Sorting and preparing system for coal gangue aggregate

Abstract

The utility model discloses a sorting preparation system of coal gangue aggregate, including primary crushing and screening system, drying system equipment, intelligent concentrator, vibrating screen integrated winnower and aggregate bin, the primary crushing and screening system carries out crushing and screening pretreatment, through the drying system equipment drying, the intelligent concentrator removes harmful elements, and the vibrating screen integrated winnower removes the harmful elements. Coal gangue aggregates are subjected to winnowing according to different volume weights through the vibrating screen integrated winnowing machine, and are conveyed to the aggregate bins of the corresponding grades to be stored through the conveying belt and the hoister. Compared with the prior art, after the coal gangue aggregate is subjected to full-fraction screening pretreatment, carbon and harmful elements in the coal gangue aggregate are comprehensively sorted and enriched, the aggregate which meets the technical requirements of the coal gangue aggregate and has various grades, particle shapes and powder materials is prepared through mechanical crushing, shaping, screening and powder control, reasonable utilization of resources can be achieved, and the production cost is reduced. The purpose of environmental protection is achieved, and powerful support is provided for sustainable development of enterprises.

Description

Technical Field

[0001] This utility model relates to the field of coal gangue aggregate sorting equipment, and in particular to a coal gangue aggregate sorting and preparation system. Background Technology

[0002] Coal gangue aggregate is a large amount of industrial solid waste generated during coal mining and washing. It contains carbon, inorganic silicates, and kaolinite minerals. If it is not comprehensively utilized and is directly discharged or used for backfilling in mines, it will waste resources, occupy land, and cause air, water, and soil pollution. Related enterprises mostly use coal gangue aggregate for power generation, land reclamation through ditch filling, and brick making. Due to the lack of large-scale utilization methods and the large investment and small processing capacity of related processes such as calcination, it is difficult to fully utilize coal gangue aggregate from coal production and washing industries. The technology of using gangue as cement base material or roadbed stone is also in the early stages of industrialization. Mature cases of high-value, large-scale utilization of gangue are still rare. Therefore, exploring localized sorting and utilization of coal gangue aggregate, especially sorting based on its crushing index and overall component characteristics, is of great significance to the green, low-carbon, and circular development of the coal industry. Utility Model Content

[0003] The purpose of this invention is to provide a coal gangue aggregate sorting and preparation system. By rationally selecting equipment and using a scientific sorting process, the sorting efficiency can be effectively improved, production costs reduced, economic value maximized, and zero pollution emissions achieved. The system can also produce aggregates with various gradations, particle shapes, and powders that meet the technical requirements of coal gangue aggregates.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a coal gangue aggregate sorting and preparation system, including a primary crushing and screening system, a drying system, an intelligent mineral processing machine, a vibrating screen integrated air separator, and a sand making system. The primary crushing and screening system transports the crushed and screened coal gangue aggregate to the drying system via a conveyor belt. The drying system transports the dried coal gangue aggregate to the intelligent mineral processing machine via an elevator. The intelligent mineral processing machine is mounted above the vibrating screen integrated air separator, and its discharge end is connected to the inlet of the vibrating screen integrated air separator. The vibrating screen integrated air separator performs air separation of the coal gangue aggregate according to different bulk densities. There are multiple sand making systems, and the vibrating screen integrated air separator transports the air-separated coal gangue aggregate to the corresponding sand making system.

[0005] Preferably, the primary crushing and screening system consists of a storage bin, a fish-scale plate feeder, a double-toothed roll crusher, a feeding conveyor belt, and a vibrating screen. The feed end of the fish-scale plate feeder is located below the discharge port of the storage bin, and its discharge end is located above the feed port of the double-toothed roll crusher. The discharge port of the double-toothed roll crusher is located above the feed end of the feeding conveyor belt, and the discharge end of the feeding conveyor belt is connected to the feed port of the vibrating screen.

[0006] Preferably, the vibrating screen is a multi-stage vibrating screen, and the screening particle size of the vibrating screen is 30mm-15mm, 15mm-4.75mm, ≤4.75mm and >30mm.

[0007] Preferably, the system also includes a vertical compound crusher and a return conveyor belt. The feed end of the return conveyor belt is located below the discharge port of the coal gangue particles with a particle size >30mm on the vibrating screen, the discharge end of the return conveyor belt is located above the feed port of the vertical compound crusher, and the discharge port of the vertical compound crusher is located above the feeding conveyor belt.

