Desilication demanganization method at same time of preprocessing hot metal
A technology of hot metal pretreatment and silicon manganese removal agent, which is applied in the field of steelmaking technology, can solve the problems of inability to respond flexibly, and the amount of manganese removal cannot meet the requirements of low manganese steel into the furnace.
Active Publication Date: 2008-10-29
BAOSHAN IRON & STEEL CO LTD +1
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Problems solved by technology
However, when the manganese content in blast furnace molten iron is too high, the amount of manganese removed during dephosphorization cannot meet the requirements of low manganese steel.
However, the production characteristics of modern large blast furnaces determine that no matter how fixed the demand for low-manganese hot metal is, blast furnaces cannot flexibly respond to short-term production plans.
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[0072] Equipment: a torpedo tank with a capacity of 320t, filled with 220 to 250t of molten iron. There are 3 powder silos, one for lime, the second for desiliconization and manganese removal agents, and the third for silica sand powder. al 2 o 3 , B 2 o 3 , CaCl 2Additives such as iron oxide can be pre-mixed into materials containing iron oxide and loaded into desiliconization and demanganization agent silos. Each silo is connected to a powder spraying tank respectively. The outer tube of the spray gun uses high-pressure nitrogen, and the inner tube uses nitrogen, oxygen or argon, and the three can be switched freely. There is another auxiliary silo for lump lime. The powder sprayed from the three powder spray tanks is mixed and then connected to the spray gun. When the molten iron is loaded to 110t, insert the spray gun to a depth of 0.45m below the molten iron surface, and adjust the powder spraying speed in three steps according to the aforementioned requirements to...
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The invention relates to a method for hot metal pretreatment and desiliconization as well as demanganization at the same time. The method comprises the hot metal pretreatment, wherein, eluant gas is utilized to spray desiliconization and demanganization agent into hot metal by adopting a powder injection method; a changing basicity method is adopted during the process of desiliconization and demanganization treatment; the SiO2 generating speed in the desiliconization reaction is calculated according to the total desiliconization amount and treatment time; the desiliconization slag basicity is calculated, and the calculating process thereof comprises the following steps: the powder injection treatment time of desiliconization and demanganization is evenly divided into N stages, wherein, N is an integer, and N is more than or equals to 1 as well as less than or equals to 5; at the stage of N, the powder injection rate is adjusted to lead the desiliconization slag basicity in the time segment to satisfy the formula that B equals to (CaO powder injection rate (kg / min)) / (SiO2 powder injection rate (kg / min)+desiliconization SiO2 generating rate (kg / min)), 0.5 to 0.5+1 / N; the temperature of the hot metal pretreatment ranges from 1280 DEG C to 1400 DEG C. The method can perform the desiliconization and the demanganization at the same time, and also can remove a little phosphorus; the hot metal, the initial manganese content of which is more than 0.3 percent, is performed through the powder injection process in a torpedo tank or a foundry ladle, so as to enable the manganese content of the processed hot metal to be less than 0.1 percent.
Description
technical field [0001] The invention relates to the technical field of steelmaking technology, in particular to a method for simultaneous desiliconization and demanganization of molten iron pretreatment. Background technique [0002] Manganese is a beneficial alloying element in steel in most cases, and manganese is an essential alloying component for the strength of structural steel. Therefore, in the general steelmaking process, the oxidation loss of manganese should be avoided as far as possible during refining, so as to reduce the amount of manganese-ferroalloy added when tapping the converter, thereby reducing production costs. [0003] In order to achieve this purpose, the pretreatment of molten iron dephosphorization is widely used at present. A spray gun is used to spray lime-based flux and solid oxygen source iron oxide into molten iron for dephosphorization. The pre-dephosphorized molten iron produces a small amount of Slag can suppress the oxidation loss of manga...
Claims
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Inventor 陈兆平夏幸明李光强朱诚意
Owner BAOSHAN IRON & STEEL CO LTD