A crushing device and a method for preparing calcium aluminate by high-temperature calcination of aluminum ash.

Abstract

This invention provides a method for preparing calcium aluminate by high-temperature calcination of aluminum ash, relating to the field of calcium aluminate preparation technology. The method includes the following steps: Step 1: Limestone and aluminum ash slag are crushed into two raw materials using a crushing device; Step 2: The two raw materials are mixed in a certain proportion and then fed into a ball mill to be ground into powder; Step 3: The powder is fed into a rotary kiln for calcination at a temperature of 1300–1400°C, and after sintering and cooling, the finished calcium aluminate is obtained. The method involves thoroughly crushing the limestone and aluminum ash slag before mixing and calcining, thereby ensuring a more complete reaction and reducing calcination time. This process of multiple stages of crushing not only allows for the output of materials of the appropriate particle size at any time but also avoids the situation where the initial spacing of the crushing rollers is too small, preventing the crushing of large pieces of material, as is often the case with single-stage fine crushing.

Description

Technical Field

[0001] This invention relates to the field of calcium aluminate preparation technology, specifically a method for preparing calcium aluminate by high-temperature calcination of aluminum ash. Background Technology

[0002] Calcium aluminate is a series of inorganic compounds formed by sintering calcium oxide and aluminum oxide at high temperatures, with the general formula mCaO·nAl2O3. Due to its high hardness and high melting point, it is widely used in industries such as cement, water treatment, and steelmaking. Calcium aluminate products have good market competitiveness and economic benefits in China.

[0003] However, when using aluminum ash and limestone to produce calcium aluminate, the preliminary crushed aluminum ash and limestone are directly mixed and smelted. Because they are not fully crushed, the reaction may be incomplete, affecting the product performance. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing calcium aluminate by high-temperature calcination of aluminum ash, aiming to solve the problem in the prior art where the raw materials are not fully pulverized, which may lead to incomplete reaction.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: the method for preparing calcium aluminate by high-temperature calcination of aluminum ash includes the following steps:

[0006] Step 1: Crush limestone and aluminum ash slag into two raw materials using crushing equipment;

[0007] Step 2: Mix the two raw materials in a certain proportion and then feed them into a ball mill to grind them into powder;

[0008] Step 3: The powder material is fed into a rotary kiln for calcination at a temperature of 1300-1400℃. After sintering and cooling, the calcium aluminate product is obtained.

[0009] A further technical solution of the present invention is that the crushing equipment includes a box body, a feed inlet is provided on one side of the top of the box body, two crushing rollers are installed inside the box body, a driving device for driving the two crushing rollers to rotate is installed on one side of the box body, one end of the crushing rollers is located below the feed inlet, the diameter of the two crushing rollers gradually increases from one end of the feed inlet to the other end, the axes of the two crushing rollers are parallel, a flexible cylindrical screen is provided inside the box body, the two crushing rollers are located inside the cylindrical screen, a bent baffle plate with the same length as the cylindrical screen is provided on the inner wall of the cylindrical screen, a motion device for moving the cylindrical screen is installed inside the box body, and a feeding component is provided on the two crushing rollers for moving the material a certain distance away from the feed inlet when it falls.

[0010] A further technical solution of the present invention is that the bending baffle plate includes a support rod arranged along the length direction of the cylindrical screen, and a bending plate is fixedly connected to the support rod. The tangent line on the cylindrical screen with the axis of the support rod as the tangent point is parallel to the bending section of the bending plate away from the support rod.

[0011] A further technical solution of the present invention is that the motion device includes a guide component for maintaining a fixed shape when the cylindrical screen moves and a drive component for moving the cylindrical screen.

[0012] A further technical solution of the present invention is that the guiding component includes a plurality of flexible steel strips disposed on a cylindrical screen for connecting all the support rods, sliders are equally spaced on the flexible steel strips, a closed-loop slide rail is fixedly connected inside the box, the sliders can slide on the closed-loop slide rail, and the middle of the top of the closed-loop slide rail is concave downward.

[0013] A further technical solution of the present invention is that the driving device includes two gears respectively coaxially mounted with the two crushing rollers, the two gears meshing with each other, and a reduction motor for driving its rotation is mounted on one of the gears.

