Precipitation separation equipment used after quartz sand pickling and quartz sand pickling recovery system

Abstract

The utility model relates to precipitation separation equipment used after quartz sand pickling and a quartz sand pickling recovery system. The precipitation separation equipment used after quartz sand pickling comprises a tank body, an acid discharging pipe assembly and a conical buffer assembly. The conical buffer cap mainly plays a role in dispersing the acid sand liquid falling from the central lower acid pipe and eliminating part of impact force of the acid sand liquid, so that liquid fluctuation in the tank body caused when the acid sand liquid enters the tank body is reduced, the precipitation separation effect of the acid sand liquid is improved, and the separation speed of the acid sand liquid is increased. Furthermore, acid gas is volatilized and acid mist is formed in the falling process of the acid sand liquid in the central acid discharging pipe due to temperature drop, and the acid gas and the acid mist are pumped out through the acid gas pumping port, so that the probability that the acid gas enters the tank body and impacts the liquid in the tank body can be reduced; and therefore, the phenomenon that the liquid in the tank body vibrates when the acid sand liquid enters the tank body is further reduced, the precipitation separation effect of the acid sand liquid is better, and the separation speed is higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to quartz sand treatment equipment technical field especially relates to a kind of for quartz sand acid washing after precipitation separation equipment and quartz sand acid washing recovery system. BACKGROUND

[0002] After traditional quartz sand acid washing procedure is completed, directly pour acid liquid to mortar pool and separate, then add new acid liquid and carry out acid washing, so that a large amount of acid liquid and heat are wasted, and a large amount of acid gas is generated in the process of acid liquid heat release, which will cause acid gas leakage and affect the environment if not recovered in time. SUMMARY

[0003] Therefore, it is necessary to provide a kind of precipitation separation equipment for quartz sand acid washing after acid sand liquid separation speed is fast, separation effect is good, and tail gas recovery can be effectively treated.

[0004] A kind of for quartz sand acid washing after precipitation separation equipment, comprising:

[0005] Tank body has opposite top end and bottom end;The top end is formed with acid inlet, acid gas extraction port and acid liquid discharge port;The bottom end is formed with sand outlet;

[0006] Lower acid pipe assembly, including center lower acid pipe and lateral acid inlet pipe;The center lower acid pipe is vertically arranged in the tank body, and one end is communicated with the acid gas extraction port, the other end is arranged towards the bottom end;The sidewall of the center lower acid pipe is provided with connecting hole;One end of the lateral acid inlet pipe is communicated with the acid inlet, and the other end is communicated with the connecting hole;

[0007] Conical buffer assembly, including support rod and conical buffer cap fixed to one end of the support rod;The end of the support rod away from the conical buffer cap is fixed to the inner wall of the bottom end;The tip of the conical buffer cap is towards the center lower acid pipe, and is spaced apart from the opening of the center lower acid pipe away from the top end;The orthographic projection of the opening of the center lower acid pipe away from the top end on the inner wall of the bottom end is located in the orthographic projection of the conical buffer cap on the inner wall of the bottom end.

[0008] A kind of quartz sand acid washing recovery system, characterized in that, as described above for quartz sand acid washing after precipitation separation equipment, acid washing tank, acid mist absorption tower and hot acid circulating tank;

[0009] The acid outlet of the acid washing pipe is communicated with the acid inlet;The gas inlet of the acid mist absorption tower is communicated with the acid gas extraction port;The liquid inlet of the hot acid circulating tank is communicated with the acid liquid discharge port.

