Aluminum ash resource comprehensive utilization system and method

Abstract

The invention discloses an aluminum ash resource comprehensive utilization system and method.The aluminum ash resource comprehensive utilization system comprises a raw material processing system, a raw powder calcination system and a tail gas treatment system, the raw material processing system comprises a feeding device, a magnetic separation unit, a ball mill, a rolling screen and a conveying device, and the raw powder calcination system comprises a double-kiln-body rotary kiln, an additive bin, a pelletizer and a heat exchange device; the double-kiln-body rotary kiln comprises a preheating section, a transition section and a calcining section. Through the raw material processing system, the raw powder calcining system and the clinker processing system, useful components in the aluminum ash are used for preparing the refining slag, the process is simple, generation of hazardous waste is reduced, and recycling, harmlessness and benefit of the aluminum ash are achieved; in addition, the device further comprises a tail gas treatment system and a dust removal device, so that dust and harmful gas generated in the production process are treated, and environmental pollution is reduced.

Description

Technical Field

[0001] The present invention relates to the field of resource utilization, and in particular to a system and method for comprehensive resource utilization of aluminum ash slag. Background Art

[0002] Oil proppants are props that keep deep rocks in a cracked state, and are mainly used in deep well mining of oil and natural gas. When deep well mining of oil and natural gas, high closure pressure and low permeability ore beds are treated by fracturing, so that the oil-bearing rock formations are cracked, and oil and gas gather from the cracks. The propping material is used to enter the formation along with the high-pressure solution to fill the cracks in the rock formation, which can prevent the propping cracks from closing due to stress release, thereby maintaining high conductivity, allowing oil and gas to flow smoothly, and increasing production.

[0003] With the continuous development of my country's economy and society, domestic bauxite resources are facing depletion. According to the recoverable reserves, the static guarantee period of my country's bauxite is less than 10 years. A large amount of bauxite needs to be imported every year to make up for the shortage of domestic bauxite. This leads to the high cost of the preparation method of petroleum proppants using traditional bauxite as raw materials. On the other hand, a large amount of solid waste generated during the electrolytic aluminum, aluminum processing and recycled aluminum smelting process in my country mainly contains metallic aluminum, aluminum oxide, aluminum nitride and salts. The harmful components in the aluminum ash and residual ash are mainly hydrolyzed in water to produce ammonia, metal powder and metal nitride, and soluble fluoride salts that pollute the soil and water bodies and seriously pollute the environment.

[0004] The petroleum proppant prepared by using aluminum ash as raw material can effectively realize the comprehensive utilization of solid waste resources on the one hand, and can also prepare high value-added new material products on the other hand. The product has low density and high compressive strength, which can effectively solve the current problems of insufficient compressive strength and poor backflow ability. However, pollutants will still be generated during the recycling process, and the technical purpose of low-carbon, clean and resource utilization cannot be achieved.

[0005] In view of this, the inventor of this case conducted in-depth research on the above-mentioned issues, which resulted in this case. Summary of the invention

[0006] The purpose of the present invention is to provide a comprehensive utilization system of aluminum ash slag resources with high resource utilization, low pollution and high efficiency.

[0007] In order to achieve the above object, the present invention adopts such technical solution: A comprehensive utilization system of aluminum ash slag resources, including a raw material processing system, a raw powder calcination system and an exhaust gas treatment system; The raw material processing system includes a feeding device, a magnetic separation unit for magnetically separating and screening the aluminum ash slag in the feeding device, a ball mill for grinding the aluminum ash slag, a rolling screen for screening aluminum particles of different sizes in the ground aluminum ash slag, and a conveying device for transporting the aluminum ash slag in various devices, the discharge port of the feeding device is connected to the feed port of the ball mill, the discharge port of the ball mill is connected to the feed port of the rolling screen, and a recovery device for recovering the metal aluminum screened by the magnetic separation unit is provided at the bottom of the feeding device; The raw powder calcining system comprises a double-kiln rotary kiln, an additive silo, a granulator and a heat exchange device. The double-kiln rotary kiln comprises a preheating section, a transition section and a calcining section. The discharge port of the rolling screen is connected to the feed port of the additive silo through the conveying device and is conveyed to the granulator for stirring and extrusion. The discharge port of the granulator is connected to the feed port of the preheating section. The heat exchange device is connected to the transition section and conveys the heat of the preheating section to the calcining section. The tail gas outlet of the double-kiln rotary kiln is connected to the tail gas treatment system.

