A method for preparing inorganic plates using vaporized slag

Abstract

This invention relates to the field of waste utilization technology, and in particular to a method for preparing inorganic boards using gasified slag. The method includes: heating a mixture comprising gasified slag, water, and a conductive agent to a molten state and placing it in a fiber-generating container; pressurizing the mixture to a preset pressure under a protective gas atmosphere; and then heating it to a preset temperature to obtain a molten mixture. The fiber-generating container is connected to multiple metal tubes, with a rotatable rotating disk at one end of each metal tube away from the container. A pressure roller is positioned above the rotating disk. The mixture is held at a preset temperature and pressure for a preset time, and the viscosity of the molten mixture is tested. Once the preset viscosity is reached, a power source is turned on to create a uniform electric field between the metal tubes and the rotating disk. Simultaneously, the rotating disk rotates, receiving fiber filaments output from the metal tubes and rotating the received fiber filaments to the pressure roller for flattening. The method provided by this invention enables the preparation of high-value-added products using gasified slag.

Description

Technical Field

[0001] This invention relates to the field of waste utilization technology, and in particular to a method for preparing inorganic plates using vaporized slag. Background Technology

[0002] Gasification slag is a waste residue generated during the gasification process; it is a solid waste composed of fine particles. Piling or burying gasification slag will cause land pollution or waste.

[0003] To address the aforementioned issues, there is an urgent need for a method to prepare inorganic plates using gasification slag, which would enable the utilization of gasification slag as a waste product and yield high-value-added products. Summary of the Invention

[0004] This invention provides a method for preparing inorganic plates using vaporization slag, which enables the utilization of vaporization slag as a waste to obtain high-value-added products.

[0005] This invention provides a method for preparing inorganic plates using vaporized slag, comprising:

[0006] A mixture comprising vaporized slag, water, and a conductive agent is heated to a molten state and placed in a fiber-generating container. The mixture is then pressurized to a preset pressure under a protective gas atmosphere and heated to a preset temperature to obtain a molten mixture. The fiber-generating container is connected to multiple metal tubes made of a high-temperature alloy. Each metal tube is connected to a power source. A rotatable rotating disk is located at the end of each metal tube furthest from the fiber-generating container. The axis of the rotating disk is parallel to the axis of the metal tube. A pressure roller is positioned above the rotating disk, with the vertical projection of the roller's axial direction coinciding with the diameter of the rotating disk. The pressure roller presses against the rotating disk.

[0007] The mixture is kept at the preset temperature and pressure for a preset time, and the viscosity of the molten mixture is tested.

[0008] Once the preset viscosity is reached, the power supply is turned on to form a uniform electric field between the metal tube and the rotating disk. At the same time, the rotating disk rotates, receives the fiber filaments output from the metal tube, and rotates the received fiber filaments to the pressure roller to flatten them.

[0009] In one possible design, the pressure roller includes a roller body and a rotating shaft. The roller body is sleeved outside the rotating shaft and rotatably connected thereto. The rotating shaft is fixedly connected to a connecting rod perpendicular to the rotating disk. A pressure sensor is installed on the connecting rod to collect the vertical force on the pressure roller.

[0010] The method further includes:

[0011] Adjust the connecting rod vertically according to the pressure sensor reading to keep the pressure sensor reading within a preset range.

[0012] In one possible design, the pressure roller is equipped with a thermal resistor inside to heat the pressure roller to the pressing temperature.

[0013] In one possible design, the vaporized slag in the mixture is vaporized slag obtained by decarbonization and purification to obtain purified powder, and different purified powders are weighed according to a preset ratio. The decarbonization and purification steps include:

[0014] The gasification slag is sorted to obtain gasification slag groups with different particle size ranges;

[0015] Different vaporized slag groups are placed in a hot air sorting device; wherein, the hot air sorting device includes multiple sorting units, each sorting unit includes a hopper and a sedimentation hopper located below the hopper, the multiple hoppers are respectively used to hold different vaporized slag groups, the bottom of the hopper is provided with a strip-shaped connecting hole, the connecting hole connects the hopper and the sedimentation hopper, each sedimentation hopper is provided with a gas supply pipe, the length of the strip-shaped gas outlet of the gas supply pipe matches the length of the connecting hole;

[0016] High-temperature gas is supplied to the deposition chamber through the gas pipeline, causing the powder falling through the connecting hole to be heated and decarbonized by the high-temperature gas. Under the action of aerodynamic force, the powder gains an initial velocity, causing particles of different densities to eventually fall into different areas at the bottom of the deposition chamber. Initially separated powders with different main components are collected at different positions at the bottom of each deposition chamber, and the main components in the initial separated powders are purified to obtain the purified powder.

