Device for preparing semi-hydrate and dihydrate mixed phosphogypsum roadbed material
By using a multi-stage countercurrent washing and filtration system and a pH-controlled phosphogypsum purification device, the problems of phosphogypsum accumulation and low utilization rate have been solved, and roadbed materials that meet the standards have been prepared, realizing the efficient resource utilization of phosphogypsum.
Patent Information
- Application Number
- CN202423162167.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-20
AI Technical Summary
The recycling rate of phosphogypsum in existing technologies is low, resulting in large-scale accumulation that occupies land and impacts the environment. Furthermore, the calcination modification and granulation processes are complex and costly.
Design a device including a phosphogypsum washing and filtration system to remove soluble phosphorus and fluorine through multi-stage countercurrent washing, using corrosion-resistant materials and combined with pH detection and control, to prepare a hemihydrate and dihydrate mixed phosphogypsum roadbed material.
This method achieves efficient purification of phosphogypsum, produces standard-compliant roadbed materials, solves the problem of phosphogypsum accumulation, improves resource utilization, and reduces process complexity and cost.
Smart Images
Figure CN223629217U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of comprehensive utilization of phosphogypsum relates to a device for preparing semi -water two water mixed phosphogypsum roadbed material. BACKGROUND
[0002] Phosphogypsum is an industrial by-product produced in the process of wet-process phosphoric acid production, which is gray or white, and the main component is calcium sulfate dihydrate or calcium sulfate hemihydrate. About 5 tons of phosphogypsum are discharged for every ton of phosphoric acid produced, and at present, phosphogypsum is mainly stored, only part of which has been utilized, and the recovery rate is low, less than 50%, resulting in the accumulation of phosphogypsum around the phosphorus chemical plant, which not only occupies a large amount of land resources, but also seriously affects the ecological environment.
[0003] CN116986880A discloses a kind of phosphogypsum roadbed material and preparation method, which uses industrial phosphogypsum as raw material, modifies and prepares modified phosphogypsum by calcining, then mixes and granulates to prepare phosphogypsum light aggregate by mixing modified phosphogypsum with water and retarder, and simultaneously prepares powder by part of modified phosphogypsum, mixes phosphogypsum light aggregate and phosphogypsum powder according to certain proportion to prepare phosphogypsum road material, which needs to be calcined and modified, granulated and ground to phosphogypsum, and the process is complex, with high utilization cost. SUMMARY
[0004] The utility model provides a kind of device for preparing semi -water two water mixed phosphogypsum roadbed material, phosphogypsum can be used for roadbed material after phosphorus fluorine purification, and roadbed material meets relevant standard, can be popularized and applied.
[0005] The technical scheme of the utility model is to provide a kind of device for preparing semi -water two water mixed phosphogypsum roadbed material, including at least one phosphogypsum washing and filtering system, phosphogypsum washing and filtering system is equipped with water washing tank, filtering equipment and washing liquid buffer tank, water washing tank is equipped with phosphogypsum feeding port and washing liquid adding port, its discharge port is connected to filtering equipment, filtering equipment liquid phase outlet is connected to filtrate buffer tank, solid phase outlet is transported to the water washing tank of next stage phosphogypsum washing and filtering system or mixer, and the mixer is additionally equipped with solid phase feeding port and liquid phase feeding port except phosphogypsum feeding port, and the mixer discharge port is roadbed material discharge port.
[0006] Optionally, the phosphogypsum washing and filtering system is multi-stage, wherein the solid phase outlet of the upper-stage filtering equipment is connected to the phosphogypsum feeding port of the lower-stage water washing tank, and the liquid outlet of the lower-stage washing liquid buffer tank is connected to the washing liquid adding port of the upper-stage water washing tank.
[0007] Optionally, the phosphogypsum washing and filtering system is three-stage, and the discharge port of the first-stage washing liquid buffer tank is connected to the subsequent water treatment system.
[0008] Optionally, each stage of the water washing tank is provided with a stirring paddle and a pH detector.
[0009] Optionally, the filtering equipment is a filter press, and the filter cloth filtering precision is 10 microns.
[0010] Optionally, the filtering equipment solid phase outlet of the last stage of the phosphogypsum washing and filtering system is connected to the mixer.
[0011] Optionally, the device further comprises a liquid phase preparation tank, which comprises a calcium hydroxide feeding port and a water feeding port, and is provided with a stirring paddle inside, and the discharge port of the liquid phase preparation tank is connected to the liquid phase feeding port of the mixer.
