Pickling production method of quartz sand

Abstract

The invention belongs to the technical field of quartz sand pickling processes, and particularly relates to a quartz sand pickling production method which comprises the following steps: constructing a plurality of pickling and washing production units; each pickling and washing production unit at least comprises a pickling barrel and a standby pickling barrel which are arranged at the upper part in parallel, two washing barrels arranged below the pickling barrel and the standby pickling barrel, a sand separation box arranged in the middle above the two washing barrels, and a sliding material conveying device arranged at the tops of the pickling barrel and the standby pickling barrel; a specifically used pickling and washing production unit is selected and prepared, and after feeding, pickling and acid filtering, the materials enter a washing barrel to be washed through a sand separation box. According to the quartz sand pickling production method, pickling and washing can be carried out at the same time, the working efficiency is improved, the labor cost is reduced, and each production unit is provided with the pickling barrel, the standby pickling barrel and the two washing barrels; no matter unexpected problems occur in the acid pickling process or the water washing process, only sand in a single barrel is affected, and the acid pickling process and the water washing process can still be normally operated.

Description

Technical Field

[0001] The invention belongs to the technical field of quartz sand pickling process, and particularly relates to a quartz sand pickling production method. Background Art

[0002] In the prior art, the quartz sand pickling and water washing processes are both carried out in one barrel. For example, the process disclosed in the Chinese utility model patent "CN217042780U A Pickling Device for Quartz Sand" is that after the quartz sand is pickled in the same device, the quartz sand is rinsed through the spray pipe in the barrel. In actual application, due to the complex impurity composition of quartz sand, HF or HCl must be used during pickling, the impurities of quartz sand contain a lot of Ca elements, and it is easy to harden and form a paste after pickling. The problem with the process of pickling first and then washing with water is that the process of filtering the acid solution is very time-consuming, and it is even more time-consuming if the acid is not filtered thoroughly and then rinsed directly.

[0003] Another process is to separate the pickling and water washing areas. For example, the device disclosed in the Chinese invention patent "CN105692629A-A method for rapid cleaning of pickled quartz sand" is to separate the water washing and pickling processes into several layers inside the same tank. In actual application, since the time taken for pickling and water washing is not equal, the utilization rate of the tank is low, and when the pickling process or the water washing process fails or the product quality is unqualified and needs to be inspected and verified, all materials in the tank must be scrapped and the tank cannot operate. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a quartz sand pickling production method in which pickling and water washing can be carried out simultaneously. Pickling and water washing are divided into two completely different barrels for processing, thereby improving work efficiency and reducing labor costs. Each production unit has a pickling barrel, a spare pickling barrel and two water washing barrels. No matter what unexpected problems occur in the pickling process or the water washing process, only the sand in a single barrel is affected, and the pickling and water washing processes can still operate normally; and a sliding material transport device can be used to conveniently and quickly select the specific pickling and water washing production unit to be used.

[0005] The specific technical solution adopted is: a quartz sand pickling production method, comprising the following steps:

[0006] Step 1. construct multiple pickling and water washing production units, each of which at least comprises a pickling barrel and a spare pickling barrel arranged in parallel on the top, two water washing barrels arranged below the pickling barrel and the spare pickling barrel, a sand dividing box arranged in the middle above the two water washing barrels, and a sliding material transport device arranged on the top of the pickling barrel and the spare pickling barrel; the sand dividing box has a sand inlet and two sand outlets that can be switched, the sand inlet of the sand dividing box is connected to the discharge port of the pickling barrel, and the sand outlets of the sand dividing box are respectively located at the top edges of the two water washing barrels; the top of the water washing barrel is open, and the bottom of the water washing barrel is provided with a plurality of water nozzles connected to the water inlet pipe, and the water nozzles are closed when no water is inlet;

[0007] Step 2. Select the pickling and water washing production unit to be used, and use the sliding material transport device to transport the quartz sand to be pickled to the inlet of the corresponding pickling barrel or the spare pickling barrel;