[0008] Preferably, the system also includes a coal bunker and a sulfur bunker. The intelligent mineral processing machine screens the carbon-containing coal gangue aggregate and the sulfur-containing and sulfate-containing coal gangue aggregate. The screened carbon-containing coal gangue aggregate is transported to the coal bunker through a conveying pipeline, and the screened sulfur-containing and sulfate-containing coal gangue aggregate is transported to the sulfur bunker through a conveying pipeline. The remaining coal gangue aggregate is transported to the integrated vibrating screen air separator through the discharge end at the bottom.

[0009] Preferably, the integrated vibrating screen air classifier separates coal gangue aggregates into four bulk densities: <13.5, 1.35-1.55, 1.55-2.0, and >2.0. The sand making system has three sets, and the integrated vibrating screen air classifier transports the three types of coal gangue aggregates with bulk densities of 1.35-1.55, 1.55-2.0, and >2.0 to the corresponding sand making systems through conveying pipelines.

[0010] Preferably, the system also includes a collection bin, into which the integrated vibrating screen and air separator transports coal gangue aggregate with a bulk density of <13.5 to the collection bin via a conveying pipeline.

[0011] Preferably, the sand making system consists of a sand making machine, a vibrating screen a, a non-powered air classifier, a probability screen, and a finished product conveyor belt. The integrated vibrating screen air classifier transports coal gangue aggregate to the sand making machine through a conveying pipeline. The discharge port of the sand making machine is connected to the inlet of the vibrating screen a through a conveying pipeline. The discharge port of the vibrating screen a is connected to the inlet of the non-powered air classifier through a conveying pipeline. The non-powered air classifier uses an elevator to transport the classified coal gangue aggregate to the probability screen for screening. The finished product screened by the vibrating screen a, the non-powered air classifier, and the probability screen is transported to the finished product workshop via the finished product conveyor belt.

[0012] Compared with existing technologies, the advantages of this utility model are as follows: The coal gangue aggregate of this utility model is mainly produced by pre-treating the coal gangue aggregate through full-size screening, comprehensively separating and enriching carbon and harmful elements in the coal gangue aggregate. Through mechanical crushing, shaping, screening, and powder control processes, aggregates with various gradations, particle shapes, and powders that meet the technical requirements of coal gangue aggregate are prepared. The separation of coal gangue aggregate is of great significance to coal mining enterprises, not only enabling the rational utilization of resources but also achieving environmental protection goals. Through reasonable equipment selection and scientific separation processes, separation efficiency can be effectively improved, production costs reduced, and economic value maximized, achieving zero pollution emissions and providing strong support for the sustainable development of enterprises. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the complete system equipment of this utility model;

[0014] Figure 2 This is a top view of the complete system equipment of this utility model.

[0015] In the diagram: 1. Primary crushing and screening system; 11. Storage silo; 12. Fish scale plate feeder; 13. Double toothed roller crusher; 14. Vertical compound crusher; 15. Return conveyor belt; 16. Feeding conveyor belt; 17. Vibrating screen; 2. Drying system equipment; 3. Intelligent mineral processing machine; 4. Vibrating screen integrated air classifier; 5. Sand making system; 51. Sand making machine; 52. Vibrating screen a; 53. Non-powered air classifier; 54. Probability screen; 55. Finished product conveyor belt; 6. Collection silo; 7. Sulfur silo; 8. Coal silo. Detailed Implementation

[0016] Coal gangue aggregates can be classified into high-calorific-value coal gangue aggregates, low-calorific-value coal gangue aggregates, high-sulfur coal gangue aggregates, and low-sulfur coal gangue aggregates based on their carbon content and sulfide and sulfate content.

[0017] Among them, high-calorific-value coal gangue aggregate can be sold directly as a product to generate economic value; high-sulfur coal gangue is separated by intelligent air separation equipment. The high-sulfur coal gangue separated by air can be enriched for use as sulfuric acid or as a soil remediation agent, directly generating economic value.

[0018] Low-calorific-value coal gangue aggregates and low-sulfur coal gangue aggregates cannot be directly converted into economic value and require further processing. Therefore, this utility model proposes a coal gangue aggregate sorting and preparation system.

[0019] Before sorting, the coal gangue aggregate is sampled and analyzed to obtain the sulfide and sulfate content, carbon content and bulk density of the raw material. The coal gangue aggregate is imaged according to the different carbon content and sulfide and sulfate content using an X-ray imager, and a sorting model is established to facilitate sorting by the intelligent mineral processing machine.

