CN211035244U - Extract spent acid purification device - Google Patents
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- CN211035244U CN211035244U CN201922260299.5U CN201922260299U CN211035244U CN 211035244 U CN211035244 U CN 211035244U CN 201922260299 U CN201922260299 U CN 201922260299U CN 211035244 U CN211035244 U CN 211035244U
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Abstract
The utility model discloses an extraction spent acid purifier, including concentrated phosphoric acid clarification tank, reserve tank, one-level slurry mixing tank, second grade slurry mixing tank, one-level filter pressing device and second grade filter pressing device, extraction spent acid and the clarification tank slurry that the concentrated phosphoric acid clarification tank handled and obtain are carried to the reserve tank in and are mixed the back and carried one-level filter pressing device and carry out the filter-pressing and handle, the solid phase that one-level filter pressing device handled and obtain is carried to the one-level slurry mixing tank in and is carried out the thick liquid with water and become the thick liquid with water mixing slurry mixing and become the sediment thick liquid, and the sediment thick liquid that one-level slurry mixing tank was interior is carried to concentrated system, and the solid phase that second grade filter pressing device handled and obtains is carried to the sediment field with water mixing slurry mixing and is transferred to the sediment thick liquid. The utility model discloses separate effectually, effectually separate phosphoric acid recovery, impurity removal efficiency is high, improves resource utilization, and recovery efficiency is high, purifying effect is good, reduces emission pollution, retrieves and purifies with low costsly.
Description
Technical Field
The utility model relates to a high-purity phosphoric acid production technical field especially relates to an extract spent acid purifier.
Background
Phosphoric acid purification device adds phosphoric ore pulp and Na in pretreatment working section2S, the raw materials such as the raw materials carry out desulfurization and dearsenization treatment on the raw materials, and the raw materials are concentrated by a concentration system and then sent to a purification section; in the purification section, firstly, extracting by using an extracting agent, adding the extracting agent and a feed acid into an emulsion pump by using the extraction principle, separating and dissolving the mixture by using a phase separation tank, carrying out fine desulfurization on the obtained load solvent, washing the load solvent by using purified phosphoric acid in a washing tower to remove most of anions and cations in an organic phase, adding desalted water into a microreactor for back extraction to transfer the phosphoric acid from the organic phase into a water phase so as to obtain pure phosphoric acid, then sending the pure phosphoric acid into a post-treatment, and carrying out concentration, decoloration, final concentration, defluorination and bleaching treatment to obtain food-grade phosphoric acid, and obtaining the industrial-grade phosphoric acid only by concentration, decoloration, final concentration and bleaching treatment.
The raffinate acid is an inevitable byproduct of the solvent extraction method and has high P content2O5The concentration and high impurities (metal impurities such as iron, magnesium, calcium, aluminum and the like), and the raffinate acid still contains a large amount of useful resources and needs to be purified and recycled. Because the raffinate acid has multiple impurity types, high content of suspended solid and high viscosity, the prior raffinate acid purification device has low separation efficiency, is difficult to effectively remove impurities, influences the quality of the product produced by the recovered phosphoric acid, has low recovery rate, wastes more precious resources, has high production cost and serious discharge pollution.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve and the technical task that provides improve prior art, provide an extract spent acid purifier, solve the extract spent acid purifier separation efficiency among the prior art low, the rate of recovery is low, purifying effect is poor, the serious problem of wasting of resources.
