A production and preparation device for low-arsenic yellow phosphorus

Abstract

This utility model discloses a production and preparation device for low-arsenic yellow phosphorus, including a vessel body, a screening cylinder at the top of the vessel body, a feed inlet at the top of the screening cylinder, a liquid inlet on the top side wall of the vessel body, a stirring rod inserted at an angle into the inner cavity of the vessel body, inclined impeller blades on the side wall of the stirring rod, a drive motor connected to one end of the stirring rod extending out of the vessel body, a titanium alloy ultrasonic vibrating plate on the inner side wall of the vessel body, and a discharge port connected to the discharge port. This utility model utilizes the ultrasonic cavitation effect to break the surface coating of phosphate rock, releasing internal arsenic impurities. Oxidizing agents and other reagents are used to fully contact and react with the arsenic-containing phosphate rock, oxidizing elemental arsenic and sulfides into soluble substances, increasing the arsenic oxidation rate, and effectively reducing the arsenic content in the phosphate rock.

Description

Technical Field

[0001] This utility model relates to a production and preparation device for low-arsenic yellow phosphorus, belonging to the technical field of yellow phosphorus production equipment. Background Technology

[0002] In the production of yellow phosphorus, arsenic originates from the phosphate rock itself and exists as an impurity. During the electrothermal production process, arsenic is reduced and enters the yellow phosphorus product, affecting its purity. Therefore, effectively removing arsenic while minimizing the loss of yellow phosphorus is a key challenge in improving product quality and economic efficiency in the yellow phosphorus production process.

[0003] Traditional yellow phosphorus production feedstock pretreatment involves only simple crushing, screening, and flotation to remove impurities, but this method has a low arsenic removal rate and does not optimize the reducing activity of phosphate rock. This results in a large amount of arsenic being mixed into the yellow phosphorus during the electric furnace stage, requiring excessive coke to compensate for the low reactivity. In existing technologies, physical flotation cannot remove chemically bound arsenic, and the open processing flow is prone to arsenic dust pollution.

[0004] Therefore, to solve the above problems, we propose a production and preparation device for low-arsenic yellow phosphorus. Utility Model Content

[0005] The purpose of this invention is to provide a production and preparation device for low-arsenic yellow phosphorus, which achieves efficient arsenic removal in the pretreatment of yellow phosphorus raw materials, and is both economical and environmentally friendly, with a long service life and low maintenance costs.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a production and preparation device for low-arsenic yellow phosphorus, comprising a vessel body, a screening cylinder at the top of the vessel body, a feed inlet at the top of the screening cylinder, the feed inlet being fed through a closed conveying device such as a screw pusher and a closed conveyor belt, which can be directly connected to crushing equipment; a liquid inlet on the top side wall of the vessel body for convenient liquid material conveying; an inclined stirring rod inserted into the inner cavity of the vessel body, with inclined paddle stirring blades on the side wall of the stirring rod; a drive motor connected to one end of the stirring rod extending out of the vessel body; and a titanium alloy ultrasonic vibrating plate on the inner side wall of the vessel body, the titanium alloy ultrasonic vibrating plate having a frequency of 20-40kHz and a power density of 0.5W / cm³. 3 The vessel body is provided with a discharge port, and the discharge port is connected to a solid-liquid separator.

[0007] In the aforementioned low-arsenic yellow phosphorus production and preparation device, a material conveying device is provided on one side of the screening cylinder. A screening plate is inclinedly arranged in the inner cavity of the screening cylinder. The screening aperture of the screening plate is 10-50mm, so that the diameter of the phosphate rock particles is less than 50mm. The screening plate is located at the lower end near the conveying device and extends into its inner cavity. The material conveying device can be a spiral pusher, a closed conveyor belt, or other closed conveying equipment to transport the material back to the crushing equipment for re-crushing.

[0008] In the aforementioned low-arsenic yellow phosphorus production and preparation device, an air inlet is provided at the bottom of one side wall of the screening cylinder, and the air inlet is connected to a gas circulation pump through a pipe. An air outlet is provided at the top of the other side wall of the screening cylinder, and the air outlet is connected to a dust removal device through a pipe. The dust removal device is connected to the gas circulation pump to form a circulation loop to recover dust.