[0010] The quartz sand acid washing recovery system uses the precipitation separation equipment for quartz sand after acid washing, and the acid sand liquid discharged from the acid washing tank enters the central lower acid pipe through the acid inlet and the lateral acid inlet pipe in sequence, and then flows out from the opening away from the top end of the central lower acid pipe and falls on the conical buffer cap to be precipitated and layered, the sand in the acid sand liquid is precipitated to the bottom of the tank body under the action of its own gravity, and the clean acid liquid after precipitation is located in the upper layer of the sand and can be discharged through the acid liquid discharge port. In this way, the conical buffer cap mainly plays a role of dispersing the acid sand liquid falling in the central lower acid pipe and eliminating the impact force of the acid sand liquid, so as to reduce the liquid disturbance in the tank body when the acid sand liquid enters the tank body, improve the precipitation separation effect and separation speed of the acid sand liquid. Further, the acid gas and acid mist are formed due to the temperature drop during the falling of the acid sand liquid in the central lower acid pipe, and the acid gas and acid mist are extracted through the acid gas extraction port, so as to reduce the probability of the acid gas entering the tank body to impact the liquid in the tank body, further reduce the liquid disturbance in the tank body when the acid sand liquid enters the tank body, so that the precipitation separation effect of the acid sand liquid is better and the separation speed is faster. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 Fig. 1 is a structural schematic view of a quartz sand acid washing recovery system according to an embodiment of the present application;

[0012] Figure 2 Fig. 2 is a structural schematic view of a precipitation separation equipment for quartz sand after acid washing in the quartz sand acid washing recovery system shown in Fig. 1. Figure 1

[0013] Label explanation: 10, quartz sand acid washing recovery system; 100, precipitation separation equipment for quartz sand after acid washing; 110, tank body; 111, top end; 1111, acid inlet; 1112, acid gas extraction port; 1113, acid liquid discharge port; 1114, acid liquid discharge port; 1115, maintenance opening; 112, bottom end; 1121, sand outlet; 1122, observation port; 113, top plate; 114, first side plate; 115, second side plate; 116, bottom plate; 117, acid overflow structure; 1171, sand overflow port; 120, lower acid pipe assembly; 121, central lower acid pipe; 1211, connecting hole; 1212, flared portion; 1213, air hole; 122, lateral acid inlet pipe; 130, conical buffer assembly; 131, support rod; 1311, fixed section; 1312, support section; 132, conical buffer cap; 140, breather valve; 150, flushing pipe; 151, connecting pipe section; 152, inclined pipe section; 160, liquid level meter; 170, sand outlet pipeline; 171, sand outlet pipe; 172, sand outlet main pipe; 200, acid washing tank; 300, acid mist absorption tower; 400, hot acid circulating tank; 500, sand discharge valve. DETAILED DESCRIPTION

[0014] ​For the purpose of facilitating the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present application will be more thorough and complete.

[0015] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein only for the purpose of describing the specific embodiments of the present application, and is not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0016] In describing a position relationship, unless otherwise specified, when an element is referred to as being "on" another element, it can be directly on the other element or there can be an intermediate element. It can also be understood that when an element is referred to as being "between" two elements, it can be the only one between the two elements, or there can be one or more intermediate elements.

[0017] In the case of using "including", "having", and "containing" described herein, unless using the explicit limiting term, such as "only", "consisting of", etc., another component can be added. Unless otherwise mentioned, the singular form of the term can include the plural form, and cannot be understood as the number of one.

[0018] In addition, the drawings are not drawn to scale 1:1, and the relative sizes of the elements are only drawn by example in the drawings, and are not necessarily drawn according to the true scale.

[0019] Please refer to Figure 1 The present application provides a kind of for quartz sand acid washing after precipitation separation equipment 100 and quartz sand acid washing recovery system 10. Among them, quartz sand acid washing recovery system 10 includes for quartz sand acid washing after precipitation separation equipment 100, acid washing tank 200, acid mist absorption tower 300 and hot acid circulating tank 400.

