Red mud-based powder preparation device

Abstract

The utility model provides a red mud-based powder preparation device. The red mud-based powder preparation device comprises a raw material storage and transportation device; a primary grinding device; the first-stage grading device is connected with the discharging end of the first-stage grinding device; the first-stage red mud-based fine powder storage bin is arranged below the first cloth bag type dust collector of the first-stage grading device; a discharging opening of the second-stage grinding device is used for receiving the first-stage red mud-based fine powder and an additive; the second-stage grading device is connected with the discharging end of the second-stage grinding device; and the second-stage red mud-based fine powder storage bin is arranged below the second cloth bag type dust collector of the second-stage grading device. By means of the device, the red mud can be used for preparing the red mud-based powder material, the characteristics that the red mud is soft and easy to grind are fully utilized, flue gas waste heat is utilized, drying, grinding and modification act at the same time, red mud-based powder material products with different granularities can be prepared, 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 red mud-based powder preparation device. 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 an alkaline solid waste produced in the process of producing alumina using bauxite as raw material. For every ton of alumina produced, about 1.0-1.5 tons of red mud are produced. my country is a major producer of alumina. With the annual increase in alumina production and the gradual decrease in the grade of bauxite, the annual production of red mud will continue to increase. Large amounts of stockpiled red mud not only occupy land and waste resources, but also easily cause environmental risks and safety hazards. At present, the comprehensive utilization of red mud is still a global problem, and the main disposal method is stockpiling.

[0004] In recent years, the comprehensive utilization of red mud has received great attention from all parties, and interdisciplinary and multi-field comprehensive utilization technology research has been carried out, such as red mud ingredients to produce cement, building bricks, cementitious materials, roadbed consolidation materials and high-performance concrete admixtures, thermal insulation refractory materials, etc. Due to the alkali content, large production volume and high moisture content of red mud, its large-scale and high-value utilization is restricted. Therefore, obtaining red mud-based powder materials with low moisture content and uniform particle size distribution is an urgent problem to be solved for the large-scale utilization of red mud. At present, there is no technology and equipment for the preparation of red mud-based powder. Utility Model Content

[0005] In order to achieve the purpose of preparing powder materials using red mud, the utility model provides a red mud-based powder preparation device, which can prepare red mud-based powder materials using red mud, thereby providing convenience and guarantee for the high-value utilization of red mud.

[0006] One aspect of the utility model relates to a red mud-based powder preparation device, the device comprising:

[0007] Raw material storage and transportation device, including mixing material storage bin, red mud storage bin, material discharge hopper, belt quantitative feeder;

[0008] A primary grinding device is located at the end of the belt quantitative feeder. The feeding end of the primary grinding device includes a flue gas receiving port and a raw material receiving port. The raw material receiving port is used to receive the red mud and admixtures conveyed by the belt quantitative feeder.

[0009] A primary classification device, which is connected to the discharge end of the primary grinding device, comprises a first cyclone dust collector, a first bag dust collector and a primary red mud-based powder storage bin;

[0010] A primary red mud-based fine powder storage bin is provided below the first bag-type dust collector and is used to store the primary red mud-based fine powder classified by the primary classification device and to transport the primary red mud-based fine powder to the secondary grinding device;

[0011] A secondary grinding device, whose discharge port receives the primary red mud-based fine powder from the primary red mud-based fine powder storage bin;

[0012] A secondary classification device, which is connected to the discharge end of the secondary grinding device, comprises a second cyclone dust collector, a second bag dust collector and a secondary red mud-based powder storage bin;

[0013] The secondary red mud-based fine powder storage bin is arranged below the second bag-type dust collector and is used to store the secondary red mud-based fine powder classified by the secondary classification device.

