SU1342927A1 - Mixture for alloying steel in ladle - Google Patents

Abstract

The invention relates to ferrous metallurgy and can be used in steelmaking in the deoxidation and alloying of mass-graded steel in ladles during removal from steel-smelting units. The aim of the invention is to reduce the consumption of manganese-containing ferroalloys, the cost of doping costs and the improvement of sanitary working conditions. The mixture for steel alloying in the ladle contains wt.%: Slag screening from the production of silicomanganese 25-50 and substandard fines of silicomanganese and / or ferromanganese - the rest. The use of the mixture reduces the consumption of standard manganese-containing ferroalloys to 4.5 kg / ton of steel, reduces the cost of doping to 0.39 rubles / ton of steel and reduces the emissions of pulverized materials at the facility of use by 8-12 mg / m. 1 tab. 4 cl

Description

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(Acquisition of black metal can be done by the company; pilozoic and steelworkers during deoxidation and doping craneii mass mass production during the release from the steel-slab aggregate, the purpose of which.) sanitary working conditions. The proposed mixture for steel alloying in a ladle contains slag screenings from the production of silicomanganese and substandard metallo {silicon manganese and / or ferromanganese in the following ratio of components, m and s. %:

fJTceH iishk from production of silica / 1p1% -1ppa2S-5 (1 Peaconditions silicomanganese and / or ferromanganese trifle {stalflt Is: use.m1.1M slag from npc-ir - in one piece; n1K mm; g a p. a, p azp {g m; th sand from cMjntKOMapraii-cah production, is a product of mechanized processing and distribution in a fraction of the slime of a1g-komargatz, Papa material - slag slag Si.Mti ( sand) s-:; orgit 5-15% kingplant and chagtich ok r- Lrgantseny splanov (/ () - / 2S Mn, 13-17% Si, 0.4-0.5% G and 2.1-2, 3; C), vsl (; the consequence of which is the Kopp, the Center; go March March anpa in it np 4-6 / more gyu cpaBtieHmo with the initial lIIa l, varnish (5p.ch h. screenings contains, wt.h; b ii SiO, 45-50%; CaO - y, AL.O, 5-9%; I, 0, (V.-fi, 0 ;,% ; Nu -} Ji1,5% and Ko 2-; 5 :.

The following screenings are used: nrf-iK: c.; Jji K ;;: iai gaptz in the general list of fg: g: r-c; c; i GV-T laziness metallurgic-h, hp) n and: iij; a coiici those. applied as sand igaka sy. n komargantsa.

The BTopi rM KOMiKJUfHTOM CNaM, ji for ironing steel is a sub-conditional fines of silico-margappa and / or (}) pro-romarghps. This trifle is inhaled by the toxical waste and the result of the crushing of ferro spas: 1 avp1-1x 3aiiCvUix ferrosp giav (margate) and screening in a fraction of m. This waste is used here, on ferro-clav bale; ; tav.r1 yush, her charge in the smelting of ossmzd.dpogo ko: p honor (Ferro margapts or silico marg pcha. Its composition is always known depending on

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from), which pho) K) S11G1av | : shot - (ferromargapep or s-1 pico arganep). Frac1i1 tacos r-1e. 1 och - o j- fine grain-NISTO1T up to 5 mm (-5 mm), crushed and graded.

The mixture 1 was removed by o6i) i4iioro mechanical mixing taken at a given ratio of dry components with

0 and the next loading into the bunker for the rift sticks available in the converter shop. TaKoii additive mixtures in old-fashioned 250-thin buckets are made during the production and melting of smelting (CPS steel) from the converter according to a coordinated team of a production wizard with a distributor. The results of the test; w predicted the composition of the alloying mixture in comparison with NNI1 with the known are given in the table. The best results are achieved when using mixtures 2 and 3 for dosing and dosing. With their relatively low cost (95-115 rubles),

  Partly cheaper than the cost of comarpuncture syrup (282 rubles / ton), we also achieve the corresponding reduction in doping costs (0.3fi-0.39 rubles / ton of steel) and a decrease (dust-like emissions (1214 mg / m) in (compared with the known with g-; e with 11 sh.

