Device for preparing honeycomb material by using red mud

Abstract

The utility model relates to a device for preparing a honeycomb material by using red mud, which comprises a red mud powder storage bin and a composite sintering aid powder storage bin which are respectively used for storing red mud powder and composite sintering aid powder; the mixing device is used for mixing the red mud powder from the red mud powder storage bin and the composite sintering aid powder from the composite sintering aid powder storage bin; the green body forming device is used for manufacturing the mixed powder into a honeycomb material green body, and the green body forming device comprises a first hydraulic cylinder, an upper mold, a lower mold below the upper mold, second hydraulic cylinders on the two sides of the lower mold, a third hydraulic cylinder installed on the inner wall of the green body forming device and a quantitative distributing device above the third hydraulic cylinder; the roller way conveyor is positioned between the green body forming device and the sintering device and is used for conveying the honeycomb material green body to the sintering device; and the sintering device is positioned at the tail end of the roller conveyor and is used for sintering the honeycomb material green body into a honeycomb material finished product.

Description

Technical Field

[0001] The utility model relates to the technical field of solid waste utilization, in particular to a device for preparing honeycomb materials by using red mud. Background Art

[0002] The statements in this section are merely intended to provide background information related to the technical solution of the present application to aid understanding, and they do not necessarily constitute prior art for the technical solution of the present application.

[0003] Red mud is a major solid waste generated in the alumina production process. Generally, 1-1.5 tons of red mud are generated for every ton of alumina produced. Due to the alkaline content, fine particles and complex composition of red mud, the comprehensive utilization of red mud has always been a common problem in the green development of the global aluminum industry. At present, the comprehensive utilization rate of red mud is less than 10%, and the main treatment method is open-air storage, which is easy to have a negative impact on the ecological environment and seriously restricts the sustainable development of the alumina industry.

[0004] At present, the comprehensive utilization of red mud mainly includes the following methods: iron selection from red mud, cement admixture, roadbed materials, etc. Because red mud contains alkali and is produced in large quantities, its large-scale and high-value utilization is restricted.

[0005] Sintered honeycomb materials have interconnected channels and can provide good filtering performance. The raw materials mainly use natural minerals such as kaolin, talc, aluminum powder, diatomaceous earth, zeolite and organic pore-forming agents. The sintering temperature is high and the production cost is high. Honeycomb materials have a very wide range of uses. If red mud can be used to prepare high-performance sintered honeycomb materials, the high-value utilization of red mud will be achieved. However, there is currently no technology or equipment for preparing sintered honeycomb materials from red mud. Utility Model Content

[0006] In order to achieve the purpose of using red mud to prepare honeycomb materials, the utility model provides a device for preparing honeycomb materials using red mud. High-performance sintered honeycomb materials can be prepared using red mud, which has good filtering performance and realizes high-value utilization of red mud.

[0007] One aspect of the utility model relates to a device for preparing honeycomb material using red mud, comprising:

[0008] The red mud powder storage bin and the composite sintering aid powder storage bin are used to store the red mud powder and the composite sintering aid powder respectively;

[0009] A mixing device, used for mixing the red mud powder from the red mud powder storage bin and the composite sintering aid powder from the composite sintering aid powder storage bin;

[0010] A body forming device is used to form a honeycomb material body from the mixed powder, the body forming device comprising a first hydraulic cylinder, an upper mold, a lower mold below the upper mold, second hydraulic cylinders on both sides of the lower mold, a third hydraulic cylinder installed on the inner wall of the body forming device, and a quantitative distributor above the third hydraulic cylinder;

[0011] A roller conveyor, located between the green body forming device and the sintering device, for conveying the honeycomb material green body to the sintering device; and

[0012] The sintering device is located at the end of the roller conveyor and is used for sintering the honeycomb material green body into a honeycomb material finished product.

[0013] In one embodiment, the device also includes: a mixed powder storage bin located between the mixing device and the blank forming device, for temporarily storing the mixed powder from the mixing device; and a powder flow control valve located between the mixed powder storage bin and the blank forming device, for controlling the flow of the mixed powder.

[0014] In one embodiment, the device further comprises: a first belt quantitative feeder, located above the mixing device, for quantitatively conveying red mud powder and composite sintering aid powder to the mixing device.

[0015] In one embodiment, the device also includes: a first ball mill and a second ball mill, which are respectively located above the composite sintering aid powder storage bin and the red mud powder storage bin, and are used to grind the composite sintering aid and grind the red mud, respectively; a second belt quantitative feeder, which is located above the first ball mill and the second ball mill, and is used to quantitatively transport red mud and the composite sintering aid to the first ball mill and the second ball mill; and, a composite sintering aid storage bin and a red mud storage bin, which are located above the second belt quantitative feeder, and are used to store the composite sintering aid and red mud, respectively.

