Crystallization apparatus for high concentration salts in precious metal recovery processes

Abstract

The application relates to integration of high-salt waste liquid crystallization and sludge drying devices, in particular, a crystallization device for high-concentration salt in a noble metal recovery process by utilizing flue gas waste heat. The device solves problems of industrial waste water and waste gas and the like. The device comprises a base, a rotary crystallization roller, roller support bearings, bearing support seats, a rotary large gear and a rotary crystallization furnace driving motor, a layer of outer cover jacket is wrapped outside the rotary crystallization roller, an air inlet pipe is arranged at the left side of the outer cover jacket, and a furnace waste heat circulation pipe is connected to the feed inlet of the rotary crystallization roller at the right side. A main variable moment screw is arranged in the rotary crystallization roller, a driving motor of the main variable moment screw is arranged at the right side of the rotary crystallization roller, a discharge port is arranged at the tail end of the rotary crystallization roller, and a gas-solid separator is arranged at the discharge port, and waste gas separated out is connected to an original quench tower system. A new way of treating waste with waste and recycling waste is opened, and 'eating dry and squeezing out' on the industrial chain is completed, so that a win-win of economic development and resource and environment protection is realized.

Description

TECHNICAL FIELD

[0001] The application relates to integration of high-salt waste liquid crystallization and sludge drying devices, in particular to a crystallization device for high-concentration salt in a noble metal recovery process. BACKGROUND

[0002] At present, the industrial wastewater treatment status is that three-effect evaporation facilities are adopted for treatment, and 10% of the mother liquor of the industrial wastewater cannot be secondarily evaporated in the treatment process, the salt content of the mother liquor accounts for 41%, main components are sodium chloride and nitrate, the existing highest heating temperature of the three-effect evaporation system is 106 DEG C, when the temperature is designed to be increased, the high-speed centrifugal wind in the system cannot be borne, resulting in the headache problem existing in the three-effect steam system of the existing industrial wastewater, on the other hand, before the three-effect evaporation, the industrial wastewater is softened in the pretreatment process, and the sludge generated by plate and frame filter pressing has a water content of 78%. SUMMARY

[0003] In order to overcome the above-mentioned defects of the prior art, the application provides a crystallization device for high-concentration salt in a noble metal recovery process, which fully utilizes a large amount of waste heat in flue gas and adopts an existing high-temperature heat source to completely solve the problems of sludge drying treatment with high water content in the existing noble metal industry and crystallization of high-salt waste liquid generated after three-effect evaporation of industrial wastewater.

[0004] The technical scheme adopted by the application to solve the technical problems is that the crystallization device for high-concentration salt in the noble metal recovery process comprises a base, a rotary crystallization roller, roller support bearings, bearing support seats, a rotary large gear and a rotary crystallization furnace driving motor, three roller support bearings are arranged on the rotary crystallization roller, each roller support bearing corresponds to a bearing support seat, a rotary large gear is arranged at the middle position of the rotary crystallization roller, and the rotary crystallization roller is driven to rotate by the rotary large gear through the rotary crystallization furnace driving motor.

[0005] A wet sludge adding port is arranged at the end of the rotary crystallization roller, a feeding screw conveyor and a slurry pump are arranged in matching relation to the wet slurry adding port, slurry conveyed by the feeding screw conveyor is pumped into the rotary crystallization roller through the slurry pump.

[0006] A jacket is wrapped outside the rotary crystallization roller, an air inlet pipe is arranged at the left side of the jacket, and a furnace waste heat circulation pipe connected to the feeding end of the rotary crystallization roller is arranged at the right side of the jacket.

[0007] A main variable-torque screw is arranged in the rotary crystallization roller, a driving motor of the main variable-torque screw is arranged at the right side of the rotary crystallization roller, a discharge port is arranged at the end of the rotary crystallization roller, and a gas-solid separator is arranged at the discharge port, and waste gas separated out is connected to an original quenching tower system.

[0008] Further, the rotary crystallization drum is in low slope shape with horizontal angle of 4-10 degrees. The fast closed type is adopted, and the internal spiral grading device is arranged, and the drum body is in low slope shape of 4 degrees to adapt to different moisture of sludge and high salt waste liquid.

[0009] Further, the flue gas adjusting valve is arranged on the air inlet pipe.

