KR100469299B1 - sinter manufacture method - Google Patents

Abstract

The present invention is to add starch sugar as an organic binder to the short stray light of the largest galliumite system between the particles during the cutting process of the sintered blended raw material to improve the assemblability of the sintered raw material to improve the air permeability of the sintered layer to improve the sintering productivity The present invention relates to a method for producing sintered ore, wherein the iron ore of the large blue-blue ore system with large particles and pores is set as nucleus particles, and the organic starch, which is an organic binder, is mixed with water at a rate of 4: 6 in the quantitative cutting device of the raw material of the sintered bin, and then sprinkled with water. As a result, the secondary raw material of the next fine powder is accumulated in the cutting belt to increase the cohesive force to improve the size of the granulated particles.The organic binder is transferred to the brownish blue system having large particles and pores that are cut out in the sintering bin during the assembly process of the sintered raw material. By adding Bundang, the particle size of pseudo particle is increased by increasing the binding force between nuclear and fine particles. Not only can the raw unit be greatly reduced, but also the productivity of sintered ore can be improved.

Description

Sintered ore manufacturing method

The present invention relates to a method for improving the assemblability and productivity of a sintered raw material in the production of a sintered ore as a blast furnace charging raw material using a DL (Dwight Lloyd) type sintering machine. The present invention relates to a method for producing a sintered ore by adding starch sugar as an organic binder to a short tail light of the system to improve granulation of the sintered raw material, thereby improving aeration of the sintered layer to improve sintering productivity.

In general, DL (Dwight Lloyd) type fastening process uses 50% or more of branded ore, which is used after evenly mixing a plurality of iron ore and secondary raw materials, and uses 20% of single mineral or so-called single tailings. Use coke, anthracite.

The lead and raw materials are cut out in order by a CFW of a sintering bin as shown in FIG. 1, and then put into a drum mixer 41 to mix and add water to assemble the sintered blended raw materials to form a uniform layer in the sintering unit. It charges to the following height, and fires 52 the sintering compounding raw material, forcibly sucking air 52 from below after surface ignition by the ignition furnace 10, and manufacturing a sintered ore.

The granulation of the sintered blended raw materials is prepared by attaching fine particles of 1 mm or less around the nucleus particles which are the particles of granulated particles using moisture (6.0 to 7.5%) and quicklime (1.0 to 1.8%) to produce pseudo particles. It is a method of increasing the granulated particles of raw materials and reducing fine parts.

As such, when the granularity of the sintered blended raw material is improved, the fine powder portion of the granulated material is reduced, and thus the air permeability of the suction 52 at the lower layer is improved during the production of the sintered ore, thereby improving the sintered ore productivity.

In particular, in order to secure air permeability, there is a method of improving the size by preventing the collapse of the granulated particles and increasing the binding force. As one of the methods, a binder having a binding force such as quicklime is added.

In order to solve the above problems, there is a method of manufacturing a sintered ore using the previously applied starch sugar (application number 1998-35750), but the starch sugar is mixed in the sintered drum mixer 41 and sprayed on the blended raw material to give a very fine (- 0.125mm) It does not adhere to the nucleus particles (1 ~ 2mm) and some of them are combined with each other to reduce the average particle size of the granulated particles, and the cost is increased by mixing the expensive starch sugar with a large amount of water spray (15 ~ 20TH). There is a problem of ascension.

Therefore, the present invention was devised to solve the conventional problems as described above, and the organic binder is applied to the short taillight of the iron ore system which can act as nuclear particles because the particles are large and have large pores during the cutting process of the sintered blended raw material. The purpose is to increase the productivity by adding a certain amount so as to be easily attached to improve the assembly of the sintered ore blend raw materials.

1 is a flow chart of a conventional sintered ore blended raw material quantification method.

2 is a flow chart of the sintered ore blended raw material quantification method of the present invention.

Figure 3 is a schematic diagram of the organic binder is added to the sintered ore blending raw material of the present invention.

