SU945179A1

SU945179A1 - Method for converting low-manganese cast iron

Info

Publication number: SU945179A1
Application number: SU792716110D
Authority: SU
Inventors: Серафим Васильевич Колпаков; Петр Иванович Югов; Александр Михайлович Поживанов; Борис Александрович Бурдонов; Вячеслав Васильевич Рябов
Priority date: 1979-01-22
Filing date: 1979-01-22
Publication date: 1982-07-23

Description

1one

Изобретение относитс к металлургии, конкретнее к производс: -ву стали в кислородных конвертерах, и может быть использовано при переделе низкомартанцовистого чугуна.The invention relates to metallurgy, more specifically to the production of: steel in oxygen converters, and can be used in the redistribution of low-manganese iron.

Известны способы рафинирювани , при которых марганецсодержащий материал и известь присаживают в течение 1-2 мин после начала продувки 1.Known methods of refining, in which the manganese-containing material and lime sit down for 1-2 minutes after the start of blowing 1.

Наиболее близким по технической сущности и достигаемому результату к изобретению вл -,д етс способ производства стали в кислородном конвертере, включающий завалку скрапа, заливку чугуна, присадку извести, плавикового шпата, марганцевой руды и продувку ванны кислородом, при осуществлении которого из- jj весть и плавиковый шпат ввод т последовательными порци ми по ходу продувки, а марганцевую руду присаживают по истечении 2/3 длительности продувки и не позже. чем за 4 мин до окончани продувки в количестве, опреде- 20 л емом заданным содержанием марганца в конечном металле 2.The closest in technical essence and the achieved result to the invention is a method of steel production in an oxygen converter, including filling of scrap, pouring of cast iron, lime, fluorspar, manganese ore additive and oxygen bath blowing, in which I know. The fluorspar is introduced in successive portions along the course of purging, and manganese ore is seated after 2/3 of the duration of the purge and no later. than 4 minutes before the end of the purge in an amount determined by 20 times the specified manganese content in the final metal 2.

Недостатком известного способа вл етс неудовлетворительное шлакообразование вThe disadvantage of this method is unsatisfactory slag formation in

первом периоде, заметалливание фурм и кессонов , и как следствие, повышенные простои конвертеров.the first period, sweeping of tuyeres and caissons, and as a result, increased downtime of converters.

Цель изобретени - улучшение шлакообразовани и экономи ферромарганца.The purpose of the invention is to improve slag formation and save ferromanganese.

Поставленна цель достигаетс способом передела низкомарганцовистого чугунг с содержанием марганца менее 0,37с в конвертере, включающим завалку скрапа, заливку чугуна, присадку извести, разжижителей, марганецсодержащего материала и продувку ванны кислородом , марганецсодержащий материал в количестве 15-30 кг/т присаживают в завалку в количестве 70-80% от общего расхода, обеспечивающем содержанием МпО в первичном щлаке 12-30%, а остальную часть в количестве 30-20% от общего расхода ввод т по истечении 50-60% длительности продувки.The goal is achieved by the method of redistribution of low-manganese iron with a manganese content of less than 0.37s in the converter, including filling of scrap, pouring pig iron, lime additive, thinners, manganese-containing material and blowing the bath with oxygen, manganese-containing material in the amount of 15-30 kg / ton is placed in the tank. the amount of 70-80% of the total flow rate, providing 12-30% MpO content in the primary section, and the rest in the amount of 30-20% of the total consumption is entered after 50-60% of the purge duration.

Claims

PRI im p 1.5 tons of scrap, 160 kg of manganese sinter with manganese content (50.4%, 9.1 tons of cast iron with content,%: 0.18 manganese; 0.60 silicon; 0.10 phosphorus; 0.10 tons) are poured into a 10-ton converter; 0.034 of sulfur. In the first minute of the blowdown, 400 kg of lime are sown, in the third minute, 10 kg of fluorspar. After 5 minutes of blowing, slag is obtained with the content: 20.2 MpO; 34.8 CaO; 24.6 SiOj; 12.1 FeO The degree of assimilation of lime is 51.1%, the basicity of slag is 1.41. In the sixth minute of the blowdown, 200 kg of lime are sown, after 8 minutes (50% of the time of purging) during the maximum speed of both carbonization 40 kg of manganese agglomerate (20% of the total consumption) and 15 kg of fluorspar spat out. For 11 and 14 minutes, 100 kg of lime are sown. The duv is finished after 16 minutes of concentration,%: 0.07% carbon; 0.35 manganese ; 0.016 sulfur; 0.08 phosphorus; 0.04 oxygen. The degree of utilization of manganese is 27.4%. With the specified mode of addition of slag-forming materials, despite the low flow of fluorspar, blowing occurs, the removal of the tuyere is achieved without removal and sweeping of the tuyere high degree of lime assimilation in the primary 1H1a, oxidation of the metal The rest is narrower, as well. the degree of utilization of manganese is obtained higher (27.4-30.5% than with an additive of 94 single portions per filling or at the beginning of the purge 22.4%). For the purpose of more complete reduction of manganese, at the end of the purge, the lance is lowered by 200-300 mm, and as a rule, lime in the amount of 100-200 kg, i.e. up to 15% of total consumption. The method of conversion of low-manganese iron with a manganese content of less than 0.3% and a converter, including filling of scrap, pouring of cast iron, lime additive, thinner, manganese-containing material and blowing oxygen through the bath, characterized in that, in order to improve slag formation and saving, it is necessary to produce a man. the material is set down in the filling in the amount of 70-80% of its total consumption, and the rest of the manganese-containing material is injected after 50-60% of the duration of the purge. Sources of information taken into account in the examination 1. US patent number 3897244, cl. 75-53, published. 1973.

2. USSR author's certificate number 293441, cl. C 21 C 5/28, 1969.