KR101867432B1 - Recarburizer composition - Google Patents

Abstract

A recarburizer composite is provided, comprising: 25-35 wt% of anthracite; 3-7 wt% of Al powder; and 60-70 wt% of a thermoplastic resin. The recarburizer composite of the present invention can provide the recarburizer composite capable of securing storage stability while generating heat equal to the conventional recarburizer composite while a content of fixed carbon is low.

Description

[0001] Recarburizer composition [0002]

The present invention relates to a carcinogen composition used in an electric furnace operation.

BACKGROUND ART [0002] In the field of steelmaking using an electric furnace for obtaining iron from iron oxide, much research has been conducted in order to secure iron having high purity, increase yield and productivity.

In order to solve this problem, slag preparation and foaming using the slag are performed to separate impurities in the electric furnace and reduce iron oxide.

The composition of the slag contained in the slag contains a high proportion of fixed carbon. A fixed carbon is a pure solid carbon contained within a carbon source such as coal. Fixed carbon means the amount of carbon excluding volatile components, ash and moisture in coal.

The conventional coal tar composition used for slag forming in an electric furnace mainly includes anthracite coal, graphite and coke as main types. Such coal tar coal is pyrolyzed at a high temperature to decompose the CO gas through the FeO reduction in the slag, And further generates heat and steam (H ₂ O) through combustion with oxygen to help slag forming.

In addition, polymeric carbon such as a thermoplastic resin derived from waste plastic may be used as a turbulent flow in the composition for a carbon black. This is to recycle the waste to reduce the production of greenhouse gases such as carbon dioxide.

Apart from this, numerous studies have been conducted on the physical properties, storage stability and thermal efficiency of the composition of the composition of the petroleum gas.

A problem to be solved by the present invention is to provide a carcinogen composition which is different from a conventional carcinogen composition and can secure the storage stability of the composition while generating an equivalent heat amount while having a low fixed carbon content.

In order to solve the above problems, the present invention provides a charcoal composition comprising 25 to 35 wt% of anthracite coal, 3 to 7 wt% of an Al powder, and 60 to 70 wt% of a thermoplastic resin.

The compositions of the present invention can provide a carbon black composition capable of securing storage stability while generating a heat equal to that of the prior art while having a low content of fixed carbon.

Hereinafter, preferred embodiments of the present invention will be described in detail. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, it is to be understood that the constituent features of the embodiments disclosed herein are merely the most preferred embodiments of the present invention, and are not intended to represent all of the inventive concepts of the present invention. Thus, various equivalents and variations And the like.

Throughout the specification, when an element is referred to as " comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

The carbonated composition according to one embodiment of the present invention may contain 25 to 35 wt% of anthracite coal, 3 to 7 wt% of Al powder, and 60 to 70 wt% of a thermoplastic resin.

hard coal

As described above, anthracite, cokes, graphite and the like are contained in the form of gypsum or coal as the carbon source of the carbonitride composition in the conventional electric furnace operation without any limitations. In this case, the above-described carbonated composition is used as a heat energy source since it is put into a high-temperature electric furnace. Most of the cases in which the specific gravity of the fixed carbon occupies not less than 50% by weight in the composition of the carbon black, focusing on the purpose as a heat energy source of the carbon black composition. However, as a result of intensive research, the present inventor has found that the role of the carbon black can be equally performed even if the fixed carbon is contained in the composition of the composition in an amount of about 20 to 30% by weight.

According to an embodiment of the present invention, the carbonizer composition may include 20 to 30% by weight of fixed carbon derived from anthracite.

In the present invention, " fixed carbon " refers to pure solid carbon contained within a carbon source such as coal. Fixed carbon means the amount of carbon excluding volatile components, ash and moisture in coal.

Fixed carbon (%) = 100 - (water (%) + volatile matter (%) + ash%)

The carbon black composition according to an embodiment of the present invention may contain anthracite coal in order to secure the fixed carbon of 20 to 30% by weight as described above.

