Device for preparing limestone slurry and calcium hydroxide for laterite-nickel ore hydrometallurgy

Abstract

The present invention relates to the technical field of powder. Disclosed is a device for preparing limestone slurry and calcium hydroxide for laterite-nickel ore hydrometallurgy, comprising a limestone slurry preparation component and a calcium hydroxide preparation component. The limestone slurry preparation component comprises a first feeder, a pulverizer, a mixer, a first conveying pump and a first buffer tank which are sequentially connected, and when the weight of limestone slurry in the first buffer tank is not within a preset range, the first feeder, the pulverizer, the mixer and the first conveying pump can adjust respective working speeds. The calcium hydroxide preparation component comprises a lime kiln, a second feeder, a nitration machine, a third conveying pump and a second buffer tank which are sequentially connected, and when the weight of calcium hydroxide of the second buffer tank is not within a preset range, the lime kiln, the second feeder, the nitration machine and the third conveying pump can adjust respective working speeds. The whole production line can achieve linkage response, the production efficiency is integrally and automatically adjusted, and the intelligent degree is high.

Description

Limestone slurry and lime milk preparation device for laterite nickel ore hydrometallurgy Technical Field

[0001] The present invention relates to the field of powder technology, in particular to a device for preparing limestone slurry and lime milk for wet smelting of laterite nickel ore. Background Art

[0002] Currently, in the hydrometallurgical process of laterite nickel ore, nickel and cobalt precipitation typically involves acid leaching the laterite nickel ore, followed by the use of limestone or lime milk as a neutralizer to precipitate the nickel and cobalt in the acid leaching solution, forming a nickel-cobalt precipitate. In the prior art, various devices are used to prepare limestone or lime milk.

[0003] For example, the prior art with announcement number CN102674714A provides a lime milk preparation device, which includes a feeding unit, a nitrification unit, a dissolution unit, a dust suction unit, a dust removal unit and a recovery unit, and completes the preparation of lime milk through the coordinated cooperation between the various units.

[0004] However, the prior art still has some deficiencies. For example, the preparation device does not involve any automatic control structure and cannot automatically control the preparation of lime milk. The preparation device is not intelligent enough during the working process.

[0005] Summary of the Invention

[0006] In view of this, it is necessary to provide a limestone slurry and lime milk preparation device for wet smelting of laterite nickel ore to solve the technical problems that the lime milk preparation device in the prior art has no automatic control structure, cannot automatically control the preparation of lime milk, and is not intelligent enough during the working process.

[0007] In order to achieve the above technical objectives, the technical solution of the present invention provides a device for preparing limestone slurry and lime milk for hydrometallurgy of laterite nickel ore, comprising:

[0008] A limestone slurry preparation component comprises a first feeder, a grinding mill, a mixer, a first delivery pump and a first buffer tank connected in sequence, wherein the first feeder has a first controller, the grinding mill has a second controller, the mixer has a third controller, the first delivery pump has a fourth controller, and the first buffer tank has a fifth controller, the fifth controller being connected to the first, second, third and fourth controllers simultaneously, the fifth controller being capable of sending a first sensing signal when the weight of the limestone slurry in the first buffer tank is not within a preset range and transmitting the signal to the first, second, third and fourth controllers, the first controller being capable of controlling the speed at which the first feeder supplies the limestone raw material according to the first sensing signal, the second controller being capable of controlling the grinding speed of the grinding mill according to the first sensing signal, the third controller being capable of controlling the mixing speed of the mixer according to the first sensing signal, and the fourth controller being capable of controlling the speed at which the first delivery pump delivers the limestone slurry according to the first sensing signal;

[0009] A lime milk preparation component includes a lime kiln, a second feeder, a nitrifier, a third delivery pump, and a second buffer tank connected in sequence. The lime kiln is used to prepare quicklime and deliver the quicklime to the second feeder. The second feeder has a sixth controller, the nitrifier has a seventh controller, the third delivery pump has an eighth controller, and the second buffer tank has a ninth controller. The ninth controller is simultaneously connected to the sixth controller, the seventh controller, and the eighth controller. The ninth controller can emit a second sensing signal when the weight of the lime milk in the second buffer tank is not within a preset range and transmit the signal to the sixth controller, the seventh controller, and the eighth controller. The sixth controller can control the speed at which the second feeder supplies quicklime raw materials based on the second sensing signal. The seventh controller can control the speed at which the nitrifier mixes quicklime and water based on the second sensing signal. The eighth controller can control the speed at which the third delivery pump delivers the lime milk based on the second sensing signal.

[0010] Furthermore, the first feeder includes a first body and a first hopper that are slidably connected, and the first hopper is used to slide up and down relative to the first body to transport the limestone raw material into the grinding mill; the first hopper is connected to the first controller, and the first controller can control the speed at which the first hopper slides up and down relative to the first body according to the first sensing signal, thereby adjusting the speed at which the first feeder supplies the limestone raw material to the grinding mill.

