KR101187280B1 - Artificial aggregate using coal ash and method and apparatus for manufacturing thereof - Google Patents

Abstract

The present invention relates to an artificial aggregate using coal ash and a method and apparatus for producing the artificial aggregate. The apparatus for producing artificial aggregate using coal ash according to the present invention is a hollow cylindrical shape having both ends open to the hollow. A sintering furnace for receiving and sintering raw materials including 90 to 97 parts by weight of coal ash, 2 to 10 parts by weight of binder, and 0 to 1 parts by weight of additives in the inner space formed by the ignition unit, and an ignition unit disposed at one end of the sintering furnace. And an exhaust fan disposed at the other end of the sintering furnace for forcibly discharging air in the internal space of the sintering furnace to the outside.

Coal ash, fly ash, bottom ash, artificial aggregate, lightweight aggregate, sintered, calcined.

Description

Artificial aggregate using coal ash, and manufacturing method and apparatus therefor {ARTIFICIAL AGGREGATE USING COAL ASH AND METHOD AND APPARATUS FOR MANUFACTURING THEREOF}

The present invention relates to an artificial aggregate, and more particularly, to an artificial aggregate using coal ash and a method and apparatus for producing the artificial aggregate.

After burning coal, coal ash remains as a byproduct. Coal ash includes bottom ash (low ash) that remains on the floor or furnace wall by combustion, and fly ash (fly ash) that is collected in the year when burning pulverized coal. It is known to contain a small amount and may cause soil pollution and water pollution if discarded without any action. However, coal ash contains a metal component such as iron oxide, so it has high strength and light weight, so it is also excellent in its utility as a cement admixture or concrete admixture.

Each coal material is weighed and blended using these coal materials as a main raw material, and then formed into a block (hereinafter, the block of bulk material is referred to as a 'coal material raw material ball'). Through treatment, hard aggregates can be obtained. This is a kind of aggregates obtained through artificial treatment, which is called artificial aggregates in comparison with natural aggregates such as gravel or sand, and is also called artificial lightweight aggregates because it is lighter than natural aggregates.

Artificial light aggregate using coal ash is generally spherical, rough and hard, and has very strong durability in terms of dynamic resistance, water absorption, stability, softening coefficient, etc. As well as concrete made using artificial light aggregate of coal ash, natural aggregate is used. The strength is higher than the concrete produced. Therefore, in advanced countries, artificial coal light coal is widely applied to high strength and light weight concrete for various purposes. For example, coal-based artificial light aggregate can be used to make plain concrete as well as prestressed concrete, depending on construction methods such as precast, site casting, climbing form, and mechanical molding. It can be used in the form of new construction materials with higher strength and lighter weight than existing building materials such as insulation protection, structural members, hollow blocks, porous blocks, sidewalk blocks, standard blocks, and thermal insulation wall boards.

As such, artificial coal light coal has become a priority area of construction industry because of its high utilization. However, the combustion process for obtaining coal ash or the sintering of coal ash raw material is inevitable, and the generation of large amount of exhaust gas and dust is inevitable, and the coal ash obtained in the flow roasting process forms the internal aggregate of coal ash raw material which will form artificial aggregate. There is a problem that the demand for strength is high and the utilization efficiency of coal ash is limited. In addition, the equipment for obtaining artificial aggregate by sintering coal ash raw materials has to carry out many manufacturing processes, which is complicated, and the production cost is high, which impairs practicality.

On the other hand, not all coal ash can be made of artificial aggregate, because the facilities of each coal-fired power plant that can obtain a large amount of coal ash is not the same, so the components of the coal ash obtained are also different. For example, some coal-fired coal ash contains 0.02% carbon while some coal-fired coal ash contains 18% carbon. In these two cases, it is difficult to sinter the coal ash into artificial aggregate, and thus it is also a problem to secure coal ash having an appropriate carbon content.

In order to solve the problems as described above, an object of the present invention is to provide an artificial aggregate using coal ash that is suitable for the production of artificial aggregate by the sintering process, which can have the maximum light weight and high strength.

Another object of the present invention is to provide an apparatus and method for producing artificial aggregate using coal ash, which can efficiently sinter artificial aggregates using coal ash to increase production yield and reduce the emission of pollutants.

Other objects, specific advantages and novel features of the invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings.

Artificial aggregate using the coal ash according to the present invention in order to achieve the above object, it comprises 90 to 97 parts by weight of coal ash, 2 to 10 parts by weight of binder, 0 to 1 parts by weight of additives. At this time, the chemical composition of the mixture consisting of coal ash and additives is SiO ₂ 45-60 parts by weight, Al ₂ O ₃ 20-35 parts by weight, Fe ₂ O ₃ 7-10 parts by weight, CaO 0-4 parts by weight, K ₂ O 0.1 to 0.3 parts by weight, Na ₂ O 0.1 to 0.3 parts by weight, MgO 0 ~ 0.2 parts by weight, preferably Mrs. C 5 ~ 8 wt. In addition, the plasticity index of the binder is preferably greater than 14. And the binder is preferably at least one selected from the group consisting of clay, water glass and pulp sludge. On the other hand, the additives preferably include at least one selected from the group consisting of salt, hematite, water glass and basalt.

