KR20120036175A - Composition of alkali-ion additive for combustion furnace efficiency - Google Patents

Abstract

PURPOSE: An ionic alkali metal additive composition with combustion acceleration and fusing point reduction functions is provided to minimize costs required for raw materials by reducing the use of fuel and cokes. CONSTITUTION: An ionic alkali metal additive composition with combustion acceleration and fusing point reduction functions includes alkali metal compound liquid which is ionized in water. The composition is added in fuel as a heating source. The alkali metal compound is based on one or more alkali metal compound selected from a group including potassium, sodium, and lithium. The alkali metal oxide water dispersed ionized alkali metal in a cation state.

Description

Composition of Alkali-Ion Additive For Combustion Furnace Efficiency}

The present invention relates to an ionic alkali metal additive composition having a function of promoting combustion and lowering the melting point, and more particularly, oxidation and combustion reactions such as coal and coke, which are fuels used as heat sources during combustion in various furnaces used for various purposes. By adding a liquid composition that promotes the high temperature in the furnace, the combustion efficiency is improved by inducing the high temperature to be generated, thereby reducing the amount of fuel used as a heat source due to the combustion according to the high thermal efficiency, Combustion promotion and melting point lowering function to increase productivity in sintering and blast furnace processes by reducing melting point and increasing sintering efficiency while suppressing or eliminating the formation of bird nests formed around the blast furnace race-way. It relates to an ionic alkali metal additive composition having a.

In general, blast furnace operations are the production of pig iron from sintering and steelmaking processes from iron ore. In other words, the blast furnace operation burns iron ore into the various blast furnaces such as reverberation furnace, reverberation furnace, fluidized bed furnace, and FINEX process furnace, and burns them while supplying coke as a heat source. It is applied to produce iron and remove oxygen in iron ore by inducing reducing action.

Here, the coke, which is a heat source, is produced by charging coal in a separate coke oven and heating it at a high temperature (about 1,000 to 1,300 ° C.) for a long time to produce it, which is introduced into the blast furnace in a blast furnace operation and is composed of a compound of iron and oxygen. It is used to serve as a heat source for melting iron ore and at the same time as a reducing agent for separating iron from iron ore.

In the blast furnace operation, the combustion of the furnace is faster, so that a larger amount of heat source must be supplied to increase productivity. However, excessive use of fuel and coke as a heat source narrows the limited space of the blast furnace to reduce the production of unit pig iron in the blast furnace, and coke is considerably expensive in the heat source.

Accordingly, as a method of partially applying the role of the conventional coke, pulverized coal injection equipment (PCI) has been developed and used that can reduce the overall amount of coke and increase the direct reduction rate. In other words, the pulverized coal injection facility is designed to increase the combustion efficiency of the blast furnace by injecting the pulverized coal obtained by the crushing of low quality coal into the blast furnace in order to improve the output per unit volume of the blast furnace and reduce the fuel cost.

However, pulverized coal injection facility (PCI) is normal because the melting efficiency of ash is melted around the lower part of the blast furnace due to the use of fossil fuel (coal, etc.) as a heat source. There was a difficulty driving the blast furnace.

Therefore, in the sintering process, it is necessary to increase productivity by increasing the sintering ability of ore due to the high temperature of heat source and lowering of melting point, and in the blast furnace and blast furnace injection facility (PCI), stable operation and productivity are required due to the formation of high temperature and lower melting point of ash in the blast furnace. In the blast furnace to improve the combustion efficiency, a chemical method is preferable rather than a physical method, and recently, an additive composition for increasing the efficiency of the blast furnace operation through a chemical reaction using an additive as a chemical method has emerged.

In this regard, as a means to increase the efficiency of the blast furnace, by using the combustion catalyst and the oxygen compound added to the fuel used in the pulverized coal injection facility technology to increase the combustion efficiency and thermal efficiency of the blast furnace (Korea Patent Publication No. 10-2002-0075758 Has been developed, and in recent years, the application of alkali metal catalyst, which uses a mixture of alkali metal and oxygen as a combustion catalyst, accelerates the combustion reaction and lowers the melting point, leading to stable operation of the blast furnace. Be productive.

