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System and method for recovering iron and waste heat from molten copper residues respectively through step-by-step reduction and coal gasification

A technology for coal gasification and iron recovery, applied in the fields of resources and environment, can solve the problems of low iron recovery rate, difficulty in recovering waste heat from copper slag slag, etc.

Active Publication Date: 2015-08-19
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Aiming at the problems existing in the prior art, the present invention provides a system and method for recovering iron from molten copper slag step by step and recovering waste heat from coal gasification, which can realize the goal of efficiently recovering copper and iron components in copper slag and waste heat of copper slag , Solve the technical problems of low iron recovery rate in copper slag and difficult recovery of waste heat from copper slag slag

Method used

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  • System and method for recovering iron and waste heat from molten copper residues respectively through step-by-step reduction and coal gasification
  • System and method for recovering iron and waste heat from molten copper residues respectively through step-by-step reduction and coal gasification
  • System and method for recovering iron and waste heat from molten copper residues respectively through step-by-step reduction and coal gasification

Examples

Experimental program
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Effect test

Embodiment 1

[0101] A system for step-by-step reduction and recovery of iron from molten copper slag and recovery of waste heat from coal gasification such as figure 2 As shown, it includes reduction iron extraction furnace 1, coal gasification furnace 13, granulation and waste heat recovery device 22, flue gas heat exchanger 10, 11, gas separation and dust removal device 27, waste heat boiler 16, 24, cyclone dust collector 17, gas Cabinet 18, transportation device 25, in which the gas cabinet 18 is connected to the reduction and iron extraction furnace 1, and the upper end of the reduction and iron extraction furnace 1 is connected to the gas separation and dust removal device 27 through the flue gas heat exchanger 10, 11, and the upper part of the separation and dust removal device 27 is provided with a pipe connection The gas cabinet 18, the slag outlet of the iron reduction furnace 1 is connected to the coal gasification furnace 13, the coal gasification furnace 13 is connected to one ...

Embodiment 2

[0116] The system for step-by-step reduction and recovery of iron and copper from molten copper slag and coal gasification for recovery of waste heat is the same as that of Embodiment 1, the difference is that: the granulation and waste heat recovery device does not have a fan 23 and a waste heat boiler 26, and its annular metal baffle has 7 stages , the length of the baffles is 0.4m, the spacing is 0.4m, and the angle with the horizontal plane is 10°; cold water is passed into the metal water wall for heat exchange;

[0117] Using the above-mentioned device to recover iron and copper step by step from molten copper slag and coal gasification to recover waste heat, the specific steps are as follows:

[0118] (1) Step-by-step reduction for iron extraction and gas recovery:

[0119]The molten copper slag at 1200-1300°C discharged from the copper smelting furnace flows into the iron reduction furnace, and the CO in the gas tank is burned through the gas burner. When the temperatu...

Embodiment 3

[0128] The system for step-by-step reduction and recovery of iron and copper from molten copper slag and coal gasification for recovery of waste heat is the same as in Example 1, except that the granulation and waste heat recovery device does not have a fan 23 and a waste heat boiler 26, and its annular metal baffle plate, 7 stage, the length of the baffles is 0.8m, the spacing is 0.6m, and the angle with the horizontal plane is 30°; cold water is passed through the metal water-cooled wall for heat exchange.

[0129] Using the above-mentioned device to recover iron and copper step by step from molten copper slag and coal gasification to recover waste heat, the specific steps are as follows:

[0130] (1) Step-by-step reduction for iron extraction and gas recovery:

[0131] The molten copper slag at 1200-1300°C discharged from the copper smelting furnace flows into the iron reduction furnace, and the CO in the gas tank is burned through the gas burner. When the temperature of th...

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Abstract

The invention discloses a system and a method for recovering iron and waste heat from molten copper residues respectively through step-by-step reduction and coal gasification, belonging to the fields of resources and environments. The system comprises a reductive iron extraction furnace, a coal gasification furnace, a granulating and waste heat recovering device, a gas heat exchanger, a gas separating and dust collecting device, a waste heat boiler, a cyclone dust collector, a gas cabinet and a transportation device. The method comprises the following three steps of step-by-step reductive iron extraction and coal gas recovery; coal gasification and coal gas recovery; and granulation and waste heat recovery. By using the system and method disclosed by the invention, the link of a dry-process copper residue granulation and waste heat recovery process and a copper residue valuable metal extracting process is realized, iron in copper residues can be effectively recovered, the recovery rate of the iron is up to more than 90%, and CO gases generated in the recovery process can be recycled, so that the environment is protected, resources are saved, and meanwhile a series of problems existing in the high-temperature copper residue treating process are solved.

Description

technical field [0001] The invention belongs to the field of resources and environment, and in particular relates to a system and method for stepwise reduction and recovery of iron from molten copper slag and coal gasification for recovery of waste heat. Background technique [0002] In recent years, the global copper smelting industry has developed rapidly. In 1980, the world's total annual output of copper was 7.5 million tons, but currently the world's annual copper output has exceeded 16 million tons. While the world's copper production is growing rapidly, my country's copper smelting industry has also achieved unprecedented development. In 2007, my country became the world's largest copper producer. By 2012, my country's copper production had accounted for 30% of the global copper production. [0003] Copper smelting mainly includes pyro-method and hydro-method smelting. Since hydro-method smelting is limited by the grade and type of ore, pyro-method smelting has a wide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C21B3/06F27D17/00
CPCY02P10/25Y02W30/50
Inventor 于庆波左宗良段文军秦勤
Owner NORTHEASTERN UNIV
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