Apparatus for producing artificial aggregate using coal ash according to the present invention is a hollow cylindrical shape with both ends open, 90 to 97 parts by weight of coal ash, 2 to 10 parts by weight of binder, 0 ~ additives in the inner space formed by the hollow A sintering furnace for accommodating and sintering raw materials including 1 part by weight, an ignition unit disposed at one end of the sintering furnace, and disposed at the other end of the sintering furnace to force air in the internal space of the sintering furnace to the outside And an exhaust fan for discharging.

In the apparatus for producing artificial aggregate using coal ash according to the present invention, the sintering furnace is preferably disposed so that one end is located at a point higher than the other end. In this case, the ignition unit preferably includes a heat-resistant cart in the shape of a container containing fuel and having a plurality of through-holes in the bottom thereof, wherein the bottom surfaces of the heat-resistant cart are formed by a plurality of great bars arranged to be spaced apart from each other. Can be. In addition, the guide rail is fixed to the outside, the bearing is installed on the lower portion of the heat-resistant cart, it is more preferably installed rotatably by the bearing and moving wheels moving along the guide rail. A linear actuator may be additionally installed between the heat-resistant cart and the bearing. That is, the heat-resistant cart is operated to be spaced apart from or close to one end of the sintering furnace.

In addition, the apparatus for producing artificial aggregate using coal ash according to the present invention further comprises an exhaust duct disposed so that one end is in communication with the inner space of the sintering furnace through the other end of the sintering furnace, and the exhaust fan is the exhaust fan. It is preferably connected to the other end of the duct. In addition, the apparatus for producing artificial aggregate using coal ash according to the present invention preferably further includes a discharge pipe installed to communicate with the inner space of the sintering furnace through the other end of the sintering furnace, and a discharge valve for opening and closing the discharge pipe. . At this time, the discharge valve is a disk having a diameter greater than or equal to the outer diameter of the discharge pipe is rotated about the axis parallel to the tube axis (pipe) of the discharge pipe is formed through the discharge hole having a diameter less than the inner diameter of the discharge pipe through the discharge hole It is preferable that the excluded plate surface includes a rotary valve plate arranged to close the other end of the discharge pipe.

In addition, the apparatus for producing artificial aggregate using coal ash according to the present invention preferably further includes a pulverized plate rotatably installed with the center of rotation of the hollow central axis of the sintering furnace above one end of the exhaust duct. At this time, the crush plate is preferably a horn shape is formed with a projection on the horn surface.

In addition, the apparatus for producing artificial aggregate using coal ash according to the present invention includes a ring-shaped discharge guide tube installed between the other end of the sintering furnace and one end of the discharge pipe, and is installed at the lower end of the pulverizing plate and the discharge guide tube. Further comprising a discharge guide plate to rotate along, one end of the discharge pipe is preferably installed to communicate with the discharge guide tube.

On the other hand, the apparatus for producing artificial aggregate using coal ash according to the present invention, the sintering furnace may be characterized in that the one end is disposed so as to be located at a point lower than the other end. In this case, it is preferable that the apparatus for producing artificial aggregate using coal ash according to the present invention further includes a plurality of great bars disposed spaced apart from each other at one end of the sintering furnace. The apparatus may further include an exhaust duct disposed to cover the other end of the sintering furnace and provided with an openable and open door, wherein the exhaust fan is connected to the exhaust duct.

Apparatus for producing artificial aggregate using coal ash according to the present invention is a hollow cylindrical shape, each end of which is open, and 90 to 97 parts by weight of coal ash, 2 to 10 parts by weight of binder in the internal space formed by the hollow, additive 0 A plurality of sintering furnaces arranged to be spaced apart from each other for receiving and sintering a raw material including ˜1 parts by weight, guide rails fixed to pass above each of the plurality of sintering furnaces, and containing fuel and having a plurality on the bottom surface And a heat-resistant cart moving along the guide rail, and an exhaust fan disposed at the other end of each sintering furnace for forcibly discharging air in the internal space of the sintering furnace to the outside. Can be achieved.

The method for producing artificial aggregate using coal ash according to the present invention includes a blending step of blending a raw material consisting of 90 to 97 parts by weight of coal ash, 2 to 10 parts by weight of binder, and 0 to 1 part by weight of additives, and the blended raw materials at both ends. Input to the hollow tubular sintering furnace with an opening, an ignition step to ignite the raw material at one end of the sintering furnace, and exhaust to force air from the sintering furnace at the other end of the sintering furnace. And a grinding step of pulverizing the artificial aggregate produced by sintering the raw material. It is preferable to further include a molding step of forming the raw material into a mass before the feeding step.

In addition, in the manufacturing method of artificial aggregate using coal ash according to the present invention, one end of the sintering furnace is preferably disposed higher than the other end.