However, as a conventional additive, alkali metals promote combustion in a high temperature combustion state, but are difficult to manage at ordinary temperature without a special device.Alkali oxides that provide oxygen are also unstable at room temperature and are difficult to exist in a liquid state. There was a problem that it is difficult to exert a proper combustion efficiency by using the non-ion state.

Therefore, since a stable and strong ionic liquid additive composition is urgently needed, when ionized alkali metal is used, a large amount of sintered ore is used in the sintered ore due to the improvement of the combustion rate, the formation of high temperature, and the melting point of the ore and ash. The present invention was completed after confirming that it was possible to suppress the formation of high temperature and the formation of a fusion material in the blast furnace in the blast furnace and the employment facility.

The present invention is to solve the above problems, by adding a composition consisting of an ionized liquid alkali metal compound to the fuel used as a heat source in the blast furnace to induce the generation of high temperature according to the acceleration of the oxidation reaction and combustion reaction The purpose of the present invention is to provide an ionic alkali metal additive composition having a combustion promoting and melting point lowering function capable of increasing combustion efficiency and thermal efficiency, and lowering the melting point of ash and ore to increase productivity in the sintering and blast furnace processes. .

In addition, high combustion efficiency and thermal efficiency are exhibited even when the amount of fuel (coal and coke), which is the heat source of the blast furnace, is reduced, thus minimizing the cost of raw materials used in operation by reducing the consumption of fuel along with expensive coke. By operating the blast furnace with a small amount of coke and suppressing the formation of fusions in the blast furnace, the elution of pig iron is performed smoothly, thereby providing an ionic alkali metal additive composition having a combustion promoting and melting point lowering function that can maximize productivity. It is to.

In particular, in the sintering process, limestone (main component: calcium carbonate) is currently used as a melting agent, but by using the additive of the present invention, the burning rate and the melting point are further enhanced, and the sintering property is further improved.

The ionic alkali metal additive composition having a combustion promoting and melting point lowering function proposed by the present invention is added to a fuel used as a heat source during combustion in a blast furnace, and includes an alkali metal compound ionized in water in a liquid state.

The alkali metal compound may be formed of at least one alkali metal compound selected from the group consisting of potassium, sodium, and lithium, and the alkali metal compound may be formed to be used by mixing two or more selected from the alkali metal compounds.

The alkali metal compound of the composition is made such that the alkali metal ionized in the water dispersion state is present in the positive (+) state.

The alkali metal compound is formed of at least one alkali metal compound selected from the group consisting of a compound of hydroxide series, a compound of carbonic acid series, and an oxide compound.

The composition may further comprise an amine-based surfactant which ionizes the alkali metal compound in water.

The composition is composed of 5 to 80 parts by weight of the alkali metal compound, preferably 20 to 35 parts by weight, and more preferably 10 to 25 parts by weight of the alkali metal compound, based on 100 parts by weight of water.

The addition ratio of the composition is a weight ratio of fuel: water: composition = 1000: 2-100: 1-10, preferably 1000: 10-22: 3-5.

According to the ionic alkali metal additive composition having a combustion promoting and melting point lowering function according to the present invention, the ionized alkali metal as a composition added to the fuel forms a ionic state and is widely distributed in the mineral fuel as it is present in the liquid phase in the liquid. It promotes the oxidation reaction and the combustion reaction, which leads to the generation of high temperature, thereby obtaining the effect of improving the combustion efficiency and thermal efficiency.

In addition, since the composition in which the alkali metal forms a liquid phase in the ionic state is added to the fuel and distributed in the fuel, the melting point of the ash and the ore is lowered, thereby improving the productivity of the blast furnace operation.

In addition, high combustion efficiency and thermal efficiency are achieved even with less fuel, thereby reducing the use of relatively expensive coke and overall fuel, minimizing the cost of raw materials, and reducing the amount of fuel. As a result of suppressing the formation of fusion in the blast furnace, it is possible to smoothly dissolve pig iron, thereby maximizing productivity.

