Red mud-based hollow glass microsphere preparation device

Abstract

The utility model relates to a red mud-based hollow glass microsphere preparation device, which comprises: a batching device, which comprises a red mud storage bin, a composite blending material storage bin, a belt constant feeder and a stirrer; the vitrification device is positioned at the tail end of the stirrer and comprises a glass tank furnace, a water quenching tank and a rotary screen; the powder making device is located at the tail end of the rotary screen and comprises a grinding device, a cyclone dust collector, a cloth bag type dust collector and a frit powder storage bin; and the expansion furnace is connected with the frit powder storage bin and is used for receiving the frit powder and expanding the frit powder into hollow glass microspheres at high temperature. According to the device, the characteristics that the red mud contains silicate components and alkali and is easy to vitrify are fully utilized, the red mud is used for preparing the red mud-based hollow glass microsphere material, the red mud-based hollow glass microsphere material can be widely applied to the fields of fireproof heat preservation plates, coatings, heat preservation mortar and the like, and high-valued, full-quantized and resource utilization of the red mud is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of red mud powder, in particular to a preparation device for red mud-based hollow glass microspheres. Background Art

[0002] The statements in this part are only to provide background information related to the technical solution of the present application for the purpose of helping understanding, and they do not necessarily constitute the prior art for the technical solution of the present application.

[0003] China is the largest alumina producer in the world, with an output of 82.38 million tons in 2023, accounting for 58% of the world's annual output. Red mud is the solid industrial waste obtained from extracting alumina from bauxite. In 2023, the red mud production in China was 107 million tons, and the comprehensive utilization volume was 10.5 million tons, accounting for 10% of the new increment, far lower than the comprehensive utilization level of other solid wastes. At present, five major application fields such as element extraction, powder materials, cementitious materials, road materials, and building ceramic materials have been basically formed. The comprehensive utilization of red mud is a world problem, but it is a problem that is expected to be overcome. Minimizing and reducing the harm of red mud, effectively using red mud to make it reduced, harmless, resourceful, high-value, and industrialized, turning waste into treasure, is the only way for the alumina industry to achieve green transformation and high-quality development.

[0004] Hollow glass microspheres are smooth-surfaced hollow glass spheres, mainly composed of silicate glass, and are hollow spheres. The hollow spherical structure endows hollow glass microspheres with advantages such as low density, high strength, low thermal conductivity, corrosion resistance, insulation, dispersibility, fluidity, and good stability. It can reduce the material density and viscosity, reduce the curing shrinkage stress, reduce the thermal conductivity coefficient, improve the heat insulation and heat preservation performance, and improve the impact resistance, etc. The main raw materials of hollow glass microspheres are industrial raw materials such as quartz, alumina, and soda ash. Since red mud contains silicate components and has a fine particle size and soft texture, it will become the main raw material for hollow glass microspheres. At present, there is no technology and device for preparing hollow glass microspheres from red mud. Content of the Utility Model

[0005] In order to achieve the purpose of preparing hollow glass microspheres from red mud, the utility model provides a preparation device for red mud-based hollow glass microspheres, which can use red mud as the main raw material to prepare hollow glass microspheres, thereby realizing the high-value utilization of red mud.

[0006] One aspect of the utility model relates to a preparation device for red mud-based hollow glass microspheres, which is characterized in that the device includes:

[0007] A batching device, which includes a red mud storage bin, a composite admixture storage bin, a belt weighing feeder for transporting red mud and composite admixture, and a mixer for stirring the red mud and composite admixture transported by the belt weighing feeder;

[0008] A vitrification device located at the end of a mixer, which includes a glass tank furnace for making molten material liquid from red mud and composite admixtures from the mixer, a water quenching tank for cooling the molten material liquid and cracking it into frit particles, and a rotary screen for dehydrating the frit particles;

[0009] A powder making device located at the end of the rotary screen, which includes a grinding device for grinding the frit particles into frit powder, a cyclone dust collector, a bag type dust collector, and a frit powder storage bin for receiving the frit powder from the cyclone dust collector;

[0010] An expansion furnace connected to the frit powder storage bin, which is used to receive the frit powder from the frit powder storage bin and make it expand at high temperature into hollow glass microspheres.

[0011] In one embodiment, the red mud-based hollow glass microsphere preparation device further includes: a hollow glass microsphere storage bin provided at the end of the expansion furnace.