[0017] In one possible design, prior to the output of high-temperature gas into the deposition chamber via the gas pipeline, the following is also included:

[0018] The flow rate of the high-temperature gas output from the gas delivery pipeline is determined based on the particle size range of the particles in the silo.

[0019] In one possible design, multiple sorting units are stacked, the height of the hopper is the same as the height of the sedimentation hopper, the hopper is located above the sedimentation hopper of the same sorting unit on the side where the gas pipeline is located, the right-angle space formed by the hopper and the sedimentation hopper of one sorting unit is spliced ​​to the sedimentation hopper of another sorting unit, and the hoppers of two adjacent sorting units are located in different directions.

[0020] In one possible design, the voltage applied by the power supply is 20-40kV, the rotation speed of the rotating disk is 500-2500rpm, and the metal tubes are spaced 2-5cm apart.

[0021] In one possible design, the preset pressure is 22–30 MPa.

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

[0023] In one possible design, the water content is 4-8% by mass.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] In this embodiment, vaporized slag, a conductive agent, and water are mixed to obtain a mixture. The conductive agent significantly increases the conductivity of the molten mixture, while the water disrupts the silicon-oxygen tetrahedral network of silica in the vaporized slag, greatly reducing the viscosity of the molten mixture. After obtaining the mixture, it is placed in a fiber-forming container. Under a protective gas atmosphere, the pressure in the fiber-forming container is increased to a preset pressure, and then the temperature is raised to a preset temperature. This can be achieved, for example, through high-temperature resistance heating or electromagnetic induction heating. At the preset pressure and temperature, the water in the mixture is in a supercritical state and dissolves into the molten mixture, thus disrupting the silicon-oxygen tetrahedron network. It should be noted that without high pressure, the water will escape from the molten mixture as steam, failing to effectively reduce the viscosity of the molten mixture. Under high temperature and pressure, the mixture is kept at a preset temperature for a set time until the water is fully dissolved and the viscosity is reduced to the preset viscosity. Then, the power is turned on, creating a uniform electric field between the metal tube and the rotating disk. The molten mixture is ejected from the metal tube. Under the action of the conductive agent, the molten mixture becomes charged. The ejected molten mixture forms a Taylor cone under the influence of the electric field, meaning the ejected liquid disperses into multiple micron or nanometer-sized fluids. Water evaporates during the fluid formation process. The micron- and nanometer-sized fluids have extremely small surface areas and cool very quickly, rapidly cooling and depressurizing during ejection to form solid fiber filaments, which are eventually collected on the rotating disk. The rotating disk continues to rotate, bringing the relatively loose fiber filaments collected on it to the pressure roller, where the roller compacts them. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the apparatus for fiber preparation provided in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the hot air sorting device provided in an embodiment of the present invention.

[0029] In the picture:

[0030] 100 - Enclosed space;

[0031] 1-Fiber generating container;

[0032] 2-Metal pipe body;

[0033] 3-Power supply;

[0034] 4-Rotating disk; 41-Roller body; 42-Connecting rod; 43-Shaft;

[0035] 5-High temperature and high pressure valve;

[0036] 6-Gas pipeline;

[0037] 7-Pressure regulating pipeline;

[0038] 8-Cooling pipes;

[0039] 201-Hopper;

[0040] 202-Sedimentation Chamber;

[0041] 203 - Gas pipeline. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0043] In the description of the embodiments of the present invention, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or stated, the term "multiple" refers to two or more; the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be 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. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0044] In this specification, it should be understood that the directional terms such as "upper" and "lower" used in the description of the embodiments of the present invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of the present invention. Furthermore, in the context, it should also be understood that when it is mentioned that one element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0045] like Figure 1 As shown, this embodiment of the invention provides a method for preparing inorganic plates using vaporized slag, comprising:

