Device and method for producing cubic building material skeleton material by using industrial waste red mud

Abstract

The application relates to a device and a method for producing cubic building material skeleton materials by using industrial waste red mud, and belongs to the technical field of renewable resource utilization. The device comprises a spiral extruder, a core frame and porcelain heads, wherein the core frame is arranged at a discharging port of a machine head of the spiral extruder, and a plurality of porcelain heads are arranged on the core frame. The application first proposes that the red mud is applied to the infrastructure, at present, cement, bricks, tiles, steel and other materials are mostly used in the infrastructure, the cost is high, and additional production materials are needed, and the application converts the industrial waste red mud into the building material skeleton materials to fill the infrastructure site, so that the storage management difficulty and the environmental risk of the red mud are solved, and the infrastructure cost is reduced.

Description

Technical Field

[0001] This invention relates to an apparatus and method for producing cubic building material skeleton material using industrial waste red mud, belonging to the technical field of bulk solid waste disposal and renewable resource utilization. Background Technology

[0002] Currently, my country has a large amount of red mud, a waste residue generated during the electrolytic aluminum production process. The output of red mud varies depending on the type of ore, process route, and technical level. Most production plants produce 1.0 to 1.5 tons of red mud for every ton of alumina produced. With the annual increase in alumina production and the gradual decrease in bauxite grade, the annual output of red mud will continue to increase. The accumulated red mud not only occupies a large amount of land, but its alkaline substances will also pollute the environment, affecting the drinking water of surrounding residents and crops. Therefore, the management of red mud stockpiling is becoming increasingly difficult and poses greater environmental risks. At the same time, the stockpiling of red mud incurs significant transportation costs, stockpile construction and maintenance costs, seriously affecting and restricting the ecological environment.

[0003] Currently, there are various ways to reduce and utilize red mud, such as the method and system for the resource utilization of large-scale industrial solid waste red mud disclosed in Chinese patent document CN118598554A. However, due to its small scale, it is undoubtedly a drop in the ocean compared to the hundreds of millions of tons of existing stock and the tens of millions of tons of new stock each year. Moreover, most of these methods have not solved the problem of secondary pollution from heavy metals. Therefore, the resource utilization of large-scale red mud has always been a difficult problem to be solved in the industry. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an apparatus and method for producing cubic building material skeleton material from industrial waste red mud. This method transforms industrial waste red mud into cubic building material skeleton material, which can be used as a comprehensive foundation material for large-scale infrastructure projects, or as a skeleton material and filler for concrete (reinforced concrete), thus solving the problems of red mud storage management and secondary environmental pollution during reuse.

[0005] The technical solution of the present invention is as follows:

[0006] An apparatus for producing cubic building material skeleton material using industrial waste red mud includes a screw extruder, a compressor head, a core frame, ceramic heads, a strip cutter and a wire cutter. The compressor head is provided on the discharge side of the screw extruder, and the core frame is provided in the discharge port of the compressor head. Several ceramic heads are provided on the core frame.

[0007] A strip cutter and a wire cutter are sequentially installed on the discharge side of the screw extruder. The strip cutter is used to cut the continuous mud strips extruded by the screw extruder, and the wire cutter is used to cut the mud strips so that the inside is a shape with several cubes evenly arranged. The thickness of the adjacent joint of the cubes on the cross-section of the mud strip is the breaking point of the mud strip. By controlling this thickness dimension, the mud strip is broken by collision.

[0008] According to a preferred embodiment of the present invention, a corresponding ceramic head is configured according to the required cube side length of the product, and the wire spacing of the wire cutter is equal to the side length of the cube.

[0009] According to a preferred embodiment of the present invention, the core frame includes a frame body and support rods. The frame body is a mesh support frame. Several rows of support rods are arranged vertically on one side of the frame body. Each support rod is provided with a ceramic head. Adjacent rows of ceramic heads are arranged alternately, so that four ceramic heads form a square hollow. When in use, the ceramic heads on the side cooperate with the discharge port of the compressor head to form a square hollow as well, so that the multiple solid small clay strips extruded inside the entire clay strip are square.