[0020] The precipitation separation device 100 for quartz sand after acid washing is connected with the acid washing tank 200, the acid mist absorption tower 300 and the hot acid circulating tank 400 respectively. In use, the acid washing tank 200 is used for acid washing treatment of quartz sand, and the precipitation separation device 100 for quartz sand after acid washing is used for precipitation separation of the acid sand liquid discharged from the acid washing tank 200, and the clean acid liquid after precipitation is recycled in the hot acid circulating tank 400 for reuse. In the process of the acid sand liquid entering the precipitation separation device 100 for quartz sand after acid washing, acid gas is volatilized and acid mist is formed, which is extracted and absorbed by the acid mist absorption tower 300 to reduce the pollution of the acid gas and the acid mist to the environment and the influence of the acid gas and the acid mist on the precipitation of the acid sand liquid.

[0021] Please refer to Figure 2 The precipitation separation device 100 for quartz sand after acid washing in the preferred embodiment of the utility model comprises a tank body 110, a lower acid pipe assembly 120 and a conical buffer assembly 130.

[0022] The tank body 110 has opposite top and bottom ends 111 and 112. The top end 111 is spaced apart to form an acid inlet 1111, an acid gas extraction port 1112 and an acid liquid discharge port 1113. The bottom end 112 is formed with a sand outlet 1121. When the precipitation separation device 100 for quartz sand after acid washing is located at a horizontal plane, the top and bottom ends 111 and 112 are the upper and lower ends of the tank body 110 respectively.

[0023] In the quartz sand acid washing recovery system 10, the acid outlet of the acid washing tank 200, the gas inlet of the acid mist absorption tower 300 and the liquid inlet of the hot acid circulating tank 400 are communicated with the acid inlet 1111, the acid gas extraction port 1112 and the acid liquid discharge port 1113 respectively to realize the connection between the acid washing tank 200, the acid mist absorption tower 300, the hot acid circulating tank 400 and the precipitation separation device 100 for quartz sand after acid washing.

[0024] The lower acid pipe assembly 120 comprises a central lower acid pipe 121 and a lateral acid inlet pipe 122. The central lower acid pipe 121 is vertically arranged in the tank body 110 and one end thereof is communicated with the acid gas extraction port 1112 and the other end thereof is arranged towards the bottom end 112. The side wall of the central lower acid pipe 121 is provided with a connecting hole 1211. One end of the lateral acid inlet pipe 122 is communicated with the acid inlet 1111 and the other end thereof is communicated with the connecting hole 1211.

[0025] The conical buffer assembly 130 includes a support rod 131 and a conical buffer cap 132 fixed to one end of the support rod 131. The end of the support rod 131 away from the conical buffer cap 132 is fixed to the inner wall of the bottom end 112. The tip of the conical buffer cap 132 faces the central lower acid pipe 121 and is spaced apart from the opening of the end of the central lower acid pipe 121 away from the top end 111. Therefore, the tip of the conical buffer cap 132 is arranged upward. The projection of the opening of the end of the central lower acid pipe 121 away from the top end 111 on the inner wall of the bottom end 112 is located within the projection of the conical buffer cap 132 on the inner wall of the bottom end 112. The support rod 131 can be a solid rod or a hollow structure (for example, a steel pipe, a cylinder structure, a shell structure, etc.).

[0026] For ease of understanding, the following describes the sedimentation separation process of the acid sand liquid in the quartz sand pickling recovery system 10 described above: The acid sand liquid discharged from the pickling tank 200 enters the central lower acid pipe 121 through the top acid inlet 1111 and the lateral acid inlet pipe 122 in sequence, and then flows out from the opening of the end of the central lower acid pipe 121 away from the top end 111 and falls on the conical buffer cap 132 for sedimentation and stratification; The sand in the acid sand liquid sediments to the bottom of the tank body 110 under the action of its own gravity; When the sand in the tank body 110 reaches a certain liquid level, it is discharged through the sand outlet 1121 for easy collection; The clear acid liquid obtained after sedimentation is located in the upper layer of the sand and is discharged through the acid liquid discharge port 1113 to the hot acid circulating tank 400 for storage for later reuse; The acid gas volatilized and the acid mist formed during the temperature drop of the acid sand liquid are extracted through the acid gas extraction port 1112 to the acid mist absorption tower 300 to reduce the amount of acid gas and acid mist entering the tank body 110.