[0010] The present application has the following beneficial effects: 1. In the rotary crystallization drum with good sealing performance, the crystallization and drying medium adopts flue gas, so that the crystallization and drying operation are carried out under the condition of negative pressure and oxygen deficiency, and the possibility of explosion of sludge waste liquid in the crystallization and drying process is eliminated. 2. The cost of drying sludge and waste liquid crystallization by using the waste heat of flue gas is low. 3. The transportation cost and the cost of sludge entrusted to the third party are reduced. 4. The problem that the existing high salt waste liquid in China cannot enter the three-effect evaporation again is solved. 5. The fine dust and gas in the flue gas still enter the original waste gas treatment quenching tower system during the drying process, forming a closed circuit. 6. The device is simple and efficient, has small occupied area, and is convenient to install and maintain. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the present application.

[0012] Figure 2 It is a perspective view of the present application without the outer cover jacket.

[0013] Figure 3 It is a partial sectional view of the present application.

[0014] Figure 4 It is a schematic diagram of the flue gas circulation channel of the present application.

[0015] Base 1, rotary crystallization drum 2, drum support bearing 3, bearing support seat 4, rotary gear 5, rotary crystallization furnace driving motor 6, feeding screw conveyor 7, slurry pump 8, outer cover jacket 9, air inlet pipe 10, furnace internal waste heat circulation pipe 11, dust removal door 12, main variable pitch screw 13, main variable pitch screw driving motor 14, discharge port 15. DETAILED DESCRIPTION

[0016] The present application will be further described below in combination with the drawings and examples.

[0017] Wherein the same parts are indicated by the same reference numerals. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "inner" and "outer" refer to the directions towards or away from the geometric center of a particular part, and the drawings are in a very simplified form and use non-precise ratios, only to facilitate, clearly assist the purpose of explaining the embodiments of the present application. EMBODIMENT

[0018] As Figure 1 , 2 shown, the high concentration salt crystallization device in noble metal recovery process, including base 1, rotary crystallization drum 2, drum support bearing 3, bearing support seat 4, rotary gear 5 and rotary crystallization furnace driving motor 6, rotary crystallization drum 2 is equipped with three drum support bearings 3, each drum support bearing 3 corresponds to a bearing support seat 4, rotary crystallization drum 2 middle position is equipped with rotary gear 5, rotary crystallization drum 2 is driven by rotary crystallization furnace driving motor 6 through rotary gear 5 rotation.

[0019] Rotary crystallization drum is low slope, and the horizontal angle is 4°. It adopts fast closed type, and the inside is provided with spiral grading device, the barrel is low slope 4 degrees, to adapt to different moisture and high salt waste liquid. The end of rotary crystallization drum 2 is provided with wet sludge adding port, and the matching feeding screw conveyor 7 and slurry pump 8 are arranged, the slurry conveyed by feeding screw conveyor 7 is pumped into rotary crystallization drum through slurry pump 8, and the feeding screw conveyor is 20° with the horizontal plane.

[0020] A layer of cover jacket 9 is wrapped outside rotary crystallization drum 2, the left side of cover jacket 9 is provided with air inlet pipe 10, the air inlet pipe is provided with flue gas regulating valve, the right side is provided with in-furnace waste heat circulation pipe 11 connected to the feeding end of rotary crystallization drum. The lower end of cover jacket is provided with dust removal door 12, at the same time, cover jacket avoids drum support bearing 3, bearing support seat 4, rotary gear 5 and rotary crystallization furnace driving motor 6 and other equipment, and forms a closed circulation channel inside.

[0021] As Figure 3 shown, the rotary crystallization drum 2 is provided with main variable moment spiral 13, and the main variable moment spiral driving motor 14 is located at the right side of rotary crystallization drum 2, and the rotary crystallization drum 2 is provided with discharge port 15, and the discharge port 15 is provided with gas-solid separator, and the separated waste gas is connected to the original quenching tower system.

[0022] The application discloses a kind of intelligent multifunctional high salt crystallizer using waste heat, handles three-effect evaporation after mother liquor and drying sludge integrated device, adopts two-stage loop, as Figure 4 Shown, first waste heat is introduced into cover jacket by induced draft fan, then is introduced from the other end of cover jacket and is contacted with material in rotary crystallization drum, and the waste gas is treated again by original waste gas treatment system. It opens up a new way of waste treatment and waste recycling, and completes the "eat dry and squeeze" in the industrial chain, which realizes the win-win of economic development and resource and environment protection.

[0023] It is composed of rotary crystallization drum, screw feeder and flue gas regulating valve. Flue gas with 550℃ temperature is used as medium for drying and crystallization, which is introduced into the intelligent multifunctional high-salt crystallizer through the induced draft fan. The left end of the intelligent multifunctional high-salt crystallizer is provided with a wet sludge adding port, and the outlet of the right end of the intelligent multifunctional high-salt crystallizer is directly connected with a bagging device. The tail gas is connected with the original waste gas treatment system through the gas-solid separator at the top of the right end outlet.