[0010] According to a preferred embodiment of the present invention, the thickness of the adjacent joint of the cube on the cross-section of the clay strip is 1 / 10 to 1 / 7 of the side length of the cube. The specific thickness can be adjusted according to the actual sintering environment, actual size, etc., to meet the crushing conditions of the cube products produced in the subsequent square hollow.

[0011] According to a preferred embodiment of the present invention, the ceramic head has a conical structure with a rectangular bottom surface, and a threaded hole is provided inside the ceramic head. The ceramic head is fixed to the support rod through the threaded hole and bolts.

[0012] The above-mentioned apparatus for producing cubic building material skeleton material using industrial waste red mud is used in the following method for producing building material skeleton material:

[0013] (1) Red mud and crushed coal gangue are mixed to form raw materials for making blanks;

[0014] (2) The raw material for blank preparation is fed into the screw extruder, and after passing through the compressor head, core frame and ceramic head, it is extruded into a clay strip with holes;

[0015] (3) Use a strip cutter and a wire cutter to cut the clay strips into multiple cubes connected together to form a suitable stackable blank, and place it on the kiln car of the tunnel kiln. During the drying and sintering process, due to the different shrinkage stress, this blank can naturally form the required cubic infrastructure material after sintering.

[0016] (4) The residual heat of coal gangue is used to complete the roasting through the tunnel kiln. By adjusting the sintering temperature and time, materials with different properties can be obtained to meet the needs of various infrastructure materials fillers.

[0017] (5) The roasted product is transported to the construction site and crushed to obtain standard-sized building material skeleton material.

[0018] According to a preferred embodiment of the present invention, the holes on the clay strip obtained in step (2) are left when the porcelain head passes through, penetrating the entire clay strip. Multiple solid clay strips inside the entire clay strip correspond to square hollows, which are subsequently crushed in step (5) to become cubic building material skeletons.

[0019] According to a preferred embodiment of the present invention, in step (5), the crushing process is as follows: after the product is transported to the construction site, it is directly poured into the construction site. After the product is fired, it falls and, under the impact of gravity, the gap between the holes (corresponding to the gap between the ceramic heads) breaks, causing it to break into cubic building material skeletons.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. This invention transforms industrial waste red mud into cubic building material skeleton material, which can be used as a comprehensive foundation material for large-scale infrastructure projects, and can also replace gravel as a skeleton material and filler for concrete, thus solving the problems of red mud storage management and secondary environmental pollution in reuse.

[0022] 2. This invention innovatively designs the building material skeleton as a cubic structure. After the cubic structure is broken and falls into the construction site, it can fit together better, making the construction site more compacted and stable.

[0023] 3. In order to facilitate the production and transportation of cubic building material skeleton materials, this invention designs a core frame and ceramic head structure. The core frame and ceramic head are used to form regularly arranged holes in the fired product. The hole structure not only facilitates the subsequent crushing into cubic building material skeleton materials, but more importantly, the gaps between the holes will accumulate stress during the early extrusion molding and firing processes, which can make the subsequent collision crushing process easier and ensure the crushing effect. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a perspective view of the core frame structure of the present invention;

[0026] Figure 3 This is a top view of the core frame structure of the present invention;

[0027] Figure 4 This is a side view of the core frame structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the ceramic head structure of the present invention, wherein, Figure 5 (a) is a bottom view; Figure 5 (b) is a top view; Figure 5 (c) is the front view; Figure 5 (d) is a side view;

[0029] Figure 6 This is a schematic diagram of the product after roasting in step (4) of the present invention.

[0030] Among them: 1. Screw extruder; 2. Core frame; 3. Ceramic head; 4. Compressor head; 5. Discharge port; 6. Gap; 7. Square hollow; 8. Threaded hole; 9. Hole;

[0031] 21. Frame; 22. Support rod. Detailed Implementation

[0032] The present invention will be further described below with reference to the embodiments and accompanying drawings, but is not limited thereto.