[0009] In the aforementioned low-arsenic yellow phosphorus production and preparation device, the dust removal equipment, gas circulation pump, and screening cylinder are connected to form a closed circulation loop, and the gas circulating in the closed circulation loop is nitrogen. Nitrogen is introduced into the screening cylinder to maintain a slight positive pressure, preventing arsenic dust from leaking out and oxidizing. The nitrogen circulation is formed by the gas circulation pump to recover dust and prevent arsenic-containing dust from escaping and polluting the environment.

[0010] The aforementioned low-arsenic yellow phosphorus production and preparation device has a stainless steel jacket on the outside of the vessel body. The stainless steel jacket has a water inlet and a water outlet on its two side walls, respectively, to maintain reaction stability and increase the reaction rate.

[0011] In the aforementioned low-arsenic yellow phosphorus production and preparation device, the stainless steel jacket is filled with circulating water and the temperature is controlled at 60-80℃.

[0012] The aforementioned low-arsenic yellow phosphorus production and preparation device has an anti-corrosion layer on the inner wall of the vessel.

[0013] In the aforementioned low-arsenic yellow phosphorus production and preparation device, the anti-corrosion layer is a polytetrafluoroethylene lining anti-corrosion layer, which is corrosion-resistant and improves service life.

[0014] In the aforementioned low-arsenic yellow phosphorus production and preparation device, the bottom of the inner cavity of the vessel body is a downward-concave arc shape, and the discharge port 8 is located at the lowest point of the arc shape to facilitate material discharge.

[0015] The aforementioned low-arsenic yellow phosphorus production and preparation apparatus includes a dust removal device comprising a cyclone separator and a bag filter.

[0016] Compared with existing technologies, this invention utilizes a titanium alloy ultrasonic vibrating plate to break the surface coating of phosphate rock through ultrasonic cavitation, releasing internal arsenic impurities. Oxidizing agents are then used to fully react with the arsenic-containing phosphate rock, oxidizing elemental arsenic and sulfides into soluble H3AsO4, increasing the oxidation rate to over 85%, effectively reducing the arsenic content in the phosphate rock. Furthermore, the combined use of a screening cylinder, agitator blades, and a stainless steel jacket for constant temperature control effectively improves the reaction rate, shortens the reaction time, and increases production efficiency. A closed-loop circulation system, connecting the dust removal equipment, gas circulation pump, and screening cylinder with circulating nitrogen, prevents arsenic dust leakage and oxidation, while simultaneously recovering dust to prevent the escape of arsenic-containing dust. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Reference numerals: 1-Bottle body, 2-Screening cylinder, 3-Feed inlet, 4-Liquid inlet, 5-Stirring rod, 6-Stirring blade, 7-Titanium alloy ultrasonic vibrating plate, 8-Discharge outlet, 9-Solid-liquid separator, 10-Material conveying device, 11-Screening plate, 12-Air inlet, 13-Gas circulation pump, 14-Air outlet, 15-Dust removal equipment, 16-Stainless steel jacket.

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0020] Embodiment 1 of this utility model: A production and preparation device for low-arsenic yellow phosphorus includes a vessel body 1. A screening cylinder 2 is provided at the top of the vessel body 1, and a feed inlet 3 is provided at the top of the screening cylinder 2. The feed inlet 3 is fed through a closed conveying device such as a screw pusher and a closed conveyor belt, which can be directly connected to a crushing device to transport the crushed phosphate rock into the vessel body 1. A liquid inlet 4 is provided on the top side wall of the vessel body 1 to facilitate the conveying of liquid materials, such as the oxidizing agent H2O2. A stirring rod 5 is inserted at an angle into the inner cavity of the vessel body 1. An inclined stirring blade 6 is provided on the side wall of the stirring rod 5 to generate axial force, achieve thorough liquid-solid mixing, and improve oxidation efficiency. One end of the stirring rod 5 extending out of the vessel body 1 is connected to a drive motor. The inclined arrangement of the stirring rod 5 makes the material circulation loop asymmetrical, which helps to improve the uniformity of material mixing. A titanium alloy ultrasonic vibrating plate 7 is provided on the inner side wall of the vessel body 1. The frequency of the titanium alloy ultrasonic vibrating plate 7 is 20-40kHz, and the power density is 0.5W / cm³. 3 The ultrasonic cavitation effect can break the coating layer on the surface of the phosphate rock and release the internal arsenic impurities. The part of the reactor body 1 is provided with a discharge port 8, which is connected to a solid-liquid separator 9 for separating the phosphate rock after arsenic removal treatment.