[0014] In one embodiment, the red mud-based powder preparation device further comprises:

[0015] A first automatic packaging machine, which is arranged below the first-level red mud-based powder storage bin and is used to package the first-level red mud-based powder into finished products;

[0016] A second automatic packaging machine, which is arranged below the secondary red mud-based powder storage bin and is used to package the secondary red mud-based powder into finished products;

[0017] The third automatic packaging machine is arranged below the secondary red mud-based fine powder storage bin and is used for packaging the secondary red mud-based fine powder into finished products.

[0018] In one embodiment, the primary grinding device is provided with a flow sensor and a temperature sensor for the flue gas received by the flue gas receiving port.

[0019] In one embodiment, the primary grinding device is a ball mill.

[0020] In one embodiment, the particle size of the primary red mud-based powder discharged from the discharge port of the first cyclone dust collector in the primary classification device is -200 mesh>90%.

[0021] In one embodiment, the particle size of the primary red mud-based fine powder discharged from the discharge port of the first bag-type dust collector in the primary classification device is -500 mesh>95%.

[0022] In one embodiment, the secondary grinding device is a Raymond mill.

[0023] In one embodiment, the particle size of the secondary red mud-based powder discharged from the discharge port of the second cyclone dust collector in the secondary classification device is -1000 mesh>90%.

[0024] In one embodiment, the particle size of the secondary red mud-based fine powder discharged from the discharge port of the second bag-type dust collector in the secondary classification device is -2000 mesh>95%.

[0025] In one embodiment, the red mud-based powder preparation device further comprises an additive storage tank for adding additives to the secondary grinding device.

[0026] The beneficial effects of the utility model are as follows: through the red mud-based powder preparation device, the red mud and the admixture are sent into the ball mill, and under the combined effect of flue gas waste heat and ball mill grinding, the rapid drying and grinding of the red mud are realized simultaneously, and the first-level red mud-based powder product and the first-level red mud-based fine powder are obtained through the first-level grading device. The first-level red mud-based powder can be used for red mud-based roadbed materials, cement raw materials, sintered bricks and other raw materials; additives are added to the first-level red mud-based fine powder, and it is modified after being ground by Raymond mill, and two products of second-level red mud-based powder and second-level red mud-based fine powder are obtained through grading by the second-level grading device, which can be used as raw materials such as fillers, thermal insulation materials, and ceramics. This scheme makes full use of the soft and easy-to-grind characteristics of red mud, and uses the waste heat of flue gas (for example, the waste heat of flue gas from the alumina production system) to dry, grind, modify, and grade the red mud, prepare products of different particle sizes, obtain high-value red mud-based powder materials, and realize the high-value, full-quantity, and resource utilization of red mud. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The following is a further description of the embodiments of the present invention with reference to the accompanying drawings, wherein:

[0028] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0029] Figure 2 The utility model is a simplified process flow diagram of an embodiment.

[0030] In the figure, 1 is a raw material storage and transportation device, 1-1 is a blending material storage bin, 1-2 is a red mud storage bin, 1-3 is a feeding hopper, 1-4 is a belt quantitative feeder, 2 is a smoke generating device, 3 is a primary grinding device, 4 is a primary grading device, 4-1 is a first cyclone dust collector, 4-2 is a first bag-type dust collector, 4-3 is a primary red mud-based powder storage bin, 5 is an additive storage tank, 6 is a primary red mud-based fine powder storage bin, 7 is a secondary grinding device, 8 is a secondary grading device, 8-1 is a second cyclone dust collector, 8-2 is a second bag-type dust collector, 8-3 is a secondary red mud-based powder storage bin, 9 is a first automatic packaging machine, 10 is a secondary red mud-based fine powder storage bin, 11 is a second automatic packaging machine, and 12 is a third automatic packaging machine. DETAILED DESCRIPTION

[0031] 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.