[0011] Furthermore, the grinding mill includes a grinding motor, a grinding disc, a grinding roller, a hydraulic pressing device, a wind conveying channel and a powder classifier. The number of the grinding rollers is 2-4, and the multiple grinding rollers are evenly arranged around the center of the grinding disc. The hydraulic pressing device is connected to the multiple grinding rollers and is used to drive the multiple grinding rollers to press the limestone raw material between the grinding disc and the grinding rollers. The grinding motor is connected to the grinding disc and can drive the grinding disc to rotate relative to the grinding roller to grind the limestone raw material into limestone powder; the powder classifier and the limestone raw material are respectively located at the air inlet and air outlet of the wind conveying channel. The wind conveying channel is used to blow out the limestone powder, and the powder classifier is used to allow limestone powder of a preset particle size to pass through.

[0012] Furthermore, the mixer includes a third body and a stirring motor and a stirring rod provided on the third body. The stirring motor is connected to the stirring rod and can drive the stirring rod to rotate to mix limestone powder and water; the stirring motor is connected to the third controller, and the third controller can control the stirring motor to drive the rotational speed of the stirring rod according to the first sensing signal, thereby adjusting the mixing speed of the mixer.

[0013] Furthermore, the limestone slurry preparation component also includes a first transmission belt and a first elevator. The first feeder, the first transmission belt, the first elevator and the grinding mill are connected in sequence. The first transmission belt is used to transfer the limestone supplied by the first feeder to the first elevator. The first elevator is used to transfer the limestone to the grinding mill so that the grinding mill grinds the limestone into powder.

[0014] Furthermore, the second feeder includes a fourth body and a second hopper that are slidably connected, and the second hopper is used to slide up and down relative to the fourth body to transport the quicklime raw material into the nitrifying machine; the second hopper is connected to the sixth controller, and the sixth controller can control the speed at which the second hopper slides up and down relative to the fourth body according to the second sensing signal, thereby adjusting the speed at which the second feeder supplies the quicklime raw material to the nitrifying machine.

[0015] Furthermore, the nitrification machine includes a fifth body and a digestion motor and a digestion rod provided on the fifth body. The digestion motor is connected to the digestion rod and can drive the digestion rod to rotate to stir and mix quicklime and water; the digestion motor is connected to the seventh controller, and the seventh controller can control the speed of the digestion motor to drive the digestion rod according to the second sensing signal, thereby adjusting the speed of the nitrification machine mixing quicklime and water.

[0016] Furthermore, the limestone slurry preparation component also includes a limestone powder storage tank and a rotor scale. The limestone powder storage tank is arranged between the second elevator and the rotor scale. The limestone powder storage tank is used to receive the limestone powder transported by the second elevator, and the rotor scale is used to weigh the limestone powder storage tank.

[0017] Furthermore, the lime milk preparation assembly further includes a slag extractor, which is provided between the nitrifier and the third delivery pump, and is used to extract impurities from the nitrifier.

[0018] Furthermore, the slag extractor has a tenth controller, which is connected to the ninth controller. The tenth controller can control the speed of the slag extractor to extract impurities according to the second sensing signal.

[0019] Furthermore, the slag stripping machine includes a connected slag stripping motor and a propeller, a portion of the propeller is located in the solution contained in the nitrification machine, and the propeller can rotate under the drive of the slag stripping motor to discharge impurities in the solution; the slag stripping motor is connected to the tenth controller, and the tenth controller can control the rotational speed of the propeller driven by the slag stripping motor according to the second sensing signal, thereby adjusting the speed at which the propeller discharges impurities.

[0020] Compared with the prior art, the beneficial effects of the present invention include: the limestone slurry preparation component of the present invention can be used to prepare limestone slurry, and the lime milk preparation component can be used to prepare lime milk. During the process of preparing limestone slurry by the limestone slurry preparation component, if the amount of limestone slurry collected in the first buffer tank does not reach a preset value, the fourth controller generates a first sensing signal and transmits it to the first controller, the second controller, and the third controller at the same time, so that the first feeder automatically adjusts the speed of supplying limestone raw materials, the grinding mill automatically adjusts its grinding speed, and the mixer automatically adjusts its mixing speed until the amount of limestone slurry collected in the first buffer tank reaches a preset value. The entire production line can respond in a linked manner, and the overall automatic adjustment of production efficiency is high, with a high degree of intelligence.

