Wet-type powdered rock phosphate semi-hydrate-dihydrate acid making process system
By designing an integrated wet phosphate powder semi-water-dihydrate acid production process system, the problems of independent processing links and complex equipment connections in traditional processes are solved, and the efficient acid production and production efficiency of phosphate powder are achieved.
Patent Information
- Application Number
- CN202420055333.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-10
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-01-10
AI Technical Summary
In the traditional phosphate powder semi-water-dihydrate acid production process, each treatment link is independently set, the equipment connection is complex, the operation is complicated, and the adaptability to raw materials is not strong, which affects the process stability and production efficiency.
Design an integrated wet phosphate powder semi-water-dihydrate acid production process system, including grinding feeding system, grinding system, demagnesium demagnesium grading system, concentrate burning system, concentrate storage system, filtration and dehydration system , semi-water reaction system, semi-water filtration system, two-water conversion system and two-water filtration system, and continuous and stable production through automated control.
The overall optimization of the semi-dihydrate acid production process of phosphate powder has been achieved, the production efficiency has been improved, energy consumption and environmental pollution have been reduced, and the stability of the process system and the adaptability to raw materials have been enhanced.
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Figure CN222446440U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mineral processing, in particular to a wet phosphate rock powder semi-water-dihydrate acid making process system. Background Art
[0002] Phosphate ore is a composite material, the main component of which is fluoroapatite. Fluoroapatite contains phosphorus, fluorine, calcium, carbon and other elements, and is bound in a crystal lattice. When decomposed with strong acid (sulfuric acid), the crystal lattice is destroyed, and the components contained in it enter the solution to become a phosphoric acid solution, and the calcium in it combines with sulfuric acid to form a calcium sulfate precipitate. After liquid-solid separation, a phosphoric acid solution and a calcium sulfate solid are obtained. In the production of hemihydrate-dihydrate phosphoric acid process, the decomposition rate of phosphate ore is proportional to the surface area of the particles. The water content of phosphate ore is very important for the water balance in the production process. In order to meet the above two requirements, the phosphate ore needs to be ground and dried. The traditional process mainly uses hot air drying, wind sweeping mill or vertical roller mill to grind the phosphate ore. The quality index of the ore powder is relatively high, and the main indexes are P2O5% ≥ 30.5%, moisture ≤ 1.5%, MgO ≤ 0.7%, and the produced phosphoric acid is of excellent quality. However, in recent years, with the rapid development of the phosphate fertilizer industry, the consumption of phosphate rock has increased sharply, the high-grade phosphate rock resources have been exhausted, the overall grade of phosphate rock has been declining, the impurity content has been increasing, the MER value has increased significantly, and the phosphate rock with a slightly lower grade can no longer meet the needs of the semi-aqueous-dihydrate acid production unit. Due to the high impurity content in the slightly lower-grade phosphate rock, the MER value of the produced phosphoric acid has increased, and it is difficult to produce high-quality phosphoric acid with semi-aqueous-dihydrate phosphoric acid. In production, the flotation method is used to grind and grade the medium and low-grade phosphate rock, remove magnesium, and obtain phosphate concentrate slurry. The P2O5 grade has been improved, MgO has been greatly reduced, and the MER value has been significantly reduced. However, it can only produce ordinary phosphoric acid and phosphate fertilizer products, but cannot produce high-quality phosphoric acid and high-nitrogen and high-nutrient phosphate fertilizer products. To achieve product structure upgrading, it is necessary to study the production of high-quality (low MER value) phosphate concentrate slurry for the production of high-quality phosphoric acid and high-quality phosphate fertilizer products.
[0003] In the traditional phosphate rock semi-water-dihydrate acid production process, each processing link is set up independently, the equipment connection is complicated, the operation is cumbersome, and the adaptability to the raw materials is not strong, which affects the stability and production efficiency of the entire process system. Therefore, it is necessary to develop a new wet phosphate rock semi-water-dihydrate acid production process system to improve production efficiency, reduce energy consumption and reduce environmental pollution. Utility Model Content
[0004] The purpose of the utility model is to provide a wet phosphate rock semi-water-dihydrate acid production process system to solve the problem that in the traditional phosphate rock semi-water-dihydrate acid production process proposed in the above background technology, each processing link is independently set, the equipment connection is complicated, the operation is cumbersome, and the adaptability to raw materials is not strong, which affects the stability and production efficiency of the entire process system.
