Method for preparing inorganic fiber from vaporized slag and inorganic fiber

Abstract

The invention relates to the technical field of waste utilization, in particular to a method for preparing inorganic fibers from vaporized slag and the inorganic fibers. The method comprises the following steps: removing carbon from the vaporized slag; mixing the vaporized slag subjected to carbon removal treatment, a conductive agent and water to obtain a mixture; placing the mixture in a fiber generation container, pressurizing to a preset pressure intensity in the atmosphere of protective gas, and then heating to a preset temperature to obtain a molten mixture; keeping the temperature and the pressure for a preset time at a preset temperature, and testing the viscosity of the molten mixture; after the preset viscosity is reached, the power supply is turned on to form a uniform electric field between the metal pipe body and the rotary receiving roller, and the rotary receiving roller rotates at the same time, so that the molten mixture is output from the metal pipe body to the rotary receiving roller to be cured to form fibers. The embodiment of the invention provides a method for preparing an inorganic fiber by using vaporized slag and the inorganic fiber. The method can be used for preparing the inorganic fiber with high additional value by using the vaporized slag.

Description

Technical Field

[0001] The present invention relates to the technical field of waste utilization, and in particular to a method for preparing inorganic fiber by utilizing vaporized slag and the inorganic fiber. Background Art

[0002] Gasification slag is a solid waste composed of fine particles, produced during the gasification process. Stacking or landfilling the slag can cause land pollution and waste.

[0003] In view of the above problems, there is an urgent need for a method to rationally utilize vaporized slag to obtain high value-added products. Summary of the Invention

[0004] The embodiments of the present invention provide a method for preparing inorganic fiber by using vaporized slag and the inorganic fiber, which can prepare high-value-added inorganic fiber by using vaporized slag.

[0005] In a first aspect, an embodiment of the present invention provides a method for preparing inorganic fibers using vaporized slag, comprising:

[0006] Decarbonize the vaporized slag;

[0007] mixing the decarbonized vaporized slag, a conductive agent, and water to obtain a mixture;

[0008] The mixture is placed in a fiber generation container, pressurized to a preset pressure in an atmosphere of protective gas, and then heated to a preset temperature to obtain a molten mixture; wherein the fiber generation container is connected to a plurality of injection units, each of the injection units includes a plurality of metal tubes connected to the interior of the fiber generation container, the metal tubes are made of a high-temperature alloy, the metal tubes in each injection unit are spaced uniformly, each metal tube is connected to a power supply, and a rotating receiving roller is provided at one end of the metal tube away from the fiber generation container, and the rotating receiving roller is grounded;

[0009] Maintaining the temperature and pressure at the preset temperature for a preset time, and testing the viscosity of the molten mixture;

[0010] After reaching the preset viscosity, the power supply is turned on to form a uniform electric field between the metal tube and the rotating receiving roller, and the rotating receiving roller rotates at the same time, so that the molten mixture is output from the metal tube to the rotating receiving roller and solidified to form fibers.

[0011] In one possible design, the vaporized slag is subjected to a decarbonization process including:

[0012] Placing the vaporized slag in a high-temperature oxidation chamber, and introducing high-pressure hot gas containing oxygen into the high-temperature oxidation chamber; wherein the bottom plate of the high-temperature oxidation chamber is provided with a plurality of holes, and the bottom of the high-temperature oxidation chamber is connected to a sorting oxidation channel through the holes, and the sorting oxidation channel is inclined downward at one end away from the high-temperature oxidation chamber to form an inclined channel, and a plurality of thermal resistors and ultrasonic transmitters are provided at the bottom of the inclined channel, wherein the thermal resistors are used to provide heat into the inclined channel, and the ultrasonic transmitter is used to provide ultrasonic waves into the inclined channel;

[0013] Turning on the ultrasonic transmitter and the thermal resistor;

[0014] The vaporized slag that has completed the decarbonization process is received at the lower end of the inclined channel.

[0015] In one possible design, the fiber generating container is connected to an air pump via a gas pipeline, and the fiber generating container is connected to the plurality of the injection units via a high-temperature and high-pressure valve;

[0016] The fiber generation container is located in a closed space, and the closed space is connected to the outside through a pressure regulating pipe and a cooling pipe;

[0017] After reaching the preset viscosity, it also includes:

[0018] Regulating the air pressure in the enclosed space through the pressure regulating pipe to control the rate at which the metal pipe outputs the fluid;

[0019] The temperature in the enclosed space is lowered by the cooling pipe.

