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Calcium aluminate for desulfurization of ultralow titanium and carbon steel and preparation method thereof

A calcium aluminate and ultra-low titanium technology is applied in the field of steelmaking and refining, which can solve the problems of carburizing and titanium increasing in molten steel, and achieve the effects of controlling the amount of carburizing, fast slag formation, and good desulfurization effect.

Active Publication Date: 2014-04-02
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As mentioned above, the existing calcium aluminate desulfurizers cannot meet the desulfurization requirements of ultra-low titanium and carbon steel, and will cause carburization and titanium increase in molten steel during use

Method used

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  • Calcium aluminate for desulfurization of ultralow titanium and carbon steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Add raw materials according to the following weight percentages: CaO: 61%, Al: 39%. The particle size of CaO is 0-10mm, and the particle size of Al is 0-10mm.

[0020] (2) The raw material granules are mechanically mixed in a mixer, and the mixing time is 2 hours.

[0021] (3) Put the mixture into the melting furnace, and then inject fuel oil for heating. The calorific value of the fuel oil is 41900 kJ, the weight percentage of the sulfur content is less than 1.2%, and the temperature of the furnace is raised to 980°C.

[0022] (4) Inject oxygen into the furnace for smelting. The melt was warmed to 1470°C.

[0023] (5) Take it out of the oven, cool it down, and crush it for use. When the temperature is above 1400°C, control the cooling rate to 4°C / min. The finished product specification is 5-10mm.

[0024] Through the above operations, the calcium aluminate composition of the gained is (% by weight): Ca 12 Al 14 o 33 : 95.11%, Ca 3 Al 2 o 6 : 1.82%, Ca ...

Embodiment 2

[0026] (1) Add the following raw materials according to the following weight percentages: CaO: 63%, Al: 37%. The particle size of CaO is 0-7mm, and the particle size of Al is 0-7mm.

[0027] (2) The raw material granules are mechanically mixed in a mixer, and the mixing time is 2.5 hours.

[0028] (3) Put the mixture into the melting furnace and then inject fuel oil for heating. The calorific value of the fuel oil is 42200 kJ, the weight percentage of the sulfur content is less than 1.2%, and the furnace temperature is raised to 1005°C.

[0029](4) Inject oxygen into the furnace for smelting. The temperature of the melt was raised to 1480°C.

[0030] (5) Take it out of the oven, cool it down, and crush it for use. When the temperature is above 1400°C, control the cooling rate to 3°C / min. The finished product specification is 5-15mm.

[0031] Through the above operations, the calcium aluminate composition of the gained is (% by weight): Ca 12 Al 14 o 33 : 95.39%, Ca 3...

Embodiment 3

[0033] (1) Add the following raw materials according to the following weight percentages: CaO: 64%, Al: 36%. The particle size of CaO is 0-5mm, and the particle size of Al is 0-5mm.

[0034] (2) The raw material granules were mechanically mixed in a mixer, and the mixing time was 3.5 hours.

[0035] (3) Put the mixture into the melting furnace and then inject fuel oil for heating. The calorific value of the fuel oil is 43210 kJ, the weight percentage of the sulfur content is less than 1.1%, and the temperature of the furnace is raised to 1010°C.

[0036] (4) Inject oxygen into the furnace for smelting. The melt was warmed to 1490°C.

[0037] (5) Take it out of the oven, cool it down, and crush it for use. When the temperature is above 1400°C, control the cooling rate to 3°C / min. The finished product specification is 5-25mm.

[0038] Through the above operations, the calcium aluminate composition of the gained is (% by weight): Ca 12 Al 14 o 33 : 96.67%, Ca 3 Al 2 o ...

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Abstract

The invention relates to calcium aluminate for desulfurization of ultralow titanium and carbon steel and a preparation method thereof. The calcium aluminate comprises more than or equal to 94% of Ca12Al14O33, less than or equal to 2% of Ca3Al2O6, less than or equal to 2% of Ca2SiO4, less than or equal to 1.5% of MgO, less than or equal to 0.01% of pure Ti and less than or equal to 0.02% of pure carbon. The preparation method comprises the following steps of: (1) preparing materials according to the following proportions: 60-65% of CaO and 35-40% of Al; (2) mixing the proportioned raw material particles in a material mixer; (3) adding the mixed materials into a smelting furnace, and blowing fuel to heat the furnace to make furnace temperature achieve 950-1050 DEG C; (4) blowing oxygen into the furnace, heating the furnace body to 1450-1500 DEG C; and (5) cooling and crushing premelted slag into 5-30 mm blocks. The desulfurizing agent provided by the invention has the advantages of low production cost, easy for storage, low melting point, high slag melting speed, high desulfurization effect and small corrosion to refractory materials, and the carbon increase amount and the titanium increase amount of liquid steel can be effectively controlled.

Description

technical field [0001] The invention belongs to the steelmaking and refining technology, and in particular relates to a premelted calcium aluminate desulfurizer for desulfurizing ultra-low titanium and ultra-low carbon steel and a preparation method thereof. Background technique [0002] With the development of engineering technology, the requirements for the performance of steel are getting higher and higher. Usually, sulfur in steel is a harmful element. If it cannot be effectively removed during the smelting process, it will seriously restrict the performance of steel. Therefore, currently in industrial production, a certain amount of desulfurizer is usually added in the molten steel refining process to remove sulfur. [0003] There are many types of desulfurizers. Calcium aluminate is widely used as a desulfurizer in steelmaking because of its low melting point, high sulfur capacity and easy storage. However, for some steel types that require extremely low titanium and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 尚德礼林洋李德刚廖相巍吕春风康磊邓伟
Owner ANGANG STEEL CO LTD
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