[0005] To achieve the above-mentioned purpose, the utility model provides a wet phosphate rock semi-water-dihydrate acid production process system, including a grinding feeding system, the output end of the grinding feeding system is connected to the grinding system, the output end of the grinding system is connected to the demagnesium classification system, the output end of the demagnesium classification system is connected to the concentrate thickening system, the output end of the concentrate thickening system is connected to the concentrate storage system, the output end of the concentrate storage system is connected to the filtration and dehydration system, the output end of the filtration and dehydration system is connected to the concentrate feeding system, the output end of the concentrate feeding system is connected to a semi-water reaction system, the output end of the semi-water reaction system is connected to a semi-water filtration system, the output end of the semi-water filtration system is connected to a diwater conversion system, and the output end of the diwater conversion system is connected to a diwater filtration system.
[0006] Preferably, the grinding feeding system includes a raw material storage bin, a batching scale, a silo, a feeder, a conveyor belt and a control system.
[0007] Preferably, the grinding system comprises a grinding mill, a feeding device and a discharging device.
[0008] Preferably, the demagnesium grading system includes a demagnesium trough, an upper screen plate and a lower screen plate are installed in sequence from top to bottom inside the demagnesium trough, one end of the upper screen plate and the lower screen plate are driven to vibrate by a vibration motor, and the other end of the upper screen plate and the lower screen plate are connected to a coarse material discharge port, an inclined surface is provided at the bottom of the demagnesium trough, an outlet is provided at the bottom of the inclined surface, a concentrate conveyor belt is connected to the outside of the outlet, a water washing tank is provided below the output end of the concentrate conveyor belt, a stirring rod is installed inside the water washing tank, a plurality of stirring blades are installed on the outer wall of the stirring rod, the end of the stirring rod is driven to rotate by a stirring motor, and a discharge pipe is connected to the bottom of one end of the water washing tank.
[0009] Preferably, a nozzle is installed on the top inner wall of the demagnesium tank.
[0010] Preferably, a sewage pipe is connected to the bottom of the washing tank, and a filter is installed at the top opening of the sewage pipe.
[0011] Preferably, the concentrate thickening system includes a thickener, a feeding device, a tailings conveying device and a control system.
[0012] Preferably, the filtering and dehydrating system comprises filtering equipment and dehydrating equipment.
[0013] Compared with the prior art, the utility model has the following beneficial effects:
[0014] In the wet phosphate rock semi-water-dihydrate acid-making process system, by adopting the wet phosphate rock semi-water-dihydrate acid-making process system of the utility model, the overall optimization of the semi-water-dihydrate acid-making process of phosphate rock can be achieved. The system integrates the processing links of grinding and feeding, demagnesium classification, concentrate thickening, concentrate storage, filtration and dehydration, semi-water reaction, semi-water filtration, dihydrate conversion and dihydrate filtration, and realizes continuous and stable production through automatic control. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0016] Figure 2 It is a structural schematic diagram of the de-magnesium grading system in the utility model;
[0017] Figure 3 It is a structural schematic diagram of the water washing tank in the utility model.
[0018] The meaning of each number in the figure is:
[0019] 1. Grinding feeding system; 2. Grinding system; 3. De-magnesium grading system; 31. De-magnesium tank; 3101. Nozzle; 32. Upper screening plate; 33. Lower screening plate; 34. Vibrating motor; 35. Inclined surface; 36. Coarse material discharge port; 37. Concentrate conveyor belt; 38. Washing tank; 39. Stirring rod; 391. Stirring blade; 310. Stirring motor; 311. Discharge pipe; 312. Drain pipe; 4. Concentrate thickening system; 5. Concentrate storage system; 6. Filtration and dehydration system; 7. Concentrate feeding system; 8. Semi-water reaction system; 9. Semi-water filtration system; 10. Two-water conversion system; 11. Two-water filtration system. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0021] Example 1
[0022] The utility model provides a wet phosphate rock semi-water-dihydrate acid production process system, such as Figure 1-Figure 3As shown, it includes a grinding feeding system 1, the output end of the grinding feeding system 1 is connected to the grinding system 2, the output end of the grinding system 2 is connected to the demagnesium classification system 3, the output end of the demagnesium classification system 3 is connected to the concentrate thickening system 4, the output end of the concentrate thickening system 4 is connected to the concentrate storage system 5, the output end of the concentrate storage system 5 is connected to the filtration and dehydration system 6, the output end of the filtration and dehydration system 6 is connected to the concentrate feeding system 7, the output end of the concentrate feeding system 7 is connected to the semi-water reaction system 8, the output end of the semi-water reaction system 8 is connected to the semi-water filtration system 9, the output end of the semi-water filtration system 9 is connected to the di-water conversion system 10, and the output end of the di-water conversion system 10 is connected to the di-water filtration system 11.
