Process and device for processing liquid steel slag

A technology of liquid steel slag and processing technology, which is applied in the field of metallurgical production, can solve the problems of lack of industrial application technology, low sensible heat recovery rate of liquid slag, and failure to recycle, so as to achieve fine slag particles, reduce dust pollution, and facilitate the separation of slag and iron Effect

Active Publication Date: 2010-04-07
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the air quenching process still has defects such as the complete oxidation of the elemental iron in the slag during the air quenching process, and the low recovery rate of the sensible heat of the liquid slag or even no re

Method used

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  • Process and device for processing liquid steel slag
  • Process and device for processing liquid steel slag
  • Process and device for processing liquid steel slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: The liquid steel slag treatment is carried out in the device of the present invention, the average flow rate of the liquid steel slag entering the granulation tank is 1t / min, the nitrogen pressure entering the gas quenching gas nozzle is 0.3Mpa, and the flow rate is 20Nm 3 / min, the cooling nitrogen pressure at the inlet of the granulation tank and the cooling tank is 6000Kpa, and the cooling nitrogen flow at the inlet of the granulation tank is 1200Nm 3 / min, cooling tank cooling nitrogen flow 1200Nm 3 / min. The temperature of the high-temperature cooling gas entering the waste heat boiler is 450°C.

Embodiment 2

[0041] Example 2: Liquid steel slag treatment is carried out in the device of the present invention, the average flow rate of liquid steel slag entering the granulation tank is 1t / min, the nitrogen pressure entering the gas quenching gas nozzle is 0.4Mpa, and the flow rate is 30Nm 3 / min, the cooling nitrogen pressure at the inlet of the granulation tank and the cooling tank is 5000Kpa, and the cooling nitrogen flow at the inlet of the granulation tank is 1100Nm 3 / min, cooling tank cooling nitrogen flow 1100Nm 3 / min. The temperature of the high temperature cooling gas entering the waste heat boiler is 500°C.

Embodiment 3

[0042] Example 3: The liquid steel slag treatment is carried out in the device of the present invention, the average flow rate of the liquid steel slag entering the granulation tank is 1t / min, the nitrogen pressure entering the gas quenching gas nozzle is 0.6Mpa, and the flow rate is 40Nm 3 / min, the cooling nitrogen pressure at the inlet of the granulation tank and the cooling tank is 4000Kpa, and the cooling nitrogen flow at the inlet of the granulation tank is 1000Nm 3 / min, cooling tank cooling nitrogen flow 1000Nm 3 / min. The temperature of the high temperature cooling gas entering the waste heat boiler is 550°C.

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Abstract

The invention provides a process and device for processing liquid steel slag, belonging to the technical field of the metallurgical equipment and aiming at solving the problems of liquid steel slag granulation and liquid steel slag sensible heat recovery. The process for processing the liquid steel slag comprises the following steps: a, granulating the liquid steel slag by quenching gas; b, cooling the high-temperature liquid solid steel slag; c, recovering liquid steel slag sensible heat; and d, reusing cooling gas. The invention also provides a device for processing liquid steel slag. The invention is mainly characterized in that firstly, the liquid steel slag is granulated in a sealed granulating tank, the liquid steel slag is small and uniform, the pure Fe in the liquid steel slag can not be oxidized and the economic benefit of the liquid steel slag processing process is improved; secondly, the liquid solid steel slag is cooled in a sealed cooling tank, less cooling gas leaks, the dust pollution is reduced, and less cooling gas is supplemented; and thirdly, the inert gas is used as the cooling gas in the granulating tank and the cooling tank, and the cooling gas inversely exchanges heat with the liquid steel slag, thus the efficiency of exchanging heat between the liquid steel slag and the cooling gas is improved, the temperature of the cooling gas at the outlet is increased, and the liquid steel slag sensible heat is recovered.

Description

technical field [0001] The invention relates to a liquid steel slag granulation technology, in particular to a liquid steel slag treatment process and device integrating steel slag granulation, cooling and sensible heat recovery, and belongs to the technical field of metallurgical production. Background technique [0002] Steel slag is a by-product in the steelmaking process. The temperature of the furnace is 1550℃~1650℃, and the physical heat is 1.7GJ / t, which is equivalent to about 60kg standard coal per ton of slag. It is the only high-quality waste heat that cannot be effectively recycled in the current steel enterprises resource. In addition, the total iron content of solid steel slag is 15% to 28%, and a considerable part exists in the form of elemental iron, accounting for about 8% to 10% of the total. The steel slag tailings after iron extraction also have high mineral value, and the main chemical components are CaO, SiO 2 , FeO, MgO, etc., are non-renewable minera...

Claims

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Application Information

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IPC IPC(8): C21B3/06F22B1/18
CPCY02P10/20Y02W30/50
Inventor 张玉柱李俊国韩志杰邢宏伟胡长庆龙跃
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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