Green and efficient sorting production system for ardealite

Abstract

The invention relates to a green and efficient phosphogypsum sorting production system which comprises a pulping barrel, a slurry pump, a sorting machine, a filtering machine and a filtrate pool. The sorting machine comprises an ore feeding groove, a washing water guide pipe, a spiral groove, a rack, a concentrate groove and a tailing groove. The method is beneficial to improving the quality of the phosphogypsum and realizing high-quality resource utilization of the phosphogypsum.

Description

Technical Field

[0001] The present invention relates to the field of phosphogypsum pretreatment, and particularly to the efficient separation of organic matter and silica impurities in phosphogypsum. Background Art

[0002] Phosphogypsum is a by-product of the wet-process phosphoric acid industry. Phosphogypsum contains impurities such as undecomposed phosphate rock, free phosphoric acid, silicon dioxide, and organic matter. Large amounts of stacking will cause environmental problems, polluting soil, atmosphere and water bodies. How to reasonably dispose of and treat it is an important problem it faces. Separating impurities in phosphogypsum is conducive to the resource utilization of phosphogypsum.

[0003] An organic matter separator is a separation process in which, according to the density or particle size differences between different material particles in minerals, under the action of gravity, medium dynamic force and mechanical force in a moving medium, the particle group produces loose stratification and migration separation, so as to obtain products with different densities or particle sizes.

[0004] The cross-sectional contour line of the spiral chute is a semi-ellipse. In addition to having a slope along the longitudinal direction (the direction of ore flow), the bottom of the chute also has a considerable inward inclination along the transverse direction (radial direction). After the pulp is fed from the upper part, the particle group is stratified during the flowing process. The light minerals located in the upper layer move downward along the outer side of the chute with the rotating pulp, and finally are discharged from the end of the chute, which is the tailings; the heavy mineral particles entering the bottom layer move inward along the transverse slope of the chute bottom, and the heavy mineral particles moving along the inner side of the chute have a lower speed and are discharged from the inner side of the end of the chute, which is the concentrate.

[0005] The silica separator is a vibrating screen, which separates according to the particle size of the material. Fine-grained materials pass through the screen surface, and coarse-grained materials remain on the screen surface and are discharged from the screen opening. The vibrating screen works by the reciprocating spiral vibration generated by the excitation of the vibrator. The upper rotating weight of the vibrator causes the screen surface to generate a planar gyratory vibration, while the lower rotating weight causes the screen surface to generate a conical gyratory vibration. The combined effect of them causes the screen surface to generate a complex spiral vibration. Its vibration trajectory is a complex space curve. The projection of this curve on the horizontal plane is a circle, and the projection on the vertical plane is an ellipse. By adjusting the excitation force of the upper and lower rotating weights, the amplitude can be changed. By adjusting the spatial phase angle of the upper and lower weights, the curve shape of the screen surface movement trajectory can be changed and the movement trajectory of the material on the screen surface can be changed. Vibration makes the material loose, and small-particle materials are easy to pass through the screen holes.

[0006] Wind power, photovoltaic power generation, and hydropower, i.e., green electricity, are renewable clean energies that ensure zero carbon emissions in the system's electricity consumption. Green electricity is stored using a sodium-ion battery system, which has the characteristics of low cost and stable electric energy. Photovoltaic power generation is located in photovoltaic power plants, wind power generation is located in wind farms, and hydropower is located in hydropower stations. The green electricity from different power plants and hydropower stations is connected to the sodium-ion battery energy storage system within the phosphogypsum enterprise through metal wires, and the sodium-ion battery energy storage system is connected to the electrical equipment of the production system through metal wires.

[0007] Currently, there is no production system that uses green electricity for efficient sorting of phosphogypsum. This system also has the characteristics of high production efficiency, low equipment investment, and less site usage. Summary of the Invention

[0008] To solve the problems existing in the prior art, the present invention provides a green and efficient sorting production system for phosphogypsum, which has high production efficiency and realizes carbon neutrality in the process of phosphogypsum sorting.

[0009] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0010] A green and efficient sorting production system for phosphogypsum includes a pulping tank, a slurry pump, an organic matter separator, a silica separator screen, a filter, and a filtrate tank; among them, the organic matter separator includes a feed tank, a flushing water conduit, a spiral trough, a frame, a concentrate tank, and a tailings tank.