[0046] A mixture comprising vaporized slag, water, and a conductive agent is heated to a molten state and placed in a fiber-generating container. The mixture is then pressurized to a preset pressure under a protective gas atmosphere and heated to a preset temperature to obtain a molten mixture. The fiber-generating container is connected to multiple metal tubes made of a high-temperature alloy. Each metal tube is connected to a power source. A rotatable rotating disk is located at the end of each metal tube furthest from the fiber-generating container. The axis of the rotating disk is parallel to the axis of the metal tube. A pressure roller is positioned above the rotating disk, with the vertical projection of the roller's axial direction coinciding with the diameter of the rotating disk. The pressure roller presses against the rotating disk.

[0047] The mixture was kept at a preset temperature and pressure for a preset time, and the viscosity of the molten mixture was tested.

[0048] Once the preset viscosity is reached, the power is turned on to create a uniform electric field between the metal tube and the rotating disk 4. At the same time, the rotating disk rotates, receiving the fiber filaments output from the metal tube and rotating the received fiber filaments to the pressure roller to flatten them.

[0049] In this embodiment, vaporized slag, a conductive agent, and water are mixed to obtain a mixture. The conductive agent significantly increases the conductivity of the molten mixture, while the water disrupts the silicon-oxygen tetrahedral network of silica in the vaporized slag, greatly reducing the viscosity of the molten mixture. After obtaining the mixture, it is placed in a fiber-generating container 1. Under a protective gas atmosphere, the pressure in the fiber-generating container 1 is increased to a preset pressure, and then the temperature is raised to a preset temperature. For example, this can be achieved through high-temperature resistance heating or electromagnetic induction heating. At the preset pressure and temperature, the water in the mixture is in a supercritical state and dissolves into the molten mixture, thus disrupting the silicon-oxygen tetrahedron network. It should be noted that without high pressure, the water will escape from the molten mixture as steam, failing to effectively reduce the viscosity of the molten mixture. After being kept at high temperature and pressure for a preset time, allowing the water to fully dissolve and the viscosity to decrease to the preset level, power supply 3 is turned on, creating a uniform electric field between the metal tube 2 and the rotating disk. The molten mixture is then ejected from the metal tube 2. Under the action of the conductive agent, the molten mixture becomes charged. Under the influence of the electric field, the ejected molten mixture forms a Taylor cone, meaning the ejected liquid disperses into multiple micron or nanometer-sized fluids. Water evaporates during the fluid formation process. The micron- and nanometer-sized fluids have extremely small surface areas and cool very quickly, rapidly cooling and depressurizing during ejection to form solid fiber filaments, which are eventually collected on the rotating disk. The rotating disk continues to rotate, bringing the relatively loose fiber filaments collected on it to the pressure roller, where the roller compacts them.

[0050] By setting a preset pressure on the pressure roller, the roller can compact the fiber filaments without resulting in a fiberboard with excessively low porosity, which would affect its thermal insulation performance. Understandably, the preset pressure can be adjusted from high to low and then back to high again, resulting in a fiberboard with a dense exterior and high porosity in the center, thus balancing mechanical and thermal insulation properties.

[0051] In this embodiment, the metal tube 2 can be made of platinum-rhodium alloy or titanium alloy.

[0052] In some embodiments of the present invention, the pressure roller includes a roller body 41 and a rotating shaft 43. The roller body 41 is sleeved on the outside of the rotating shaft 43 and rotatably connected thereto. The rotating shaft 43 is fixedly connected to a connecting rod 42 perpendicular to the rotating disk. A pressure sensor is installed on the connecting rod 42 to collect the force in the vertical direction that the pressure roller receives.

[0053] The method also includes:

[0054] Adjust the connecting rod 42 vertically according to the pressure sensor reading to keep the pressure sensor reading within a preset range.

[0055] In this embodiment, the preset pressure can be a fixed value or a range. By setting a range, the pressure of the pressure roller can be safely adjusted within that range, thereby adjusting the structure of the resulting fiberboard. Specifically, by setting the preset pressure of the pressure roller, the roller can compact the fiber filaments without causing the porosity of the fiberboard to be too low, thus affecting the thermal insulation performance. It can be understood that the preset pressure can be adjusted from high to low and then back to high, resulting in a fiberboard with a dense exterior and high porosity in the middle, thus balancing mechanical and thermal insulation properties.