[0008] Step 3. Add acid solution for pickling. When the pickling barrel fails or the pickling process causes the quartz sand to be of unqualified quality, the newly prepared quartz sand to be pickled is transported to the spare pickling barrel for pickling; after the pickling is completed, filter the acid;

[0009] Step 4. The material obtained after acid filtration is acid-containing quartz sand or a paste formed by hardening after pickling. The material is passed through a sand separator into a water washing barrel below the pickling barrel. Water enters the barrel from the water nozzle at the bottom of the water washing barrel to wash the material in the barrel. When the water washing barrel fails or the washing process causes the quartz sand to be of unqualified quality, the next batch of materials is transported to another water washing barrel through the sand separator for washing.

[0010] Step 5. The washed sand is screened in a screening device or sent to a thickening bucket for further solid-liquid separation.

[0011] Moreover, the pickling barrel and the spare pickling barrel in step 1 have the same structure.

[0012] Moreover, the sliding material transport device in step 2 at least includes a transport track, a conveyor belt and a conveyor belt support frame. The transport track is arranged along the top of multiple pickling and water washing production units. The conveyor belt can move on the transport track through a pulley and slide rail structure. The conveyor belt can rotate in a cycle. A guide plate is provided under the front end of the conveyor belt to guide the quartz sand into the pickling barrel or the spare pickling barrel.

[0013] Moreover, a discharge port and an acid discharge port are provided at the bottom of the pickling barrel, a filter cloth is fixed in the pickling barrel, and the filter cloth is provided with a hole corresponding to the position and size of the discharge port of the pickling barrel. The acid that can pass through the material gap of the filter cloth in step 2 is discharged from the acid discharge port at the bottom of the pickling barrel, and the acid-containing quartz sand or the paste formed by compaction after pickling in step 3 directly enters the sand separation box from the hole in the filter cloth.

[0014] Moreover, in step 3, the water spouts are arranged at the bottom of the barrel body in the shape of several concentric circles as a whole, and the bottom of the washing barrel is provided with installation holes corresponding to the number and positions of the water spouts, and the number of installation holes is at least 100.

[0015] Moreover, in step 3, a circle of overflow grooves is provided on the top outer wall of the water washing bucket, and the top surface of the overflow grooves is slightly lower than the top surface of the water washing bucket.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Each pickling and water washing production unit of the present method at least includes a pickling barrel and a spare pickling barrel arranged in parallel on the top, two water washing barrels arranged below the pickling barrel and the spare pickling barrel, and a sand dividing box arranged in the middle above the two water washing barrels; the pickling barrel and the spare pickling barrel have the same structure, and the pickling barrel and the spare pickling barrel can pickle the two barrels of sand at the same time, or only one can pickle and the other can be used as a standby for emergency. The quartz sand after pickling directly enters the water washing barrel for water washing, so that the pickling and water washing processes do not affect each other.

[0018] 2. For quartz sand with high Ca content in impurities and easy to form paste after pickling, the leaching process of 4 hours of pickling process usually takes 8 hours (including acid filtration and leaching time), that is, the time for the pickling barrel to wait for the next batch of materials for pickling is twice the actual pickling time. The use of this method not only shortens the water washing process from 8 hours to only 2-3 hours, but also saves the waiting process for water washing due to the separation of the pickling barrel and the water washing barrel, and actually improves the working efficiency of the pickling barrel by three times. Since the industry is used to assign one employee to each pickling barrel to be responsible for guarding the operation, the number of employees required is reduced to one third of the original.

[0019] 3. A filter cloth is fixed in the pickling barrel. The material gap of the filter cloth can pass the acid but not the quartz sand, and is used for filtering the acid after pickling. Even if the impurities of the quartz sand contain a lot of Ca elements and are easy to form a paste after pickling, there is no need to filter the acid thoroughly. Since the filter cloth is provided with a hole corresponding to the position and size of the discharge port, the discharge port is opened to allow the quartz sand to form a paste after pickling directly from the hole of the filter cloth into the sand box and even the washing barrel. The time required for thorough acid filtering in the pickling barrel is saved, and the pickling barrel is kept in working condition as much as possible.