[0016] In one embodiment, the first hydraulic cylinder of the blank forming device is connected to the upper mold, and the upper mold is used to press the hexagonal honeycomb wall into the hexagonal honeycomb wall groove of the lower mold under the downward action of the first hydraulic cylinder to form the mixed powder.

[0017] In one embodiment, the cross-section of the upper mold is a uniformly distributed hexagonal honeycomb wall structure, and the cross-section of the lower mold is a uniformly distributed hexagonal honeycomb wall groove structure.

[0018] In one embodiment, the discharge particle size of the first ball mill is -200 mesh>75%.

[0019] In one embodiment, the discharge particle size of the second ball mill is -325 mesh>90%.

[0020] In one embodiment, the mixing device is a V-shaped mixer capable of adjusting mixing time and mixing speed.

[0021] In one embodiment, the sintering device is a roller kiln capable of regulating the temperature and heating time of each temperature zone.

[0022] The beneficial effects obtained by one or more embodiments of the utility model include: through the device, after grinding red mud and composite sintering aids, they are uniformly mixed to obtain a mixed powder with a certain particle size gradient distribution, which is formed into a honeycomb material blank in a forming device, and the blank is sintered at high temperature in a roller kiln, and the alkali in the red mud and part of the composite sintering aids generate a liquid phase product with high viscosity, which wraps and bonds the remaining composite sintering aids, and the organic flocculant component in the red mud acts as a good pore-forming agent. Under the combined action of particle accumulation and cooling shrinkage, the organic flocculant component in the red mud is cooled by the cooling belt to form a sintered honeycomb material with developed interconnected channels in the honeycomb wall, and the honeycomb material has high apparent porosity, excellent filtration, heat storage performance, and high specific surface area. The device utilizes the inherent characteristics of red mud containing alkali and organic flocculants to prepare a sintered honeycomb material with excellent filtration performance, which can be applied to flue gas purification, waste gas treatment, sewage treatment and other fields, and realizes the high value, full quantification and resource utilization of red mud. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following is a further description of the embodiments of the present invention with reference to the accompanying drawings, wherein:

[0024] Figure 1 A schematic structural diagram of a device for preparing a honeycomb material using red mud according to an embodiment is shown;

[0025] Figure 2 A schematic cross-sectional view of an upper mold according to an embodiment is shown;

[0026] Figure 3 A cross-sectional schematic diagram of a lower mold according to one embodiment is shown;

[0027] Figure 4 A schematic structural diagram of an apparatus for preparing a honeycomb material using red mud according to another embodiment is shown;

[0028] Figure 5 A simplified process flow diagram of preparing honeycomb materials using red mud according to one embodiment is shown.

[0029] In the figure, 1 is a green body forming device, 1-1 is a first hydraulic cylinder, 1-2 is an upper mold, 1-3 is a second hydraulic cylinder, 1-4 is a lower mold, 1-5 is a third hydraulic cylinder, 1-6 is a quantitative distributor, 2 is a powder flow control valve, 3 is a mixed powder storage bin, 4 is a V-type mixer, 5 is a first belt quantitative feeder, 6 is a composite sintering aid powder storage bin, 7 is a first ball mill, 8 is a second belt quantitative feeder, 9 is a composite sintering aid storage bin, 10 is a red mud storage bin, 11 is a second ball mill, 12 is a red mud powder storage bin, 13 is a roller conveyor, and 14 is a sintering device. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0031] Figure 1 The structure diagram of a device for preparing honeycomb material using red mud according to one embodiment is shown. It should be noted that: Figure 1 The various components shown in the figure are only used to illustrate the embodiment, and it does not mean that each component is necessary for the solution. The device includes:

[0032] The red mud powder storage bin 12 and the composite sintering aid powder storage bin 6 are used to store the red mud powder and the composite sintering aid powder respectively;

[0033] A mixing device 4, used for mixing the red mud powder from the red mud powder storage bin 12 and the composite sintering aid powder from the composite sintering aid powder storage bin 6;

[0034] A body forming device 1 is used to form a honeycomb material body from the mixed powder, the body forming device 1 comprising a first hydraulic cylinder 1-1, an upper mold 1-2, a lower mold 1-4 below the upper mold, second hydraulic cylinders 1-3 on both sides of the lower mold, a third hydraulic cylinder 1-5 installed on the inner wall of the body forming device 1, and a quantitative distributor 1-6 above the third hydraulic cylinder;

[0035] A roller conveyor 13, located between the green body forming device 1 and the sintering device 14, for conveying the honeycomb material green body to the sintering device 14; and

[0036] The sintering device 14 is located at the end of the roller conveyor 13 and is used to sinter the honeycomb material green body into a honeycomb material finished product.

