JPS5831038A - Water controlling method of sintered material - Google Patents

Abstract

PURPOSE:To control water contained in a sintered material to a proper value, by continuously measuring the water in a mixed material of a sintered ore, comparing it with water contents set in advance, and adjusting the quantity of feed water of a water spraying device by its deviation value. CONSTITUTION:Such sintered materials as iron ore powder, coke powder, a return ore, etc. from plural hoppers 1 are weighed by a weighing machine 2, are dropped on a belt conveyor 3, are mixed by a mixer 4, simultaneously water is added by a water spraying device 6, and they are converted to pseudo grains. They are dropped on a pallet of a sintering device through a hopper 8 and are sintered. In this case, water of the sintered materials coming out of the mixer 4 is continuously measured by an infrared water content meter 9, is compared with the most desirable water value set in advance, by a computer 10, a flow rate controlling meter 7 of water of the water spraying device 6 is controlled by its deviation value, and the flow rate is adjusted so that the contents of water contained in the mixed materials become a proper value.

Description

[Detailed description of the invention] The present invention relates to a method for controlling moisture in sintered raw materials.

The waWi raw materials are raw materials such as various brands of iron ore, coke added as solid fuel, ore produced as a by-product in the sintering process, and mixed with water and pre-processed to form pseudo-granules. It is something.

In particular, when processing raw materials, water added with inkener etc. has the effect of turning the raw material consisting of powder particles into pseudo-granules and imparting air permeability, so it is indispensable in the processing of sintered raw materials. It is desirable to manage the moisture content to an optimal value, which is determined from the following factors.

However, in the past, the moisture adjustment device, which is the most important part of this moisture control system, had insufficient accuracy and did not necessarily maintain the optimum moisture value.

A neutron moisture needle is known as a device that continuously adjusts and monitors the moisture content of V8M raw materials, and a method for specifying the moisture content of IIA raw materials at the feeder arm of a sintering machine has been widely put into practical use. However, when determining the moisture content of 118M raw material at the ore feeder, the measurement accuracy is poor due to the R'tl of the raw material, wear of the neutron moisture needle storage, changes in the bulk density of the raw material, etc., and it does not meet the operational needs. good.

Non-inventiveness is inevitable in this situation.

That is, in the pre-treatment process 11 of sintering raw materials, an infrared moisture needle is installed on the conveyor after the mixing device that mixes various raw materials, and the moisture content of the mixed firefly raw material is measured using this infrared moisture at. The purpose is to control the final moisture value of the spring sintered raw material based on the measured moisture value.

Practical examples of the present invention will be explained in detail below based on the drawings.

FIG. 1 is a conceptual diagram for explaining the invention in detail.

As shown in Fig. 1, the invention is based on a weighing device 2.2, which stores raw materials such as various brands of iron ore, coke powder, and return minerals separately. ．．
Conveyance such as belt conveyor 3 via ......
Cut out a predetermined amount of various raw materials and fuel onto the tt, and do it? - At the same time as mixing in step 4, water is added to water sprinkler 6 to adjust the water content.

In the sintering needle pretreatment device, the pseudo-grained 9 sintered raw material is charged into the feed hole #-8 via the conveyor 5, and is continuously supplied from there onto the A-let 11.
An infrared moisture meter 9 is used to continuously measure the moisture content of the sintering raw material. The final moisture content M of sintering is controlled to a predetermined value by adjusting the amount of water supplied by the infrared moisture meter 9.
Moisture measurement of the Ia raw material is performed by changing the calibration curve according to the blending ratio of various raw materials and the change in mVc of the particle size structure to measure an accurate moisture value.

According to the experiments of the non-inventors, the infrared moisture meter is.

As shown in Figure 2, different brands of raw materials show different fixed values even with the same moisture content.

