SU1507826A1 - Method of producing complex flux - Google Patents

Abstract

The invention relates to ferrous metallurgy and can be used for smelting steel in converters. The aim of the invention is to reduce the consumption of pig iron and increase the proportion of scrap in converter smelting due to an increase in the residual carbon content in the flux. In order to implement the method, pre-moistened solid fuel with a grain size of 3-10 mm rolls sludge and then dosing, mixing, moistening charge materials, ignition and sintering are carried out. Preparation of the batch of the present method permits to increase the content of residual carbon (C * _ost 981.0%). With a residual carbon content of 5.26%, the use of complex flux in converter smelting led to a decrease in the specific consumption of pig iron by 25 kg / t of steel and an increase in the specific consumption of scrap by 25 kg / t of steel. 2 hp f-ly, 2 tab.

Description

The invention relates to ferrous and metallurgy and can be used for smelting steel in converters.

The purpose of the invention is to reduce the consumption of iron and increase the share of scrap in converter smelting due to an increase in the content of residual carbon in the flux of

Example. The mixture to obtain the specified composition of the complex flux with 5% residual carbon contains,%: limestone to 34.26; dolomite converter sludge 24.61;

return 19.84; solid fuel 12.47; K 0.645 and the yield of 8.22 kg.

The amount of suitable fuel with a particle size of 3-10 mm was determined on the basis of the specified residual carbon content in the ferromagnetic complex flux by the expression

m

     one..

 075l7x67545 TOO

 0.780 kg

-Where m - the amount of coarse solid fuel krupnostt to

3 - 10 mm, kg;

3.1507826

With pj. - residual carbon content in the complex flux,%;

  the amount of suitable complex flux after sintering, kg;

C is the content of nonvolatile carbon in solid fuel, in the amount of. 10 K is the coefficient characterizing the amount of solid fuel with a particle size of 3–10 mm that does not burn during sintering, is only 15 The amount of sludge required for the formation of a shell with a thickness of 1.0 - 1 , 5 mm, determined by forum

y m

G

5m

n

VI p

" one

Ide G - thickness of rolled slurry - 25

howl shell, cm; apparent density of solid fuel with a particle size of 3-10 mm,

sludge density in the nlcatane state, g / cm; P is the mass of combustible sludge, g; P is the mass of lumping material, g; d is the average diameter of a ball.

th material, see

The amount of sludge required - l pelting fuel, equal to

etc,

bs K Jdt RM - „- 0.6

 0.102 kg

I -.

which is 60% of the mass of the coarse fuel particle with an average diameter of 6 mm.

Large fuel was moistened, mixed with sludge in the ratio of 40:60 and pelleted. Then, the rest components of the charge were dosed, mixed, moistened and pelletized together with rounded large fuel. Then the mixture was loaded into the bowl and sintered ..

Technological indices of the complex-ifflH complex flux in table about 1.

From the data table. 1 that in the vacuum sintering and agglomeration method

five

°

five

0 5

0

five

0

five

pre-pelletizing of solid fuel allows to obtain a given amount of residual carbon in the complex

flux (C

osg,

 4.73% with vacuum

agglomeration and 5.26% during sintering under pressure).

Technological parameters of the experimental converter heats are given in table. 2

Claims (2)

1. A method for producing a complex flux, including mixing the components of the charge, moistening the charge materials, ignition and sintering, characterized in that In order to reduce the consumption of pig iron and increase the share of scrap in converter smelting by increasing the content of residual carbon in the flux, sludge is preliminarily moistened with solid fuel with a size of 3–10 mm. 2. A method according to claim 1, characterized by the fact that the amount of solid fuel with a particle size of 3-10 mm is determined on the basis of the specified residual carbon content in the complex flux by the expression g. R , - stop   K 100 where m is the amount of solid fuel size 3-10 mm, kg; OST residual carbon content in the complex flux,%; P years and the number of suitable complex flux after sintering, kg;  non-volatile carbon content in solid fuels K - coefficient characterizing the amount of solid fuel with a particle size of 3-10 mm, which does not burn during sintering, should be equal to 12.3 12.3 12.47 12, A7 O40 fr. 3-10 mm 14.01 12,314,0114,01 12.4712.4712.47 40 fr. 40 fr.40 fr 3-10 mm with 3-10 mm3-15 mm with rolling-with rolling-rolling. tshaniem Specific consumption of iron ,. kg / t of steel Specific consumption of scrap, kg / t of steel Specific consumption of lime, kg / t of steel table 2 812 787 312.3 337.3 43.7 43.7 5 efficient consumption of complex flux, kg / t steel Specific oxygen consumption, Composition of iron Sio Mp S Pig iron temperature, ° С Composition of metal on a bulk,%: WITH M S R Temperature meth la s The composition of the slag,% Feo BiOg. Cao MgO CaO / SiO Purge time, min The cooling effect of complex flux, kJ / k thirty thirty 52.0 0.74 0.50 0.024 1370 1375 0.04 0.13 0.023 0.011 645 16.5 17.9 50.8 2.0 2.84 14.9 0.04 0.11 0.020 0.011 1650 16.2 18.3 50.3 2.0 2.75 15.0 3283.52 2572.22