KR102466288B1 - Manufacturing apparatus for molded articles, method thereof and molded articles - Google Patents

Abstract

The present invention relates to a molded article manufacturing facility, a molded article manufacturing method, and a molded article, the process of preparing slag; The process of preparing plastic; process of preparing heartwood; attaching the plastic to at least a portion of the slag to prepare a slag-plastic composite; Extruding a mixture of the slag-plastic composite and plastic, supplying the core material to the mixture, and manufacturing a molded body having the core material embedded therein, suppressing damage to equipment during extrusion, and strength of the molded body can be further improved.

Description

Manufacturing apparatus for molded articles, method thereof and molded articles}

The present invention relates to a molded article manufacturing facility, a molded article manufacturing method, and a molded article, and more particularly, a molded article manufacturing facility capable of manufacturing a molded article with excellent mechanical properties by utilizing by-products and waste plastics generated in steelworks, a molded article manufacturing method, and a molded article. It is about.

The steelmaking process generates a large amount of various kinds of by-products while manufacturing steel products. One example of these by-products is slag, and slag can be largely classified into blast furnace slag, steelmaking slag, and ferronickel slag. Blast furnace slag is a molten non-ferrous component included in iron ore, coke, and limestone charged into a blast furnace, and contains a large amount of CaO and SiO ₂ . Such blast furnace slag is mainly used as a material for construction by being used as a cement raw material, fertilizer, paint, and aggregate for civil engineering. Steelmaking slag, like blast furnace slag, contains a large amount of CaO and SiO ₂ , and similarly to blast furnace slag, it is recycled as a building material. However, in the case of blast furnace slag and steelmaking slag, since the content of CaO is high and the water absorption rate is high, the structure constructed using them has a problem of low mechanical properties such as strength and wear resistance. In addition, since most of the blast furnace slag and steelmaking slag are disposed of in landfills, a method for utilizing them in various ways is required.

Meanwhile, ferronickel slag is generated in the process of producing ferronickel molten steel and contains a large amount of SiO ₂ and MgO. Unlike blast furnace slag and steelmaking slag, ferronickel slag has a very low CaO content, low moisture absorption and high hardness, so that the wear resistance of a structure constructed using it can be improved. However, when forming a building material by molding ferronickel slag, there is a problem in that the hardness of the ferronickel slag is high and easily wears the molding equipment to reduce the life of the molding equipment.

KR 10-1998-044182 A KR 10-1183181 B

The present invention provides a molded article manufacturing facility, a molded article manufacturing method, and a molded article capable of improving the durability and lifespan of the facility.

The present invention provides a molded article manufacturing facility, a molded article manufacturing method, and a molded article capable of manufacturing a molded article with excellent mechanical properties.

The present invention provides a molded article manufacturing facility, a molded article manufacturing method, and a molded article capable of reducing manufacturing costs and reducing environmental pollution.

A molded body manufacturing method according to an embodiment of the present invention includes a process of preparing slag; The process of preparing plastic; process of preparing heartwood; attaching the plastic to at least a portion of the slag to prepare a slag-plastic composite; and extruding a mixture of the slag-plastic composite and plastic, and supplying the core material to the mixture to manufacture a molded body in which the core material is embedded.

The process of preparing the slag may include a component adjustment process of adjusting the CaO content of the slag.

The process of preparing the plastic may include collecting waste plastic; and crushing the waste plastic.

The process of preparing the core material may include preparing a core material containing a material having a higher melting point than the plastic.

The manufacturing of the slag-plastic composite may include heating the slag to have a temperature equal to or higher than the melting point of the plastic; Injecting the plastic into the heated slag; and attaching plastic to the surface of the heated slag.

The process of adding the plastic to the heated slag may include adding 5 to 10% by weight of plastic based on the total sum of the heated slag and the plastic.

The manufacturing of the slag-plastic composite may include maintaining the temperature of the heated slag at a temperature equal to or higher than the melting point of the plastic; stirring the heated slag and the plastic to bring the plastic into contact with the heated slag, and melting the plastic using the heat of the heated slag; and attaching molten plastic to the surface of the heated slag.

The process of manufacturing the molded body may include a process of preparing a slag-plastic composite of 30 to 80% by weight based on the total sum of the slag-plastic composite and the plastic.

The process of manufacturing the molded body may include extruding the mixture at a temperature equal to or higher than the melting temperature of the plastic, and contacting the core material with a melt of the mixture.

The process of supplying the core material may include: supplying the core material to the mixture from the rear in the extrusion direction of the mixture; and automatically supplying the core material into the mixture by using the extruding force of the mixture.

The process of supplying the core material may include supplying a plurality of core materials so as to be spaced apart from each other in the mixture.

The process of preparing the slag may include a process of preparing ferronickel slag generated in the process of manufacturing molten ferronickel steel.

A molded body manufacturing facility according to an embodiment of the present invention includes a coating unit capable of producing a slag-plastic composite by attaching a melted material of plastic to the surface of slag; a molding unit for producing a molded body by melting and extruding a mixture of the slag-plastic composite and plastic; and a core material supply unit for supplying a core material from the outside of the forming unit to the inside of the forming unit.

The coating unit is rotatable, and a coating container forming a space capable of accommodating the slag therein; and a first heating means formed in the coating vessel to heat the slag.

The molding unit may include a screw having a through hole penetrating the inside thereof.

The core material supply unit may be installed at the rear of the molding unit to supply the core material to the through-hole in a direction in which the mixture is extruded.

A molded article according to an embodiment of the present invention is plastic; slag arranged to be dispersed in the form of particles in the plastic; and a core material disposed to cross the inside.

Both ends of the core material may be exposed to the outside.

The core material may include a material having a higher melting point than the plastic.