[0020] 4. The transport track of the sliding material transport device is set along the top of multiple production units. The conveyor belt can move on the transport track through the pulley slide rail structure. According to production needs, the conveyor belt is moved to the top of the pickling barrel or spare pickling barrel of the corresponding production unit to realize the feeding of the quartz sand to be pickled. This solves the problem of equipping each pickling tank with a loading device in the prior art.

[0021] 5. Improve the water inlet structure from top to bottom during the washing process to a water inlet structure from bottom to top, so as to improve the washing efficiency. By arranging a large number of water nozzles in the shape of several concentric circles at the bottom of the washing barrel, the water inlet is evenly distributed at the bottom of the barrel. The water nozzle structure and arrangement design of the washing barrel make the water flow and the natural gravity of the sand form a recoil, which is more conducive to evenly washing the quartz sand. At the same time, since the washing barrel does not directly enter the acid, compared with the existing technology of acid washing and water washing in one barrel at the same time, the washing barrel does not have a large amount of acid, so the top of the barrel can be set to open, and the quartz sand cleaning situation can be directly checked at any time during the washing process, and the water intake and washing time can be adjusted in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a pickling and washing production unit;

[0023] Figure 2 It is the overall flow chart of the production process;

[0024] Figure 3 It is a schematic diagram of the pickling barrel structure;

[0025] Figure 4 This is a schematic diagram of the filter cloth and discharge port structure in the pickling barrel;

[0026] Figure 5 This is a schematic diagram of the water washing barrel structure;

[0027] Figure 6 This is a schematic diagram of the bottom structure of the water washing barrel;

[0028] Figure 7 It is a schematic diagram of the structure of the sliding material transport device;

[0029] Description of reference numerals:

[0030] Acid washing barrel 1, spare acid washing barrel 2, water washing barrel 3, sand distribution box 4, sedimentation tank 5, acid preparation tank 6, feed port 7, inspection port 8, water inlet 9, acid inlet 10, exhaust port 11, discharge port 12, acid discharge port 13, spray pipe 14, alkaline water spray tower 15, filter cloth 16, hole 17, layering strip 18, pressure pipe 19, sand outlet 20, overflow trough 21, top of water washing barrel 22, water inlet pipe 23, solenoid valve 24, sand outlet 25, water nozzle 26, reinforcing rib or support column 27, overflow pipe 28, sand pump 29, water tank 30, transport track 31, pulley slide rail structure 32, conveyor belt 33, guide plate 34, conveyor belt support frame 35, sliding material transport device 36. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the accompanying drawings and embodiments, but the content of the present invention is not limited to the following embodiments.

[0032] A quartz sand pickling production method comprises the following steps:

[0033] Step 1. Build the pickling and washing production unit, such as Figure 1 As shown, each pickling and water washing production unit at least includes a pickling barrel 1 and a spare pickling barrel 2 arranged in parallel at the top, two water washing barrels 3 arranged below the pickling barrel and the spare pickling barrel, and a sand dividing box 4 arranged in the middle above the two water washing barrels; the sand dividing box has a sand inlet and two sand outlets 20 that can be switched, the sand inlet of the sand dividing box is connected to the discharge port 12 of the pickling barrel, and the sand outlets of the sand dividing box are respectively located at the top edges of the two water washing barrels; the top of the water washing barrel is open, and the bottom of the water washing barrel is provided with a plurality of water nozzles connected to the water inlet pipe, and the water nozzles are arranged at the bottom of the barrel body in a manner of forming a plurality of concentric circles as a whole, and the water nozzles are closed when no water is inletted; the bottom of the water washing barrel is provided with installation holes corresponding to the number and position of the water nozzles, and the number of the installation holes is at least 100; the top outer wall of the water washing barrel is provided with a circle of overflow grooves 21, and the top surface of the overflow grooves is slightly lower than the top surface of the water washing barrel;

