Ardealite harmless treatment system

Abstract

The invention discloses a phosphogypsum harmless treatment system which comprises a phosphogypsum conveying belt scale, a moisture content detector, a phosphogypsum storage bin, a powder bin, a powder conveyor, an anionic polymer liquid bin, anionic polymer liquid conveying equipment, a water distribution device, a spraying device, a stirrer and a control module. According to the present invention, the mixing ratio can be intelligently and automatically adjusted and controlled according to the initial water content of phosphogypsum, and the amount of the powder material, the amount of the anionic polymer liquid and the amount of the water are output; the powder, the anionic polymer liquid and the water diluent cooperate with one another, so that harmless treatment of the ardealite is realized; the acidity of the ardealite is reduced, the pH value is increased, the content of water-soluble fluorine and total phosphorus is reduced, the industrial solid waste standard is met, and harmless treatment of the ardealite with the annual yield of 1 million tons is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of industrial solid waste treatment and resource utilization, and particularly relates to a harmless treatment system for phosphogypsum. Background Art

[0002] Phosphogypsum is a by-product produced by the wet process for producing phosphoric acid, and its main component is calcium sulfate dihydrate. At present, the harmless treatment of phosphogypsum mainly removes and reduces harmful substances in phosphogypsum through chemical and biological processes or process combinations such as water washing, flotation, roasting, and neutralization, making it transform into insoluble or hardly soluble substances and be fixed, so that the treated phosphogypsum meets the requirements of relevant utilization indexes.

[0003] Phosphogypsum can be harmlessly treated by using anionic polymers. The harmlessly treated phosphogypsum can be used as a raw material that meets the requirements of relevant product standards and can continue to be used in production, or can be stored or landfilled as a resource. For example, it can be used to produce building materials, road materials, industrial raw materials, soil conditioners, ecological restoration materials, etc. However, in the prior art, there is a lack of a system for harmlessly treating phosphogypsum with anionic polymers.

[0004] For example, the Chinese patent with the publication number CN115625181A discloses a harmless treatment system for phosphogypsum, which belongs to the technical field of phosphogypsum treatment. The system includes: a thickener for concentrating phosphogypsum, with the clear liquid used as phosphogypsum return water and the sludge sent to a first belt filter; the first belt filter for filtering and washing the sludge three times in sequence, collecting the third washing drainage and sending it to the second washing area, collecting the second washing drainage and sending it to the first washing area, collecting the first washing drainage and sending it to a washing water treatment device, and collecting the filtrate as phosphogypsum return water; using the filter press filtrate and the second filter washing drainage as the third washing water; a re-slurry neutralization tank for mixing lime milk, dry gypsum, the second filter washing drainage, and the filter press filtrate to obtain a gypsum slurry; a second belt filter for filtering and washing the gypsum slurry three times in sequence, and combining the output filtrate and the washing water drainage as the second filter washing drainage; a washing water treatment device for neutralizing and filter pressing the first washing drainage output by the first belt filter to obtain a filter press filtrate. However, this patent is a water washing and filtering type harmless treatment and is not suitable for harmlessly treating phosphogypsum with a curing agent.

[0005] Therefore, a system for harmlessly treating phosphogypsum with anionic polymers is needed to realize the reuse of phosphogypsum. Summary of the Invention

[0006] To solve the above technical problems, the present invention provides a harmless treatment system for phosphogypsum.

[0007] The present invention is achieved through the following technical solutions.

[0008] A harmless treatment system for phosphogypsum provided by the present invention includes: a phosphogypsum conveyor belt scale, a moisture content detector, a phosphogypsum storage bin, a powder bin, a powder conveyor, an anionic polymer liquid bin, an anionic polymer liquid conveying equipment, a water distribution device, a spraying device, a mixer and a control module; the control module is used to receive the data of the moisture content detector and control the conveying speed and quantity of the phosphogypsum conveyor belt scale, the flow rate of the anionic polymer liquid, the flow rate of the water distribution device and the conveying quantity of the powder conveyor;

[0009] The moisture content detector is installed in the phosphogypsum storage bin. The phosphogypsum storage bin is connected to the mixer through the phosphogypsum conveyor belt scale. The powder bin is connected to the mixer through the powder conveyor. The anionic polymer liquid bin is connected to the liquid conveying equipment. The anionic polymer liquid conveying equipment is connected to the water distribution device. The water distribution device is connected to the spraying device. The spraying device is installed in the mixer. The control module is respectively connected to the phosphogypsum conveyor belt scale, the powder conveyor and the anionic polymer liquid conveying equipment. The moisture content detector and the control module are wirelessly communicatively connected.

