JPS58164734A - Sintering method of ore - Google Patents

Abstract

PURPOSE:To manufacture a sintered ore having stable quality at the minimum blending amount of coke by sintering after controlling the blending amount of coke in a sintering raw material on a continuously moving pallet corresponding to an atmospheric moisture. CONSTITUTION:In the operation of endless continuous sintering machine, factors such as C.Rkg/t coke unit, SiO2%, FeO%, Al2O3% in the product and Ng/Nm<3> moisture in the air sucked from the pallet bottom have a correlation of following multiple regression equation (RDI)=-0.132(C.R)-3.29(SiO2)-2.07(FeO)-14.93 (Al2O3)+0.353N+94.44 against a reduction decomposition index RDI indicating a sintered ore quality and the partial correlation coefficient of N is the highest to RDI. Thus, the coke unit C.R necessary for obtaining the desired RDI corresponding to the moisture N in the air is obtained from the above-mentioned equation and the blending amount of coke is controlled. Thereby, the sintered ore having the desired quality can be obtained stably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for sintering ore, and more specifically, the present invention relates to a method for sintering ore.
The present invention relates to a method for sintering ore, which can produce sintered ore with stabilized quality by adjusting the blending amount of sous.

In general, in an endless continuous burner (1) Ik'lll, the quality of the sintered ore is determined by the Jatu index (hereinafter referred to as "EC8I").
That's what it means. ), reduction decay index (hereinafter referred to as 1-unit KRDI),
) 1. For example, 8I>89X, le D1<40
I'm keeping XK. However, it is difficult to manage RDI among these, and there is a tendency for DI to increase and reach 1M especially at KJILJ$8.

The cause of this is the so-called season or tsuma! It is said that this is due to the influence of raw material 1, which is not available during the P1 summer season, and raw materials with high moisture content during the summer season, or raw materials that are available during the P1 season and have a high moisture content.

In other words, due to the difference in the composition of raw materials in summer and winter.

Person J, 0. ．． Na, OlK, 0 (negative influence factor on RDI), 8i0. (Favorable influence factors on RDI) 1. It is said that the 0RDI of the finished sintered ore may deteriorate as a result of fluctuations in the sintered ore composition. This rounded product sintered ore 0Fe
Adjust the RDI by increasing the amount of O (magnetite).
When the amount of I-X added is increased, the area is sealed by K. However, with this conventional method, summer OR, DI
II cannot be completely eliminated, and there are many variations.

The disadvantage of RDIIiF was that excessive coke was added, which increased the fuel cost for sintering.

Therefore, the present inventors conducted further research and found that RDIC
) It was discovered that seasonal fluctuations are caused by changes in atmospheric moisture rather than by seasonal effects.

Honji 11&! , 10 was established based on the above knowledge and facts, and specifically, 081 minutes in the air sucked into the sintering raw material layer is continuously determined, and the amount of coke blended is adjusted accordingly. This paper proposes a method of sintering ore that always stabilizes the quality and yields nine sintered ores.

The method of the present invention will be explained in detail below in terms of 1')%/h.

First, it has long been recognized that the RDI of sintered ore tends to become cloudy in the summer.

For example, 5tll(a)tRabiK(14#i2tsuo BDI4D change over time at the sintered edge @ of the steelworks.

The horizontal axis indicates each month of two years.
In both cases, it can be seen that this summer [RDI is blackened (numerical value exceeds #i-%), and the reason for this is as described above.

Therefore, when we calculate the correlation between the two, it is 11! As shown by IEIK, a strong correlation is obtained between DIJ, ``moisture in the suction air of the sea sieve (atmospheric moisture)'' and O.

In other words, when there is a strong correlation between the two (IcF1) and the atmospheric humidity is low, KRDI is ineffective.

□ When the sintered ore reaches 0RDI#/140X or higher, it often clouds the furnace conditions of the blast furnace where it is used, and generally it needs to be controlled at 40X or lower, and considering the variation, it needs to be controlled at 38X or lower. . On the other hand, coke blending ratio (or ij:y-
unit consumption), AJ, 0. , N@,Q,y,,()
, Pea, Tie,, 8i0. , air volume, production rate, etc. have been clarified. Therefore, it is widely used to set up a multiple regression equation by combining some of the factors considered to be important, and to control the RDI in response to changes in each factor. To show.