[0014] A further technical solution of the present invention is that the driving assembly includes a closed-loop driving belt fixedly connected to the outer surface of the cylindrical screen, a rotating roller is provided at the top of the cylindrical screen, a driving wheel that is connected to the driving belt is fixedly installed on the rotating roller, and one end of the rotating roller is connected to the gear transmission through a gear set.

[0015] A further technical solution of the present invention is that the feeding assembly includes a plurality of inclined plates equally spaced below the two crushing rollers, and the projections of all the inclined plates on the horizontal plane have overlapping portions. A connecting plate is fixedly connected inside the box, and the inclined plates are fixedly mounted on the connecting plate.

[0016] In order to enable the present invention to avoid clogging of the cylindrical screen, a further technical solution of the present invention is that the rotating roller has a hollow structure, the rotating roller is provided with air blowing holes, and one end of the rotating roller is connected to an air pump through a rotary joint.

[0017] A further technical solution of the present invention is that both ends of the box are provided with guide slopes.

[0018] The beneficial effects of this invention are:

[0019] 1. When using this invention, limestone and aluminum ash slag are thoroughly crushed and then mixed and calcined to make the reaction more complete and reduce the calcination time.

[0020] 2. In use, the raw material is fed into the space between two crushing rollers through the feed inlet for crushing. At the same time, the moving device causes the crushing rollers to rotate and crush the raw material. The crushed material falls onto the cylindrical screen after passing through the feeding assembly. The position on the cylindrical screen is relative to the distance from the end where the material fell from the crushing roller. Particles that meet the particle size requirements fall onto the screw conveyor through the screen and are then transported out. Particles that do not meet the particle size requirements are moved back above the crushing rollers by the movement of the bending baffle and then thrown between the two crushing rollers. At this time, the distance between the two crushing rollers where the material is located is smaller than the distance between the two crushing rollers during the previous crushing. This process is repeated multiple times to perform graded crushing. This not only allows materials that meet the particle size requirements to be discharged at any time, but also avoids the situation where the initial distance between the crushing rollers is too small, which would prevent the crushing of large pieces of material when using primary fine crushing.

[0021] 3. When this invention is used, the bent baffle plate and flexible steel belt form the skeleton of the cylindrical screen, which not only enables multiple material lifting and controls the movement of the cylindrical screen, but also strengthens the cylindrical screen.

[0022] 4. When using this invention, start the air pump to allow compressed air to enter the rotating roller, and then spray it out through the air blowing hole, thereby using the airflow to blow out the material blocked in the screen hole of the cylindrical screen, which facilitates the unblocking of the screen. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the internal structure of a specific embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the structure after removing the cylindrical screen in a specific embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the internal structure of the cylindrical screen in a specific embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of the structure of the bent baffle plate in a specific embodiment of the present invention.

[0028] Figure 6 This is a schematic diagram of the structure of the guide component in a specific embodiment of the present invention.

[0029] Figure 7 This is a side view inside a specific embodiment of the present invention.

[0030] Figure 8 This is a schematic diagram of the structure of the guide slope in a specific embodiment of the present invention.

[0031] Figure 9 This is a schematic diagram of the feeding assembly in a specific embodiment of the present invention.

[0032] Figure 10 This is a schematic diagram of the structure of the crushing roller in a specific embodiment of the present invention.

[0033] In the diagram: 1. Box body; 2. Feed inlet; 3. Crushing roller; 4. Cylindrical screen; 5. Bending baffle plate; 51. Support rod; 52. Bending plate; 6. Feeding assembly; 61. Inclined plate; 62. Connecting plate; 7. Drive unit; 71. Gear; 72. Geared motor; 8. Motion device; 81. Guide assembly; 811. Flexible steel belt; 812. Slider; 813. Closed-loop slide rail; 82. Drive assembly; 821. Drive belt; 822. Rotating roller; 8221. Air blowing hole; 823. Drive wheel; 824. Gear set; 9. Screw discharge machine; 10. Guide slope; 11. Air pump. Detailed Implementation

[0034] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0035] A method for preparing calcium aluminate by high-temperature calcination of aluminum ash includes the following steps:

[0036] Step 1: Crush limestone and aluminum ash slag into two raw materials using crushing equipment;

[0037] Step 2: Mix the two raw materials in a certain proportion and then feed them into a ball mill to grind them into powder;

[0038] Step 3: The powder material is fed into a rotary kiln for calcination at a temperature of 1300-1400℃. After sintering and cooling, the calcium aluminate product is obtained.

