Quartz sand production line and production method

Abstract

The invention discloses a quartz sand production line and a production method, comprising a ore washing and sorting system, a storage system, a sand making system and a water circulation system; the sand making system comprises a fine crushing line, a screening mechanism, a secondary processing line and a drying line, the fine crushing line is connected to the ore washing and sorting system, the screening mechanism is provided with a finished product discharge port and a defective product discharge port, the defective product discharge port is connected to the input end of the secondary processing line, and the secondary processing line and the finished product discharge port are both connected to the input end of the drying line; the water circulation system comprises an acid supply device, a regulating tank and a muddy water treatment unit, the acid supply device is connected to the ore washing and sorting system; the input end of the muddy water treatment unit is connected to the regulating tank, and the muddy water treatment unit supplies purified waste water to the pickling line, the flushing and sorting line and the secondary processing line through a pipeline; the quartz sand production line and the production method can recycle defective minerals and waste water in the quartz sand production process, thereby reducing the production cost.

Description

Technical Field

[0001] The invention relates to the technical field of quartz sand production, and in particular to a quartz sand production line and a production method. Background Art

[0002] At present, quartz sand is quartz particles made by crushing quartz stone. Quartz stone is a non-metallic mineral, a hard, wear-resistant, chemically stable silicate mineral. The color of quartz sand is milky white or colorless and translucent, with a Mohs hardness of 7. Quartz sand is an important industrial mineral raw material, non-chemical hazardous goods, widely used in glass, casting, ceramics and fireproof materials, smelting ferrosilicon, metallurgical flux, metallurgy, construction, chemical industry, plastics, rubber, abrasives, filter materials and other industries.

[0003] At present, the production of quartz sand is basically to obtain quartz ore through sorting and washing, acid leaching, cleaning and drying, baking, magnetic separation and other processes. The current quartz sand production line is relatively simple. Although continuous assembly line production can be achieved during the production process, a large amount of clean water is required in the processes of sorting and washing, acid leaching, cleaning and drying. A large amount of defective minerals will be produced during the process of sorting and washing, crushing and screening. If these waste products are not handled properly, they are easy to pollute the environment. In particular, the defective minerals still contain a considerable amount of quartz particles, and the current quartz sand production line does not recycle and reuse these defective minerals and wastewater, which makes the production cost of the current quartz sand production line high. Summary of the invention

[0004] The present invention aims to solve at least one of the above-mentioned technical problems and provide a quartz sand production line and a production method, which can effectively recycle defective minerals and wastewater in the quartz sand production process and reduce production costs.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A quartz sand production line, comprising:

[0007] The ore washing and sorting system includes a multi-stage crushing line, a washing and sorting line and a pickling line connected in sequence;

[0008] The sand making system comprises a fine crushing line, a screening mechanism, a secondary processing line and a drying line, wherein the input end of the fine crushing line is connected to the output end of the pickling line, the screening mechanism is used to receive the material output by the fine crushing line and grade and screen the material, the screening mechanism is provided with a finished product discharge port and a defective product discharge port, the defective product discharge port is connected to the input end of the secondary processing line, and the output end of the secondary processing line and the finished product discharge port are both connected to the input end of the drying line;

[0009] A water circulation system, comprising an acid supply device, a regulating tank and a muddy water treatment unit, wherein the output end of the acid supply device is connected to the pickling line, the acid supply device is used to heat and supply cleaning acid to the pickling line, the regulating tank is used to receive wastewater discharged from the pickling line, the flushing and sorting line and the secondary treatment line, and the regulating tank is provided with a regulating component for adjusting the pH value of the wastewater; the input end of the muddy water treatment unit is connected to the regulating tank, and the output end of the muddy water treatment unit supplies purified wastewater to the pickling line, the flushing and sorting line and the secondary treatment line through a pipeline; and

[0010] The storage system is used to receive the finished quartz sand output by the drying line.

[0011] As an improvement of the above technical solution, the secondary processing line includes a pickling mechanism, a magnetic separator and a dewatering screen which are arranged in sequence; the pickling mechanism is connected to the output end of the defective material discharge port and is used to pickle the defective materials output by the defective material discharge port, the input end of the magnetic separator is connected to the output end of the pickling mechanism, and the output end of the magnetic separator is connected to the input end of the drying line through the dewatering screen; the wastewater discharged by the dewatering screen and the pickling mechanism is connected to the regulating tank through a pipeline, and the output end of the mud and water treatment unit supplies purified wastewater to the dewatering screen and the pickling mechanism through a pipeline.