For solving the above technical problem, the technical scheme of the utility model is that:
the utility model provides an extract spent acid purifier, includes concentrated phosphoric acid clarifier, reserve tank, one-level dressing trough, second grade dressing trough, one-level filter pressing device and second grade filter pressing device, the clarifier slurry that extract spent acid and concentrated phosphoric acid clarifier were handled and is obtained is carried to the reserve tank and mixes the back and is carried one-level filter pressing device to carry out filter pressing treatment, the solid phase that one-level filter pressing device handled and obtains is carried to one-level dressing trough in and is mixed the size with water and become the sediment thick liquid, and the sediment thick liquid in the one-level dressing trough is pumped to second grade filter pressing device and is carried out filter pressing treatment, and the liquid phase that second grade filter pressing device handled and obtains is carried to concentrated system, and the solid phase that second grade filter pressing device handled obtains is carried to second grade dressing trough in and is mixed the size with water and. Concentrated phosphoric acid that obtains through the processing of concentrated system gets into the concentrated phosphoric acid clarifier of phosphoric acid tank field, through natural settling, solid phase part deposit bottom, obtains the clarifier slurry through commentaries on classics harrow, slurry collector collection, extract spent acid purifier with extract spent acid and clarifier slurry mix earlier the back and carry out filter-pressing again and handle, the liquid phase filtration separation in extract spent acid and the clarifier slurry comes out, can retrieve and obtain the higher phosphoric acid of concentration to extract spent acid and clarifier slurry carry out the solid phase filter cake size mixing that the filter-pressing obtained and carry out filter-pressing again and handle, further recovery obtains diluted phosphoric acid, furthest will extract spent acid and clarifier slurry in the phosphoric acid separation rate, improve the resource recovery utilization ratio, improve economic benefits, effectively reduce and discharge the pollution, reduction in production cost.
Further, clarified acid obtained by treatment of the concentrated phosphoric acid clarifying tank is conveyed to a surface filter for filtration to obtain surface slag slurry and surface clarified acid, solid impurities are further removed, the surface clarified acid with lower solid content can be obtained, and the cleanliness of phosphoric acid is improved.
Furthermore, a plurality of surface filters are arranged in parallel, and the plurality of surface filters work in parallel, so that the treatment efficiency is high.
Furthermore, the clarified acid obtained by the treatment of the concentrated phosphoric acid clarifying tank is conveyed to the surface filter through a conveying pipe with a plurality of branch pipes, and the branch pipes are provided with on-off valves, so that the working condition of each surface filter can be independently controlled, the working quantity of the surface filters can be flexibly selected according to the change condition of the actual treatment capacity, the treatment efficiency is improved, and the production power consumption is reduced.
Further, the surface slurry obtained by the surface filter treatment is returned to the material preparation tank through a pipeline, phosphoric acid components with high concentration are remained in the surface slurry, and the surface slurry is returned to be mixed with raffinate acid and clarifying tank slurry and then is subjected to filter pressing together, so that the resource recycling rate is improved.
Further, the liquid phase obtained by the treatment of the second-stage filter pressing device is conveyed to a dilute acid tank for clarification treatment, clarified dilute acid obtained by the dilute acid tank is pumped to a concentration system, the liquid phase obtained by the treatment of the second-stage filter pressing device is coagulated to remove suspended impurities in the liquid, the treatment pressure of a subsequent surface filter is reduced, and the integral separation and recovery efficiency is improved.
Further, the dilute acid slurry obtained from the dilute acid tank is returned to the primary size mixing tank through a pipeline, a part of phosphoric acid components are remained in the dilute acid slurry, and the dilute acid slurry is subjected to filter pressing again, so that the resource recycling rate is improved.
Furthermore, stirring devices are arranged in the stock preparation tank, the primary size mixing tank and the secondary size mixing tank, so that the mixing sufficiency is improved, the subsequent equipment is convenient to treat, and the blockage in the conveying process is avoided.
Furthermore, the water conveying pipes for adding the water for size mixing with the temperature of more than or equal to 65 ℃ are arranged on the primary size mixing tank and the secondary size mixing tank, and water with higher temperature is adopted for size mixing, so that the filter cake can be quickly and fully dissolved into water, the uniformity of the slag slurry is ensured, and the blockage of a conveying pipeline caused by the filter cake with caking in the slag slurry is avoided.
Furthermore, the first-stage filter pressing device and the second-stage filter pressing device adopt plate-and-frame filter pressing devices, so that the solid-liquid separation efficiency is high, the filtration driving force is large, the solid content of a filter cake is high, the filtrate is clear, and the solid recovery rate is high
Compared with the prior art, the utility model discloses the advantage lies in:
extract spent acid purifier, solid-liquid separation is effectual, efficient, effectually retrieves phosphoric acid separation, impurity removal efficiency is high, improves resource utilization, recovery efficiency is high, purifying effect is good, reduces emission pollution, retrieves and purifies with low costs.
