A method and device for calcium treatment of molten steel by injecting calcium steam

A calcium vapor and calcium treatment technology is applied in the field of calcium treatment of molten steel by spraying calcium steam, which can solve the problems of deteriorating calcium treatment effect, increasing treatment cost, splashing, etc. The effect of high processing efficiency and strong operation safety

Active Publication Date: 2015-12-30
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

There is also a direct addition method, that is, the silicon-calcium alloy is directly added to the surface of the molten steel, and the calcium is dissolved in the molten steel by blowing argon and stirred to achieve the purpose of treatment. This method has a large calcium burning loss and poor treatment effect.
The above methods are to directly add solid metal calcium (calcium alloy or calcium wire) into the high-temperature molten steel. Due to the high vapor pressure of calcium, the calcium will be vaporized instantly, resulting in rapid volume expansion, which in turn will cause violent tumbling and splashing of the molten steel surface. Lead to the secondary oxidation of molten steel and the increase of inclusions, greatly deteriorating the effect of calcium treatment
At the same time, the burning loss of calcium is serious, resulting in higher processing costs.

Method used

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  • A method and device for calcium treatment of molten steel by injecting calcium steam

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Injecting calcium steam of the present invention carries out calcium treatment method to molten steel, carries out according to the following steps:

[0038] (1) Preparation of high temperature calcium vapor:

[0039] Calcining marble to obtain quicklime, mixing quicklime and Al reducing agent according to the mass ratio of CaO:Al=100:75, and then pressing it into pellets under the pressure of 20MPa, putting the prepared pellets into the high temperature outside the ladle In the furnace, it is heated to 1500°C to generate high-temperature calcium vapor;

[0040] (2) High temperature calcium vapor transportation:

[0041] One end of the high-temperature furnace that generates high-temperature calcium vapor is airtightly connected to the spray gun through a high-temperature delivery pipeline. The spray gun is inserted into the molten steel pool of the ladle, and the other end of the high-temperature furnace tube is sealed with a flange. An inlet pipe is installed on the ...

Embodiment 2

[0046] Injecting calcium steam of the present invention carries out calcium treatment method to molten steel, carries out according to the following steps:

[0047] (1) Preparation of high temperature calcium vapor:

[0048] Calcining marble to obtain quicklime, mixing quicklime and Al reducing agent according to the mass ratio of CaO:Al=100:70, and then pressing it into pellets under a pressure of 50MPa, and putting the prepared pellets into the high temperature outside the ladle In the furnace, it is heated to 1350°C to generate high-temperature calcium vapor;

[0049] (2) High temperature calcium vapor transportation:

[0050] One end of the high-temperature furnace that generates high-temperature calcium vapor is airtightly connected to the spray gun through a high-temperature delivery pipeline. The spray gun is inserted into the molten steel pool of the ladle, and the other end of the high-temperature furnace tube is sealed with a flange. The gas pipe leads into the hig...

Embodiment 3

[0055] Injecting calcium steam of the present invention carries out calcium treatment method to molten steel, carries out according to the following steps:

[0056] (1) Preparation of high temperature calcium vapor:

[0057] Calcining marble to obtain quicklime, mixing quicklime and Al reducing agent according to the mass ratio of CaO:Al=100:60, and then pressing it into pellets under a pressure of 100MPa, putting the prepared pellets into the high temperature outside the ladle In the furnace, it is heated to 1600°C to generate high-temperature calcium vapor;

[0058] (2) High temperature calcium vapor transportation:

[0059] One end of the high-temperature furnace that generates high-temperature calcium vapor is airtightly connected to the spray gun through a high-temperature delivery pipeline. The spray gun is inserted into the molten steel pool of the ladle, and the other end of the high-temperature furnace tube is sealed with a flange. The gas pipe leads into the high-t...

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Abstract

The invention belongs to the field of molten steel refining, and in particular relates to a blowing calcium steam method and device for calcium treatment on molten steel. First, a calcium source is placed into a high temperature furnace outside a steel ladle, and heated to generate calcium steam. One end of the high temperature furnace is hermetically connected with a spray gun through a high temperature conveying pipeline, the spray gun inserts into a molten steel molten pool of the steel ladle, the other end of a high temperature furnace pipe is sealed by a flange, and an air inlet pipe is arranged on the flange. Inert gas is introduced into the high temperature furnace from the air inlet pipe to take the generated high temperature calcium steam out of the high temperature furnace, and is sent to the spray gun in the steel ladle by the high temperature conveying pipeline; and the high temperature calcium steam carried by the inert gas is blown into the ladle molten by the spray gun. The invention has the advantages of high yield of calcium, low treatment cost, high calcium treatment efficiency and the strong operation safety.

Description

technical field [0001] The invention belongs to the field of molten steel refining, and in particular relates to a calcium treatment method and device for molten steel by injecting calcium steam. Background technique [0002] There are many inclusions in steel, which not only reduces the yield of steel, but also affects the mechanical properties of steel. With the advancement of refining technology, the process of calcium treatment of molten steel began to appear in the 1970s. At present, the process of calcium treatment has become a smelting process. An important out-of-furnace refining hand for varieties of steel. Calcium treatment of molten steel can deoxidize, desulfurize, change the shape of inclusions, prevent nozzle nodulation, clean molten steel, and improve steel quality. The principle is: after adding an appropriate amount of metal calcium to the steel, the brittle Al with high melting point produced by deoxidation of aluminum can be 2 o 3 Treatment of Inclusion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/072
Inventor 张廷安豆志河刘燕王聪张旭华张子木吕国志赵秋月赫冀成蒋孝丽
Owner NORTHEASTERN UNIV LIAONING
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