[0056] In some embodiments of the present invention, a thermal resistor is provided inside the pressure roller to heat the pressure roller to the pressing temperature.

[0057] In this embodiment, the pressure roller is heated to a high temperature using a thermal resistor. As the fibers are squeezed by the roller, they are also subjected to high temperature, which causes the fibers, already at a certain temperature, to be shaped and locally bonded, thus increasing the bonding strength. Of course, a glue spraying mechanism can also be used to further increase the bonding strength of the fibers.

[0058] The vaporized slag in the mixture is vaporized slag obtained after carbon removal and purification to obtain purified powder, and different purified powders are weighed according to a preset ratio. The carbon removal and purification steps include:

[0059] The gasification slag is sorted to obtain gasification slag groups with different particle size ranges;

[0060] Place different vaporized slag groups into a hot air sorting device; please refer to... Figure 2 The hot air sorting device includes multiple sorting units. Each sorting unit includes a hopper 201 and a sedimentation hopper 202 located below the hopper 201. The multiple hoppers 201 are used to hold different gasified slag groups. The bottom of the hopper 201 is provided with a strip-shaped connecting hole that connects the hopper 201 and the sedimentation hopper 202. Each sedimentation hopper 202 is provided with a gas supply pipe 203. The length of the strip-shaped gas outlet of the gas supply pipe 203 matches the length of the connecting hole.

[0061] High-temperature gas is supplied to the sedimentation chamber 202 through the gas supply pipe 203. The powder falling through the connecting hole is heated and decarbonized by the high-temperature gas and obtains an initial velocity under the action of aerodynamic force. Particles with different densities eventually fall into different areas at the bottom of the sedimentation chamber 202. Initial powder with different main components is collected at different positions at the bottom of each sedimentation chamber 202, and the main components in the initial powder are purified to obtain purified powder.

[0062] The powder is weighed from the purified powder according to the preset ratio, and the inorganic material is prepared after being mixed evenly.

[0063] In this application, to obtain high-quality inorganic materials, the various substances in the gasification slag need to be within a reasonable range. However, since the gasification slag is a mixture of multiple substances, it is difficult to precisely adjust the composition of each substance. Therefore, the obtained raw gasification slag needs to be processed. First, the gasification slag is separated into gasification slag groups with different particle size ranges using a sorting device such as a screen. The different gasification slag groups are placed in different silos 201. The connecting holes at the bottom of the silos 201 are relatively narrow, with a width that can be 1.2 to 2.5 times the maximum particle size of the gasification slag group. The gasification slag in the silos 201 falls into the sedimentation chamber 202 through the connecting holes, forming a planar solid flow during the falling process. The sedimentation chamber 202 is equipped with a gas delivery pipe 203, and the power source of the gas delivery pipe 203 is controlled to blow out a high-temperature laminar flow from its outlet. The high-temperature laminar flow comes into contact with the planar solid flow. Because the solid flow is relatively thin, after contact with the high-temperature laminar flow, the high temperature oxidizes the residual carbon in the gasification slag, completing the decarbonization. Simultaneously, the high-temperature laminar flow imparts an initial velocity to the planar solid flow, causing the particles to move along parabolic trajectories. The various oxides in the gasified slag, such as alumina, silica, calcium oxide, and iron oxide, have different densities but similar particle sizes; therefore, their masses differ, resulting in different lateral movement distances. In summary, particles of different compositions fall to the bottom of the sedimentation chamber 202 at different lateral distances, thus completing the decarbonization and preliminary sorting of the various oxides, yielding initial powders with different main components. After obtaining the initial powders, their main components are purified. Following decarbonization and preliminary sorting, the purification of the main components of the initial powders is more efficient and convenient. After purification, highly purified powder is obtained. This purified powder is weighed and mixed according to a reasonable preset ratio, and then the mixed powder, weighed and mixed according to the preset ratio, is used to prepare inorganic materials, resulting in high-quality inorganic materials.