[0033] Example 1:

[0034] like Figures 1-6 As shown, this embodiment provides an apparatus for producing cubic building material skeleton material using industrial waste red mud, including a screw extruder 1, a compressor head 4, a core frame 2, ceramic heads 3, a strip cutter and a wire cutter. The screw extruder 1 is provided with a compressor head 4 on the discharge side, and a core frame 2 is provided in the discharge port 5 of the compressor head 4. Several ceramic heads are provided on the core frame 2.

[0035] On the discharge side of the screw extruder 1, there are a strip cutter and a wire cutter. The strip cutter is used to cut the continuous mud strips extruded by the screw extruder, and the wire cutter is used to cut the mud strips so that the inside is a shape with several cubes evenly arranged. The thickness of the adjacent joint of the cubes on the cross-section of the mud strip is the breaking point of the mud strip. By controlling this thickness dimension, the mud strip is broken by collision.

[0036] Based on the required cube side length of the product, configure the corresponding ceramic head 3, and the wire spacing of the wire cutter is equal to the side length of the cube.

[0037] The core frame 2 includes a frame body 21 and support rods 22. The frame body 21 is a mesh support frame. Several rows of support rods 22 are arranged vertically on one side of the frame body 21. Each support rod 22 is equipped with a ceramic head 3. The adjacent rows of ceramic heads 3 are staggered, so that the four ceramic heads form a square hollow. When the ceramic heads on the side are used, they are matched with the discharge port of the compressor head to form a square hollow 7, so that the multiple solid small clay strips extruded inside the entire clay strip are square.

[0038] The thickness of the adjacent joint of the cube on the cross-section of the clay strip (i.e., the gap 6 between the ceramic heads 3) is 1 / 10 of the side length of the cube. The specific thickness can be adjusted according to the actual sintering environment, actual size, etc., to meet the crushing conditions of the cube products produced in the subsequent square hollow.

[0039] The ceramic head 3 has a conical structure with a rectangular bottom. The ceramic head 3 has a threaded hole 8 inside, and the ceramic head 3 is fixed to the support rod 22 through the threaded hole 8 and the bolt.

[0040] The above-mentioned apparatus for producing cubic building material skeleton material using industrial waste red mud is used in the following method for producing building material skeleton material:

[0041] (1) Red mud and crushed coal gangue are mixed to form raw materials for making blanks;

[0042] (2) The raw material for blanking is fed into the screw extruder. After passing through the core frame and the porcelain head, the clay strip with holes is extruded. The holes on the clay strip are left when the porcelain head passes through, penetrating the entire clay strip. The multiple solid clay strips inside the entire clay strip correspond to square hollows. After being crushed in step (5), they become cubic building material skeletons.

[0043] (3) Use a strip cutter and a wire cutter to cut the clay strips into multiple cubes connected together to form a suitable stackable blank, and place it on the kiln car of the tunnel kiln. During the drying and sintering process, due to the different shrinkage stress, this blank can naturally form the required cubic infrastructure material after sintering.

[0044] (4) The residual heat of coal gangue is used to complete the roasting through the tunnel kiln. By adjusting the sintering temperature and time, materials with different properties can be obtained to meet the needs of various infrastructure materials fillers.

[0045] (5) The roasted product is transported to the construction site and crushed to obtain standard-sized building material skeleton material;

[0046] The crushing process is as follows: after the product is transported to the construction site, it is poured directly into the infrastructure site. After being fired, the product falls and, under the impact of gravity, the gaps between the holes (corresponding to the gaps between the ceramic heads) break, causing it to break into cubic building material skeletons.

[0047] This embodiment transforms industrial waste red mud into cubic building material skeleton material, which can be used as a comprehensive foundation material for large-scale infrastructure projects, and can also replace gravel as a skeleton material and filler in concrete, solving the problems of red mud storage management and secondary environmental pollution during reuse. Furthermore, the innovative cubic structure of the building material skeleton material allows for better adhesion after crushing and falling onto the construction site, resulting in higher compaction and stability. Simultaneously, to facilitate the production and transportation of the cubic building material skeleton material, a core frame and ceramic head structure are designed. These components create regularly arranged holes in the fired product. This hole structure not only facilitates subsequent crushing into cubic building material skeleton material, but more importantly, the gaps between the holes accumulate stress during the initial extrusion molding and firing processes, making subsequent impact crushing easier and ensuring optimal crushing results.