The slag may contain 10% by weight or less of CaO based on the total amount of the slag, include at least one of blast furnace slag, steelmaking slag, and ferronickel slag, and the plastic may include waste plastic.

The plastic may include at least one of polyethylene (PolyEthylene, PE), polypropylene (PP), polystyrene (PS), and polycarbonate (PC).

According to an embodiment of the present invention, a molded article having excellent mechanical properties can be manufactured using slag and waste plastic generated in the steelmaking process. In addition, by forming a core material inside the molded body, mechanical properties of the molded body can be further improved. Such a molded body can be used as a building material, civil engineering material, etc., and has excellent strength, corrosion resistance, etc., and can improve the impact resistance, durability and lifespan of a structure constructed using the same. In addition, since the molded body in which the core material is embedded does not easily break or form pieces even when subjected to external impact, safety accidents that may occur due to pieces of the molded body can be prevented in advance.

In addition, when a mixture of slag and waste plastic is extruded to produce a molded body, it is possible to suppress a phenomenon in which the slag directly contacts the inner surface of the screw and the extruder body and wears the screw and the extruder body. Therefore, since the replacement or maintenance period can be extended by extending the life of the screw and the extruder body, the cost required to repair or replace the equipment can be reduced.

In addition, since high value-added products are manufactured using waste, the cost of treating waste and the cost of manufacturing products can be reduced.

1 is a view schematically showing a molded product manufacturing facility according to an embodiment of the present invention.
Figure 2 is a flow chart showing the process of manufacturing a molded body sequentially by the molded body manufacturing method according to an embodiment of the present invention.
3 is a flow chart sequentially showing a process of manufacturing a slag-plastic composite in the method for manufacturing a molded body according to an embodiment of the present invention.
4 is a view conceptually showing a molded body manufactured by a molded body manufacturing method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only these embodiments will complete the disclosure of the present invention, and will fully cover the scope of the invention to those skilled in the art. It is provided to inform you. Like reference numerals designate like elements in the drawings.

The present invention relates to a technique for manufacturing a product having excellent mechanical properties by using slag generated in a steelmaking process and waste plastic collected from household waste, industrial waste, and the like. Hereinafter, an example in which a molded body used as a building material, a civil engineering material, etc. is manufactured from slag and waste plastic, and a core material is formed inside the molded body will be described. Here, the slag may contain 10% by weight or less of CaO based on the total weight of the slag, and the waste plastic may include a thermoplastic that melts when heated and changes back to a solid state when cooled. In addition, the core material may include a material having a higher melting point than waste plastic and having ductility.

1 is a view schematically showing a molded product manufacturing facility according to an embodiment of the present invention.

Referring to FIG. 1, a molded product manufacturing facility according to an embodiment of the present invention includes a coating unit 100 capable of forming a slag-plastic composite by forming a plastic coating layer on the surface of slag, and extruding the slag-plastic composite and plastic. It may include a molding unit 300 for forming the molded body E and a core material supply unit 500 for supplying a core material W from the outside of the molding unit 300 to the inside of the molding unit 300. In addition, the molded article manufacturing equipment may include a control unit (not shown) for controlling the temperature of the molded part 300 and a cutting part 400 for cutting the molded object.

The coating unit 100 may form a slag-plastic composite by attaching plastic, for example, waste plastic, to the surface of the slag.

The coating unit 100 includes a coater 110 capable of heating slag and attaching plastic to the surface of the heated slag to form a slag-plastic composite, and a cooler 120 capable of cooling the slag-plastic composite. can include In addition, the coating unit 100 may further include a crusher (not shown) capable of crushing the slag-plastic composite as needed.

The coating machine 110 may include a coating vessel 112 forming a space capable of accommodating slag and plastic therein, and a first heating means 114 capable of heating the space inside the coating vessel 112. have. At this time, the coating vessel 112 may be rotatably formed to mix or stir the slag and plastic accommodated therein. For example, the coating container 112 may include a drum mixer that can be tilted to one side and rotated. The first heating unit 114 may be formed in the coating vessel 112 to heat the coating vessel 112 . At this time, the first heating means 114 may heat the coating container 112 so that the slag accommodated inside the coating container 112 can be heated to a temperature equal to or higher than the melting point of plastic. When slag is introduced into the coating container 112 through this configuration, the slag can be heated to a temperature equal to or higher than the melting point of plastic by using the first heating means 114 while rotating the coating container 112 . Also, when the plastic is put into the coating vessel 112, the plastic is melted by the heat of the heated slag and adhered to the surface of the slag to form a slag-plastic composite.

The cooler 120 may cool the slag-plastic composite formed in the coating container 112 . The cooler 120 may include a cooling vessel 122 forming a space capable of accommodating the slag-plastic composite and a cooling means 124 capable of cooling the space inside the cooling vessel 122 . The cooling container 122 may be formed to be rotatable so that the slag-plastic composite accommodated therein can flow. For example, the cooling vessel 122 may include a drum mixer that can tilt and rotate on one side like the coating vessel 112 . Also, the cooling means 124 may be formed in the cooling container 122 to cool the cooling container 122 . Through this configuration, when the slag-plastic composite is discharged from the coating container 112 to the cooling container 122, the cooling container 122 can be rotated to flow the slag-plastic composite. Accordingly, the slag-plastic composite can be uniformly cooled while being in contact with the inner wall of the cooling container 122 .

Meanwhile, the slag-plastic composite may be formed by melting and attaching a plastic, for example, a coating plastic to the surface of the slag. Accordingly, the slag-plastic composite particles are not formed in the form of particles, but the slag-plastic composite particles are entangled with each other by the molten plastic to form lumps. However, in the process of cooling the slag-plastic composite, as the slag-plastic composites collide with each other, the slag-plastic composite lump may be broken to form slag-plastic composite particles. However, the mass of the slag-plastic composite may not be separated into particles of the slag-plastic composite. Therefore, when the slag-plastic composite is cooled, the slag-plastic composite lump may be crushed and separated into particles using a crusher, if necessary.

