Al-Ca matter converter slag deacidizing modifier

A converter slag and modifier technology, applied in the field of steelmaking and refining, can solve the problems of increasing the probability of white spot defects in steel, reducing the basicity of refining slag, affecting refining effect, etc., achieving high comprehensive utilization rate, reducing smelting cost, good effect

Inactive Publication Date: 2008-05-14
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are disadvantages in each: the use of bentonite will reduce the alkalinity of refining slag and affect the refining effect; when organic matter such as starch is added to molten steel, it will increase the h

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0013] Example 1:

[0014] Raw material preparation, prepare aluminum powder with 99% Al content, CaC 2 75% calcium carbide and 92% CaO active lime as raw materials;

[0015] Ingredients: the above-mentioned raw materials are mixed in proportions of 37% aluminum powder, 48% calcium carbide, and 15% active lime;

[0016] After mixing, the prepared raw materials are fully stirred and mixed with a mixer to become the Al-Ca converter slag reduction modifier of the present invention.

Example Embodiment

[0017] Example 2:

[0018] The ingredients are mixed, the aluminum particles with 95% Al content, CaC 2 The calcium carbide powder with a content of 89% and the lime powder with a CaO content of 92% are mixed in the proportions of 42% of aluminum particles, 35% of calcium carbide, and 23% of active lime, and are mixed evenly with a mixer.

[0019] Press block molding, put the mixture in a closed system, without adhesive, press molding under a pressure of 30-35MPa, the composite slag ball is ¢15~¢40mm-like sphere.

[0020] After the converter steel is tapped, the Al-Ca converter slag reduction modifier of the present invention is added to the molten steel surface, and the added amount is determined by calculation and experiment according to the requirements of the refining station on the oxygen potential of the ladle slag.

[0021] After a 200-ton converter, the Al-Ca converter slag reduction modifier was added at an amount of 200kg / furnace to prove that:

[0022] 1. Regardless of ...

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PUM

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Abstract

The invention relates to a deoxidization modifier of Al-Ca converter slag, which is a mixture compounded by or is a complex slag ball pressed by 15 percent to 35 percent of active lime, 35 percent to 50 percent of calcium carbide, 35 percent to 50 percent of aluminum powder (or aluminum grain, aluminum scrap and aluminum line segment) according to the weight ratio. Since the aluminum powder and active CaO are mixed with CaC2, no adhesives or additives are used, so additional pollution to molten steel does not exist, which is in favor of improving the quality of excellent and special steel and being no damage for ladle lining refractory materials; the aluminum has high comprehensive utilization rate, the deoxidation effect of the converter slag is good, the slag amount is low and the slag forming is fast. Because no moisture contains in raw materials, the active CaO and CaC2 can not be hydrated and the reaction ability thereof can not be decreased, thus ensuring the functions and effect thereof; the molten steel has high cleanliness and no water gap nodulation after 5 continuous casting heats.

Description

technical field [0001] The invention belongs to the field of steelmaking and refining, and in particular relates to an Al-Ca reducing and modifying agent used for eliminating final slag oxidation after tapping from a converter. Background technique [0002] Eliminating and controlling the highly oxidizing slag brought into the ladle when the converter is tapping is an important link in the production of clean steel, and it is also one of the key technologies to realize the high efficiency of the secondary refining furnace. If a lot of slag with high FeO+MnO content is brought into the ladle, it will not only deteriorate the operating conditions of secondary refining, but also deteriorate the cleanliness of molten steel and increase the cost of steelmaking production. When producing steel grades with high quality requirements, some steel mills use a slag remover to remove the oxide slag in the ladle. The slag removal often causes many losses such as co...

Claims

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Application Information

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IPC IPC(8): C21C7/04C21C7/06
Inventor 于赋志沈峰满陈明王文仲温铁光孙群赵雷
Owner ANGANG STEEL CO LTD
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