Figure 4 is a binder flow chart when spraying the present invention.

<Explanation of symbols for the main parts of the drawings>

10: ignition furnace 26: metering unit

41: drum mixer 52: suction

61: belt dropping portion

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment according to the present invention.

An embodiment of the sintered ore manufacturing method according to the present invention,

After mixing and placing the powdered iron ore and the subsidiary materials, the branding ore used and the powdered coke and the subsidiary materials are mixed, granulated and charged into a sintering machine, followed by firing by suction pressure sucked from the lower layer by ignition of the ignition furnace. In the method of manufacturing the sintered ore,

The iron ore of the brownish blue system having large particles and pores is set as nuclear particles, and when the organic material is extracted in a quantitative extraction device of a sintering bin, the organic binder starch is mixed with water at 4: 6, and then sprayed to remove the next fine powder. It is desirable to increase the size of the granulated particles by increasing the bonding strength by stacking on the belt.

When spraying the binder of the starch sugar and water,

The process of calculating the total compounding quantity (Y) by the pellet speed (P.S) * after layer * width * specific gravity,

Multiplying the calculated blended raw material amount (Y) by the ratio value to be used for the number 6 brown blue light system;

It is preferable that the watering solution is set as much as 10% of the calculated number 6 of the iron ore system, so that organic starch, starch sugar is 40% of the amount of water sprayed, and diluent water is controlled to 60%.

2 is a flow chart of the method for quantitatively cutting the sintered ore blended raw material of the present invention, and FIG. 3 is a schematic diagram of an organic binder added to the sintered ore blended raw material of the present invention, and FIG. As follows.

During the assembly process, the brownish iron ore, which can act as a nuclear particle, is incorporated into bin 6 of the sintering bins 1 to 15. The reason for this is that after the branding ore is excised from bins 1 to 5, Before the fine powder is excavated, the fertilized ore, which can act as a nuclear particle, is excised and then a predetermined amount of the organic caking agent and water is mixed. After the water is sprayed on, a number of fine limes, silica sand, limestone and serpentine are excised to be loaded on the transport belt to the top of the short tailings of the iron ore system with organic binders, and the semi-heat and powdered coke are heat-extracted drum mixers. The mixture is granulated and granulated by adding a certain amount of moisture.

The amount of the organic binder added to the nuclear particles is mixed with water 4 and 6, and the amount of water is sprayed so that 10% of the water is used in the single use ratio that will serve as the nuclear particles.

As mentioned above, the reason why the water and organic binder is 4: 6 is that when the organic binder is 4% or less than the water, the effect of the binder is decreased. The ratio of water and caking agent was set to 4: 6 by inducing the variation of granulated particles because it was not sprayed, and the amount of caking agent was used when using a lot of short tailings of the brownish pore-type ironite system as shown in FIG. The ratio was set at 10%, because less than 10% of the effect is less than 10%, and a binder flows through the belt.

TABLE 1

As shown in Table 1, the yandi light of the iron ore system has an average particle diameter, porosity, and water absorption ability, so that the organic binder is sprinkled when cutting out from the sintering bin used as nuclear particles. Limestone, silica and branding ore are attached to the nucleus particles with an organic binder as a bonding bond to increase the assembly order of the blended raw materials to improve productivity.

Examples

Starch sugar is used as an organic binder in the assembling process of sintered blended raw materials. The starch sugar is prepared by adding saccharifying enzyme and water to corn starch, followed by saccharification, purification and concentration.

TABLE 2

The chemical composition and properties of the starch sugar are shown in Table 2, mainly composed of C, H, O elements, ash and alkali (Na, K) content is very low, the combustion temperature is 235 ~ 540 ℃.

The main constituents of the starch sugar are 48.7% of saccharoid, 27.8% of dextrin, a hydrolysis product of starch, and 23.5% of moisture.