[0064] In some embodiments of the present invention, before outputting high-temperature gas into the deposition chamber 202 via the gas transmission pipe 203, the method further includes:

[0065] The flow rate of the high-temperature gas output from the gas transmission pipeline 203 is determined based on the particle size range of the particles in the silo 201.

[0066] In this embodiment, since the particle size in the hopper 201 is different, the air speed can be adjusted according to the particle size to improve the sorting effect. The air speed cannot be too slow, otherwise the sorting effect will be poor; however, it cannot be too fast either, otherwise laminar flow cannot be formed.

[0067] In some embodiments of the present invention, multiple sorting units are stacked, the height of the hopper 201 is the same as the height of the sedimentation hopper 202, the hopper 201 is located above the side of the sedimentation hopper 202 of the same sorting unit where the gas supply pipe 203 is provided, the right-angle space formed by the hopper 201 and sedimentation hopper 202 of one sorting unit is spliced ​​to the sedimentation hopper 202 of another sorting unit, and the hoppers 201 of two adjacent sorting units are located in different directions.

[0068] In this embodiment, stacking multiple sorting units can save space. Since the longitudinal section of the sorting unit is L-shaped, the hoppers 201 of each sorting unit need to be set in different directions.

[0069] In some embodiments of the present invention, the main components in the initial powder are purified to obtain a purified powder, including:

[0070] The initial powder, whose main component is calcium oxide, is placed in water and filtered to obtain a first filtrate and a first filter residue.

[0071] The first filtrate is passed through carbon dioxide, and after a complete reaction, calcium carbonate precipitate is obtained.

[0072] After filtering out the calcium carbonate precipitate and calcining it, purified calcium oxide powder is obtained.

[0073] The content of calcium oxide in the original gasification slag is not high, and rapid purification requires multiple washings and dissolutions with large amounts of water. In this embodiment, however, a high-calcium oxide content initial powder can be obtained after preliminary selection. The initial powder is then mixed with water. Due to the high calcium oxide content in the initial powder, the water can quickly and extensively dissolve and saturate the calcium oxide, thus purifying the calcium oxide through subsequent steps.

[0074] In some embodiments of the present invention, the main components in the initial powder are purified to obtain a purified powder, including:

[0075] The initial powder, whose main component is silicon dioxide, is placed in water and filtered to obtain a second filter residue.

[0076] The first and second filter residues were added to concentrated hydrochloric acid and heated until fully dissolved to obtain silica precipitate and second filtrate. The silica purified powder was obtained by filtration.

[0077] In this embodiment, the first filter residue after calcium oxide purification mainly consists of oxides of silicon, aluminum, and iron. The second filter residue, after calcium oxide removal by rinsing with running water, is mixed with the first filter residue. Of course, the filtrate after rinsing can also be used for precipitation-calcination purification of calcium oxide. Both the first and second filter residues mainly consist of oxides of silicon, aluminum, and iron. After mixing, concentrated hydrochloric acid is added and the mixture is heated to dissolve the aluminum oxide, yielding a silica precipitate and a second filtrate.

[0078] In some embodiments of the present invention, the main components in the initial powder are purified to obtain a purified powder, including:

[0079] The two groups of initial powders, whose main components are aluminum oxide and iron oxide, are placed in water and filtered to obtain the third filter residue.

[0080] The third filter residue was added to concentrated hydrochloric acid and heated until fully dissolved to obtain silica precipitate and third filtrate. The silica purified powder was obtained by filtration.

[0081] After adjusting the pH of the third filtrate and the second filtrate to neutral, an excess of alkaline solution was added, and after the reaction was complete, ferric hydroxide precipitate was obtained.

[0082] After filtration, ferric hydroxide precipitate and filtrate are obtained. Carbon dioxide is passed into the filtrate to obtain aluminum hydroxide precipitate.

[0083] After calcining aluminum hydroxide precipitate and iron hydroxide precipitate respectively, purified alumina powder and purified iron oxide powder were obtained.