[0010] Preferably, it further includes: a finished product conveyor belt and a finished product receiving platform; the finished product receiving platform is connected to the mixer through the finished product conveyor belt.

[0011] Preferably, the control module includes: a wireless communication unit, a belt scale control unit, an anionic polymer liquid flow rate control unit, a water distribution device control unit and a powder conveyor control unit;

[0012] The wireless communication unit is used to receive the data of the moisture content detector and obtain the moisture content of the phosphogypsum;

[0013] The belt scale control unit is used to adjust the conveying speed and quantity of the phosphogypsum conveyor belt scale according to the moisture content of the phosphogypsum;

[0014] The anionic polymer liquid flow rate control unit is used to control the flow rate of the anionic polymer liquid according to the moisture content of the phosphogypsum;

[0015] The water distribution device control unit is used to control the flow rate of the water distribution device according to the moisture content of the phosphogypsum;

[0016] The powder conveyor control unit is used to control the conveying quantity of the powder conveyor according to the moisture content of the phosphogypsum.

[0017] Preferably, the expression for controlling the flow rate of the anionic polymer liquid according to the moisture content of the phosphogypsum is:

[0018] β=(1 - α)×B×δ

[0019] Among them, β is the flow rate of the anionic polymer liquid, B is the stirring rate of the mixer, α is the moisture content of phosphogypsum, and δ is the liquid ratio in the curing agent.

[0020] Preferably, the expression for controlling the flow rate of the water distribution device according to the moisture content of phosphogypsum is:

[0021] η = (A - α) × B + B × (1 - α) × γ × A

[0022] Among them, η is the flow rate of the water distribution device, B is the stirring rate of the mixer, α is the moisture content of phosphogypsum, γ is the powder ratio in the curing agent, and A is the moisture content of the finished product.

[0023] Preferably, the expression for controlling the conveying amount of the powder conveyor according to the moisture content of phosphogypsum is:

[0024] θ = (1 - α) × B × γ

[0025] Among them, θ is the conveying amount of the powder conveyor, B is the stirring rate of the mixer, α is the moisture content of phosphogypsum, and γ is the powder ratio in the curing agent.

[0026] Preferably, the moisture content detector includes: an FDR sensor, a stainless steel probe, an integrated digital temperature sensor, a detector main control unit, and a detector communication unit; the FDR sensor is connected to the stainless steel probe, the integrated digital temperature sensor is connected to the stainless steel probe, and the detector main control unit is respectively connected to the FDR sensor, the integrated digital temperature sensor, and the detector communication unit;

[0027] The FDR sensor is used to determine the humidity of phosphogypsum;

[0028] The stainless steel probe is used to conduct electromagnetic signals;

[0029] The integrated digital temperature sensor is used to detect the temperature of phosphogypsum;

[0030] The detector main control unit is used to control the moisture content detector;

[0031] The detector communication unit is used to realize the wireless communication of the moisture content detector.

[0032] Preferably, the phosphogypsum conveyor belt scale includes: a weighing sensor and a speed sensor; the weighing sensor and the speed sensor are respectively connected to the control module;

[0033] The weighing sensor is used to weigh the weight of phosphogypsum on the phosphogypsum conveyor belt scale;

[0034] The speed sensor is used to weigh the conveying speed of the phosphogypsum conveyor belt scale.

[0035] Preferably, the anion polymer liquid delivery equipment includes: a flow meter and a flow rate sensor; the flow meter and the flow rate sensor are respectively connected to a control module;

[0036] The flow meter is used to measure the flow rate of the anion polymer liquid and calculate the liquid weight;

[0037] The flow rate sensor is used to measure the flow rate of the anion polymer liquid.