[0011] The electric energy used by the system is one of photovoltaic power generation, wind power generation, and hydropower.

[0012] The filter is one of a plate-and-frame filter press and a vacuum filter.

[0013] The silica separator screen includes a vibrator, a screen box, a support device, and a transmission device.

[0014] The water circulation in the filtrate tank is used as the water for the pulping tank.

[0015] Compared with the prior art, the advantages of this patent are as follows:

[0016] The phosphogypsum sorting system uses green electricity as the electric energy and has the characteristics of being green and low-carbon.

[0017] The pulping tank is a cylindrical tank, and a stirring impeller is fixed on the top of the tank to mix the added phosphogypsum and water evenly.

[0018] A slurry pump, also known as a vortex pump, is a type of vane pump that relies on the force exerted by a rotating impeller on the liquid to impart an impulse to the liquid in the direction of its motion and transfer kinetic energy to achieve the conveyance of the liquid. It mainly consists of an impeller, a pump body, and a pump cover. The impeller is a disc, and the blades on the circumference are arranged radially and evenly. An annular flow channel is formed between the pump body and the impeller, and both the suction port and the discharge port are located at the outer circumference of the impeller; there is a partition between the suction port and the discharge port, which separates the suction port and the discharge port from each other.

[0019] The organic matter separator includes a feed trough, a flushing water conduit, a spiral trough, a frame, a concentrate trough, and a tailings trough, and is characterized by a simple structure, no moving parts, and low operating costs.

[0020] The silica separator screen is a commonly used industrial vibrating screen, which includes a vibrator, a screen box, a support device, and a transmission device. The screen box includes a screen frame and a screen surface, and the transmission device includes a motor and a coupling. The screen surface can be one of a stainless steel screen mesh, a stainless steel screen plate, or a nylon screen mesh, all of which can achieve the purpose; it is characterized by corrosion resistance, wear resistance, and a long service life. The stainless steel screen mesh is a mesh woven from stainless steel wires, the stainless steel screen plate is a screen plate made by punching holes in a stainless steel plate, and the nylon screen mesh is a mesh woven from nylon wires. The vibrating screen is directly driven by a coupling to maintain a stable rotation speed of the vibrator and has a long service life.

[0021] The filter is one of a plate and frame filter press or a vacuum filter, both of which can achieve the purpose, and the equipment is characterized by reliable operation.

[0022] The plate and frame filter press is the first machine applied to chemical dehydration. The plates and frames are arranged alternately, filter cloths are covered on both sides of the filter plates, and the plates and frames are tightened by a pressing device, thus forming a filter chamber between the plates and frames. Small holes are opened at the same middle position at the upper end of the plates and frames, and after tightening, they become a passage. The slurry pressurized to 0.2 - 0.4 MPa enters the filter chamber through this passage. The surface of the filter plate is engraved with grooves, and holes for discharging the filtrate are drilled at the lower end. The filtrate, under pressure, passes through the filter cloth and discharges from the filter machine along the grooves and holes, dehydrating the slurry.

[0023] The vacuum filter, also known as a vacuum filtration machine, is a device that realizes solid-liquid separation with a vacuum negative pressure as the driving force. Under the action of the vacuum negative pressure (0.04 - 0.07 MPa), the liquid in the slurry passes through the filter medium (filter cloth) and is drawn away, while the solid particles are intercepted by the medium, thus realizing the separation of the liquid and the solid.

[0024] The filtrate pool is a filtrate storage pool. The water in the filtrate pool is added to the pulping tank to prepare the slurry, realizing wastewater recycling and zero discharge.

[0025] In the patent system, the devices are connected by pipelines, and the slurry pump provides the driving force for the flow of the slurry and filtrate. The gypsum slurry is corrosive. For the devices used in this patent, the pipelines connecting the devices, and the pumps for transportation, the material in contact with the slurry is one of stainless steel, carbon steel with a plastic coating on the surface, and carbon steel with a cast stone coating on the surface, all of which can achieve the purpose; these materials have the characteristic of extending the service life of the devices. For carbon steel with a plastic coating on the surface, the plastic is one of nylon, polytetrafluoroethylene, and polyoxymethylene, all of which can achieve the purpose. For carbon steel with a cast stone coating on the surface, the cast stone is a material with regular crystal arrangement, hard texture, and fineness, which is made from steel slag and copper slag as raw materials through processes of batching, melting, casting, and heat treatment, and has the characteristics of wear resistance and long service life.

