rotary kiln (4), deposit room (8), exhaust-heat boiler (9) are constituteed, the reutilization problem that zinciferous dirt mud utilized of one of the environmental protection difficult problem of long-term puzzlement steel industry has been solved, a series of problems such as blast furnace ironmaking process arouses that blast furnace shaft becomes thick because of zinc content is high in the raw materials, blast furnace is in the same direction as the line difficulty, coal gas utilization rate reduces have been overcome, it is poor to have avoided current zinciferous dirt mud to handle technological effect simultaneously, the operation degree of difficulty is big, shortcoming with high costs.

Description

Device for treating zinc-containing dust mud by using rotary kiln

Technical Field

The utility model belongs to the useless category of dealing with of industry solid belongs to a zinc-containing dirt mud processing apparatus, relates to a zinc-containing dirt mud utilizes the device that the rotary kiln was dealt with.

Background

How to treat and utilize solid wastes such as smelting slag, metallurgical dust and mud and the like is one of the environmental protection problems which puzzle the steel industry for a long time. In the existing steel production technology in China, 80-120 kg of metallurgical dust and mud are generated when 1 ton of steel is produced, the metallurgical dust and mud contain a large amount of elements such as zinc, iron and the like, the quantity is large, and if the metallurgical dust and mud can not be recycled, the environment is polluted and resources are wasted. Zinc is a trace harmful element in the blast furnace burden of a steel plant, and is generally fed into the furnace in the form of oxides or sulfides. The zinc compound is easily reduced in the blast furnace and reduced to zinc vapor by carbon monoxide at a high temperature of more than 1000 ℃. The zinc vapour rises with the blast furnace gas. Wherein part of zinc steam is deposited after being oxidized in the upper low-temperature zone of the blast furnace and descends together with furnace burden, thus forming the circulating accumulation of zinc in the furnace in cycles, which is called as the 'small circulation' of zinc in the blast furnace. Most of the zinc steam enters a coal gas dust removal system along with coal gas, most of the zinc enters sludge obtained by wet dust removal or dust obtained by dry dust removal, and if the zinc-containing dust sludge is directly recycled, the zinc enters the blast furnace again, so that a 'large circulation' of the zinc in the blast furnace ironmaking system is formed. When the zinc content in the raw materials reaches a certain level, a series of problems of the thickening of the furnace body of the blast furnace, the difficulty in the smooth operation of the blast furnace, the reduction of the utilization rate of coal gas and the like can be caused, and the operation of the blast furnace is seriously disturbed. The zinc-containing dust and sludge of steel plants are of various types and are mainly distributed in the working procedures of sintering, blast furnaces, converters, electric furnaces and the like.

The existing zinc-containing dust and mud treatment methods comprise 3 physical methods, wet methods and fire methods, wherein the physical methods are simple and easy to implement, but the zinc enrichment efficiency is low; although the enrichment rate of the wet process is high, the zinc content in the treated slag is still high, the zinc cannot be effectively utilized, and secondary pollution such as sulfur, chlorine and the like is easily caused due to improper operation; the traditional pyrometallurgical process has the defects of large investment and high cost.

Disclosure of Invention

In order to solve the problems existing in the current process, the utility model discloses a device for treating zinc-containing dust mud by using a rotary kiln, which consists of a proportioning bin 1, a mixing pelletizer 2, a rotary kiln 4, a settling chamber 8 and a waste heat boiler 9, wherein the proportioning bin 1 is connected to the mixing pelletizer 2 through a belt conveyor, the mixing pelletizer 2 is connected with a feeding hopper of the rotary kiln 4 through a hoisting machine 3, and a smoke chamber at the tail part of the rotary kiln 4 is connected with a hot smoke inlet of the waste heat boiler 9 through the settling chamber 8;

the proportioning bin 1 comprises a pulverized coal bin, a bonding bin, a pulverized coal bin, a returning bin, a steelmaking dedusting ash bin, a blast furnace dedusting ash bin and a sintering dedusting ash bin, and each bin is provided with a proportioning belt scale and a bin wall vibrator;

a burner 5 is arranged in the kiln head area of the rotary kiln 4, a discharge hole at the lower part of the kiln head is connected with a cooling roller 6 through a sealing device, and sintering slag is conveyed to a slag bin 7 through a belt conveyor after passing through the cooling roller 6; the kiln body area is provided with a rolling ring and a transmission device; the kiln tail area is provided with a smoke chamber and a feeding hopper, the feeding hopper is connected with a lifter 3, and the smoke chamber is connected with a smoke inlet of a settling chamber 8 through a large flue;

the waste heat boiler 9 is of a vertical structure, a hot flue gas inlet is arranged at the upper part of the waste heat boiler 9 and connected with a flue gas outlet of the settling chamber 8, a flue gas outlet is arranged at the lower part of the waste heat boiler 9 and connected with the dust remover 10, an inlet of a heat exchange medium is arranged at the lower part of the waste heat boiler 9, an outlet of the heat exchange medium is arranged at the upper part of the waste heat boiler 9, and a settling bin is arranged at the bottom of the waste heat boiler 9; the flue gas after heat exchange by the waste heat boiler 9 enters a desulfurizing tower 11 through a dust remover 10 to remove sulfur dioxide and nitrogen oxides, and then is discharged into the atmosphere through a chimney 12.