1 is a graph showing the amount of coke used before and after addition and no addition in the additive composition according to the present invention.
Figure 2 is a graph showing the pig iron production before and after addition and no addition in the additive composition according to the present invention.

The present invention is to add to the fuel used as a heat source during combustion in the blast furnace, the ionic alkali metal additive composition having a combustion promoting and melting point lowering function comprising an alkali metal compound ionized in water in a liquid state of the technical configuration It features.

In addition, the alkali metal compound is characterized by an ionic alkali metal additive composition having a promoting function and melting point lowering function consisting of at least one alkali metal compound selected from the group consisting of potassium, sodium, lithium.

In addition, the alkali metal compound is characterized by an ionic alkali metal additive composition having a combustion promoting and melting point lowering function to form a mixture of two or more selected from the alkali metal compound to the technical configuration.

In addition, the alkali metal compound of the composition is characterized in that the ionic alkali metal additive composition having a combustion promoting and melting point lowering function is made so that the alkali metal ionized in the water dispersion state in the positive (+) state.

In addition, the alkali metal compound describes an ionic alkali metal additive composition having a combustion promoting and melting point lowering function formed of at least one alkali metal compound selected from the group consisting of a hydroxide compound, a carbonate compound, and an oxide compound. It is characterized by the configuration.

In addition, the composition of the present invention is characterized by an ionic alkali metal additive composition having a combustion promoting and melting point lowering function, which further comprises an amine-based surfactant which ionizes the alkali metal compound in water.

In addition, the composition is 5 to 80 parts by weight of the alkali metal compound, preferably 20 to 35 parts by weight of the alkali metal compound, more preferably 10 to 25 parts by weight based on 100 parts by weight of water. And an ionic alkali metal additive composition having a melting point lowering function.

In addition, the addition ratio of the composition has a weight ratio of fuel: water: composition = 1000: 2 to 100: 1 to 10, preferably a weight ratio of 1000: 10 to 22: 3 to 5, and has a combustion promoting and melting point lowering function. The ionic alkali metal additive composition is characterized by the technical configuration.

Next, the ionic alkali metal additive composition having combustion promoting and melting point lowering functions according to the present invention will be described in detail. However, embodiments of the present invention can be modified in many different forms, the scope of the invention is not to be construed as limited to the embodiments described below. Embodiment of the present invention is provided to explain to those skilled in the art to understand the present invention.

First, the ionic alkali metal additive composition having combustion promoting and melting point lowering functions according to the present invention is used in addition to coal and coke, which is a fuel used as a heat source during combustion in a blast furnace, and is used in a liquid in a certain amount of water. It consists of a composition containing an alkali metal compound ionized with. Of course, other materials that can be ionized other than water, such as a surfactant may be used.

The addition of the composition to the fuel is such that the composition is sufficiently coated on the surface of the fuel. That is, the composition is added to the fuel by spraying the composition evenly toward the fuel or immersing the fuel in the composition. The composition containing the ionized alkali metal compound has a larger surface area than the solid state and the non-ionic state. In addition, it has excellent combustion acceleration and melting point lowering functions.

Alkali metal constituting the alkali metal compound is a generic term for six elements of potassium (K), sodium (Na), lithium (Li), rubidium (Rb), cesium (Cs), Francium (Fr), including similar properties. At room temperature, it reacts with water to generate hydrogen, producing a strong base hydroxide. More specifically, the alkali metal is a silvery white soft metal which loses its luster soon, and has a low specific gravity, a melting point and a boiling point, and has a flame reaction, and is directly active with many nonmetallic elements. In particular, it is a metal that is well combined with oxygen and reacts with hydrogen to form hydrides.

In addition, since alkali metals have a characteristic of reacting with moisture (for example, carbon dioxide, etc.) in the air when they are left in the air as usual, it is preferable to store them in petroleum or paraffin during storage.