[0021] During the lime milk preparation process, if the amount of lime milk collected in the second buffer tank does not reach a preset value, the ninth controller generates a second sensing signal and transmits it simultaneously to the sixth, seventh, and eighth controllers. This automatically adjusts the speed at which the second feeder supplies quicklime, the nitrifier adjusts the speed at which the quicklime and water are mixed, and the third delivery pump adjusts the speed at which the lime milk is delivered, until the amount of limestone slurry collected in the second buffer tank reaches the preset value. This interconnected response of the entire production line ensures automated production efficiency and a high degree of intelligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic structural diagram of a limestone slurry preparation assembly according to the present invention;

[0023] FIG2 is a schematic diagram of the process of preparing the limestone slurry assembly of the present invention;

[0024] FIG3 is a schematic structural diagram of a grinding mill according to the present invention;

[0025] FIG4 is a top view of the powder separator of the present invention;

[0026] FIG5 is a schematic structural diagram of a lime milk preparation assembly according to the present invention;

[0027] FIG6 is a schematic diagram of the operation flow of the lime milk preparation assembly of the present invention.

[0028] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0029] 1. Limestone discharge silo; 2. First feeder; 3. First transmission belt; 4. First elevator; 5. Grinding mill; 6. Second elevator; 7. Limestone powder storage tank; 8. Rotor scale; 9. Mixer; 10. First delivery pump; 11. Limestone slurry storage tank; 12. Second delivery pump; 13. First buffer tank; 14. Lime kiln; 15. Second transmission belt; 16. Third elevator; 17. Lime silo; 18. Second feeder; 19. Nitrifier; 20. Slag extractor; 21. Third delivery pump; 22. Storage tank; 23. Lime milk delivery pump; 24. Second buffer tank; 51. Grinding mill motor; 511. Bracket; 512. Impeller; 513. Blades; 52. Grinding disc; 53. Grinding roller; 54. Hydraulic clamping device; 541. Pressing plate; 55. Pneumatic conveying channel; 56. Powder separator. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0031] The present invention provides a device for preparing limestone slurry and lime milk for laterite nickel ore hydrometallurgy. The device comprises a limestone slurry preparation component and a lime milk preparation component. The limestone slurry preparation component can be used to prepare limestone slurry, and the lime milk preparation component can be used to prepare lime milk. Both the limestone slurry preparation component and the lime milk preparation component can achieve automatic control of the entire production line during the limestone slurry preparation process, and the lime milk preparation component can achieve automatic control of the entire production line during the limestone slurry preparation process. The entire production line can respond in a coordinated manner, automatically adjust production efficiency, and have a high degree of intelligence.

[0032] 1 , the limestone slurry preparation assembly includes a limestone lower hopper 1, a first feeder 2, a first conveyor belt 3, a first elevator 4, a grinding mill 5, a second elevator 6, a rotor scale 8, a mixer 9, a first delivery pump 10, a limestone slurry storage tank 11, a second delivery pump 12 and a first buffer tank 13 connected in sequence, and the first feeder 2 has a first controller.

[0033] The limestone feed bin 1 has a certain storage space for storing a certain amount of limestone raw materials. The limestone raw materials are in block shape and easy to transport. The limestone feed bin 1 also has a transporting manipulator for transporting the limestone raw materials to the first feeder 2.

[0034] The first feeder 2 has a certain storage space that can be used to store a certain amount of limestone raw materials. The first feeder 2 includes a first main control board, a first body, a first material tray, a first weighing instrument and a first hopper, wherein the first material tray is arranged on the first weighing instrument, and the first body has a storage space for storing limestone raw materials. The first hopper is slidably arranged on the first body, and the first hopper is used to slide up and down relative to the first body to grab the limestone raw materials in the first body to the first material tray. The first main control board is wirelessly connected to the first weighing instrument, and the first main control board is connected to the first hopper. When the weight measured by the first weighing instrument exceeds the preset value, the first main control board controls the first hopper to grab the first material tray and pour the limestone raw materials on the first material tray onto the first transmission belt 3.

[0035] By weighing with the first weighing instrument, the weight of the quicklime placed on the first conveyor belt 3 by the first feeder 2 per unit time is substantially the same.

[0036] The first transmission belt 3 is driven by a motor connected thereto, and both ends of the first transmission belt 3 are respectively arranged close to the first feeder 2 and the first elevator 4. The first transmission belt 3 can drive the limestone raw material to the position of the first elevator 4.

[0037] The first elevator 4 is used to pick up the limestone material conveyed by the first conveyor belt 3 and transfer it to the grinding mill 5. Specifically, the first elevator 4 comprises a main body and a loading tray slidably mounted on the main body. The loading tray is initially connected to the end of the first conveyor belt 3, allowing the limestone material on the first conveyor belt 3 to drop directly onto the loading tray. The loading tray automatically measures the weight of the loaded limestone material and has a second main control board. When the loading tray weight exceeds a preset value, the second main control board automatically controls the loading tray to slide relative to the main body, thereby dumping the limestone material in the loading tray into the grinding mill 5.