The molding unit 300 may manufacture the molded body E by extruding the slag-plastic composite, plastic, for example, plastic for filling, and the core material W.

The molding unit 300 includes an extruder body 312 forming a space capable of accommodating the slag-plastic composite and plastic, a screw 330 rotatably formed inside the extruder body 312, and an extruder body 312. It may include a die 320 connected to. In addition, the molding unit 300 may include a second heating unit 340 formed on the extruder body 312 to heat the slag-plastic composite and the plastic accommodated in the extruder body 312 . Also, the molding unit 300 may include a mixing container (not shown) for uniformly mixing the slag-plastic composite and the plastic before inputting the slag-plastic composite and the plastic into the extruder body 312 .

Extruder body 312 is a slag-plastic composite and a plastic or slag-plastic composite And a space capable of accommodating a mixture containing plastic is formed, and may be formed in a hollow shape extending in one direction, for example, a horizontal direction. The extruder body 312 may be formed in a substantially cylindrical shape with both sides open, and an inlet 314 for injecting a mixture including the slag-plastic composite and the plastic may be formed at an upper portion of one side. In order to easily inject the mixture into the extruder body 312, the inlet 314 may be formed in a funnel shape or a hopper shape. At this time, the other side spaced apart from the inlet 314 in the extruder body 312 may be opened and used as an outlet 316 capable of discharging the mixture.

The die 320 may be connected to the outlet 316 of the extruder body 312 and may be formed in a hollow shape with both sides open. At this time, the side from which the mixture is extruded from the die 320 is an extrusion hole (not shown), and the extrusion hole may be formed to have a smaller inner diameter than the inner diameter of the extruder body 312 . In the die 320, the interior space of the die 320 may be formed in various shapes so that the mixture of the slag-plastic composite and the plastic may be formed into a molded body E having a desired shape. For example, when forming the molded body E to have a rectangular plate shape, the inner space of the die 320 may be formed to have a cross-sectional shape of a rectangular slit shape. Alternatively, when the molded object E is formed to have a cylindrical bar shape, the inner space of the die 320 may be formed to have a circular cross-sectional shape.

The second heating means 340 may be formed on the extruder body 312 to heat the extruder body 312 . The second heating means 340 may heat the plastic to a temperature equal to or higher than the melting point, and may be formed along the longitudinal direction of the extruder body 312 so that the plastic may maintain a temperature equal to or higher than the melting point inside the extruder body 312 .

The screw 330 may be disposed inside the extruder body 312 along a direction in which the extruder body 312 extends. At this time, one side of the screw 330 is arranged to extend to the outside of the extruder body 312, and can be rotatably connected to one open side of the extruder body 312 through a connecting means 331 such as a bearing. Also, the other side of the screw 330 may be disposed to extend to a connection portion between the extruder body 312 and the die 320 . An actuator 332 providing power for rotating the screw 330 may be connected to the screw 330 . The driver 332 may be connected to one side of the screw 330 exposed to the outside from the other side of the extruder body 321 . The screw 330 is rotated by the driver 332, and the mixture injected into the extruder body 312 is moved toward the discharge port 316 to be extruded out of the extruder body 312 through the die 320. . In addition, a through hole 334 may be formed along the direction in which the screw 330 extends so as to accommodate the core material W therein. The through hole 334 may be in communication with the outside on the connecting means 331 side, for example, one side of the extruder body 312, and communicate with the inner space of the extruder body 312 on the die 320 side. At this time, the through-hole 334 may be formed in various shapes such as a circular shape and a polygonal shape. In addition, the through hole 334 may be formed to have a smaller diameter than the diameter of the extrusion hole of the die 320 . The core material supply unit 500 may be installed on one side of the extruder body 312, for example, on the side where the driver 332 is disposed. Alternatively, the core material supply unit 500 may be installed at the rear of the extruder body 312 in the direction in which the mixture is extruded. The core material supply unit 500 may be formed to wind and unwind the wire-shaped core material W. Here, the core material W may be formed of a material having a melting point higher than that of plastic and having ductility. For example, the core material W may include a metal material such as aluminum, copper, iron, or the like, or may include a fiber such as cotton yarn. The core material (W) may be formed to have a thickness smaller than the width or thickness of the molded body, for example, about 0.1 to 3 mm. The core material W is inserted into the molded body to increase the strength of the molded body, and may play a role of suppressing or preventing pieces of the molded body from falling apart when the molded body is damaged.

The core material supply unit 500 may supply the core material W into the through hole 334 . At this time, the core material supply unit 500 includes a separate driving means (not shown) that can be controlled by the control unit, so that the mixture of the slag-plastic composite and the plastic is extruded at the same speed as the through-hole 334. A core material W may be supplied. Alternatively, the core material supply unit 500 may automatically unwind the core material W by a force that extrudes the mixture of the slag-plastic composite and plastic when the core material W contacts or adheres to the mixture of the slag-plastic composite and the plastic. may be formed so that

