Industrial waste residue composite cementing material preparation system

Abstract

The utility model discloses an industrial waste residue composite cementing material preparation system which comprises a first calcining furnace, a kaolin feeding hole and a bauxite feeding hole are formed in the first calcining furnace, the first calcining furnace is connected with a first mixing kettle, and a coal ash feeding hole and a 10% sodium hydroxide solution feeding hole are formed in the first mixing kettle; the outlet end of the second calcining furnace is connected with the inlet end of the dehydrating tower, the outlet end of the dehydrating tower is connected with the inlet end of the second calcining furnace, the second calcining furnace is provided with a sodium dihydrogen phosphate feed port and a urea feed port, and the second calcining furnace is connected with the second mixing kettle; the second mixing kettle is provided with a red mud feeding hole, a coal gangue feeding hole, a metallurgical slag feeding hole and a glass water feeding hole; and the second mixing kettle is sequentially connected with the air furnace, the grinding kettle and the finished product bin. According to the utility model, the stockpiling of industrial solid wastes can be reduced, the environmental pollution can be effectively reduced, and the problem of infrastructure material shortage can be effectively relieved on the premise of ensuring the engineering quality.

Description

Technical Field

[0001] This utility model relates to the field of resource recycling technology for industrial solid waste, and in particular to a system for preparing composite cementitious materials from industrial waste residue. Background Technology

[0002] In recent years, with the development of urbanization and industrialization in China, a large amount of industrial waste, such as steel slag and fly ash, has been generated. Due to its low utilization rate, it has accumulated in large quantities, leading to a series of problems related to land, resources, environment, and safety. Meanwhile, emerging composite cementitious materials in the civil engineering field have advantages such as controllable setting time, superior performance, and a wide range of raw material sources. They can replace traditional silicate cement. If industrial waste can be used as raw material for their preparation, carbon dioxide emissions can be reduced, alleviating the land occupation and pollution caused by industrial waste. Summary of the Invention

[0003] To address the aforementioned problems, this utility model provides a system for preparing composite cementitious materials from industrial waste residue, specifically employing the following technical solution:

[0004] The industrial waste composite cementitious material preparation system of this utility model includes a first calcining furnace, which is provided with a kaolin inlet and a bauxite inlet. The outlet end of the first calcining furnace is connected to the inlet end of a first mixing vessel. The first mixing vessel is provided with a fly ash inlet and a 10% sodium hydroxide solution inlet. The outlet end of the first mixing vessel is connected to the inlet end of a dehydration tower. The outlet end of the dehydration tower is connected to the inlet end of a second calcining furnace. The second calcining furnace is provided with a sodium dihydrogen phosphate inlet and a urea inlet. The outlet end of the second calcining furnace is connected to the inlet end of a second mixing vessel. The second mixing vessel is provided with a red mud inlet, a coal gangue inlet, a metallurgical slag inlet, and a glass water inlet. The outlet end of the second mixing vessel is connected to the inlet end of a blast furnace. The outlet end of the blast furnace is connected to the inlet end of a grinding vessel. The outlet end of the grinding vessel is connected to the inlet end of a finished product silo.

[0005] The preparation system also includes a ball mill for grinding bauxite, kaolin and metallurgical slag. The outlet end of the ball mill is connected to the inlet end of a vibrating screen, and the final screen of the vibrating screen is a 46μm square hole screen.

[0006] A delivery pump is installed on the connecting pipe between the first mixing vessel and the dehydration tower.

[0007] A sampling port is provided at the outlet of the dehydration tower.

[0008] The outlet end of the vibrating screen is equipped with a belt conveyor connected to each silo.

[0009] The industrial waste composite cementitious material preparation system provided by this utility model has a reasonable structure and is easy to use. By designing a reasonable process route, adjusting the types and proportions of raw materials, and optimizing the equipment in each process, a low-energy-consumption and low-cost industrial waste cementitious material can be obtained. The prepared product has high strength and high durability. Compared with the cement manufacturing process, it can reduce carbon dioxide emissions by 30%-50%. It can be widely used as a substitute for traditional cement in traditional construction industries such as highway infrastructure, reducing carbon emissions generated during cement preparation. Since the raw materials are made from a variety of recycled industrial waste, it effectively alleviates the occupation and pollution of land by industrial waste, improves the resource recycling of industrial solid waste, not only reduces the accumulation of industrial solid waste and effectively reduces environmental pollution, but also effectively alleviates the shortage of basic construction materials while ensuring project quality. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0011] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific working processes. However, the protection scope of this utility model is not limited to the following embodiments.

