A method of cooling molten iron by using converter dust removal ash

Abstract

The invention relates to a method for cooling molten iron by using converter fly ash. The method comprises the following steps: conveying collected converter fly ash to a stock bin for later use; performing KR desulfuration and stirring treatment on the molten iron in a molten iron tank according to the prior art, wherein the clearance height of the molten iron tank is 500-900 millimeters, and the amount of the molten iron in the molten iron tank is 100-140 tons; after the KR desulfuration and stirring treatment is finished, measuring the temperature of molten iron in the molten iron tank; when the measured temperature of the molten iron is higher than 1,280 DEG C, blowing 1.2-3t of converter fly ash into the molten iron tank from the stock bin by using high-pressure nitrogen gas. According to the method, the converter fly ash does not need to be subjected to subsequent processing, and only a fixed amount of converter fly ash is added according to the temperature of the molten iron, so that the processing cost on the converter fly ash is eliminated; slagging can be accelerated effectively; the cooling process steps of the molten iron are simplified; flushing and casting are simplified effectively; the metal yield is increased.

Description

technical field

[0001] The invention relates to a method for lowering the temperature of molten iron by utilizing converter dust removal ash, and belongs to the technical field of pretreatment of molten steel in iron and steel metallurgy. Background technique

[0002] In the process of iron and steel smelting, the high temperature of molten iron (when the temperature of molten iron is ≥1300°C) has a huge impact on the operation of the converter: first, the converter is prone to splashing, which in turn affects the consumption of steel materials and other indicators, which has a great impact on the cost completion; secondly , The amount of cold material added to the converter is large. According to statistics, it can reach up to 10t of sinter. In this case, the converter cannot use automatic steelmaking, which will affect the increase in the proportion of intelligent steelmaking. For example, since 2011, the temperature of molten iron entering the steelmaking plant of Shandon...

Examples

Embodiment 1

[0041] A method for cooling molten iron by utilizing converter dust removal ash, comprising steps as follows:

[0042] (1) Transport the collected converter dust to the silo for standby: use the HV700-18A special suction and discharge vehicle to collect the converter dust and transport it to the silo with high-pressure nitrogen for standby; the special suction and discharge vehicle is equipped with a high-pressure nitrogen source , the pressure range of the high-pressure nitrogen source: 25-30Mpa;

[0043] (2) Carry out KR desulfurization stirring treatment on the molten iron in the molten iron tank according to the prior art, the headroom height range of the molten iron tank is 500-900mm, and the molten iron amount in the molten iron tank ranges from 100-140 tons;

[0044] (3) After the KR stirring desulfurization treatment is completed, measure the temperature of the molten iron in the molten iron tank;

[0045] (4) When the measured temperature of the molten iron is greater ...

Embodiment 2

[0048] A kind of method utilizing converter dedusting dust to molten iron to cool down as described in embodiment 1, its difference is:

[0049] In the step (4), the measured temperature T of the molten iron is: at 1325°C, use high-pressure nitrogen to blow the converter dedusting ash weighing 2.2t from the feed bin into the molten iron tank, and add the converter dedusting ash to the molten iron Speed: 0.5t / min; the blowing pressure of the high-pressure nitrogen gas is 0.04MPa-0.05MP. At the same time, the agitator in the KR desulfurization stirring treatment process of the prior art is used to insert it into the molten iron tank for rotation and agitation to make the molten iron produce Vortex, the converter dedusting ash put into the molten iron surface is involved and fully mixed with the molten iron.

[0050] The temperature of the molten iron in the molten iron tank was monitored in real time, and the temperature of the molten iron dropped by 29°C to 1296°C within about ...