Also, even if the same raw material pipe is used, as shown in Figure 3, if the particle size distribution is different, the same water content will show different constant values, etc.Il'ii! Changes in the properties of raw materials have a very large effect! -0 Alternatively, in the case of a bound object that absorbs almost no moisture, such as iron ore, the measurement of moisture using infrared rays measures the amount of water adhering to the surface of the original lP4. It is important that the amount represents the total moisture content, therefore, the measured value has a meaning of 0 to 1-6. In order to realize the measurement, a calibration curve (compounding ratio of raw materials of 1 grain size) was set on a computer, and the moisture value was calculated from the calibration curve IsK. Since the moisture content of the sintering raw material is measured, it is also possible to eliminate the time delay in control when correcting the moisture content of the sintering raw material.

Specifically, as shown in FIG. 2, each of the various raw materials has its own unique calibration curve, and can be broadly classified into blackish brown, reddish brown, rice nol 1 lime, coke, etc.

According to experiments conducted exclusively by the present inventor, changes in the infrared moisture value due to the blending ratio of various raw materials and particle size can be corrected as follows.

Y=(1+2.5A-141#+1.34D)X-(o
, s B −s s o + 0.76 B) Y: infrared correction value, x: infrared #measured value.

Human: Black-brown ore composition change rate.

B: Reddish-brown ore composition change rate.

0: Rice ale blending change rate.

D: Rate of change in lime mixture.

ll: average s degree, for example, base*wI4 normal blending ratio is black brown ore 12
1G, #I brown ore! Mi1. ? (x/-ru0*.

Lime 12-1 Others (return ore etc.) 20%, average grain [2,
67■, but due to subsequent formulation changes, the
t'shi 1 (1,5411,211,121,1111chi, 2.78 gardens, six and I!, moisture value by drying method is 6
．． The original 14 of 1- is converted into infrared 4Ill without correction [l constant value is 5
．． (1L correction is made for 87 rice cakes and the result is 6.11%), making it possible to correct the actual moisture content.

First, as shown in Figure 4, variations in the distance 1li (#J constant distance II) between the infrared moisture needle detection point and the raw material surface also change the measured value, so the forming roller 12 shown in Figure 5 is It is installed on the belt conveyor 13 1m after the ink tanker, and by making the height fluctuation of the raw material surface constant and the internal shape constant, the infrared reflectance is stabilized, and a high ellipse [a constant] is made possible. It can be done.

By using an infrared moisture meter in this way, stable and highly accurate moisture measurement can be achieved close to the water addition equipment, making it possible to control the final raw material moisture at a constant level without any time delay.#! As shown in Figure 6.

Compared to conventional neutron-based control, the final feed water content can be significantly stabilized.

As described above, the uninvented method has great effects in that it can improve the moisture content of the sintered compound raw materials, improve sinter production efficiency, improve quality, and reduce costs.

[Brief explanation of drawings]

Figure jlE1 is a conceptual diagram showing one embodiment of the present invention. Figure 2 is a diagram showing the changes when individual raw materials of various brands are measured with an infrared moisture needle. Figure 3 is a diagram showing the influence of the raw material particle size on the measured value, Figure 4 is a diagram showing the influence of variation in the distance from the detector to the raw material surface on the fixed value, and Figure 5 is a diagram showing the influence of the raw material surface level on the constant value. Fig. 6 is a diagram showing the transition of the raw material moisture of the race shell by changing from the conventional neutron type moisture control to the nine moisture control using the infrared type of the present invention. be. 1: Hopper, 2: Weighing device 3.5: Belt conveyor, 4: Water tank, 6: Watering device, 7: Flow rate controller, 8
:Ore supply hotsuno'-19: Infrared moisture meter, lO: Calculator,
11: "Let, 12: Kaidan Low 2-, +3: Belt Conveyor, 14: Infrared Moisture Needle. Agent Patent Attorney Masamitsu Akizawa et al. 2 Meikenkai Shy〉-Rikudo (11C 4) Ben 30 Large Figure 4

Claims (1)

[Claims] (1) 1lli! In the raw material pre-treatment process, an infrared moisture needle is installed on the conveyor after the equipment that warms various raw materials, and this infrared moisture needle changes the calibration curve according to changes in the properties of the raw materials in the warming bales. A method for controlling the moisture content of a sintered raw material, characterized in that the moisture content of the raw material at the mixing edge is measured, and the final moisture value of the vala raw material 0jIk is controlled based on a fixed value on the moisture side of the kernel.