TABLE 3

The blending conditions of the sintered raw materials are shown in Table 3, and the branded iron ores are the average particle diameters of four types of hematite spectroscopy analyzed from the raw material yard uniformly mixed with the subsidiary materials. Alternately use (roberiver).

The secondary raw materials are usually limestone, serpentine and silica sand used in sintering, and sintering practical operation is performed using powdered coke and semi-glossy as heat sources.

When the short tailing light, which is a limonite system, is cut by the raw material quantitative extraction (CFW) device, a solution containing an organic binder and water in a 4: 6 ratio is sprinkled with a solution corresponding to 4.0%, which is twice the ratio of the use of the iron ore. When the branded ore to be cut is attached to the short tailings of the iron ore system, which is a nucleus particle with organic binder, the size of the granulated particles is increased by the adhesive force of the organic binder, and the fine silica sand lime is accumulated on the cutting belt. Increased cohesion between the subsidiary materials improves the granulated particles, and by mixing and spraying in a drum mixer, a blended raw material having a form of complete granulation is obtained.

TABLE 4

Table 4 shows the results of the granulated particles before and after the addition of the organic binder in the mixing condition of the blending raw materials according to Table 3 at the rear end of the drum mixer.

After cutting the sintered ore blend raw material and adding the organic binder, the average particle size of the granulated particles was measured, and when the binder was not added, the average particle size was 1.70mm and 2.01mm when the starch, which is the organic binder, was added. Increases in size

TABLE 5

The change of the sinter productivity operating index at the time of manufacturing a sintered ore from the compounding raw material obtained by the operation result by the said method is shown in Table 5 above.

In addition, as a result of performing the sintering operation using the obtained sintered ore blending raw material, the productivity is increased 1.0t / dm ³ as shown in Table 5 above, the back pressure of the air permeability index is reduced by 130 mmAq, and the air volume increases to 600 Nm ³ / min. The addition effect of the organic binder can be confirmed.

In addition, as shown in FIG. 4, when the total compounding amount (Y) is calculated based on pellet speed (PS) * layer thickness * width * specific gravity, multiply the ratio values of the six brown blue light systems by using the ratio of the nuclear particles. The amount of water used is calculated, and the spraying solution is set as much as 10% of the calculated amount of lmonite system, so that the organic binder starch is controlled at 40% of the amount of water sprayed and 60% of the diluent water is controlled (s10∼s50). .

As described above, according to the present invention, by adding starch sugar as an organic binder to the particles of raw materials cut into the sintering bin during the granulation process of the sintered raw material and the large blue-blue light system, the binding force between the nuclear particles and the fine particles is increased. As the particle size of the furnace is charged to the sintering machine, the raw unit can be greatly reduced by increasing the combustibility by improving the air permeability, and the productivity of the sintered ore can be improved.

Claims (2)

After mixing and placing the powdered iron ore and the subsidiary materials, the branding ore used and the powdered coke and the subsidiary materials are mixed, granulated and charged into a sintering machine, followed by firing by suction pressure sucked from the lower layer by ignition of the ignition furnace. In the method of manufacturing the sintered ore, The iron ore of the brownish blue system having large particles and pores is set as nuclear particles, and when the organic material is extracted in a quantitative extraction device of a sintering bin, the organic binder starch is mixed with water at 4: 6, and then sprayed to remove the next fine powder. Sintered ore manufacturing method characterized in that to accumulate on the belt to increase the bonding strength to improve the size of the granulated particles. The method of claim 1, wherein when the binder of the starch sugar and water The process of calculating the total compounding quantity (Y) by the pellet speed (P.S) * after layer * width * specific gravity, Multiplying the calculated blended raw material amount (Y) by the ratio value to be used for the number 6 brown blue light system; The sintered ore is characterized in that the spraying solution is set as much as 10% of the number 6 of the calculated iron ore system, so that the organic starch, the starch is 40% of the amount of water sprayed, the water diluent is controlled to 60% Manufacturing method.