KR20080074524A - Ore sintering composition and ore sintering method - Google Patents

Abstract

An ore sintering composition and an ore sintering method are provided to increase the productivity, to improve a combustion efficiency, to save energy, and to reduce an emission of air pollutants. An ore sintering composition includes an ore fine powder, a solvent, a coke powder, and a productivity improver containing a viscous concentrated sweetener. Further, the productivity improver additionally comprises organic enzyme, and the ore sintering composition additionally comprises water. An ore sintering method includes the steps of: preparing a raw material containing an ore fine powder, a solvent, and a coke powder; forming quasi particles by bonding sticky fine powder of the raw material to coarse nuclei of the raw material through the water and viscous concentrated sweetener to form a sintering mixture; and burning the coke powder to integrate the sintering mixture into a sintered cake.

Description

Ore sintering composition and ore sintering method {ORE SINTERING COMPOSITION AND ORE SINTERING METHOD}

1 is a flow chart illustrating the successive steps of a preferred embodiment of the ore sintering method according to the invention;

2 is a schematic diagram of a sintering system for carrying out the ore sintering method according to the present invention.

The present invention relates to an ore sintering composition and an ore sintering method, and more particularly, to an ore sintering composition comprising a viscous concentrated sweetener and an organic enzyme, and an ore sintering method using the ore sintering composition.

Conventional sintering processes involve mixing ore (eg iron ore), solvents, and coke powder with water in a mixing drum to produce a homogeneous mixture, placing the mixture on a sintering machine, and igniting the mixture with ignition. Igniting coke powder of the mixture through to form a combustion zone, and melting the combined fines of the mixture to incorporate the mixture into the sinter cake. The sintered cake is collapsed and screened to obtain an appropriate size (> 5 mm) for subsequent use. Disintegrated pellets having a size of 5 mm or less, called self fine, will be resupplied in the sintering process.

In the sintering process, the productivity is defined as the ore, that is, ton / m ² / 24hrs per unit area of the sintered for 24 hours production.

It is an object of the present invention to provide an ore sintering composition and an ore sintering method using such ore sintering composition to increase sintering productivity without increasing costs and complexity of existing equipment or equipment.

According to one aspect of the present invention, the ore sintering composition comprises a productivity enhancer comprising particulate ore, a solvent, a coke powder, and a viscous concentrated sweetener.

According to another aspect of the present invention, the ore sintering method comprises the steps of preparing a raw material containing particulate ore, a solvent, coke powder, the adhesive fine powder of the raw material on the coarse nuclei of the raw material using water and a productivity enhancer Combining to form a sintered mixture to form similar particles; And burning the coke powder to incorporate the sinter mixture into a sinter cake.

The features and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.

Preferred embodiments of the sintering composition according to the present invention include particulate ores, solvents, coke powder, water, and productivity enhancing agents comprising a viscous concentrated sweetener and an organic enzyme.

Since the mixture of particulate ores, solvents, and coke powder contains a significant amount of particulates, the conventional method of adding water only for granulation is that when inhaled flowing air passes through this kind of granules on a sinterer, It results in poor combustion efficiency, and satisfactory porosity and permeability cannot be achieved. To solve this problem, viscous concentrated sweeteners are applied thereto. Specifically, the adhesive fines (ie particulates) of the mixture are bonded to the nucleus of the mixture of particulate ore, solvent, and coke powder using a viscous concentrated sweetener to produce better analogous particles with reduced bulk density on the sintering machine. To form. Better pseudoparticles provide more granular porosity and larger gas flow channels, allowing more combustion air to flow there, thereby improving combustion efficiency, shortening combustion time, and increasing sinter production rates. Can be.

Preferably, the viscous concentrated sweetener is selected from the group consisting of molasses, sugar cane syrup, beet syrup, honey, maple sugar, fructose, fructose sugar and mixtures thereof.

Organic enzymes act as sacrificial catalysts to lower activation energy, increase the rate of combustion, and decompose the high molecular weight hydrocarbons of the coke powder into smaller pieces, making combustion of the coke powder more efficient and complete. Organic enzymes are prepared from bacteria selected from the group consisting of lactic acid bacteria, yeasts, actinomycetes and mixtures thereof. Productivity enhancers further include chaff, soybean powder, camellia powder, takju, corn powder, potato powder, rice vinegar, trace minerals, or mixtures thereof, which serve as substrates of bacteria. Preferably the trace minerals are selected from iron, aluminum, magnesium, silicon, and mixtures thereof.