[0012] In one embodiment, the red mud-based hollow glass microsphere preparation device further includes: an automatic packaging machine provided below the hollow glass microsphere storage bin, which is used to package the hollow glass microspheres into finished products.

[0013] In one embodiment, the glass tank furnace has a device for regulating the melting temperature and heating-up time and a temperature sensor for monitoring the melting temperature.

[0014] In one embodiment, the mixer is a ribbon mixer equipped with spiral stirring blades.

[0015] In one embodiment, the water quenching tank has a device for regulating the water temperature and water flow rate, a temperature sensor for monitoring the water temperature, and a flow sensor for monitoring the water flow rate.

[0016] In one embodiment, the rotary screen is a screening device with adjustable rotation speed.

[0017] In one embodiment, the grinding device is a Raymond mill.

[0018] In one embodiment, the cyclone dust collector is used to perform cyclone separation on the frit powder obtained by grinding with the grinding device, and the particle size of the frit powder discharged from the outlet of the cyclone dust collector is -800 mesh > 95%.

[0019] In one embodiment, the expansion furnace has a device for regulating the foaming temperature and heating-up time and a temperature sensor for monitoring the foaming temperature.

[0020] The beneficial effects of the present utility model are as follows: Through the red mud-based hollow glass microsphere preparation device, red mud and composite admixtures are fed into a mixer for uniform mixing, and then fed into a glass tank furnace for high-temperature melting. The red mud and composite admixtures undergo solid-phase reactions and are melted into a liquid molten material. The molten material then quickly flows into a water quenching tank and is instantaneously quenched to achieve non-crystallization, and at the same time, it explodes into particles to obtain frit particles. The frit particles are dehydrated in a rotary screen and then fed into a grinding device for grinding and classification to obtain frit powder with a uniform particle size distribution. The frit powder is fed into an expansion furnace. Under the action of high temperature, when the frit powder approaches the melting temperature, its viscosity decreases. At the same time, the water that fails to dissipate in time during non-crystallization and the oxides in the frit powder decompose to generate gas, causing pressure inside the frit powder and making the frit powder expand to obtain the finished product of red mud-based hollow glass microspheres. The red mud-based hollow glass microsphere preparation device of the present utility model makes full use of the characteristics of red mud containing silicate components, alkali, and being easy to vitrify, prepares red mud-based hollow glass microsphere materials, which can be widely used in fields such as fireproof insulation boards, coatings, and thermal insulation mortars, realizing the high-value, full-quantity, and resource utilization of red mud. Description of the Drawings

[0021] The following further describes the embodiments of the present utility model with reference to the drawings, where:

[0022] Figure 1 is a schematic structural diagram of a red mud-based hollow glass microsphere preparation device according to an embodiment;

[0023] Figure 2 is a flow chart of a red mud-based hollow glass microsphere preparation process according to an embodiment.

[0024] In the figure, 1 - batching device, 1-1 - red mud storage bin, 1-2 - composite admixture storage bin, 1-3 - belt weighing feeder, 1-4 - mixer, 2 - vitrification device, 2-1 - glass tank furnace, 2-2 - water quenching tank, 2-3 - rotary screen, 3 - powder making device, 3-1 - grinding device, 3-2 - cyclone dust collector, 3-3 - bag filter, 3-4 - frit powder storage bin, 4 - expansion furnace, 5 - hollow glass microsphere storage bin, 6 - automatic packaging machine. Detailed Embodiments

[0025] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following further details the present utility model through specific embodiments with reference to the drawings. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0026] As Figure 1 shown, a red mud-based hollow glass microsphere preparation device according to an embodiment includes:

[0027] The batching device 1 includes a red mud storage bin 1-1, a composite admixture storage bin 1-2, a belt weighing feeder 1-3, and a mixer 1-4. The belt weighing feeder 1-3 is used to convey the red mud and the composite admixture from the red mud storage bin 1-1 and the composite admixture storage bin 1-2 respectively to the mixer 1-4. The mixer 1-4 is used to stir the red mud and the composite admixture conveyed by the belt weighing feeder 1-3 to make them evenly mixed.

[0028] The vitrification device 2 located at the end of the mixer 1-4 includes a glass tank furnace 2-1, a water quenching tank 2-2, and a rotary screen 2-3. The glass tank furnace 2-1 is used to make the red mud and the composite admixture from the mixer 1-4 into a molten feed liquid. The water quenching tank 2-2 is used to quickly cool down the molten feed liquid and break it into molten block particles. The rotary screen 2-3 is used to dehydrate the molten block particles. In one embodiment, the rotary screen 2-3 is also used to screen the particle size of the molten block particles.