[0012] As an improvement of the above technical solution, the pickling mechanism includes a temporary storage bucket, a material bag, a second pickling tank and a gantry hanger. The feed end of the temporary storage bucket is connected to the defective product discharge port. Tracks are provided on the opposite sides of the second pickling tank. The gantry hanger can be slidably installed on the track. The gantry hanger is used to hook the material bag and reciprocate between the temporary storage bucket, the second pickling tank and the input end of the magnetic separator; the second pickling tank is connected to the regulating tank through a pipeline.

[0013] As an improvement of the above technical solution, the screening mechanism includes a screening tank, a feed port is provided on the top of the screening tank, a first sieve plate and a second sieve plate are provided in sequence from top to bottom in the screening tank, the first sieve plate and the second sieve plate are both obliquely arranged in the screening tank, the top ends of the first sieve plate and the second sieve plate are both connected to high-frequency vibrators, the screening tank is provided with the finished product discharge port on the bottom end side walls of the first sieve plate and the second sieve plate; the defective product discharge port is arranged at the bottom of the screening tank.

[0014] As an improvement of the above technical solution, the mud and water treatment unit includes a sedimentation tank, a clear liquid tank, a mud and water filter press and a suction pipeline. The input end of the sedimentation tank is connected to the output end of the regulating tank, the input end of the clear liquid tank is connected to the output end of the sedimentation tank, and the output end of the clear liquid tank is supplied with purified wastewater through a pipeline to a pickling line, a flushing and sorting line and a secondary treatment line; the bottoms of the sedimentation tank and the clear liquid tank are both connected to one end of the suction pipeline, the other end of the suction pipeline is connected to the mud and water filter press, and the sewage output end of the mud and water filter press is connected to the sedimentation tank.

[0015] As an improvement of the above technical solution, the acid supply device includes a heating tank, a storage tank and a conveying pipeline. The input end of the heating tank is connected to the output end of the storage tank, and the output end of the heating tank is connected to the second pickling tank and the pickling line through the conveying pipeline.

[0016] As an improvement of the above technical solution, the washing and sorting line includes a cylinder that can rotate around its own axial center, a transmission device and a base frame, the transmission device is fixed on the base frame, the cylinder is installed on the transmission device, and a main conveyor belt and a waste conveyor belt are arranged on the discharge end of the cylinder; the waste conveyor belt is arranged parallel to the side and lower part of the main conveyor belt; the base frame is provided with a receiving bucket on one side of the main conveyor belt, and the lower end of the receiving bucket is connected to the waste conveyor belt; a spray pipe is inserted in the feed end of the cylinder.

[0017] As an improvement of the above technical solution, the transmission device includes a variable frequency speed regulating motor, a reducer, a coupling, an active friction wheel and a passive friction wheel. The coupling is connected to the variable frequency speed regulating motor through the reducer; the active friction wheel and the passive friction wheel are respectively arranged on both sides of the base frame, the active friction wheel is connected to the coupling, the variable frequency speed regulating motor drives the active friction wheel to rotate through the coupling, the cylinder is mounted between the active friction wheel and the passive friction wheel, and the active friction wheel drives the cylinder to rotate around its own axial center through friction force to stir the material.

[0018] As an improvement of the above technical solution, it also includes a color sorting processing line, which includes a frame, a feed hopper, a receiving hopper, a negative pressure suction channel, a driving mechanism, a color sorting device and a discharging device. The feed hopper is used to receive materials discharged by the pickling line and is arranged on the frame; both ends of the receiving hopper are swingably connected to the frame through a rotating shaft, and the receiving hopper is located below the feed hopper and receives the materials output by the feed hopper; the negative pressure suction channel is arranged between the feed hopper and the receiving hopper; the driving mechanism is installed on the frame, and the driving end of the driving mechanism is hinged to the receiving hopper to drive the receiving hopper to swing back and forth around the rotating shaft; the color sorting device is arranged below the frame, and the feeding end of the color sorting device is connected to the discharging end of the receiving hopper; the discharging device is arranged at the output end of the color sorting device, and is used to respectively receive qualified quartz sand and defective quartz sand output by the color sorting device; the discharging device sends the defective quartz sand to the pickling line, and the discharging device sends the qualified quartz sand to the fine crushing line.