[0034] Step 2. Select the pickling and water washing production unit to be used, and use the sliding material transport device to transport the quartz sand to be pickled to the corresponding pickling barrel or the feed inlet of the spare pickling barrel; the sliding material transport device at least includes a transport track, a conveyor belt and a conveyor belt support frame, the transport track is arranged along the top of the multiple pickling and water washing production units, the conveyor belt can move on the transport track through the pulley rail structure, the conveyor belt can circulate, and a guide plate is provided at the bottom of the front end of the conveyor belt to guide the quartz sand into the pickling barrel or the spare pickling barrel;

[0035] Step 3. Add hydrofluoric acid or hydrochloric acid for pickling; when the pickling barrel fails or the pickling process causes the quartz sand to be of unqualified quality, the newly prepared quartz sand to be pickled is transported to the spare pickling barrel for pickling; after the pickling is completed, the acid is filtered; a discharge port 12 and an acid discharge port 13 are provided at the bottom of the pickling barrel, and a filter cloth is fixed in the pickling barrel, and the filter cloth is provided with a hole corresponding to the position and size of the discharge port of the pickling barrel, and the acid that can pass through the material gap of the filter cloth is discharged from the acid discharge port at the bottom of the pickling barrel;

[0036] Step 4. The material obtained after acid filtration is acid-containing quartz sand or a paste formed by compaction after pickling. The material is directly fed into the discharge port through the hole of the filter cloth and then into a water washing barrel below the pickling barrel through a sand separator. Water enters the barrel from the water nozzle at the bottom of the water washing barrel to wash the material in the barrel. When the water washing barrel fails or the washing process causes the quartz sand to be of unqualified quality, the next batch of materials is transported to another water washing barrel through the sand separator for washing.

[0037] Step 5. The washed sand is screened in a screening device or sent to a thickening bucket for further solid-liquid separation.

[0038] The overall production process flow chart is as follows: Figure 2 As shown, the overall production line consists of multiple production units, each of which is Figure 1 The figure at least includes a pickling barrel 1 and a spare pickling barrel 2 arranged in parallel at the top, two water washing barrels 3 arranged below the pickling barrel and the spare pickling barrel, a sand dividing box 4, a sedimentation tank 5 connected to the bottom of the pickling barrel, and an acid preparation tank 6 connected to the sedimentation tank; the pickling barrel and the spare pickling barrel have the same structure, and the pickling barrel and the spare pickling barrel can pickle two barrels of sand respectively at the same time, or only one can pickle and the other can be used as a standby for emergency.

[0039] like Figure 3 As shown, the pickling barrel cover is provided with a feed port 7, an inspection port 8, a water inlet 9, an acid inlet 10 and an exhaust port 11. The feed port 7 of the pickling barrel is funnel-shaped and arranged at the center of the barrel cover. The pickling quartz sand enters the pickling barrel from the feed port. The bottom of the pickling barrel is provided with a discharge port 12 and an acid discharge port 13. The inspection port, the water inlet, the acid inlet and the exhaust port are arranged around the feed port. Figure 1 As shown, a spray pipe 14 connected to the water inlet is also provided inside the pickling barrel, and the spray pipe is connected to the water inlet, and the exhaust port is connected to the alkaline water spray tower 15 located outside the pickling barrel. In order to spray the acid and quartz sand remaining on the barrel wall, the spray pipe is an indispensable structure in the pickling barrel structure. Therefore, a water nozzle structure at the bottom of the water washing barrel similar to the present scheme will not be set in the pickling barrel, so the pickling barrel and the water washing barrel cannot replace each other.