[0039] In this specific embodiment, limestone and aluminum ash slag are thoroughly crushed and then mixed and calcined to make the reaction more complete and reduce the calcination time.

[0040] like Figure 1-4As shown, the crushing equipment includes a housing 1. A feed inlet 2 is located on one side of the top of the housing 1. Two crushing rollers 3 are installed inside the housing 1. A drive device 7 for rotating the two crushing rollers 3 is installed on one side of the housing 1. One end of each crushing roller 3 is located below the feed inlet 2. The diameter of the two crushing rollers 3 gradually increases from one end of the feed inlet 2 to the other end. The axes of the two crushing rollers 3 are parallel. A flexible cylindrical screen 4 is installed inside the housing 1. Raw materials are fed through the feed inlet 2 between the two crushing rollers 3 for crushing. Simultaneously, the drive device 8 rotates the crushing rollers 3 to crush the raw materials. The crushed material falls onto the cylindrical screen 4 after passing through the feeding assembly 6. The two crushing rollers 3 are located inside the cylindrical screen 4. The inner wall of the cylindrical screen 4... A bent baffle plate 5 of the same length as the cylindrical screen 4 is provided. The movement of the bent baffle plate 5 causes the material in the cylindrical screen 4 to move to the top of the crushing roller 3 and then be thrown between the two crushing rollers 3. A motion device 8 for moving the cylindrical screen 4 is installed in the housing 1. The two crushing rollers 3 are provided with a feeding component 6 for moving the material a distance away from the feed inlet 2 when it falls. The position of the material after passing through the crushing rollers 3 on the cylindrical screen 4 is a distance away from the position where it just fell from the crushing rollers 3. Particles that meet the particle size requirements fall through the cylindrical screen 4 onto the screw conveyor 9 and are then transported out. Materials that do not meet the requirements are thrown to a place further back than the previous crushing position for finer crushing.

[0041] like Figure 5 As shown, the bending baffle 5 includes a support rod 51 arranged along the length of the cylindrical screen 4, and a bending plate 52 is fixedly connected to the support rod 51. The tangent line on the cylindrical screen 4 with the axis of the support rod 51 as the tangent point is parallel to the bending section of the bending plate 52 away from the support rod 51.

[0042] Specifically, the motion device 8 includes a guide assembly 81 for maintaining a fixed shape when the cylindrical screen 4 moves and a drive assembly 82 for moving the cylindrical screen 4.

[0043] like Figure 3 As shown, the guide assembly 81 includes multiple flexible steel strips 811 mounted on the cylindrical screen 4 for connecting all the support rods 51. Slider blocks 812 are evenly spaced on the flexible steel strips 811. A closed-loop slide rail 813 is fixedly connected inside the housing 1. The sliders 812 can slide on the closed-loop slide rail 813. The top center of the closed-loop slide rail 813 is concave downwards. When the bending baffle 5 moves to the top center of the closed-loop slide rail 813, the bending section of the bending plate 52 away from the support rod 51 tilts downwards to pour material. The bending baffle 5 and the flexible steel strips 811 form the skeleton of the cylindrical screen 4, which not only realizes multiple material lifting and controls the movement of the cylindrical screen 4, but also strengthens the strength of the cylindrical screen 4.

[0044] like Figure 2As shown, the drive unit 7 includes two gears 71 that are coaxially mounted with the two crushing rollers 3 respectively. The two gears 71 mesh with each other, and a geared motor 72 for driving its rotation is mounted on one of the gears 71.

[0045] like Figure 3 As shown, the drive assembly 82 includes a closed-loop drive belt 821 fixedly connected to the outer surface of the cylindrical screen 4. A rotating roller 822 is provided on the top of the cylindrical screen 4. A drive wheel 823, which is connected to the drive belt 821, is fixedly mounted on the rotating roller 822. One end of the rotating roller 822 is connected to the gear 71 through a gear set 824. The rotation of the gear 71 causes the rotating roller 822 to rotate through the gear set 824, thereby causing the drive wheel 823 to move with the drive belt 821, thus causing the cylindrical screen 4 to move.

[0046] like Figure 9 As shown, the feeding assembly 6 includes multiple inclined plates 61 that are equally spaced below the two crushing rollers 3. The projections of all the inclined plates 61 on the horizontal plane have overlapping parts. A connecting plate 62 is fixedly connected inside the housing 1. The inclined plates 61 are fixedly installed on the connecting plate 62. When the material falls on the inclined plate 61, it will move forward a certain distance.