[0008] Furthermore, the preheating section and the calcining section are both cylindrical tubes with openings at both ends, a feed port is provided at the end of the preheating section, and the feed port is arranged at the end of the preheating section away from the transition section, a discharge port is provided at the end of the calcining section away from the transition section, the transition section is a cylindrical furnace shaft with a guide plate arranged inside, a first interface and a second interface are respectively arranged on the side walls of the furnace shaft, the first interface is arranged above the second interface, the preheating section is connected with the inner cavity of the furnace shaft through the first interface, and the calcining section is connected with the inner cavity of the furnace shaft through the second interface.

[0009] Furthermore, the feeding device, the rolling screen and the ball mill are all placed in a closed space, and the closed space is provided with a feeding port, a discharging port and a dust suction port, and the dust suction port is connected to a bag dust collector through a pipeline.

[0010] Furthermore, the exhaust gas treatment system includes a sedimentation spray tower, an alkali solution pool, an alkali solution circulation pump and a chimney. The sedimentation spray tower is divided into a lower sedimentation chamber and an upper spray chamber by a partition arranged in the middle. A plurality of baffles are arranged in a staggered manner in the sedimentation chamber. A first exhaust gas inlet is arranged on the lower side of the sedimentation chamber, a first exhaust gas outlet is arranged on the upper part, and a dust outlet is arranged on the lower bottom surface. A multi-layer nozzle is arranged on the upper part of the spray chamber, and alkali solution is stored in the lower part of the spray chamber. A second exhaust gas inlet is arranged on one side in the middle of the spray chamber, an alkali solution overflow port is arranged on the other side in the middle, and a second exhaust gas outlet is arranged on the top. The first exhaust gas outlet is connected to the second exhaust gas inlet through a pipeline, and the alkali solution overflow port is connected to the alkali solution inlet at the top of the alkali solution pool through a pipeline. The alkali solution circulation pump is connected to the nozzle through a pipeline, and the second exhaust gas outlet is connected to the smoke inlet at the bottom of the chimney through a pipeline.

[0011] Furthermore, the discharge port of the calcination section is provided with a device for recovering the fine aluminum ash 12-60 mesh granular aggregate after calcining the fine aluminum ash in the calcination section, and treating it through an aggregate cooling system to achieve vitrified 12-60 mesh granular aggregate, i.e., petroleum proppant. The harmful gas after calcination in the calcination section is treated through an exhaust gas treatment system.

[0012] Furthermore, the additive silo adds a composition of calcium oxide, aluminum oxide and silicon dioxide and stirs and mixes it with the aluminum ash sifted out by the rolling screen.

[0013] Furthermore, it also includes a drying system, which is connected to the additive silo, and the additive silo is added with sludge and slag dried by the drying system, and the drying system is connected to the heat exchange device.

