JPS62235430A - Manufacture of sintered ore blended with tio2 ore - Google Patents

Abstract

PURPOSE:To manufacture sintered ore having superior strength in a high yield without reducing productivity by mixing fine TiO2 ore with fine iron ore, compacting and briquetting the mixture, adding the resulting briquettes to starting materials for sintering and sintering them. CONSTITUTION:A high TiO2 source such as ilmenite or iron sand is mixed with fine iron ore such as iron manufacturing dust or pellet feed. After a binder is added, the mixture is compacted and briquetted. The resulting briquettes are added to starting materials for sintering and sintered. By this method, sintered ore can be manufactured under satisfactory conditions even when the TiO2 source is blended by a large amount.

Description

[Detailed Description of the Invention] The present invention incorporates 7'jO2 ore into the manufacturing method of sintered ore mixed with 7'jOz ore, thereby reducing the production rate and improving the strength. The purpose of the present invention is to provide a method that can produce a desirable sintered ore.

Industrial applications Manufacture of sintered ore mixed with 几02 ore.

Conventional technology The sintering method has been known for a long time as a method for agglomerating all powdered ore, and can be said to be the mainstream agglomeration technology. On the other hand, in order to protect the large materials at the bottom of the blast furnace, Tj in the charging material must be
A method is adopted in which a layer of pig iron with a high Tt# is formed on the bottom of the furnace, but in such a S layer, iron sand illuminite and other powdery NO□ sources are used as sintered ore. It is preferable to add

Therefore, it seems that some studies have been made to obtain sintered ore from such a high TtO2 source.

The problem that the invention aims to solve However, iron sand, illuminite, etc., which are high not sources, are 0.
．． Although it is mainly composed of fine powder such as 21 or less, it is easy to powder, especially in highly concentrated sintered ore, and it is difficult to obtain appropriate strength.

For this reason, it seems that efforts have been made to reduce the content of the N02 source, add CaO sources (limestone, dolomite), or perform firing at a particularly high temperature, but no favorable results have yet been obtained. Of course it has not reached high'rtO
It is possible to use double lump ore, but it would be expensive.

In addition, as mentioned above, when a high NO□ source that is easily powdered is charged into the blast furnace, TjO2 is likely to be mixed into the blast furnace dust.

"Structure of the Invention" Means for Solving the Problems A mixture of finely powdered 7'402 ore and finely divided iron ore is made into a fully consolidated priquet, and then mixed into a sintering raw material,
A method for producing sintered ore containing TiO ore, characterized by subjecting it to sintering treatment.

By briquetting, the finely powdered Tc0t ore is sandwiched between other ore powder particles, and the other ore powder particles are closely abutted to each other to form a prequent. The permeability of the raw material layer is the same as above, increasing the combustion rate of the blended coke, shortening the sintering time, and increasing productivity.

The use of compaction priquets as described above results in increased yield and improved sintered ore quality.

In addition, the effect of priquetting according to the present invention is as follows: fine powder 7'40
The effect is not limited to two ores, but is effective on any ore as long as it is a so-called fine powder of 1.0 to 0.5 or less.

Implementation To further explain the present invention as described above, the present inventors have conducted detailed studies on obtaining sintered ore with a high concentration of 02, as described above, and have found that the above-mentioned ilvanite and iron sand The production rate can be particularly improved by allocating dust generated in the steelworks such as dust dust and BFOG dust or fine iron ore such as pellet feed to a high-concentration O7 source such as gas dust and BFOG dust, and by using this as a priquette by compacting all rolls. We succeeded in obtaining the desired sintered ore under conditions where the sintering time was kept relatively low even under high blending conditions, and the yield of residual and finished products was high.