The following is an underestimation.

First, RDI [fil, te, coke consumption unit (hereinafter referred to as
,.

It is called lower %C0R. ), Sin in x1, p in the product
Multiple regression equation (1) using ea, 40m of weight in finished product as factors
seek.

(RDI) --0,4011 (C,R)-7,! I
I(slO,)-0,1mPe0)-418 (Muro 0.
)+10716 --------(
1) j4D (1) Formula KThh-[, e.g. 8hO,=l
L11%, PeO-59X, 401 ■ 1.8 if O [.

Rounding with RDI≦36N 1040@(C,R)-7,311X&9-0.191
1X & 11-- fL18 X L8+ 167J6≦
sa −”・−(2) holds and 1., C0, l
L≧37.8111/l is obtained.

Sintering can be carried out by adjusting the -3-x in this way.

However, the coefficient between multiple phases in this case is 0.71!09 (contribution rate is 0SZ), which is not necessarily high, and even in actual control, the correspondence is not good at tk%/h, which is assumed as O above; The adjustment amount was too low (IK was too low and too much), and as a result, due to operational instability (RDI variation was also large V%), coke was increased. However, it is difficult to reduce the combustion ratio in a sintering factory. For this reason, we studied the errors between this theory and reality, and found that most of them were due to atmospheric moisture traps.

Therefore, when a multiple regression equation was calculated in relation to the atmospheric humidity N (f/N, l), (3) length was calculated.

(RD I) --0,132 (C,R) -3,2
9 (8 Todoroki 0) - K07 (Fed) - 14,93 (AJ,
0. )+0358N(f/Nd)+94.44...
(3) It was also confirmed that among them, the component #is with the highest partial phase bias coefficient for RDI [is] atmospheric moisture.

Therefore, in the present invention, the estimation accuracy of RDI is improved by blending coke in correlation with atmospheric moisture based on equation 31. That is, in operation, a' RDI ( 36X6 (to achieve this condition because it is necessary to ) is obtained, and the necessary IIc
:I-X distribution can be improved to the minimum necessary, contributing to a reduction in fuel costs at the sintering plant.

To explain in more detail, (3) length.

810, -5. flX, F@0=t9N, person J, 0. −
1.11N.

KRDI≦36% when atmospheric humidity is -13t/Ngd
6[dC,R>34.31, the result is #/l&.

Tsumasho, if you try to reduce the RDI to 36x or less when the atmospheric humidity is the annual average (11.6f/N-) or medium to high, it will be 111KIIi and the coke consumption rate will be 3418#/
1 (Nakako margin 9 ask#/l) It is enough to operate at Aejuku.

Next, @ about the example l! I will clarify.

First, as shown in the gas diagram, even though the atmospheric humidity changes from January to December 2015, operations can be carried out without considering this effect, and this ll0RDI fluctuates by %. 41ec
From July to September, the RDI of OM exceeded 1%, and at this time, the combination ratio was increased to deal with the problem, but the situation seemed to be overextended, and coke reduction was not achieved.

On the other hand, from January to December 1981, the influence of atmospheric humidity was taken into consideration according to the present invention (K.

In response to the rise in atmospheric humidity, such as in the summer, the operation can be carried out by increasing the 1-cox blending ratio, and as a result, the RDI of the finished product can be maintained at the target of 3 with a small amount of coke.
When it was kept below 6X, a sharp edge was created.

In this case, the average coke blending ratio is 55 in the comparative example.
The year is 255X, which is OK, whereas the year 56 of the present invention is z
s
This led to the extinction of coke in 2017.

[Brief explanation of the drawing]

Figure 1111 (14 and -(9) are each year 0RD
Graph %112 showing the change in I'1 is a graph showing the relationship between RDI and atmospheric moisture, and Figure II3 shows the coke blending ratio and RDI in the operation of the method of the present invention and the comparative example. This is a graph showing the relationship between atmospheric humidity, etc. Figure 1 ((2) (b@Figure 2 Atmospheric humidity (97Nu)

Claims (1)

[Claims] The amount of O coke in the sintering raw material is adjusted to correspond to the 011 minutes in the machine side air sucked from the bottom of the pallet, and this sintering raw material is continuously moved on Barret F! A method for sintering ore, characterized by carrying out lIa#II.