JPS6082623A - Blending process for raw material for sintering - Google Patents

Abstract

PURPOSE:To stabilize components of sintered ore by determining contents of components of raw materials for sintering by calculating the density of each kind of sintering raw materials and adjusting blending ratio so as to obtain target value of components of the whole sintered raw materials obtd. from the previously determined contents of components. CONSTITUTION:Each raw material is fed by each belt feeder 3 from stroage tanks 1A-1M contg. each raw material by driving a motor 7, and the height in the belt feeder 4 is adjusted by an adjusting device 5. Data on the angle of the adjusting device 5, the amt. of feed on a weighing machine 6, and the number of revolution of the motor 7, 8, are fed to each feed controller 9, and inputted to a main arithmetic device 10. The main arithmetic device 10 renews and stores the present blending proportion and present density basing on these inputted information, operates the quantities to be fed from each raw material tank 1A- 1M basing on each information inputted from an external inputting device as necessary, and controls the number of revolution of the motor 7, 8 so as to obtain target values for each feed amt.

Description

DETAILED DESCRIPTION OF THE INVENTION OJh Akira's Technical Field] Kimitsu 1 relates to a method of blending sintering raw materials for stabilizing the components of sintered ore.

[Technical background of the invention and its problems]

The component stability of sintered ore is determined by the quality of sintered ore (T, 1.R, IC
It is well known that it is essential for the stability of Conventionally,
As such a component stabilization method, feedback control is performed based on component analysis values of sintered ore. However, this will delay the action to stabilize the ingredients, and since the action is based on the assumption that the ingredients of the blended raw materials of the analysis sample and the current blended raw materials are the same, each ore that occurs due to the following reasons It is not possible to understand changes in the composition of the blended raw materials due to changes in particle size, and the actions are inevitably inaccurate.

Incidentally, the sintering raw material is a mixture of powdered iron ore of various brands as a main component, auxiliary materials such as N1 slag, crushed sand, dolomite, limestone, and coke powder as a fuel.

The formulation for each brand of this sintering raw material is that each brand is cut out from the stored raw material tank and mixed with a drum mixer. Even if it is cut out, it often does not necessarily result in a sintered raw material with a constant composition, depending on the segregation within the raw material tank of each brand.

In other words, the raw materials stored in the raw material tank J11 for each brand are supplied to the center of the raw material tank, so it forms a mountain shape, and the fine particles are stored mainly, and the raw materials are stored on the side wall of the raw material tank. is stored around phase R because the charged raw material rolls from the center toward the sidewalls. Therefore, in the raw material cutting process from the raw material tank, many fine grains are cut out in the early stage, and many coarse grains are cut out in the latter stage.

Under circumstances where such changes in particle size occur, even if the blending ratio is determined according to the ingredients of each brand of raw material so that the amount of ingredients in all sintered raw materials is the specified amount, it will not be possible to reach the desired amount of ingredients. It is impossible to adjust.

[Purpose of the invention]

The present invention solves the above-mentioned conventional problems, can quickly cope with fluctuations in the component content of sintered raw materials, and can accurately control the component content, thereby greatly contributing to stabilizing the quality of sintered ore. The object of the present invention is to provide a method for blending raw materials for sintering.

[Basic knowledge of invention]

In view of the above-mentioned problems, the present inventor conducted various tests with the idea that it would be possible to determine the composition of sintering raw materials from a direction different from the conventional one, and obtained the following knowledge6.
The change in particle size of each brand of Kotonohara #1 cut out from the raw material tank can be seen as a change in the density of the raw material.

■ Changes in the particle size of each brand of raw material cut out from the raw material tank can be seen as changes in the amount of ingredients in that raw material.

(Satoru: Therefore, there is a certain correlation between the density of the raw material cut out from the raw material tank and the amount of its components.

■ Therefore, by determining the relationship between the density and the amount of ingredients for each brand of raw material in advance, it is possible to easily predict the amount of ingredients at that time by actually measuring the density of that brand of raw material.

Φn By summarizing the component amounts predicted for each brand of raw material as a whole sintering raw material based on their mixing ratio, it is possible to estimate the component amount for the entire sintering raw material.

[Structure of the invention]

Based on this knowledge, the present invention to achieve the above-mentioned object is based on the calculation of the weight of υJ output per unit time and the volume of υJ output per unit time for each brand of sintering raw material from each raw material tank in which it is stored. Calculate the density at each moment, and calculate the above q for each brand from the pre-known relationship between the density and component content for each brand.
Determine the component content corresponding to the obtained density, and then calculate the component of the entire sintering raw material from the component content for each brand and the blending ratio of each brand blended as a sintering raw material.
This method is characterized by adjusting the blending ratio of each brand so that the component content of the entire sintered raw material, including j, i, and the like, becomes a target value.

[Specific examples of the invention]

The wood invention will be specifically explained below.

FIG. 1 is a schematic diagram of an example of cutting equipment for sintering raw materials, in which, for example, 13 raw material tanks IA to IM are arranged for each brand of sintering raw materials, and each belt feeder 3 is driven by a motor 7.
Each raw material is cut out by

The degree of compression of the discharged raw material differs depending on the weight of the raw material stored in the Jg raw material tank and the height of the cutting gate 2, so in order to release the compression applied to the raw material between the belt feeders 3 and 4. It is sent to the belt feeder 4 again.