[0084] A primary powder, mainly composed of aluminum oxide and iron oxide, is placed in water and filtered to obtain a third filter residue. This residue is then subjected to heating with concentrated hydrochloric acid to obtain silica precipitate and a third filtrate. The second and third filtrates, both containing dissolved aluminum chloride and iron chloride, are adjusted to neutral pH, and excess sodium hydroxide is added to obtain iron hydroxide precipitate, which is then calcined to obtain iron oxide. Aluminum chloride in the filtrate reacts with sodium hydroxide to form NaAlO2. After filtering off the iron hydroxide precipitate, carbon dioxide is bubbled into the solution to obtain aluminum hydroxide precipitate, which is then calcined to obtain aluminum oxide.

[0085] It should be noted that sequential purification can yield high-purity purified products. In this process, some oxides are purified multiple times, further improving the purity of the purified product.

[0086] In some embodiments of the present invention, the fiber generating container 1 is connected to an air pump via a gas pipe 6, and the fiber generating container 1 is connected to multiple metal tubes 2 via a high-temperature and high-pressure valve 5.

[0087] The fiber generating container 1 is located inside the enclosed space 100, which is connected to the outside through the pressure regulating pipe 7 and the cooling pipe 8.

[0088] After reaching the preset viscosity, it also includes:

[0089] The air pressure within the enclosed space 100 is adjusted by the pressure regulating pipe 7 to control the rate at which the fluid is output from the metal pipe 2.

[0090] The temperature inside the enclosed space 100 is reduced by cooling pipe 8.

[0091] In this embodiment, a protective gas can be introduced into the fiber generating container 1 through the gas pipeline 6, and the pressure can be increased by a compression device such as an air pump or a compressor pump. During the heat preservation stage, fluid cannot be output through the metal tube 2. 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. The high-temperature and high-pressure valve 5 can be opened to output fluid after the preset viscosity is met. After the valve is opened, the high pressure in the fiber generating container 1 becomes the driving force for the fluid to be ejected. The metal tubes 2 are located on the same plane and are in the liquid. They receive the same pressure, the jet pressure is the same, and the outgoing flow velocity is the same. Therefore, uniform and stable fibers can be obtained.

[0092] It should be noted that the pressure regulating pipe 7 and the cooling pipe 8 can be the same pipe, using a compressed cooling medium, such as dry ice or liquid nitrogen, to pressurize and cool the enclosed space 100. A pressure relief valve can be installed in the enclosed space 100 to prevent excessive pressure from the cooling medium due to thermal expansion.

[0093] 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 the pressure regulating pipe 7; in order to cool down quickly and dissipate heat, a cooling working fluid can be transported into the closed space 100 by the cooling pipe 8.

[0094] In some embodiments of the present invention, testing the viscosity of the molten mixture includes: testing the viscosity of the molten mixture using the ultrasonic pulse echo method.

[0095] In some embodiments of the present invention, the voltage applied by the power supply 3 is 20-40kV, the rotation speed of the rotating disk 4 is 500-2500rpm, and the spacing between the metal tubes 2 is 2-5cm.

[0096] In some embodiments of the present invention, the preset temperature is 900-1000°C and the preset pressure is 22-30 MPa.

[0097] 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 in the range of 22–30 MPa, which can bring the water to a supercritical state and allow it to dissolve in the molten mixture. If the pressure is below 22 MPa, the water cannot dissolve in the molten mixture. If the pressure is above 30 MPa, the pressure is too high, and instead of further improving the fluidity of the molten mixture due to the increased pressure, it will reduce the fluidity due to the excessive pressure.

[0098] In some embodiments of the present invention, the preset time is 1 to 3 hours.

[0099] In some embodiments of the present invention, the water content in the mixture is 4-8% by mass.

[0100] In this embodiment, if the water content is less than 4% by mass, its effect on viscosity and temperature is not significant, and the silicon-oxygen tetrahedral network cannot be sufficiently disrupted, resulting in insufficient viscosity and failure to obtain high-quality fibers. If the water content exceeds 8% by mass, the excessive water content will generate too much volatile matter during the jetting process, causing jetting interruptions.

[0101] In some embodiments of the present invention, the conductive agent includes sodium oxide and / or potassium oxide, and the conductive agent accounts for 0.1 to 0.2% by mass in the mixture.

[0102] In this embodiment, if the mass fraction of the conductive agent is less than 0.1%, the conductivity of the molten mixture decreases, 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 fibers in the molten mixture decreases.