[0027] In this way, the conical buffer cap 132 mainly plays a role in dispersing the acid sand liquid falling in the central lower acid pipe 121 and eliminating part of the impact force of the acid sand liquid, so as to reduce the liquid disturbance in the tank body 110 when the acid sand liquid enters the tank body 110, improve the sedimentation separation effect and speed of the acid sand liquid. Further, the acid gas volatilized and the acid mist formed during the falling process of the acid sand liquid in the central lower acid pipe 121 are extracted through the acid gas extraction port 1112, which can reduce the probability of the acid gas and acid mist entering the tank body 110 and causing impact on the liquid in the tank body 110, so as to further reduce the liquid disturbance in the tank body 110 when the acid sand liquid enters the tank body 110, so that the sedimentation separation effect of the acid sand liquid is better and the separation speed is faster.

[0028] In some embodiments, the end of the central lower acid pipe 121 away from the top end 111 is formed with a flared portion 1212 in the shape of a trumpet. The flared portion 1212 is located directly above the conical buffer cap 132. The projection of the flared portion 1212 on the inner wall of the bottom end 112 is located within the projection of the conical buffer cap 132 on the inner wall of the bottom end 112.

[0029] In this way, the acid sand liquid in the central lower acid pipe 121 is quickly dispersed by the flared portion 1212 and then falls on the conical buffer cap 132 to precipitate and separate, so as to further slow down the acid sand impact when the acid sand liquid enters the tank body 110, and further improve the precipitation and separation speed and effect of the acid sand liquid.

[0030] Specifically, the inner wall of the flared portion 1212 has the same inclination angle as the conical surface of the conical buffer cap 132. In this way, the impact of the acid sand liquid on the conical buffer cap 132 can be minimized, so as to further slow down the acid sand impact when the acid sand liquid enters the tank body 110, and make the liquid in the tank body 110 more stable, so as to further improve the precipitation and separation speed and effect of the acid sand liquid.

[0031] In some embodiments, the sidewall of the central lower acid pipe 121 is provided with a gas vent hole 1213. Specifically, the sidewall of both ends of the central lower acid pipe 121 is provided with a gas vent hole 1213. The gas vent hole 1213 is mainly used for pressure relief. In actual use, when the liquid level of the acid liquid reaches the medium or high liquid level, the gas vent hole 1213 on the central lower acid pipe 121 can be used for pressure relief, so as to solve the problem that the acid sand liquid cannot be added due to the high liquid level of the acid liquid.

[0032] In some embodiments, the top end 111 is provided with a pressure relief port (not labeled in the figure). The pressure relief port is provided with a breather valve 140. In the quartz sand acid washing and recovery system 10, the breather valve is in communication with the gas inlet of the acid mist absorption tower 300.

[0033] In actual application, when the amount of acid added suddenly increases and the pressure in the tank body 110 suddenly increases, the breather valve is opened to open the pressure relief port, so as to achieve rapid pressure relief, so that the acid gas in the tank body 110 is quickly discharged, and the gas discharged from the acid gas extraction port 1112 is processed in the acid mist absorption tower 300, improving the safety of the equipment, and ensuring that the tank body 110 can normally add acid to ensure the separation speed of the acid sand liquid.

[0034] In some embodiments, the support rod 131 includes a fixed segment 1311 and a support segment 1312. One end of the fixed segment 1311 is fixed to the inner wall of the bottom end 112, and the other end is detachably connected to one end of the support segment 1312. The end of the support segment 1312 away from the fixed segment 1311 is fixedly connected to the conical buffer cap 132. The support segment 1312 can be detachably connected by flange connection, threaded connection, etc.