The alkali metal compound is composed of at least one alkali metal compound selected from the group consisting of potassium, sodium, and lithium among six alkali metal elements.

The alkali metal compound may be formed by applying one kind of alkali metal compound selected from potassium, sodium, and lithium, and may be formed to mix and use two or more kinds selected from alkali metal compounds of the alkali metal compound. .

When the composition of the metal compound of the alkali metal compound is mixed with two or more kinds, the promotion of combustion by the ionic and catalytic properties synergistically has the effect of further improving the combustion promoting and melting point lowering function of the metal of the alkali metal compound It is preferable to mix and use a compound in 2 or more types.

When mixing two or more kinds of the metal compounds of the alkali metal compound, it is also possible to select and use two or more kinds among the alkali metals of the alkali metal of the metal compound and mix them. , Sodium, lithium) and at least one selected from among rubidium, cesium and francium, which are other alkali metals, may be mixed and used.

The alkali metal compound of the composition is made such that the alkali metal ionized in the water dispersion state is present in the positive (+) state. That is, the alkali metal compound is ionized in the liquid state and is widely distributed in minerals such as fuel and ash as it is present in the liquid (water) in an ionic state such as K +, Na +, or Li +, thereby promoting combustion promoting and melting point lowering functions. .

The alkali metal compound may include at least one alkali metal compound selected from the group consisting of a hydroxide compound, a calcium carbonate compound, and an oxide compound.

When the alkali metal compound is composed of a hydroxide-based compound, a calcium carbonate-based compound, and an oxide-based compound, alumina oxide may be used for the combustion of iron ore of low quality containing a large amount of alumina oxide (Al ₂ O ₃ ) among iron ores. To prevent melting. That is, the alkali metal compound promotes the formation of calcium ferrite to increase the combustion efficiency in burning low-quality iron ore.

The hydroxide-based compound is composed of at least one selected from compounds consisting of potassium hydroxide (KOH), sodium hydroxide (NaOH), lithium hydroxide (LiOH), the hydroxide-based compound is a hydroxide (OH) during combustion As it decomposes, the carbon conversion efficiency is increased to increase the combustion efficiency, and the melting point of the alumina oxide contained in the iron ore is easily removed to suppress the formation or suppress the formation of the fusion.

The compound of the carbonic acid series is potassium carbonate (K ₂ CO ₃ ), sodium carbonate (NaCO ₃ ), lithium carbonate (LiCO ₃ ), potassium hydrogen carbonate (KHCO ₃ ), sodium hydrogen carbonate (NaHCO ₃ ), lithium carbonate (LiHCO ₃ One or more types are selected and comprised from the compound which consists of).

When composed of the carbonic acid-based compound, it generates carbon dioxide (CO ₂ ) during combustion. More specifically, the carbon dioxide generated by the carbonic acid-based compound reacts actively with carbon while contacting the surface of the coke, which is a heat source, and increases the reduction of iron ore as a large amount of carbon monoxide is produced.

The compound of the oxide is potassium oxide (K ₂ O), sodium oxide (Na ₂ O), lithium oxide (Li ₂ O), potassium peroxide (K ₂ O ₂ ), sodium peroxide (Na ₂ O ₂ ), lithium peroxide ( Li ₂ O ₂ ), potassium nitrate (KNO ₃ ), sodium nitrate (NaNO ₃ ), lithium nitrate (LiNO ₃ ) is selected by at least one selected from the compound, and the compound of the oxide generates oxygen during combustion It promotes the reaction with carbon, thereby generating high temperature, thereby improving combustion efficiency and thermal efficiency.

The composition may further comprise an amine-based surfactant which ionizes the alkali metal compound in water. In more detail, it is preferable that the amine-based surfactant is formed of a highly viscous ethanolamine having a hydroxyl group and an amine group and preventing oxygen from being decomposed from the alkali metal compound.

The ethanolamine is hygroscopic and has the ability to absorb carbon dioxide. Examples of the ethanolamine include monoethanolamine (MEA), diethanolami (DEA), triethanolamine (TEA), and the like. It is desirable to.