[0019] A method for producing quartz sand comprises the following steps:

[0020] Step 1, raw material processing: the quartz ore is preliminarily sorted and crushed step by step until the particle size is less than 30 mm to obtain quartz sand;

[0021] Step 2, quartz sand cleaning: the quartz sand obtained after multi-stage crushing is cleaned and graded by the drum ore washer of the washing and sorting line to obtain blocks of different particle sizes; the large particles of ore with impurity shells discharged by the drum ore washer are manually picked out and conveyed to the pickling line through the waste conveyor belt for acid leaching. The acid leaching solution is an aqueous solution containing a metal chelating agent and an organic acid, with a solid-liquid weight ratio of 0.8-1:1, heated to 30-40°C, and 400-800W ultrasonic field is used. acid leaching for 60-100 minutes under the conditions of 1:2-5, filter out the first acid leaching solution by suction, wash with deionized water at 70-80°C until the filtrate is neutral; then immerse in the second acid leaching solution, the solid-liquid weight ratio is 1:2-5, heat to 60-80°C, acid leaching for 20-40 minutes under stirring conditions, filter out the second acid leaching solution by suction, wash with deionized water at 70-80°C until the filtrate is neutral; and pass the acid-washed quartz sand and the un-acid-washed quartz sand through a drum ore washer for a second washing and sorting to obtain primary quartz sand;

[0022] Step 3, color sorting: the primary quartz sand discharged from the pickling line is color sorted to obtain qualified quartz sand and defective quartz sand. The discharge device transports the defective quartz sand to the pickling line, and the discharge device transports the qualified quartz sand to the fine crushing line for secondary fine crushing;

[0023] Step 4, preparation of quartz fine sand: the coarse quartz sand discharged by the discharge device is sent to the fine crushing line for secondary fine crushing; the screening mechanism receives the material output by the fine crushing line and classifies and screens the material, the screening mechanism is provided with a finished product discharge port and a defective product discharge port, the defective product discharge port sends the defective quartz sand to the secondary processing line for secondary fine processing, the output end of the secondary processing line and the finished product discharge port both send the quartz sand material to the drying line, the drying line dries the quartz sand material at 200-300°C for 2-3 hours, so that the water content of the quartz sand does not exceed 0.1%; obtain quartz fine sand;

[0024] Step 5, post-processing: The drying line sends the dried fine quartz sand to the multi-stage powder screen for particle size screening. Each outlet of the multi-stage powder screen is de-ironized by an iron remover, and the final screening is performed by a vibrating screen before packaging and storage, completing the quartz sand processing.

[0025] Compared with the prior art, the beneficial effects of this application are:

[0026] The quartz sand production line of the present invention uses a multi-stage crushing line, a flushing and sorting line and a pickling line in the sand making system, so that the quartz ore can be converted into quartz sand with a smaller particle size and less impurities; a screening mechanism and a secondary processing line are designed, and the fine quartz sand processed by the fine crushing line is screened and graded by the screening mechanism, so that the quartz sand containing the impurity shell obtained after the secondary crushing in the fine crushing line is separated from the finished quartz sand, and the quartz sand containing the impurity shell is processed by the secondary processing line, so as to improve the recycling of the quartz sand; in addition, the acid supply device is used to provide cleaning acid to the pickling line, so as to improve the efficiency of the reaction and realize the automatic control of the reaction amount; the regulating tank is used to neutralize the wastewater discharged by the pickling line, the flushing and sorting line and the secondary processing line, and the mud water treatment unit is used to effectively remove the particulate matter contained in the above wastewater, so as to realize the recycling and reuse of the wastewater. The present invention also provides a quartz sand production method, which is easy to operate, convenient to process, and can effectively ensure the quality of the product and the generation of waste products. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0028] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0029] Figure 2 The structure of the washing and sorting line in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0030] Figure 3 The structure of the washing and sorting line in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0031] Figure 4 A cross-sectional view of a flushing and sorting line in an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of a color sorting processing line in an embodiment of the present invention;

[0033] Figure 6 A top view of a color sorting processing line in an embodiment of the present invention;

[0034] Figure 7 for Figure 6 The cross-sectional view along the AA direction;

[0035] Figure 8 It is a structural schematic diagram of a sand making system in an embodiment of the present invention;

[0036] Fig. 9 A schematic diagram of the internal structure of the screening mechanism in an embodiment of the present invention;

[0037] Fig.10It is a structural schematic diagram of a secondary processing line in an embodiment of the present invention;

[0038] Fig.11 It is a structural schematic diagram of a storage system in an embodiment of the present invention;

[0039] Fig.12 Schematic diagram of the structure of the water circulation system in an embodiment of the present invention.