[0021] Embodiment 2 of this utility model: A production and preparation device for low-arsenic yellow phosphorus, comprising a vessel body 1, a screening cylinder 2 at the top of the vessel body 1, and a feed inlet 3 at the top of the screening cylinder 2. Feeding is achieved through a closed conveying device such as a screw conveyor or a sealed conveyor belt, which can be directly connected to crushing equipment to transport crushed phosphate rock into the vessel body 1. A liquid inlet 4 is provided on the top side wall of the vessel body 1 for convenient transport of liquid materials, such as the oxidizing agent H2O2. A stirring rod 5 is inclinedly inserted into the inner cavity of the vessel body 1, and inclined impeller blades 6 are provided on the side wall of the stirring rod 5, generating axial force to improve oxidation efficiency. A drive motor is connected to one end of the stirring rod 5 extending out of the vessel body 1. A titanium alloy ultrasonic vibrating plate 7 is provided on the inner side wall of the vessel body 1. The frequency of the titanium alloy ultrasonic vibrating plate 7 is 20-40kHz, and the power density is 0.5W / cm³. 3 The ultrasonic cavitation effect can break the coating layer on the surface of the phosphate rock and release the internal arsenic impurities. The part of the reactor body 1 is provided with a discharge port 8, which is connected to a solid-liquid separator 9 for separating the phosphate rock after arsenic removal treatment.

[0022] Specifically, a material conveying device 10 is provided on one side of the screening cylinder 2. A screening plate 11 is inclinedly arranged inside the screening cylinder 2. The screening aperture of the screening plate 11 is 10-50mm, so that the diameter of the phosphate rock particles is less than 50mm. The screening plate 11 is located at the lower end near the conveying device 10 and extends into its inner cavity. The material conveying device 10 can be a screw conveyor, a closed conveyor belt, or other closed conveying equipment to transport the material back to the crushing equipment for re-crushing. An air inlet 12 is provided at the bottom of one side wall of the screening cylinder 2. The air inlet 12 is connected to a gas circulation pump 13 through a pipe. An air outlet 14 is provided on the top of the other side wall. The air outlet 14 is connected to a dust removal device 15 through a pipe. The dust removal device 15 includes a cyclone separator and a bag filter. The dust removal device 15 is connected to a gas circulation pump 13 to form a circulation loop. Specifically, the dust removal device 15, the gas circulation pump 13 and the screening cylinder 2 are connected to form a closed circulation loop. The gas circulating in the closed circulation loop is nitrogen. Nitrogen is introduced into the screening cylinder 2 to maintain a slight positive pressure, prevent arsenic dust from leaking out and oxidizing, and form a nitrogen circulation through the gas circulation pump 13 to recover dust and prevent arsenic-containing dust from escaping and polluting the environment.