Drawings
FIG. 1 is a schematic view of an embodiment of a raffinate acid purification apparatus;
FIG. 2 is a schematic view of a second embodiment of a raffinate acid purification apparatus;
FIG. 3 is a schematic view of an embodiment of a raffinate acid purification apparatus;
FIG. 4 is a fourth schematic diagram of an embodiment of a raffinate acid purification apparatus.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment of the utility model discloses a raffinate acid purification device can effectively get rid of impurity, and solid-liquid separation is efficient, and purifying effect is good, effectively improves phosphoric acid recycle rate, improves resource utilization, reduces and discharges the pollution, retrieves and purifies with low costs.
Example one
As shown in fig. 1, a raffinate acid purification device mainly comprises a concentrated phosphoric acid clarifying tank 8, a stock tank 1, a primary slurry mixing tank 2, a secondary slurry mixing tank 3, a primary filter pressing device 4 and a secondary filter pressing device 5, wherein the primary filter pressing device 4 and the secondary filter pressing device 5 adopt plate-and-frame filter pressing devices, and stirring devices are arranged in the stock tank 1, the primary slurry mixing tank 2 and the secondary slurry mixing tank 3;
raw materials are added into a material preparation tank 1 to be mixed and then are pumped to a primary filter pressing device 4 through a pipeline to be filter-pressed, the raw materials mainly comprise raffinate acid and to-be-treated slag slurry, the to-be-treated slag slurry mainly comprises clarifying tank slurry obtained by treatment of a concentrated phosphoric acid clarifying tank 8 from a phosphoric acid tank area, concentrated phosphoric acid (with the solid content of about 3%) prepared by a concentration system enters the phosphoric acid tank area clarifying tank and naturally settles in the clarifying tank, the solid phase part deposits at the bottom and is collected by a rake and a slurry collector (with the solid content of 20% -25%) to obtain the clarifying tank slurry, and a stirring device in the material preparation tank 1 can fully mix the raffinate acid and the clarifying tank slurry, so that the filter pressing effect of the subsequent primary filter pressing device 4 is ensured, and the blockage of the raw materials when the raw materials are pumped to the primary filter pressing device 4 along the pipeline is avoided;
the first-stage filter pressing device 4 carries out filter pressing treatment and separation to obtain a liquid phase and a solid phase, wherein the liquid phase is a first-pressure acid with higher phosphoric acid concentration, the first-pressure acid is an acid solution with the phosphoric acid concentration of 46.5-51%, the first-pressure acid is directly conveyed to a phosphoric acid purifying device to be used as a raw material, and the solid phase is a first-pressure filter cake mainly composed of solid impurities; the method comprises the following steps that a press cake is conveyed into a primary size mixing tank 2, a water conveying pipe for adding size mixing water with the temperature being more than or equal to 65 ℃ is arranged on the primary size mixing tank 2, the press cake is fully dissolved into the water under the action of a stirring device in the primary size mixing tank 2 to form uniform primary slag slurry, caking in the primary slag slurry can be effectively avoided, the size mixing water adopts slag field backwater, water resources are fully utilized, the cost is reduced, the solid content of the primary slag slurry is controlled to reach 20-25%, the primary slag slurry can be smoothly conveyed to a secondary filter pressing device 5 through a pipeline for filter pressing treatment, and the secondary filter pressing device 5 can be guaranteed to efficiently carry out solid-liquid separation;
the secondary filter pressing device 5 carries out filter pressing treatment and separation to obtain a liquid phase and a solid phase, the liquid phase is secondary pressure acid with the phosphoric acid concentration of 19-24 percent, the solid phase is a secondary filter pressing cake mainly composed of solid impurities, the liquid phase obtained by the treatment of the secondary filter pressing device 5 is conveyed to a concentration system for concentration treatment to obtain concentrated phosphoric acid, the secondary filter pressing cake is conveyed to a secondary pulp regulating tank 3, a water conveying pipe for adding pulp regulating water with the temperature of more than or equal to 65 ℃ is arranged on the secondary pulp regulating tank 3, under the agitating unit effect in second grade size mixing groove 3, two press cake fully dissolve the aquatic and form even second grade sediment thick liquid, can effectively avoid having the caking to lead to the conveying pipeline to block up in the second grade sediment thick liquid, and the water of sizing mixing adopts the sediment field return water, make full use of water resource, reduce cost, and the solid content of control one-level sediment thick liquid reaches 10 ~ 15%, is convenient for with the smooth and easy pipeline pump sending to the sediment field that passes through of second grade sediment thick liquid.