The triethanolamine serves as a dispersant to reduce the difference in specific gravity between the materials so that the alkali metal compound constituting the composition can be uniformly dispersed in water. That is, when the triethanolamine is mixed with an alkali metal compound having a high pH, the high temperature of the triethanol delays the decomposition of the composition even at a certain high temperature (about 200 ° C) due to combustion due to the high viscosity of the triethanol. When the temperature reaches about 250 ° C., oxygen radicals are rapidly generated to further increase the combustion promoting ability.

As described above, the surfactant may be formed of an amine-based triethanolamine which is excellent in dispersibility and stability while achieving nucleophilicity, and is an ethylenediaminetraacetic acid (EDTA) capable of inducing highly viscous substances and complexes. It is also possible to form.

Minerals combusted using the fuel to which the composition is added are mainly iron ores, but may be applied to include all the minerals applied to the blast furnace industry, without particularly limiting the type of minerals.

In addition, the fuel to which the composition of the present invention is added is described as coal and coke, which is one of the solid fuels, but this does not specifically limit or limit the type of fuel, but it is a solid fuel (for example, coal and coke, biomass, etc.). ), Including all fuels applied to the combustion of liquid fuels (e.g. kerosene, diesel, coal tar, crude oil, liquefied petroleum, etc.), gaseous fuels (e.g. hydrocarbon-based fuels such as natural gas) Applicable In addition, it is not limited to the type of the furnace is combusted by applying the fuel to which the composition is added, the other of the steelmaking furnace (reverberatory furnace matte smelting), fluidized bed furnace, of the Finex method using a powdered fuel It can be applied to all kinds of furnaces.

In addition, the fuel to which the composition is added can be applied to various operations requiring combustion, including blast furnace operation such as sintering and steel making process, and can promote combustion, and especially when applied to pulverized coal injection equipment (PCI) during blast furnace operation. High combustion efficiency can be exhibited.

Looking at the manufacturing method of the present invention as described above, it is prepared to be uniformly dispersed because it is mixed in an content ratio of 5 to 80 parts by weight of the alkali metal compound with respect to 100 parts by weight of water. More specifically, the alkali metal compound is slowly added to and mixed with water, and one or more alkali metal compounds to be added among the alkali metal compounds are sequentially added in accordance with the content ratio to dissolve in water in an ionized state. It is prepared to form.

Preferably, the mixture is dissolved in an amount ratio of 20 to 35 parts by weight of the alkali metal compound with respect to 100 parts by weight of water. Furthermore, it is most preferable that the composition is dissolved and ionized while mixing at a content ratio of 10 to 25 parts by weight of the alkali metal compound with respect to 100 parts by weight of water.

In addition, the amine-based surfactant is added after the addition of the alkali metal compound, preferably added in an amount capable of sufficiently exhibiting dispersibility and stability within a range that does not affect the physical property change of the alkali metal compound.

Method and process for producing the composition is not particularly limited, it is possible to manufacture through the production method and process according to the general mixing.

The composition made according to the above manufacturing method is used in addition to the fuel which is a heat source of combustion, the addition ratio of adding the composition to the fuel is a weight ratio of fuel: water: composition = 1000: 2 ~ 100: 1 ~ 10. Is done.

It is preferable to add and use the composition to the fuel in the weight ratio of fuel: water: composition = 1000: 10-22: 3-5.

At this time, water added with the composition to the fuel serves to increase the contact surface area with the fuel with respect to the composition, and when the addition ratio of the water is too large or too small or the addition ratio of the water is too small to reduce the effect of the combustion promotion do.

After the composition is added to the fuel, it is preferable to go through a drying process so as to dry by applying various drying methods for a sufficient time.

Subsequently, as a result of experimenting with the amount of coke used and pig iron produced in the case of combustion using the fuel to which the composition of the present invention is added and in the case of combustion using the fuel which is not the same, as shown in FIGS. 1 and 2, When the composition was applied, the amount of coke used was reduced and pig iron production was increased.

