Chromium ore composite pellets for reduction in argon-oxygen refining furnace and its production method and application
A technology of argon-oxygen refining furnace and composite pellets, which is applied in the field of chromium ore composite pellets for reduction in argon-oxygen refining furnaces, can solve problems such as winding scale defects, high iron oxide content in final slag, and inability to reduce, so as to improve the removal rate The effect of sulfur capacity
Active Publication Date: 2018-05-08
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
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[0034] A kind of chrome ore composite pellet for argon-oxygen refining furnace, the weight percentage of its components is:
[0035]
[0036] The various materials further described are:
[0037] The chrome ore is: preferably, Cr in the chrome ore 2 O 3 The mass percentage is 40.0 to 50.0%;
[0038] The 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 scrap, quartz (or silica) as raw materials and smelted in an electric furnace. Preferably, the mass percentage content of silicon in the ferrosilicon is ≥72.0-80.0%, and the mass percentage content of carbon is ≤0.50%;
[0040] The metal calcium is obtained by using limestone as raw material and aluminum powder as reducing agent, which is obtained after cooling by a vacuum reduction method. Preferably, the mass percentage of calcium is ≥97.0%;
[0041]The binder is: sodium methyl cellulose, and other binders are...
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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 used for iron and steel metallurgy, a novel alloy material used for chromium alloying in a stainless steel smelting process and a production method thereof, in particular to a composite pellet of chromium ore 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 steel-making process of argon-oxygen refining furnace is chromium-based ferroalloy, which is smelted from chromium ore into chromium-containing ferroalloy, 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 ...
Claims
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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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