Example two
As shown in fig. 2, a raffinate acid purification device mainly comprises a concentrated phosphoric acid clarifying tank 8, a stock tank 1, a primary slurry mixing tank 2, a secondary slurry mixing tank 3, a primary filter pressing device 4 and a secondary filter pressing device 5, wherein the primary filter pressing device 4 and the secondary filter pressing device 5 adopt plate-and-frame filter pressing devices, and stirring devices are arranged in the stock tank 1, the primary slurry mixing tank 2 and the secondary slurry mixing tank 3;
raw materials are added into a material preparation tank 1 to be mixed and then are pumped to a primary filter pressing device 4 through a pipeline to be filter-pressed, the raw materials mainly comprise raffinate acid and to-be-treated slag slurry, the to-be-treated slag slurry mainly comprises clarifying tank slurry obtained by treatment of a concentrated phosphoric acid clarifying tank 8 from a phosphoric acid tank area, concentrated phosphoric acid (with the solid content of about 3%) prepared by a concentration system enters the phosphoric acid tank area clarifying tank and naturally settles in the clarifying tank, the solid phase part deposits at the bottom and is collected by a rake and a slurry collector (with the solid content of 20% -25%) to obtain the clarifying tank slurry, and a stirring device in the material preparation tank 1 can fully mix the raffinate acid and the clarifying tank slurry, so that the filter pressing effect of the subsequent primary filter pressing device 4 is ensured, and the blockage of the raw materials when the raw materials are pumped to the primary filter pressing device 4 along the pipeline is avoided;
conveying clarified acid obtained by treatment of the concentrated phosphoric acid clarifying tank 8 to a surface filter for filtration treatment to obtain surface slag slurry and surface clarified acid, attaching solid particulate matters to the outer surface of a filter membrane of the surface filter, stripping the surface of the filter membrane through a 'back flushing' procedure, settling the solid particulate matters to the conical bottom of the surface filter, discharging solid impurities along with a small amount of phosphoric acid to form surface slag slurry through a 'slag discharge' procedure, wherein the surface clarified acid is acid liquor with the phosphoric acid concentration of 46.5-51%, and the surface clarified acid can be directly conveyed to a phosphoric acid purification device or a phosphoric acid diamine device to be used as a raw material;
the first-stage filter pressing device 4 carries out filter pressing treatment and separation to obtain a liquid phase and a solid phase, wherein the liquid phase is a first-pressure acid with higher phosphoric acid concentration, the first-pressure acid is an acid solution with the phosphoric acid concentration of 46.5-51%, the first-pressure acid is directly conveyed to a phosphoric acid purifying device to be used as a raw material, and the solid phase is a first-pressure filter cake mainly composed of solid impurities; the method comprises the following steps that a press cake is conveyed into a primary size mixing tank 2, a water conveying pipe for adding size mixing water with the temperature being more than or equal to 65 ℃ is arranged on the primary size mixing tank 2, the press cake is fully dissolved into the water under the action of a stirring device in the primary size mixing tank 2 to form uniform primary slag slurry, caking in the primary slag slurry can be effectively avoided, the size mixing water adopts slag field backwater, water resources are fully utilized, the cost is reduced, the solid content of the primary slag slurry is controlled to reach 20-25%, the primary slag slurry can be smoothly conveyed to a secondary filter pressing device 5 through a pipeline for filter pressing treatment, and the secondary filter pressing device 5 can be guaranteed to efficiently carry out solid-liquid separation;
the secondary filter pressing device 5 carries out filter pressing treatment and separation to obtain a liquid phase and a solid phase, the liquid phase is secondary pressure acid with the phosphoric acid concentration of 19-24 percent, the solid phase is a secondary filter pressing cake mainly composed of solid impurities, the liquid phase obtained by the treatment of the secondary filter pressing device 5 is conveyed to a concentration system for concentration treatment to obtain concentrated phosphoric acid, the secondary filter pressing cake is conveyed to a secondary pulp regulating tank 3, a water conveying pipe for adding pulp regulating water with the temperature of more than or equal to 65 ℃ is arranged on the secondary pulp regulating tank 3, under the agitating unit effect in second grade size mixing groove 3, two press cake fully dissolve the aquatic and form even second grade sediment thick liquid, can effectively avoid having the caking to lead to the conveying pipeline to block up in the second grade sediment thick liquid, and the water of sizing mixing adopts the sediment field return water, make full use of water resource, reduce cost, and the solid content of control one-level sediment thick liquid reaches 10 ~ 15%, is convenient for with the smooth and easy pipeline pump sending to the sediment field that passes through of second grade sediment thick liquid.