The controller may control the second heating unit 340 to adjust the temperature of the extruder body 312 in the direction in which the extruder body 312 extends or in the direction in which the mixture of the slag-plastic composite and the plastic is extruded. That is, when the slag-plastic composite is injected into the extruder body 312, if the temperature at the injection port 314 is too high, the plastic on the surface of the composite may be rapidly melted. In this case, the slag forming the slag-plastic composite is exposed and can come into contact with the screw 330 and the extruder body 312 as the screw 330 rotates. Due to this, the inner surface of the screw 330 and the extruder body 312 may be worn. In addition, when the slag forming the slag-plastic composite is exposed, the slag and the molten plastic are separated into solid and liquid due to the difference in specific gravity between the slag and the plastic, so that the slag may not be uniformly dispersed in the molten plastic. Therefore, the control unit can control the second heating means 340 to adjust the temperature of the outlet 316 side where the mixture is extruded higher than the temperature of the inlet 314 side where the mixture is injected in the extruder body 312. Alternatively, the control unit may control the second heating unit 340 so that the temperature of the extruder body 312 increases from the inlet 314 through which the mixture is injected to the outlet 316 through which the mixture is extruded. Through this, the melting point of the plastic constituting the slag-plastic composite can be delayed. Accordingly, the contact time of the slag of the slag-plastic composite with the inner surfaces of the screw 330 and the extruder body 312 is shortened, thereby reducing a phenomenon in which the inner surfaces of the screw 330 and the extruder body 312 are abraded. In addition, the slag or slag-plastic composite can be uniformly dispersed in the molten plastic, so that the quality of the molded article can be improved.

In addition, the control unit may control the operation of the core material supply unit 500, for example, the driving means of the core material supply unit 500 and the driver 332 of the molding unit 300. That is, when the core material supply unit 500 can adjust the supply speed of the core material W by using the driving means, the control unit controls the operation of the driving means of the core material supply unit 500 and the driver 332 of the molding unit 300. It is possible to control the extrusion rate of the mixture and the supply rate of the core material (W) by controlling.

Through this configuration, the mixture and the core material (W) are supplied into the extruder body 312, and then moved along the inside of the extruder body 312 by the rotation of the screw 330, through the die 320, the extruder body 312 ) It can be extruded to the outside and manufactured as a molded body (E) in which the core material (W) is embedded. At this time, the mixture may be heated to a temperature equal to or higher than the melting point of the plastic by the second heating unit 340 . When the mixture is heated in this way, the plastic components in the mixture are dissolved to form a plastic melt, and the slag can be uniformly dispersed in the melt of the molten plastic, such as the filling plastic. In addition, the core material W may be attached to the plastic melt and extruded out of the extruder body 312 together with the mixture through the die 320 by the extruding force of the mixture.

The molding unit 300 may continuously form the molded body E by extruding the mixture. The molded body E thus formed may be cut to have a predetermined length or a desired length by the cutting unit 400 . The cutting portion 400 may be disposed to be spaced apart from the extruder body 312 in front of the extruder body 312 or in front of the die 320 in the direction in which the molded body is discharged.

Hereinafter, a molded article manufacturing method according to an embodiment of the present invention will be described.

Figure 2 is a flow chart showing the process of manufacturing a molded body sequentially by the molded body manufacturing method according to an embodiment of the present invention, Figure 3 is a process of manufacturing a slag-plastic composite sequentially in the molded body manufacturing method according to an embodiment of the present invention , and FIG. 4 is a view conceptually showing a molded article manufactured by the molded article manufacturing method according to an embodiment of the present invention.

Referring to FIG. 2, the molded body manufacturing method according to an embodiment of the present invention includes a process of preparing slag (S110), a process of preparing plastic (S120), and a process of preparing a core material (W) (S130). , a process of manufacturing a slag-plastic composite using slag and plastic (S140) and a process of manufacturing a molded body by extruding the slag-plastic composite and plastic (S150). Here, the process of preparing the slag, the process of preparing the plastic, and the process of preparing the core material are described in order, but these processes are not performed sequentially, and the order is not determined and may be variously changed.

Slag can be prepared to produce a slag-plastic composite. At this time, the slag may include various slags generated in the steelmaking process, and may include CaO at 10% by weight or less. Alternatively, the slag may include 0% to 5% by weight, or 0.01 to 2.0% by weight of CaO. Such slag may include ferronickel slag generated in the process of manufacturing ferronickel molten steel. Alternatively, the slag may include ferronickel slag, blast furnace slag, converter furnace slag, electric furnace slag, etc., or slag whose components are adjusted to contain 10% by weight or less of CaO by mixing the slag with a separate auxiliary material. may be In this case, the smaller the CaO content contained in the slag, the better.

Table 1 below shows the content of the main components according to the type of slag.

blast furnace slag steelmaking slag Furnace slag (oxidation) Furnace slag (reduction) ferronickel slag CaO (wt%) 41.8 46.1 13.85 44.96 0.28 SiO ₂ (wt%) 33.50 41.8 17.57 23.21 54.7 Al ₂ O ₃ (wt%) 13.6 1.5 7.45 12.98 1.93 MgO (wt%) 6.4 6.3 5.15 9.90 33.1 Other (wt%) 4.7 4.3 55.98 8.95 9.99

