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Chromium ore composite pellet used for reduction in argon-oxygen refining furnace, production method and application thereof

A technology of argon-oxygen refining furnace and composite pellets, which is applied in the field of chromium ore composite pellets for argon-oxygen refining furnace reduction, can solve the problems of winding scale defects, large amount of electric furnace slag, and high content of iron oxide in the final slag, and achieve improvement The effect of desulfurization ability

Active Publication Date: 2016-04-20
BAOSTEEL DESHENG STAINLESS STEEL
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Problems solved by technology

However, 5-8% of aluminum powder is added in this invention, and it is applied in 300 series stainless steel, and the generated Al 2 o 3 It is difficult to remove the inclusions in the molten steel, and it is easy to cause 300 series stainless steel coil scale defects; in addition, the converter and electric furnace have a large amount of slag, and the final slag has a high content of iron oxide. The added silicon-calcium alloy powder will be completely oxidized, and the oxidized silicon-calcium alloy Unable to restore Cr in dust removal ash 2 o 3 , resulting in only about 50% chromium yield in the dust removal ash

Method used

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  • Chromium ore composite pellet used for reduction in argon-oxygen refining furnace, production method and application thereof
  • Chromium ore composite pellet used for reduction in argon-oxygen refining furnace, production method and application thereof
  • Chromium ore composite pellet used for reduction in argon-oxygen refining furnace, production method and application thereof

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Embodiment Construction

[0034] A kind of chromium ore composite pellet for argon oxygen refining furnace furnace, its component weight percent is:

[0035]

[0036] Various materials further described are:

[0037] The chrome ore is: preferably, Cr in the chrome ore 2 o 3 The mass percentage content is 40.0~50.0%;

[0038] Metal manganese is: preferably, the mass percentage of manganese is ≥97.0%;

[0039] Ferrosilicon is an iron-silicon alloy made of coke, aluminum powder, steel shavings, quartz (or silica) and smelted in an electric furnace. Preferably, the mass percentage of silicon in ferrosilicon is ≥72.0-80.0%, and the mass percentage of carbon is ≤0.50%;

[0040] Calcium metal is obtained by using limestone as raw material, aluminum powder as reducing agent, and processing after cooling by vacuum reduction method. Preferably, the mass percentage of calcium is ≥97.0%;

[0041]The binder is: sodium methyl cellulose, other binders are easy to cause carburization of molten steel.

[0042]...

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Abstract

The invention provides a chromium ore composite pellet used for reduction in an argon-oxygen refining furnace, a production method and an application thereof. The chromium ore composite pellet includes the following components, by weight, 40-52% of chromium ore, 10-25% of metal manganese, 10-25% of silicon iron, 5-12% of metal calcium and 4-6% of a binder. Strong reduction agents, the metal manganese and the metal calcium, are added to the chromium ore composite pellet, so that dissolution of chromium ore is accelerated, desulfurization of slag is improved and yields of chromium and manganese in the chromium ore composite pellet are increased. The chromium ore composite pellet is added when oxygen blowing for decarbonization is finished in the argon-oxygen refining furnace, wherein the addition amount of the chromium ore pellets is accurately calculated through surplus heat of molten steel in the argon-oxygen refining furnace, so that peroxidation of the molten steel of stainless steel is effectively prevented. The yields of the chromium and manganese in the chromium ore composite pellet reach more than 90%. Consumption of reduced silicon iron is not influenced.

Description

technical field [0001] The invention relates to a raw and auxiliary material for iron and steel metallurgy, a new type of alloy material used for chromium alloying in the stainless steel smelting process and a production method thereof, in particular to a chromium ore composite pellet for reduction in an argon-oxygen refining furnace and its production methods and applications. Background technique [0002] Chromium (Cr) is an indispensable element in stainless steel and the most important alloying element in stainless steel. At present, the material used for chromium alloying in the steelmaking process of argon oxygen refining furnace is chromium ferroalloy, which is smelted from chromium ore to ferrochrome alloy, which causes great environmental pollution in the whole production process, energy consumption and production higher cost. With the development of steelmaking technology, there has been a smelting process in which chromium ore is directly alloyed in converters a...

Claims

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Application Information

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IPC IPC(8): C22B1/242C21C7/064
CPCY02P10/20
Inventor 池和冰徐文杰邵世杰郑皓宇徐晓华张海清
Owner BAOSTEEL DESHENG STAINLESS STEEL
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