[0040] In the figure: ore washing and sorting system 1, multi-stage crushing line 11, flushing and sorting line 12, cylinder 121, chassis 122, main conveyor belt 123, waste conveyor belt 124, receiving bucket 125, variable frequency speed regulating motor 126, reducer 127, coupling 128, active friction wheel 129, passive friction wheel 12a, spray pipe 12b, screen cage 12c, guide plate 12d, pickling line 13, first pickling tank 131, storage hopper 132, cylindrical ore washing machine 133, sand making system 2, fine crushing line 21 , impact crusher 211, fine crusher 212, screening mechanism 22, finished product discharge port 221, defective product discharge port 222, screening tank 223, feed port 224, first sieve plate 225, second sieve plate 226, high frequency vibrator 227, secondary processing line 23, magnetic separator 231, dewatering screen 232, temporary storage bucket 233, material bag 234, second pickling tank 235, gantry hanger 236, track 237, drying line 24, water circulation system 3, acid supply device 31, heating tank 311, storage Material tank 312, conveying pipeline 313, regulating tank 32, mud water treatment unit 33, sedimentation tank 331, clear liquid tank 332, water collecting tank 333, mud water filter press 334, suction pipeline 335, first suction pump 336, sludge storage tank 337, regulating component 34, neutralization tank 341, regulating valve 342, spray pipeline 343, storage system 4, elevator 41, storage box 42, collecting hopper 43, multi-stage powder screen 44, iron remover 45, vibrating screen 46, color sorting processing line 5, rack 5 1. Feed hopper 52, receiving hopper 53, receiving part 531, discharging part 532, negative pressure suction channel 54, driving mechanism 55, rotating motor 551, cam 552, driving rod 553, color sorting device 56, feed slide 561, sorting box 562, spray valve 563, light source 564, background plate 565, sensor 566, upper feed port 567, diverter plate 568, finished product channel 569, defective product channel 56a, discharge device 57, defective product conveyor belt 571, finished product conveyor belt 572 DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] like Figures 1 to 12 As shown, the present invention provides a quartz sand production line, including a ore washing and sorting system 1, a sand making system 2, a water circulation system 3, a storage system 4 and a color sorting processing line 5, wherein the ore washing and sorting system 1 includes a multi-stage crushing line 11, a flushing and sorting line 12 and a pickling line 13 connected in sequence; the sand making system 2 includes a fine crushing line 21, a screening mechanism 22, a secondary processing line 23 and a drying line 24, the input end of the fine crushing line 21 is connected to the output end of the pickling line 13, the screening mechanism 22 is used to receive the material output by the fine crushing line 21 and grade and screen the material, the screening mechanism 22 is provided with a finished product discharge port 221 and a defective product discharge port 222, the defective product discharge port 222 is connected to the input end of the secondary processing line 23, the output end of the secondary processing line 23 and the finished product discharge port 221 are connected to the input end of the drying line 24; the water circulation system 3 includes an acid supply device 31, a regulating tank 32 and a muddy water treatment unit 33, the output end of the acid supply device 31 is connected to the pickling line 13, the acid supply device 31 is used to heat and supply cleaning acid to the pickling line 13, the regulating tank 32 is used to receive the wastewater discharged from the pickling line 13, the flushing and sorting line 12 and the secondary treatment line 23, and the regulating tank 32 is provided with a regulating component 34 for adjusting the pH value of the wastewater; the input end of the muddy water treatment unit 33 is connected to the regulating tank 32, and the output end of the muddy water treatment unit 33 supplies purified wastewater to the pickling line 13, the flushing and sorting line 12 and the secondary treatment line 23 through a pipeline; the storage system 4 is used to receive the finished quartz sand output by the drying line 24. The color sorting treatment line 5 is arranged between the pickling line 13 and the fine crushing line 21, and is used to remove the quartz sand treated by the pickling line 13. It should be noted that in the present application, the multi-stage crushing line 11 is composed of a plurality of crushers connected in sequence, wherein the crushing particle size of these crushers gradually decreases along the processing direction, so as to facilitate the processing of relatively large quartz ore into quartz sand with a particle size less than 30 mm. Since the crushers used in the multi-stage crushing line 11 are relatively common, the specific structure of the crusher is not described in detail in this application. You may refer to the specific structure of a dust-free and low-noise stone crusher in patent ZL201720769085.9, which is not described in detail in this application. It should be noted that in Figure 1 The qualified products directly sorted out by the washing and sorting line 12 will be directly sent to the color sorting processing line 5 or other storage structures, while the unqualified products will be sent to the pickling line 13. Figure 1The mark YES in the intermediate ore washing and sorting system 1 represents qualified products, and the mark NO represents unqualified products. Unqualified quartz sand needs to be pickled; while the mark YES in the sand making system 2 represents qualified products screened out by the screening mechanism 22, and the mark NO represents unqualified products.