[0047] like Figure 2 As shown, the rotating roller 822 has a hollow structure and is provided with an air blowing hole 8221. One end of the rotating roller 822 is connected to an air pump 11 through a rotary joint 11.

[0048] like Figure 7 and 8 As shown, both ends of the box body 1 are provided with guide ramps 10, and the bottom of the box body 1 is provided with a screw conveyor 9.

[0049] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A crushing device, characterized in that The utility model provides a kind of material crushing device, including box (1), the side of the top end of the box (1) is provided with feed inlet (2), two crushing rollers (3) are installed in the box (1), the drive device (7) for driving two crushing rollers (3) rotation is installed in the side of the box (1), one end of the crushing roller (3) is below feed inlet (2), the diameter of two crushing rollers (3) gradually increases from one end of feed inlet (2) to the other end, the axis of two crushing rollers (3) is parallel, flexible cylindrical screen (4) is provided in the box (1), two crushing rollers (3) are located inside cylindrical screen (4), the inner wall of the cylindrical screen (4) is provided with the same length as the bending material baffle (5) of cylindrical screen (4), the motion device (8) for making cylindrical screen (4) motion is installed in the box (1), two crushing rollers (3) are provided with the feeding assembly (6) for making material fall in the direction of moving away from feed inlet (2) a distance; The bending material baffle (5) includes a support rod (51) arranged along the length direction of the cylindrical screen (4), the support rod (51) is fixedly connected with a bending plate (52), and a tangent line of the support rod (51) as a tangent point on the cylindrical screen (4) is parallel to the bending segment of the bending plate (52) away from the support rod (51). The motion device (8) includes a guide assembly (81) for maintaining a fixed shape when the cylindrical screen (4) moves and a drive assembly (82) for moving the cylindrical screen (4). The guide assembly (81) includes a plurality of flexible steel belts (811) arranged on the cylindrical screen (4) for connecting all the support rods (51), the flexible steel belts (811) are provided with sliding blocks (812) at equal intervals, the box (1) is fixedly connected with a closed-loop sliding rail (813), the sliding blocks (812) can slide on the closed-loop sliding rail (813), and the middle part of the top of the closed-loop sliding rail (813) is concave downward.

2. The crushing device according to claim 1, characterized in that The drive device (7) includes two gears (71) coaxially installed with the two crushing rollers (3), respectively, the two gears (71) are engaged, and one of the gears (71) is provided with a speed reducer motor (72) for driving the rotation thereof.

3. The crushing device according to claim 2, characterized in that The drive assembly (82) includes a closed-loop drive belt (821) fixedly connected to the outer surface of the cylindrical screen (4), the top of the cylindrical screen (4) is provided with a rotating roller (822), the rotating roller (822) is fixedly installed with a drive wheel (823) in transmission connection with the drive belt (821), and one end of the rotating roller (822) is in transmission connection with the gear (71) through a gear set (824).

4. The crushing device according to claim 1, characterized in that The feeding assembly (6) includes a plurality of inclined plates (61) arranged at equal intervals below the two crushing rollers (3), the projections of all the inclined plates (61) on the horizontal plane have overlapping portions, the box (1) is fixedly connected with a connecting plate (62), and the inclined plates (61) are fixedly installed on the connecting plate (62).

5. The crushing device according to claim 3, characterized in that The rotating roller (822) is a hollow structure, and a blowing hole (8221) is arranged on the rotating roller (822), and one end of the rotating roller (822) is connected with a gas pump (11) through a rotating joint.

6. The crushing device of claim 1, wherein Both ends of the box body (1) are provided with material guide inclined surfaces (10), and the bottom of the box body (1) is provided with a spiral discharging machine (9).

7. A method for preparing calcium aluminate by high-temperature calcination using aluminum ash, characterized by, The method comprises the following steps: Step one: limestone and aluminum ash are respectively crushed into two raw materials by the crushing device according to any one of the preceding claims 1-6; Step two: the two raw materials are mixed according to a certain proportion and then sent into a ball mill to be ground into powder materials; Step three: the powder materials are sent into a rotary kiln to be calcined, the calcination temperature is 1300-1400 DEG C, and a calcium aluminate product is obtained after sintering and cooling.

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