As shown in Table 1, it can be seen that ferronickel slag has a very small CaO content compared to blast furnace slag, steelmaking slag, and electric furnace slag. Since CaO has a property of absorbing moisture, when a slag-plastic composite is manufactured using blast furnace slag, steelmaking slag, and electric furnace slag containing a large amount of CaO, or a molded body is manufactured, it is absorbed into the slag at a temperature of 100 ° C or higher. Evaporation of moisture occurs. The evaporated moisture causes bubbles in the slag-plastic composite or molded body to lower the strength of the slag-plastic composite or molded body. Therefore, a slag-plastic composite can be prepared by using ferronickel slag alone, which contains less CaO than other slags, and a high-strength molded body can be manufactured using the ferronickel slag. Alternatively, ferronickel slag, blast furnace slag, converter slag, and electric furnace slag may be mixed to contain 10% by weight or less of CaO based on the total weight of the slag, and the components of the slag may be adjusted and then used to manufacture a molded body. Alternatively, after adjusting the components of the slag by mixing a separate auxiliary material with at least one slag of ferronickel slag, blast furnace slag, converter slag, and electric furnace slag to contain 10% by weight or less of CaO with respect to the total weight of the slag. It can also be used to manufacture molded bodies. In other words, the slag used in the compact can be prepared by mixing slags having different contents of CaO with each other. At this time, the CaO content may be adjusted to 10% by weight or less by mixing slag with a high CaO content and slag with a low CaO content. Alternatively, slag having a CaO content of more than 10% by weight and a supplementary material containing a large amount of SiO ₂ may be mixed, and slag having a CaO content adjusted to 10% by weight or less may be used for manufacturing a molded body. For example, 10% by weight of blast furnace slag and 90% by weight of ferronickel slag based on the total weight of the blast furnace slag and ferronickel slag are mixed, and a slag-plastic composite can be manufactured using the mixture. Alternatively, 15% by weight of electric furnace slag (oxidized) and 85% by weight of ferronickel slag are mixed with respect to the total weight of the electric furnace slag (oxidized) and ferronickel slag, and a slag-plastic composite can be prepared using the mixture. can At this time, it is possible to easily adjust the CaO content by mixing electric furnace slag (oxidation) with ferronickel slag, which has a lower CaO content than blast furnace slag or steelmaking slag. In this way, a slag-plastic composite can be manufactured using various slags generated in the steelmaking process, and a molded body can be manufactured by extruding the manufactured slag-plastic composite and plastic. Hereinafter, an example of manufacturing a molded body using ferronickel slag will be described.

Ferronickel slag has a very low content of CaO compared to other slags and has a very high hardness (Mohs hardness) of about 7 to 7.5 Mohs. In addition, as shown in FIG. 4, ferronickel slag is a polyhedral particle with angular angles, and the particle shape is very irregular. When a molded article is manufactured using such ferronickel slag, the contact area between slag particles is increased compared to slag having a spherical particle shape, so that bonding strength between slag particles can be increased. Through this, the density of the ferronickel slag in the molded body is increased, so that a high-strength molded body having excellent mechanical properties can be manufactured. In the embodiment of the present invention, an example of using ferronickel slag as a slag used as a raw material for a molded body will be described, and hereinafter, ferronickel slag will be referred to as slag.

The particle size of the slag can be screened to produce a slag-plastic composite. Slag generated in the process of manufacturing ferronickel molten metal can be crushed. When the slag is crushed, more than 90% of the slag has a particle size of 6 mm or less. Among them, slag having a particle size of about 0.01 to 0.15 mm or 0.05 to 0.1 mm can be selected and used as a raw material for a slag-plastic composite. At this time, the smaller the particle size of the slag, the better. However, if the particle size of the slag is processed to be too small, the cost required to crush the slag may increase. On the other hand, if the particle size of the slag exceeds 0.15 mm, it is difficult to sufficiently secure a contact area between the slag and the plastic, and thus, it is difficult to sufficiently improve the strength of a molded body manufactured using the slag.

Plastics used as raw materials for the molded body, such as coating plastics and filling plastics, may be provided. Plastics are thermoplastics such as polyethylene (PE), polypropylene (PP), polystyrene (PS), and polycarbonate (PC), which melt when heated and change back to a solid state when cooled. can include Here, polyethylene may include high density polyethylene (HDPE) and low density polyethylene (LDPE), and here, high density polyethylene capable of implementing relatively high strength may be used. In this case, the plastic may include waste plastic collected from domestic waste and industrial waste. The collected plastic, for example, waste plastic, is washed to remove impurities, and then crushed to have a size of 5 mm or less, about 1 to 4 mm, or about 2 to 3 mm, and then used as a raw material for a molded body. The size of the plastic may be 5 mm or less in the largest part of the width, length, and thickness. If the size of the plastic is too small, when the plastic is injected into the coating container 112 or the extruder body 312, it may scatter or the difference in weight or specific gravity with the slag may increase, so that it may not be easily mixed with the slag or the slag-plastic composite. . On the other hand, if the size of the plastic is too large, the slag or the slag-plastic composite and the plastic may not be uniformly mixed. In addition, when manufacturing a slag-plastic composite, it is difficult to sufficiently coat the surface of the slag because it is not easily melted and the contact frequency or contact area between the slag and plastic is reduced. Therefore, the plastic can be crushed into an appropriate size so that it can be uniformly mixed with the slag, and the slag can be smoothly coated with the plastic by increasing the contact frequency or contact area with the slag.

In addition, a core material (W) to be inserted into the molded body (E) may be prepared (S130). The core material W may be formed of a material having a melting point higher than that of plastic and having ductility. For example, the core material W may include a metal material such as aluminum, copper, iron, or the like, or may include a fiber such as cotton yarn. When extruding a mixture of a slag-plastic composite and plastic, since the mixture is heated to a temperature higher than the melting point of the plastic, the core material (W) must maintain its shape and characteristics during and after extrusion, so the core material (W) It is preferable to form a material that has a melting point higher than the melting point or is not deformed. In addition, the core material (W) is preferably formed of a material having ductility so that it can be smoothly supplied into the forming unit 300, that is, the screw 330. The core material (W) may be formed to have a thickness thinner than the width or thickness of the molded body (E), for example, about 0.1 to 3 mm. The thickness of the core material (W) may be variously changed according to the size or shape of the molded body (E). The core material W is inserted into the molded body and attached to the plastic constituting the molded body, thereby increasing the strength of the molded body and suppressing or preventing pieces of the molded body from falling apart when the molded body is damaged.

In this way, when raw materials for manufacturing a molded body, for example, slag, plastic, and a core material are provided, a slag-plastic composite can be manufactured using the slag and plastic.