Drawings

The invention will be described in further detail with reference to the following drawings and embodiments:

FIG. 1 is a simplified process diagram of the present invention;

in the figure: 1: proportioning bins, 2: mixing pelletizer, 3: hoister, 4: rotary kiln, 5: burner, 6: cooling drum, 7: slag bin, 8: settling chamber, 9: waste heat boiler, 10: dust remover, 11 desulfurizing tower, 12: chimney, 13: a fan.

Detailed Description

The utility model relates to a device that zinc-containing dust mud utilized rotary kiln to deal with, by proportioning bins 1, mix pelletizer 2, rotary kiln 4, settling chamber 8, exhaust-heat boiler 9 and constitute, zinc-containing dust mud by proportioning bins 1 according to the proportion after the belt conveyor conveys to mix pelletizer 2, pellet that mix pelletizer 2 production is transported to the feeding hopper of rotary kiln 4 through lifting machine 3, the hot flue gas that rotary kiln 4 produced is discharged into exhaust-heat boiler 9's hot flue gas entry through settling chamber 8 by rotary kiln 4 afterbody smoke chamber;

the batching bin 1 comprises a pulverized coal bin, a bonding bin, a pulverized coal bin, a returning bin, a steelmaking dust removal bin, a blast furnace dust removal bin and a sintering dust removal bin, wherein corresponding powder is filled in each bin, and a batching belt scale and a bin wall vibrator are arranged at the lower part of each bin;

a burner 5 is arranged in the kiln head area of the rotary kiln 4, a discharge hole at the lower part of the kiln head is connected with a cooling roller 6 through a sealing device, the waste heat generated by the cooling roller 6 enters the rotary kiln 4 for secondary utilization under the action of system negative pressure, and after sintering, slag materials are conveyed to a slag bin 7 through a belt conveyor to be stored after passing through the cooling roller 6 and are mixed with blast furnace sintering raw materials to further extract iron-containing components; the kiln body area is provided with a rolling ring and a transmission device; the kiln tail area is provided with a smoke chamber and a feeding hopper, the feeding hopper is connected with a lifter 3, and the smoke chamber is connected with a smoke inlet of a settling chamber 8 through a large flue;

the waste heat boiler 9 is of a vertical structure, a hot flue gas inlet is arranged at the upper part of the waste heat boiler 9 and is connected with a flue gas outlet of the settling chamber 8, a flue gas outlet is arranged at the lower part of the waste heat boiler 9 and is connected with the dust remover 10, an inlet of a heat exchange medium is arranged at the lower part of the waste heat boiler 9, an outlet of the heat exchange medium is arranged at the upper part of the waste heat boiler 9, and a settling bin is arranged at the bottom of the waste heat boiler 9; the flue gas after heat exchange by the waste heat boiler 9 passes through a dust remover 10 and then enters a desulfurizing tower 11 under the action of a fan 13, and purified air after sulfur dioxide and nitrogen oxide are removed is discharged into the atmosphere through a chimney 12.

Claims

1. The utility model provides a device that zinc-containing dirt mud utilized rotary kiln to deal with, comprises proportioning bins (1), mixed pelletizer (2), rotary kiln (4), deposit room (8), exhaust-heat boiler (9), characterized by: the batching bin (1) is connected to a mixing pelletizer (2) through a belt conveyor, the mixing pelletizer (2) is connected with a feeding hopper of a rotary kiln (4) through a lifter (3), and a smoke chamber at the tail part of the rotary kiln (4) is connected with a hot smoke inlet of a waste heat boiler (9) through a settling chamber (8);

the proportioning bin (1) comprises a pulverized coal bin, a bonding bin, a pulverized coal bin, a returning bin, a steelmaking dedusting ash bin, a blast furnace dedusting ash bin and a sintering dedusting ash bin, and each bin is provided with a proportioning belt scale and a bin wall vibrator;

a burner (5) is arranged in the kiln head area of the rotary kiln (4), a discharge hole at the lower part of the kiln head is connected with a cooling roller (6) through a sealing device, and sintering slag is conveyed to a slag bin (7) through a belt conveyor after passing through the cooling roller (6); the kiln body area is provided with a rolling ring and a transmission device; the kiln tail area is provided with a smoke chamber and a feeding hopper, the feeding hopper is connected with a lifter (3), and the smoke chamber is connected with a smoke inlet of a settling chamber (8) through a large flue;

the waste heat boiler (9) is of a vertical structure, a hot flue gas inlet is arranged at the upper part of the waste heat boiler and connected with a flue gas outlet of the settling chamber (8), a flue gas outlet connected with a dust remover (10) is arranged at the lower part of the waste heat boiler (9), an inlet of a heat exchange medium is arranged at the lower part of the waste heat boiler (9), an outlet of the heat exchange medium is arranged at the upper part of the waste heat boiler (9), and a settling bin is arranged at the bottom of the waste heat boiler (9).