[0035] In this way, the replacement of the conical buffer cap 132 can be achieved by disassembling and assembling the support segments 1312, thereby prolonging the service life of the precipitation separation device 100 used after the acid washing of quartz sand, and adjusting the height of the conical buffer cap 132 by selecting support segments 1312 of different lengths, thereby adapting to different specifications of the lower acid pipe assembly 120, so as to obtain different specifications of the precipitation separation device 100 used after the acid washing of quartz sand by selecting different lower acid pipe assemblies 120 and support segments 1312 and conical buffer caps 132, thereby reducing the processing cost of the device.

[0036] In some embodiments, the side wall of the bottom end 112 is formed with a flushing port (not labeled in the figure). The position of the flushing port is higher than the position of the sand outlet 1121. A flushing pipe 150 is arranged at the flushing port. One end of the flushing pipe 150 is located inside the tank body 110. The end of the flushing pipe 150 located inside the tank body 110 is open and faces the bottom end 112. After each sand discharge, the end of the flushing pipe 150 located outside the tank body 110 is connected to an external water source, and water is sprayed into the bottom of the tank body 110 through the flushing pipe 150 to acid wash the sand at the sand discharge port, effectively achieving automatic flushing of the sand in the tank body 110.

[0037] The external water source can be tap water or a flushing device that can provide pressurized water.

[0038] Further, in some embodiments, the tank body 110 includes a top plate 113, a first side plate 114 arranged along the circumference of the top plate 113 and connected to the top plate 113, a second side plate 115 connected to one end of the first side plate 114 and arranged along the circumference of the top plate 113, and a bottom plate 116 connected to one end of the second side plate 115 away from the first side plate 114. The top plate 113 is formed with an acid inlet 1111 and an acid gas outlet 1112. The first side plate 114 is formed with an acid liquid discharge port 1113. The bottom plate 116 is formed with a sand outlet 1121. The second side plate 115 is formed with a flushing port. The inner diameter of the second side plate 115 gradually decreases in the direction from the top plate 113 to the bottom plate 116. In this way, the bottom end 112 of the tank body 110 is a conical cylindrical structure to facilitate the accumulation and discharge of the precipitated sand at the bottom of the tank body 110.

[0039] The flushing pipe 150 includes a connecting pipe segment 151 passing through the flushing port and an inclined pipe segment 152 located inside the tank body 110 and connected to one end of the connecting pipe segment 151. The inclined pipe segment 152 is bent in the direction towards the bottom end 112 relative to the connecting pipe segment 151. The inclination angle of the inclined pipe segment 152 is consistent with the inclination angle of the second side plate 115.

[0040] In this way, the water used for flushing the sandstone flows through the connecting pipe section 151 and the inclined pipe section 152 in turn, and is sprayed in a direction consistent with the inclined direction of the second side plate 115, thereby flushing the sandstone on the bottom plate 116 towards the sand outlet 1121, and flushing the sandstone stagnating on the second side plate 115 towards the bottom plate 116, so as to effectively improve the sandstone flushing effect.

[0041] In some embodiments, the side wall of the bottom end 112 is provided with an observation opening 1122. The position height of the observation opening 1122 is higher than the position height of the sand outlet 1121. The observation opening 1122 is used to observe the discharge of the sandstone during the discharge of the sandstone through the sand outlet 1121.

[0042] Specifically, when the flushing opening is formed on the tank body 110, the position height of the observation opening 1122 is lower than the position height of the flushing opening, so as to observe the flushing condition after the sandstone is flushed.

[0043] In order to facilitate the maintenance of the structure in the tank body 110 by the staff, in some embodiments, the top end 111 is provided with a maintenance opening 1115.

[0044] In some embodiments, the sediment separation device 100 after the acid washing of the quartz sand further comprises a liquid level meter 160. The liquid level meter 160 is arranged on the top end 111. The liquid level meter 160 is mainly used to monitor the liquid level height of the liquid in the tank body 110, so as to facilitate the staff to understand the liquid level condition in the tank body 110, and improve the operation convenience.