[0040] like Figure 4 As shown, a filter cloth 16 is fixed in the pickling barrel, and the material gap of the filter cloth can pass acid but cannot pass quartz sand. The filter cloth is provided with a hole 17 corresponding to the position and size of the discharge port. The filter cloth near the inner wall of the pickling barrel is fixed by a layering strip 18 that is annular as a whole, and the hole of the filter cloth located at the discharge port is fixed by a pressure pipe 19 with a broken line shape in the longitudinal section. The material gap of the filter cloth fixed in the pickling barrel is 5 to 10 mm. The acid that can pass through the material gap of the filter cloth enters the bottom of the pickling barrel and is discharged from the acid discharge port 13. Because the impurities of quartz sand contain a lot of Ca elements and the quartz sand is hardened and paste-like after pickling, it does not need to be completely filtered, and directly enters the sand separation box 4 or even the water washing barrel from the hole 17 of the filter cloth. The time required for thorough acid filtering in the pickling barrel is saved, so that the pickling barrel is in working condition as much as possible.

[0041] like Figure 1 The sand dividing box 4 shown is arranged in the middle above the two water washing barrels 3. The sand dividing box has a sand inlet and two sand outlets 20 that can be switched. The switch of the sand outlet is a cover plate or a solenoid valve. The sand inlet of the sand dividing box is connected to the discharge port of the pickling barrel, and the sand outlet of the sand dividing box is respectively located at the top edges of the two water washing barrels.

[0042] Washing bucket Figure 5 and Figure 2As shown, the top 22 of the water washing bucket is open, and a circle of overflow grooves 21 are provided on the top outer wall of the water washing bucket. The top surface of the overflow groove is slightly lower than the top surface of the water washing bucket. The bottom of the water washing bucket is provided with a plurality of water nozzles connected to the water inlet pipe, and the water nozzles are connected to the water inlet pipe 23. The water inlet pipe is connected to the water tank 30. The water in the water inlet pipe enters the quartz sand water washing bucket through the water nozzles. The water inlet pipe is provided with a solenoid valve 24. The sand outlet 35 at the bottom of the water washing bucket is connected to the screening device through the sand pump 29 and the screening device, so that the washed sand enters the screening device for screening or is sent to the thickening bucket for further solid-liquid separation. Since the water washing bucket does not directly enter the acid, compared with the prior art of simultaneously performing acid washing and water washing in one bucket, the water washing bucket does not have a situation where there is a large amount of acid liquid, so the top of the barrel body can be set to be open, and the quartz sand cleaning situation can be directly checked at any time during the water washing process, and the water intake and water washing time can be adjusted in real time.

[0043] The overflow groove on the top outer wall of the washing bucket is annular, and the top surface of the overflow groove is 3 to 5 cm lower than the top surface of the bucket body, ensuring that the water entering the overflow groove will not flow back into the bucket body. When there is too much water in the bucket and it overflows from the top, the water will flow into the overflow groove, leaving time for the staff to close the water inlet pipe.

[0044] Figure 6 The bottom structure of the water washing bucket is shown as viewed from above. The water spout 26 cannot be actually seen from the upward angle. Its position is drawn in the figure to show its arrangement. The water spout is a rubber water spout, which is arranged at the bottom of the barrel in a shape of several concentric circles. When no water is in, the water spout is closed. The bottom of the water washing bucket is provided with installation holes corresponding to the number and position of the water spouts, and the installation holes are used to install the rubber water spouts. In order to strengthen the structural strength of the water washing bucket, a circle of reinforcing ribs or support columns 27 are provided at the bottom of the water washing bucket. The water discharged from the water washing bucket and the water overflowed from the overflow tank are transported to the acid-containing wastewater pool for centralized neutralization, recycling or treatment. In order to facilitate water filtration, the bottom of the water washing bucket can be designed with a double-layer structure of an upper sieve plate layer and a lower bottom plate layer. One end of the sand outlet of the water washing bucket is arranged on the upper sieve plate layer, and one end of the water outlet of the water washing bucket is arranged on the lower bottom plate layer. The water inlet pipe is arranged between the upper sieve plate layer and the lower bottom plate layer.

[0045] The sedimentation tank is connected to the acid discharge port at the bottom of the pickling barrel. The top of the sedimentation tank is provided with an overflow pipe 28 connected to the acid preparation tank for recovering and recycling the acid discharged from the pickling barrel.