[0038] Referring to Figure 3 , the grinding mill 5 includes a grinding motor 51, a grinding disc 52, grinding rollers 53, a hydraulic clamping device 54, a pneumatic conveying channel 55, and a powder selector 56. The grinding rollers 53 may be multiple, for example, 2-4, or more than four. The multiple grinding rollers 53 are evenly arranged around the center of the grinding disc 52 so that they can contact as much limestone raw material as possible, thereby improving grinding efficiency.

[0039] The hydraulic clamping device 54 can be understood as a lever structure, comprising a pressure plate 541, which is simultaneously connected to the multiple grinding rollers 53. Driven by the hydraulic clamping device 54, the pressure plate 541 can simultaneously apply force to the multiple grinding rollers 53, causing the multiple grinding rollers 53 to compress the limestone material between the grinding disc 52 and the grinding rollers 53. The grinding motor 51 is connected to the grinding disc 52 and can drive the grinding disc 52 to rotate relative to the grinding rollers 53, thereby grinding the limestone material into limestone powder.

[0040] The powder classifier 56 and the limestone raw material are respectively located at the air inlet and air outlet of the wind conveying channel 55. The air inlet of the wind conveying channel 55 is provided with a blower, which is used to blow air into the wind conveying channel 55 to blow the polished limestone powder to the air outlet of the wind conveying channel 55.

[0041] Referring to Figure 4, the powder classifier 56 includes a bracket 511, an impeller 512, and a powder classifier motor. The bracket 511 and impeller 512 are rotatably connected. The powder classifier motor is connected to the impeller 512 and can drive the impeller 512 to rotate relative to the bracket 511. The rotation plane of the impeller 512 is perpendicular to the airflow direction of the wind conveying channel 55. The limestone powder reaches the impeller 512 under the action of the wind. The impeller 512 has multiple blades 513 spaced circumferentially, with gaps between adjacent blades 513. As the impeller 512 rotates, limestone powder of a predetermined particle size can pass through it, allowing the limestone powder of the predetermined particle size to pass through the impeller 512 and enter subsequent processing steps. Limestone powder with larger particle sizes that do not meet the predetermined particle size is knocked off by the impeller 513 and falls onto the grinding wheel 52 for further grinding until the limestone powder of the predetermined particle size passes through the impeller 512.

[0042] A chute fan can be installed between the grinding mill 5 and the second elevator 6. The chute fan is used to blow away the falling limestone powder, and then drop it onto the second elevator 6, so that the limestone powder accumulated on the second elevator 6 is in a fluffy state, thereby avoiding the accumulation of limestone powder and affecting subsequent processing.

[0043] The structure of the second elevator 6 is consistent with that of the first elevator 4 described above. The second elevator 6 is used to transfer the limestone powder to the rotor scale 8 .

[0044] A Roots blower can also be provided near the rotor scale 8 , and the Roots blower can blow away excess limestone powder near the rotor scale 8 to avoid affecting the weighing of the rotor scale 8 .

[0045] The rotor scale 8 is used to weigh the transferred limestone powder. When the weight reaches a preset value, the limestone powder on the rotor scale 8 can be manually poured into the mixer 9.

[0046] Mixer 9 includes a third body and a stirring motor and stirring rod mounted therein. The stirring motor is connected to the stirring rod and is capable of driving the stirring rod to rotate and mix the limestone powder and water to form a preliminary limestone slurry. The third body includes a mixing tank for holding the limestone powder and water. The mixing tank is connected to a water pipe that supplies a fixed amount of water to the mixing tank for mixing with the limestone powder in the mixing tank.

[0047] The first delivery pump 10 is connected to the mixing tank. When the limestone powder and water in the mixing tank are fully mixed to form limestone slurry, the first delivery pump 10 starts to work and pumps the limestone slurry into the limestone slurry storage tank 11 for temporary storage.

[0048] The other side of the limestone slurry storage tank 11 is connected to the second delivery pump 12, which can pump the limestone slurry to the first buffer tank 13 for storage again to obtain limestone slurry directly used for laterite nickel ore hydrometallurgy.

[0049] The above-mentioned first feeder 2 has a first controller, the grinding mill 5 has a second controller, the mixer 9 has a third controller, the first conveying pump 10 has a fourth controller, and the first buffer tank 13 has a fifth controller. The fifth controller is connected to the first controller, the second controller, the third controller and the fourth controller at the same time. The fifth controller can send a first sensing signal when the weight of the limestone slurry in the first buffer tank 13 is not within a preset range and transmit it to the first controller, the second controller, the third controller and the fourth controller. The first controller can control the speed at which the first feeder 2 supplies the limestone raw material according to the first sensing signal, the second controller can control the grinding speed of the grinding mill 5 according to the first sensing signal, the third controller can control the mixing speed of the mixer 9 according to the first sensing signal, and the fourth controller can control the speed at which the first conveying pump 10 conveys the limestone slurry according to the first sensing signal.