[0023] Embodiment 3 of this utility model: A production and preparation device for low-arsenic yellow phosphorus, comprising a vessel body 1, a screening cylinder 2 at the top of the vessel body 1, and a feed inlet 3 at the top of the screening cylinder 2. Feed is introduced through a closed conveying device such as a screw conveyor or a sealed conveyor belt, which can be directly connected to crushing equipment to transport crushed phosphate rock into the vessel body 1. A liquid inlet 4 is provided on the top side wall of the vessel body 1 for convenient conveying of liquid materials, such as the oxidizing agent H2O2. A stirring rod 5 is inclinedly inserted into the inner cavity of the vessel body 1, and inclined impeller blades 6 are provided on the side wall of the stirring rod 5, generating axial force to improve oxidation efficiency. A drive motor is connected to one end of the stirring rod 5 extending out of the vessel body 1. A titanium alloy ultrasonic vibrating plate 7 is provided on the inner side wall of the vessel body 1. The frequency of the titanium alloy ultrasonic vibrating plate 7 is 20-40kHz, and the power density is 0.5W / cm³. 3 The ultrasonic cavitation effect can break the coating layer on the surface of the phosphate rock and release the internal arsenic impurities. The part of the reactor body 1 is provided with a discharge port 8, which is connected to a solid-liquid separator 9 to separate the arsenic-removed phosphate rock. The solid-liquid separator 9 can be separated by equipment such as a centrifuge. The arsenic-containing liquid is discharged and then processed. The arsenic-removed phosphate rock solid is then used for the next step of production.

[0024] Specifically, a material conveying device 10 is provided on one side of the screening cylinder 2. A screening plate 11 is inclinedly arranged inside the screening cylinder 2. The screening aperture of the screening plate 11 is 10-50mm, so that the diameter of the phosphate rock particles is less than 50mm. The screening plate 11 is located at the lower end near the conveying device 10 and extends into its inner cavity. The material conveying device 10 can be a screw conveyor, a closed conveyor belt, or other closed conveying equipment to transport the material back to the crushing equipment for re-crushing. An air inlet 12 is provided at the bottom of one side wall of the screening cylinder 2. The air inlet 12 is connected to a gas circulation pump 13 through a pipe. An air outlet is provided at the top of the other side wall of the screening cylinder 2. The outlet 14 is connected to a dust removal device 15 via a pipe. The dust removal device 15 includes a cyclone separator and a bag filter. The dust removal device 15 is connected to a gas circulation pump 13 to form a circulation loop. Specifically, the dust removal device 15, the gas circulation pump 13, and the screening cylinder 2 are connected to form a closed circulation loop. The gas circulating in the closed circulation loop is nitrogen. Nitrogen is introduced into the screening cylinder 2 to maintain a slight positive pressure, preventing arsenic dust from leaking out and oxidizing. The gas circulation pump 13 forms a nitrogen circulation to recover dust and prevent arsenic-containing dust from escaping and polluting the environment. A nitrogen storage device can be installed between the dust removal device 15 and the gas circulation pump 13.

[0025] Specifically: A stainless steel jacket 16 is provided on the outer side of the vessel body 1. The two side walls of the stainless steel jacket 16 are respectively provided with a water inlet and a water outlet to maintain reaction stability and improve the reaction rate. Circulating water is circulated inside the stainless steel jacket 16 to control the temperature at 60-80℃. Meanwhile, an anti-corrosion layer is provided on the inner side wall of the vessel body 1. This anti-corrosion layer is a polytetrafluoroethylene (PTFE) lining, which is corrosion-resistant and improves service life. Furthermore, the bottom of the inner cavity of the vessel body 1 is a downward-concave arc shape, with the discharge port 8 located at the lowest point of the arc for easy discharge.

[0026] The working principle of one embodiment of this utility model is as follows: In use, this utility model employs a closed conveying device such as a spiral pusher and a sealed conveyor belt for feeding. It can be directly connected to the crushing equipment, conveying the crushed phosphate ore through the feed inlet 3 into the reactor body 1. The conveying route should be a closed space to prevent arsenic-containing dust from spilling out. Liquid materials such as the oxidizing agent H2O2 are conveyed into the reactor body 1 through the liquid inlet 4. The crushed phosphate ore first enters the screening cylinder 2 and is screened by the screening plate 11, allowing phosphate ore particles with a diameter less than 50mm to enter the inner cavity of the reactor body 1. Larger phosphate ore particles roll down to the material conveying device 10 and are transported back to the crushing equipment for re-crushing. Simultaneously, nitrogen gas is introduced into the closed circulation loop formed by the dust removal equipment 15, the gas circulation pump 13, and the screening cylinder 2, maintaining a slight positive pressure inside to prevent arsenic dust leakage and oxidation. Dust is recovered through the dust removal equipment 15 to prevent the escape of arsenic-containing dust and environmental pollution.