[0046] Moreover, the pickling barrel has a double-layer structure, with an outer layer of iron and an inner layer of acid-resistant plastic. Because the strength of the acid-resistant plastic is insufficient, the outer layer needs to be covered with iron to increase the strength; the water washing barrel has a single-layer plastic structure, and the plastic strength of the water washing barrel is greater than the strength of the acid-resistant plastic in the inner layer of the pickling barrel. The plastic material for making the water washing barrel only needs to consider strength and has low requirements for acid resistance.

[0047] Moreover, in order to facilitate the operation and observation of employees, a first working platform and a second working platform need to be constructed. The first working platform is located on the top of the water washing barrel, and the second working platform is located on the top of the pickling barrel.

[0048] Figure 7 The figure shows a schematic diagram of the structure of a sliding material transport device. A sliding material transport device 36 including at least a transport track, a transport belt and a transport belt support frame is provided on the top of multiple production units. The transport track 31 is provided along the top of multiple production units and fixed on the second working platform. The transport belt can move on the transport track through a pulley rail structure 32. The transport belt 33 can circulate and rotate. A guide plate 34 is provided below the front end of the transport belt to guide the quartz sand into the pickling barrel or spare pickling barrel of the production unit. The motor driving the conveyor belt is fixed on the conveyor belt support frame 35 at the front end of the conveyor belt. The motor rotating shaft is connected to the conveyor belt 4 to provide power for the circulatory rotation of the conveyor belt.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] 1. Each pickling and water washing production unit of the present method at least includes a pickling barrel and a spare pickling barrel arranged in parallel on the top, two water washing barrels arranged below the pickling barrel and the spare pickling barrel, and a sand dividing box arranged in the middle above the two water washing barrels; the pickling barrel and the spare pickling barrel have the same structure, and the pickling barrel and the spare pickling barrel can pickle the two barrels of sand at the same time, or only one can pickle and the other can be used as a standby for emergency. The quartz sand after pickling directly enters the water washing barrel for water washing, so that the pickling and water washing processes do not affect each other.

[0051] 2. For quartz sand with high Ca content in impurities and easy to form paste after pickling, the leaching process of 4 hours of pickling process usually takes 8 hours (including acid filtration and leaching time), that is, the time for the pickling barrel to wait for the next batch of materials for pickling is twice the actual pickling time. The use of this method not only shortens the water washing process from 8 hours to only 2-3 hours, but also saves the waiting process for water washing due to the separation of the pickling barrel and the water washing barrel, and actually improves the working efficiency of the pickling barrel by three times. Since the industry is used to assign one employee to each pickling barrel to be responsible for guarding the operation, the number of employees required is reduced to one third of the original.

[0052] 3. A filter cloth is fixed in the pickling barrel. The material gap of the filter cloth can pass the acid but not the quartz sand, and is used for filtering the acid after pickling. Even if the impurities of the quartz sand contain a lot of Ca elements and are easy to form a paste after pickling, there is no need to filter the acid thoroughly. Since the filter cloth is provided with a hole corresponding to the position and size of the discharge port, the discharge port is opened to allow the quartz sand to form a paste after pickling directly from the hole of the filter cloth into the sand box and even the washing barrel. The time required for thorough acid filtering in the pickling barrel is saved, and the pickling barrel is kept in working condition as much as possible.

[0053] 4. The transport track of the sliding material transport device is set along the top of multiple production units. The conveyor belt can move on the transport track through the pulley slide rail structure. According to production needs, the conveyor belt is moved to the top of the pickling barrel or spare pickling barrel of the corresponding production unit to realize the feeding of the quartz sand to be pickled. This solves the problem of equipping each pickling tank with a loading device in the prior art.

