Method for recovering high-grade heat energy of blast furnace slag

Abstract

The invention discloses a method for recovering high-grade heat energy of blast furnace slag. The method comprises the following steps of S1, treating foamed slag in front of a vanadium titano-magnetite furnace, specifically, shoveling a heat absorbing material into a large ditch for cooling, melting the heat absorbing material by absorbing heat in a main ditch, reducing the slag temperature, andeliminating the hidden danger that the foamed slag overflows the ditch; S2, vanadium-titanium ore smelting ironmaking water properties, specifically, further processing the blast furnace to form a sintered or pellet production raw material; and S3, performing sensible heat treatment on a slag-iron mixture through furnace slag. The method has the following beneficial effects that the high-grade heat value of the blast furnace slag is utilized, after part of sensible heat of the furnace slag is utilized, the temperature of the furnace slag is still higher than the melting point, the furnace slagis discharged from a slag trough in a liquid state, further heat energy development and utilization of the furnace slag are not affected, and comprehensive utilization of ironmaking internal resources is achieved; and secondary resources are reduced, repeated processing and transportation costs are reduced, foam slag can be generated when the furnace slag temperature is too high, the slag-iron mixture is used for cooling the furnace slag, foam slag formation can be successfully inhibited, and sensible heat of the furnace slag is recovered.

Description

technical field [0001] The invention relates to the field of mechanical technology, in particular to a method for recovering high-grade heat energy from blast furnace slag. Background technique [0002] 1. Sensible heat of blast furnace slag [0003] A large amount of high-temperature slag is produced in the process of blast furnace ironmaking. These blast furnace slags have a lot of sensible heat. The smelting grade of vanadium-titanium magnetite is low and the amount of slag is large. Chuanwei belongs to the smelting of medium titanium slag, and the slag ratio is 460kg / t.Fe The enthalpy of slag is calculated as 430kcal / kg, and the sensible heat of slag produced by smelting one ton of pig iron is: 460*430=179800kcal. Since the main components of blast furnace slag are CaO, SiO2, MgO, TiO2, etc., the chemical composition before and after generation, The structure has not changed. Therefore, the enthalpy of blast furnace slag can be regarded as sensible heat for calculation....

AI Technical Summary

Problems solved by technology

[0007] 2. Utilization status of blast furnace slag

[0012] 2. Some cities in the north recycle the calorific value of low-grade slag water for heating, but only in winter, with long idle time and difficult maintenance

[0013] 3. The blast furnace slag casting block making process is to cool the liquid slag, make blocks, and then recover the heat energy of the red hot slag block. The technology is in the development stage, which belongs to the utilization of medium-grade heat energy.

[0014] The above three methods not only require large investment, but also immature technology development, and cannot use the high-grade heat energy of slag

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