[0027] When the liquid materials such as the oxidizing agent H2O2 and the screened phosphate rock particles enter the inner cavity of the reactor body 1, the drive motor is started to drive the stirring rod 5 to drive the inclined blade stirring blade 6 to stir, so as to achieve full mixing of liquid and solid and improve oxidation efficiency. At the same time, the titanium alloy ultrasonic vibrating plate 7 is started. The ultrasonic cavitation effect can break the coating layer on the surface of the phosphate rock, release the internal arsenic impurities, and oxidize elemental arsenic and sulfides into soluble H3AsO4, increasing the oxidation rate to more than 85%, shortening the reaction time to 2 hours, increasing the arsenic removal rate from 40% to 85%, and reducing the amount of H2O2 used by 30%.

Claims

1. A production apparatus for low-arsenic yellow phosphorus, characterized in that, The vessel includes a vessel body (1), a sieve cylinder (2) at the top of the vessel body (1), a feed inlet (3) at the top of the sieve cylinder (2), a liquid inlet (4) on the top side wall of the vessel body (1), a stirring rod (5) inserted obliquely into the inner cavity of the vessel body (1), an inclined paddle stirring blade (6) on the side wall of the stirring rod (5), a drive motor connected to one end of the stirring rod (5) extending out of the vessel body (1), a titanium alloy ultrasonic vibrating plate (7) on the inner side wall of the vessel body (1), and a discharge port (8) at the bottom of the vessel body (1), which is connected to a solid-liquid separator (9).

2. The apparatus for producing low-arsenic yellow phosphorus according to claim 1, characterized in that, A material conveying device (10) is provided on one side of the screening cylinder (2), and a screening plate (11) is inclinedly provided in the inner cavity of the screening cylinder (2). The screening plate (11) is located at the lower end close to the conveying device (10) and extends into its inner cavity.

3. The apparatus for producing low-arsenic yellow phosphorus according to claim 2, characterized in that, An air inlet (12) is provided at the bottom of one side wall of the screening cylinder (2), and the air inlet (12) is connected to a gas circulation pump (13) through a pipe. An air outlet (14) is provided at the top of the other side wall of the screening cylinder (2), and the air outlet (14) is connected to a dust removal device (15) through a pipe. The dust removal device (15) and the gas circulation pump (13) are connected to form a circulation loop.

4. The apparatus for producing low-arsenic yellow phosphorus according to claim 3, characterized in that, The dust removal equipment (15), the gas circulation pump (13) and the screening cylinder (2) are connected to form a closed circulation loop, and the gas circulating in the closed circulation loop is nitrogen.

5. The apparatus for producing low-arsenic yellow phosphorus according to claim 1, characterized in that, The outer side of the vessel body (1) is provided with a stainless steel jacket (16), and the two side walls of the stainless steel jacket (16) are respectively provided with a water inlet and a water outlet.

6. The apparatus for producing low-arsenic yellow phosphorus according to claim 5, characterized in that, The stainless steel jacket (16) is filled with circulating water to control the temperature at 60-80℃.

7. The apparatus for producing low-arsenic yellow phosphorus according to claim 1, characterized in that, The inner wall of the vessel body (1) is provided with an anti-corrosion layer.

8. The apparatus for producing low-arsenic yellow phosphorus according to claim 7, characterized in that, The anti-corrosion layer is a polytetrafluoroethylene (PTFE) lining anti-corrosion layer.

9. The apparatus for producing low-arsenic yellow phosphorus according to claim 1, characterized in that, The bottom of the inner cavity of the vessel body (1) is a downward-concave arc shape, and the discharge port (8) is located at the lowest point of the arc.

10. A production apparatus for low-arsenic yellow phosphorus according to claim 3 or 4, characterized in that, The dust removal equipment (15) includes a cyclone separator and a bag filter.

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