A method and device for aluminum-magnesium composite deoxidation alloying

A technology of composite deoxidizing alloy and aluminum-magnesium is applied in the field of iron and steel smelting, which can solve the problems of high price, difficult preparation, poor technical economy and the like, and achieve the effects of convenient operation and simple device structure.

Active Publication Date: 2020-06-23
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This composite deoxidizer contains magnesium alkaline earth alloy and RE rare earth, which is difficult to prepare and expensive. It is not good in technology and economy to use it for deoxidation and alloying operation after steelmaking.

Method used

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  • A method and device for aluminum-magnesium composite deoxidation alloying
  • A method and device for aluminum-magnesium composite deoxidation alloying
  • A method and device for aluminum-magnesium composite deoxidation alloying

Examples

Experimental program
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Effect test

Embodiment 1

[0057] see figure 1 , The special electrolytic reaction control device of the present invention includes an anode lifting device 1 , an anode 2 , a ladle 5 , a cathode lifting device 6 , a cathode 7 and a DC power supply control device 8 . An anode lifting device 1 is arranged on the upper left side of the ladle 5; the anode lifting device 1 is equipped with high-temperature resistant metal molybdenum ceramic anodes 2, the number is 4, and the anodes 2 are inserted in the slag 3; 2. Adjust the depth of inserting the slag 3 to ensure that the anode 2 is in contact with the slag 3 and not with the molten steel 4; the other side above the ladle 5 is provided with a cathode lifting device 6, and the cathode 7 is installed on the cathode lifting device 6. The cathode 7 is a cylinder with two layers of composite structure inside and outside, the outer layer is wrapped with high temperature resistant cement, and the inside is a graphite rod; the cathode 7 is inserted into the molten ...

Embodiment 2

[0069] The special electrolytic reaction control device of this embodiment is the same as that of Embodiment 1.

[0070] The alumina-rich material used in this example is aluminum ash under the electrolytic aluminum sieve, and its composition is shown in Table 3;

[0071] Table 3 Main chemical composition of aluminum ash under electrolytic aluminum sieve wt%

[0072]

[0073] The magnesium oxide-rich material used in this example is light-burned dolomite, and its composition is shown in Table 4.

[0074] Table 4 The main chemical composition of lightly burned dolomite wt%

[0075]

[0076] Apply this special electrolytic reaction control on 100t ladle for deoxidation alloying operation. The overall control process is: the weight of molten steel in the converter is 103 tons, the C content at the end of smelting is 0.046%, the oxygen content at the end of molten steel is 0.061% (percentage by weight), the temperature of molten steel at the end of smelting is 1707°C; Add...

Embodiment 3

[0079] The special electrolytic reaction control device of this embodiment is the same as that of Embodiment 1.

[0080] The alumina-rich material used in this embodiment is aluminum slag, and its composition is as shown in Table 5;

[0081] Table 5 Main chemical composition of aluminum slag wt%

[0082]

[0083] The magnesium oxide-rich material used in this example is dead-burned magnesium, and its composition is shown in Table 6.

[0084] Table 6 Main chemical composition of dead-burned magnesium wt%

[0085]

[0086] Apply this special electrolytic reaction control on 100t ladle for deoxidation alloying operation. The overall control process is: the weight of molten steel in the converter is 98 tons, the C content at the end of smelting is 0.052%, the oxygen content at the end of molten steel is 0.048% (percentage by weight), the temperature of molten steel at the end of smelting is 1688°C; Add aluminum slag and dead-burned magnesium to molten steel; the amount of...

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Abstract

The invention provides an aluminum-magnesium compound deoxidation alloying method and device. According to the aluminum-magnesium compound deoxidation alloying method, compound deoxidation alloying ofmolten steel is completed through aluminum oxide and magnesium oxide melting electrolytic reduction by means of an electric field. The method comprises the steps of adding an appropriate number of materials containing aluminum oxide and magnesium oxide to slag after completion of converter steelmaking; using molten steel as a cathode, and applying a DC electric field between an inert anode arranged in the slag and the cathode to conduct aluminum oxide and magnesium oxide melting electrolytic reduction reaction, reducing aluminum and magnesium in the aluminum oxide and magnesium oxide and allowing the aluminum and magnesium to get into the molten steel to achieve the purpose of compound deoxidation alloying, wherein oxygen in the aluminum oxide and magnesium oxide has an anode reaction with the inert anode and is discharged and gets into the atmosphere in an oxygen form. The melting deoxidation efficiency reaches 90% or above, and deoxidation products belong to an Al2O3 and MgO complexinclusions and are less than 10 microns in size. Meanwhile, a certain amount of Al and Mg are added to the molten steel. The device is simple, convenient to operate, capable of achieving zero emission of CO2 and achieving the low-carbon and environment-friendly effects and huge in social and economical benefit.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a method and device for composite deoxidation alloying using materials containing alumina and magnesium oxide. Background technique [0002] Deoxidation alloying is one of the basic tasks in steelmaking. In the oxygen top-blown converter, oxygen is supplied from the oxygen lance to the molten steel, which inevitably makes the final molten steel contain excess oxygen. Oxygen, whether in gaseous state, dissolved oxygen state, or in the form of oxides, will reduce the quality of steel. Therefore, after the converter smelting, the molten steel must be deoxidized and alloyed to remove excess oxygen in the molten steel. [0003] Aluminum is currently the most widely used steelmaking deoxidizer, with strong deoxidation ability and high deoxidation efficiency. Deoxidized with aluminum, the formed deoxidized inclusions are fine and dispersed, and are easy to float up an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/36C25C7/00C21C7/00C21C7/06
CPCC21C7/0006C21C7/06C25C3/36C25C7/005Y02P10/134
Inventor 贾吉祥郭庆涛彭春霖李晓伟刘祥唐雪峰廖相巍
Owner ANGANG STEEL CO LTD
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