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Device and method for recovering residual heat by dry-process granulation of metallurgical slag

A waste heat recovery device and dry granulation technology, applied in the fields of metallurgical engineering, environmental protection and energy saving, can solve the problems of affecting waste heat recovery and utilization, low granulation treatment efficiency, low heat exchange efficiency, etc. Slag treatment effect, good sphericity effect

Active Publication Date: 2014-07-16
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a waste heat recovery device for dry granulation of metallurgical slag, which can effectively solve the problem of existing problems by systematically transforming the granulation system and the heat exchange system. There are technical problems in the dry granulation waste heat recovery process of metallurgical slag, such as low granulation treatment efficiency, poor granulation effect, low heat transfer efficiency, and affecting waste heat recovery and utilization.

Method used

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  • Device and method for recovering residual heat by dry-process granulation of metallurgical slag

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Effect test

Embodiment 1

[0061] In the first embodiment, the metallurgical slag dry granulation waste heat recovery device of the present invention is used to perform granulation and waste heat recovery operations on the slag. The porous rotating cup used in the waste heat recovery device for dry granulation of metallurgical slag in this example has a diameter of 40mm, a height of 135mm, a wall thickness of 2mm, an inclination angle of the cup wall of 135°, and an opening diameter of the cup of 1mm. The metallurgical slag used in this embodiment is the blast furnace slag obtained from blast furnace steelmaking, and its main components are as shown in Table 1:

[0062] Table 1 Main chemical composition of slag (wt%)

[0063]

[0064] In this embodiment, the rotation speed of the porous rotating cup of the metallurgical slag dry granulation waste heat recovery device is set to 900, 1200, 1500 and 1800rpm respectively, and the slag temperature is 1450°C. The waste heat recovery device and method were...

Embodiment 2

[0070] In Example 2, the porous rotating cup used in the waste heat recovery device for dry granulation of metallurgical slag has a diameter of 40mm, a height of 135mm, a wall thickness of 3mm, an inclination angle of the cup of 110°, and a diameter of the opening of the cup of 2mm. In this embodiment, the rotating speed of the porous rotating cup of the metallurgical slag dry granulation waste heat recovery device is set to 900, 1200, 1500 and 1800 rpm respectively, and the metallurgical slag dry granulation waste heat recovery device and method of the present invention are used to The blast furnace slag described in Example 1 is subjected to granulation and waste heat recovery operations. The temperature of the slag is 1450°C. The main components of the slag are listed in Table 1, and the average particle size, sphericity and amorphization Rate and other indicators were analyzed, and the results are shown in Table 4 and Table 5:

[0071] Table 4 Slag particle size compositio...

Embodiment 3

[0076] In Example 3, the porous rotating cup used in the waste heat recovery device for dry granulation of metallurgical slag has a diameter of 40mm, a height of 135mm, a wall thickness of 5mm, an inclination angle of 90°, and an opening diameter of the cup of 3mm. In this embodiment, the rotating speed of the porous rotating cup of the metallurgical slag dry granulation waste heat recovery device is set to 900, 1200, 1500 and 1800 rpm respectively, and the metallurgical slag dry granulation waste heat recovery device and method of the present invention are used to The blast furnace slag described in Example 1 is subjected to granulation and waste heat recovery operations. The temperature of the slag is 1450°C. The main components of the slag are listed in Table 1, and the average particle size, sphericity and amorphization Rate and other indicators were analyzed, and the results are shown in Table 6 and Table 7:

[0077] Table 6 Particle size composition (wt%) when the openin...

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Abstract

The invention provides a device and a method for recovering residual heat by dry-process granulation of metallurgical slag. According to the device, a granulation system and a heat exchange system are systematically transformed, so that blocky slag and slag wool are greatly reduced and cooled slag particles obtained by granulation is relatively uniform in size distribution, relatively high in vitrification degree and good in sphericity and can be directly used as raw materials for producing subsequent products such as cement; the limitation on the slag feeding flow caused by a revolving cup is reduced, so that the rotary energy of the porous revolving cup in a rotary granulation process can be fully utilized, the porous revolving cup can run at a relatively high rotary speed and the granulation efficiency is improved; meanwhile, a two-stage residual heat recovery system is adopted, relatively high heat exchange efficiency and residual heat recovery rate are taken into account, and the problems of low granulation efficiency, relatively poor granulation effect, low heat exchange efficiency, influence on residual heat recovery and utilization and the like during a process for recovering residual heat by dry-process granulation of metallurgical slag in the prior art are solved.

Description

technical field [0001] The invention relates to the fields of metallurgical engineering, environmental protection and energy saving, mainly relates to energy saving and emission reduction in metallurgical processes, dry granulation of metallurgical slag, and in particular to a device and method for dry granulation of metallurgical slag. Background technique [0002] Metallurgical slag is a by-product obtained in the process of metal and alloy smelting in the metallurgical industry, and its output is huge. For example, about 350kg of slag is discharged for every ton of blast furnace pig iron produced, and about 30 tons of slag is produced for every ton of ferronickel produced. In addition, a large amount of slag is also discharged in converter steelmaking and other ferroalloy smelting. These metallurgical slags are generally discharged at a temperature of 1400~1700°C, and the sensible heat contained in each ton of slag is about 1.5GJ (1GJ=10 9 joules), which are high-quality...

Claims

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Application Information

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IPC IPC(8): C21B3/08
Inventor 吕学伟秦跃林白晨光张杰陈攀
Owner CHONGQING UNIV
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