SU1067046A1 - Method for conducting blast furnace process - Google Patents

Abstract

METHOD OF CONDUCTING DOMAINSEL MELTING, including the change in the chemical system and the costs of slag-forming components of the charge, iron-dried materials, coke H flux, due to the fact that, in order to increase the productivity and economy of melting due to the stabilization of metallurgical cBoiicTB of a shpak, when the number of slag-forming components is over four rlshotl and the dry-pulp compositions of the slag-forming components of the lzmkp y, maintaining constant chemical (L) and stoichiometric (P) charge parameters in the range of 1.93-1.98 and 0.68-0 , 70 respectively etstvenno, P {x This numerical values chemical (dG). stehiometricheosogo and (p) varametrov Nachod t by solving alignment, including tabulated values of ionic radii and atomic charge share chemical elements SH11 wo € times) pkntsih. (L

Description

The invention relates to ferrous metallurgy, in particular to the domain production, and can be used in the smelting

. pig iron in blast furnaces that melt iron from the iron-containing materials of fluxes and coke,

The closest to the proposed technical essence and the achieved result is the method of blast furnace smelting, including changing the chemical composition and costs of slag-forming components of the charge, iron ore materials, coke and flux. In the known method, the costs of slag-forming components of the charge are determined according to the condition of a given basicity of slag, which is found in the chemical composition of slag-forming in tabulated form according to the diagram state 1}. The disadvantages of the known method are

Increased coke consumption and performance degradation due to possible destabilization of the shp parameters as the viscosity of the drop temperature.

The aim of the invention is to increase the productivity and efficiency of smelting due to the stabilization and metallurgical properties of slag.

This goal is achieved by the fact that according to the method of blast furnace smelting, including changing the chemical composition and costs of slag-forming components of iron, ore materials, coke and flux, with the amount of slag-forming components; more than four. The costs and chemical compositions of the slag-forming components change, maintaining the chemical (L2) and stoichiometric (I) parameters of the charge constant within 1.93-1.98 and 0.68-0.70, respectively; (q) and stoichiometric (p) parameters are found by solving equations including taboos. Li values of ionic radii, charges and atomic fractions of chemical elements

sclachy.

J.

The method ensures the formation of such a composition of the charge, in which the decomplar coagulating core remained void or deviated from the minimum specified, which in turn guarantees the stability of its physical and chemical properties, which are of paramount importance for a stable process in the blast-furnace smelting, where a, b, c, d are the mole fractions of the corresponding cations in the Me sublattice, provided that m I, i.e.

P4 1. When recording the composition of the slag-forming part of the charge as Mer O, we get

% -N (e {2o ((0-SiV J 2c. (. O (. Cs)

-Ce me C 9 M

t-i olAe-C-bt otKj (4)

etc. for all parameters included in (O- (2).

According to (4), the values of 2 and Ro in different relations are expressed as a function of interconnected inter-site distances of MHMs and IU-Mv. Therefore, solving system (1) (2) is reduced to determining by successive approximations the value corresponding to a given composition of the mixture. By -e, the parameter is then calculated numerically equal to the average number of electrons localized in the homogeneous oxide melt to the binding orbital X in the direction Me-E: /

f

d e cle e Sa-Os - -lv St-0 b

+ zeAv-0y + dem -ch5) pps5)

The method is carried out as follows.

Parameters are considered optimal and kept constant. When changing the batch conditions or the need to re-blend for technological impact on the blast furnace smelting process, the computer-aided computer-aided data processing system determines the model parameters of possible solvents in order to either minimize their values from the optimal or quantify the effect of these variations on slag properties. melt and smelting rates.

The above is confirmed by the dependences obtained as a result of studies of the array of experimental data and parameters 4c and p

FIG. Figure I shows the relationship between the activation energy of the viscous slag flow and &e; in fig. 2 is a bond, between the temperature of the drop, formation, and; in fig. 3 - dependence of the sulfur content in the slag on p; in FIG. 4, the dependence of the heat capacity on D ..

The connections shown in fig. 13. It is indicated that the stability of such slag properties of viscosity, good flowability and desulfurization properties is ensured at a constant oh and less. These parameters are calculated from the composition of the charge (minus% RegO3) by solving a system of equations:

Nz (e-Me-Ke-e) Ruke / Ro9-0.57-1-107; 6)

2me (mv-e) -2me (Md-Me g

 OM5. otv, r. / "L 4.6b5 CtqMvMa% 7, which is a joint description of the stability conditions of the anionic (E) and cationic (Me) sublattices of the oxide melt. In equations (I) and (2) 2: e and me (charges of anions and cations in E-Me, E-E and Me-Me type), Ru (ion radii in E-Me connection) and chloS. (the characteristics of the chemical identity of the atoms Me and E) are additive values. On their day of determination, multicomponent systems of the type CaO + BiO + AljOs are reduced to the form Ca (xSi (j, AI (.,.

