SU1188217A1 - Method of producing agglomerate - Google Patents

Abstract

1. METHOD OF MANUFACTURING AN AGLOMERATE, which includes pretreatment of fuel consisting of parts with different reactivity, water suspension in a binder, mixing, pelletizing, and sintering of the charge, characterized in that the suspension is subjected to a fuel with a lower reactivity and introduced into baking before mixing, and the fuel with a higher reactivity in an amount necessary for its agglomeration is introduced after the batching of the charge. 2. Method POP.1, characterized in that, for every 0.1% g increase in residual carbon in the agglomerate, starting from 3%, the ratio is top (Anyone with a higher reactivity to a fuel with a lower reactivity, starting from 1 , 0, reduce .on 0,02-0,03.

Description

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The invention relates to the technology of preparing raw materials for smelting and can be used in ferrous and nonferrous metallurgy.

The aim of the invention is the production of agglomerate with a given residual carbon content.

According to the invention, the sinter fuel, set in the gaicht, is divided into fuel that goes directly to the sintering process and fuel, which, having undergone physico-chemical traction, will remain in the sinter as residual carbon. The anthracite shtyb, which is a less reactive fuel, is treated with an aqueous suspension in the substance and is fed into the mixture before mixing, as a result of which it coagulates into granules of the mixture, during the sintering process it is subjected to heat treatment and remains in the agglomerate as residual carbon. Coke breeze is served at the end of the pelletizing of the charge in an amount necessary for sintering the charge.

In identical conditions, comparable experiments on the production of sinter with residual carbon were carried out using the proposed method and the prototype method. The speckles are made on a sintering plant with an area of the grate O, 1 m.

The composition of dshkhty. The following,%: ore ZZHRK 8, known to 11-13, fuel (ASH and KM) 7-12, return 22, concentrate YuGOK - the rest. The basicity of the sinter siOj 4 s os

lived in the range of 1.2-1.25.

Anthracite shtyb (C 82%) of the faction 0-3 mm was treated with an aqueous suspension in a substance, which is a mixture of lime and kaolin clay in a 1: 1 ratio; The treatment was carried out until a moistened surface appeared on the fuel. Next, anthracite shtyb mixed with the mixture and pelletized. 30 s before the end of the pelletizing process, coke breeze (C- - 74%) of the 03 mm fraction was supplied to the surface of the granules in an amount necessary for sintering the charge. This amount is determined by the selection of fuel consumption at which the highest technical and economic indicators of the sintering process are obtained. When changing the composition of the charge, it is recommended to adjust the fuel consumption. Then the mixture was sintered. Evaluation of qualitative indicators. Leu process was carried out according to known methods.

The results of sintering are summarized in the table. The data show that the highest technical eecon. The sintering indicators in obtaining a given (3.0–3.5%) residual carbon content in the agglomerate were obtained by feeding 3.8–4.3% anthracite grit before mixing and 3.8 % (optimal content for a given composition of the charge) coke breeze at the end of the pelletizing of the charge. Since the process of obtaining sinter with residual carbon can be characterized by specific unit capacity, the yield of sinter containing fractions of 0-5 mm in the finished sinter and the amount of residual carbon in the drawing shows the dependences of these indicators on the type and amount of fuel supplied before mixing and at the end pelletizing charge. From the graphical dependencies, it can be seen that the optimal ratio of high-reactive / low-reactive fuel is 1.0-0.88. At these boundaries, the highest transfer of charge carbon into residual carbon (K - 0.8) is possible, rather high indicators of specific productivity, yield and content of a fraction of 0-5 mm in the finished sinter while simultaneously obtaining the specified 3.0- 3.5% of residual carbon A change in this ratio of both more than 1.0 and less than 0.88 leads in the first case to the impossibility of obtaining a given residual carbon content, and in the second - to an excessive consumption of fuel per process and a decrease in the charge transfer carbon ratio in balance black carbon (K 0,6-0,5). To obtain the residual carbon content within the proposed limits, a change in the ratio of high-reactive / low-reactive fuel by 0.020.03 results in a change in the residual carbon content by 0.1%. Going beyond these limits does not allow regulating the residual carbon content in the range of 0.1%. ..

Thus, the interval ratio of 0.88-1, O is optimal for obtaining the recommended carbon content of the residual, sufficient productivity of the plant, the yield of the fraction 0-5 mm in the finished sinter with the minimum energy consumption per process. Coke-arriving at the sinter plant. Wet fines and anthracite stubs are stored separately. Subsequently, the hopper of the charge compartment is filled with anthracite grit, which in the process of dispensing from the bunker to the assembly conveyor is processed with an aqueous suspension of a binder (for example, lime and kaolin clay in a 1: 1 ratio). The fuel bins at the drums mark in the sintering compartment are filled with coke breeze.

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1 Fuel consumption, Z 6,87,37,6 7,7 7,8 ObvlL12,0 to mix and (at the end of 3, 03, S3,8 3,9 4,0 nth toshgavo) at the end of the window, 11 (high-grade 3,, 83.8 3.8 3.8 fuel) From the grains: high-reactive / low refractory fuel, 1,271,091.0 0.97. 0.95 d. Hell Soderhlnne in the sinter residual 2,32,63,0 3,1 3,2 carbon, Z 3,0 The coefficient of the transition to toshtiv gmxTti residual carbon of the sinter, Catf - 0,770,740,79 0,795 0,80 C "" tm Sintering time, no 28, 0 16,516,517,5 17,0 17,5 Tdelpa water supply, t / m.h0,8 1,251,31,3 1,35 1,3 Yield of suitable agglomerate, 71,072,073,0 73,0 73,0 Contains fraction O - 5 mm in gpomerate, Z 23.0 23,522.021.0 20.5 20,

} The consumption of fuel supplied to the boom endconfigured by selecting the optimum one for the studied composition.

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The proposed method Sersh experiments 174 The introduction of the proposed method is possible in the conditions of the technological scheme of the sintering plant, working with fuel at the end of the pelletizing of the charge. The invention makes it possible to obtain an agglomerate with the necessary amount of residual carbon, which has a higher reducibility due to the large number of close contacts of carbon with reducible oxides. At the same time, the processes of direct reduction of oxides are developing intensively, which makes it possible to significantly reduce the consumption of domain coke due to the use of less deficient anthracite chips. , 9 8,08, t8,38,89.8If, 8, 1 4,2: 4,3,55,06,08,0,0, 8 3,83,83,83,8 3,83,8, 93 0,910,880,840,760,630 , 48, 3 3,43,53,63,8 3,954, f, 81 0,810 8150,80,760,660,51 8.0 19,519,0 18,521,023,527,0 1,3 1,3 1,251,251,21,00,90,85 74,074,575,074,074,076,077,5 19 5 20,020,521,021,021,521,0 J no 10

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Claims (2)

1. METHOD FOR PRODUCING Agglomerate, including pre-treatment of fuel consisting of parts with different reactivity, an aqueous suspension of a binder, mixing, pelletizing and sintering of a charge, characterized in that, in order to obtain an agglomerate with a given value of residual carbon, treatment with an aqueous suspension the binder is subjected to fuel with a lower reactivity and introduced into the mixture before mixing, and fuel with a higher reactivity in the amount necessary for its spec any, introduced after pelletizing the mixture. 2. The method according to claim 1, characterized in that, for every 0.1% increase in residual carbon in the agglomerate, starting from 3%, the ratio of fuel with a higher reactivity to fuel with less reactivity, starting from 1.0, reduced by 0.02-0.03. SU „„ 1188217 1 11882