According to the present invention, since the raw material pellets are sintered in a fixed manner, dust is suppressed, and since the raw materials are sintered evenly because the raw materials are sintered in a good sealing state, the yield of the finished product can be increased to 95% or more. In addition, since the sintered by self burning by the carbon remaining in the coal ash material sintering, if only the ignition can be sintered, energy can be saved as much as the fuel supply is not necessary for the sintering process, and the production cost is naturally reduced. In addition, since the coal ash raw material sphere is accommodated in the sintering furnace, it is possible to obtain the effect of filtering the dust generated in the combustion process due to the gap therebetween. Therefore, the emission of pollutants can be minimized. On the other hand, coal ash raw material has a coal ash content of 90%, it can maximize the throughput of coal ash.

In addition to the above objects, features and advantages, the present invention has other objects, features and advantages, and the other objects, features and effects of the present invention will be described in detail below with reference to the accompanying drawings.

Hereinafter, a preferred embodiment of artificial aggregate using coal ash according to the present invention will be described in detail. In the present specification, the weight part indicated as a range of numerical values generally means a range each including an upper limit and a lower limit, that is, a lower limit or more and an upper limit or less, and a range exceeding zero only when the lower limit is zero.

The artificial aggregate using the coal ash according to the present invention is preferably made of 90 parts or more of coal ash, 10 parts or less of binder, and 1 part or less of additives. In addition, the artificial aggregate using the coal ash according to the present invention in terms of the chemical composition of the mixture consisting of coal ash and additives, 45 to 60 parts SiO ₂ , 20 to 35 parts Al ₂ O ₃ , 10 parts or less Fe ₂ O ₃ , CaO is less than 4 parts, K ₂ O 0.1 part or more, Na ₂ O 0.1 part or more, MgO 2 parts or less, C 5 ~ 8 wife is preferred.

Among them, CaO and MgO are harmful substances, so the smaller the content, the better. K ₂ O, Na ₂ O is a beneficial substance, the higher the content, the better.

The more preferable component ratio of the artificial aggregate using the coal ash which concerns on this invention is 90-97 parts of coal ash, 2-10 parts of binders, and 0-1 part of additives as a weight part. In addition, the chemical composition of the mixture consisting of coal ash and additives is by weight parts SiO ₂ 45-60 parts, Al ₂ O ₃ 20-35 parts, Fe ₂ O ₃ 7-10 parts, CaO 0-4 parts, K ₂ O 0.1 0.3 parts, Na ₂ O 0.1-0.3 parts, MgO 0-2 parts, C 5-8 parts. On the other hand, the plasticity index of the binder is 14 or more, and no limitation on chemical composition is necessary.

The binder may be clay, water glass, pulp sludge or the like.

As the additive, salt NaCl, hematite Fe ₂ O ₃ , water glass Na ₂ O? SiO ₂ and basalt can be used. Here, salt is supplemented with Na ion content, hematite is supplemented with iron content, water glass controls the plasticity index of clay, and basalt adjusts the expansion index of coal ash artificial aggregate.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the apparatus for producing artificial aggregate using coal ash according to the present invention.

1 is a cross-sectional view schematically showing an embodiment of an apparatus for producing artificial aggregate using coal ash according to the present invention, FIG. 2 is an enlarged cross-sectional view of an upper portion of the embodiment of FIG. 1, and FIG. 3 is an embodiment of FIG. 1. 4 is an enlarged cross-sectional view of the lower part of the embodiment of FIG. 1, and FIG. 5 is an enlarged cross-sectional view of the discharge pipe and the discharge valve of the embodiment of FIG. 1.

An embodiment of the present manufacturing apparatus is for sintering artificial aggregate using coal ash described above, and accommodates the coal ash raw material 50 having a blending component as described for the artificial aggregate using the coal ash in the sintering furnace 100. .

The sintering furnace 100 has a hollow cylindrical shape, and both ends 100a and 100b are open. The open both ends 100a and 100b of the sintering furnace 100 are arranged to have a height difference from each other. In FIG. 1, in particular, the sintering furnace 100 is disposed such that both ends are positioned on one vertical line. That is, the sintering furnace 100 is disposed perpendicular to the ground.

Since the size of the sintering furnace 100 determines the amount of coal ash raw material 50 that can be sintered at once, a large one is preferable for improving the processing speed, but the sintering speed and coal ash raw material 50 are introduced and discharged. Appropriate level according to the time required for the process, the compressive strength of the coal ash raw material 50 accommodated in the sintering furnace 100, the structural strength of the sintering furnace 100 that can accommodate and support the coal ash raw material 50 It needs to be determined at. In the arrangement as shown in FIG. 1, the specific size of the sintering furnace 100 is preferably a cylindrical shape having an outer diameter of 1000 to 3000 mm, an inner diameter of 800 to 2800 mm, and a height of 100 to 3000 mm. More preferably, the sintering furnace 100 has a cylindrical shape having an outer diameter of 1500 mm, an inner diameter of 1300 mm, and a height of 2000 mm. At this time, it is obvious that the inner surface of the sintering furnace 100 should be made of a refractory material, and by combining a steel plate having a thickness of 6 mm to the outer surface, structural rigidity can be maintained.