[0043] See also Figures 1 to 4 The washing and sorting line 12 comprises a cylinder 121 that can rotate around its own axial center, a transmission device and a base frame 122. The transmission device is fixed on the base frame 122, and the cylinder 121 is installed on the transmission device. The discharge end of the cylinder 121 is provided with a main conveyor belt 123 and a waste conveyor belt 124; the waste conveyor belt 124 is arranged parallel to the side and below the main conveyor belt 123; the base frame 122 is provided with a receiving bucket 125 on one side of the main conveyor belt 123, and the lower end of the receiving bucket 125 is connected to the waste conveyor belt 124; the feed end of the cylinder 121 is inserted with a spray pipe 12b. Among them, several layers of screen cages 12c are coaxially arranged in the cylinder 121, and the mesh size of all the screen cages 12c gradually decreases from the inner layer to the outer layer, and a screening space is formed between any two layers of the screen cages 12c, and the spray pipe 12b is inserted in the innermost screen cage. Among them, the spray pipe 12b is connected to the external pipeline, and it can rinse the ore in the screen cage 12c by continuously spraying water. In the present application, the screen cage 12c is provided with at least two layers, so that two-layer screening can be achieved, and two-level grading and beneficiation can be achieved. In the present application, the cylinder 121 is the outermost structure, and its main purpose is to receive the slurry after cleaning. In addition, it should be explained that the mesh size of the outermost screen cage 12c is smaller than the conventional minimum particle size of quartz sand, and the quartz sand smaller than the mesh size of the outermost screen cage 12c will pass through the outermost screen cage 12c into the cylinder 121, and be discharged together with the slurry, so that the operation of washing and beneficiation of quartz sand with different particle size specifications can be realized.

[0044] In order to facilitate the quartz sand discharged from the screen cage 12c, all the screen cages 12c are provided with guide plates 12d on the feed end of the cylinder 121, and the lower end of the guide plate 12d on the innermost screen cage 12c is connected to the input end of the main conveyor belt 123; the lower ends of the remaining guide plates 12d are connected to the conveyor belt, and the corresponding sorted materials are conveyed outward through the conveyor belt. Since the innermost screen cage 12c cannot filter quartz stones with large particle sizes, the quartz stones discharged by the innermost screen cage 12c are relatively large in size, which is convenient for workers to select. Therefore, the quartz stones discharged by the innermost screen cage 12c are conveyed outward through the main conveyor belt 123. At this time, the operator can stand on one side of the main conveyor belt 123 to pick out unqualified ore pieces, and qualified ore is conveyed outward through the main conveyor belt 123. This part of the ore can be crushed twice to form quartz sand that meets the required particle size. Since the crushing equipment is not the focus of protection of this application, this application will not be described in detail. The output end of the waste conveyor belt 124 is provided with a receiving box. When the operator selects the unqualified ore, the ore is put into the receiving bucket 125 and finally enters the waste conveyor belt 124. Through the conveyance of the waste conveyor belt 124, these unqualified ores are gradually collected into the receiving box, which is convenient for the worker to carry the entire receiving box to the pickling line 13 for pickling treatment in the future to remove the impurity surface.

[0045] See also Figures 2 to 4 The transmission device includes a variable frequency speed regulating motor 126, a reducer 127, a coupling 128, an active friction wheel 129 and a passive friction wheel 12a. The coupling 128 is connected to the variable frequency speed regulating motor 126 through the reducer 127; the active friction wheel 129 and the passive friction wheel 12a are respectively arranged on both sides of the base frame 122, the active friction wheel 129 is connected to the coupling 128, the variable frequency speed regulating motor 126 drives the active friction wheel 129 to rotate through the coupling 128, the cylinder 121 is mounted between the active friction wheel 129 and the passive friction wheel 12a, and the active friction wheel 129 drives the cylinder 121 to rotate around its own axial center through friction to stir the material.

[0046] It should be noted that the active friction wheel 129 and the passive friction wheel 12a are provided with several pairs in the present application, and are designed according to actual needs. In the present application, the cylinder 121, the active friction wheel 129 and the passive friction wheel 12a are arranged in a triangular shape, and in order to limit the movement of the cylinder 121, an annular groove can be provided on the outer wall at both ends of the cylinder 121, and the active friction wheel 129 and the passive friction wheel 12a are both stuck in the annular groove, and such a setting can avoid the cylinder 121 from moving along its axial direction during the rotation process. In the present application, the rotation centers of all active friction wheels 129 are connected through the main shaft, and the coupling 128 is installed between the main shaft and the variable frequency speed regulating motor 126.