[0020] In one possible design, testing the viscosity of the molten mixture includes: testing the viscosity of the molten mixture using an ultrasonic pulse echo method.

[0021] In a possible design, the voltage applied by the power supply is 20-40 kV, the rotation speed of the rotating receiving roller is 1500-5500 rpm, and the intervals between the metal tubes are 2-5 cm.

[0022] In a possible design, the preset temperature is 900-1000° C., and the preset pressure is 22-30 MPa.

[0023] In a possible design, the preset time is 1 to 3 hours.

[0024] In a possible design, the mass fraction of water in the mixture is 4-8%.

[0025] In a possible design, the conductive agent includes sodium oxide and / or potassium oxide, and the mass fraction of the conductive agent in the mixture is 0.1-0.2%.

[0026] In a second aspect, an embodiment of the present invention further provides an inorganic fiber prepared according to any of the above methods.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] In the present application, the vaporized slag is first decarbonized, and then the decarbonized vaporized slag, a conductive agent and water are mixed to obtain a mixture; wherein the conductive agent can greatly increase the electrical conductivity of the mixture after melting, and the water can destroy the silicon dioxide tetrahedron network of the vaporized slag, greatly reducing the viscosity of the mixture after melting. After obtaining the mixture, it is placed in a fiber generating container, and in a protective gas atmosphere, the pressure in the fiber generating container is increased to a preset pressure, and then the temperature is raised to a preset temperature, for example, by heating with a high-temperature resistor, or by electromagnetic induction heating. At the preset pressure and preset temperature, the water in the mixture is in a supercritical state and melts into the molten mixture to achieve the destruction of the silicon dioxide tetrahedron. It should be noted that if there is no high pressure, the water will escape from the molten mixture in the form of water vapor, and the viscosity of the molten mixture cannot be effectively reduced. The device is kept warm under high temperature and high pressure for a preset time. After the water is fully dissolved and the viscosity is fully reduced to the preset viscosity, the power is turned on to form a uniform electric field between the metal tube and the rotating receiving roller. The molten mixture is ejected from the metal tube. Under the action of the conductive agent, the molten mixture is charged. The molten mixture ejected from the metal tube forms a Taylor cone under the action of the electric field, that is, the ejected liquid is dispersed into multiple micron or nanometer-scale fluids. The water evaporates in the process of forming the fluid. The surface of the micro-nanoscale fluid is extremely small and the cooling speed is extremely fast. During the ejection process, the temperature and pressure are rapidly reduced to form solid fiber filaments, which are finally collected on the rotating receiving roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic structural diagram of a device for preparing fibers according to an embodiment of the present invention;

[0031] Figure 2 A schematic structural diagram of a device for carbon removal provided in an embodiment of the present invention.

[0032] In the picture:

[0033] 100-enclosed space;

[0034] 1-Fiber generation container;

[0035] 2- injection unit;

[0036] 21-Metal pipe body;

[0037] 3- Power supply;

[0038] 4-rotating receiving roller;

[0039] 5-High temperature and high pressure valve;

[0040] 6-Gas pipeline;

[0041] 7-pressure regulating pipeline;

[0042] 8-Cooling pipe;

[0043] 9-High temperature oxidation chamber;

[0044] 91-hole;

[0045] 10-Separation oxidation pipeline;

[0046] 101- inclined channel;

[0047] 11-thermal resistance;

[0048] 12-Ultrasonic transmitter. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0050] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "plurality" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the description of this specification, it should be understood that the directional terms such as "upper" and "lower" described in the embodiments of the present invention are described from the perspectives shown in the accompanying drawings and should not be understood as limiting the embodiments of the present invention. In addition, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" of another element, it can not only be directly connected "upper" or "lower" of the other element, but also indirectly connected "upper" or "lower" of the other element through an intermediate element.

[0052] like Figure 1 As shown, an embodiment of the present invention provides a method for preparing inorganic fiber using vaporized slag, comprising:

[0053] Decarbonize the vaporized slag;

[0054] mixing the decarbonized vaporized slag, a conductive agent, and water to obtain a mixture;

[0055] The mixture is placed in a fiber generation container 1 and pressurized to a preset pressure in a protective gas atmosphere, and then heated to a preset temperature to obtain a molten mixture; wherein the fiber generation container 1 is connected to a plurality of injection units 2, each injection unit 2 includes a plurality of metal tubes 21 connected to the interior of the fiber generation container 1, and the preparation material of the metal tubes 21 is a high-temperature alloy. In each injection unit 2, the intervals between the metal tubes 21 are the same, and each metal tube 21 is connected to a power supply 3 ( Figure 1 Only one electrical connection line between the metal tube 21 and the power supply 3 is shown, and the other electrical connection lines are not shown). A rotating receiving roller 4 is provided at one end of the metal tube 21 away from the fiber generating container, and the rotating receiving roller 4 is grounded;