[0029] The powder making device 3 located at the end of the rotary screen 2-3 includes a grinding device 3-1, a cyclone dust collector 3-2, a bag filter 3-3, and a molten block powder storage bin 3-4. The grinding device 3-1 is used to grind the molten block particles from the rotary screen 2-3 into molten block powder. The molten block powder storage bin 3-4 is used to receive the molten block powder from the cyclone dust collector 3-2.

[0030] The expansion furnace 4 connected to the molten block powder storage bin 3-4 is used to receive the molten block powder from the molten block powder storage bin 3-4 and make it expand at high temperature into hollow glass microspheres.

[0031] In one embodiment, a hollow glass microsphere storage bin 5 is further provided at the end of the expansion furnace 4.

[0032] In one embodiment, an automatic packaging machine 6 is further provided below the hollow glass microsphere storage bin 5, which is used to package the hollow glass microspheres into finished products.

[0033] In one embodiment, the glass tank furnace 2-1 has a device for regulating the melting temperature and the heating-up time. The melting temperature range can be, for example, 950°C - 1500°C. In one embodiment, a temperature sensor is provided in the glass tank furnace 2-1 for monitoring the melting temperature.

[0034] In one embodiment, the mixer 1-4 is a ribbon mixer equipped with spiral stirring blades.

[0035] In one embodiment, the water quenching tank 2-2 is provided with a device for regulating the water temperature and water flow rate. The water quenching tank 2-2 is used to instantaneously cool the molten material liquid from the glass tank furnace 2-1 to achieve non-crystallization, and at the same time, make it burst into particles to obtain frit particles. In one embodiment, a temperature sensor for monitoring the water temperature and a flow sensor for monitoring the water flow rate are arranged in the water quenching tank 2-2.

[0036] In one embodiment, the rotary screen 2-3 is a screening device with adjustable rotation speed, which is used to dehydrate the frit particles from the water quenching tank 2-2.

[0037] In one embodiment, the grinding device 3-1 is a Raymond mill, which is used to grind the frit particles into powder to obtain frit powder.

[0038] In one embodiment, the cyclone dust collector 3-2 is used to perform cyclone separation on the frit powder obtained by grinding with the grinding device 3-1. The particle size of the frit powder discharged from the discharge port of the cyclone dust collector 3-2 is -800 mesh > 95%;

[0039] In one embodiment, the expansion furnace 4 is provided with a device for regulating the foaming temperature and heating-up time, and the foaming temperature range can be, for example, 900°C - 1200°C. The expansion furnace 4 is used to perform high-temperature foaming on the frit powder with a particle size of -800 mesh > 95% to obtain red mud-based hollow glass microspheres. In one embodiment, a temperature sensor is arranged in the expansion furnace 4 for monitoring the foaming temperature.

[0040] In one embodiment, the composite admixture storage bin 1-2 is used to store the composite admixture, and the composite admixture and red mud are conveyed to the mixer 1-4 by a belt weighing feeder 1-3. In one embodiment, the addition amount of the composite admixture can be 30% - 100% of the weight of the red mud. In one embodiment, the composite admixture can include any one or a mixture of any several of waste glass powder, quartz sand powder, sodium nitrate, sodium sulfate, borax, boric acid, sodium chloride.

[0041] Figure 2 The flowchart of the preparation process of red mud-based hollow glass microspheres according to one embodiment is shown. The device provided by the present invention is used for the preparation of red mud-based hollow glass microspheres, including the following steps:

[0042] (1) Send red mud with a water content < 2% and a composite admixture (such as a mixture of one or several of waste glass powder, quartz sand powder, sodium nitrate, sodium sulfate, borax, boric acid, sodium chloride, and the addition amount of the composite admixture can be 30% - 100% of the weight of the red mud) into the stirrer through a belt weighing feeder for uniform mixing.

[0043] (2) Feed the mixed red mud and composite admixture into a glass tank furnace. Under the action of high temperature of 950°C - 1500°C, the red mud and the composite admixture undergo solid-phase reaction and melt into a liquid state to obtain a molten feed liquid.

[0044] (3) The molten feed liquid flows into a water quenching tank and is instantaneously quenched to achieve non-crystallization. At the same time, it explodes into particles to obtain frit particles.