Preferably the water content of the ore sintering composition is in the range of 6-9% by weight, and the content of the productivity enhancer in the ore sintering composition is in the range of 1 to 3% by weight.

In the present invention, the ore may be iron, copper, zinc, manganese, bauxite, magnesite and the like. Solvents vary depending on the ore used. In general, it may be limestone, dolomite, serpentine, silica sand and the like.

1 illustrates the successive steps of a preferred embodiment of the ore sintering method for the preparation of ore sintering compositions according to the present invention. 2 shows a sintering system for carrying out the ore sintering method according to the invention. In this embodiment, iron ore is used as an example for explanation.

As shown in FIG. 1, the ore sintering method includes preparing a mixture of raw materials including particulate ore, a solvent, and coke powder, and using the water and a viscous concentrated sweetener to coarse nuclei of the raw materials. Forming a sintered mixture to form analogous particles by bonding onto the same); And adding an organic enzyme to the raw material to decompose the high molecular weight hydrocarbon of the coke powder into smaller pieces. And burning the coke powder to incorporate the raw material into the sintered cake.

As shown in FIG. 2, the sintering system 2 includes a plurality of air passages 211, a transfer belt 22 surrounding the sintering machine 21, a raw material reservoir 23, and a rotating drum 24 for mixing the raw materials. ), An sintering machine 21 having an ignition furnace 26, a grinder 27, and a pump 28 for pumping combustion air through the air passage 211.

Raw materials including a mixture of particulate iron ore, a solvent, and coke powder are stored in a raw material storage 23. Productivity enhancers, including viscous concentrated sweeteners and organic enzymes, may be added directly to the raw material reservoir 23 (ie, via position 51). Alternatively, the productivity enhancer moves through position 52 (ie, directly into the rotary drum 24), or through position 53 (ie, directly into the slurry recirculation system 4, and then the rotating drum 24. Can be applied directly to the system 2. Raw materials, water, and productivity enhancers are mixed in the rotating drum 24 to form a sintered mixture comprising similar particles. The sinter mixture is then transferred onto the tank 25 and the sinterer 21, or directly onto the sinterer 21. As the coke powder passes through the ignition furnace 26, it is ignited from the top to the bottom of the sintering machine 21.

After passing through the ignition furnace 26, the coke powder is combusted and its temperature reaches 1250-1350 ° C. in the combustion zone, whereby fine particles of analogous particles of the sintered mixture are melted to provide liquid calcium ferrite and wetting properties between the nuclei of the sintered mixture. Form. Cold air is then applied downwards to cause the molten liquid calcium ferrite as binder to solidify the sintered mixture into a sintered cake. The sintered cake is then ground into large and small chunks with a grinder 28. Large or small lumps of size 5 mm or larger are suitable for further smelting processes. Large or small agglomerates (i.e. self-pulverized) with a size of 5 mm or less are recycled to the sintering process.

Table 1 shows the operating conditions, product characteristics, and amount of waste gas of the sintering method in the examples and comparative examples of the present invention. When the coke powder is completely ignited, the coke powder is decomposed into CO ₂ to provide more energy, and if the coke powder is insufficiently ignited, it can be seen that it will be decomposed into CO and cause energy loss.

The results in Table 1 show that the bulk density of each example of the present invention is smaller than that of the comparative example. Productivity is defined as the amount of sintered ore produced per m ² over 24 hours. In Examples 1 to 3 and Examples 4 and 5, the average productivity is at least about 12.6% and 13.1% higher than Comparative Examples 1 and 2.

In addition, since Examples 1 to 5 have a productivity improving agent, the amounts of CO and CO _{2 in} the Examples of the present invention are larger than those of the Comparative Examples. However, in terms of the ratio of CO to CO + CO _2, the ratio of each example is less than that of the comparative example, which means that the combustion of the coke powder is more efficient and complete.