In more detail, the additives obtained by ionizing potassium carbonate (alkali metal compound) at a rate of 30 kg per 100 kg of water in a blast furnace having a capacity of 500 tons / hour for pig iron production having a pulverized coal injection facility (PCI) 1 'Additive 2', which was applied to potassium carbonate in solid state with the same molar ratio of potassium as the element used in Additive 1, was added at a weight ratio of fuel: water: additive = 1000: 10: 3, and then tested together with the unadded fuel. Coke usage and pig iron production were measured.

As a result, the amount of Cokes used in Additive 1 decreased by 1.6% from 34.7% to 33.1% per ton of iron without addition, and Additive 2 decreased by 0.8% to 33.9%, and iron production decreased from 87.8% to 92.5, respectively. % (4.7% increase) and 90.1% (2.3% increase). The iron ore used in this test was 58.0W% of iron, and the effect could be different depending on the quality of iron ore, coal, coke and operating conditions.

That is, 34.7% and 33.9% were used with the use of unadded fuel and 'Additive 2', respectively, and the amount of coke was reduced to 33.1% with the use of 'Additive 1'. 87.8% (not added) and 90.1% (additive 2), respectively, and increased to 92.5% with 'additive 1' fuel.

Therefore, according to the ionic alkali metal additive composition having a combustion promoting and melting point lowering function according to the present invention configured as described above, as the composition to be added to the fuel ionized alkali metal is in an ionic state and present in the liquid phase in the liquid It is widely distributed in the fuel, which is a mineral, to promote the oxidation reaction and the combustion reaction, which induces the generation of high temperature, thereby making it possible to improve the combustion efficiency and the thermal efficiency.

In addition, since the composition in which the alkali metal forms a liquid phase in the ionic state is added to the fuel and distributed in the fuel, it is possible to increase the productivity of the blast furnace operation by lowering the melting point of the ash and the ore.

In addition, high combustion efficiency and thermal efficiency are achieved even with less fuel, thereby reducing the use of relatively expensive coke and overall fuel, minimizing the cost of raw materials, and reducing the amount of fuel. As it suppresses the formation of fusion in the blast furnace, it is possible to maximize the productivity of the pig iron is smoothly eluted.

Through the following examples, the combustion conditions before and after the addition of the ionic alkali metal additive composition having a combustion promoting and melting point lowering function according to the present invention were measured and measured, respectively. However, the iron ore used in the following examples is iron content of 58.0W%, coal is China anthracite volatiles 16W%, ash 35W%, sulfur 1W%, depending on the operating conditions of the blast furnace, along with the quality of iron ore, coal and coke. And the effect may be different.

Example  1: Combustibility Experiment

In order to prepare an ionic alkali metal additive composition having a function of promoting combustion and lowering the melting point, 'sample 1' (130 kg including water) was prepared by dissolving 30 kg of potassium carbonate (alkali metal compound) in 100 kg of water at room temperature. As sample 2, which is 30 kg of potassium carbonate in a solid state, which was not dissolved, samples 1-2 were prepared to have the same potassium molar ratio.

Subsequently, the samples 1 and 2 prepared above were added and dried in a weight ratio of fuel: water: sample = 1000: 20: 3, and then water was removed for 6 hours or more, and the fuel sample (about 20 mg) was added at 30 ° C. to 800. The combustion start temperature, combustion end temperature, maximum combustion temperature and maximum combustion speed were measured step by step using a thermogravimetric analyzer while burning up to ℃, and compared with the same method as the comparative example (no addition). It was measured and analyzed. The evaluation results are shown in Table 1 below.