The shape and structure of the sintering furnace 100 described above are merely illustrative, and are not intended to be limiting, and one of ordinary skill in the art to which the present invention pertains may readily derive in the context of the present invention. The shape of the sintering furnace 100 may be a conical shape, an inverted cone shape, or the like, and the sintering furnace 100 may be installed vertically or inclined so that both ends thereof are on a vertical line. In addition, by installing a sensor in the sintering furnace 100, it is possible to determine the degree of sintering progress or failure by detecting the temperature change of the internal space, that is, the furnace chamber (furnace chamber).

The ignition unit 200 is disposed at one end portion 100a positioned above the sintering furnace 100 in a state in which the sintering furnace 100 is vertically disposed. The ignition unit 200 is for igniting the coal ash raw material 50 accommodated in the sintering furnace 100, as shown in Figure 2 comprises a heat-resistant cart 210 for receiving the ignition fuel 205. . Coke is suitable as the ignition fuel 205. A plurality of through-holes are formed in the bottom surface of the heat-resistant cart 210, and when the coke contained in the heat-resistant cart 210 is burned, its heat of combustion or flame is burned. It is possible to penetrate below the bottom surface of 210. The use of coke as the ignition fuel 205 only takes into account the cost factors of the production of artificial coal aggregate, and other means may be used. For example, LPG, oil, etc. can be used as a raw material for ignition.

On the other hand, in order to form a plurality of through holes in the bottom surface of the heat-resistant cart 210, by placing the plurality of great bars 211 to be spaced apart from each other can form the bottom surface of the heat-resistant cart 210. Then, the spaced spaces between the great bars 211 function as the through holes. At this time, the great bar 211 is a hollow rectangular pipe shape, as shown in Figure 3, the material is recrystallized silicon carbide, the heat resistance temperature is 1600 ℃ or more and can run continuously for more than one year under the sintering temperature of 1600 ℃ have. The cross section of each of the great bars 211 is rectangular, with an optimal width of 50 mm, an optimal height of 60 mm, and an optimal wall thickness of 6 mm. The shape of each hollow fiber cross section allows the great bars 211 to have high strength and light weight. This saves material and lowers manufacturing costs as much as possible. Each of the great bars 211 are spaced apart from each other at intervals of 40 mm to allow the flame to smoothly pass through the gaps between the great bars 211.

Heat-resistant cart 210 is preferably arranged to be movable. That is, the ignition guide rail 220 is fixed to the outside, and the heat-resistant cart 210 moves along the ignition guide rail 220. To this end, the bearing 203 is installed at the lower portion of the heat-resistant cart 210, and the moving wheel 240 is rotatably installed in the bearing 230. Here, the bearing 230 may be any shape as long as the bearing 230 can rotatably support the moving wheel 240 regardless of a sliding bearing, a rolling bearing, or a simple bore or bush. When the heat-resistant cart 210 is disposed in this manner, the sintering furnace 100 is approached to ignite the coal ash raw material 50 accommodated in the sintering furnace 100 and then ignited by leaving the sintering furnace 100. It is possible to prevent unnecessary waste of the fuel 205 and to smoothly introduce air into the sintering furnace 100. Furthermore, it becomes possible to equip the facility which ignites all the sintering furnaces 100 only by the heat-resistant cart 210 of fewer than the number of the sintering furnaces 100 in the state provided with the some sintering furnace 100. Such equipment will be described later with reference to FIG. 9. Heat-resistant cart 210 is also preferably installed to be spaced apart or accessible to the sintering furnace (100). When igniting the coal ash raw material 50 of the sintering furnace 100, the lower end of the heat-resistant cart 210 is in close contact with the upper end of the sintering furnace 100 to facilitate the ignition, the heat-resistant cart 210 at this time The sintering furnace 100 must be approached. The seal ring 110 provided at the upper end of the sintering furnace 100 seals the maximum between the lower end of the heat-resistant cart 210 and the upper end of the sintering furnace 100 to heat or flame from the heat-resistant cart 210. To provide to the sintering furnace 100 without loss. On the contrary, in order to completely separate the heat-resistant cart 210 from the sintering furnace 100 along the ignition guide rail 220, it must first be spaced apart from the sintering furnace 100. Therefore, the linear actuator 250 is disposed between the heat-resistant cart 210 and the bearing 230 so that the heat-resistant cart 210 can be operated in the vertical direction.

The exhaust fan 300 is connected to the other end (100b) located at the lower end of the sintering furnace 100 to forcibly discharge to the outside as air in the internal space of the sintering furnace (100). Therefore, air flow is formed in the internal space of the sintering furnace 100 from the upper end portion 100a toward the lower end portion 100b, and the coal ash raw material 50 received in the sintering furnace 100 is burned in the direction from the upper layer to the lower layer. And sintered. In order to increase the exhaust efficiency of the exhaust fan 300, one end of the exhaust duct 310 is installed at the lower end of the sintering furnace 100 so as to communicate with the internal space of the sintering furnace 100, and the exhaust end of the exhaust duct 310 It is preferable to connect the exhaust fan 300 to the other end. A dust collector may be additionally installed at the front and rear ends of the exhaust fan 300.