[0023] In this embodiment, the grinding feeding system 1 includes a raw material storage bin, a batching scale, a silo, a feeder, a conveyor belt and a control system. The raw material storage bin is connected to the batching scale. The batching scale will measure the raw materials according to the required ratio. The batching scale will send the measured raw materials into the silo. The silo plays a buffering role to ensure the continuity of feeding. The outlet of the silo is connected to the mill through the feeder. The feeder is responsible for evenly and continuously sending the raw materials in the silo into the mill. The outlet of the mill is connected to other processing equipment through a conveyor belt, such as a de-magnesium classification system, a concentrate thickening system, etc. The control system is responsible for controlling the entire grinding feeding system, including various sensors, controllers, actuators and other components. The control system can monitor the operating status of each device in real time and adjust the operating parameters of each device according to actual conditions to ensure the stable and efficient operation of the entire system.
[0024] Specifically, the grinding system 2 includes a mill, a feeding device and a discharging device. The output end of the feeding device is directly connected to the feed port of the mill, and the ore is fed into the mill through a conveyor belt or a feeder. The discharge port of the mill is connected to the discharging device, usually through a flange or bolts. The outlet of the discharging device is connected to subsequent processing equipment, such as a classifier, a concentrator, etc. The transmission device of the mill is connected to the motor, and the power is transmitted to the rotor of the mill through a coupling or a reducer, so that the mill can rotate.
[0025] Furthermore, the demagnesium grading system 3 includes a demagnesium trough 31, in which an upper screening plate 32 and a lower screening plate 33 are installed from top to bottom in sequence, one end of the upper screening plate 32 and the lower screening plate 33 are driven to vibrate by a vibration motor 34, and the other end of the upper screening plate 32 and the lower screening plate 33 are connected to a coarse material discharge port 36, a slope 35 is provided at the bottom of the demagnesium trough 31, an outlet is provided at the bottom of the slope 35, a concentrate conveyor belt 37 is connected to the outside of the outlet, a water washing tank 38 is provided below the output end of the concentrate conveyor belt 37, a stirring rod 39 is installed inside the water washing tank 38, a plurality of stirring blades 391 are installed on the outer wall of the stirring rod 39, the end of the stirring rod 39 is driven to rotate by a stirring motor 310, and a discharge pipe 311 is connected to the bottom of one end of the water washing tank 38.
[0026] Furthermore, a nozzle 3101 is installed on the top inner wall of the demagnesizing tank 31 .
[0027] Furthermore, a sewage pipe 312 is connected to the bottom of the washing tank 38 , and a filter screen is installed at the top opening of the sewage pipe 312 .
[0028] Furthermore, the concentrate thickening system 4 includes a thickener, a feeder, a tailings conveying device and a control system. The thickener is the core equipment of the concentrate thickening system and is used to concentrate and separate the concentrate. According to different working principles, thickeners can be divided into various types, such as inclined plate thickeners, center transmission thickeners, etc. The feeder is responsible for feeding the processed concentrate into the thickener, and usually includes equipment such as feed pipes, pumps and valves. The design and configuration of the feeder should be selected and optimized according to the specific situation to ensure uniform and stable feeding of the concentrate. The tailings conveying device is responsible for transporting the tailings discharged from the thickener to the designated location, and usually includes equipment such as conveying pipes, pumps and valves. The design and configuration of the tailings conveying device should be selected and optimized according to the actual situation to ensure the smooth transportation and discharge of the tailings. The control system is responsible for controlling and managing the entire concentrate thickening system, including various sensors, controllers, actuators and other components. The control system can monitor the operating status of each device in real time and adjust the operating parameters of each device according to the actual situation to ensure the stable and efficient operation of the entire system.
[0029] Furthermore, the filtration and dehydration system includes filtration equipment and dehydration equipment. The filtration equipment is used to separate the water and solid in the slurry, including vacuum suction filter, filter press, etc. These equipment use filter cloth, filter cake and other media to separate the solid and liquid in the slurry. The dehydration equipment is used to further reduce the water content of the solid material, including centrifugal dehydrator, natural drying dehydrator, etc. These equipment evaporate or separate the water in the solid material by physical or chemical methods to achieve the purpose of dehydration.
[0030] Example 2
[0031] The utility model also provides a wet phosphate rock semi-water-dihydrate acid production method, the steps comprising:
[0032] (1) The phosphate ore entering the phosphate ore yard is divided into piles according to quality and mixed, and then enters the overflow wet ball mill to be ground to -200 mesh. The 75-80% ore slurry enters the demagnesium device.
[0033] (2) The concentrate from the demagnesium treatment unit is concentrated and then pumped into a concentrate storage tank for storage.