Anthracite coal is characterized by the highest degree of carbonization of coal, high thermal conductivity and low thermal expansion. Accordingly, the anhydrous coal having such characteristics is used in the composition of the composition of the present invention to secure the thermal stability in the course of thermal shock and volatile matter release during the rapid heating of the composition, The thermal differentiation phenomenon of the composition can be reduced.

In addition, anthracite coal is the most carbonized coal with low ash content, low volatile content and relatively high fixed carbon content. Therefore, the amount of volatile components causing the differentiation in the process of discharging is relatively small, The amount of gasification is small. Anthracite coal also has the economic advantage that it is cheaper than other types of coal materials.

In an alkaline composition according to an embodiment of the present invention, the anthracite coal may be included in an amount of 25 wt% to 35 wt%. If the content of the anthracite coal exceeds 35% by weight, when the amount of carbon, that is, the amount of the soluble carbon present in the slag increases with the amount of the iron oxide, the exothermic phenomenon caused by the combination of carbon and oxygen in the electric furnace It is possible to reduce the recovery rate of pure iron formed from the iron oxide by the excessive occurrence of the boiling phenomenon. When the amount is less than 25% by weight, the ratio of the fixed carbon to the carbonizer composition is lowered, The fixed carbon can not be kept constant and the recovery rate of pure iron can be lowered.

The anthracite coal may be a fine powder having an average particle diameter (D ₅₀ ) of 0.01 mm to 4.0 mm. When the average particle diameter (D ₅₀ ) of the anthracite coal exceeds 4.0 mm, the hot quality of the coal tar composition may be rather deteriorated.

In addition, the anthracite coal may have a volatile content of 3 to 7% by weight, specifically 3 to 4% by weight. When the amount of volatiles is too small, it is impossible to supply a reducing gas necessary for reduction of iron ore by charging the composition of the carbonitride prepared from an anthracite of fine powder into an electric furnace, and when the amount of volatiles is too large, It is difficult to sufficiently secure the heat source required for melting the reduced iron charged into the melting and gasifying furnace.

Al powder

The alkaline composition according to one embodiment of the present invention may contain Al powder to ensure the storage stability of the composition and the gasification efficiency.

The Al powder can be charged in the form of a composition in the steelmaking process of an electric furnace containing an oxide of iron oxide or other metal element, so that it can react with oxygen gas or metal oxide, specifically oxygen in the iron oxide molecule, All of the reactions correspond to exothermic reactions. The heat of reaction can be used almost as it is for steelmaking energy, which can increase the energy efficiency of steelmaking. Due to such an effect, even when the content of the fixed carbon in the above-mentioned composition for a gasket is low, the desired thermal efficiency can be obtained.

In addition, when carbides or the like are formed by the reaction of the metal oxide and the carbon component, volumetric expansion accompanies the metal oxides and carbides, and these densities are accelerated by filling the pores formed in the molten material in the electric furnace, It is possible to prevent the intrusion of the oxidizing gas from the oxidizing gas.

To this end, the alkaline powder composition according to one embodiment of the present invention is effective in that the reaction can proceed easily and be obtained at low cost by including Al powder. Al ₄ C ₃ or Al ₂ OC is produced at the temperature rising temperature, and Al ₂ O ₃ is changed at a high temperature, so that the above-mentioned effect can be exhibited. For this effect, according to an embodiment of the present invention, the Al powder may be contained in an amount of 3 to 7% by weight in the composition. In addition, the alkaline powder composition according to an embodiment of the present invention may further include alumina (Al ₂ O ₃ ) by oxidizing a part of the Al powder.

Further, since the Al powder is included in the catalyst composition according to an embodiment of the present invention, when the catalyst composition is stored for a long period of time, the Al powder acts as a strong antioxidant, so that even after a long period of time , The thermal efficiency can be maintained constant without deterioration.