In the belt feeder 4 driven by a motor 8, the fed raw material is adjusted to a height corresponding to the amount of raw material by a height adjusting device 5 having a constant weight. The angle of the height adjustment device, the cutting weight of the weighing machine 6, and the rotation speed of the motor 7°8 are sent to the cutting controller 9, where the angle of the height adjustment device is adjusted to the raw material height and the rotation speed of the motor 7. is converted to the cutting belt speed, and the cutting type H- is converted to the value obtained by subtracting the weight of the height iA adjusting device added to the raw material from the cutting weight of the weighing machine 6.

The cutting controller 9 corresponding to each raw material tank is connected to the upper main processing unit IO. Reference numeral 11 denotes an external input device such as a CR7 display device.

Under such cutting equipment, the following method of blending sintering raw materials is adopted. (Refer to the calculation processing flow in Fig. 3.) In other words, first, the main processing unit 10 calculates the cutting weight (
T/min), cutting pelt speed 1'' (m/min), raw material height m) is manually performed.Meanwhile, the raw material on the Healto Feeder 4 corresponding to each raw material tank input by the external input device is input @(m). Based on the above input values, the blending ratio (X) of each brand is calculated based on equation (1), the density of each brand is calculated based on equation (2), and the current blending ratio and current density are updated and stored.

Mixing ratio of i brand (2) = ... C1) Secret 1 of i brand! ! J (T/rn') - Cutting amount of stock i ÷ (cutting held speed width of stock i)... (2) (S) If the density of the previous action poem of each stock is all zero (external When there is a recipe change instruction from the input device),
Write the current density of each stock in the tone of the previous action (move to the end).

('3; For conditions other than e) above, use equation (3) to determine the J component (e.g. sro2, At2o3) in the pure raw material.
etc.) to calculate the amount of change.

Changes in J component in pure raw materials. ftL ($) = 'E'' [Current mix of i brand $/100 X (Current density of i brand - Density at the time of last acquisition of stock brand) x (Ratio of J component change amount to change in density of i brand ¥) ]...(3) In the example of Newman η, Ij, the rate of change in J component is
The relationship shown in FIG. 2 can be known in advance. By knowing this relationship in advance for each brand, it is possible to know the amount of change in the J component with respect to the amount of change in density of all brands.

I small Next, J in the pure raw material calculated based on formula (3)
The amount of component change is a preset value, for example S + 0
2 ±0.10, A1203 ±0.02
Determine whether the amount of change in each component is exceeded, and if there is a component that exceeds the above, use a preset RJF performance brand to change the blending ratio to minimize the amount of change in each component, for example. Calculate using the L/P note, use this as the current blending ratio, and write the current density of each brand into the density at the time of the previous action. Here, as the nf performance grade for changing the blending ratio, for example, in the case of S102, there are Ni slag, crushed sand, etc., and in the case of A12o3, there are low AI203 rust, stone, etc.

(5) Current blending ratio of each brand and necessary setting from external input device: (I! br! Raw energy: 1 feed f.la? (T
/H) (Wet) using t,1 Te(4) and Equation (5). (Then, the cutout amount (T/H) of each raw material tank) (We t
Base) is calculated as 111, and this value is given to the corresponding cutting controller as the cutting amount target value of each raw material tank.The rotation speed of motors 7 and 8 is control.

Pure raw material supply target (T/H) = XWet pure raw material candy raw material target (T/H) ÷too −
- (4) Cutting amount of each raw material tank (T/i+) (We
t) = (Φ If there is a recipe change instruction from an external input device (change the brand used in each raw material tank or change the blending ratio),
Write the manually calculated blending ratio of each brand into the current blending ratio, set the current density of each brand and the density at the time of the previous action to zero, and move on to ■.

According to the above blending method, as shown in 7 in Table 1,
Compared to the conventional method, it was revealed that the number of times the action for stabilizing the ingredients was performed was increased, and the variation in product ingredients and quality was reduced.

Table 1 [Effects of the Invention] As described above, according to the present invention, it is possible to quickly deal with fluctuations in the component content of the sintering raw material, and moreover, it is possible to accurately control the component content, thereby stabilizing the quality of the sintering raw material. can be achieved with certainty.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of cutting equipment for carrying out the method of the present invention, FIG. 2 is a density-component relationship diagram in the case of Newman ore, and FIG. 3 is a calculation processing flow sheet. IA, IM... 31 tanks of raw energy 2... Cutting gate 3.
4. Peru feeder 5. Height adjustment device 6.. Weighing machine 7, 8.. Motor 9.. Cutting controller 1O..
Main processing unit +1...External human power device Patent applicant Yoshihisa Nagai, patent attorney for Sumitomo Metal Industry Co., Ltd.

Claims (1)

[Claims] (1) For each brand of sintering raw material, each stored 1
! i! : $14 (C1i cutting type per hour from 'l+, +41 and cutting volume, i(+1' of each ') is calculated, and the density and component content of each brand are known in advance. From the relationship, ゛, calculate the component content corresponding to the density calculated above for each brand, and then calculate the entire sintering raw material from the component content of each famous brand and the blending ratio of each brand to be mixed as the sintering raw material. A method for blending sintered raw materials, characterized in that the blending ratio of each brand is adjusted so that the component content of the entire sintered raw material becomes a target value.