Embodiment 3

[0052] A kind of method utilizing converter dedusting dust to molten iron to cool down as described in embodiment 1, its difference is:

[0053] In the step (4), when the measured temperature T of the molten iron is 1387°C, the converter dedusting ash weighing 2.8t is blown from the feed bin into the molten iron tank by using high-pressure nitrogen gas, and the converter dedusting ash is added to the molten iron speed: 0.7t / min; the injection pressure of the high-pressure nitrogen gas is 0.04MPa-0.05MP, while using the agitator in the prior art KR desulfurization stirring treatment process, it is inserted into the molten iron tank for rotation and agitation, so that the molten iron A vortex is generated, and the converter dedusting ash put into the liquid surface of the molten iron is involved and fully mixed with the molten iron.

[0054] The temperature of the molten iron in the molten iron tank was monitored in real time, and the temperature of the molten iron dropped by 27...

technical field

[0001] The invention relates to a method for lowering the temperature of molten iron by utilizing converter dust removal ash, and belongs to the technical field of pretreatment of molten steel in iron and steel metallurgy. Background technique

[0002] In the process of iron and steel smelting, the high temperature of molten iron (when the temperature of molten iron is ≥1300°C) has a huge impact on the operation of the converter: first, the converter is prone to splashing, which in turn affects the consumption of steel materials and other indicators, which has a great impact on the cost completion; secondly , The amount of cold material added to the converter is large. According to statistics, it can reach up to 10t of sinter. In this case, the converter cannot use automatic steelmaking, which will affect the increase in the proportion of intelligent steelmaking. For example, since 2011, the temperature of molten iron entering the steelmaking plant of Shandon...

Examples

Embodiment 1

[0041] A method for cooling molten iron by utilizing converter dust removal ash, comprising steps as follows:

[0042] (1) Transport the collected converter dust to the silo for standby: use the HV700-18A special suction and discharge vehicle to collect the converter dust and transport it to the silo with high-pressure nitrogen for standby; the special suction and discharge vehicle is equipped with a high-pressure nitrogen source , the pressure range of the high-pressure nitrogen source: 25-30Mpa;

[0043] (2) Carry out KR desulfurization stirring treatment on the molten iron in the molten iron tank according to the prior art, the headroom height range of the molten iron tank is 500-900mm, and the molten iron amount in the molten iron tank ranges from 100-140 tons;

[0044] (3) After the KR stirring desulfurization treatment is completed, measure the temperature of the molten iron in the molten iron tank;

[0045] (4) When the measured temperature of the molten iron is greater ...

Embodiment 2

[0048] A kind of method utilizing converter dedusting dust to molten iron to cool down as described in embodiment 1, its difference is:

[0049] In the step (4), the measured temperature T of the molten iron is: at 1325°C, use high-pressure nitrogen to blow the converter dedusting ash weighing 2.2t from the feed bin into the molten iron tank, and add the converter dedusting ash to the molten iron Speed: 0.5t / min; the blowing pressure of the high-pressure nitrogen gas is 0.04MPa-0.05MP. At the same time, the agitator in the KR desulfurization stirring treatment process of the prior art is used to insert it into the molten iron tank for rotation and agitation to make the molten iron produce Vortex, the converter dedusting ash put into the molten iron surface is involved and fully mixed with the molten iron.

[0050] The temperature of the molten iron in the molten iron tank was monitored in real time, and the temperature of the molten iron dropped by 29°C to 1296°C within about ...

Embodiment 3

[0052] A kind of method utilizing converter dedusting dust to molten iron to cool down as described in embodiment 1, its difference is:

[0053] In the step (4), when the measured temperature T of the molten iron is 1387°C, the converter dedusting ash weighing 2.8t is blown from the feed bin into the molten iron tank by using high-pressure nitrogen gas, and the converter dedusting ash is added to the molten iron speed: 0.7t / min; the injection pressure of the high-pressure nitrogen gas is 0.04MPa-0.05MP, while using the agitator in the prior art KR desulfurization stirring treatment process, it is inserted into the molten iron tank for rotation and agitation, so that the molten iron A vortex is generated, and the converter dedusting ash put into the liquid surface of the molten iron is involved and fully mixed with the molten iron.

[0054] The temperature of the molten iron in the molten iron tank was monitored in real time, and the temperature of the molten iron dropped by 27...

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