[0038] Preferably, the powder conveyor includes: a feed valve, a metering kettle, a weighing unit, and a discharge valve;

[0039] The feed valve is used to convey the powder in the powder silo to the metering kettle;

[0040] The metering kettle is used to meter the powder;

[0041] The weighing unit is used to weigh the powder weight in the metering kettle;

[0042] The discharge valve is used to convey the powder in the metering kettle to the mixer.

[0043] The beneficial effects of the present invention are as follows:

[0044] 1. It can intelligently adjust the control ratio according to the initial water content of phosphogypsum, and output the dosage of powder materials, the dosage of anion polymer liquid, and the dosage of water;

[0045] 2. The powder, anion polymer liquid, and water diluent cooperate to achieve the harmless treatment of phosphogypsum;

[0046] 3. It reduces the acidity of phosphogypsum, increases the pH value, reduces the water-soluble fluorine and total phosphorus content, meets the industrial solid waste standard, and realizes the harmless treatment of 1 million tons of phosphogypsum per year. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is the schematic diagram of the system structure provided by the embodiment of the present invention Figure 1 ;

[0048] Figure 2 is the schematic diagram of the system structure provided by the embodiment of the present invention Figure 2 .

[0049] In the figure, 1 - phosphogypsum storage bin, 2 - phosphogypsum conveyor belt scale, 3 - mixer, 4 - powder conveyor, 5 - powder silo, 6 - weighing unit, 7 - finished product conveyor belt, 8 - finished product receiving platform. DETAILED DESCRIPTION OF THE INVENTION

[0050] The technical solutions of the present invention will be further described below, but the scope of protection claimed is not limited thereto.

[0051] As Figure 1 , 2 shown, a harmless treatment system for phosphogypsum includes: a phosphogypsum conveyor belt scale 2, a moisture content detector, a phosphogypsum storage bin 1, a powder bin 5, a powder conveyor 4, an anionic polymer liquid bin, an anionic polymer liquid conveying equipment, a water distribution device, a spraying device, a mixer 3 and a control module; the control module is used for receiving the data of the moisture content detector and controlling the conveying speed and quantity of the phosphogypsum conveyor belt scale, the flow rate of the anionic polymer liquid, the flow rate of the water distribution device and the conveying quantity of the powder conveyor;

[0052] The moisture content detector is installed in the phosphogypsum storage bin 1, the phosphogypsum storage bin 1 is connected to the mixer 3 through the phosphogypsum conveyor belt scale 2, the powder bin 5 is connected to the mixer 3 through the powder conveyor 4, the anionic polymer liquid bin is connected to the liquid conveying equipment, the anionic polymer liquid conveying equipment is connected to the water distribution device, the water distribution device is connected to the spraying device, the spraying device is installed in the mixer 3, the control module is respectively connected to the phosphogypsum conveyor belt scale 2, the powder conveyor 4 and the anionic polymer liquid conveying equipment, and the moisture content detector and the control module are wirelessly communicatively connected.

[0053] The phosphogypsum storage bin 1 is used for temporarily storing phosphogypsum, and the moisture content detector is installed in the phosphogypsum storage bin 1 to detect the moisture content of the phosphogypsum in the phosphogypsum storage bin 1.

[0054] The control module then adjusts the conveying speed and quantity of the phosphogypsum conveyor belt scale 2, the flow rate of the anionic polymer liquid, the flow rate of the water distribution device and the conveying quantity of the powder conveyor 4 according to the moisture content of the phosphogypsum in the phosphogypsum storage bin 1.

[0055] Among them, the phosphogypsum conveyor belt scale 2 conveys the phosphogypsum in the phosphogypsum storage bin 1 into the mixer 3, the anionic polymer liquid conveying equipment conveys the anionic polymer liquid in the anionic polymer liquid bin to the water distribution device, the water in the water distribution device is mixed with the anionic polymer liquid, and then the diluted anionic polymer liquid is sprayed into the mixer 3 through the spraying device, and the phosphogypsum, the powder and the anionic polymer liquid are uniformly mixed in the mixer 3 to obtain a finished product, that is, the harmlessly treated phosphogypsum.

[0056] In this embodiment, the powder is calcium hydroxide powder.

[0057] A harmless treatment system for phosphogypsum further includes: a finished product conveyor belt 7 and a finished product receiving platform 8; the finished product receiving platform 8 is connected to the mixer 3 through the finished product conveyor belt 7.