[0103] This invention also provides an inorganic fiber prepared according to any of the methods described above.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing inorganic slabs from gasified slag, characterized in that, include: A mixture comprising vaporized slag, water, and a conductive agent is heated to a molten state and placed in a fiber-generating container. The mixture is then pressurized to a preset pressure under a protective gas atmosphere and heated to a preset temperature to obtain a molten mixture. The fiber-generating container is connected to multiple metal tubes made of a high-temperature alloy. Each metal tube is connected to a power source. A rotatable rotating disk is located at the end of each metal tube furthest from the fiber-generating container. The axis of the rotating disk is parallel to the axis of the metal tube. A pressure roller is positioned above the rotating disk, with the vertical projection of the roller's axial direction coinciding with the diameter of the rotating disk. The pressure roller presses against the rotating disk. The mixture is kept at the preset temperature and pressure for a preset time, and the viscosity of the molten mixture is tested. Once the preset viscosity is reached, the power supply is turned on to form a uniform electric field between the metal tube and the rotating disk. At the same time, the rotating disk rotates, receives the fiber filaments output from the metal tube, and rotates the received fiber filaments to the pressure roller to flatten them.

2. The method of claim 1, wherein, The pressure roller includes a roller body and a rotating shaft. The roller body is sleeved on the outside of the rotating shaft and rotatably connected to it. The rotating shaft is fixedly connected to a connecting rod perpendicular to the rotating disk. A pressure sensor is installed on the connecting rod to collect the vertical force on the pressure roller. The method further includes: Adjust the connecting rod vertically according to the pressure sensor reading to keep the pressure sensor reading within a preset range.

3. The method of claim 1, wherein, The pressure roller is equipped with a thermal resistor inside to heat the pressure roller to the pressing temperature.

4. The method of claim 1, wherein, The vaporized slag in the mixture is obtained by decarbonization and purification to obtain purified powder, and different purified powders are weighed according to a preset ratio. The decarbonization and purification steps include: The gasification slag is sorted to obtain gasification slag groups with different particle size ranges; Different vaporized slag groups are placed in a hot air sorting device; wherein, the hot air sorting device includes multiple sorting units, each sorting unit includes a hopper and a sedimentation hopper located below the hopper, the multiple hoppers are respectively used to hold different vaporized slag groups, the bottom of the hopper is provided with a strip-shaped connecting hole, the connecting hole connects the hopper and the sedimentation hopper, each sedimentation hopper is provided with a gas supply pipe, the length of the strip-shaped gas outlet of the gas supply pipe matches the length of the connecting hole; High-temperature gas is supplied to the deposition chamber through the gas pipeline, causing the powder falling through the connecting hole to be heated and decarbonized by the high-temperature gas. Under the action of aerodynamic force, the powder gains an initial velocity, causing particles of different densities to eventually fall into different areas at the bottom of the deposition chamber. Initially separated powders with different main components are collected at different positions at the bottom of each deposition chamber, and the main components in the initial separated powders are purified to obtain the purified powder.

5. The method of claim 4, wherein, Before supplying high-temperature gas into the deposition chamber via the gas pipeline, the method further includes: The flow rate of the high-temperature gas output from the gas delivery pipeline is determined based on the particle size range of the particles in the silo.

6. The method of claim 5, wherein, Multiple sorting units are stacked together. The height of the hopper and the height of the sedimentation hopper are the same. The hopper is located above the sedimentation hopper of the same sorting unit on the side where the gas pipeline is located. The right-angle space formed by the hopper and the sedimentation hopper of one sorting unit is connected to the sedimentation hopper of another sorting unit. The hoppers of two adjacent sorting units are located in different directions.

7. The method of claim 1, wherein, The voltage applied by the power source is 20~40kV, the rotation speed of the rotating disk is 500~2500rpm, and the spacing between the metal tubes is 2~5cm.

8. The method of claim 1, wherein, The preset pressure is 22~30 MPa.

9. The method of claim 1, wherein, The preset temperature is 900~1000℃, and the preset pressure is 22~30Mpa.

10. The method of claim 1, wherein, The water content is 4-8% by mass.

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