Referring to FIG. 3, the process of manufacturing the slag-plastic composite includes heating the slag (S141), injecting and mixing the plastic into the heated slag (S142), and attaching the plastic to the surface of the slag to A process of preparing a slag-plastic composite (S143) and a process of cooling the slag-plastic composite (S144) may be included. Also, if necessary, a process of crushing the cooled slag-plastic composite (S145) may be performed.

First, the slag may be put into the coating container 112, and the slag may be heated (S141) using the first heating unit 114. While heating the slag, the coating vessel 112 may be rotated to evenly contact the slag with the inner wall of the coating vessel 112 to uniformly heat the slag. At this time, the slag may be heated to a temperature higher than the melting temperature of the plastic and lower than the temperature at which the plastic is burned. The heating temperature of the slag may vary depending on the type of plastic used when preparing the slag-plastic composite, but the slag may be heated to 200° C. or less or 150 to 180° C. If the heating temperature of the slag is too low, the plastic may not melt and may not adhere to the surface of the slag. In this case, there is a problem in that the plastic is attached only to a part of the surface of the slag or the plastic is not attached to the surface of the slag at all, which lowers the manufacturing efficiency of the slag-plastic composite. On the other hand, if the heating temperature of the slag is too high, there is a problem in that the plastic is burned or carbonized, making it impossible to manufacture a slag-plastic composite.

When the slag is heated to a temperature equal to or higher than the melting point of the plastic, the plastic, that is, the coating plastic may be introduced into the coating container 112 and mixed with the slag (S142). The plastic for coating may mean some of the previously prepared plastics. At this time, with respect to the total weight of the slag and the coating plastic, the slag may be added at about 90 to 95% by weight, and the coating plastic at about 5 to 10% by weight. If the input amount of the plastic for coating is too small, the surface of the slag cannot be sufficiently coated. Accordingly, in the process of extruding the slag-plastic composite, the slag directly contacts the inner surface of the extruder body 312 and the screw 330, causing abrasion of the inner surface of the extruder body 312 and the screw 330. On the other hand, if the input amount of the coating plastic is too large, the coating plastic may remain as a lump after manufacturing the slag-plastic composite or the slag-plastic composite may be entangled with each other. In this case, since the slag-plastic composite is not uniformly dispersed in the molded article during manufacture of the molded article, a separate crushing process must be performed (S145) to form the slag-plastic composite into particles, which complicates the process.

When the plastic for coating is put into the coating container 112 as described above, the heated slag and the plastic for coating may be brought into contact with each other by rotating the coating container 112 . Accordingly, the plastic for coating is melted by the heat of the heated slag and attached to the surface of the slag, thereby manufacturing a slag-plastic composite (S143). That is, as shown in FIG. 1 , a slag-plastic composite in which a plastic coating layer (C) is formed on the surface of slag (S) can be manufactured.

When the slag-plastic composite is manufactured, the high-temperature slag-plastic composite may be put into the cooling container 122 to be cooled (S144). At this time, when the cooling container 122 is rotated, the high-temperature slag-plastic composite can be uniformly cooled while contacting the inner surface of the cooling container 122 cooled by the cooling means 124 . In addition, since the slag-plastic composites collide with each other as the cooling container 122 rotates, the slag-plastic composites attached to each other may be broken and the slag-plastic composites may be formed into particles.

Thereafter, a molded body may be manufactured by extruding the cooled slag-plastic composite, plastic, that is, plastic for filling, and the core material W (S150).

In order to manufacture the molded body, the slag-plastic composite, which is a raw material of the molded body, and the plastic for filling may be prepared in a predetermined amount. In this case, the plastic for filling may mean some of the plastics prepared in the process of preparing the plastics previously. 30 to 80% by weight of the slag-plastic composite and 20 to 70% by weight of the plastic for filling can be prepared with respect to the total weight of the slag-plastic composite and the plastic for filling. Alternatively, 40 to 60% by weight of the slag-plastic composite and 40 to 60% by weight of the plastic for filling may be prepared based on the total weight of the slag-plastic composite and the plastic for filling. In this case, based on the total weight of the slag-plastic composite and the plastic for filling, 27 to 76% by weight of the slag and 14 to 73% by weight of the plastic for filling may be included. If the content of slag is too small, the content of plastic for filling, which has a lower strength than that of slag, is relatively increased, and mechanical strength of a molded body manufactured using the same cannot be sufficiently secured. On the other hand, if the content of the slag is too large, the content of the filling plastic for bonding the slag is relatively reduced, and thus the bonding strength between the slags may be deteriorated. For this reason, it is not possible to sufficiently secure the mechanical strength of the molded body. The content of the slag-plastic composite and the filling plastic may vary depending on the purpose of the molded body to be manufactured. For example, when the molded body is used for a purpose requiring high impact strength, the content of the plastic for filling may be adjusted higher than the content of the slag-plastic composite. On the other hand, when the molded article is used for applications requiring high flexural strength, the content of the slag-plastic composite can be adjusted higher than that of the filling plastic. In addition, in addition to the slag-plastic composite and the filling plastic, additives such as a colorant, an ultraviolet stabilizer, and a solubilizing agent may be additionally used according to the purpose of the molded body. For example, when color is imparted to the molded body for aesthetics, a colorant may be further used, and when the molded body is used in a part exposed to sunlight, a UV stabilizer may be further used. In addition, a compatibilizer may be further used to mix waste plastics having different physical properties, that is, to mix them uniformly when manufacturing a molded article. These additives may be used in an amount of 0.01 to 0.05 parts by weight when the total of the slag-plastic composite and the filling plastic is 1. If the content of the additive is too small, the effect of the additive cannot be sufficiently exhibited. On the other hand, if the content of the additive is excessively large, the cost due to the use of the additive increases, and the content of the additive in the molded body increases, which may decrease the strength of the molded body.