[0034] (3) The concentrate in the concentrate storage tank is fed into the disc pressure filter through a feed pump. The disc pressure filter is pressurized by compressed air from a compressed air storage tank to achieve solid-liquid separation to form a concentrate filter cake that enters the feed buffer silo.
[0035] (4) The filtrate separated from the pressurized bin of the disc filter flows by gravity to the filtrate collection tank and is returned to the system for use through a pump, forming a closed-loop process system for phosphate rock treatment and achieving "zero discharge" of wastewater from the raw material production process of the semi-aqueous-dihydrate phosphoric acid unit.
[0036] (5) The concentrate filter cake (phosphate rock powder with a water content of about 15%) in the feed buffer bin is fed into the reaction tank of the semi-aqueous-dihydrate phosphoric acid unit by a chain plate scale feeding metering system, reacts with sulfuric acid and forms a well-crystallized slurry that enters the semi-aqueous filter. The heat generated by the reaction is removed through the flash evaporation system.
[0037] (6) The liquid separated by the semi-water filter is taken out as the finished acid, and the solid enters the conversion tank, reacts with sulfuric acid and forms a well-crystallized slurry that enters the di-water filter. The heat generated by the reaction is removed through the flash evaporation system.
[0038] (7) The liquid separated by the two-water filter is used as the washing liquid of the semi-water filter, and the solid is slurried with the return water and sent to the tailings pond for storage.
[0039] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.
Claims
1. A wet phosphate rock semi-water-dihydrate acid production process system, comprising a grinding and feeding system (1), characterized in that: The output end of the grinding and feeding system (1) is connected to the grinding system (2), the output end of the grinding system (2) is connected to the demagnesiumization and classification system (3), the output end of the demagnesiumization and classification system (3) is connected to the concentrate thickening system (4), the output end of the concentrate thickening system (4) is connected to the concentrate storage system (5), the output end of the concentrate storage system (5) is connected to the filtration and dehydration system (6), the output end of the filtration and dehydration system (6) is connected to the concentrate feeding system (7), the output end of the concentrate feeding system (7) is connected to the semi-water reaction system (8), the output end of the semi-water reaction system (8) is connected to the semi-water filtration system (9), the output end of the semi-water filtration system (9) is connected to the di-water conversion system (10), and the output end of the di-water conversion system (10) is connected to the di-water filtration system (11).
2. The wet phosphate rock semi-water-dihydrate acid production process system according to claim 1 is characterized by: The grinding feeding system (1) comprises a raw material storage bin, a batching scale, a silo, a feeder, a conveyor belt and a control system.
3. The wet phosphate rock semi-water-dihydrate acid production process system according to claim 1 is characterized in that: The grinding system (2) comprises a grinding machine, a feeding device and a discharging device.
4. The wet phosphate rock semi-water-dihydrate acid production process system according to claim 1, characterized in that: The demagnesium grading system (3) comprises a demagnesium trough (31), wherein an upper sieve plate (32) and a lower sieve plate (33) are sequentially installed inside the demagnesium trough (31) from top to bottom, one end of the upper sieve plate (32) and the lower sieve plate (33) are driven to vibrate by a vibration motor (34), and the other ends of the upper sieve plate (32) and the lower sieve plate (33) are connected to a coarse material discharge port (36), and the bottom of the demagnesium trough (31) is provided with an inclined surface (35), and the inclined surface An outlet is provided at the bottom end of (35), and a concentrate conveyor belt (37) is connected to the outside of the outlet. A water washing tank (38) is provided below the output end of the concentrate conveyor belt (37). A stirring rod (39) is installed inside the water washing tank (38). A plurality of stirring blades (391) are installed on the outer wall of the stirring rod (39). The end of the stirring rod (39) is driven to rotate by a stirring motor (310). A discharge pipe (311) is connected to the bottom of one end of the water washing tank (38).
5. The wet phosphate rock semi-water-dihydrate acid production process system according to claim 4 is characterized in that: A nozzle (3101) is installed on the top inner wall of the demagnesizing tank (31).
6. The wet phosphate rock semi-water-dihydrate acid production process system according to claim 4, characterized in that: The bottom of the water washing tank (38) is connected to a sewage pipe (312), and a filter screen is installed at the top opening of the sewage pipe (312).
7. The wet phosphate rock semi-water-dihydrate acid production process system according to claim 1, characterized in that: The concentrate thickening system (4) comprises a thickener, a ore feeding device, a tailings conveying device and a control system.
8. The wet phosphate rock semi-water-dihydrate acid production process system according to claim 1, characterized in that: The filtering and dehydrating system comprises filtering equipment and dehydrating equipment.