[0012] like Figure 1 As shown, the industrial waste composite cementitious material preparation system of this utility model includes a first calcining furnace 1, which is equipped with a kaolin inlet and a bauxite inlet. The outlet end of the first calcining furnace 1 is connected to the inlet end of a first mixing vessel 2. The first mixing vessel 2 is equipped with a fly ash inlet and a 10% sodium hydroxide solution inlet. The outlet end of the first mixing vessel 2 is connected to the inlet end of a dehydration tower 3. A conveying pump 4 is installed on the pipeline connecting the first mixing vessel 2 and the dehydration tower 3. The outlet end of the dehydration tower 3 is connected to a second calcining furnace 5. The inlet of the dehydration tower 3 is connected to the outlet of the dehydration tower 3, and the outlet of the dehydration tower 3 is equipped with an alkali content sampling port. The second calcining furnace 5 is equipped with a sodium dihydrogen phosphate feed port and a urea feed port. The outlet of the second calcining furnace 5 is connected to the inlet of the second mixing vessel 6. The second mixing vessel 6 is equipped with a red mud feed port, a coal gangue feed port, a metallurgical slag feed port and a glass water feed port. The outlet of the second mixing vessel 6 is connected to the inlet of the blast furnace 7. The outlet of the blast furnace 7 is connected to the inlet of the grinding vessel 8. The outlet of the grinding vessel 8 is connected to the inlet of the finished product silo.

[0013] The industrial waste composite cementitious material preparation system of this utility model further includes a ball mill 9 for grinding bauxite, kaolin, and metallurgical slag. The outlet end of the ball mill 9 is connected to the inlet end of a vibrating screen 10. Typically, the final screen of the vibrating screen 10 is a 46μm square-hole screen. Furthermore, the vibrating screen 10 and each hopper are connected by a belt conveyor 11.

[0014] During operation, raw materials such as bauxite, kaolin, and metallurgical slag are first ground into powder using a ball mill 9 and then passed through a vibrating screen 10 until the residue rate on a 46μm square hole sieve reaches 10%. The qualified powder is then placed into various silos for later use. Afterwards, the industrial waste composite cementitious material is prepared according to the following steps: 1) The ground kaolin and bauxite are fed into the first calcining furnace 1 for roasting and activation for 3-6 hours, and then fed into the first mixing vessel 2; 2) A certain amount of fly ash and 10% sodium hydroxide solution are added to the first mixing vessel 2 and mixed evenly with the high-temperature calcined mixture in the vessel to form a mixed slurry, which is then sent to the dehydration tower 3 via a pump 4; 3) The mixed slurry is dehydrated in the dehydration tower 3, and a sample is taken at the outlet of the dehydration tower 3 to test whether the sodium hydroxide content meets the standard; 4) The dehydrated mixture with the sodium hydroxide content meeting the standard is sent to the first mixing vessel 2 for further processing. 5) After adding a certain amount of potassium dihydrogen phosphate and urea to the second calcining furnace 5, calcination and activation are carried out at high temperature for 3.5-4.5 hours; 6) The calcined mixture in the second calcining furnace 5 is transferred to the second mixing kettle 6. A certain amount of red mud and coal gangue are added and mixed evenly. Then a certain amount of glass water and metallurgical slag are added and mixed evenly. The mixture is then quickly transferred to the blast furnace 7; 7) Hot air at 800-900℃ is introduced into the blast furnace 7 to perform high-temperature air drying on the above materials. The materials are then sent to the grinding kettle 8; 8) The materials are ground in the grinding kettle 8 until the particle size is less than 200 mesh to obtain the finished composite cementitious material, which is then sent to the finished product silo for storage.

[0015] It should be noted that in the description of this utility model, terms such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", and "outer" indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A system for preparing composite cementitious materials from industrial waste residue, characterized in that: The system includes a first calcining furnace, which has a kaolin inlet and a bauxite inlet. The outlet of the first calcining furnace is connected to the inlet of a first mixing vessel. The first mixing vessel has a fly ash inlet and a 10% sodium hydroxide solution inlet. The outlet of the first mixing vessel is connected to the inlet of a dehydration tower. The outlet of the dehydration tower is connected to the inlet of a second calcining furnace. The second calcining furnace has a sodium dihydrogen phosphate inlet and a urea inlet. The outlet of the second calcining furnace is connected to the inlet of a second mixing vessel. The second mixing vessel has a red mud inlet, a coal gangue inlet, a metallurgical slag inlet, and a glass water inlet. The outlet of the second mixing vessel is connected to the inlet of a blast furnace. The outlet of the blast furnace is connected to the inlet of a grinding vessel. The outlet of the grinding vessel is connected to the inlet of a finished product silo.

2. The system for preparing industrial waste residue composite cementitious material according to claim 1, characterized in that: The preparation system also includes a ball mill for grinding bauxite, kaolin and metallurgical slag. The outlet end of the ball mill is connected to the inlet end of a vibrating screen, and the final screen of the vibrating screen is a 46μm square hole screen.

3. The system for preparing industrial waste residue composite cementitious material according to claim 1, characterized in that: A delivery pump is installed on the connecting pipe between the first mixing vessel and the dehydration tower.

4. The system for preparing industrial waste residue composite cementitious material according to claim 1, characterized in that: A sampling port is provided at the outlet of the dehydration tower.

5. The system for preparing industrial waste residue composite cementitious material according to claim 2, characterized in that: The outlet end of the vibrating screen is equipped with a belt conveyor connected to each silo.

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