EXAMPLE III
As shown in fig. 3, a raffinate acid purification device mainly comprises a concentrated phosphoric acid clarifying tank 8, a stock tank 1, a primary slurry mixing tank 2, a secondary slurry mixing tank 3, a primary filter pressing device 4 and a secondary filter pressing device 5, wherein the primary filter pressing device 4 and the secondary filter pressing device 5 adopt plate-and-frame filter pressing devices, and stirring devices are arranged in the stock tank 1, the primary slurry mixing tank 2 and the secondary slurry mixing tank 3;
raw materials are added into a material preparation tank 1 to be mixed and then are pumped to a primary filter pressing device 4 through a pipeline to be filter-pressed, the raw materials mainly comprise raffinate acid and to-be-treated slag slurry, the to-be-treated slag slurry mainly comprises clarifying tank slurry obtained by treatment of a concentrated phosphoric acid clarifying tank 8 from a phosphoric acid tank area, concentrated phosphoric acid (with the solid content of about 3%) prepared by a concentration system enters the phosphoric acid tank area clarifying tank and naturally settles in the clarifying tank, the solid phase part deposits at the bottom and is collected by a rake and a slurry collector (with the solid content of 20% -25%) to obtain the clarifying tank slurry, and a stirring device in the material preparation tank 1 can fully mix the raffinate acid and the clarifying tank slurry, so that the filter pressing effect of the subsequent primary filter pressing device 4 is ensured, and the blockage of the raw materials when the raw materials are pumped to the primary filter pressing device 4 along the pipeline is avoided;
conveying clarified acid obtained by treatment of a concentrated phosphoric acid clarifying tank 8 to a surface filter 6 for filtration treatment to obtain surface slag slurry and surface clarified acid, attaching solid particulate matters to the outer surface of a filter membrane of the surface filter, stripping the surface of the filter membrane through a 'back flushing' procedure, settling the solid particulate matters to the conical bottom of the surface filter, discharging solid impurities along with a small amount of phosphoric acid to form surface slag slurry through a 'slag discharge' procedure, wherein the surface clarified acid is acid liquor with the phosphoric acid concentration of 46.5-51%, and the surface clarified acid can be directly conveyed to a phosphoric acid purification device or a phosphoric acid diamine device to be used as a raw material;
the surface filters 6 are connected in parallel, clarified acid obtained by treatment of the concentrated phosphoric acid clarifying tank 8 is conveyed to the surface filters 6 through conveying pipes branching a plurality of branch pipes, each branch pipe is provided with an on-off valve, the working condition of each surface filter can be independently controlled, the surface filters can be flexibly selected according to the change condition of actual treatment capacity, the treatment efficiency is improved, and meanwhile, the production power consumption is reduced;
the first-stage filter pressing device 4 carries out filter pressing treatment and separation to obtain a liquid phase and a solid phase, wherein the liquid phase is a first-pressure acid with higher phosphoric acid concentration, the first-pressure acid is an acid solution with the phosphoric acid concentration of 46.5-51%, the first-pressure acid is directly conveyed to a phosphoric acid purifying device to be used as a raw material, and the solid phase is a first-pressure filter cake mainly composed of solid impurities; the method comprises the following steps that a press cake is conveyed into a primary size mixing tank 2, a water conveying pipe for adding size mixing water with the temperature being more than or equal to 65 ℃ is arranged on the primary size mixing tank 2, the press cake is fully dissolved into the water under the action of a stirring device in the primary size mixing tank 2 to form uniform primary slag slurry, caking in the primary slag slurry can be effectively avoided, the size mixing water adopts slag field backwater, water resources are fully utilized, the cost is reduced, the solid content of the primary slag slurry is controlled to reach 20-25%, the primary slag slurry can be smoothly conveyed to a secondary filter pressing device 5 through a pipeline for filter pressing treatment, and the secondary filter pressing device 5 can be guaranteed to efficiently carry out solid-liquid separation;