When the Al powder is added in the form of a coagulant, there is a problem in that it is not uniformly distributed in the composition or in the aspect of reactivity. Therefore, in order to prevent the oxidation by the Al powder (to secure storage stability) and to secure the heat of reaction, it is preferable to add the Al powder in the form of fine powder to secure a large effective reaction area per unit amount. However, since the too fine Al powder has an excessively strong affinity for oxygen and is liable to explode at the time of handling, it is preferable to set the average particle diameter (D ₅₀ ) to 0.001 mm to 1.0 mm in order to ensure safety .

Thermoplastic resin

The thermoplastic resin may be one or more selected from the group consisting of a polyethylene resin, a polypropylene resin, a polystyrene resin, and a poly (ethylene terephthalate) resin in the composition of the present invention, , And the thermoplastic resin may be polyethylene.

The thermoplastic resin can be derived from resources such as waste plastics, which can be eco-friendly in terms of resource recycling.

Further, the thermoplastic resin according to one embodiment of the present invention can be used as a heat energy source in addition to the above-described anthracite coal in the composition for a chemical composition. In addition, the composition can be thermally melted during the production of the composition to serve as a binder between components of the composition. For this purpose, the thermoplastic resin may contain 60 to 70% by weight of the thermoplastic resin in the composition. If the amount of the thermoplastic resin is less than 60% by weight, it may cause excessive boiling phenomenon depending on the content of the fixed carbon. If the thermoplastic resin is more than 70% by weight, It is used for the purpose of preventing excessive oxidation, that is, preventing the oxidation of scrap metal to improve the recovery rate and inducing an exothermic reaction by binding with oxygen. At this time, when the fixed carbon content is low, the recovery rate may be lowered and the thermal efficiency may be lowered, resulting in a decrease in the quality of the produced product.

In the thus obtained carbonated composition, the thermoplastic resin is uniformly dispersed and mixed between the anthracite coal and the Al powder, and melted to form a coating layer on a part of the Al powder. Therefore, the above-described carbonated composition according to an embodiment of the present invention can prevent the Al powder from being easily oxidized due to the exposure of the air due to the formation of the coating layer of the thermoplastic resin. In addition, when the composition of the present invention is added to an electric furnace, hydrogen atoms and carbon atoms in the thermoplastic resin react quickly, and the metal oxides can be efficiently reduced.

In order to cause the polyolefin-based resin to be uniformly dispersed and surrounded between the respective components in the composition, the granular composition according to one embodiment of the present invention uses a differentiated anthracite as well as the particle size of the thermoplastic resin It is preferable to strictly control. The thermoplastic resin preferably has an average particle diameter (D ₅₀ ) of 0.01 mm to 5 mm for uniform mixing and serving as a binder and a coating layer formed on the Al powder

METHOD FOR PREPARING CHEMICAL COMPOSI

A method for producing a carbon black composition according to an embodiment of the present invention comprises the steps of: a) mixing 25 to 35 wt% of anthracite coal, 3 to 7 wt% of Al powder, and 60 to 70 wt% of a thermoplastic resin to form a composition; b Heating and drying the composition; And c) subjecting the composition to extrusion molding.

In the mixing step, the anthracite coal, the thermoplastic resin, and the Al powder are respectively weighed and mixed in a high-speed rotary mixer sealed by a vacuum feeder, for example, Jiangsu Province Zhangjiagang Baomachine SRL-Z100 / 200, China .

In the drying step, the temperature of the drying chamber is adjusted to 107 ° C, and then a predetermined weight (about 1 g) of the sample is weighed into a drying container for which the weight is known, and the surface is flattened. The lid of the drying vessel is opened, inserted into the drying chamber, and heated for 4 hours from the time of insertion.

After mixing in the high-speed rotary mixer at a temperature of 120 ° C for about 20 minutes, the mixture can be transferred to a hopper for extrusion through a screw feeder for extrusion molding, and the moisture content of the mixed- It can be controlled to 0.5% by weight or less in order to increase the ratio.