[0047] Based on the existing graded ore washing and beneficiation machine, the washing and sorting line 12 is provided with a main conveyor belt 123 at the discharge end of the cylinder 121 for receiving the ore outputted by the cylinder 121, and a waste conveyor belt 124 is provided on one side of the main conveyor belt 123, so as to facilitate the transportation, transportation and collection of unqualified ore; a receiving bucket is provided to facilitate workers to put unqualified ore on the waste conveyor belt 124, thereby improving the convenience of selection and avoiding the scattering of unqualified ore put by workers. In addition to being able to realize conventional graded ore washing and beneficiation, the washing and sorting line 12 is also convenient for workers to select and collect unqualified ore, reduce labor intensity, and improve the collection and transportation capacity of unqualified ore.

[0048] It should be noted that in the present application, the pickling line 13 can be a conventional quartz sand pickling and cleaning production line, for example, the cylindrical structure of a pickling device for cleaning quartz sand in Chinese patent CN201821597651.3 is used to pickle quartz sand. Of course, the processing capacity of the pickling equipment in the above-mentioned prior art is relatively small and is not suitable for large-scale assembly line quartz sand production. For this reason, the present application provides a specific structure of a pickling line 13. See Figure 1 , wherein the pickling line 13 includes a first pickling tank 131, a storage hopper 132 and a drum ore washer 133, wherein the defective quartz sand containing impurity shells conveyed by the waste conveyor belt 124 is collectively sent to the first pickling tank 131 for soaking, and the soaking time is generally 3-5 hours, and is treated according to the actual impurity situation. The impurity shells in the defective quartz sand after pickling in the first pickling tank 131 have been basically removed. At this time, after a short storage in the storage hopper 132, it can be sent to the drum ore washer 133 for washing to eliminate the acid adhered to the surface of the quartz sand. The washing water used by the drum ore washer 133 can be conventional tap water or wastewater treated by the mud water treatment unit 33, and the wastewater generated by the drum ore washer 133 and the first pickling tank 131 will be sent to the mud water treatment unit 33 for treatment and reuse. The quartz sand cleaned by the drum ore washer 133 will eventually be sent to the color sorting processing line 5.

[0049] See also Figures 5 to 7The color sorting processing line 5 includes a frame 51, a feed hopper 52, a receiving hopper 53, a negative pressure suction channel 54, a driving mechanism 55, a color sorting device 56 and a discharging device 57. The feed hopper 52 is used to receive the materials discharged by the pickling line 13 and is arranged on the frame 51; the two ends of the receiving hopper 53 are swingably connected to the frame 51 through a rotating shaft, and the receiving hopper 53 is located below the feed hopper 52 and receives the materials output by the feed hopper 52; the negative pressure suction channel 54 is arranged between the feed hopper 52 and the receiving hopper 53; the driving mechanism 55 is installed On the frame 51, the driving end of the driving mechanism 55 is hinged to the receiving hopper 53 to drive the receiving hopper 53 to swing back and forth around the rotating shaft; the color sorting device 56 is arranged under the frame 51, and the feeding end of the color sorting device 56 is connected to the discharging end of the receiving hopper 53; the discharging device 57 is arranged at the output end of the color sorting device 56, for respectively receiving the qualified quartz sand and the defective quartz sand output by the color sorting device 56; the discharging device 57 conveys the defective quartz sand to the pickling line 13, and the discharging device 57 conveys the qualified quartz sand to the fine crushing line 21.

[0050] Among them, the receiving hopper 53 includes a receiving part 531 and a discharging part 532. The receiving end of the receiving part 531 is trumpet-shaped. The two ends of the receiving part 531 are rotatably mounted on the frame 51 through a rotating shaft. The discharging part 532 is horizontally provided with a discharging port, and the discharging port is in a straight line shape. The driving mechanism 55 includes a rotating motor 551, a cam 552 mounted on the output end of the rotating motor 551, and a driving rod 553 with one end eccentrically hinged to the cam 552. The rotating motor 551 is mounted on the frame 51, and one end of the driving rod 553 is hinged to the receiving part 531. In addition, the color sorting device 56 can use a conventional color sorting mechanism. For example, the specific color sorting device for quartz stone production in patent CN201920982712.6 can be referred to. This application will not be described in detail here.