[0020] The present invention will be further described below: a coal gangue aggregate sorting and preparation system, see [link to relevant documentation]. Figure 1 and Figure 2 The system includes a primary crushing and screening system 1, a drying system 2, an intelligent mineral processing machine 3, a vibrating screen integrated air separator 4, and a collection bin 6. The primary crushing and screening system 1 transports the crushed and screened coal gangue aggregate to the drying system 2 via a conveyor belt. The drying system 2 transports the dried coal gangue aggregate to the intelligent mineral processing machine 3 via an elevator. The intelligent mineral processing machine 3 is mounted above the vibrating screen integrated air separator 4, and its discharge end is connected to the inlet of the vibrating screen integrated air separator 4. The vibrating screen integrated air separator 4 performs air separation of the coal gangue aggregate according to different bulk densities. There are multiple sand making systems 5, and the vibrating screen integrated air separator 4 transports the air-separated coal gangue aggregate to the corresponding sand making system 5.

[0021] This utility model uses a primary crushing and screening system 1 to pre-treat coal gangue raw materials by crushing and screening, and screens out coal gangue aggregates with particle sizes of 30mm-15mm and 15mm-4.75mm that meet the requirements. After being dried by the drying system equipment 2, the coal gangue aggregates of 30mm-15mm and 15mm-4.75mm are transported to the intelligent mineral processing machine 3.

[0022] The primary crushing and screening system 1 consists of a storage bin 11, a fish scale plate feeder 12, a double toothed roll crusher 13, a feeding conveyor belt 16, and a vibrating screen 17. The feed end of the fish scale plate feeder 12 is located below the discharge port of the storage bin 11, and its discharge end is located above the feed port of the double toothed roll crusher 13. The discharge port of the double toothed roll crusher 13 is located above the feed end of the feeding conveyor belt 16, and the discharge end of the feeding conveyor belt 16 is connected to the feed port of the vibrating screen 17. The vibrating screen 17 is a multi-stage vibrating screen, which can screen particle sizes of 30mm-15mm, 15mm-4.75mm, ≤4.75mm, and >30mm. Among them, the two types of coal gangue aggregates with particle sizes of 30mm-15mm and 15mm-4.75mm are conveyed to the next stage of processing; the coal gangue aggregate with a particle size of ≤4.75mm, if the calorific value is above 2500 kcal, can be sold as raw ore without further processing; if the calorific value is below 2500 kcal, it can be used as low-grade filler in the configuration; the coal gangue aggregate with a particle size of >30mm is returned material for secondary crushing.

[0023] To achieve secondary crushing of coal gangue aggregate with a particle size > 30mm, a vertical compound crusher 14 and a return conveyor belt 15 are also included. The feed end of the return conveyor belt 15 is located below the discharge port of the vibrating screen 17 for coal gangue particles with a particle size > 30mm. The discharge end of the return conveyor belt 15 is located above the feed port of the vertical compound crusher 14. The discharge port of the vertical compound crusher 14 is located above the feeding conveyor belt 16.

[0024] The intelligent mineral processing machine 3 sorts the dried coal gangue aggregate, removing coal gangue aggregate containing carbon and sulfur harmful elements, and separating clean coal gangue aggregate. Based on the different imaging of mineral spots under X-rays according to the carbon content, sulfide and sulfate content in the coal gangue aggregate, coal gangue aggregate with carbon content has dark black mineral spots, while coal gangue with sulfide and sulfate content has light black mineral spots and light blue mineral spots. The intelligent mineral processing machine 3 can classify and identify coal gangue aggregate through X-rays, and separate the coal gangue aggregate containing carbon and sulfur by blowing. The coal gangue containing sulfides and sulfates, which is blown out, is sent to the soil conditioner and pesticide workshops for recycling. The carbonaceous coal gangue, which is blown out, is sent to coal bunker 8 for sale. Furthermore, the intelligent mineral processing machine 3 can screen the coal and pyrite mixed in the coal gangue aggregate; the screened coal can be sold, and the pyrite can be used to produce sulfuric acid. The clean coal gangue aggregate is then conveyed to the integrated vibrating screen and air separator 4 for further processing.

[0025] It also includes a coal bunker 8 and a sulfur bunker 7. The intelligent mineral processing machine 3 screens the carbon-containing coal gangue aggregate and the sulfur-containing and sulfate-containing coal gangue aggregate in the coal gangue aggregate. The screened carbon-containing coal gangue aggregate is transported to the coal bunker 8 through a conveying pipeline, and the screened sulfur-containing and sulfate-containing coal gangue aggregate is transported to the sulfur bunker 7 through a conveying pipeline. The carbon-containing coal gangue aggregate and the sulfur-containing coal gangue aggregate separated by the intelligent mineral processing machine 3 can be stored through the coal bunker 8 and the sulfur bunker 7.