[0014] A system process for comprehensive utilization of aluminum ash slag resources, comprising the following steps: Step 1: Add aluminum ash slag into a ball mill and grind it to a particle size of less than 150 meshes, that is, raw powder, which falls into a rolling screen to screen out metal aluminum particles; then add the finely crushed aluminum ash slag, calcium oxide, silicon dioxide, aluminum oxide, and iron oxide into the ball mill according to a certain proportion; the dust generated by the ball mill and the rolling screen is recovered by a bag dust collector; Step 2: The raw powder obtained in step 1 is put into a disc granulator for granulation to obtain green billets; the green billets are sent to a rotary kiln through a bucket chain elevator and a screw conveyor for calcination, and then sent to a heat exchange device for cooling to obtain clinker; the calcination temperature is 1300-1375°C, the calcination time is 2 hours, the fuel used for calcination is natural gas and ammonia generated by the recovery granulator, and the natural gas and ammonia are sent to the fuel inlet of the rotary kiln through a fuel delivery pipeline by a blower; the dust generated by the heat exchange device is recovered by a bag dust collector; the tail gas from the rotary kiln is treated in the tail gas treatment system; Step 3: The clinker obtained in step 2 is sent to a packaging machine through a belt conveyor for packaging to obtain a petroleum proppant.

[0015] By adopting the above-mentioned design scheme, the beneficial effects of the present invention are: through the raw material processing system, the raw powder calcination system and the clinker processing system, the useful components in the aluminum ash are used to prepare refined slag, the process is simple, the generation of hazardous waste is reduced, and the resource utilization, harmlessness and efficiency of aluminum ash are realized; in addition, the device also includes an exhaust gas treatment system and a dust removal device, so that the dust and harmful gases generated in the production process are treated, reducing environmental pollution. In addition, the dust generated by the equipment can also be concentrated in a fixed space and not dispersed, and the dust is centrally treated by a bag dust collector; the exhaust gas treatment system integrates the sedimentation chamber and the spray chamber into one device, and realizes sedimentation dust removal and spray absorption at the same time, which can reduce the equipment footprint; after sedimentation and spraying, the exhaust gas can achieve standard emission.

[0016] The raw materials and auxiliary materials used are mostly solid waste, with a wide range of sources and low production costs. The use of reduction roasting and magnetic separation iron removal technology solves the problem of comprehensive utilization of aluminum ash slag and various auxiliary solid waste resources, which is environmentally friendly and has good economic and social benefits. The whole process does not produce wastewater and waste, and is green. Through experimental research, auxiliary materials with superior performance are selected, which greatly increases the various properties of the proppant, so that it can be transported to various environments of actual production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the process principle diagram of the present invention; Figure 2 It is a structural schematic diagram of the present invention; Figure 3 A top view of the present invention; Figure 4 It is a partial schematic diagram of the present invention. DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Reference Figures 1 to 4 An aluminum ash resource comprehensive utilization system, including a raw material processing system, a raw powder calcination system and an exhaust gas treatment system 9; The raw material processing system includes a feeding device 1, a magnetic separation unit 2 for magnetically separating and screening the aluminum ash slag in the feeding device 1, a ball mill 3 for grinding the aluminum ash slag, a rolling screen 4 for screening aluminum particles of different sizes in the ground aluminum ash slag, and a conveying device 9 for transporting the aluminum ash slag in various devices. The discharge port of the feeding device 1 is connected to the feed port of the ball mill 3, and the discharge port of the ball mill 3 is connected to the feed port of the rolling screen 4. The bottom of the feeding device 1 is provided with a recovery device (at the position in the figure) for recovering the metal aluminum screened by the magnetic separation unit 2; The raw powder calcining system includes a double-kiln rotary kiln 5, an additive silo 6, a granulator 7 and a heat exchanger 8. The double-kiln rotary kiln 5 includes a preheating section 51, a transition section 52 and a calcining section 53. The discharge port of the rolling screen 4 is connected to the feed port of the additive silo 6 through a conveying device 9, and is transported to the granulator 7 for stirring and extrusion. The discharge port of the granulator 7 is connected to the feed port of the preheating section 51. The heat exchanger 8 is connected to the transition section 52 and transports the heat of the preheating section 51 to the calcining section 53. The tail gas outlet of the double-kiln rotary kiln 5 is connected to the tail gas treatment system 9 .