[0050] When the weight of the limestone slurry in the first buffer tank 13 is less than a preset range, the fifth controller automatically controls the first, second, third, and fourth controllers, causing each controller to control its respective working components to increase their operating speeds, thereby increasing production capacity. Conversely, when the weight of the limestone slurry in the first buffer tank 13 is greater than the preset range, the fifth controller controls its respective working components to decrease their operating speeds, thereby reducing production capacity. Ultimately, this balances production capacity and promotes stable production.

[0051] The first sensing signal includes a first signal and a second signal. When the weight of the limestone slurry in the first buffer tank 13 is less than a preset range, the fifth controller generates a first signal and transmits it to the first controller, the second controller, the third controller and the fourth controller, so that each controller controls its own working component to speed up the operation speed, thereby improving production capacity.

[0052] When the weight of the limestone slurry in the first buffer tank 13 is greater than a preset range, the fifth controller generates a second signal and transmits it to the first controller, the second controller, the third controller and the fourth controller, so that each controller controls its own working component to reduce the operating speed, thereby reducing production capacity.

[0053] The first controller can control the speed of the first feeder 2 supplying the limestone raw material according to the first sensing signal, which can be understood as follows:

[0054] The first hopper is connected to the first controller, which can control the speed at which the first hopper slides up and down relative to the first body according to the first sensing signal, thereby adjusting the speed at which the first feeder 2 supplies the limestone raw material to the grinding mill 5.

[0055] The second controller can control the grinding speed of the grinding mill 5 according to the first sensing signal, which can be understood as follows:

[0056] The grinding motor is connected to a second controller, which is capable of controlling the speed at which the grinding motor drives the crushing briquette to move up and down based on the first sensing signal, thereby adjusting the speed at which the limestone material is crushed. The faster the grinding motor drives the crushing briquette to move up and down, the faster the limestone material is crushed, and vice versa.

[0057] The third controller can control the mixing speed of the mixer 9 according to the first sensing signal, which can be understood as follows:

[0058] The stirring motor of the mixer 9 is connected to a third controller, which can control the rotational speed of the stirring rod driven by the stirring motor according to the first sensing signal, thereby adjusting the mixing speed of the mixer 9. The faster the rotational speed of the stirring rod driven by the stirring motor is, the faster the mixing speed of the mixer 9 is, and vice versa.

[0059] The fourth controller can control the speed of the first delivery pump 10 to deliver the limestone slurry according to the first sensing signal, which can be understood as follows:

[0060] The first delivery pump 10 is connected to the mixing tank of the mixer 9 through a water pipe. The mixing tank contains limestone slurry. The first delivery pump 10 can automatically control the speed of pumping the limestone slurry according to the first sensing signal.

[0061] 3 , the lime milk preparation assembly includes a lime kiln 14, a second conveyor belt 15, a third elevator 16, a lime silo 17, a second feeder 18, a nitrifier 19, a slag extractor 20, a third conveying pump 21 and a second buffer tank 24 connected in sequence. The lime kiln 14 is used to burn and prepare quicklime and convey the quicklime to the second conveyor belt 15. The second conveyor belt 15 conveys the quicklime to the third elevator 16. The third elevator 16 then transfers the quicklime to the second feeder 18. The second feeder 18 supplies quicklime to the nitrifier 19 in a quantitative manner, and mixes it with water to react to form preliminary lime milk. After the preliminary lime milk passes through the slag extractor 20 to remove excess impurities, the lime milk is conveyed to the second buffer tank 24 for storage through the third conveying pump 21.

[0062] The lime kiln 14 comprises a firing chamber and an extraction chamber, wherein the firing chamber is used to fire limestone and burn the limestone into quicklime. The extraction chamber has a manipulator, which is used to transfer the fired quicklime to the second conveyor belt 15.

[0063] The second conveyor belt 15 is used to convey the quicklime to a location close to the third elevator 16 .

[0064] The structure of the third elevator 16 is identical to that of the first elevator 4 and will not be further described here. The third elevator 16 is used to transfer quicklime to a lime silo 17 for temporary storage. The lime silo 17 also includes a manipulator that picks up quicklime from the silo for transfer to the second feeder 18.

[0065] The second feeder 18 includes a fourth body and a second hopper that are slidably connected. The second hopper is used to slide up and down relative to the fourth body to transport quicklime to the nitrifying machine 19.

[0066] The second feeder 18 includes a second main control board, a fourth body, a second feed tray, a second scale, and a second hopper. The second feed tray is mounted on the second scale, and the second hopper is connected to the second main control board. The fourth body has a storage space for quicklime. A second hopper is slidably mounted on the fourth body and is configured to slide up and down relative to the fourth body to transfer quicklime from the fourth body to the second feed tray. The second main control board is wirelessly connected to the second scale. When the weight measured by the second scale exceeds a preset value, the second main control board controls the second hopper to grab the second feed tray and pour the quicklime from the second feed tray into the nitrifier 19.