[0026] The integrated vibrating screen and air separator 4 can sort clean coal gangue aggregates according to their bulk density grades. These bulk density grades are divided into four levels: <1.35, 1.35-1.55, 1.55-2.0, and >2.0. During operation, the integrated vibrating screen and air separator uniformly receives clean coal gangue aggregates via a vibrating feeder and performs particle size vibration separation and bulk density air separation. Gravity vibration screening is applied to the 30mm-15mm and 15mm-4.75mm particle sizes, with screen sizes of 30mm-25mm, 25mm-20mm, 20mm-15mm, 15mm-9mm, and 9-4.75mm respectively. Furthermore, based on the different bulk densities of the coal gangue aggregates, four-stage air separation is performed according to bulk densities of <1.35, 1.35-1.55, 1.55-2.0, and >2.0. Among them, materials with a bulk density <1.35 are tested for calorific value and harmful elements such as sulfate. If the calorific value exceeds 1000 kcal, they can be sent to the coal blending bunker 8; if the calorific value does not exceed 1000 kcal, they can be sent to the soil conditioner preparation workshop. This utility model, through bulk density sorting process, classifies coal gangue aggregate products into different bulk density grades, maximizing their economic value and meeting the needs of different application scenarios.

[0027] The integrated vibrating screen air classifier 4 separates coal gangue aggregates into four bulk densities: <13.5, 1.35-1.55, 1.55-2.0, and >2.0. The sand making system 5 has three sets. The integrated vibrating screen air classifier 4 transports the three types of coal gangue aggregates with bulk densities of 1.35-1.55, 1.55-2.0, and >2.0 to the corresponding sand making system 5 via conveying pipes. It also includes a collection bin 6, where the integrated vibrating screen air classifier transports coal gangue aggregates with a bulk density <13.5 to the collection bin 6 for storage via conveying pipes.

[0028] The sand making system 5 consists of a sand making machine 51, a vibrating screen a52, a non-powered air classifier 53, a probability screen 54, and a finished product conveyor belt 55. The integrated vibrating screen air classifier 4 transports coal gangue aggregate to the sand making machine 51 through a conveying pipe. The discharge port of the sand making machine 51 is connected to the inlet of the vibrating screen a52 through a conveying pipe. The discharge port of the vibrating screen a52 is connected to the inlet of the non-powered air classifier 53 through a conveying pipe. The non-powered air classifier 53 transports the classified coal gangue aggregate to the probability screen 54 for screening through an elevator. The finished product screened by the vibrating screen a52, the non-powered air classifier 53, and the probability screen 54 is transported to the finished product workshop via the finished product conveyor belt 55. The sand making system 5 crushes and screens coal gangue aggregates with a bulk density ≥1.35 according to their bulk density grades. The specific method is as follows: The integrated vibrating screen and air classifier 4 transports coal gangue aggregates with bulk densities of 1.35-1.55, 1.55-2.0, and >2.0 to the corresponding sand making system 5. The sand making machine 51 crushes the coal gangue aggregates to below 2.36mm, and then sequentially passes them through a vibrating screen a52, a non-powered air classifier 53, and a probability screen 54 for multiple screenings. The function of the vibrating screen a52 is to screen out coal gangue aggregates larger than 2.36mm and return them to the sand making machine 51 for secondary crushing, ensuring that all coal gangue aggregates are crushed to below 2.36mm. The non-powered air classifier 53 screens out coal gangue powder aggregate products with a particle size <200 mesh. The probability screen 54 performs multi-stage screening to obtain coal gangue aggregate products with different particle sizes: 20-40 mesh, 40-70 mesh, 70-120 mesh, and 120-200 mesh. A total of 15 categories of coal gangue aggregates with different particle sizes and densities can be separated from the three different densities of coal gangue aggregates. During the use of the aggregates, users can select the appropriate category of aggregate products according to the actual mixing ratio requirements. Among them, coal gangue aggregate with a mesh size of 200 or larger can be used to prepare various building materials such as finished concrete, mortar, and road stabilized soil; coal gangue aggregate powder with a mesh size of less than 200 can be used as roadbed filler, building filler, and as a soil conditioner.

[0029] Through the above sorting process, coal gangue can be effectively separated into a variety of useful aggregate products, maximizing economic value. It can be further used in production and rationally processed, achieving complete utilization of waste, producing no polluting waste, and reducing environmental pollution. Through a scientific sorting implementation plan, coal mining enterprises can achieve rational utilization of resources while also achieving environmental protection goals.