[0020] Furthermore, the preheating section 51 and the calcining section 53 are both cylindrical tubes with openings at both ends. A feed port is provided at the end of the preheating section 51, and the feed port is arranged at the end of the preheating section 51 away from the transition section 52. A discharge port is provided at the end of the calcining section 53, and the discharge port is arranged at the end of the calcining section 53 away from the transition section 52. The transition section 52 is an interior, and the transition section 52 is a cylindrical furnace shaft with a hollow cavity, and a cylindrical furnace shaft with a guide plate is arranged inside. A first interface and a second interface are respectively arranged on the side walls of the furnace shaft, and the first interface is arranged above the second interface. The preheating section 51 is connected with the inner cavity of the furnace shaft through the first interface, and the calcining section 53 is connected with the inner cavity of the furnace shaft through the second interface.

[0021] Furthermore, the feeding device 1, the rolling screen 4 and the ball mill 3 are all placed in a closed space, and a feeding port, a discharging port and a dust suction port are provided in the closed space, and the dust suction port is connected to the bag dust collector through a pipeline.

[0022] Furthermore, the exhaust gas treatment system 9 includes a sedimentation spray tower, an alkali solution pool, an alkali solution circulation pump and a chimney. The sedimentation spray tower is divided into a lower sedimentation chamber and an upper spray chamber by a partition arranged in the middle. A plurality of baffles are arranged in a staggered manner in the sedimentation chamber. A first exhaust gas inlet is arranged on the lower side of the sedimentation chamber, a first exhaust gas outlet is arranged on the upper part, and a dust outlet is arranged on the lower bottom surface. A multi-layer nozzle is arranged in the upper part of the spray chamber, and alkali solution is stored in the lower part of the spray chamber. A second exhaust gas inlet is arranged on one side in the middle of the spray chamber, an alkali solution overflow port is arranged on the other side in the middle, and a second exhaust gas outlet is arranged on the top. The first exhaust gas outlet is connected to the second exhaust gas inlet through a pipeline, the alkali solution overflow port is connected to the alkali solution inlet at the top of the alkali solution pool through a pipeline, the alkali solution circulation pump is connected to the nozzle through a pipeline, and the second exhaust gas outlet is connected to the flue gas inlet at the bottom of the chimney through a pipeline.

[0023] Furthermore, ammonia generated after metered stirring and sufficient stirring is transported to the calcination section 53 through a pipeline to assist combustion in the calcination section 53 and increase the temperature in the calcination section 53. The discharge port of the calcination section 53 is provided with a device for recovering fine aluminum ash 12-60 mesh granular aggregate calcined in the calcination section 53. The fine aluminum ash 12-60 mesh granular aggregate is further processed by an aggregate cooling system to achieve vitrified 12-60 mesh granular aggregate, i.e., petroleum proppant; harmful gases after calcination in the calcination section 53 are further processed by an exhaust gas treatment system.

[0024] Furthermore, the additive silo 6 adds a composition of calcium oxide, aluminum oxide and silicon dioxide and stirs and mixes it with the aluminum ash sifted out by the rolling screen 4 .

[0025] Furthermore, it also includes a drying system, which is connected to the additive silo 6 , and the additive silo 6 is added with sludge and slag dried by the drying system, and the drying system is connected to the heat exchange device 8 .

[0026] A system process for comprehensive utilization of aluminum ash slag resources, comprising the following steps: Step 1: Add aluminum ash slag into ball mill 3 and grind it to a particle size of less than 150 meshes, i.e. raw powder, which falls into rolling screen 4 to screen out metal aluminum particles; then add the finely crushed aluminum ash slag, calcium oxide, silicon dioxide, aluminum oxide, and iron oxide into ball mill 3 according to a certain proportion; the dust generated by ball mill 3 and rolling screen 4 is recovered by bag dust collector; Step 2: The raw powder obtained in step 1 is then put into a disc granulator 7 for granulation to obtain a green body; the green body is sent to a rotary kiln through a bucket chain elevator and a screw conveyor for calcination, and then sent to a heat exchange device 8 for cooling to obtain a clinker; the calcination temperature is 1300-1375°C, the calcination time is 2 hours, the fuel used for calcination is natural gas and ammonia generated by the recovery granulator 7, and the natural gas and ammonia are sent to the fuel inlet of the rotary kiln through a fuel delivery pipeline by a blower; the dust generated by the heat exchange device 8 is recovered by a bag dust collector; the tail gas from the rotary kiln enters the tail gas treatment system 9 for treatment; Step 3: The clinker obtained in step 2 is sent to a packaging machine through a belt conveyor for packaging to obtain a petroleum proppant.