[0032] like Figure 1 As shown, a red mud-based powder preparation device according to one embodiment of the present application includes:

[0033] A raw material storage and transportation device 1, comprising a blending material storage bin 1-1, a red mud storage bin 1-2, a material discharge hopper 1-3, and a belt quantitative feeder 1-4, wherein a primary grinding device 3 is arranged at the end of the belt quantitative feeder 1-4;

[0034] The primary grinding device 3 is located at the end of the belt quantitative feeder 1-4. The feeding end of the primary grinding device 3 includes a smoke receiving port and a raw material receiving port. The smoke receiving port is used to receive the smoke from the smoke generating device 2. The raw material receiving port is used to receive the red mud and admixtures conveyed by the belt quantitative feeder 1-4. The discharge end of the primary grinding device 3 is connected to the primary classifying device 4.

[0035] The primary classification device 4 is located above the primary grinding device 3 and connected to the discharge end of the primary grinding device 3, and includes a first cyclone dust collector 4-1, a first bag dust collector 4-2 and a primary red mud-based powder storage bin 4-3;

[0036] A first automatic packaging machine 9 is provided below the first-level red mud-based powder storage bin 4-3, and is used to package the first-level red mud-based powder into finished products;

[0037] The primary red mud-based fine powder storage bin 6 is located below the first bag-type dust collector 4-2 and is used to store the primary red mud-based fine powder classified by the primary classification device and to transport the primary red mud-based fine powder to the secondary grinding device 7;

[0038] An additive storage tank 5, used to add additives to the secondary grinding device 7;

[0039] The secondary grinding device 7 is located below the primary red mud-based fine powder storage bin 6 and is used to further grind, disperse and modify the primary red mud-based fine powder. The discharge port of the secondary grinding device 7 receives the primary red mud-based fine powder from the primary red mud-based fine powder storage bin 6 and the additive from the additive storage tank 5.

[0040] A secondary classification device 8, connected to the discharge end of the secondary grinding device 7, comprises a second cyclone dust collector 8-1, a second bag dust collector 8-2 and a secondary red mud-based powder storage bin 8-3;

[0041] The second automatic packaging machine 11 provided below the secondary red mud-based powder storage bin 8-3 is used to package the secondary red mud-based powder into finished products;

[0042] The secondary red mud-based fine powder storage bin 10 is located below the second bag-type dust collector 8-2 and is used to store the secondary red mud-based fine powder after being classified by the secondary classification device;

[0043] The third automatic packaging machine 12 is located below the secondary red mud-based fine powder storage bin 10 and is used to package the secondary red mud-based fine powder into finished products.

[0044] In one embodiment, as needed, the red mud-based powder preparation device may use only any one or more of the first automatic packaging machine 9, the second automatic packaging machine 11, and the third automatic packaging machine 12, or none of them.

[0045] In one embodiment, flue gas is introduced into the feed end of the primary grinding device 3, and the flue gas temperature may be 120°C-300°C. In one embodiment, the flue gas flow rate may be adjusted, and a flow sensor may be provided in the primary grinding device 3 (e.g., near the feed end of the primary grinding device 3) to monitor the flue gas flow rate. In one embodiment, a temperature sensor may be provided in the primary grinding device 3 (e.g., near the feed end of the primary grinding device 3) to monitor the flue gas temperature.

[0046] In one embodiment, the primary grinding device 3 is a ball mill with a ball diameter ratio of The ball loading amount is 25%-35% of the total filling volume of the ball mill.

[0047] In one embodiment, the flue gas generated by the flue gas generating device 2 can be flue gas from an alumina roasting furnace, hot air from a clinker kiln head, flue gas from a clinker kiln tail, flue gas from a thermal power plant boiler, and the like.

[0048] In one embodiment, the discharge temperature of the red mud and the mixed powder of the admixed ingredients at the discharge port of the primary grinding device 3 is 55°C-70°C.

[0049] In one embodiment, the particle size of the primary red mud-based powder at the outlet of the first cyclone dust collector 4 - 1 in the primary classification device 4 is -200 mesh>90%, and the moisture content is <3%.

[0050] In one embodiment, the particle size of the primary red mud-based fine powder discharged from the discharge port of the first bag-type dust collector 4-2 in the primary classification device 4 is -500 mesh>95%, and the moisture content is <3%.