(1 on mc / g (| mixture generally depends on the hydrogeptic content of the components, current. In the examples presented in the table, I1: 1H, gp..zuyut materials but chain; oi ceB slag from the production of si- :: III , 1П1, а 3 rub. / R, pekopvidition-: |;: 1stI app, evy alloys

one;; I J O G) p, / G Ustomom Proposition 1 a G a e MO G O ;; i ;. i i. : He mixes the cost of HS b - -glu shits 75-115 rub./t, Rasho ;, a mixture of jyie doping of the article; 1 in examples of testing under conditions of kong, ty. Stert and o, the export is 0.3 - 8.1 kg / t C gali.

With i and ketch pe pat of the macha and ecc of the margins - quiet (ferroalloys (silicomanganese, i | jeppi Mnprainia)) can be explained clearly ij - м mplhmuchsYuYiTsIM and diruyushchim

: v tHiifK: o prg; | /; 1 of the mixture, containing 1, hippo 11NO11 fines of ferroalloys 68-71 / manganese. In addition, the fractional composition of the components of the ley, the rushing 1: mixture (0-5 mm) contributes to

ABOUT

its rapid melting followed by the assimilation of the manganese metal contained in the mixture. At the same time, the rate of assimilation of manganese from the mixture was 3I

It is 81-82 / (rid of the known 80%), which) D) is the absence of insoluble margantz spill from a mixture on the upper layer at the metal – oxidized converter slag boundary. When using a known mixture, melt deoxidation (doping) proceeds mainly due to the base amount of standard manganese-containing ferroalloys (SiMn, FeMn) of 5-50 mm fraction, some of which in some cases do not have time to melt in a timely manner before the occurrence of converter slag. Consequently, the waste of manganese in these swimming trunks is high.

The reduction in doping costs is expressed by releasing and replacing 0.2–4.51 kg / t of steel of standard roads of sparse manganese-containing ferroalloys (for example, SiMn worth 282 rubles / ton) with a relatively inexpensive alloying mixture (0.4–8, 0 kg / t of steel) worth 75-115 rubles / t.

Improving the working conditions and the object of using the doping mixture (determined using filter electrospirators) is associated with a decrease in dust release when using the proposed mixture (10–15 mg / m against 18–22 mg / m in the case of using a known mixture) . This is explained by the optimal proportion of the mixed components of the mixture, which ensures, with good mixing, the homogeneity of the composition, sufficient fluidity along the path of the injection system and penetration into the pores of the slag particles of a certain part of small particles of ferroalloys.

The fractional composition of off-specs of manganese-containing ferroalloys (from fine to 5 mm) does not need additional substantiation, since it proceeds from the requirements of well-known standards for ferroalloys (including crushing, sorting and shipping to consumers). In addition, the lime content (0.4–5%) in the composition of non-conforming fines of manganese-containing ferroalloys is also a stable component, since the pa3Jn-iBKH technology of manganese ferroalloys (on ingots) incorporates the necessary coating of casting equipment with lime mortar. Therefore, these parameters do not require additional justification.

The manufacture of the proposed alloying mixture under production conditions of the operating metallurgical enterprises is technologically advanced and does not require additional capital investments. Implementing it for the bucket deoxidizing-alloying of steel makes it possible to sue: rest the accumulation of waste slag in ferroalloy plants and increase the efficiency of using sub-quality manganese alloys in the steel industry.

Claims (1)

Invention Formula A mixture for the alloying of steel in a ladle containing slag from the production of ferroalloys, so that, in order to reduce the consumption of manganese-containing ferroalloys, the cost of doping pa and the improvement of sanitary working conditions, as slag from the production of ferroalloys, slag refining slag from the production silicomanganese and additionally contains substandard trifle of silicomanganese and / or ferromanganese in the following ratio of components, wt.%: The elimination of slag from the production of silicomanganpa 25-50 Unqualified silicomanganese fines c / or ferromanganeseEstal Editor N. Bobkova Compiled by K. Sorokin Tehred I.Popovich Proofreader A.Zimokosov Order 4605/25 Circulation 549Subscription VNIIGO State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. D. 4/5 Production and printing company, Uzhgorod, st. Project, 4