[0012] Optionally, the solid phase material between the devices is transported through a conveying belt, and the liquid phase material is transported through a pipeline valve and a pump.
[0013] The device has the following beneficial effects:
[0014] The device provided by the utility model washes the phosphogypsum through the phosphogypsum washing and filtering system, removes the soluble phosphorus and fluorine, and avoids the soluble phosphorus and fluorine exceeding the standard requirement when the phosphogypsum is used as a roadbed material. In the preferred scheme, the phosphogypsum washing and filtering system is provided with multiple stages, in each stage of washing, the phosphogypsum is first mixed and stirred with the washing liquid, the dissolution of the soluble substance is promoted, and then the solid-liquid separation is carried out through the filtering equipment. In the washing process, the filtrate of the filtering equipment of the last stage is reused in the water washing tank of the previous stage as the washing liquid, the water consumption is reduced, and the filtrate after the first washing and filtering is introduced into the subsequent water treatment system for recycling treatment. In the multiple-stage countercurrent washing process, the pH detector can be provided in the water washing tank and connected to the control system, the pH of the system is accurately controlled, and the devices can adopt corrosion-resistant and wear-resistant materials, which can resist the corrosion and wear of the material to the greatest extent, and the device can realize long-period stable operation.
[0015] The device provided by the utility model washes and purifies the phosphogypsum, the purified phosphogypsum is transported to the mixer, is fully mixed with the added fly ash, cement and light calcium oxide solution, and the like, and the roadbed material with uniform composition can be prepared, the soluble phosphorus and fluorine in the roadbed material meet the requirement, and the material is mixed and then is paved, which is more uniform than direct on-site paving, and the performance of the material is stable. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 The utility model discloses a structure schematic diagram. DETAILED DESCRIPTION
[0017] The embodiments of the utility model will be described in detail below in combination with the embodiments and drawings, but the person skilled in the art will understand that the following embodiments are only for illustrating the utility model and should not be regarded as limiting the scope of the utility model.
[0018] As Figure 1 shown, the utility model provides a kind of preparation semi-water two water mixed phosphogypsum roadbed material's device, including at least one phosphogypsum washing filtration system, phosphogypsum washing filtration system is equipped with water washing tank 1, filter equipment 2 and washing liquid buffer tank 3, water washing tank is equipped with phosphogypsum feeding port and washing liquid adding port, its discharge port is connected to filter equipment, filter equipment liquid phase outlet is connected to filtrate buffer tank, solid phase outlet is transported to the water washing tank of next stage phosphogypsum washing filtration system or mixer 4, mixer 4 is equipped with solid phase feeding port and liquid phase feeding port in addition to phosphogypsum feeding port, and the discharge port of mixer 4 is roadbed material discharge port.
[0019] In some embodiments, the phosphogypsum washing filtration system is multi-stage, wherein the solid phase outlet of the filter equipment of the upper stage is connected to the phosphogypsum feeding port of the water washing tank of the lower stage, and the filtrate outlet of the washing liquid buffer tank of the lower stage is connected to the washing liquid adding port of the water washing tank of the upper stage. By multi-stage countercurrent washing, water can be fully utilized by introducing water only in the last stage water washing tank.
[0020] In a more preferred embodiment, the phosphogypsum washing filtration system is three-stage, and the discharge port of the washing liquid buffer tank of the first stage is connected to a subsequent water treatment system. The water can be discharged to a sewage treatment plant for treatment, or the phosphorus and fluorine therein can be recovered by self-treatment.
[0021] In some embodiments, each water washing tank is provided with a stirring paddle and a pH detector. The phosphogypsum and washing liquid can be fully mixed and washed, and the material of the water washing tank is preferably 316L stainless steel. The device can also be provided with a controller, the signal output end of the pH detector is connected to the signal input end of the controller, and the signal output end of the controller controls the addition amount of phosphogypsum and washing liquid, so as to realize accurate control of the pH of the system. The controller can be a DCS controller.
[0022] In some embodiments, the filter equipment 2 is a filter press, the metal material part of the filter press is made of 316L stainless steel, and the non-metal part is made of PP material. The filter cloth can be selected from PP3927 dacron cloth, and the filtration precision is 10 microns. The washing liquid buffer tank 3 is a tank with a stirring paddle, which is also provided with a pH detector and is remotely transmitted to the controller, so as to facilitate the control of the pH of the system. The material of the washing liquid buffer tank is 316L stainless steel.