[0037] In one embodiment, the apparatus for preparing honeycomb materials using red mud may further include a mixed powder storage bin 3 located between the mixing device 4 and the green body forming device 1, for temporarily storing the mixed powder from the mixing device 4. In one embodiment, the apparatus for preparing honeycomb materials using red mud may further include a powder flow control valve 2 located between the mixed powder storage bin 3 and the green body forming device 1, for controlling the flow of the mixed powder.

[0038] In one embodiment, the apparatus for preparing honeycomb material using red mud may further include a first belt quantitative feeder 5, which is located above the mixing device 4 and is used to quantitatively deliver red mud powder and composite sintering aid powder to the mixing device 4. In one embodiment, other types of feeding mechanisms may also be used to deliver red mud powder and composite sintering aid powder.

[0039] In one embodiment, the first hydraulic cylinder of the green body forming device 1 is connected to the upper mold, and the upper mold presses the hexagonal honeycomb wall into the hexagonal honeycomb wall groove of the lower mold under the downward action of the first hydraulic cylinder to form the mixed powder. In one embodiment, the green body forming pressure ranges from 20Mpa to 40Mpa, and the pressure holding time is 10s to 30s.

[0040] In one embodiment, the cross section of the upper mold is a uniformly distributed hexagonal honeycomb wall structure. The blank is correspondingly inserted into the hexagonal honeycomb wall groove of the lower mold during molding. In one embodiment, the cross section of the lower mold is a uniformly distributed hexagonal honeycomb wall groove structure.

[0041] In one embodiment, the quantitative distributor quantitatively loads the mixed powder and reciprocates in contact with the upper surface of the lower mold during distribution, and the mixed powder is evenly loaded into the hexagonal honeycomb wall grooves of the lower mold by the quantitative distributor. In one embodiment, the distribution weight ranges from 10kg to 30kg.

[0042] In one embodiment, the second hydraulic cylinder is located on both sides of the lower mold, and after the blank is formed, the lower mold is lifted upward to demould the blank. In one embodiment, the demoulding pressure ranges from 5Mpa to 20Mpa.

[0043] In one embodiment, the third hydraulic cylinder is located on the left inner wall of the blank forming device, and after the blank is formed and demolded from the lower mold, the third hydraulic cylinder pushes the blank to the right onto the roller conveyor. In one embodiment, the pressure range is 2Mpa-5Mpa.

[0044] In one embodiment, the mixing device is a V-shaped mixer, which can adjust the mixing time and the mixing speed. In one embodiment, the mixing time is 30 min-200 min, and the mixing speed is 15 r / min-200 r / min.

[0045] In one embodiment, the powder flow control valve is a valve capable of adjusting the powder flow rate.

[0046] In one embodiment, the sintering device is a roller kiln, which can adjust the temperature and heating time of each temperature zone. In one embodiment, the sintering device is divided into a preheating zone, a firing zone, and a cooling zone. The temperature of the preheating zone can be 25°C-400°C, the temperature of the firing zone can be 400°C-1250°C, and the temperature of the cooling zone can be 1250°C-75°C.

[0047] Figure 2 A schematic cross-sectional view of an upper mold according to one embodiment is shown, which shows a hexagonal honeycomb wall structure.

[0048] Figure 3 A cross-sectional schematic diagram of a lower mold according to an embodiment is shown, which shows a hexagonal honeycomb wall groove structure.

[0049] Figure 4 The structure diagram of a device for preparing honeycomb material using red mud according to one embodiment is shown. It should be noted that: Figure 4 The various components shown in the figure are only used to illustrate the embodiment, and it does not mean that each component is necessary for the solution. The device includes:

[0050] The blank forming device 1 comprises a first hydraulic cylinder 1-1 and an upper mold 1-2, a lower mold 1-4 is disposed below the upper mold, second hydraulic cylinders 1-3 are disposed on both sides of the lower mold, a third hydraulic cylinder 1-5 is disposed on the left inner wall of the blank forming device 1, and a quantitative distributor 1-6 is disposed above the third hydraulic cylinder;

[0051] A powder flow control valve 2 is located above the green body forming device 1 and is used to control the flow of mixed powder;

[0052] A mixed powder storage bin 3, located above the powder flow control valve 2, is used to store the mixed powder;

[0053] The mixing device 4 is located above the mixed powder storage bin 3 and is used to adjust the particle size distribution of the mixed powder and evenly mix the red mud powder and the composite sintering aid powder;

[0054] The first belt quantitative feeder 5 is located above the mixing device 4 and is used for quantitatively conveying red mud powder and composite sintering aid powder to the mixing device 4 .