PRI me R. The blast furnace of the Novolipetsk Metallurgical Plant is taken as the basic object. The agglo-factory of the plant produces fluxed manganese sinter with a magnesium content of 2.6-2: 8%. The flux part of the charge consists of a mixture of limestone and dolomite in a 1: 1 ratio. In 1979, in connection with the launch of the blast furnace

volume of 3200 m and a change in security.

Scientific research institutes with iron ore materials of sintering furnaces charge conditions of blast furnaces have changed significantly. The use in the charge of up to 30% sour Lebedin and partially fluxed Mikhailovsky pellets required an increase in the basicity of the agglomerate. . The immense capabilities of the flux crushing departments at the sinter plant and the increase in silica content in the charge are not pos. It is necessary to increase the basicity of the sinter to the level required for the operation of blast furnaces {$ without using flux in the charge. Converter slag is introduced into the charge in the amount of 60 kg / t or more of pig iron (which is close to the maximum permissible phosphorus content in the iron) and, in a number of cases, raw (known). to a decrease in the iron content in the flux mixture of blast furnaces and to the deterioration of the conditions of slag formation due to the addition of fluxing additives. Reducing the negative effect of a change in charge conditions of a sinter plant and blast furnaces using a positive effect of converter furnace; slag on the blast furnace can be achieved

the output of dolomite from the charge, with an increase in the basicity of blast furnace slags in CaO: SiOa by 0.1 dp of the required desulfurization ability. At the same time, the consumption of converter slag should be limited to 40 kg / t of pig iron, and the raw limestone should be excluded from the blast furnace charge.

The feasibility of the proposed technology is evaluated by comparing the model parameters i.e and p defined for the slag flows calculated in two variants with the raw material supply of the plant in the second quarter of 1980.

According to the well-known technology, the basicity of sinter is 1.29; Flihyuv consumption of 230 kg / t, sinter (115 kg of limestone and 115 kg of dolomite); iron ore charge consumption 935 kg / ton sinter; consumption of the converter donkey 49 kg / t of iron; iron content in the ore part of the blast furnace charge 53.51%; the iron content in the fluxed blast furnace charge is 52.32%, the slag yield is 431 kg / t of pig iron. Slag composition: SiOj 38.3; CaO 42.5; AljOj 9.4; MDO 9.1; MPO 0.9; CaO / SiOi 1.11; le -2.19; 0.714.

According to the proposed technology, the basicity of the sinter is 1.35; flux consumption of 194 kg / ton of sinter (limestone); iron ore consumption uiHxtM 954 kg / t sintering mill "erat |; consumption of converter slag 40 kg / t of iron; iron content in the ore part of the blast furnace charge 54.32%; iron content in the fluxed blast furnace charge 53.46%; slag yield of 404 kg / t cast iron. The composition of the spike: SiOj 39.0; CaO 47.8; ACOZ 9.7; MDO 2.7; MPO 0.9; CaO / SiOj 1.22; ei-l, 98; f 0.699.

Thus, the use of the proposed method allows to increase the content of hhlez in the blast furnace charge by 1%, which gives an increase in Production at the plant by 180 thousand tons of pig iron per year while reducing the specific consumption of coke by 4 kg (37 thousand tons in the mountains).

The processing of iron ore feedstocks by the sinter plant will also increase, which will provide the prepared additional production of an additional 125 thousand tons of pig iron per year, reducing the load on the flux crushing units at the sinter plant by reducing the consumption of fluxes and better crushing the lime, resulting in a basic agglomerate better supply of fluxes and elimination of imperfect dosing of the mixture known to - dolomite, to reduce the need. fluxes on 430 thousand tons c. year at the sinter plant and 85 thousand tons in blast furnaces.

f / fofS -fM / Jt / lW l /

Claims (1)

METHOD OF DOMAIN blast furnace entrances of charge, iron ore materials, coke and flux, characterized in that, in order to increase the productivity and economy of smelting due to stabilization of metallurgical properties of slag, when the amount of slag-forming components is more than four, the costs and chemical compositions of slag-forming components are changed, keeping the chemical ( δΧ) and stoichiometric (p) parameters of charge B in the range of 1.93-1.98 and 0.68-0.70, respectively, while the numerical values of the chemical (ds.) and stoichiometric (p) pairs meters found by solving equations including tabulated values of ionic radii