[0027] By adopting the above-mentioned design scheme, the beneficial effects of the present invention are: through the raw material processing system, the raw powder calcination system and the clinker processing system, the useful components in the aluminum ash are used to prepare refined slag, the process is simple, the generation of hazardous waste is reduced, and the resource utilization, harmlessness and efficiency of aluminum ash are realized; in addition, the device also includes an exhaust gas treatment system 9 and a dust removal device, so that the dust and harmful gases generated in the production process are treated, reducing environmental pollution. In addition, the dust generated by the equipment can also be concentrated in a fixed space and not dispersed, and the dust is centrally treated by a bag dust collector; the exhaust gas treatment system 9 integrates the sedimentation chamber and the spray chamber into one device, and realizes sedimentation dust removal and spray absorption at the same time, which can reduce the equipment footprint; after sedimentation and spraying, the exhaust gas can achieve standard emission.

[0028] The raw materials and auxiliary materials used are mostly solid waste, with a wide range of sources and low production costs. The use of reduction roasting and magnetic separation iron removal technology solves the problem of comprehensive utilization of aluminum ash slag and various auxiliary solid waste resources, which is environmentally friendly and has good economic and social benefits. The whole process does not produce wastewater and waste, and is green. Through experimental research, auxiliary materials with superior performance are selected, which greatly increases the various properties of the proppant, so that it can be transported to various environments of actual production.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A system for comprehensive utilization of aluminum ash resources, characterized by: Including raw material processing system, raw powder calcination system and tail gas treatment system, The raw material processing system includes a feeding device, a magnetic separation unit for magnetically separating and screening the aluminum ash slag in the feeding device, a ball mill for grinding the aluminum ash slag, a rolling screen for screening aluminum particles of different sizes in the ground aluminum ash slag, and a conveying device for transporting the aluminum ash slag in various devices, the discharge port of the feeding device is connected to the feed port of the ball mill, the discharge port of the ball mill is connected to the feed port of the rolling screen, and a recovery device for recovering the metal aluminum screened by the magnetic separation unit is provided at the bottom of the feeding device; The raw powder calcining system comprises a double-kiln rotary kiln, an additive silo, a granulator and a heat exchange device. The double-kiln rotary kiln comprises a preheating section, a transition section and a calcining section. The discharge port of the rolling screen is connected to the feed port of the additive silo through the conveying device and is conveyed to the granulator for stirring and extrusion. The discharge port of the granulator is connected to the feed port of the preheating section. The heat exchange device is connected to the transition section and conveys the heat of the preheating section to the calcining section. The tail gas outlet of the double-kiln rotary kiln is connected to the tail gas treatment system.

2. The aluminum ash slag resource comprehensive utilization system according to claim 1 is characterized in that: The preheating section and the calcining section are both cylindrical tubes with openings at both ends. A feed port is provided at the end of the preheating section, and the feed port is arranged at the end of the preheating section away from the transition section. A discharge port is provided at the end of the calcining section, and the discharge port is arranged at the end of the calcining section away from the transition section. The transition section is a cylindrical furnace shaft with a guide plate arranged inside. A first interface and a second interface are respectively arranged on the side walls of the furnace shaft, and the first interface is arranged above the second interface. The preheating section is connected to the inner cavity of the furnace shaft through the first interface, and the calcining section is connected to the inner cavity of the furnace shaft through the second interface.