On the other hand, the specific gravity of slag is about 2 to 3, and the specific gravity of plastic, such as plastic for coating or plastic for filling, is about 0.8 to 0.95. In addition, a molded article manufactured using slag and plastic may have a specific gravity smaller than that of slag and greater than that of plastic, for example, about 1 to 2. Therefore, the mixing ratio of slag and plastic can be appropriately adjusted according to the use of the molded body. For example, when the molded body is used as a wet flooring material, the effect of buoyancy due to rain can be reduced by increasing the specific gravity of the molded body by increasing the content of slag.

When the raw materials for the molded body are prepared in this way, the prepared raw materials, that is, the slag-plastic composite, filling plastic and core material or the slag-plastic composite, filling plastic, core material and additives may be supplied to the extruder body 312 . At this time, the slag-plastic composite and plastic for filling or the slag-plastic composite, plastic for filling and additives are mixed in a separate mixing container before being supplied or injected into the extruder body 312, and the mixture is mixed in the extruder body 312. It may be supplied to, and each raw material may be supplied independently to the extruder body 312.

In addition, the core material W may be supplied to the inside of the extruder body 312, that is, to the inside of the screw 330 using the core material supply unit 500. At this time, the core material W may be inserted into the through-hole 334 formed inside the screw 330 from the rear in the direction in which the mixture is extruded. The core material (W) may be supplied to be exposed to the outside of the die 320 through the through hole 334 of the screw 330 before supplying the mixture to the extruder body 312 . When the core material W is inserted into the through-hole 334 penetrating the inside of the screw 330, even if the screw 330 rotates, the core material W may maintain a supplied state without rotating. If the core material W is rotated, problems such as twisting or breaking the core material W and generating air bubbles in the mixture may occur.

The mixture supplied to the extruder body 312 is heated by the second heating means 340, and plastics in the mixture may be melted. Then, as the mixture is extruded toward the die 320 by rotation of the screw 330, it comes into contact with the core material W disposed between the end of the screw 330 and the die 320, and the core material W is made of plastic. It can be attached to the melt of and extruded out of the die 320 together with the mixture.

Alternatively, the core material W may be supplied into the through-hole 334 at the same time as supplying the mixture to the extruder body 312 or after supplying the mixture to the extruder body 312 . In this case, the core material W may be inserted into at least a space between the through hole 334 and the die 320 through the core material supply unit W. In addition, when the mixture is supplied to the extruder body 312 and the mixture is heated using the second heating unit 340, the plastic in the mixture may be melted. Then, as the mixture is extruded toward the die 320 by rotation of the screw 330, it comes into contact with the core material W disposed between the end of the screw 330 and the die 320, and the core material W is made of plastic. It may be attached to the melt of and extruded out of the die 320 together with the mixture to produce a molded body (E). At this time, the screw 330 is installed inside the extruder body 312, and since its position does not fluctuate, the disposition position of the core material W inside the molded body can be kept constant.

While extruding the mixture and the core material W in this way, the supply speed of the core material W may be adjusted by using the driving means of the core material supply unit 500 .

When a raw material or mixture is injected into the extruder body 312, a molded body may be manufactured by extruding the raw material by operating the screw 330. At this time, the screw 330 may be operated even before the raw material is injected into the extruder body 312, or may be operated simultaneously with the raw material being injected into the extruder body 312. In addition, the core material W may be supplied into the through hole 334 before the screw 330 is rotated, or may be supplied into the through hole 334 while the screw 330 is rotating.

When injecting the raw material into the extruder body 312, the slag of the raw material is coated with plastic for coating in advance and injected, thereby preventing the slag from directly contacting the inner surface of the extruder body 312 and the screw 330 during extrusion of the raw material. can That is, slag, for example, ferronickel slag, is a material with very high hardness, and when directly contacted with the extruder body 312 and the screw 330, there is a problem of wearing the extruder body 312 and the screw 330. Therefore, when the surface of the slag is coated with coating plastic and injected into the extruder body 312 in the form of a slag-plastic composite, it is possible to suppress or prevent the slag from abrading the extruder body 312 and the screw 330. Accordingly, the durability of the extruder body 312 and the screw 330 may be improved to extend their maintenance or replacement period. In addition, when the surface of the slag is coated or covered with a plastic for coating and extruded together with the plastic for filling, the plastic for coating and the plastic for filling are easily bonded to each other while being melted. Accordingly, the bonding strength between the slag and the plastic can be further improved. In addition, by reducing the difference in specific gravity between the slag and the filling plastic, it is possible to suppress the phenomenon in which the slag and the filling plastic are separated during extrusion, and the slag can be uniformly dispersed in the filling plastic.

The slag-plastic composite and plastic for filling are continuously supplied to the extruder body 312, and the core material W is extruded through the die 320 while continuously supplying the core material W to the through-hole 334, so that the core material W is embedded. molded bodies can be continuously produced. The slag-plastic composite and the filling plastic move toward the die 320 while being sufficiently mixed inside the extruder body 312 . In addition, the slag-plastic composite and the filling plastic are heated by the second heating means 340, so that the plastic components can be melted. Accordingly, the core material W is attached to the plastic melt and can move in a direction in which the mixture of the melt plastic material and the slag or the mixture of the melt plastic material and the slag-plastic composite is extruded.

In the process of manufacturing the molded body as described above, the internal temperature of the extruder body 312 may be adjusted. In the extruder body 312, the side of the inlet 314 into which the slag-plastic composite and the filling plastic are injected is heated to about 170 to 190 ° C, and the side where the slag-plastic composite, the filling plastic and the core material W are extruded is heated. It can be heated to about 200 to 230°C. This is because the plastic for coating is easily melted in the slag-plastic composite when the temperature on the side of the inlet 314 is too high. If the plastic for coating is easily or quickly melted in this way, the slag is exposed and comes into direct contact with the extruder body 312 and the screw 330, which can cause the extruder body 312 and the screw 330 to be worn. Therefore, by increasing the temperature of the extruder body 312 along the moving direction of the raw material to delay melting of the coating plastic, it is possible to prevent slag from abrading the extruder body 312 and the screw 330 .