[0058] The finished product in the mixer 3 is conveyed to the finished product receiving platform 8 through the finished product conveyor belt 7 for storing the treated phosphogypsum.

[0059] In this embodiment, a funnel is provided on the finished product receiving platform 8, and materials are transferred to the transport vehicle through the funnel.

[0060] The control module includes: a wireless communication unit, a belt scale control unit, an anionic polymer liquid flow rate control unit, a water distribution device control unit, and a powder conveyor control unit;

[0061] The wireless communication unit is used to receive data from the moisture content detector and obtain the moisture content of phosphogypsum;

[0062] The belt scale control unit is used to adjust the conveying speed and conveying volume of the phosphogypsum conveying belt scale 2 according to the moisture content of phosphogypsum;

[0063] The anionic polymer liquid flow rate control unit is used to control the flow rate of the anionic polymer liquid according to the moisture content of phosphogypsum;

[0064] The expression for controlling the flow rate of the anionic polymer liquid according to the moisture content of phosphogypsum is:

[0065] β = (1 - α) × B × δ

[0066] Where β is the flow rate of the anionic polymer liquid, B is the stirring rate of the mixer, α is the moisture content of phosphogypsum, and δ is the liquid ratio in the curing agent.

[0067] In this embodiment, the anionic polymer liquid flow rate control unit adjusts the system through the PID control algorithm, that is, the proportional P, integral I, and derivative D links, to achieve a stable flow rate.

[0068] The water distribution device control unit is used to control the flow rate of the water distribution device according to the moisture content of phosphogypsum;

[0069] The expression for controlling the flow rate of the water distribution device according to the moisture content of phosphogypsum is:

[0070] η = (A - α) × B + B × (1 - α) × β × A

[0071] Where η is the flow rate of the water distribution device, B is the stirring rate of the mixer, α is the moisture content of phosphogypsum, γ is the powder ratio in the curing agent, and A is the moisture content of the finished product.

[0072] The powder conveyor control unit is used to control the conveying volume of the powder conveyor according to the moisture content of phosphogypsum.

[0073] The expression for controlling the conveying volume of the powder conveyor according to the moisture content of phosphogypsum is:

[0074] θ = (1 - α) × B × γ

[0075] Among them, θ is the conveying capacity of the powder conveyor, B is the stirring rate of the mixer, β is the moisture content of the phosphogypsum, and γ is the powder ratio in the curing agent.

[0076] The moisture content detector includes: an FDR sensor, a stainless steel probe, an integrated digital temperature sensor, a detector main control unit, and a detector communication unit; the FDR sensor is connected to the stainless steel probe, the integrated digital temperature sensor is connected to the stainless steel probe, and the detector main control unit is respectively connected to the FDR sensor, the integrated digital temperature sensor, and the detector communication unit;

[0077] The FDR sensor is used to determine the humidity of the phosphogypsum;

[0078] The stainless steel probe is used to conduct electromagnetic signals;

[0079] The integrated digital temperature sensor is used to detect the temperature of the phosphogypsum;

[0080] The detector main control unit is used to control the moisture content detector;

[0081] The detector communication unit is used to realize wireless communication of the moisture content detector.

[0082] In this embodiment, the stainless steel probe is a 15-cm four-pin stainless steel probe, and the integrated digital temperature sensor is an integrated DS18B20 digital temperature sensor.

[0083] The detector main control unit includes an ESP32-WROVER module, a low-power management circuit, namely a TPS63060 DC-DC converter, a lithium battery + a 6V / 5W solar panel.

[0084] The detector communication unit is a LoRA unlicensed band, SX1276 module. Among them, the LoRA unlicensed band can realize wireless communication without the support of an operator, and the SX1276 module is specifically set to the CN470 band with a transmission power of 20 dBm.

[0085] The multi-depth profile monitoring of the moisture content of phosphogypsum is realized through the moisture content detector.

[0086] The phosphogypsum conveyor belt scale 2 includes: a weighing sensor and a speed sensor; the weighing sensor and the speed sensor are respectively connected to the control module;

[0087] The weighing sensor is used to weigh the weight of the phosphogypsum on the phosphogypsum conveyor belt scale 2;

[0088] The speed sensor is used to weigh the conveying speed of the phosphogypsum conveyor belt scale 2.