3. The aluminum ash slag resource comprehensive utilization system according to claim 2 is characterized by: The feeding device, the rolling screen and the ball mill are all placed in a closed space. The closed space is provided with a feeding port, a discharging port and a dust suction port. The dust suction port is connected to a bag dust collector through a pipeline.

4. The aluminum ash slag resource comprehensive utilization system according to claim 2 is characterized by: The exhaust gas treatment system includes a sedimentation spray tower, an alkali solution pool, an alkali solution circulation pump and a chimney. The sedimentation spray tower is divided into a lower sedimentation chamber and an upper spray chamber by a partition arranged in the middle. A plurality of baffles are arranged in a staggered manner in the sedimentation chamber. A first exhaust gas inlet is arranged on the lower side of the sedimentation chamber, a first exhaust gas outlet is arranged on the upper part, and a dust outlet is arranged on the lower bottom surface. A multi-layer nozzle is arranged on the upper part of the spray chamber, and alkali solution is stored in the lower part of the spray chamber. A second exhaust gas inlet is arranged on one side of the middle part of the spray chamber, an alkali solution overflow port is arranged on the other side of the middle part, and a second exhaust gas outlet is arranged on the top. The first exhaust gas outlet is connected to the second exhaust gas inlet through a pipeline, and the alkali solution overflow port is connected to the alkali solution inlet on the upper part of the alkali solution pool through a pipeline. The alkali solution circulation pump is connected to the nozzle through a pipeline, and the second exhaust gas outlet is connected to the smoke inlet at the lower part of the chimney through a pipeline.

5. The aluminum ash slag resource comprehensive utilization system according to claim 2 is characterized by: The discharge port of the calcining section is provided with a device for recovering the fine aluminum ash 12-60 mesh granular aggregate after calcining the fine aluminum ash in the calcining section, and treating it through an aggregate cooling system to achieve vitrified 12-60 mesh granular aggregate, i.e., petroleum proppant. The harmful gas after calcination in the calcining section is treated through an exhaust gas treatment system.

6. The aluminum ash slag resource comprehensive utilization system according to claim 2 is characterized by: The additive silo adds calcium oxide, aluminum oxide, and silicon dioxide composition and stirs and mixes it with the aluminum ash sifted out by the rolling screen.

7. The aluminum ash slag resource comprehensive utilization system according to claim 6 is characterized by: It also includes a drying system, which is connected to the additive silo. The additive silo is added with sludge and slag dried by the drying system. The drying system is connected to the heat exchange device.

8. A method for comprehensive utilization of aluminum ash slag resources, characterized in that: The following steps are involved: Step 1: Add aluminum ash slag into a ball mill and grind it to a particle size of less than 150 meshes, that is, raw powder, which falls into a rolling screen to screen out metal aluminum particles; then add the finely crushed aluminum ash slag, calcium oxide, silicon dioxide, aluminum oxide, and iron oxide into the ball mill according to a certain proportion; the dust generated by the ball mill and the rolling screen is recovered by a bag dust collector; Step 2: The raw powder obtained in step 1 is put into a disc granulator for granulation to obtain green billets; the green billets are sent to a rotary kiln through a bucket chain elevator and a screw conveyor for calcination, and then sent to a heat exchange device for cooling to obtain clinker; the calcination temperature is 1300-1375°C, the calcination time is 2 hours, the fuel used for calcination is natural gas and ammonia generated by the recovery granulator, and the natural gas and ammonia are sent to the fuel inlet of the rotary kiln through a fuel delivery pipeline by a blower; the dust generated by the heat exchange device is recovered by a bag dust collector; the tail gas from the rotary kiln is treated in the tail gas treatment system; Step 3: The clinker obtained in step 2 is sent to a packaging machine through a belt conveyor for packaging to obtain a petroleum proppant.

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