[0055] The composite sintering aid powder storage bin 6 and the red mud powder storage bin 12 are located above the first belt quantitative feeder 5 and are used to store the composite sintering aid powder and the red mud powder respectively;

[0056] The first ball mill 7 and the second ball mill 11 are respectively located above the composite sintering aid powder storage bin 6 and the red mud powder storage bin 12, and are used for grinding the composite sintering aid and grinding the red mud respectively.

[0057] A second belt quantitative feeder 8 is located above the first ball mill 7 and the second ball mill 11, and is used for quantitatively conveying the composite sintering aid and red mud to the first ball mill 7 and the second ball mill 11;

[0058] The composite sintering aid storage bin 9 and the red mud storage bin 10 are located above the second belt quantitative feeder 8 and are used to store the composite sintering aid and the red mud respectively;

[0059] A roller conveyor 13, located between the green body forming device 1 and the sintering device 14, for conveying the honeycomb material green body to the sintering device 14; and

[0060] The sintering device 14 is located at the end of the roller conveyor 13 and is used to sinter the honeycomb material green body into a honeycomb material finished product.

[0061] In one embodiment, the particle size of the first ball mill is -200 mesh>75%. In one embodiment, the particle size of the second ball mill is -325 mesh>90%.

[0062] Figure 5 A simplified process flow diagram of using red mud to prepare honeycomb materials according to one embodiment is shown. Figure 5 The device provided by the utility model is used to prepare red mud honeycomb materials, comprising the following steps:

[0063] (1) Red mud with a moisture content of 2% to 15% is fed into a ball mill through a belt quantitative feeder for ball milling to obtain red mud powder with a particle size of -325 mesh>90%.

[0064] (2) The composite sintering aid (including kaolin and quartz sand added in an amount of 45%-65% of the weight of dry red mud) is fed into a ball mill via a belt quantitative feeder for ball milling to obtain the composite sintering aid powder with a particle size of -200 mesh>75%.

[0065] (3) The red mud powder and the composite sintering aid powder are fed into a V-type mixer via a belt quantitative feeder for particle size control and uniform mixing to obtain a mixed powder.

[0066] (4) The mixed powder is fed into the quantitative distributor of the blank forming device, and quantitatively distributed to the lower mold, with a distribution weight of 10kg-30kg. After the lower mold is evenly loaded with the mixed powder, the upper mold is pressed into the hexagonal honeycomb wall groove of the lower mold under the downward action of the first hydraulic cylinder to form the mixed powder. The second hydraulic cylinder rises upward to separate the lower mold from the blank, and the blank is demolded to obtain a red mud honeycomb material blank. The blank molding pressure range is 20Mpa-40Mpa, and the pressure holding time is 10s-30s. The demolding pressure range is 5Mpa-20Mpa.

[0067] (5) The honeycomb material blank is pushed into the roller conveyor by the third hydraulic cylinder and sent into the roller kiln for sintering. The honeycomb material blank passes through the preheating zone, the firing zone, and the cooling zone in the roller kiln. In the preheating zone, the attached water and crystal water in the honeycomb material blank are removed; under the high temperature of the firing zone, the alkali in the red mud of the honeycomb material blank and part of the composite sintering aids generate liquid products with high viscosity, which wrap and bond the remaining composite sintering aids. The organic flocculant components in the red mud act as good pore-forming agents. Under the combined action of particle accumulation and cooling shrinkage, the cooling in the cooling zone forms a sintered honeycomb material with developed interconnected channels in the honeycomb wall. It has excellent filtering performance and can be used in flue gas purification, waste gas treatment, sewage treatment and other fields. The high-value, full-quantity and resource utilization of red mud is realized. The temperature of the preheating zone is 25℃-400℃, the temperature of the firing zone is 400℃-1250℃, and the temperature of the cooling zone is 1250℃-75℃.

[0068] Obviously, the above embodiments are only some embodiments of the present utility model, rather than all embodiments. The above embodiments are only used to explain the present utility model and do not constitute a limitation on the protection scope of the present utility model. Based on the above embodiments, all other embodiments obtained by those skilled in the art without making creative work, that is, all modifications, equivalent substitutions and improvements made within the spirit and principles of the present application, fall within the protection scope required by the present utility model.