When the molded body having the core material W is extruded through the die 320, the molded body is cooled and then cut into a predetermined length or a target length using the cutting unit 400 to manufacture a product of a desired size. have. At this time, the shape of the molded article or product may be variously changed according to the inner shape of the die 320 . In this way, it is possible to mass-manufacture molded bodies using slag and plastic. 4 is a view conceptually showing a molded body manufactured by a molded body manufacturing method according to an embodiment of the present invention. The molded body (E) is formed to have a certain length or a target length through the cutting portion 400, and a core material (W) may be embedded therein. The core material (W) may be disposed to cross the inside of the molded body (E), and the plastic may be closely bonded to the surface of the core material (W). Here, although it is shown that one core material (W) is formed inside the molded body (E), the core material (W) may be formed in plurality inside the molded body (E). In addition, since the molded body (E) is continuously manufactured and then cut to a certain length, the core material (W) may be continuously formed inside the molded body (E) and may be formed to be exposed to the outside of the molded body (E). .

When the molded article is manufactured in this way, it is possible to prevent the extruder body 312 and the screw 330 from being worn by the slag, thereby improving durability and service life of the extruder body 312 and the screw 330. In addition, since the core material (W) is not exposed between the inner surface of the extruder body 312 and the outer surface of the screw 330, the core material (W) is broken by the rotation of the screw 330 or the screw 330 ) can be prevented from occurring.

In addition, by using waste slag and waste plastic to produce high value-added products such as building materials and civil engineering materials, environmental pollution caused by wastes can be reduced and construction costs can be reduced. In addition, since the core material W is disposed inside the molded body, the molded body can have higher strength. In particular, since the plastic constituting the molded body is firmly attached or bonded to the core material W, even if an impact is applied to the molded body, it is possible to prevent the molded body from being easily broken or broken.

Although the present invention has been described with reference to the accompanying drawings and preferred embodiments described above, the present invention is not limited thereto, and is limited by the claims described below. Therefore, those skilled in the art can variously modify and modify the present invention within the scope not departing from the technical spirit of the claims to be described later.

100: coating unit 110: coating machine
120: cooler 300: molding unit
312: extruder body 320: die
330: screw 340: second heating means
400: cutting unit 500: core supply unit
E: molded body W: core material

Claims (21)

the process of preparing slag;
The process of preparing plastic;
process of preparing heartwood;
attaching the plastic to at least a portion of the slag to prepare a slag-plastic composite;
Extruding a mixture of the slag-plastic composite and plastic at a temperature equal to or higher than the melting temperature of the plastic, and supplying the core material to the mixture to manufacture a molded body having the core material embedded therein,
The process of manufacturing the molded body,
A molded body manufacturing method comprising the step of contacting the core material with the melt of the mixture. The method of claim 1,
The process of preparing the slag includes a component adjustment process of adjusting the CaO content of the slag. According to claim 1 or 2,
The process of preparing the plastic,
The process of collecting waste plastic; and
A method for manufacturing a molded body comprising crushing the waste plastic. According to claim 1 or 2,
The process of preparing the core material,
A method for manufacturing a molded body comprising the step of preparing a core material containing a material having a higher melting point than the plastic. According to claim 1 or 2,
The process of manufacturing the slag-plastic composite,
heating the slag to have a temperature equal to or higher than the melting point of the plastic;
Injecting the plastic into the heated slag; and
Method for manufacturing a molded body comprising a; process of attaching plastic to the surface of the heated slag. The method of claim 5,
The process of injecting the plastic into the heated slag,
A method for manufacturing a molded body comprising the step of adding 5 to 10% by weight of plastic with respect to the total sum of the heated slag and the plastic. The method of claim 5,
The process of manufacturing the slag-plastic composite,
maintaining the temperature of the heated slag at a temperature equal to or higher than the melting point of the plastic;
stirring the heated slag and the plastic to bring the plastic into contact with the heated slag, and melting the plastic using the heat of the heated slag; and
A method for manufacturing a molded body comprising a step of attaching molten plastic to the surface of the heated slag. According to claim 1 or 2,
The process of manufacturing the molded body,
and preparing a slag-plastic composite of 30 to 80% by weight based on the total sum of the slag-plastic composite and the plastic. delete According to claim 1 or 2,
The process of supplying the core material,
supplying the core material to the mixture from the rear in the extrusion direction of the mixture; and
and automatically supplying the core material into the mixture by using the extruding force of the mixture. The method of claim 10,
The process of supplying the core material includes supplying a plurality of core materials to be disposed spaced apart from each other inside the mixture. The method of claim 1,
The process of preparing the slag includes a process of preparing ferronickel slag generated in the process of manufacturing ferronickel molten steel. a coating unit capable of producing a slag-plastic composite by attaching a melted material of plastic to the surface of the slag;
a molding unit for producing a molded body by melting and extruding a mixture of the slag-plastic composite and plastic; and
Molded body manufacturing equipment comprising a; core material supply unit for supplying a core material from the outside of the molding unit to the inside of the molding unit so as to be extruded together with the melt of the mixture. The method of claim 13,
The coating part,
A coating container that is rotatable and forms a space capable of accommodating the slag therein; and
Molded body manufacturing equipment comprising a; first heating means formed in the coating vessel to heat the slag. The method of claim 13,
Molded body manufacturing equipment including a screw in which a through hole penetrating the inside of the molding unit is formed. The method of claim 15
The core material supply unit is installed behind the molding unit to supply the core material to the through hole. delete delete delete delete delete

Images