[0051] See also Figure 6 and Figure 7In one embodiment of the present application, the color sorting device 56 includes a feed slide 561, a sorting box 562, a spray valve 563, a light source 564, a background plate 565 and a sensor 566. The sorting box 562 is detachably mounted on the frame 51; the upper part of the sorting box 562 is provided with an upper feed port 567, and the lower part is provided with a discharge channel; the lower end of the feed slide 561 is obliquely connected to the upper feed port 567; the upper end of the feed slide 561 is connected to the discharge part 532; the light source 564, the background plate 565 and the sensor 566 are all arranged in the sorting box 562, the spray valve 563 is arranged in the discharge channel, and the sensor 566 is electrically connected to the spray valve 563; the discharge device 57 is arranged below the discharge end of the discharge channel. The feed slide 561 in the present application adopts a structure with a plurality of parallel grooves, so that the quartz sand flows out of the parallel grooves into the sorting box 562. In addition, the light source 564 is arranged at the top of the sorting box 562 and is located on the peripheral side of the upper feed port 567; the background plate 565 is arranged below the upper feed port 567 and is located below the light source 564; the sensor 566 is arranged at the bottom of the sorting box 562 and is located on the peripheral side of the feed end of the discharge channel. The principle of color sorting is relatively common, and can be referred to the description in the background technology of this application, which is not described in detail in this application. The light source 564, the background plate 565 and the sensor 566 are all common components, and common components on the market can be used.

[0052] Among them, a diverter plate 568 is arranged at one end of the discharge channel along the discharge direction thereof, and the diverter plate 568 divides the discharge end of the discharge channel into a finished product channel 569 and a defective product channel 56a, and the spray valve 563 is arranged on the side wall of the discharge channel and located above the diverter plate 568. In order to ensure the stability of the air pressure in the discharge channel, an air inlet hole is arranged in the area of ​​the discharge channel where the spray valve 563 is installed.

[0053] In addition, the discharge device 57 includes a defective conveyor belt 571 and a finished product conveyor belt 572, which are arranged in parallel below the discharge end of the color sorting device 56, wherein the discharge end of the defective channel 56a is connected to the defective conveyor belt 571, and the discharge end of the finished product channel 569 is connected to the finished product conveyor belt 572. Finally, the finished product conveyor belt 572 transfers qualified quartz sand to the fine crushing line 21, and the defective conveyor belt 571 passes the defective quartz sand through the secondary pickling of the pickling line 13 again to remove the impurity shell or completely dissolve the impurities. Of course, the defective quartz sand output by the defective conveyor belt 571 can be directly discarded without the secondary pickling of the pickling line 13 or can be used for other purposes.

[0054] See also Figures 8 to 10The fine crushing line 21 includes an impact crusher 211 and at least two stages of fine crushers 212 connected in sequence, the crushing particle size of the first stage of the fine crusher 212 is larger than the crushing particle size of the second stage of the fine crusher 212; the impact crusher 211 is connected to the discharge end of the last stage of the fine crusher 212, and the screening mechanism 22 is connected to the output end of the impact crusher 211. It should be noted that the fine crusher 212 and the impact crusher 211 are both conventional crushing equipment, and the specific working principle and structure thereof are not described in detail in this application. In addition, in the present application, the screening mechanism 22 is mainly used to sort the impurity shell, the quartz sand containing the impurity shell and the qualified quartz sand; because the impurity shell or the quartz sand containing the impurity shell is harder than the qualified quartz sand due to its texture, when the quartz sand obtained by centrifugal crushing rough processing in the impact crusher 211 is crushed, the size of the impurity shell and the quartz sand containing the impurity shell is larger than the size of the qualified quartz sand after crushing, so the large-particle quartz sand obtained after the screening mechanism 22 in the present application is basically the impurity shell and the quartz sand containing the impurity shell. After the screening process of the above-mentioned screening mechanism 22, the production line can process the impurity shell and the quartz sand containing the impurity shell in a targeted manner, thereby improving the processing quality of the entire quartz sand.

