Slag thermal-sealed vapour maintenance treating method

Abstract

The invention is a slag heat-covering steam-preserving processing method, including the steps: preposing slag, feeding slag, feeding water, supplying steam, heat-covering stabilizing and flush practice. It directly places blocky slag in a heat-covering set, with the aid of water spray to crack the slag and associated with heat preservation by heat-covering and steam supplication and supplement, maintains the slag temperature within the set temperature of 100 deg.C-200 deg.C to provide enough stabilizing temperature, to make dissociative calcium oxide in the slag able to quickly hydrolyze into calcium oxide, and finally achieves the purpose to stabilize and crush.

Description

【Technical field】 [0001] The invention relates to a steel slag treatment method, in particular to a steel slag hot stuffy steam curing treatment method capable of quickly stabilizing the steel slag. 【Background technique】 [0002] The steelmaking process of the consistent operation steelmaking plant is prior to the blast furnace ironmaking process. Coal, limestone, etc. are added as fluxing agents. After the iron ore is heated and melted into molten iron, it is sent to the steelmaking plant for steelmaking. The impurities in the iron ore will be discharged, which is blast furnace slag (blast furnace stone). Then, it enters the converter steelmaking process. Firstly, scrap steel is put into the bottom of the converter, and the molten iron after blast furnace ironmaking is introduced from the furnace mouth. In order to meet the requirements of the steel composition specifications, an appropriate amount of limestone, fluorite, and ferromanganese will be added. The ore and sili...

AI Technical Summary

Problems solved by technology

[0009] 1. Cause air pollution problem: Since the high-temperature steel slag is discharged in the form of liquid, it is dumped on the ground, and since the steel slag contains substances with heavy specific gravity such as steel or iron, after cooling for a period of time, the steel or iron and other substances will gradually The ground deposits at the bottom of the steel slag, which is easy to cause bonding with the ground. Therefore, the operator will spray water to crack it into lumps for subsequent transportation.

However, when the aforementioned steel slag is sprayed with water to cool down and cracked into lumps, it is easy to generate dust and cause air pollution.

[0010] 2. Unstable quality and slow production speed: Due to the existing tank-type hot stuffing method, the cooled and cracked steel slag is transported to the hot stuffy slag tank, and water is sprayed on the steel slag, so that the heat generated by the steel slag itself And the pressure is accumulated in the hot stuffy slag tank, and the steel slag can be granulated and stabilized by long-term health preservation

However, in order to maintain a controllable temperature and pressure in the hot stuffy slag tank, the equipment of the hot stuffy slag tank must have a high heat preservation effect to avoid the rapid heat dissipation from affecting the treatment effect, and at the same time, the amount that can be processed each time It can’t be too much (the volume of the hot stuffy slag tank has its limit), otherwise the steel slag treatment will be incompletely missing. Because of the aforementioned premise, the quality of steel slag treatment cannot be stabilized and the production speed is slow, etc.

[0011] Continuing the above-mentioned lack of production speed, although the existing tank-type hot stuffing method seems to be able to increase the steel slag processing capacity by using the hot stuffy slag tank, but because the existing tank-type hot stuffing method completely utilizes the heat generated by the steel slag after spraying water Therefore, the amount of steel slag to be processed is too much, and the heat and pressure released by the steel slag sprayed with water are too high. In addition to the sudden increase in the pressure in the tank, it is easy to cause an explosion when it cannot be properly discharged. industrial safety incident

However, if the pressure can be relieved in a timely manner, it is difficult whether the large amount of steel slag accumulated in the hot stuffy slag tank can be fully stabilized by the hot stuffy heat of the steel slag waste heat, so the amount of steel slag that can be processed each time There is a limit to maintain the amount of steel slag that can be reliably and stably maintained each time

[0012] Continuing the lack of stable quality mentioned above, since the steel slag has been sprayed with water when it is discharged, the steel slag sent into the hot stuffy slag tank will still be crushed again

However, there is a huge difference in temperature between the surface and the center of massive steel slag, so when the steel slag is hot stuffy, the temperature will gradually disappear due to the difference in temperature and uneven distribution of the steel slag, coupled with the hot stuffy process Factors such as steel slag heat-stuffing process cannot be maintained at a fixed temperature and pressure for health preservation, making it difficult to control the stabilization time, which in turn makes the stabilized quality of steel slag uneven, and it is difficult to demonstrate the effect of its stable quality

[0013] 3. The pre-treatment is complicated and the equipment is easily damaged: the size of the hot stuffy slag tank is limited due to various factors, so the input steel slag must be pre-treated to increase the amount of steel slag input, so it is more Complicated, that is, when the steel slag is put into the hot stuffy slag tank, because the steel slag contains steel or iron and other substances, in order to prevent these substances from occupying the space in the hot stuffy slag tank and increase the processing capacity of the steel slag each time, the pre- In terms of processing, the steel or iron in the steel slag must be screened out, and then put into the hot stuffy slag tank for processing, so the pre-processing is more troublesome

In addition, the screening operation of steel slag is carried out at high temperature, so the screening equipment is easily damaged

[0014] 4. Expensive equipment: The existing tank-type hot stuffing method uses the heat and pressure generated by the steel slag itself to accumulate in the hot stuffy slag tank, and achieves the effects of granulation and stabilization of the steel slag through long-term health preservation. Therefore, the The heat preservation effect of the hot stuffy slag tank directly affects the quality of steel slag stabilization, so the equipment cost of the hot stuffy slag tank is relatively increased

[0016] Although the above-mentioned existing steam curing method can stabilize steel slag, and solve the defects of the existing tank-type heat-stuffing method, such as expensive equipment, easy damage and unstable quality, there are still the following defects in actual use, which are described in detail as follows:

[0017] 1. Cause air pollution problem: Since the existing steam curing method is still the same as the existing tank-type hot stuffing method, that is, the high-temperature steel slag is discharged on the ground after being discharged in liquid form, and in view of the fact that the steel slag contains steel or iron and other specific gravity Therefore, after cooling for a period of time, steel or iron and other substances will gradually settle at the bottom of the steel slag, which is easy to cause bonding with the ground. Therefore, the operator will spray water to crack it into lumps, so as to facilitate Subsequent transport

However, when the aforementioned steel slag is sprayed with water to cool down and cracked into lumps, it is easy to generate dust and cause air pollution.

[0018] 2. Complicated pre-treatment: After the existing steam curing method is put into the furnace tank, there is no water spray cracking operation, and it is completely done by steam supplementation. Therefore, pre-treatment is required for the input steel slag. In addition to increasing the amount of steel slag input, the steel slag must have a particle size limit, so it must be repeatedly ground and screened for larger steel slag particles, so the pre-operation is more complicated

[0019] 3. Large consumption of steam: Since the existing steam curing method fully utilizes the supplementary effect of steam to process steel slag at normal temperature, it must consume a lot of steam to maintain a certain temperature and pressure in the furnace tank, and the relative cost higher

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