Laboratory scale experiments were used to demonstrate that productivity enhancers can enhance coal combustion efficiency. In this experiment, 10 g of coal was mixed with 0%, 1%, 1.5%, 2% and 3% productivity enhancer and placed in a ceramic crucible and heated for 40 minutes. Temperature (° C.) versus time (minutes) were recorded and the area of time × temperature (° C. × minutes) was calculated and shown. The results of this experiment indicate that the area of time x temperature is 12375, 13415, 13995, 14544 and 14432 (° C. min). This means that the addition of 1%, 1.5%, 2% and 3% productivity enhancer to coal increased the area of time x temperature (° C x min) by 8.4%, 13.0%, 17.5%, and 16.6%, respectively. Typically, a higher magnitude of time x temperature (° C x minutes) means more energy is released in the thermal reactor. That is, combustion is more complete and there is less residue of unburned materials.

In summary, the inclusion of a viscous concentrated sweetener leads to the formation of better analogous particles with reduced bulk density on the sinterer 21, thereby providing more granular porosity and larger gas flow channels, Sufficient combustion air can pass through it, so that combustion efficiency can be increased and combustion time can also be shortened (i.e., to improve the flame forward speed of the combustion zone), thus shortening the sintering time and producing sintering This leads to an increase in speed. In addition, incorporation of organic enzymes can act as a sacrificial catalyst to lower activation energy, increase the rate of combustion, and decompose the high molecular weight hydrocarbons of the coke powder into smaller pieces, making combustion of the coke powder more efficient and complete. In addition, energy efficiency can be increased.

In this way, the remnants of air pollutants such as CO (incomplete combustion materials) and particulates released from the stack conduit gas and unburned material in the ashes of the floating ash or bottoms will be significantly reduced. Thus, productivity enhancers can be used in coal fired power plants for energy savings and reduction of air pollutant emissions. In addition, productivity enhancers can be used in various combustion reactors such as municipal solid waste incinerators, industrial waste incinerators, biological waste incinerators, and medical waste incinerators to improve combustion efficiency, save energy, and reduce air pollutant emissions. .

As described above, using the ore sintering composition and the ore sintering method of the present invention containing a productivity enhancing agent including a viscous concentrated sweetener and an organic enzyme not only increases the productivity significantly, but also the combustion efficiency in the sintering step. Can improve energy consumption, save energy and reduce the release of air pollutants. Therefore, the present invention can be used industrially usefully.

Claims (14)

Particulate ores; solvent; Coke powder; And a productivity enhancer containing a viscous concentrated sweetener. The composition of claim 1, wherein said productivity enhancer further comprises an organic enzyme. The composition of claim 2 further comprising water. 4. The composition of claim 3 wherein the amount of productivity enhancing agent is in the range of 1 to 3 weight percent based on the total weight of the ore sintering composition. The composition of claim 4, wherein the amount of water ranges from 6 to 9 weight percent based on the total weight of the ore sintering composition. The composition of claim 1, wherein said thickening sweetener is selected from the group consisting of molasses, sugar cane syrup, beet syrup, honey, maple sugar, fructose, fructose, and mixtures thereof. The composition of claim 2 wherein said organic enzyme is prepared from bacteria selected from the group consisting of lactic acid bacteria, yeast, actinomycetes and mixtures thereof. 8. The composition of claim 7, wherein said productivity enhancer further comprises an additive selected from the group consisting of chaff, soybean powder, camellia powder, takju, corn powder, potato powder, rice vinegar, trace minerals, or mixtures thereof. 9. The composition of claim 8, wherein said trace inorganics are selected from the group consisting of iron, aluminum, magnesium, silicon, and mixtures thereof. Preparing a raw material containing particulate ore, a solvent, and coke powder; Bonding the fine powder of the raw material through water and a viscous concentrated sweetener onto the coarse nuclei of the raw material to form a sintered mixture to form similar particles; And Combusting the coke powder to incorporate the sintering mixture into a sintered cake Ore sintering method comprising a. The method of claim 10 further comprising, prior to heating, adding an organic enzyme to the raw material to decompose the high molecular weight hydrocarbons of the coke powder into smaller pieces of coke powder. 12. The method of claim 11, wherein the total amount of viscous concentrated sweetener and organic enzyme ranges from 1 to 3 weight percent based on the total weight of raw materials, water, viscous concentrated sweetener and organic enzyme. The method of claim 10 wherein said thickening sweetener is selected from the group consisting of molasses, sugar cane syrup, beet syrup, honey, maple sugar, fructose, fructose, and mixtures thereof. 12. The method of claim 11, wherein said organic enzyme is prepared from bacteria selected from the group consisting of lactic acid bacteria, yeast, actinomycetes, and mixtures thereof.

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