[0045] Specifically, the liquid level meter 160 is a radar level meter, so as to reduce the influence of the acid gas in the tank body 110 on the liquid level detection, and improve the accuracy and reliability of the liquid level detection. Of course, in other embodiments, the liquid level meter 160 can also be other contact type liquid level meters.

[0046] In some embodiments, the sand outlet 1121 is a plurality of. The sediment separation device 100 after the acid washing of the quartz sand further comprises a sand outlet pipeline 170. The sand outlet pipeline 170 comprises a plurality of sand outlet sub-pipes 171 and a sand outlet main pipe 172 connected with one end of the plurality of sand outlet sub-pipes 171. The plurality of sand outlet sub-pipes 171 are in communication with the plurality of sand outlets 1121 respectively and correspondingly. The plurality of sand outlets 1121 and the sand outlet pipeline 170 can accelerate the discharge speed of the sedimented sandstone, so as to further improve the separation speed of the acid sand liquid.

[0047] Of course, the opening and closing of the sand discharge pipeline can be controlled by the opening and closing of the sand discharge valve 500 installed on the sand outlet main pipe 172 or other pipelines in communication with the sand outlet main pipe 172.

[0048] In some embodiments, the sidewall of the top end 111 is provided with an acid liquid discharge port 1114, and the acid liquid discharge port 1114 is provided with an acid overflow structure 117. The bottom of the acid overflow structure 117 is provided with a sand overflow port 1171. The sidewall of the acid overflow structure 117 is provided with an acid liquid discharge port 1113. The position of the acid liquid discharge port 1113 is higher than that of the sand overflow port 1171.

[0049] Therefore, when the clean acid liquid obtained after the acid sand liquid is precipitated is discharged into the hot acid circulating tank 400 through the acid liquid discharge port 1113, if a small amount of sand is contained in the clean acid liquid, the sand can continue to precipitate in the acid overflow structure 117 and be discharged through the sand overflow port 1171, so that the clean acid liquid with higher purity is obtained, and the separation effect of the acid sand liquid is further improved.

[0050] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not contradict, they should be considered as the scope of the present application.

[0051] The above-mentioned embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, however, it should not be understood as the limitation of the scope of the present application. It should be pointed out that, for ordinary skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A sedimentation separation device for quartz sand after acid washing, characterized by, The application relates to a tank body with a top end and a bottom end, wherein the top end is provided with an acid inlet, an acid gas outlet and an acid liquid outlet, and the bottom end is provided with a sand outlet; a lower acid pipe assembly is arranged in the tank body, and the lower acid pipe assembly comprises a central lower acid pipe and a lateral acid inlet pipe; the central lower acid pipe is arranged vertically in the tank body, one end of the central lower acid pipe is communicated with the acid gas outlet, and the other end of the central lower acid pipe is arranged towards the bottom end; a side wall of the central lower acid pipe is provided with a connecting hole; one end of the lateral acid inlet pipe is communicated with the acid inlet, and the other end of the lateral acid inlet pipe is communicated with the connecting hole; a conical buffer assembly is arranged in the tank body, and the conical buffer assembly comprises a supporting rod and a conical buffer cap fixed to one end of the supporting rod; one end of the supporting rod, which is away from the conical buffer cap, is fixed to an inner wall of the bottom end; a top point of the conical buffer cap is arranged towards the central lower acid pipe and is spaced from an opening of one end of the central lower acid pipe, which is away from the top end; a normal projection of the opening of one end of the central lower acid pipe, which is away from the top end, on the inner wall of the bottom end is located in a normal projection of the conical buffer cap on the inner wall of the bottom end. The opening of one end of the central lower acid pipe, which is away from the top end, is provided with a flared portion in the shape of a horn; the flared portion is located directly above the conical buffer cap; a normal projection of the flared portion on the inner wall of the bottom end is located in a normal projection of the conical buffer cap on the inner wall of the bottom end. An inner wall of the flared portion is inclined at an angle consistent with the angle of inclination of a conical surface of the conical buffer cap. The side wall of the central lower acid pipe is provided with a gas permeable hole; and / or 2. The apparatus for the sedimentation separation after the acid washing of quartz sand according to claim 1, characterized in that, The top end is provided with a pressure relief port; a breather valve is arranged at the pressure relief port; and / or 3. The apparatus for the sedimentation separation of quartz sand after acid washing according to claim 2, characterized in that, The supporting rod comprises a fixed section and a supporting section; one end of the fixed section is fixed to the inner wall of the bottom end, and the other end of the fixed section is detachably connected with one end of the supporting section; one end of the supporting section, which is away from the fixed section, is fixedly connected with the conical buffer cap.