[0089] The described anion polymer liquid conveying equipment includes: a flow meter and a flow velocity sensor; the flow meter and the flow velocity sensor are respectively connected to a control module;

[0090] The flow meter is used to measure the flow rate of the anion polymer liquid and calculate the liquid weight;

[0091] The flow velocity sensor is used to measure the flow velocity of the anion polymer liquid.

[0092] The powder conveyor 4 includes: a feed valve, a metering kettle, a weighing unit 6 and a discharge valve;

[0093] The feed valve is used to convey the powder from the powder bin 5 to the metering kettle;

[0094] The metering kettle is used to meter the powder;

[0095] The weighing unit 6 is used to weigh the powder weight in the metering kettle;

[0096] The discharge valve is used to convey the powder in the metering kettle to the mixer 3.

[0097] In this embodiment, the mixer 3 is a two-stage horizontal mixer. The two-stage mixer can achieve a more uniform mixing of phosphogypsum, powder and liquid polymer. It consists of two mutually reverse stirring shafts, the length of which is not less than 5 m, and the mixing capacity is about 200 t / h to 300 t / h. Through the circumferential, radial and axial forces of the blades, the materials are mixed, dispersed and kneaded, and finally uniform mixing is achieved.

[0098] In this embodiment, the spraying device includes a spray head, a pipeline, a pump and a spraying control unit. Among them, the spray head is used to spray the liquid into the mixing station, the pump is used to provide power for the liquid so that it can be conveyed to the spray head through the pipeline, and the spraying control unit is used to control the movement of the spraying device.

[0099] In this embodiment, the water content of the phosphogypsum raw material measured by the water content monitor is 12%. Finally, it is ensured that the water content of the harmlessly treated phosphogypsum is 20%, the mixing capacity of the mixer 3 is 200 t / h, the liquid ratio in the curing agent is set to 10%, and the powder agent ratio in the curing agent is set to 20%.

[0100] Then the control module calculates the required dosage of the anion polymer liquid and the spraying speed as: 200 t / h × (1 - 12%) × 10% = 17.6 t / h. The required powder dosage and the conveyor belt speed are: 200 t / h × (1 - 12%) × 20% = 35.2 t / h. According to the phosphogypsum conveyor belt of 200 t / h, in order to reach a water content of 20%, the required water spraying speed is: (20% - 12%) × 200 t / h + 35.2 t / h × 20% = 23.04 t / h. Then the water spraying speed of the spraying device is: 23.04 t / h.

[0101] The present invention can intelligently adjust and control the mixing ratio according to the initial water content of phosphogypsum, and output the dosages of powder materials, anionic polymer liquids and water; the powder materials, anionic polymer liquids and water diluents cooperate to achieve the harmless treatment of phosphogypsum; reduce the acidity of phosphogypsum, increase the pH value, reduce the water-soluble fluorine and total phosphorus contents, meet the industrial solid waste standard, and achieve the harmless treatment of 1 million tons of phosphogypsum per year. Among them, meeting the industrial solid waste standard means meeting the requirements of Class I general industrial solid waste specified in 《GB-18599》.

Claims

1. A harmless treatment system for phosphogypsum, characterized in that, Including: Phosphogypsum conveyor belt scale, moisture content detector, phosphogypsum storage bin, powder bin, powder conveyor, anionic polymer liquid bin, anionic polymer liquid conveying equipment, water distribution device, spraying device, mixer and control module; the control module is used to receive the data of the moisture content detector and control the conveying speed and conveying volume of the phosphogypsum conveyor belt scale, the flow rate of the anionic polymer liquid, the flow rate of the water distribution device and the conveying volume of the powder conveyor; The moisture content detector is installed in the phosphogypsum storage bin, the phosphogypsum storage bin is connected to the mixer through the phosphogypsum conveyor belt scale, the powder bin is connected to the mixer through the powder conveyor, the anionic polymer liquid bin is connected to the liquid conveying equipment, the anionic polymer liquid conveying equipment is connected to the water distribution device, the water distribution device is connected to the spraying device, the spraying device is installed in the mixer, the control module is respectively connected to the phosphogypsum conveyor belt scale, the powder conveyor and the anionic polymer liquid conveying equipment, and the moisture content detector and the control module are wirelessly communicatively connected.