[0023] In some embodiments, the solid phase outlet of the filter equipment of the last stage phosphogypsum washing filtration system is connected to the mixer 4. The mixer can be a rotary mixer, which mixes various raw materials of roadbed material, and the obtained material is directly used for construction paving.
[0024] In some embodiments, the device further comprises a liquid phase preparation tank 5, which comprises a calcium hydroxide feeding port and a water feeding port, and a stirring paddle is arranged in the liquid phase preparation tank, and a discharge port of the liquid phase preparation tank is connected to a liquid phase feeding port of the mixer.
[0025] In some embodiments, solid phase materials between devices of the device are transported by a conveying belt, and liquid phase materials are transported by pipes, valves and pumps.
[0026] When the device is used to prepare roadbed materials, the hemihydrate phosphogypsum and dihydrate phosphogypsum are mixed in a proportion, then are put into a washing tank, water or filtrate of a later stage is added to mix and wash, solid-liquid separation is performed by using a filtering device, the obtained filter residue is washed phosphogypsum, the washed phosphogypsum is further washed to meet the requirements, then is put into a mixer to mix with calcium hydroxide solution, fly ash, cement and other raw materials to prepare roadbed materials, and the roadbed materials are applied to paving, the problem of phosphogypsum treatment can be solved, and resource utilization is realized.
[0027] The above embodiments describe the preferred embodiments of the device, but the device is not limited thereto. Within the technical concept of the device, various simple modifications can be made to the technical scheme of the device, including combination of various technical features in any other manner, and the simple modifications and combinations should also be regarded as the disclosed content of the device, and all belong to the protection scope of the device. Therefore, the protection scope of the device should be subject to the appended claims.
Claims
1. An apparatus for preparing a semi-hydrated dihydrate mixed phosphogypsum road base material, characterised in that: The invention discloses a phosphogypsum washing and filtering system, which comprises at least one stage of phosphogypsum washing and filtering system, and the phosphogypsum washing and filtering system is provided with a water washing tank (1), a filtering device (2) and a washing liquid buffer tank (3). The water washing tank is provided with a phosphogypsum feeding port and a washing liquid feeding port, and the discharge port of the water washing tank is connected to the filtering device. The liquid phase outlet of the filtering device is connected to the filtrate buffer tank, and the solid phase outlet is connected to the water washing tank of the next stage of phosphogypsum washing and filtering system or a mixer (4). The mixer (4) is provided with a solid phase feeding port and a liquid phase feeding port in addition to the phosphogypsum feeding port, and the discharge port of the mixer (4) is a roadbed material discharge port.
2. The apparatus for preparing semi-hydrated dihydrate mixed phosphogypsum roadbed material according to claim 1, characterized in that: The phosphogypsum washing and filtering system is multi-stage, wherein the solid phase outlet of the filtering device (2) of the upper stage is connected to the phosphogypsum feeding port of the water washing tank (1) of the lower stage, and the liquid outlet of the washing liquid buffer tank (3) of the lower stage is connected to the washing liquid feeding port of the water washing tank (1) of the upper stage.
3. The apparatus for preparing semi-hydrated dihydrate mixed phosphogypsum roadbed material according to claim 2, characterized in that: The phosphogypsum washing and filtering system is three-stage, and the discharge port of the washing liquid buffer tank (3) of the first stage is connected to a subsequent water treatment system.
4. The apparatus for preparing semi-hydrated dihydrate mixed phosphogypsum roadbed material according to claim 1, characterized by: Each water washing tank is provided with a stirring paddle and a pH detector.
5. The apparatus for preparing semi-hydrated dihydrate mixed phosphogypsum roadbed material according to claim 1, characterized by: The filtering device (2) is a filter press, and the filtering precision of the filter cloth is 10 microns.
6. The device for preparing the semi-water di-water mixed phosphogypsum roadbed material according to any one of claims 1 to 5, characterized in that: The solid phase outlet of the filtering device of the last stage of phosphogypsum washing and filtering system is connected to the mixer (4).
7. The device for preparing the semi-water di-water mixed phosphogypsum roadbed material according to any one of claims 1 to 5, characterized in that: The device further comprises a liquid phase preparation tank, which comprises a calcium hydroxide feeding port and a water feeding port, and is provided with a stirring paddle in the tank, and the discharge port of the tank is connected to the liquid phase feeding port of the mixer.
8. The apparatus for preparing semi-hydrated dihydrate mixed phosphogypsum roadbed material according to claim 1, characterized by: The solid phase materials between the devices are conveyed by a conveying belt, and the liquid phase materials are conveyed by a pipeline valve and a pump.