[0056] Maintaining the temperature and pressure at a preset temperature for a preset time and testing the viscosity of the molten mixture;

[0057] After reaching the preset viscosity, the power supply 3 is turned on to form a uniform electric field between the metal tube 21 and the rotating receiving roller 4. At the same time, the rotating receiving roller 4 rotates to output the molten mixture from the metal tube 21 to the rotating receiving roller 4 to solidify and form fibers.

[0058] The main technique for producing inorganic fibers is melt-drawing basalt particles, which requires precise control of temperature and viscosity. However, the composition and particle size of vaporized slag are not stable, making it difficult to produce high-quality fibers using current melt-drawing methods.

[0059] In the present application, the vaporized slag is first decarbonized, and then the decarbonized vaporized slag, a conductive agent and water are mixed to obtain a mixture; wherein the conductive agent can greatly increase the electrical conductivity of the mixture after melting, and the water can destroy the silicon dioxide tetrahedron network of the vaporized slag, greatly reducing the viscosity of the mixture after melting. After obtaining the mixture, it is placed in a fiber generation container 1, and in a protective gas atmosphere, the pressure in the fiber generation container 1 is increased to a preset pressure, and then the temperature is raised to a preset temperature, for example, by a high-temperature resistor or by electromagnetic induction heating. At the preset pressure and preset temperature, the water in the mixture is in a supercritical state and melts into the molten mixture to achieve the destruction of the silicon dioxide tetrahedron. It should be noted that if there is no high pressure, the water will escape from the molten mixture in the form of water vapor, and the viscosity of the molten mixture cannot be effectively reduced. The mixture is kept warm at high temperature and high pressure for a preset time. After the water is fully dissolved and the viscosity is fully reduced to the preset viscosity, the power supply 3 is turned on to form a uniform electric field between the metal tube body 21 and the rotating receiving roller 4. The molten mixture is ejected from the metal tube body 21. Under the action of the conductive agent, the molten mixture is charged. The molten mixture ejected from the metal tube body 21 forms a Taylor cone under the action of the electric field, that is, the ejected liquid is dispersed into multiple micron or nanometer-scale fluids. The water evaporates in the process of forming the fluid. The surface of the micro-nanoscale fluid is extremely small and the cooling speed is extremely fast. During the ejection process, the temperature and pressure are rapidly reduced to form solid fiber filaments, which are finally collected on the rotating rotating receiving roller 4.

[0060] In this embodiment, each spraying unit 2 includes a plurality of metal tubes 21 , and the fibers generated by adjacent metal tubes 21 are automatically entangled into tows during the solidification and collection process, that is, each spraying unit 2 can obtain a bundle of fiber tows.

[0061] In this embodiment, the metal tube 21 may be made of a platinum-rhodium alloy or a titanium alloy.

[0062] Please refer to Figure 2 In some embodiments of the present invention, the vaporized slag is subjected to a decarbonization treatment, comprising:

[0063] The vaporized slag is placed in a high temperature oxidation chamber 9, and high pressure hot gas containing oxygen is introduced into the high temperature oxidation chamber 9 (the gas introduction pipe Figure 2 (not shown); wherein, the bottom plate of the high-temperature oxidation chamber 9 is provided with a plurality of holes 91, and the bottom of the high-temperature oxidation chamber 9 is connected to a sorting oxidation channel 10 through the holes 91. The sorting oxidation channel 10 is inclined downward at one end away from the high-temperature oxidation chamber 9 to form an inclined channel 101. A plurality of thermal resistors 11 and ultrasonic transmitters 12 are provided at the bottom of the inclined channel 101. The thermal resistors 11 are used to provide heat to the inclined channel 101, and the ultrasonic transmitters 12 are used to provide ultrasonic waves to the inclined channel 101.

[0064] Turn on the ultrasonic transmitter 12 and the thermal resistor 11;

[0065] The vaporized slag that has completed the decarbonization process is received at the lower end of the inclined channel 101 .