That is, the present inventors have specifically adopted 7t 7'j O, the ore is iron sand and irvanite, and mixed dust and BFOG dust or pellet feed is added to this, and a binder is added to it. Pricketization is performed using the equipment shown in Figure 1. That is, the raw material 1 is sent to the pumper 3 by the conveyor 2, and the raw material 1 is fed to the stirring tank 5 by the conveyor 4. A supply pipe 83 from a binder tank 8 is connected to the stirring tank 5, and a measuring means 81 and a pulp 82 are connected to this, and a scraping piece 7 and a pressure gauge 9f are also attached. 55i is provided, and a water supply pipe 58 is connected to this. Stir even more! A stirring blade 53 and a scraping piece 54 are provided in the motor 6.
1 and a rotation shaft 6 driven by a speed reduction mechanism 62. A ricketting chamber 10 is formed in the pressure outlet 59 provided on one side of the stirring tank 5.In the chamber 10, a roll 12 is provided on a disk 13 for powder compaction, that is, the structure of this part is as follows: The details are as shown in Fig. 2.3, in which a plurality of Russells 18 and rolls 12 are radially provided on a vertical shaft 11 which is rotated by a motor 17 on a disk 13'. is the disk 1 by the hydraulic mechanism 19.
As shown in FIG. The pieces are sequentially formed into the forming hole 2o to the full size, and the pieces extending to the bottom surface of the disk 13 are cut with a knife cutter 14, and then carried out from the chute 15 onto the carry-out belt 16.

Said Yusato Iron, Ilbanite, Mixed Dust, BFO
An example of particle size distribution for G dust and pellet feed is shown in Table 1 below.

For example, from the raw materials shown in Table 1, a fine powder mixture consisting of 50% iron sand and 50% islet feed was used,
This is replaced with bending material (an iron ore powder mixture commonly used as a sintering raw material) (50% in 10% increments).
The following describes the results of the sintered steel test in the case of 300" and 400".

When blending the fine powder mixed raw materials, some are made into rickets using the equipment shown in Figures 1 to 3 above, while others are blended as fine powder. The basicity of each mixed raw material of n is 1.95.5i02 is 5.40%, and the coke ratio F1 is kept constant at 13.0%. , sintering time,
The yield and strength of the finished product were tested and measured, and the results are shown in Figures 4 to 7.

In other words, increasing the proportion of TiO2 ore causes deterioration in sinterability, but by making it into priquets and blending it, the negative effect can be appropriately reduced, and in terms of production rate, TLO□ ore can be mixed at 50%. Even when it is made into briquettes, it is at the same or higher level than when it is not mixed at all, and the sintering time is about 26 minutes or less when 20 to 50% of TLO2 ore is mixed, which is better than when it is not mixed at all. It is at a level that is not much different from those that do not. Furthermore, the product yield is rin, which is blended as a fine powder.
o 1 It will get worse due to the increase in ore dividends, but there is a tendency for priquettes and friends to be slightly the same as above. Also T, I (+10m
%) overall, it deteriorated due to the increase in ore distribution, but it was confirmed that the degree of deterioration in the priquetted type was considerably lower. Incidentally, in the above-described embodiment, alcohol waste liquid is used as the binder, but of course, quicklime, pulp waste liquid, etc. may also be used. Mayu, Prickett's 5i02%, A410%, base 2 (=cao%
/&0□%), etc., depending on the sintering conditions.
If necessary, charcoal material may be placed inside. Furthermore, the raw material to be added to the nOg source may be any of various types of dust, such as fine ore for sintering.

``Effects of the Invention'' According to the present invention as explained above, even under such conditions that the concentration of the 02 source is as high as at least 20 to 30%, the production rate, sintering time, product yield, and strength can be improved. It is possible to produce sintered ore under favorable conditions with almost no deterioration in any of the above, and this invention has great industrial effects.

[Brief explanation of drawings]

The drawings show the technical contents of the present invention, and FIG. 1 is an explanatory diagram showing an example of the ricketting equipment according to the present invention, and FIG. 2 is a perspective view of the disk and roller portions thereof.
Fig. 3 is a cross-sectional view showing the compaction forming operation, and Figs.
This is an indicative chart summarizing the relationship between product yield strength and the amount of 7'j Oz in sintered ore with and without pricketing. In these drawings, 3 is a pumper, 4 is a conveyor, 5 is a stirring tank, 6 is a rotating shaft, 1 is a scraping piece, 8 is a binder tank, 10 is a ricketting chamber, 12 is a roll,
13 is a disk, and 14 is a knife cutter. Patent Applicant: Nippon Kokan Co., Ltd. Inventor: Yoji Yamaoka, Takemoto, Kenjikudai, 2nd Picture, J Picture, 4th En, 5″ Circle Symbol 0 Leopard 1 → (s) 1st Country Entry

Claims (1)

[Claims] A method for producing TiO_2 ore-containing sintered ore, which comprises mixing finely powdered TiO_2 ore with finely divided iron ore, compacting it into priquets, blending it into a sintering raw material, and sintering it.