2. The harmless treatment system for phosphogypsum as claimed in claim 1, wherein, Also including: Finished product conveyor belt and finished product receiving platform; the finished product receiving platform is connected to the mixer through the finished product conveyor belt.

3. The phosphogypsum harmless treatment system according to claim 1, characterized in that, The control module includes: a wireless communication unit, a belt scale control unit, an anionic polymer liquid flow rate control unit, a water distribution device control unit and a powder conveyor control unit; The wireless communication unit is used to receive the data of the moisture content detector and obtain the moisture content of the phosphogypsum; The belt scale control unit is used to adjust the conveying speed and conveying volume of the phosphogypsum conveyor belt scale according to the moisture content of the phosphogypsum; The anionic polymer liquid flow rate control unit is used to control the flow rate of the anionic polymer liquid according to the moisture content of the phosphogypsum; The water distribution device control unit is used to control the flow rate of the water distribution device according to the moisture content of the phosphogypsum; The powder conveyor control unit is used to control the conveying volume of the powder conveyor according to the moisture content of the phosphogypsum.

4. The phosphorus gypsum harmless treatment system according to claim 3, characterized in that, The expression for controlling the flow rate of the anionic polymer liquid according to the moisture content of the phosphogypsum is: β = (1 - α) × B × δ Where, β is the flow rate of the anionic polymer liquid, B is the mixing rate of the mixer, α is the moisture content of the phosphogypsum, and δ is the liquid ratio in the curing agent.

5. The phosphogypsum harmless treatment system according to claim 3, characterized in that, The expression for controlling the flow rate of the water distribution device according to the moisture content of the phosphogypsum is: η = (A - α) × B + B × (1 - α) × β × A Where, η is the flow rate of the water distribution device, B is the mixing rate of the mixer, α is the moisture content of the phosphogypsum, γ is the powder ratio in the curing agent, and A is the finished product moisture content.

6. The harmless treatment system for phosphogypsum according to claim 3, wherein The expression for controlling the conveying volume of the powder conveyor according to the moisture content of the phosphogypsum is: θ = (1 - α) × B × γ Where, θ is the conveying volume of the powder conveyor, B is the mixing rate of the mixer, α is the moisture content of the phosphogypsum, and γ is the powder ratio in the curing agent.

7. The phosphogypsum harmless treatment system according to claim 1, wherein, The moisture content detector includes: FDR sensor, stainless steel probe, integrated digital temperature sensor, detector main control unit and detector communication unit; the FDR sensor is connected to the stainless steel probe, the integrated digital temperature sensor is connected to the stainless steel probe, and the detector main control unit is respectively connected to the FDR sensor, the integrated digital temperature sensor and the detector communication unit; The FDR sensor is used to determine the humidity of phosphogypsum; The stainless-steel probe is used to conduct electromagnetic signals; The integrated digital temperature sensor is used to detect the temperature of phosphogypsum; The main control unit of the detector is used to control the moisture content detector; The communication unit of the detector is used to realize the wireless communication of the moisture content detector.

8. The phosphogypsum harmless treatment system according to claim 1, wherein, The phosphogypsum conveyor belt scale includes: a weighing sensor and a speed sensor; the weighing sensor and the speed sensor are respectively connected to the control module; The weighing sensor is used to weigh the weight of phosphogypsum on the phosphogypsum conveyor belt scale; The speed sensor is used to measure the conveying speed of the phosphogypsum conveyor belt scale.

9. The phosphogypsum harmless treatment system according to claim 1, wherein The anionic polymer liquid conveying equipment includes: a flow meter and a flow rate sensor; the flow meter and the flow rate sensor are respectively connected to the control module; The flow meter is used to measure the flow rate of the anionic polymer liquid and calculate the liquid weight; The flow rate sensor is used to measure the flow rate of the anionic polymer liquid.

10. The phosphorus gypsum harmless treatment system according to claim 1, characterized in that, The powder conveyor includes: a feed valve, a metering kettle, a weighing unit and a discharge valve; The feed valve is used to convey the powder in the powder silo to the metering kettle; The metering kettle is used to meter the powder; The weighing unit is used to weigh the powder weight in the metering kettle; The discharge valve is used to convey the powder in the metering kettle to the mixer.

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