[0067] The nitrification machine 19 includes a fifth body and a digestion motor and a digestion rod provided on the fifth body. The digestion motor is connected to the digestion rod and can drive the digestion rod to rotate to stir and mix quicklime and water to form preliminary lime milk.

[0068] The slag stripping machine 20 includes a slag stripping motor and a propeller connected thereto. A portion of the propeller is located in the lime milk solution contained in the nitrifier 19. The propeller is driven by the slag stripping motor to rotate, and impurities in the lime milk solution are discharged through the propeller blades.

[0069] A slag discharge conveyor belt can also be provided near the slag lifter 20, and the impurities discharged by the propeller can directly fall onto the slag discharge conveyor belt, which transports the impurities to the garbage collection box.

[0070] The slag stripping machine 20 also has an intermediate tank, which is switched on and off by a control valve. After the impurities have been removed, the control valve can be opened to allow the lime milk to flow into the intermediate tank.

[0071] One end of the third delivery pump 21 is connected to the middle tank through a pipeline, and the other end of the third delivery pump 21 is connected to a storage tank 22 through a pipeline. The storage tank 22 has a lime milk storage tank. The third delivery pump 21 can suck the lime milk into the lime milk storage tank for temporary storage.

[0072] The storage tank is connected to the second buffer tank 24 via a lime milk delivery pump 23 . The lime milk can be pumped into the second buffer tank 24 by pumping the lime milk to obtain lime milk that can be directly used for laterite nickel ore hydrometallurgy.

[0073] The above-mentioned second feeder 18 has a sixth controller, the nitrifier 19 has a seventh controller, the third conveying pump 21 has an eighth controller, and the second buffer tank 24 has a ninth controller. The ninth controller is connected to the sixth controller, the seventh controller and the eighth controller at the same time. The ninth controller can send a second sensing signal when the weight of the lime milk in the second buffer tank 24 is not within a preset range and transmit it to the sixth controller, the seventh controller and the eighth controller at the same time. The sixth controller can control the speed at which the second feeder 18 supplies quicklime raw materials according to the second sensing signal, the seventh controller can control the speed at which the nitrifier 19 mixes quicklime and water according to the second sensing signal, and the eighth controller can control the speed at which the third conveying pump 21 conveys lime milk according to the second sensing signal.

[0074] When the weight of the lime milk in the second buffer tank 24 is less than a preset range, the ninth controller automatically controls the sixth, seventh, and eighth controllers, causing each controller to control its respective operating components to increase their operating speeds, thereby increasing production capacity. Conversely, when the weight of the lime milk in the second buffer tank 24 is greater than a preset range, the ninth controller controls its respective operating components to decrease their operating speeds, thereby reducing production capacity. Ultimately, this balances production capacity and promotes stable production.

[0075] The second sensing signal includes a third signal and a fourth signal. When the weight of the lime milk in the second buffer tank 24 is less than a preset range, the ninth controller generates a third signal and transmits it to the sixth controller, the seventh controller, and the eighth controller, so that each controller controls its own working component to speed up the operation, thereby improving production capacity.

[0076] When the weight of the lime milk in the second buffer tank 24 is greater than a preset range, the ninth controller generates a fourth signal and transmits it to the sixth, seventh and eighth controllers, so that each controller controls its own working component to reduce the operating speed, thereby reducing production capacity.

[0077] The sixth controller can control the speed of the second feeder 18 supplying the quicklime raw material according to the second sensing signal, which can be understood as follows:

[0078] The second main control board is connected to a sixth controller. The sixth controller is capable of controlling the second main control board based on the second sensing signal, so that the second main control board controls the speed at which the second hopper slides up and down relative to the fourth body, thereby adjusting the speed at which the second feeder 18 supplies the quicklime raw material to the nitrifying machine 19. The faster the second hopper slides up and down, the faster the second feeder 18 supplies the quicklime raw material to the nitrifying machine 19, and the higher the operating efficiency. Conversely, the lower the operating efficiency, the lower the operating efficiency.

[0079] The seventh controller can control the speed of the nitrification machine 19 mixing quicklime and water according to the second sensing signal, which can be understood as follows:

[0080] The digestion motor is connected to a seventh controller, which controls the rotational speed of the digestion motor to drive the digestion rod based on the second sensing signal, thereby adjusting the speed at which the nitrifier 19 mixes the quicklime and water. The faster the digestion rod rotates, the faster the nitrifier mixes the quicklime and water, and the faster the lime milk is produced. Conversely, the faster the rotational speed, the slower the speed.

[0081] The eighth controller can control the speed of the third delivery pump 21 to deliver lime milk according to the second sensing signal, which can be understood as follows: the third delivery pump 21 can automatically adjust its own operating speed according to the eighth controller. The faster the operating speed, the faster the speed of pumping lime milk, and vice versa.