[0026] The purity of the phosphogypsum after separation by this separation system is ≥95%, which is beneficial to the resource utilization of gypsum. Brief Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present patent or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art; obviously, the drawings described below are only one embodiment recorded in this patent. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a schematic flow diagram of the green and efficient phosphogypsum separation production system provided by the embodiment of the present invention.

[0029] Figure 2 It is a schematic structural diagram of the organic matter separator provided by the embodiment of the present invention.

[0030] Figure 3 It is a schematic structural diagram of the silica separation sieve provided by the embodiment of the present invention.

[0031] Reference Numerals:

[0032] 1 - Pulping tank; 2 - Slurry pump; 3 - Organic matter separator; 4 - Filter, 4.1 - Organic matter filter, 4.2 - Concentrate filter, 4.3 - Silica filter; 5 - Silica separation sieve; 6 - Filtrate tank; 7 - Filtrate pump; 11 - Phosphogypsum; 12 - Organic matter tailing slurry; 13 - Middlings slurry; 14 - Organic matter tailings; 15 - Concentrate; 16 - Silica tailings;

[0033] 21 - Flushing water conduit; 22 - Feed trough; 23 - Spiral trough; 24 - Frame; 25 - Middlings trough; 26 - Organic matter tailings trough;

[0034] 31 - Screen surface; 32 - Screen box; 33 - Vibrator; 34 - Transmission device; 35 - Support device. Detailed Embodiments

[0035] To enable those skilled in the art to better understand this patent, the following further describes this patent in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only one embodiment of this patent, rather than all embodiments. Without conflict, the embodiments in this patent and the features in the embodiments can be combined with each other.

[0036] See Figure 1 , an efficient green sorting production system for phosphogypsum in an embodiment of this patent includes a pulping tank 1, a slurry pump 2, an organic matter separator 3, a filter 4, a silica sorting screen 5, and a filtrate tank 6; among them, the organic matter separator 3 includes a feed tank 21, a flushing water conduit 22, a spiral tank 23, a frame 24, a concentrate tank 25, and a tailings tank 26; the silica sorting screen 5 includes a screen surface 31, a screen box 32, a vibrator 33, a transmission device 34, and a support device 35. It is characterized in that the phosphogypsum 11 is added from the top of the pulping tank 1, the bottom of the pulping tank 1 is connected to the slurry pump 2, the slurry pump 2 is connected to the organic matter separator 3, the organic matter tailings slurry 12 separated by the organic matter separator 3 enters the organic matter filter 4.1 to obtain organic matter tailings 14, and the filtrate enters the filtrate tank 6; the middle slurry 13 separated by the separator 3 enters the silica sorting screen 5, the concentrate passes through the concentrate filter 4.2 to obtain concentrate 15, and the filtrate enters the filtrate tank 6; the tailings pass through the silica filter 4.3 to obtain silica tailings 16, and the filtrate enters the filtrate tank 6; the filtrate enters the pulping tank 1 through the filtrate pump 7 for recycling. The flow direction of the filtrate in the figure is indicated by a dashed line; the material flow direction is indicated by a solid line; the connection between devices is connected by a pipeline.

[0037] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A green and efficient sorting production system for phosphogypsum, comprising a pulping tank, a slurry pump, an organic matter separator, a silica separator screen, a filter, and a filtrate tank; wherein, The organic matter separator includes a feed trough, a flushing water conduit, a spiral trough, a frame, a concentrate trough, and a tailings trough.

2. The green and efficient separation production system for phosphogypsum according to claim 1, characterized in that The electric energy used by the system is one of photovoltaic power generation, wind power generation, and hydropower.

3. The green and efficient sorting and production system for phosphogypsum according to claim 1, characterized in that The filter is one of a plate and frame filter press and a vacuum filter.

4. A green and efficient separation production system for phosphogypsum according to claim 1, characterized in that, The silica separator screen includes a vibrator, a screen box, a support device, and a transmission device.

5. A green and efficient phosphogypsum sorting production system according to claim 1, characterized in that, The water circulation in the filtrate pond is used as water for the beating vat.

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