Pre-deoxygenated synthetic pellet for steel making in electric arc furnace and its making process

A pre-deoxidation and electric arc furnace technology is applied in the field of deoxidizer with slag in the electric arc furnace steelmaking furnace, which can solve the problems of high consumption of deoxidizer alloy, increase production cost, reduce steel purity and other problems, so as to reduce the consumption of deoxidizer, The effect of improving the yield of alloy and reducing the burden of deoxidation

Inactive Publication Date: 2008-08-13
天津新技术产业园区津良科技有限公司
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Problems solved by technology

At present, after the initial smelting of the electric arc furnace is completed, part of the deoxidizer is added during the tapping process for deoxidation, and the deoxidizer is added when the oxygen content of the molten steel is high. The consumption of deoxidizer and alloy is high, which increases the production cost. The use of excessive deoxidizer, especially alloy deoxidizer, will produce inclusions in molten steel, reduce the purity of steel, and affect the quality of steel.

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  • Pre-deoxygenated synthetic pellet for steel making in electric arc furnace and its making process

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Embodiment Construction

[0019] 1. Source of raw materials

[0020] The raw materials of the electric arc furnace steelmaking pre-deoxidation synthetic balls are all commercially available products, which can be purchased directly from the market.

[0021] 2. The weight percentage of each raw material in the electric arc furnace steelmaking pre-deoxidation synthetic ball batching:

[0022] Calcined petroleum coke with carbon content ≥ 98.5% 26%,;

[0023] Steel grit with iron content ≥ 96%, phosphorus content < 0.11% and sulfur content < 0.04% 70%;

[0024] Composite binder composed of 90% sodium silicate and 10% industrial starch by weight percentage 3%;

[0025] Graphite powder 1%.

[0026] 3. the manufacture method of above-mentioned electric arc furnace steelmaking pre-deoxidation synthetic ball comprises the following steps successively:

[0027] (1) finely crushing: using a pulverizer to crush the calcined petroleum coke into a fine powder whose particle size is below 1 mm;

[0028] (2) Pre...

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Abstract

The present invention relates to pre-deoxygenating synthetic pellet for steel making in electric arc furnace and its making process. The pre-deoxygenating synthetic pellet is made with calcined petroleum coke possessing 98.5 % over carbon content in 24-28 wt%, steel grit possessing 96 % over Fe, 0.11 % below P and 0.04 % below S in 68-72 wt%, composite adhesive in 3-4 wt% and graphite powder in 0.8-1 wt%. The making process includes the following steps: pulverizing, compounding composite adhesive, mixing material, kneading, extruding to form pellet and stoving. The pre-deoxygenating synthetic pellet is used in pre-deoxygenating molten steel to reduce the deoxygenating burden of the fining furnace in the reducing stage, eliminate inclusion, ensure steel quality and lower production cost.

Description

technical field [0001] The invention relates to a deoxidizer with slag in an electric arc furnace steelmaking furnace, in particular to an electric arc furnace steelmaking pre-deoxidation synthetic ball and a manufacturing method thereof. Background technique [0002] In the modern ultra-high-power electric arc furnace steelmaking process using scrap steel and molten iron as raw materials, oxygen is usually blown into the furnace and ore is added for primary oxidation to remove impurity elements such as carbon and phosphorus in the steel. As the blowing progresses, the carbon content in the steel decreases and the oxygen content gradually increases, so that the oxygen content in the molten steel greatly exceeds the allowable value of the finished steel. Therefore, after the primary oxidation smelting, try to reduce the oxygen in the molten steel. content. At present, after the initial smelting of the electric arc furnace is completed, part of the deoxidizer is added during ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C22B1/14
Inventor 钱自良
Owner 天津新技术产业园区津良科技有限公司
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