[0051] In one embodiment, the secondary grinding device 7 is a Raymond mill.

[0052] In one embodiment, the particle size of the secondary red mud-based powder at the outlet of the second cyclone dust collector 8-1 in the secondary classification device 8 is -1000 mesh>90%, and the moisture content is <2%.

[0053] In one embodiment, the particle size of the secondary red mud-based fine powder discharged from the discharge port of the second bag-type dust collector 8-2 in the secondary classification device 8 is -2000 mesh>95%, and the moisture content is <2%.

[0054] In one embodiment, the additive storage tank 5 quantitatively adds additives to the secondary grinding device 7, and the added amount can be 0%-5% of the weight of the primary red mud-based fine powder. The additives may include one or more of silane coupling agents, boric acid powder, sodium tetraborate, and water glass. When the amount of additive added is 0% of the weight of the primary red mud-based fine powder, it means that no additive is needed. Therefore, in one embodiment, the red mud-based powder preparation device may not include the additive storage tank 5.

[0055] In one embodiment, the admixture storage bin 1-1 is used to store admixtures, and the admixtures are transported to the primary grinding device 3 together with red mud by the belt quantitative feeder 1-4, and the amount of admixtures added can be 0%-200% of the weight of the red mud. The additives can include one or more of loess, clay, fly ash, desulfurized gypsum, blast furnace granulated slag, steel slag, gasified slag, coal gangue, bauxite tailings, waste glass, construction waste, sludge, and sand.

[0056] refer to Figure 2 The process of preparing red mud-based powder using the device provided by the utility model is described, including the following steps:

[0057] (1) Red mud with a moisture content of less than 35% and admixtures (which may include one or more of loess, clay, fly ash, desulfurized gypsum, blast furnace granulated slag, steel slag, gasified slag, coal gangue, bauxite tailings, waste glass, abandoned construction waste, sludge, and sand, and the amount of admixture added is 0%-200% of the weight of the red mud) are fed into a discharge hopper, and then fed into a ball mill through a belt quantitative feeder. At the same time, flue gas is introduced into the ball mill, and the flue gas may be flue gas from an alumina roasting furnace / hot air from a clinker kiln head / flue gas from a clinker kiln tail / flue gas from a thermal power plant boiler. Under the combined action of flue gas waste heat and ball mill grinding, the red mud and admixtures are quickly dried and ground to obtain a mixed powder of red mud and admixtures, and the discharge temperature is 55°C-70°C.

[0058] (2) The mixed powder of red mud and admixture is sent to a cyclone dust collector of a primary grading device, and after centrifugal separation, a mixed powder of red mud and admixture with a particle size of -200 mesh>90% and a moisture content of <3% is obtained as a primary red mud-based powder, which is sent to a primary red mud-based powder storage bin and packaged into a primary red mud-based powder finished product by an automatic packaging machine; and then separated by a bag-type dust collector in the primary grading device, a mixed powder of red mud and admixture with a particle size of -500 mesh>95% and a moisture content of <3% is obtained as a primary red mud-based fine powder, which is sent to a primary red mud-based fine powder storage bin.

[0059] (3) The primary red mud-based fine powder and additives are fed into a Raymond mill. After being ground by a Raymond mill, the powder is modified and fed into a cyclone dust collector of a secondary grading device. After centrifugal separation, a modified mixed powder of red mud and admixtures with a particle size of -1000 mesh>90% and a moisture content of <2% is obtained as a secondary red mud-based powder, which is fed into a secondary red mud-based powder storage bin and packaged into a secondary red mud-based powder product by an automatic packaging machine; and then separated by a bag-type dust collector in the secondary grading device, a modified mixed powder of red mud and admixtures with a particle size of -2000 mesh>95% and a moisture content of <2% is obtained as a secondary red mud-based fine powder, which is fed into a secondary red mud-based fine powder storage bin and packaged into a secondary red mud-based fine powder product by an automatic packaging machine.

[0060] 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.