[0082] The above-mentioned slag extractor 20 has a tenth controller, which is connected to the ninth controller. The tenth controller can control the speed of the slag extractor 20 extracting impurities according to the second sensing signal.

[0083] The slag extraction motor is connected to a tenth controller, and the tenth controller can control the rotation speed of the propeller driven by the slag extraction motor according to the second sensing signal, thereby adjusting the speed at which the propeller extracts impurities.

[0084] The present invention also provides a process for preparing limestone slurry and lime milk for use in wet smelting of laterite nickel ore, comprising a process for preparing limestone slurry and a process for preparing lime milk.

[0085] Referring to Figure 2, the preparation process of limestone slurry includes the following steps:

[0086] The limestone lower silo 1 conveys the limestone raw material to the first feeder 2, the first feeder 2 supplies a preset amount of limestone raw material to the first conveyor belt 3 within unit time, the first conveyor belt 3 transfers the limestone raw material to the first elevator 4, the first elevator 4 conveys the limestone raw material to the grinding mill 5, the grinding mill 5 grinds the limestone raw material into limestone powder, and conveys the limestone powder to the second elevator 6, the second elevator 6 conveys the limestone powder to the limestone powder storage tank 7, the rotor scale 8 quantitatively weighs the limestone powder storage tank 7 quantitatively grabs the limestone powder, and mixes the limestone powder with water in the mixer 9 to form a preliminary limestone slurry, the mixer 9 mixes the limestone powder and water to form limestone slurry, the first delivery pump 10 conveys the limestone slurry to the limestone slurry storage tank 11, and the second delivery pump 12 conveys the limestone slurry in the limestone slurry storage tank 11 to the first buffer tank 13 to obtain usable limestone slurry.

[0087] Referring to FIG4 , the preparation process of lime milk includes the following steps:

[0088] Limestone is placed in a lime kiln 14 and burned to form quicklime. The quicklime is placed in a second conveyor belt 15 and conveyed to a third elevator 16. The third elevator 16 transfers the quicklime to a lime silo 17. The quicklime in the lime silo 17 is transferred to a second feeder 18. The second feeder 18 supplies quicklime to a nitrifier 19 in a fixed amount per unit time. Water is added to the nitrifier 19 to react with the quicklime to form lime milk. Impurities in the lime milk are extracted using a spiral slag extractor 20. The lime milk after impurity removal is placed in an intermediate tank. The third delivery pump 21 delivers the lime milk in the intermediate tank to a lime milk storage tank. The lime milk delivery pump 23 delivers the lime milk in the lime milk storage tank to a second buffer tank 24.

[0089] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A device for preparing limestone slurry and lime milk for hydrometallurgy of laterite nickel ore, characterized in that: include: A limestone slurry preparation component, comprising a first feeder, a grinding mill, a mixer, a first delivery pump and a first buffer tank connected in sequence, wherein the first feeder has a first controller, the grinding mill has a second controller, the mixer has a third controller, the first delivery pump has a fourth controller, and the first buffer tank has a fifth controller, the fifth controller is connected to the first controller, the second controller, the third controller and the fourth controller at the same time, the fifth controller can send out a first sensing signal when the weight of the limestone slurry in the first buffer tank is not within a preset range and transmit it to the first controller, the second controller, the third controller and the fourth controller, the first controller can control the speed of the first feeder supplying limestone raw materials according to the first sensing signal, the second controller can control the grinding speed of the grinding mill according to the first sensing signal, the third controller can control the mixing speed of the mixer according to the first sensing signal, and the fourth controller can control the speed of the first delivery pump conveying limestone slurry according to the first sensing signal; A lime milk preparation component comprises a lime kiln, a second feeder, a nitrifier, a third delivery pump and a second buffer tank connected in sequence, wherein the lime kiln is used to prepare quicklime and deliver the quicklime to the second feeder, the second feeder has a sixth controller, the nitrifier has a seventh controller, the third delivery pump has an eighth controller, the second buffer tank has a ninth controller, the ninth controller is simultaneously connected to the sixth controller, the seventh controller and the eighth controller, the ninth controller can send a second sensing signal when the weight of the lime milk in the second buffer tank is not within a preset range and transmit the second sensing signal to the sixth controller, the seventh controller and the eighth controller, the sixth controller can control the speed of the second feeder supplying quicklime raw materials according to the second sensing signal, and the seventh controller can control the speed of the nitrifier mixing quicklime and water according to the second sensing signal, The eighth controller is capable of controlling the speed at which the third delivery pump delivers the lime milk according to the second sensing signal.