The discharge pipe 400 is additionally installed at the other end portion 100b of the sintering furnace 100. The discharge pipe 400 is a passage for discharging the sintered coal ash raw material 50, that is, the sintered coal ash to the outside, depending on the design so that a part of the exhaust duct 310 and the discharge pipe 400 is formed as a single tube body It is also possible, but as illustrated in FIG. 4, the discharge pipe 400 is installed separately from the exhaust duct 310 to help smoothly discharge the sintered coal ash. If the discharge pipe 400 is normally opened, the air flow by the exhaust fan 300 may be disturbed and the sintered coal ash may leak, and thus, the discharge valve 410 may be provided to selectively open and close the discharge pipe 400. The discharge valve 410 may be implemented in various forms, but preferably comprises a rotary valve plate 410. The rotary valve plate 410 has a disc shape having a diameter greater than or equal to the diameter of the discharge pipe 400, and is formed through a discharge hole 410a having a diameter less than or equal to the inner diameter of the discharge pipe 400 on the plate surface. It is installed to be rotatable about an axis parallel to the tube axis of the tube. In Figure 5, the rotary shaft of the rotary valve plate 410 is disposed outside the discharge pipe 400, the radius of the rotary valve plate 410 is illustrated as being larger than the diameter of the discharge pipe 400, in this state the rotary valve When the plate 410 is rotated by the motor 420, the discharge pipe 400 is opened when the discharge hole 410a is located in the discharge pipe 400, and the discharge hole 410a is located outside the discharge pipe 400. When the plate surface of the rotary valve plate 410 blocks the end of the discharge pipe (400). The discharge extension pipe 430 is connected to the rear end of the rotary valve plate 410 to guide additional movement of the sintered coal ash passing through the discharge hole 410a of the rotary valve plate 410.

Since the coal ash raw material 50 may be attached to each other during the combustion and sintering process, it is preferable to further include a crushing plate 500 to eliminate the adhesion therebetween. The pulverization plate 500 is installed to be rotatable coaxially with the hollow central axis forming the inner space of the sintering furnace 100. The installation position of the crushing plate 500 is the other end portion 100b of the lower end of the sintering furnace 100, and is preferably disposed at a position higher than one end of the exhaust duct 310. When the crushing plate 500 rotates, the sintered coal ash raw material 50, that is, friction with the sintered coal ash is generated, so that the sintered coal ashes that are attached to each other are separated. In order to increase this friction effect and smooth the separated sintered coal ash is moved downward and finally discharged through the discharge pipe 400, the crushing plate 500 is a horn shape, the projection 505 is formed on the horn surface It is preferable. Considering that the grinding plate 500 is rotationally driven, it is preferable to have a conical shape among the horn shapes, but the shape may be modified as necessary. On the other hand, a plurality of through holes may be formed in the pulverizing plate 500 to facilitate the exhaust action by the exhaust fan 300.

In order to smoothly discharge the sintered coal ash, the lower end portion 100b of the sintering furnace 100 is additionally provided with a ring-shaped discharge guide tube 440, and the discharge pipe 400 is in communication with the discharge guide tube 440. It is desirable to. That is, as shown in Figure 4, the discharge guide tube 440 is disposed along the inner circumference of the other end (100b) of the sintering furnace 100 under the grinding plate 500, one end of the discharge pipe 400 The addition is in communication with the bottom surface of the discharge guide tube (440). Furthermore, when the discharge guide plate 510 is fixed to the lower part of the grinding plate 500 to rotate together with the grinding plate 500, the discharge guide plate 510 is positioned inside the discharge guide tube 440, and the grinding plate 500 The sintered coal ash pulverized while rotating) falls into the discharge guide tube 440, and the sintered coal ash inside the discharge guide tube 440 is swept by the discharge guide plate 510 and guided to the inlet of the discharge pipe 400. At this time, one end of the exhaust duct 310 is located below the grinding plate 500 and inside the discharge guide tube 440 to suppress the sintered coal ash from entering the exhaust duct 310.

6 is a view schematically showing the configuration of the input unit for inserting the coal ash raw material 50 to the sintering furnace 100 in the embodiment of FIG. The coal ash raw material port 50 is accommodated in the storage tank 800 and then supplied to the bidirectional conveyor 760. The bi-directional conveyor 760 is provided with a wheel 770 at the bottom to move along a separate rail, etc. Also, the coal ash raw material port 50 received from the storage tank 800 is left or right based on the drawing direction. You can optionally proceed with In the arrangement relationship illustrated in FIG. 6, the bidirectional conveyor 760 proceeds to the right based on the drawing direction to drop the coal ash raw material port 50 into the feed hopper 700. The supply hopper 700 is provided with a supply valve 710 below, the supply valve 710 is a conical shape, it is operated up and down by the supply valve switch 720. When the supply valve 710 is opened, the coal ash raw material ports 50 accommodated in the supply hopper 700 are dropped into the gaps of the supply valve 710 to be received into the internal space of the sintering furnace 100. Supply hopper 700 is also provided with a wheel 730, it is preferably installed to be movable along the guide rail 750 for fixing fixed to the outside. Then, as in the case of the ignition unit 200 described above, it is possible to supply the coal ash raw material 50 to the plurality of sintering furnace 100 with one supply hopper 700.