[0061] Having thus described several aspects of at least one embodiment of the present invention, it will be appreciated that various changes, modifications and improvements will readily occur to those skilled in the art. Such changes, modifications and improvements are intended to be within the spirit and scope of the present invention. Although the present invention has been described by way of some embodiments, the present invention is not limited to the embodiments described herein, and includes various changes and variations made without departing from the scope of the present invention.

Claims

1. A red mud-based powder preparation device, characterized in that: The device includes: A raw material storage and transportation device (1), comprising a blending material storage bin (1-1), a red mud storage bin (1-2), a material discharge hopper (1-3), and a belt quantitative feeder (1-4); A primary grinding device (3) is located at the end of the belt quantitative feeder (1-4), and the feeding end of the primary grinding device (3) comprises a smoke receiving port and a raw material receiving port, wherein the raw material receiving port is used to receive the red mud and admixtures conveyed by the belt quantitative feeder (1-4); A primary classification device (4), which is connected to the discharge end of the primary grinding device (3), and comprises a first cyclone dust collector (4-1), a first bag-type dust collector (4-2) and a primary red mud-based powder storage bin (4-3); A primary red mud-based fine powder storage bin (6) is disposed below the first bag-type dust collector (4-2) and is used to store the primary red mud-based fine powder classified by the primary classification device (4) and to transport the primary red mud-based fine powder to the secondary grinding device (7); A secondary grinding device (7) having a discharge port for receiving the primary red mud-based fine powder from the primary red mud-based fine powder storage bin (6); A secondary classification device (8), which is connected to the discharge end of the secondary grinding device (7), and comprises a second cyclone dust collector (8-1), a second bag-type dust collector (8-2) and a secondary red mud-based powder storage bin (8-3); A secondary red mud-based fine powder storage bin (10) is arranged below the second bag-type dust collector (8-2) and is used to store the secondary red mud-based fine powder that has been classified by the secondary classification device (8).

2. A red mud-based powder preparation device according to claim 1, characterized in that: Also includes: a first automatic packaging machine (9), which is arranged below the first-level red mud-based powder storage bin (4-3) and is used to package the first-level red mud-based powder into finished products; a second automatic packaging machine (11), which is arranged below the secondary red mud-based powder storage bin (8-3) and is used to package the secondary red mud-based powder into finished products; The third automatic packaging machine (12) is arranged below the secondary red mud-based fine powder storage bin (10) and is used to package the secondary red mud-based fine powder into finished products.

3. A red mud-based powder preparation device according to claim 1, characterized in that: The primary grinding device (3) is provided with a flow sensor and a temperature sensor for the smoke received by the smoke receiving port.

4. A red mud-based powder preparation device according to claim 1, characterized in that: The primary grinding device (3) is a ball mill.

5. The red mud-based powder preparation device according to claim 1, characterized in that: The particle size of the primary red mud-based powder discharged from the discharge port of the first cyclone dust collector (4-1) in the primary classification device (4) is -200 mesh>90%.

6. A red mud-based powder preparation device according to claim 1, characterized in that: The particle size of the primary red mud-based fine powder discharged from the discharge port of the first bag-type dust collector (4-2) in the primary classification device (4) is -500 mesh>95%.

7. The red mud-based powder preparation device according to claim 1, characterized in that: The secondary grinding device (7) is a Raymond mill.

8. The red mud-based powder preparation device according to claim 1, characterized in that: The particle size of the secondary red mud-based powder discharged from the discharge port of the second cyclone dust collector (8-1) in the secondary classification device (8) is -1000 mesh>90%.

9. The red mud-based powder preparation device according to claim 1, characterized in that: The particle size of the secondary red mud-based fine powder discharged from the discharge port of the second bag-type dust collector (8-2) in the secondary classification device (8) is -2000 mesh>95%.

10. The red mud-based powder preparation device according to claim 1, characterized in that: Also includes: An additive storage tank (5) is used to add additives to the secondary grinding device (7).

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