[0030] The above provides a detailed description of the coal gangue aggregate sorting and preparation system provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, based on the idea of ​​this utility model, there will be changes in the specific implementation and application scope. Changes and improvements to this utility model are possible without exceeding the concept and scope specified in the appended claims. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A sorting and preparation system for coal gangue aggregate, characterized in that: The system includes a primary crushing and screening system, a drying system, an intelligent mineral processing machine, a vibrating screen integrated air separator, and a sand making system. The primary crushing and screening system transports the crushed and screened coal gangue aggregate to the drying system via a conveyor belt. The drying system then transports the dried coal gangue aggregate to the intelligent mineral processing machine via an elevator. The intelligent mineral processing machine is mounted above the vibrating screen integrated air separator, and its discharge end is connected to the inlet of the vibrating screen integrated air separator. The vibrating screen integrated air separator performs air separation of the coal gangue aggregate according to different bulk densities. There are multiple sand making systems, and the vibrating screen integrated air separator transports the air-separated coal gangue aggregate to the corresponding sand making system.

2. The coal gangue aggregate sorting and preparation system according to claim 1, characterized in that: The primary crushing and screening system consists of a storage bin, a fish-scale plate feeder, a double-toothed roll crusher, a feeding conveyor belt, and a vibrating screen. The feed end of the fish-scale plate feeder is located below the discharge port of the storage bin, and its discharge end is located above the feed port of the double-toothed roll crusher. The discharge port of the double-toothed roll crusher is located above the feed end of the feeding conveyor belt, and the discharge end of the feeding conveyor belt is connected to the feed port of the vibrating screen.

3. The coal gangue aggregate sorting and preparation system according to claim 2, characterized in that: The vibrating screen is a multi-stage vibrating screen, and the screening particle size of the vibrating screen is 30mm-15mm, 15mm-4.75mm, ≤4.75mm and >30mm.

4. The coal gangue aggregate sorting and preparation system according to claim 3, characterized in that: It also includes a vertical compound crusher and a return conveyor belt. The feed end of the return conveyor belt is located below the discharge port of coal gangue particles with a particle size >30mm on the vibrating screen. The discharge end of the return conveyor belt is located above the feed port of the vertical compound crusher. The discharge port of the vertical compound crusher is located above the feeding conveyor belt.

5. The coal gangue aggregate sorting and preparation system according to claim 1, characterized in that: It also includes a coal bunker and a sulfur bunker. The intelligent mineral processing machine screens the carbon-containing coal gangue aggregate and the sulfur-containing and sulfate-containing coal gangue aggregate in the coal gangue aggregate. The screened carbon-containing coal gangue aggregate is transported to the coal bunker through a conveying pipeline, and the screened sulfur-containing and sulfate-containing coal gangue aggregate is transported to the sulfur bunker through a conveying pipeline. The remaining coal gangue aggregate is transported to the vibrating screen integrated air separator through the discharge end at the bottom.

6. The coal gangue aggregate sorting and preparation system according to claim 1, characterized in that: The integrated vibrating screen air classifier separates coal gangue aggregates into four bulk densities: <13.5, 1.35-1.55, 1.55-2.0, and >2.

0. The sand making system consists of three sets. The integrated vibrating screen air classifier transports the three types of coal gangue aggregates with bulk densities of 1.35-1.55, 1.55-2.0, and >2.0 to the corresponding sand making systems through conveying pipelines.

7. The coal gangue aggregate sorting and preparation system according to claim 6, characterized in that: It also includes a collection bin, where the integrated vibrating screen and air separator transports coal gangue aggregate with a bulk density of <13.5 to the collection bin via a conveying pipeline.

8. The coal gangue aggregate sorting and preparation system according to claim 1, characterized in that: The sand making system consists of a sand making machine, a vibrating screen a, a non-powered air classifier, a probability screen, and a finished product conveyor belt. The integrated vibrating screen air classifier transports coal gangue aggregate to the sand making machine through a conveying pipeline. The discharge port of the sand making machine is connected to the inlet of the vibrating screen a through a conveying pipeline. The discharge port of the vibrating screen a is connected to the inlet of the non-powered air classifier through a conveying pipeline. The non-powered air classifier uses an elevator to transport the classified coal gangue aggregate to the probability screen for screening. The finished product screened by the vibrating screen a, the non-powered air classifier, and the probability screen is transported to the finished product workshop via the finished product conveyor belt.

Images