[0066] In this embodiment, high-pressure hot gas entering high-temperature oxidation chamber 9 heats the vaporized slag, oxidizing any remaining carbon. Simultaneously, it applies pressure, causing the vaporized slag at the bottom to eject through holes 91 and into separation and oxidation channel 10. The low pressure within the oxidation channel causes the pressure differential to disperse the vaporized slag, allowing it to fully come into contact with the hot gas and further decarbonize. The dispersed vaporized slag falls into inclined channel 101, where thermal resistors 11 at the bottom continue to heat the vaporized slag, further decarbonizing it. Simultaneously, ultrasonic transmitters 12 emit ultrasonic waves toward the bottom of inclined channel 101, causing the vaporized slag on the bottom of inclined channel 101 to jump, preventing it from agglomerating and allowing it to fully come into contact with the hot gas at high temperatures, achieving complete oxidation and decarbonization.

[0067] In some embodiments of the present invention, the fiber generating container 1 is connected to an air pump via a gas pipeline 6 , and the fiber generating container 1 is connected to the plurality of injection units 2 via a high-temperature and high-pressure valve 5 ;

[0068] The fiber generating container 1 is located in a closed space 100, which is connected to the outside through a pressure regulating pipe 7 and a cooling pipe 8;

[0069] After reaching the preset viscosity, it also includes:

[0070] The air pressure in the enclosed space 100 is adjusted through the pressure regulating pipe 7 to control the rate at which the fluid is output from the metal tube 21;

[0071] The temperature in the closed space 100 is lowered by the cooling pipe 8 .

[0072] In this embodiment, a protective gas can be introduced into the fiber generation container 1 through the gas pipe 6, and the pressure can be increased by a compression device such as an air pump or a compression pump. During the heat preservation stage, the fluid cannot be output through the metal tube body 21. Therefore, a high-temperature and high-pressure valve 5 is provided. The high-temperature and high-pressure valve 5 can be composed of a high-temperature and high-pressure resistant silicon carbide ball valve and a high-purity flexible graphite seal. After the preset viscosity is met, the high-temperature and high-pressure valve 5 can be opened to output the fluid. After the valve is opened, the high pressure in the fiber generation container 1 is the driving force for the fluid to be ejected. The metal tube body 21 is located in the same plane and is in the liquid. The pressure received is the same, the pressure of the jet is the same, and the outflow velocity is the same. Therefore, uniform and stable fibers can be obtained.

[0073] It should be noted that the pressure regulating pipe 7 and the cooling pipe 8 can be the same pipe, and a compressed cooling medium, such as dry ice or liquid nitrogen, is used to pressurize and cool the enclosed space 100. A pressure relief valve can be provided in the enclosed space 100 to prevent the cooling medium from expanding due to heat and causing excessive pressure in the enclosed space 100.

[0074] In this embodiment, since the temperature and pressure in the fiber generating container 1 are relatively high, in order to balance the internal and external pressures, it is placed in a closed space 100 whose pressure can be adjusted by a pressure regulating pipe 7; in order to quickly cool and discharge heat, a cooling medium can be transported into the closed space 100 using a cooling pipe 8.

[0075] In some embodiments of the present invention, testing the viscosity of the molten mixture includes: testing the viscosity of the molten mixture using an ultrasonic pulse echo method.

[0076] In some embodiments of the present invention, the voltage applied by the power supply 3 is 20-40 kV, the rotation speed of the rotating receiving roller 4 is 1500-5500 rpm, and the intervals between the metal tubes 21 are 2-5 cm.

[0077] In some embodiments of the present invention, the preset temperature is 900-1000° C., and the preset pressure is 22-30 MPa.

[0078] In this embodiment, the preset temperature is 900-1000°C. The addition of water not only reduces the viscosity of the molten mixture but also lowers its melting temperature. The preset pressure is within the range of 22-30 MPa, which can compress the water into a supercritical state and dissolve it in the molten mixture. If it is below 22 MPa, the water will not dissolve in the molten mixture. If it is above 30 MPa, the pressure is too high, and not only will the increased pressure not further improve the fluidity of the molten mixture, but it will actually reduce the fluidity.

[0079] In some embodiments of the present invention, the preset time is 1 to 3 hours.

[0080] In some embodiments of the present invention, the mass fraction of water in the mixture is 4-8%.

[0081] In this embodiment, if the water content is less than 4% by weight, the effect on viscosity and temperature is insignificant, and the silicon tetrahedron network cannot be fully disrupted, resulting in substandard viscosity and poor fiber quality. If the water content exceeds 8% by weight, the excessive water content will produce excessive volatiles during the jetting process, causing jet discontinuity.