The mixed raw materials can be extruded at a high pressure in a twin-screw twin extruder, for example, at a temperature of 150 ° C to 240 ° C by feeding the mixture to a 110kw dc TE-75/40 of the Chinese longevity Zhangjiagang. At this time, it is preferable that the raw material is 0.5 wt% or less of water. The kneading effect due to moisture in the extruder at high temperature and high pressure may be lowered and the molding rate may be lowered.

A rotating blade is attached to the extruded part to cut the molded article to a certain size to increase the cooling efficiency. The formed and cut raw materials can be slowly cooled in an air cooling method.

The thus prepared carbon black composition may have a porosity of 15 vol% to 19 vol%. More preferably, the porosity may be between 16 vol% and 17 vol%. If the porosity of the composition is too small, it is difficult to form a passage through which the volatile component can be discharged from the composition for casting into the electric furnace when the composition is charged into the electric furnace, so that the composition of the composition does not sufficiently supply the heat required for melting the iron oxide It can be disassembled immediately. In addition, when the porosity of the composition is too high, the cold strength of the composition is not sufficiently secured, and the composition may be broken during the transportation. Therefore, it is preferable to maintain the porosity of the briquette in the above-mentioned range.

The porosity of such a catalyst composition can be calculated by the following equation (1). Here, the true density means a value obtained by dividing the mass of the composition by measuring the volume of a pure sample except for all the open pores existing in the sample of the composition. In addition, the apparent density means a value obtained by dividing the mass of the carbon black composition by the volume of the carbon black composition itself including the voids contained in the carbon black composition.

[Equation 1]

Porosity = (true density - apparent density) / true density x 100

On the other hand, the true density of the carbon black composition may be 1.0 g / cm ³ to 1.3 g / cm ³ . More preferably, the true density of the seonghyeongtan may be 1.16g / cm ³ to 1.25g / cm ^3. When the true density of the composition is too large, the cold strength of the composition may be lowered. In addition, when the true density of the composition is too low, a passageway through which volatile components can escape from the composition can not be formed when the composition is charged into an electric furnace, so that the composition can be immediately decomposed. Therefore, it is preferable to keep the true density of the charcoal composition in the above-mentioned range.

[Example]

Hereinafter, the present invention will be described concretely with reference to embodiments of the present invention, but the present invention is not limited to these embodiments.

Using the above-described method for producing a catalyst composition, a catalyst composition was prepared in the composition ratio shown in Table 1 below.

Example  1 to 5 and Comparative Example  1 to 6

division Composition ratio Average particle size (D ₅₀ , mm) Carbon black composition hard coal Polyethylene resin Al powder hard coal Polyethylene resin Al powder Porosity (%) True density (g / cm ³⁾ Example 1 30 65 5 2.5 4.0 0.7 17.0 1.16 Example 2 25 70 5 3.0 4.5 0.7 15.5 1.21 Example 3 35 60 5 2.5 4.0 0.7 16.6 1.13 Example 4 27 70 3 3.0 4.0 0.7 16.0 1.21 Example 5 25 78 7 2 4.0 0.7 15.1 1.25 Comparative Example 1 50 50 - 2.5 4.0 - 23.8 1.0 Comparative Example 2 30 70 - 6 6 - 25.2 1.02 Comparative Example 3 15 80 5 3.0 4.0 0.7 7.1 1.38 Comparative Example 4 40 55 5 3.0 4.0 0.7 23.0 1.04 Comparative Example 5 30 60 10 3.0 4.0 0.7 19.3 1.11 Comparative Example 6 70 30 - 3.0 4.0 - Composition not formable

[evaluation]

(1) Evaluation of thermal efficiency

The thermal efficiency is shown in Table 2 based on the method of measuring calorific value of coal and coke based on KS E3707. The apparatus and apparatus used are automatic calorimeters. The bombardment material used for the body and lid interior was stainless steel STS 304 or a material having mechanical properties equal to or greater than that of the stainless steel STS 304, while the inner surface thereof was not corroded by the acid generated by the combustion of the sample.