7 is a front view schematically showing another embodiment of the apparatus for producing artificial aggregate using coal ash according to the present invention, and FIG. 8 is a plan view schematically showing the embodiment of FIG. 7.

Features that are not described below are the same as the embodiments described above with reference to FIGS. 1 to 6, and detailed descriptions thereof will be omitted to avoid duplication.

The sintering furnace 100 is provided with a plurality, it is arranged in accordance with a predetermined rule. For example, in FIGS. 7 and 8, four sintering furnaces 100 are arranged in two rows and two columns. An ignition guide rail 220 and a supply guide rail 750 are installed on the sintering furnace 100 of each row, and the ignition guide rail 220 and the supply guide rail 750 differ only in their functional names. In fact, it can be implemented as a single rail. That is, in the present embodiment, the ignition guide rail 220 and the supply guide rail 750 coincide with each other. The bidirectional conveyor 760 is positioned above the supply guide rail 750 and is positioned between the pair of supply guide rails 750.

The heat-resistant cart 210 is supported by the moving wheel 240 as an ignition part 200 on the ignition guide rail 220, and is located at a point spaced above the sintering furnace 100. It is. In addition, the supply hopper 700 is supported on the supply guide rail 750 to be movable by the wheel 730, it is also located at a point spaced above the sintering furnace (100). In this state, first, the storage tank 800 is opened to drop the coal ash raw material port to the bidirectional conveyor 760. The bidirectional conveyor 760 advances the coal ash raw material to either side, and feeds the coal ash raw material into the feed hopper 700. Then, the feed hopper 700 moves along the supply guide rail 750 and is positioned above any one of the sintering furnaces 100. When the feed valve 710 of the feed hopper 700 is opened at this position, the coal ash raw material is accommodated in the internal space of the sintering furnace 100. When the supply of coal ash raw material is completed, the feed hopper 700 is moved again to evacuate from above the sintering furnace 100. The retracted feed hopper 700 receives the new coal ash raw material and moves to another sintering furnace 100 and then supplies the coal ash raw material to the sintering furnace 100.

Next, the heat-resistant cart 210 in which the ignition fuel is combusted is moved above any one of the sintering furnaces 100, and close to the upper end of the sintering furnace 100, as described above, in close contact. At this time, when operating the exhaust fan 300 located at the other end of the lower end of the sintering furnace 100, air flow from the top to the bottom is formed in the inner space of the sintering furnace 100, in particular, the heat-resistant cart 210 is a sintering furnace ( Since it is in close contact with the upper end of 100, the heat or flame by the ignition fuel burning in the heat-resistant cart 210 passes through the bottom surface of the heat-resistant cart 210 to produce coal ash located at the top of the inner space of the sintering furnace 100. Ryogu 50 is reached. The coal ash raw material contains carbon, so it is ignited at an appropriate temperature condition. When the coal ash raw material begins to burn, the heat-resistant cart 210 is spaced apart from the upper end of the sintering furnace 100, and then evacuated from above the sintering furnace 100 along the ignition guide rail 220. The evacuated heat-resistant cart 210 moves above the other sintering furnace 100 to ignite the coal ash raw material housed in the sintering furnace 100.

Afterwards, the coal ash raw material housed in the inner space of the sintering furnace 100 is ignited and combusted from the upper one. Since the exhaust fan 300 continues to operate, the heat and flames of the combustion are transferred downward, and as a result, All the coal ash raw materials are burned and sintered. Exhaust fan 300 is illustrated as being separately provided in each sintering furnace 100, in this case it is free to adjust the amount of air exhausted according to the combustion state in each sintering furnace (100). . However, instead of omitting the exhaust fan 300 in each sintering furnace 100, it is also possible to connect the exhaust duct branched from one exhaust fan to each sintering furnace 100, in which case in each sintering furnace 100 Flow control valves can be installed in the branched exhaust duct to control the amount of exhaust air.

Figure 9 is a schematic cross-sectional view showing another embodiment of the apparatus for producing artificial aggregate using coal ash according to the present invention.

In this embodiment, the sintering furnace 100 'also has a hollow cylindrical shape with both ends open, and is generally vertically disposed. One end of the exhaust duct 310 'is connected to an upper end of the sintering furnace 100', and an exhaust fan 300 'is connected to the other end of the exhaust duct 310'. One side of the exhaust duct 310 'is provided with an openable and closed door 311', which is opened when the coal ash raw material is introduced into the sintering furnace 100 'and closed during combustion and sintering of the coal ash raw material. .