the secondary filter pressing device 5 carries out filter pressing treatment and separation to obtain a liquid phase and a solid phase, the liquid phase is secondary pressure acid with the phosphoric acid concentration of 19-24 percent, the solid phase is a secondary filter pressing cake mainly composed of solid impurities, the liquid phase obtained by the treatment of the secondary filter pressing device 5 is conveyed to a concentration system for concentration treatment to obtain concentrated phosphoric acid, the secondary filter pressing cake is conveyed to a secondary pulp regulating tank 3, a water conveying pipe for adding pulp regulating water with the temperature of more than or equal to 65 ℃ is arranged on the secondary pulp regulating tank 3, under the agitating unit effect in second grade size mixing groove 3, two press cake fully dissolve the aquatic and form even second grade sediment thick liquid, can effectively avoid having the caking to lead to the conveying pipeline to block up in the second grade sediment thick liquid, and the water of sizing mixing adopts the sediment field return water, make full use of water resource, reduce cost, and the solid content of control one-level sediment thick liquid reaches 10 ~ 15%, is convenient for with the smooth and easy pipeline pump sending to the sediment field that passes through of second grade sediment thick liquid.
Example four
As shown in fig. 4, a raffinate acid purification device mainly comprises a concentrated phosphoric acid clarifying tank 8, a stock tank 1, a primary slurry mixing tank 2, a secondary slurry mixing tank 3, a primary filter pressing device 4 and a secondary filter pressing device 5, wherein the primary filter pressing device 4 and the secondary filter pressing device 5 adopt plate-and-frame filter pressing devices, and stirring devices are arranged in the stock tank 1, the primary slurry mixing tank 2 and the secondary slurry mixing tank 3;
raw materials are added into a material preparation tank 1 to be mixed and then are pumped to a primary filter pressing device 4 through a pipeline to be filter-pressed, the raw materials mainly comprise raffinate acid and to-be-treated slag slurry, the to-be-treated slag slurry mainly comprises clarifying tank slurry obtained by treatment of a concentrated phosphoric acid clarifying tank 8 from a phosphoric acid tank area, concentrated phosphoric acid (with the solid content of about 3%) prepared by a concentration system enters the phosphoric acid tank area clarifying tank and naturally settles in the clarifying tank, the solid phase part deposits at the bottom and is collected by a rake and a slurry collector (with the solid content of 20% -25%) to obtain the clarifying tank slurry, and a stirring device in the material preparation tank 1 can fully mix the raffinate acid and the clarifying tank slurry, so that the filter pressing effect of the subsequent primary filter pressing device 4 is ensured, and the blockage of the raw materials when the raw materials are pumped to the primary filter pressing device 4 along the pipeline is avoided;
conveying clarified acid obtained by treatment of a concentrated phosphoric acid clarifying tank 8 to a surface filter 6 for filtration treatment to obtain surface slag slurry and surface clarified acid, attaching solid particulate matters to the outer surface of a filter membrane of the surface filter, stripping the surface of the filter membrane through a 'back flushing' procedure, settling the solid particulate matters to the conical bottom of the surface filter, discharging solid impurities along with a small amount of phosphoric acid to form surface slag slurry through a 'slag discharge' procedure, wherein the surface clarified acid is acid liquor with the phosphoric acid concentration of 46.5-51%, and the surface clarified acid can be directly conveyed to a phosphoric acid purification device or a phosphoric acid diamine device to be used as a raw material;
the surface slurry obtained by the surface filter 6 is returned to the preparation tank 1 through a pipeline, because the surface slurry still contains phosphoric acid liquid components, the direct discharge wastes raw materials and causes environmental pollution, the surface slurry is returned to be mixed with raffinate acid and clarifying tank slurry to form raw materials, the surface slurry, the raffinate acid and the clarifying tank slurry are subjected to filter pressing treatment together, the recovery rate of phosphoric acid can be effectively improved, when the liquid level of the preparation tank rises to about 30 percent, a stirring device arranged in the preparation tank is started, the surface slurry, the clarifying tank slurry and the raffinate acid are uniformly mixed, and the liquid level of the preparation tank is controlled to be in a range of 15 to 90 percent;