[0069] References herein to "various embodiments", "some embodiments", "one embodiment", or "an embodiment" refer to specific features, structures, or properties described in conjunction with the embodiments being included in at least one embodiment. Therefore, the phrases "in various embodiments", "in some embodiments", "in one embodiment", or "in an embodiment" appearing throughout the present invention do not necessarily refer to the same embodiment. In addition, specific features, structures, or properties may be combined in any suitable manner in one or more embodiments. Therefore, specific features, structures, or properties shown or described in conjunction with one embodiment may be combined in whole or in part with features, structures, or properties of one or more other embodiments without restriction, as long as the combination is not illogical or inoperable. Expressions similar to "according to A", "based on A", "through A", or "using A" appearing herein are intended to be non-exclusive, that is, "according to A" may include "according to A only" or "according to A and B", unless it is specifically stated that its meaning is "according to A only". In this application, for the sake of clarity, some exemplary operating steps are described in a certain order, but those skilled in the art will understand that each of these operating steps is not essential, and some of the steps may be omitted or replaced by other steps. These operation steps do not have to be executed sequentially in the manner shown; on the contrary, some of these operation steps can be executed in different orders or in parallel according to actual needs, as long as the new execution manner is not illogical or inoperable.

Claims

1. A device for preparing honeycomb material using red mud, characterized in that: The device includes: The red mud powder storage bin (12) and the composite sintering aid powder storage bin (6) are used to store the red mud powder and the composite sintering aid powder respectively; A mixing device (4) for mixing red mud powder from the red mud powder storage bin (12) and composite sintering aid powder from the composite sintering aid powder storage bin (6); A blank forming device (1) is used to form a honeycomb material blank from the mixed powder, the blank forming device (1) comprising a first hydraulic cylinder (1-1), an upper mold (1-2), a lower mold (1-4) below the upper mold, second hydraulic cylinders (1-3) on both sides of the lower mold, a third hydraulic cylinder (1-5) installed on the inner wall of the blank forming device (1), and a quantitative distributor (1-6) above the third hydraulic cylinder; A roller conveyor (13) is located between the green body forming device (1) and the sintering device (14), and is used to convey the honeycomb material green body to the sintering device (14); and The sintering device (14) is located at the end of the roller conveyor (13) and is used to sinter the honeycomb material green body into a honeycomb material finished product.

2. The device according to claim 1, characterized in that Also includes: a mixed powder storage bin (3) located between the mixing device (4) and the blank forming device (1), for temporarily storing the mixed powder from the mixing device (4); and A powder flow control valve (2) located between the mixed powder storage bin (3) and the green body forming device (1) is used to control the flow of the mixed powder.

3. The device according to claim 1, characterized in that Also includes: The first belt quantitative feeder (5) is located above the mixing device (4) and is used to quantitatively convey red mud powder and composite sintering aid powder to the mixing device (4).

4. The device according to claim 1, characterized in that Also includes: The first ball mill (7) and the second ball mill (11) are respectively located above the composite sintering aid powder storage bin (6) and the red mud powder storage bin (12), and are used for grinding the composite sintering aid and grinding the red mud respectively; a second belt quantitative feeder (8), located above the first ball mill (7) and the second ball mill (11), and used for quantitatively conveying red mud and composite sintering aid to the first ball mill (7) and the second ball mill (11); and The composite sintering aid storage bin (9) and the red mud storage bin (10) are located above the second belt quantitative feeder (8) and are used to store the composite sintering aid and red mud respectively.

5. The device according to claim 1, characterized in that The first hydraulic cylinder (1-1) of the green body forming device (1) is connected to the upper mold (1-2), and the upper mold (1-2) is used to press the hexagonal honeycomb wall into the hexagonal honeycomb wall groove of the lower mold (1-4) under the downward action of the first hydraulic cylinder (1-1), so as to form the mixed powder.

6. The device according to claim 1, characterized in that The cross section of the upper mold (1-2) is a uniformly distributed hexagonal honeycomb wall structure, and the cross section of the lower mold (1-4) is a uniformly distributed hexagonal honeycomb wall groove structure.

7. The device according to claim 4, characterized in that The particle size of the material discharged from the first ball mill (7) is -200 mesh>75%.

8. The device according to claim 4, characterized in that The particle size of the output of the second ball mill (11) is -325 mesh>90%.

9. The device according to claim 1, characterized in that The mixing device (4) is a V-shaped mixer capable of regulating mixing time and mixing speed.

10. The device according to claim 1, characterized in that The sintering device (14) is a roller kiln capable of regulating the temperature and heating time of each temperature zone.

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