[0054] 5. Improve the water inlet structure from top to bottom during the washing process to a water inlet structure from bottom to top, so as to improve the washing efficiency. By arranging a large number of water nozzles in the shape of several concentric circles at the bottom of the washing barrel, the water inlet is evenly distributed at the bottom of the barrel. The water nozzle structure and arrangement design of the washing barrel make the water flow and the natural gravity of the sand form a recoil, which is more conducive to evenly washing the quartz sand. At the same time, since the washing barrel does not directly enter the acid, compared with the existing technology of acid washing and water washing in one barrel at the same time, the washing barrel does not have a large amount of acid, so the top of the barrel can be set to open, and the quartz sand cleaning situation can be directly checked at any time during the washing process, and the water intake and washing time can be adjusted in real time.

Claims

1. A quartz sand pickling production method, characterized in that The steps include: Step 1. construct multiple pickling and water washing production units, each of which at least comprises a pickling barrel and a spare pickling barrel arranged in parallel on the top, two water washing barrels arranged below the pickling barrel and the spare pickling barrel, a sand dividing box arranged in the middle above the two water washing barrels, and a sliding material transport device arranged on the top of the pickling barrel and the spare pickling barrel; the sand dividing box has a sand inlet and two sand outlets that can be switched, the sand inlet of the sand dividing box is connected to the discharge port of the pickling barrel, and the sand outlets of the sand dividing box are respectively located at the top edges of the two water washing barrels; the top of the water washing barrel is open, and the bottom of the water washing barrel is provided with a plurality of water nozzles connected to the water inlet pipe, and the water nozzles are closed when no water is inlet; Step 2. Select the pickling and water washing production unit to be used, and use the sliding material transport device to transport the quartz sand to be pickled to the inlet of the corresponding pickling barrel or the spare pickling barrel; Step 3. Add acid solution for pickling. When the pickling barrel fails or the pickling process causes the quartz sand to be of unqualified quality, the newly prepared quartz sand to be pickled is transported to the spare pickling barrel for pickling; after the pickling is completed, filter the acid; Step 4. The material obtained after acid filtration is acid-containing quartz sand or a paste formed by hardening after pickling. The material is passed through a sand separator into a water washing barrel below the pickling barrel. Water enters the barrel from the water nozzle at the bottom of the water washing barrel to wash the material in the barrel. When the water washing barrel fails or the washing process causes the quartz sand to be of unqualified quality, the next batch of materials is transported to another water washing barrel through the sand separator for washing. Step 5. The washed sand is screened in a screening device or sent to a thickening bucket for further solid-liquid separation.

2. A quartz sand pickling production method according to claim 1, characterized in that: The pickling barrel and the spare pickling barrel in step 1 have the same structure.

3. A quartz sand pickling production method according to claim 1, characterized in that: In step 2, the sliding material transport device at least includes a transport track, a conveyor belt and a conveyor belt support frame. The transport track is arranged along the top of multiple pickling and water washing production units. The conveyor belt can move on the transport track through a pulley and slide rail structure. The conveyor belt can rotate in a cycle. A guide plate is provided under the front end of the conveyor belt to guide the quartz sand into the pickling barrel or the spare pickling barrel.

4. A quartz sand pickling production method according to claim 1, characterized in that: A discharge port and an acid discharge port are provided at the bottom of the pickling barrel. A filter cloth is fixed in the pickling barrel. The filter cloth is provided with a hole corresponding to the position and size of the discharge port of the pickling barrel. The acid that can pass through the material gap of the filter cloth in step 2 is discharged from the acid discharge port at the bottom of the pickling barrel. In step 3, the acid-containing quartz sand or the paste formed by compaction after pickling directly enters the sand separation box from the hole of the filter cloth.

5. A quartz sand pickling production method according to claim 1, characterized in that: In step 3, the water spouts are arranged at the bottom of the barrel body in the shape of several concentric circles as a whole. The bottom of the washing barrel is provided with installation holes corresponding to the number and positions of the water spouts, and the number of the installation holes is at least 100.

6. A quartz sand pickling production method according to claim 1, characterized in that: In step 3, a circle of overflow grooves is provided on the top outer wall of the water washing bucket, and the top surface of the overflow grooves is slightly lower than the top surface of the water washing bucket.

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