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An electric furnace high-efficiency and low-cost smelting process

A low-cost and high-efficiency technology, applied in electric furnaces, process efficiency improvement, furnaces, etc., can solve the problems that the smelting cycle does not achieve the smelting effect, the consumption of steel lime is high, and the iron oxide is high, so as to shorten the smelting time, reduce the consumption of lime, The effect of improving the tapping rate

Active Publication Date: 2022-06-14
YANCHENG LIANXIN IRON & STEEL CO LTD
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AI Technical Summary

Problems solved by technology

[0003] 1. High lime consumption per ton of steel;
[0004] 2. High oxygen consumption;
[0005] 3. High iron oxide in slag;
[0006] 4. The smelting cycle has not reached the expected smelting effect

Method used

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Embodiment Construction

[0024] An electric furnace high-efficiency and low-cost smelting process, which comprises the following steps:

[0025] ——After the smelting of each furnace, 10-15 tons of steel are left in the bottom of the furnace; before this process method, 20-30 tons of steel needs to be kept, and the tapping rate is significantly improved.

[0026] ——Add molten iron into the remaining steel, and the iron mixing speed is 3t / min;

[0027] ——After mixing iron for 0.5-2min, start the medium-flow oxygen supply for 1min, then large-flow oxygen supply, and end the oxygen blowing end time in advance for 0.5-1min, so that the molten steel carbon is always controlled at 0.80% ~ 1.00% before the molten iron is mixed , the carbon of the molten steel at the end point is 0.07%; the existing technical solutions are generally to start oxygen supply immediately after adding iron, and use low flow oxygen supply 500-1000m3 / h for the first 1 minute, and then use large flow oxygen supply 2000-2800m3 / h, The ...

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Abstract

The invention relates to the technical field of steelmaking, in particular to an electric furnace high-efficiency and low-cost smelting process, which comprises the following steps: keeping 10-15 tons of steel at the bottom of the furnace; adding molten iron at a speed of 3t / min; adding iron for 0.5-2min Finally, start to supply oxygen at a medium flow rate for 1 minute, then supply oxygen at a large flow rate, and end the end time of oxygen blowing 0.5‑1 minute ahead of time, so that the carbon of molten steel is always controlled at 0.80% to 1.00% before the molten iron is mixed, and the carbon of molten steel at the end is 0.07%; When mixing 1 / 3 of molten iron in the early stage of melting, add the first batch of lime 200-300Kg, and add the second batch of lime 200-300Kg in the final stage of melting; during the oxidation stage, the molten iron sample is tested, and lime is added in batches according to the P content in the test results. The method provided by the invention significantly reduces lime consumption and oxygen consumption per ton of steel, shortens smelting time, avoids slag outflow in the early stage, reduces heat loss, improves metal yield and tapping rate, and reduces production cost.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to an electric furnace high-efficiency and low-cost smelting process. Background technique [0002] At present, the electric furnace smelting process generally leaves a part of the steel after the steel is tapped, and then begins to mix iron, supply oxygen, and decarburize. Through the analysis of the slag samples in the early stage, this process method has the following problems: [0003] 1. The consumption of ton of steel lime is high; [0004] 2. High oxygen consumption; [0005] 3. The iron oxide in the slag is high; [0006] 4. The smelting cycle has not yet achieved the expected smelting effect. SUMMARY OF THE INVENTION [0007] The technical problem to be solved by the present invention is to provide an electric furnace high-efficiency and low-cost smelting process with low cost, high smelting efficiency and high tapping volume. [0008] The present invention is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52
CPCC21C5/52Y02P10/20Y02P40/40
Inventor 谢锦官谢吉祥刁承民曾锦陈小平张宝富
Owner YANCHENG LIANXIN IRON & STEEL CO LTD
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