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    • 4. 发明专利
    • Method for dephosphorizing refined molten steel in ladle
    • 用于将精炼的轧制钢在水泥中进行脱磷的方法
    • JPS61130414A
    • 1986-06-18
    • JP25243784
    • 1984-11-29
    • Nippon Steel Corp
    • SASAGAWA MASATOMOSAKOMURA RIYOUICHINAKAJIMA MUTSUO
    • C21C7/00C21C7/064C21C7/072
    • C21C7/0037C21C7/064
    • PURPOSE:To oxidize and remove the phosphorus contained in a molten steel subjected to refining by decarburization by putting the molten steel into a ladle, if the content of P therein is above the specified value, then inserting an immersion pipe into the part from which molten slag is removed by blowing an inert gas, adding a dephosphorizing flux to the molten steel and subjecting the molten steel to oxygen blowing. CONSTITUTION:The molten steel 3 is put into the ladle 1 if the content of P in the molten steel after refining is above the specified value and is not accepted in terms of compsn. The inert gas is then blown through a bottom tuyere 2 of the ladle and the molten slag 3a on the surface of the molten steel in raised part is removed as the inert gas rises. The immersion pipe 4 made of refractories is immersed partly into the molten steel 3 in the part where the molten steel surface is exposed after the removal of the molten slag. Oxygen is blown to the molten steel from a lance 5 provided in the upper part of the immersion pipe and at the same time a basic flux such as quicklime or fluorite is added from a storage tank 7 to the molten steel surface by a chute 8. The basic dephosphorized slag contg. iron oxide of >=15% T, Fe is formed to oxidize the phosphorus in the molten steel and to fix the same into basic slag. The molten steel is thus dephosphorized and refined.
    • 目的:通过将钢水放入钢包中,通过脱碳将经过精炼的钢水中所含的磷氧化并除去,如果P中的含量高于规定值,则将浸入管插入熔融 通过吹入惰性气体除去炉渣,向钢水中加入脱磷助熔剂并对钢水进行氧吹。 构成:如果炼钢后的钢水中的P含量高于规定值,则不将钢水3放入钢包1中,不符合要求。 然后将惰性气体吹入钢包的底部风口2,并且随着惰性气体升高,在突起部分的钢水表面上的熔渣3被去除。 在熔融炉渣除去后,熔融钢板表面露出的部分浸渍在熔融钢3中。 氧气从设置在浸入管上部的喷枪5吹入钢水中,同时通过槽8从储罐7向钢水表面添加生石灰或萤石等基本助熔剂。 基本脱磷渣 > = 15%T的铁氧化物,形成Fe以氧化钢水中的磷并将其固定在碱性炉渣中。 钢水脱磷精炼。