[0082] In some embodiments of the present invention, the conductive agent includes sodium oxide and / or potassium oxide, and the mass fraction of the conductive agent in the mixture is 0.1-0.2%.

[0083] In this embodiment, if the mass fraction of the conductive agent is less than 0.1%, the conductivity of the molten mixture is reduced and a good Taylor cone cannot be generated; if the mass fraction of the conductive agent is greater than 0.2%, the quality of the fiber of the molten mixture is reduced;

[0084] An embodiment of the present invention further provides an inorganic fiber prepared according to any of the above methods.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for preparing inorganic fiber using vaporized slag, characterized in that: include: Decarbonize the vaporized slag; mixing the decarbonized vaporized slag, a conductive agent, and water to obtain a mixture; The mixture is placed in a fiber generating container (1), pressurized to a preset pressure in an atmosphere of protective gas, and then heated to a preset temperature to obtain a molten mixture; wherein the fiber generating container (1) is connected to a plurality of injection units (2), each of the injection units (2) comprises a plurality of metal tubes (21) connected to the interior of the fiber generating container (1), the metal tubes (21) are made of a high-temperature alloy, the metal tubes (21) in each injection unit (2) are spaced at the same interval, each of the metal tubes (21) is connected to a power supply (3), and a rotating receiving roller (4) is provided at one end of the metal tube (21) away from the fiber generating container, and the rotating receiving roller (4) is grounded; Maintaining the temperature and pressure at the preset temperature for a preset time, and testing the viscosity of the molten mixture; After reaching a preset viscosity, the power supply (3) is turned on to form a uniform electric field between the metal tube (21) and the rotating receiving roller (4), and the rotating receiving roller (4) rotates at the same time, so that the molten mixture is output from the metal tube (21) to the rotating receiving roller (4) to solidify and form fibers.

2. The method according to claim 1, characterized in that Decarbonization treatment of vaporized slag, including: The vaporized slag is placed in a high-temperature oxidation chamber (9), and high-pressure hot gas containing oxygen is introduced into the high-temperature oxidation chamber (9); wherein the bottom plate of the high-temperature oxidation chamber (9) is provided with a plurality of holes (91), and the bottom of the high-temperature oxidation chamber (9) is connected to a sorting oxidation channel (10) through the holes (91), and the sorting oxidation channel (10) is tilted downward at one end away from the high-temperature oxidation chamber (9) to form an inclined channel (101), and a plurality of thermal resistors (11) and ultrasonic transmitters (12) are provided at the bottom of the inclined channel (101), wherein the thermal resistors (11) are used to provide heat to the inclined channel (101), and the ultrasonic transmitters (12) are used to provide ultrasonic waves to the inclined channel (101); Turning on the ultrasonic transmitter (12) and the thermal resistor (11); The vaporized slag that has completed the decarbonization treatment is received at the lower end of the inclined channel (101).

3. The method according to claim 1, characterized in that The fiber generating container (1) is connected to an air pump via a gas pipeline (6), and the fiber generating container (1) is connected to the plurality of injection units (2) via a high-temperature and high-pressure valve (5); The fiber generation container (1) is located in a closed space (100), and the closed space (100) is connected to the outside through a pressure regulating pipe (7) and a cooling pipe (8); After reaching the preset viscosity, it also includes: The air pressure in the closed space (100) is adjusted through the pressure regulating pipe (7) to control the rate at which the metal pipe (21) outputs the fluid; The temperature in the closed space (100) is lowered by the cooling pipe (8).

4. The method according to claim 1, wherein Testing the viscosity of the molten mixture includes: testing the viscosity of the molten mixture using an ultrasonic pulse echo method.

5. The method according to claim 1, wherein The voltage applied by the power supply (3) is 20 to 40 kV, the rotation speed of the rotating receiving roller (4) is 1500 to 5500 rpm, and the intervals between the metal tubes (21) are 2 to 5 cm.

6. The method according to claim 1, characterized in that The preset temperature is 900-1000° C., and the preset pressure is 22-30 MPa.

7. The method according to claim 1, characterized in that The preset time is 1 to 3 hours.

8. The method according to claim 1, characterized in that In the mixture, the mass fraction of water is 4 to 8%.

9. The method according to claim 1, characterized in that The conductive agent includes sodium oxide and / or potassium oxide, and the mass fraction of the conductive agent in the mixture is 0.1-0.2%.

10. An inorganic fiber, characterized in that Prepared according to any one of claims 1 to 9.

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