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Iron-carbon synthesized block and its application

A technology for synthesizing blocks and iron-carbon, which is applied in the field of iron-carbon synthesis blocks, can solve problems such as the difficulty in controlling the carbon content at the end point, increase smelting costs, and reduce the quality of steel billets, so as to achieve obvious economic and social benefits and avoid boiling of molten steel Phenomenon, the effect of improving the quality of molten steel

Inactive Publication Date: 2006-09-06
卞安生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the former increases the smelting cost, and at the same time, the inclusions existing in the molten steel in the form of silicon and aluminum deoxidation products increase, which reduces the quality of the billet and even leads to the scrapping of the billet
And because the density of this kind of material is lower than that of steel slag in the furnace, when adding carbon, a small part is sucked by the dust removal system, and most of it floats on the steel slag and is burned. Stable, it is difficult to control the carbon content of the end point
When carbon powder is added to the ladle when the molten steel is tapped, it is easy to cause strong boiling of the molten steel. In severe cases, a large amount of molten steel will be splashed, destroying the molten steel truck, etc., resulting in loss of molten steel and production stoppage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The iron powder and carbon powder are 33% and 67% according to the following weight ratio, and the above-mentioned weight ratio of 2 to 3% of the total amount of corn starch is added as a binder, and the mixture is stirred, mixed, pressed or rolled into a ball, And air-dried or oven-dried to make a density of 3.0g / cm 3 , Iron-carbon synthetic balls with a particle size of 80mm. The test results on the electric arc furnace show that adding 5-8kg of such iron-carbon synthetic balls per ton of steel will increase the carbon content at the end of the molten steel by 0.01-0.02%.

Embodiment 2

[0027] The iron powder and carbon powder are mixed according to the following weight ratios of 60% and 40%, respectively, and are stirred, mixed, pressed into balls, and dried or dried to make a density of 4.2g / cm 3 , Iron-carbon synthetic balls with a particle size of 40mm. The test results on the electric arc furnace show that adding 3-4kg of such iron-carbon synthetic balls per ton of steel increases the carbon content at the end point of molten steel by 0.03-0.04%.

Embodiment 3

[0029] The iron powder and carbon powder are 90% and 10% according to the following weight ratio, and the tar pitch of the above-mentioned weight ratio total amount of 3-4% is added as a binder, and the mixture is stirred, mixed, pressed or rolled into a ball, And air-dried or oven-dried to make a density of 5.5g / cm 3 , Iron-carbon synthetic balls with a particle size of 10mm. The test results on the electric arc furnace show that adding 8-10kg of such iron-carbon synthetic balls per ton of steel will increase the carbon content at the end point of molten steel by 0.01-0.02%.

[0030] It can be seen from the above examples that the carburizing effect of Example 2 is the largest, and at the same time, the comprehensive smelting effects of reduced production costs, reduced inclusions in molten steel, and shortened refining time are obtained. Do not add cornstarch in this embodiment, its consumption is little in fact, just in order to increase cohesiveness, be convenient to mold...

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PUM

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Abstract

The invention relates iron-carbon compound block made by iron powder and carbon powder, using to improve carbon content in the course of electric-arc steel furnace, converter, tapping and refining treatment. The proportion by weight is following: 33-90% iron powder, 10-67% carbon powder, 10-80mm particle diameter, 3.0-5.5g / cm3 denseness, 2-4% binding agent. Using the method, the molten steel carbon content is increased by 0.03-0.04%, the dissolved oxygen content is decreased by more than 50ppm; the iron oxide content in steel slag is decreased by 6-8%, after tapping,silicon and aluminium content increased by 12-15%; the steel cost per ton is decreased by 5.3 yuan. The method guarantees the safety in production, and shorts the refining treatment cycle.

Description

technical field [0001] The invention relates to an iron-carbon synthetic block made by mixing iron powder and carbon powder, which is used in a steelmaking furnace to increase the carbon content of molten steel. Background technique [0002] At present, electric arc furnace steelmaking is developing in the direction of high efficiency and energy saving. A large amount of scrap steel is used as raw material, and by blowing a large amount of oxygen into the furnace, the chemical reaction heat generated by the oxidation of carbon, silicon and other elements in the scrap steel is used to achieve the purpose of energy saving and high efficiency. However, since the carbon content in scrap steel cannot be determined, a large amount of oxygen is blown in during the smelting process, which results in the disadvantages of increased dissolved oxygen content and low carbon content in molten steel. In order to overcome the above defects, a large amount of deoxidizers such as silicon and...

Claims

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Application Information

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IPC IPC(8): C21C5/00C21C7/00
Inventor 卞安生
Owner 卞安生
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