(2) Evaluation of storage stability

The thermal efficiency of the compositions of the compositions of the examples and comparative examples prepared above and the compositions of the compositions of the compositions after leaving for 60 days at room temperature were measured.

 (3) Confirmation of presence of boiling phenomenon

The compositions of the compositions prepared in Examples 1 to 5 and Comparative Examples 1 to 6 were actually charged into an electric furnace and operated. After 25 minutes to 35 minutes of reaction time, the amount of bubbles formed on the slag surface of the electric furnace was measured to confirm the presence of boiling phenomenon. Depending on the generation strength of the bubbles, it is indicated as steel or heavy.

(4) Measurement of recovery rate

The amount of iron oxide to be added to the first electric furnace was measured, and the amount of the pure iron (Fe) contained in the iron oxide was calculated. Then, the weight of pure iron recovered after the completion of the process was measured to calculate the recovery rate .

(5) Power source unit

The cost of each component included in the composition of the composition was calculated based on the date of March 31, 2014, and the cost per ton was calculated in won.

division Thermal efficiency (kcal) Thermal efficiency
Retention rate (%) Check for boiling phenomenon Recovery rate (%) Power source unit
(Price per ton, KRW) first 60 days later After 60 days /
Initial * 100 (%) Example 1 8479 8454 99.7 about 94.31 369.7 Example 2 8736 8730 99.9 about 93.66 368.8 Example 3 8220 8198 99.7 about 92.26 374.4 Example 4 8841 8836 99.9 about 93.53 372.3 Example 5 9560 9545 99.8 about 90.46 360.8 Comparative Example 1 8010 7465 93.1 River 91.44 403.4 Comparative Example 2 9015 8620 95.6 about 90.22 371.9 Comparative Example 3 9220 8905 96.6 about 85.78 368.9 Comparative Example 4 7978 7470 93.6 River 92.33 402.3 Comparative Example 5 7955 7655 96.2 medium 93.03 401.8 Comparative Example 6 The composition of the composition of the gasket was impossible.

As can be seen from the above, it can be seen that the tarnish composition according to one embodiment of the present invention has a very high thermal efficiency retention rate during a storage period of 60 days at room temperature. In addition, the recovery rate of pure iron is minimized while minimizing the boiling phenomenon It was confirmed that it was high.

In addition, it was confirmed that the price per tonne per unit of power source is more efficient than that of the conventional carbonitride composition.

Claims (8)

25 to 35% by weight of anthracite,
3 to 7% by weight of an Al powder having an average particle diameter (D ₅₀ ) of 0.001 mm to 1.0 mm, and
And 60 to 70% by weight of a thermoplastic resin,
And a coating layer derived from the thermoplastic resin is formed on a part of the Al powder. The method according to claim 1,
Wherein the carbon black composition comprises 20 to 30 wt% of fixed carbon derived from anthracite. The method according to claim 1,
Wherein the anthracite coal is a fine powder having an average particle diameter (D ₅₀ ) of 0.01 mm to 4.0 mm. The method according to claim 1,
Wherein the anthracite coal has a volatile content of 3 to 7 wt%. delete The method according to claim 1,
Wherein the thermoplastic resin comprises at least one selected from the group consisting of a polyethylene resin, a polypropylene resin, a polystyrene resin and a poly (ethylene terephthalate) resin. The method according to claim 1,
Wherein the alkaline composition further comprises alumina (Al ₂ O ₃ ). a) mixing the composition with an anthracite powder (25 to 35 wt%), an Al powder having an average particle diameter (D ₅₀ ) of 0.001 to 1.0 mm in an amount of 3 to 7 wt%, and a thermoplastic resin in an amount of 60 to 70 wt%;
b) heating and drying the composition; And
c) subjecting the composition to extrusion molding,
And a coating layer derived from the thermoplastic resin is formed on a part of the Al powder.