2. The device for preparing limestone slurry and lime milk for laterite nickel ore hydrometallurgy according to claim 1, characterized in that: The first feeder includes a first body and a first hopper which are slidably connected. The first hopper is used to slide up and down relative to the first body to transport the limestone raw material into the grinding mill. The first hopper is connected to the first controller, and the first controller can control the speed at which the first hopper slides up and down relative to the first body according to the first sensing signal, thereby adjusting the speed at which the first feeder supplies the limestone raw material to the grinding mill.

3. The device for preparing limestone slurry and lime milk for laterite nickel ore hydrometallurgy according to claim 1, characterized in that: The grinding mill includes a grinding motor, a grinding disc, a grinding roller, a hydraulic pressing device, a wind conveying channel and a powder classifier. There are 2 to 4 grinding rollers, and the plurality of grinding rollers are evenly arranged around the center of the grinding disc. The hydraulic pressing device is connected to the plurality of grinding rollers and is used to drive the plurality of grinding rollers to press the limestone raw material between the grinding disc and the grinding rollers. The grinding motor is connected to the grinding disc and can drive the grinding disc to rotate relative to the grinding roller to grind the limestone raw material into limestone powder. The powder classifier and the limestone raw material are respectively located at the air inlet and the air outlet of the wind conveying channel. The wind conveying channel is used to blow out the limestone powder, and the powder classifier is used to allow limestone powder of a preset particle size to pass through.

4. The device for preparing limestone slurry and lime milk for laterite nickel ore hydrometallurgy according to claim 1, characterized in that: The mixer includes a third body and a stirring motor and a stirring rod arranged on the third body. The stirring motor is connected to the stirring rod and can drive the stirring rod to rotate to mix limestone powder and water. The stirring motor is connected to the third controller. The third controller can control the stirring motor to drive the rotation speed of the stirring rod according to the first sensing signal, thereby adjusting the mixing speed of the mixer.

5. The device for preparing limestone slurry and lime milk for laterite nickel ore hydrometallurgy according to claim 1, characterized in that: The limestone slurry preparation component also includes a first transmission belt and a first elevator. The first feeder, the first transmission belt, the first elevator and the grinding mill are connected in sequence. The first transmission belt is used to transmit the limestone supplied by the first feeder to the first elevator. The first elevator is used to transfer the limestone to the grinding mill so that the grinding mill grinds the limestone into powder.

6. The device for preparing limestone slurry and lime milk for laterite nickel ore hydrometallurgy according to claim 1, characterized in that: The second feeder includes a fourth body and a second hopper that are slidably connected, and the second hopper is used to slide up and down relative to the fourth body to transport quicklime raw materials into the nitrifying machine; the second hopper is connected to the sixth controller, and the sixth controller can control the speed at which the second hopper slides up and down relative to the fourth body according to the second sensing signal, thereby adjusting the speed at which the second feeder supplies quicklime raw materials to the nitrifying machine.

7. The device for preparing limestone slurry and lime milk for laterite nickel ore hydrometallurgy according to claim 1, characterized in that: The nitrification machine includes a fifth body and a digestion motor and a digestion rod arranged on the fifth body. The digestion motor is connected to the digestion rod and can drive the digestion rod to rotate to stir and mix quicklime and water. The digestion motor is connected to the seventh controller. The seventh controller can control the digestion motor to drive the digestion rod to rotate according to the second sensing signal, thereby adjusting the speed of the nitrification machine mixing quicklime and water.

8. The device for preparing limestone slurry and lime milk for laterite nickel ore hydrometallurgy according to claim 1, characterized in that: The limestone slurry preparation component also includes a limestone powder storage tank and a rotor scale. The limestone powder storage tank is arranged between the second elevator and the rotor scale. The limestone powder storage tank is used to receive the limestone powder transported by the second elevator, and the rotor scale is used to weigh the limestone powder storage tank.

9. The device for preparing limestone slurry and lime milk for laterite nickel ore hydrometallurgy according to claim 1, characterized in that: The lime milk preparation assembly further comprises a slag stripper, which is arranged between the nitrifier and the third delivery pump and is used to extract impurities from the nitrifier.

10. The device for preparing limestone slurry and lime milk for laterite nickel ore hydrometallurgy according to claim 1, characterized in that: The slag extractor has a tenth controller, which is connected to the ninth controller. The tenth controller can control the speed at which the slag extractor extracts impurities according to the second sensing signal.

11. The device for preparing limestone slurry and lime milk for laterite nickel ore hydrometallurgy according to claim 10, characterized in that: The slag stripping machine includes a connected slag stripping motor and a propeller, a part of the propeller is located in the solution contained in the nitrification machine, and the propeller can rotate under the drive of the slag stripping motor to discharge impurities in the solution; the slag stripping motor is connected to the tenth controller, and the tenth controller can control the rotation speed of the propeller driven by the slag stripping motor according to the second sensing signal, thereby adjusting the speed at which the propeller discharges impurities.

Images