The bottom plate 110 'is provided at the lower end of the sintering furnace 100' to be opened and closed. A plurality of through holes is formed in the bottom plate 110 '. At this time, the through holes are for allowing heat or combustion flames to pass from below, as described above with reference to FIG. 2, and may be configured by arranging the plurality of great bars 111 ′ apart from each other. In addition, since the bottom plate 110 ′ is provided to be openable and closed, it is easy to discharge the sintered coal ash raw material, that is, sintered coal ash to the outside.

An ignition part 200 'is disposed below the sintering furnace 100', and a through hole (or a great bar) formed in the bottom plate 110 'of the sintering furnace 100' located above by burning the ignition fuel. Through the gap between) to ignite the coal ash raw material contained in the sintering furnace (100 '). At this time, when the exhaust fan 300 'is operated, an air flow flowing from the bottom to the upper direction is formed in the sintering furnace 100', and the coal ash raw material is also sequentially burned and sintered from the lower layer to the upper layer. Since the coal ash raw material of the lower layer is sintered first, there is an advantage that the deformation of the sintered coal ash raw material is small and does not easily agglomerate as compared with the above-mentioned crushed coal ash raw material as the first embodiment.

Hereinafter, a preferred embodiment of the method for producing artificial aggregate using coal ash according to the present invention will be described in detail.

First, a raw material consisting of 90 to 97 parts by weight of coal ash, 2 to 10 parts by weight of binder, and 0 to 1 parts by weight of additives is blended (mixing step). The result is a coal ash raw material for producing artificial aggregate using coal ash according to the present invention. Thus, the above-described features can be added.

Next, the blended raw material is put into a hollow cylindrical shape, and the sintering furnace at both ends is opened (injection step). At this time, the sintering furnace may also be the same as the sintering furnace described above for the apparatus for producing artificial aggregate using coal ash according to the present invention.

The injected raw material is ignited from one end of both open ends of the sintering furnace (ignition step). Then, air is forcedly exhausted from the other end of both ends of the sintering furnace (exhaust step). Then, the raw materials in the sintering furnace are sequentially burned and sintered from one end to the other end. At this time, it is preferable that one end of the sintering furnace is located higher than the other end. In particular, it is preferable that the one end and the other end of the sintering furnace are arranged on one vertical line, that is, the sintering furnace is arranged vertically. At this time, the raw materials inside the sintering furnace are burned and sintered in order from the upper side to the lower side. When the upper side is combusted, the lower side is dried and preheated by the heat of combustion, while the lower side is burned, Natural cooling in the state of completion of sintering. Therefore, the effect of preheating and cooling can be obtained in one sintering furnace without the need for a separate process for preheating and cooling.

When sintering is completed, the raw materials attached to each other are pulverized and discharged to the outside (discharge step). The sintered raw material thus discharged can be used as aggregate. For example, it can be used as aggregate as concrete admixture, which is required to have a suitable size and shape. Therefore, it is preferable to further include a molding step of forming the raw material into a mass before the feeding step.

One embodiment of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

1 is a cross-sectional view schematically showing an embodiment of an apparatus for producing artificial aggregate using coal ash according to the present invention;

Figure 2 is an enlarged cross-sectional view of the upper portion of the embodiment of FIG.

3 is a perspective view of the great bar of the embodiment of FIG.

4 is an enlarged cross-sectional view of a lower part of the embodiment of FIG. 1;

5 is an enlarged cross-sectional view of the discharge pipe and the discharge valve of the embodiment of FIG.

6 is a view schematically showing the configuration of the embodiment input unit of FIG.

7 is a front view schematically showing another embodiment of an apparatus for producing artificial aggregate using coal ash according to the present invention;

8 is a plan view schematically showing the embodiment of FIG.

Figure 9 is a schematic cross-sectional view showing another embodiment of the apparatus for producing artificial aggregate using coal ash according to the present invention.

Claims (25)