4. The apparatus for the sedimentation separation after the acid washing of the quartz sand according to claim 1, characterized in that, The side wall of the bottom end is provided with a flushing port; a position height of the flushing port is higher than a position height of the sand outlet; a flushing pipe is arranged at the flushing port; one end of the flushing pipe is located in the tank body; the opening of one end of the flushing pipe, which is located in the tank body, is arranged towards the bottom end. The tank body comprises a top plate, a first side plate arranged along the circumference of the top plate and connected with the top plate, a second side plate connected with one end of the first side plate and arranged along the circumference of the top plate, and a bottom plate connected with one end of the second side plate, which is away from the first side plate; the top plate is provided with the acid inlet and the acid gas outlet; the first side plate is provided with the acid liquid outlet; the bottom plate is provided with the sand outlet; the second side plate is provided with the flushing port; an inner diameter of the second side plate gradually decreases along the direction of the top plate pointing to the bottom plate; The flushing pipe comprises a connecting pipe section penetrating through the flushing port and an inclined pipe section connected with one end of the connecting pipe section and located in the tank body; the inclined pipe section is bent in the direction of pointing to the bottom end relative to the connecting pipe section; an angle of inclination of the inclined pipe section is consistent with an angle of inclination of the second side plate.

5. The apparatus for the sedimentation separation after the acid washing of the quartz sand according to claim 1, characterized in that, The side wall of the bottom end is provided with an observation port; a position height of the observation port is higher than a position height of the sand outlet; and / or 6. The apparatus for the sedimentation separation of quartz sand after acid washing according to claim 5, characterized in that The top end is provided with an inspection port. ​ 7. The apparatus for the sedimentation separation after the acid washing of quartz sand according to claim 1, characterized in that, ​ ​ 8. The apparatus for the sedimentation separation after the acid washing of quartz sand according to claim 1, characterized by, Also comprising a liquid level meter; the liquid level meter is arranged on the top end; and / or The sand outlet is multiple; the precipitation separation equipment for quartz sand after acid washing further comprises a sand outlet pipeline; the sand outlet pipeline comprises multiple sand sub-pipes and a sand total pipe connected with one end of the multiple sand sub-pipes respectively; the multiple sand sub-pipes are communicated with the multiple sand outlets respectively and correspondingly at the ends far away from the sand total pipe.

9. The apparatus for the sedimentation separation after the acid washing of quartz sand according to claim 1, characterized in that, The sidewall of the top end is provided with an acid liquid discharge port, and the acid liquid discharge port is provided with an acid overflow structure; the bottom of the acid overflow structure is provided with a sandstone overflow port; the sidewall of the acid overflow structure is formed with the acid liquid discharge port; the position height of the acid liquid discharge port is higher than that of the sandstone overflow port.

10. A quartz sand acid wash recovery system characterized by, The precipitation separation equipment for quartz sand after acid washing, the acid washing tank, the acid mist absorption tower and the hot acid circulating tank according to any one of claims 1 to 9; The acid outlet of the acid washing pipeline is communicated with the acid inlet; the gas inlet of the acid mist absorption tower is communicated with the acid gas suction port; and the liquid inlet of the hot acid circulating tank is communicated with the acid liquid discharge port.

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