the primary filter pressing device 4 is used for carrying out filter pressing treatment and separation to obtain a liquid phase and a solid phase, the liquid phase is a high-phosphoric-acid-concentration primary pressure cleaning acid, the primary pressure cleaning acid is an acid liquid with the phosphoric acid concentration of 46.5% -51%, the primary pressure cleaning acid is firstly pumped into the primary acid cleaning tank 7 for temporary storage, a stirring device is arranged in the primary acid cleaning tank, the primary pressure cleaning acid is directly conveyed from the primary acid cleaning tank 7 to a phosphoric acid purifying device for use as a raw material, and the solid phase is a primary pressure filter cake mainly composed of solid impurities; the method comprises the following steps that a press cake is conveyed into a primary size mixing tank 2, a water conveying pipe for adding size mixing water with the temperature being more than or equal to 65 ℃ is arranged on the primary size mixing tank 2, the press cake is fully dissolved into the water under the action of a stirring device in the primary size mixing tank 2 to form uniform primary slag slurry, caking in the primary slag slurry can be effectively avoided, the size mixing water adopts slag field backwater, water resources are fully utilized, the cost is reduced, the solid content of the primary slag slurry is controlled to reach 20-25%, the primary slag slurry can be smoothly conveyed to a secondary filter pressing device 5 through a pipeline for filter pressing treatment, and the secondary filter pressing device 5 can be guaranteed to efficiently carry out solid-liquid separation;
the secondary filter pressing device 5 performs filter pressing treatment to obtain a liquid phase and a solid phase, the liquid phase is secondary clear acid with the phosphoric acid concentration of 19-24%, the solid phase is secondary filter cake mainly composed of solid impurities, the secondary clear acid is firstly pumped into a secondary clear acid tank 9 for temporary storage, a stirring device is arranged in the secondary clear acid tank, the secondary clear acid is then conveyed from the secondary clear acid tank 9 to a dilute acid tank 10 for clarification treatment to obtain clarified dilute acid and dilute acid slurry, the dilute acid tank is also a concentrated phosphoric acid clarifying tank, the dilute acid slurry is pumped into a primary slurry mixing tank 2 through a pipeline, the dilute acid slurry is returned to be mixed with primary filter cake and water together to obtain primary filter pressing slurry, the slurry mixing ratio of the dilute acid slurry, the primary filter cake and the water is controlled, the solid content of the primary filter pressing slurry is controlled to be within the range of 20-25%, the primary filter pressing slurry is ensured to be smoothly pumped into the secondary filter pressing device 5 through the pipeline for treatment, the secondary filter pressing device 5 can be guaranteed to carry out solid-liquid separation efficiently, the clarified dilute acid is a dilute acid solution with the phosphoric acid concentration of 19% -24%, and the clarified dilute acid is conveyed to a concentration system for concentration treatment;
two press cakes are conveyed to a second-stage size mixing tank 3, a water conveying pipe for adding size mixing water with the temperature being more than or equal to 65 ℃ is arranged on the second-stage size mixing tank 3, the two press cakes are fully dissolved into the water and form uniform second-stage slag slurry under the action of a stirring device in the second-stage size mixing tank 3, the blockage of a conveying pipeline caused by caking in the second-stage slag slurry can be effectively avoided, the size mixing water adopts slag yard backwater, the water resource is fully utilized, the cost is reduced, the solid content of the first-stage slag slurry is controlled to reach 10-15%, and the second-stage slag slurry is conveniently and smoothly conveyed to a slag yard through a pipeline pump.