It includes 90 to 97 parts by weight of coal ash, 2 to 10 parts by weight of binder, more than 0 to 1 part by weight of additives, The chemical composition of the mixture consisting of coal ash and additives SiO ₂ 45 or more 60 or less parts by weight, Al ₂ O ₃ 20 or more and 35 or less parts by weight, Fe ₂ O ₃ 7 or more by weight or less by weight, CaO 0 or more by weight 4 or less by weight, K ₂ O 0.1 or more by 0.3 or less by weight, Na ₂ O 0.1 or more and 0.3 or less by weight, MgO 0 or more by 0.2 or less by weight, C 5 or more, 8 or less by weight, artificial aggregate using coal ash. delete The method of claim 1, The plasticity index of the binder is artificial aggregate using coal ash, characterized in that greater than 14. The method of claim 1, The binder is an artificial aggregate using coal ash, characterized in that it comprises at least one selected from the group consisting of clay, water glass and pulp sludge. The method of claim 1, The additive is an artificial aggregate using coal ash, characterized in that it comprises at least one selected from the group consisting of salt, hematite, water glass and basalt. A hollow cylindrical shape having both ends open and receiving and sintering raw materials including 90 to 97 parts by weight of coal ash, 2 to 10 parts by weight of binder, and more than 0 to 1 part by weight of additive in an internal space formed by the hollow. For sintering furnace, An ignition unit disposed at one end of the sintering furnace, Is disposed at the other end of the sintering furnace and includes an exhaust fan for forcibly discharging the air in the internal space of the sintering furnace to the outside, The sintering furnace manufacturing apparatus of artificial aggregate using coal ash, characterized in that the one end is disposed to be located at a point higher than the other end. delete The method of claim 6, The ignition unit, the apparatus for producing artificial aggregate using coal ash, characterized in that it comprises a container-shaped heat-resistant cart containing a fuel and a plurality of through-holes in the bottom surface. 9. The method of claim 8, The bottom surface of the heat-resistant cart is an artificial aggregate manufacturing apparatus using coal ash, characterized in that formed by a plurality of great bars disposed spaced apart from each other. 9. The method of claim 8, Guide rail fixedly installed on the outside, A bearing installed under the heat-resistant cart, It is rotatably installed by the bearing and the apparatus for producing artificial aggregate using coal ash, characterized in that it further comprises a moving wheel moving along the guide rail. The method of claim 10, Apparatus for producing artificial aggregate using coal ash further comprising a linear actuator installed between the heat-resistant cart and the bearing. 11. The method according to any one of claims 8 to 10, The heat-resistant cart is an apparatus for producing an artificial aggregate using coal ash, characterized in that it is operated so as to be spaced from or close to one end of the sintering furnace. The method of claim 6, Further comprising an exhaust duct disposed so that one end is in communication with the inner space of the sintering furnace through the other end of the sintering furnace, The exhaust fan is an apparatus for producing artificial aggregate using coal ash, characterized in that connected to the other end of the exhaust duct. 14. The method of claim 13, A discharge pipe installed to communicate with an inner space of the sintering furnace through the other end of the sintering furnace; Apparatus for producing artificial aggregate using coal ash, characterized in that it further comprises a discharge valve for opening and closing the discharge pipe. The method of claim 14, The discharge valve is a disk having a diameter greater than or equal to the outer diameter of the discharge pipe, the discharge valve having a diameter less than or equal to the inner diameter of the discharge pipe is formed through the discharge valve, and rotates about an axis parallel to the pipe axis of the discharge pipe. Apparatus for producing artificial aggregate using coal ash, characterized in that the plate surface comprises a rotary valve plate disposed to close the other end of the discharge pipe. The method according to claim 13 or 14, Apparatus for producing artificial aggregate using coal ash, characterized in that it further comprises a pulverized plate rotatably provided with the center of rotation of the hollow central axis of the sintering furnace above one end of the exhaust duct. 17. The method of claim 16, The grinding plate is an apparatus for producing artificial aggregate using coal ash, characterized in that the horn-shaped protrusions formed on the surface. 17. The method of claim 16, A ring-shaped discharge guide tube installed between the other end of the sintering furnace and one end of the discharge pipe; A discharge guide plate installed at a lower end of the grinding plate and rotating along the discharge guide tube; One end of the discharge pipe is an apparatus for producing artificial aggregate using coal ash, characterized in that installed so as to communicate with the discharge guide tube. The method of claim 6, The sintering furnace is an apparatus for producing artificial aggregate using coal ash, characterized in that arranged so that one end is located at a point lower than the other end. 20. The method of claim 19, Apparatus for producing artificial aggregate using coal ash, characterized in that it further comprises a plurality of great bars disposed spaced apart from each other at one end of the sintering furnace. 20. The method of claim 19, It further comprises an exhaust duct disposed to cover the other end of the sintering furnace, the exhaust duct provided with an opening and closing door, The exhaust fan is an apparatus for producing artificial aggregate using coal ash, characterized in that connected to the exhaust duct. A hollow cylindrical shape having open ends at each end, the raw material including 90 to 97 parts by weight of coal ash, 2 to 10 parts by weight of binder, 2 to 10 parts by weight of additive, and 0 to 1 part by weight of additive is sintered in the inner space formed by the hollow. A plurality of sintering furnaces arranged to be spaced apart from each other, A guide rail fixedly installed to pass upwardly of each of the plurality of sintering furnaces; A heat-resistant cart containing fuel and having a plurality of through holes formed in a bottom thereof, and moving along the guide rail; Apparatus for producing artificial aggregate using coal ash disposed on the other end of each sintering furnace including an exhaust fan for forcibly discharging the air in the internal space of the sintering furnace to the outside. A blending step of blending a raw material consisting of 90 to 97 parts by weight of coal ash, 2 to 10 parts by weight of a binder, and 0 to 1 part by weight of an additive; Inputting the blended raw materials into a hollow cylindrical sintering furnace having open ends; An ignition step of igniting the raw material at one end of the sintering furnace; An exhausting step of forcibly discharging air from the sintering furnace at the other end of the sintering furnace; It includes a crushing step of grinding the artificial aggregate produced by sintering the raw material, Method of producing artificial aggregate using coal ash, characterized in that it further comprises a molding step of forming the raw material into a mass before the input step. delete 24. The method of claim 23, One end of the sintering furnace manufacturing method of artificial aggregate using coal ash, characterized in that disposed higher than the other end.

Images