[0024] For the sake of clarity, not all of the features of an actual implementation are described in this document, in the following description, numerous specific details are set forth to provide a thorough understanding of the present application. However, it should be understood that the present application can be practiced without these specific details. In other instances, well-known methods, structures and techniques have not been described in detail in order to avoid obscuring the present application. It should also be understood that the terminology used herein is for the purpose of describing only the present application and is not intended to be limiting.

Claims

1. A crystallization device for high concentration salt in precious metal recovery process, comprising a base, a rotary crystallization drum, a drum support bearing, a bearing support seat, a rotary large gear and a rotary crystallization furnace driving motor, characterized in that: The rotary crystallization roller is provided with three roller support bearings, each of which corresponds to a bearing support seat, and a rotary large gear is arranged at the middle position of the rotary crystallization roller, and the rotary crystallization roller is driven to rotate by the rotary large gear driven by a rotary crystallization furnace driving motor; The rotary crystallization roller is provided with three roller support bearings, each of which corresponds to a bearing support seat, and a rotary large gear is arranged at the middle position of the rotary crystallization roller, and the rotary crystallization roller is driven to rotate by the rotary large gear driven by a rotary crystallization furnace driving motor; The rotary crystallization roller is provided with three roller support bearings, each of which corresponds to a bearing support seat, and a rotary large gear is arranged at the middle position of the rotary crystallization roller, and the rotary crystallization roller is driven to rotate by the rotary large gear driven by a rotary crystallization furnace driving motor; The rotary crystallization roller is provided with three roller support bearings, each of which corresponds to a bearing support seat, and a rotary large gear is arranged at the middle position of the rotary crystallization roller, and the rotary crystallization roller is driven to rotate by the rotary large gear driven by a rotary crystallization furnace driving motor; The rotary crystallization roller is provided with three roller support bearings, each of which corresponds to a bearing support seat, and a rotary large gear is arranged at the middle position of the rotary crystallization roller, and the rotary crystallization roller is driven to rotate by the rotary large gear driven by a rotary crystallization furnace driving motor; 2. The apparatus for crystallization of high concentration salt in the precious metal recovery process according to claim 1, characterized in that: The rotary crystallization roller is provided with three roller support bearings, each of which corresponds to a bearing support seat, and a rotary large gear is arranged at the middle position of the rotary crystallization roller, and the rotary crystallization roller is driven to rotate by the rotary large gear driven by a rotary crystallization furnace driving motor; The rotary crystallization roller is provided with three roller support bearings, each of which corresponds to a bearing support seat, and a rotary large gear is arranged at the middle position of the rotary crystallization roller, and the rotary crystallization roller is driven to rotate by the rotary large gear driven by a rotary crystallization furnace driving motor; The rotary crystallization roller is provided with three roller support bearings, each of which corresponds to a bearing support seat, and a rotary large gear is arranged at the middle position of the rotary crystallization roller, and the rotary crystallization roller is driven to rotate by the rotary large gear driven by a rotary crystallization furnace driving motor; The rotary crystallization roller is provided with three roller support bearings, each of which corresponds to a bearing support seat, and a rotary large gear is arranged at the middle position of the rotary crystallization roller, and the rotary crystallization roller is driven to rotate by the rotary large gear driven by a rotary crystallization furnace driving motor; The rotary crystallization roller is provided with three roller support bearings, each of which corresponds to a bearing support seat, and a rotary large gear is arranged at the middle position of the rotary crystallization roller, and the rotary crystallization roller is driven to rotate by the rotary large gear driven by a rotary crystallization furnace driving motor; The rotary crystallization roller is provided with three roller support bearings, each of which corresponds to a bearing support seat, and a rotary large gear is arranged at the middle position of the rotary crystallization roller, and the rotary crystallization roller is driven to rotate by the rotary large gear driven by a rotary crystallization furnace driving motor; The rotary crystallization roller is provided with three roller support bearings, each of which corresponds to a bearing support seat, and a rotary large gear is arranged at the middle position of the rotary crystallization roller, and the rotary crystallization roller is driven to rotate by the rotary large gear driven by a rotary crystallization furnace driving motor; The rotary crystallization roller is provided with three roller support bearings, each of which corresponds to a bearing support seat, and a rotary large gear is arranged at the

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