[0048] Example 2:

[0049] This embodiment provides an apparatus for producing cubic building material skeleton material using industrial waste red mud. The structure is as described in Embodiment 1, except that the thickness of the adjacent joint of the cube on the cross-section of the mud strip is 1 / 7 of the side length of the cube.

[0050] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for producing cubic building material skeleton material using industrial waste red mud, characterized in that, It includes a screw extruder, a compressor head, a core frame, ceramic heads, a strip cutter, and a wire cutter. The screw extruder is equipped with a compressor head on its discharge side, and a core frame is installed inside the discharge port of the compressor head. Several ceramic heads are installed on the core frame. A strip cutter and a wire cutter are sequentially installed on the discharge side of the screw extruder. The strip cutter is used to cut the continuous mud strips extruded by the screw extruder, and the wire cutter is used to cut the mud strips so that the inside is a shape with several cubes evenly arranged. The thickness of the adjacent joint of the cubes on the cross-section of the mud strip is the breaking point of the mud strip. By controlling this thickness dimension, the mud strip is broken by collision. The core frame includes a frame and support rods. The frame is a mesh support frame. Several rows of support rods are arranged vertically on one side of the frame. Each support rod is equipped with a ceramic head. The ceramic heads of two adjacent rows are arranged alternately, so that the four ceramic heads form a square hollow. When in use, the ceramic heads on the side are matched with the discharge port of the compressor head to form a square hollow as well, so that the multiple solid small clay strips extruded inside the entire clay strip are square.

2. The apparatus for producing cubic building material skeleton material from industrial waste red mud as described in claim 1, characterized in that, The thickness of the adjacent joint of the cube on the cross-section of the clay strip is 1 / 10 to 1 / 7 of the side length of the cube.

3. The apparatus for producing cubic building material skeleton material from industrial waste red mud as described in claim 2, characterized in that, The wire spacing of a wire cutter is equal to the side length of a cube.

4. The apparatus for producing cubic building material skeleton material from industrial waste red mud as described in claim 1, characterized in that, The ceramic head has a conical structure with a rectangular bottom. The ceramic head has a threaded hole inside and is fixed to the support rod by means of the threaded hole and bolts.

5. The apparatus for producing cubic building material skeleton material from industrial waste red mud as described in claim 1, and the method for producing building material skeleton material, characterized in that, The steps are as follows: (1) Red mud and crushed coal gangue are mixed to form raw materials for making blanks; (2) The raw material for blank preparation is fed into the screw extruder, and after passing through the core frame and the ceramic head, it is extruded into a clay strip with holes; (3) Use a strip cutter and a wire cutter to cut the clay strips into multiple cubes connected together to form a stackable blank, and then stack it on the kiln car of the tunnel kiln. (4) The calcination is completed by using the residual heat of coal gangue in a tunnel kiln. By adjusting the sintering temperature and time, materials with different properties can be obtained. (5) The roasted product is transported to the construction site and crushed to obtain standard-sized building material skeleton material.

6. The apparatus for producing cubic building material skeleton material from industrial waste red mud as described in claim 5, and the method for producing building material skeleton material, are characterized in that... The holes on the clay strip obtained in step (2) are left when the porcelain head passes through, penetrating the entire clay strip. The multiple solid clay strips inside the entire clay strip correspond to square hollows, which are then crushed in step (5) to become cubic building material skeletons.

7. The apparatus for producing cubic building material skeleton material from industrial waste red mud as described in claim 5, and the method for producing building material skeleton material, are characterized in that... In step (5), the crushing process is as follows: after the product is transported to the construction site, it is directly poured into the infrastructure site. After the product is baked, it falls and the gap between the holes breaks under the impact of gravity, causing it to break into cubic building material skeletons.

Images