[0045] (4) After the frit particles are dehydrated by a rotary sieve, they are fed into a grinding device to obtain frit powder with a particle size of >95% - 800 mesh.

[0046] (5) Feed the frit powder into an expansion furnace. Under the action of high temperature of 900°C - 1200°C, when the frit powder approaches the melting temperature, its viscosity decreases. At the same time, the water that fails to dissipate in time during non-crystallization and the oxides in the frit powder decompose to generate gas, causing pressure inside the frit powder and making the frit powder expand to obtain red mud-based hollow glass microspheres.

[0047] References herein to "each embodiment", "some embodiments", "an embodiment", or "embodiments", etc. refer to specific features, structures, or properties described in connection with the embodiments being included in at least one embodiment. Thus, the appearances of the phrases "in each embodiment", "in some embodiments", "in an embodiment", or "in embodiments", etc. throughout this document are not necessarily referring to the same embodiment. Additionally, the specific features, structures, or properties may be combined in any suitable manner in one or more embodiments. Accordingly, the specific features, structures, or properties shown or described in connection with one embodiment may be combined with the features, structures, or properties of one or more other embodiments, in whole or in part, without limitation, as long as the combination is not illogical or non-functional. Expressions such as "according to A", "based on A", "by A", or "using A" that appear in this document are meant to be non-exclusive. That is, "according to A" may cover "only according to A", or may also cover "according to A and B", unless specifically stated to mean "only according to A". In this application, for the sake of clear description, some illustrative operation steps are described in a certain order, but those skilled in the art can understand that each of these operation steps is not essential, and some of these steps can be omitted or replaced by other steps. These operation steps do not have to be executed in the order shown. Instead, some of these operation steps can be executed in a different order according to actual needs, or executed in parallel, as long as the new execution method is not illogical or non-functional.

[0048] Thus, several aspects of at least one embodiment of the present utility model are described. It can be understood that various changes, modifications, and improvements can be easily made by those skilled in the art. Such changes, modifications, and improvements are intended to be within the spirit and scope of the present utility model. Although the present utility model has been described through some embodiments, the present utility model is not limited to the embodiments described herein, and various changes and variations made without departing from the scope of the present utility model are also included.

Claims

1. A preparation device for red mud-based hollow glass microspheres, characterized in that, The device comprises: a batching device (1), which includes a red mud storage bin (1-1), a composite admixture storage bin (1-2), a belt batcher (1-3) for conveying red mud and composite admixture, and a mixer (1-4) for mixing the red mud and composite admixture conveyed by the belt batcher (1-3); a vitrification device (2) located at the end of the mixer (1-4), which includes a glass tank furnace (2-1) for making the red mud and composite admixture from the mixer (1-4) into a molten liquid, a water quenching tank (2-2) for cooling the molten liquid and bursting it into molten block particles, and a rotary screen (2-3) for dehydrating the molten block particles; a powder making device (3) located at the end of the rotary screen (2-3), which includes a grinding device (3-1) for grinding the molten block particles into molten block powder, a cyclone dust collector (3-2), a bag type dust collector (3-3), and a molten block powder storage bin (3-4) for receiving the molten block powder from the cyclone dust collector (3-2); an expansion furnace (4) connected to the molten block powder storage bin (3-4), which is used to receive the molten block powder from the molten block powder storage bin (3-4) and make it expand at high temperature into hollow glass microspheres.

2. The preparation device of the red mud-based hollow glass microspheres according to claim 1, wherein, It further comprises: a hollow glass microsphere storage bin (5) arranged at the end of the expansion furnace (4).

3. The preparation device of red mud-based hollow glass microspheres according to claim 2, characterized in that, It further comprises: an automatic packaging machine (6) arranged below the hollow glass microsphere storage bin (5), which is used to package the hollow glass microspheres into finished products.

4. The red mud-based hollow glass microsphere preparation device according to claim 1, wherein, The glass tank furnace (2-1) is provided with a device for regulating the melting temperature and heating-up time and a temperature sensor for monitoring the melting temperature.

5. The device for preparing red mud-based hollow glass microspheres according to claim 1, wherein, The mixer (1-4) is a spiral ribbon mixer equipped with spiral mixing blades.

6. The device for preparing red mud-based hollow glass microspheres according to claim 1, wherein, The water quenching tank (2-2) is provided with a device for regulating the water temperature and water flow rate, a temperature sensor for monitoring the water temperature, and a flow sensor for monitoring the water flow rate.

Images