The raw material feeding pressure of the primary filter pressing device 4 and the secondary filter pressing device 5 is less than or equal to 0.8MPa, the material leakage phenomenon is avoided, the pressing pressure of the primary filter pressing device 4 and the secondary filter pressing device 5 is less than or equal to 1.4MPa, the solid-liquid separation efficiency is guaranteed, and the hydraulic cylinder pressing pressure of the primary filter pressing device 4 and the secondary filter pressing device 5 is less than 20 MPa.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.
Claims (10)
1. A raffinate acid purification device is characterized by comprising a concentrated phosphoric acid clarifying tank (8), a stock preparation tank (1), a primary size mixing tank (2), a secondary size mixing tank (3), a primary filter pressing device (4) and a secondary filter pressing device (5), wherein clarifying tank slurry obtained by treating the raffinate acid and the concentrated phosphoric acid clarifying tank (8) is conveyed to the stock preparation tank (1) to be mixed and then conveyed to the primary filter pressing device (4) for filter pressing treatment, the solid phase obtained by treatment of the primary filter pressing device (4) is conveyed to the primary slurry mixing tank (2) to be mixed with water and mixed with water to form slurry, the slurry in the primary slurry mixing tank (2) is pumped to the secondary filter pressing device (5) to be subjected to filter pressing treatment, the liquid phase obtained by treatment of the secondary filter pressing device (5) is conveyed to a concentration system, and the solid phase obtained by treatment of the secondary filter pressing device (5) is conveyed to the secondary slurry mixing tank (3) to be mixed with water and mixed with slurry to form slurry, and the slurry is conveyed to a slag field.
2. The raffinate acid purification apparatus according to claim 1, wherein the clarified acid obtained from the concentrated phosphoric acid clarifier (8) is delivered to a surface filter for filtration to obtain surface slurry and surface clarified acid.
3. The spent acid purification apparatus according to claim 2, wherein the surface filter (6) is provided in plurality in parallel.
4. The spent acid purification apparatus according to claim 3, wherein the clarified acid obtained from the concentrated phosphoric acid clarifier (8) is delivered to the surface filter (6) through a delivery pipe branching into a plurality of branch pipes, and the branch pipes are provided with on-off valves.
5. The raffinate purification apparatus according to claim 2, wherein the surface slurry obtained from the surface filter (6) is transported to the stock tank (1) through a pipeline.
6. The raffinate acid purification device according to any one of claims 1 to 5, wherein the liquid phase obtained by the secondary filter pressing device (5) is conveyed to a dilute acid tank (10) for clarification, and the clarified dilute acid obtained from the dilute acid tank (10) is conveyed to a concentration system.
7. The raffinate acid purification apparatus according to claim 6, wherein the dilute acid slurry obtained from the dilute acid tank (10) is returned to the primary size mixing tank (2) through a pipeline.
8. The raffinate acid purification apparatus according to any one of claims 1 to 5, wherein stirring devices are disposed in the stock tank (1), the primary slurry mixing tank (2) and the secondary slurry mixing tank (3).
9. The raffinate acid purification device according to any one of claims 1 to 5, wherein the primary slurry mixing tank (2) and the secondary slurry mixing tank (3) are provided with water pipes for adding slurry mixing water with the temperature of more than or equal to 65 ℃.
10. The raffinate acid purification device according to any one of claims 1 to 5, wherein the primary filter pressing device (4) and the secondary filter pressing device (5) adopt plate-and-frame filter pressing devices.
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| CN201922260299.5U CN211035244U (en) | 2019-12-16 | 2019-12-16 | Extract spent acid purification device |
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| CN (1) | CN211035244U (en) |
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2019
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