Combustibility Experiment division
No addition
Addition Sample 1 Difference Sample 2 Difference Combustion start temperature (℃) 255.4 223.05 -32.35 239.58 -15.82 Combustion end temperature (℃) 504.75 516.34 11.59 517.89 13.14 Maximum combustion temperature (℃) 401.21 419.78 18.57 405.34 4.13 Combustion speed (% / min) 7.215 7.398 0.183 7.087 -0.128

As shown in Table 1, when the fuel is added to the fuel using the ionic alkali metal additive composition having a combustion promoting and melting point lowering function of the present invention (sample 1), the combustion start temperature is compared with that of no addition (no addition). Was lowered to 32.35 ° C. However, in the case of solid state sample 2, the combustion rate temperature was 15.82 ° C lower than that of no addition, and thus the effect of sample 1 ionized to liquid state was 16.53 ° C. In the case of using the composition of the present invention, it can be seen that combustion promotion and combustion efficiency have been significantly improved.

Example  2: melting point experiment

Samples 1 and 2 were prepared and prepared in the same conditions and methods as in Example 1, and the melting point (IDT) was tested by ASTM D 1857 method with coal, and the results are shown in Table 2 below.

Melting Point (IDT) Experiment division
No addition
Addition Sample 1 Difference Sample 2 Difference Melting Point (IDT) 1350.45 1323.43 -27.02 1327.95 -22.5

As shown in Table 2, Sample 1, which is added to the fuel using the ionic alkali metal additive composition having combustion promoting and melting point lowering functions of the present invention, has a melting start temperature as compared with no addition. The melting point was 27.02 ° C., and the sample 2 in the solid state was 22.50 ° C. lower than the no addition in the solid state, and the effect of the sample 1 ionized in the liquid state was 4.52 ° C. more than the sample 2 in the solid state. That is, it can be seen that the more effective in lowering the melting point when using the ionized composition of the present invention.

Example  3: Sinterability  Experiment

[Metric]

① Flame Front Speed (FFS)

The forward speed of the flame is to measure the sintering rate due to the rise of the flame temperature. That is, the rate at which the flame complexed to the raw material surface charged into the blast furnace burned down was measured.

-FFS (mm / min) = (Pallet layer × Pallet speed) / (Effective image length)

② Recovery rate (YI)

The recovery rate was measured by the melting point decrease of the sintered ore and the flame speed.

-YI (%) = ((Dumbling (30 rotations) + 5mm weight (kg)) / total weight of the surface layer sintered ore) x 100

③ Drop strength (SI), low temperature reduction differentiation strength (RDI)

Drop strength and low temperature reduction differentiation strength are to measure the strength increase of sintered ore. That is, the drop strength is an index of cold strength indicating the degree of differentiation during transport from sintering to blast furnace charging, and the low temperature reduction differentiation strength is an index indicating degree of differentiation in the reduction process of the sintered ore charged in the blast furnace.

-SI (%) = (+ 10mm weight after test) / (+ 10mm weight before test) × 100

-RDI (%) = (-3mm weight after test) / (total weight of test) x 100

④ Reduction rate (RI)

Reduction rate is for measuring porosity enhancement and breathability enhancement. That is, it measures by ferrous oxide (B) of a reduced sample.

RI (%) = ((Wo-Wf) / WI (0.43A-0.112B)) × 100

The sintering process was tested by applying the additive composition of the present invention based on the above measurement evaluation criteria. Looking specifically at the experimental example as described above, after preparing a 40kg class sintering port (Sinter Port) T.Fe 58% by weight, SiO ₂ A 'nature' was produced by mixing iron ore powder with 1.2% by weight and 2.97% by weight of Al ₂ O ₃ (more than 2.80) evenly with 10% calcium carbonate and 3% powdered coke.

Next, the characteristics of: water: additive = 500: 10: 3 to make Sample 1 (the ionizing composition of the present invention) and Sample 1 (non-ionization) and the sintering process by heating up to 1300 ℃ with a coke as a heat source under atmospheric pressure conditions Was tested.

Sintered POT Experiment division
No addition
Addition Sample 1 Difference Sample 2 Difference FFS (mm / min) 16.45 18.87 2.42 17.25 0.8 YI (%) 78.87 83.83 4.96 81.45 2.58 SI (%) 87.14 88.62 1.48 87.1 -0.04 RDI (%) 50.67 50.2 -0.47 50.87 0.2 RI (%) 76.35 78.33 1.98 77.3 0.95 Particle size distribution (more than 5mm) 66.42 67.98 1.56 66.58 0.16

The ionized additive of the present invention is accelerated by the high temperature formation and the melting point drop by the acceleration of combustion to accelerate the flame advancement and the melting point of the ore is lowered, resulting in the improvement of the strength and productivity of the sintered ore. This increases the sintering speed due to the increase in the amount of ore melts and the overall sinterability is enhanced by the formation of hard sintered ore. When such a strong sintered ore is introduced into the blast furnace, the efficiency of the blast furnace is improved by ensuring the air permeability of the blast furnace.

Example 3 As shown in Table 3, ionized sample 1 increased 2.42 mm compared to no addition in case of FFF, while non-ionized sample 2 increased only 0.8 mm in case of strength (SI). 1 increased 1.48%, while sample 2 decreased 0.04% and had little effect. In reducible (RI), sample 1 was 1.98% and sample 2 was 0.98%, showing a difference in reducible effect. In this case, it can be seen that Sample 1 was further improved by 2.38% (4.96-2.58) compared to Sample 2.

Claims (10)

An ionic alkali metal additive composition having combustion promoting and melting point reducing ability, which is added to a fuel used as a heat source during combustion in a blast furnace, and comprises alkali metal compounds ionized in water in a liquid state.
The method according to claim 1,
The alkali metal compound is ionic alkali metal additive composition having a combustion promoting and melting point reducing ability, characterized in that consisting of at least one alkali metal compound selected from the group consisting of potassium, sodium, lithium.
The method according to claim 2,
The alkali metal compound is an ionic alkali metal additive composition having a combustion promoting and melting point reducing ability, characterized in that to use by mixing two or more selected from the alkali metal compound.
The method according to claim 1,
The alkali metal compound of the composition is an ionic alkali metal additive composition having a combustion promoting and melting point reducing ability, characterized in that the alkali metal ionized in a water dispersion state is present in a positive (+) state.
The method according to claim 1 or 2,
The alkali metal compound is at least one alkali metal compound selected from the group consisting of a hydroxide compound, a carbonate compound, and an oxide compound.
The method according to claim 5,
The hydroxide compound is at least one selected from the group consisting of potassium hydroxide (KOH), sodium hydroxide (NaOH), lithium hydroxide (LiOH), and the carbonate compound is potassium carbonate (K ₂ CO ₃ ), sodium carbonate (NaCO ₃ ), lithium carbonate (LiCO ₃ ), potassium bicarbonate (KHCO ₃ ), sodium bicarbonate (NaHCO ₃ ), at least one compound selected from lithium carbonate (LiHCO ₃ ) is selected, the compound of the oxide Silver potassium oxide (K ₂ O), sodium oxide (Na ₂ O), lithium oxide (Li ₂ O), potassium peroxide (K ₂ O ₂ ), sodium peroxide (Na ₂ O ₂ ), lithium peroxide (Li ₂ O ₂ ), Potassium nitrate (KNO ₃ ), sodium nitrate (NaNO ₃ ), lithium nitrate (LiNO ₃ ) ionic alkali metal additive composition having a combustion promoting and melting point reducing ability, characterized in that at least one selected from .
The method according to claim 1,
The composition is an ionic alkali metal additive composition having a combustion promoting and melting point reducing ability further comprises an amine-based surfactant to ionize the alkali metal compound.
The method of claim 7,
The amine-based surfactant is triethanolamine (TEA), characterized in that the ionic alkali metal additive composition having a combustion promoting and melting point reducing ability.
The method according to claim 1,
The composition is composed of 5 to 80 parts by weight of an alkali metal compound with respect to 100 parts by weight of water.
The method according to claim 1,
The addition ratio of the composition is fuel: water: composition = 1000: 2 ~ 100 ~ ionic ionic alkali metal additive composition having a melting point reducing ability, characterized in that consisting of: 1 to 10.

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