[0055] The screening mechanism 22 includes a screening tank 223, a feeding port 224 is provided at the top of the screening tank 223, a first sieve plate 225 and a second sieve plate 226 are provided in the screening tank 223 from top to bottom, the first sieve plate 225 and the second sieve plate 226 are both tiltedly arranged in the screening tank 223, and the tops of the first sieve plate 225 and the second sieve plate 226 are both connected with a high-frequency vibrator 227, and the screening tank 223 is provided with the finished product discharge port 221 on the bottom side wall of the first sieve plate 225 and the second sieve plate 226; the defective product discharge port 222 is provided at the bottom of the screening tank 223. In order to prevent the dust in the conventional quartz sand from clogging the first sieve plate 225 and the second sieve plate 226, a negative pressure suction mechanism is provided at the top of the screening tank 223, which can effectively remove the flying dust in the quartz sand during screening, and prevent the dust from entering the next processing link with the quartz sand in the later stage. The high frequency vibrator 227 is a conventional device and will not be described in detail in this application.

[0056] See also Figure 8 and Fig.10, the secondary processing line 23 includes a pickling mechanism, a magnetic separator 231 and a dewatering screen 232 arranged in sequence; the pickling mechanism is connected to the output end of the defective material outlet 222 and is used to pickle the defective material output by the defective material outlet 222, the input end of the magnetic separator 231 is connected to the output end of the pickling mechanism, and the output end of the magnetic separator 231 is connected to the input end of the drying line 24 through the dewatering screen 232; the wastewater discharged by the dewatering screen 232 and the pickling mechanism is connected to the regulating tank 32 through a pipeline, and the output end of the muddy water treatment unit 33 supplies purified wastewater to the dewatering screen 232 and the pickling mechanism through a pipeline. In addition, since there are inevitably a few impurity shells that are not completely dissolved in the acid solution during the pickling process, a magnetic separator 231 is used in this application for impurity removal. Since there are more iron-containing substances in the impurity shells, these impurity particles can be effectively adsorbed and removed from the entire quartz sand through the magnetic separator 231. Due to the pickling operation, the entire quartz sand has a high water content, so it is dehydrated twice through the dewatering screen 232. It should be noted that since there is inevitably acid on the surface of the quartz sand, for the quality of the later products, it is necessary to remove the acid on the surface of the quartz sand. Among them, there is a spray pipeline in the dewatering screen 232, and the spray pipeline is used to rinse the quartz sand entering the dewatering screen 232 before dehydration, which is convenient for removing the acid adhering to the surface of the quartz sand. After the rinse is completed, the entire dewatering screen rotates at a high speed and dehydrates by centrifugation. The spray pipeline is connected to the purified wastewater supplied by the mud and water treatment unit 33.

[0057] In the present application, since the defective quartz sand screened by the screening mechanism 22 is relatively small, the pickling mechanism can be a conventional pickling device for cleaning quartz sand, for example, the cylindrical structure of a pickling device for cleaning quartz sand in Chinese patent CN201821597651.3 is used to pickle quartz sand. In one embodiment of the present application, in order to adapt to large-scale quartz sand production, a specific pickling mechanism is provided. The pickling mechanism includes a temporary storage bucket 233, a material bag 234, a second pickling tank 235 and a gantry hanger 236. The feeding end of the temporary storage bucket 233 is connected to the defective product discharge port 222. The second pickling tank 235 is provided with tracks 237 on both opposite sides. The gantry hanger 236 can be slidably mounted on the track 237. The gantry hanger 236 is used to hook the material bag 234 to reciprocate between the temporary storage bucket 233, the second pickling tank 235 and the input end of the magnetic separator 231; the second pickling tank 235 is connected to the regulating tank 32 through a pipeline. In the present application, the gantry hanger 236 can realize the pickling and magnetic separation of materials by hoisting the material bag 234 at different workstations. In fact, there can be multiple material bags 234, and the gantry hanger 236 can be processed at different workstations by hoisting different material bags 234 in turn, so that continuous operation can be achieved and work efficiency can be improved. The temporary storage bucket 233 is mainly used to temporarily store the defective materials output from the defective material outlet 222 to prevent the gantry hanger 236 from hoisting the material bag 234 without collecting the defective materials discharged from the defective material outlet 222 during other processing steps.

[0058] The quartz sand discharged from the dewatering screen 232 is finally transported to the drying line 24 through a conveyor belt for drying and dehydration. The specific structure of the drying line can refer to Patent 201920275294.7 A drying device for quartz sand, which is not described in detail in this application. Fig.11 After being dried by the drying line 24, the quartz sand enters the storage system 4, wherein the storage system 4 includes an elevator 41 and a storage box 42, wherein the elevator 41 is arranged on one side of the storage box 42, and the feed end of the elevator 41 is provided with a collecting hopper 43, and the collecting hopper 43 is connected to the discharge end of the drying line 24. It should be noted that in the present application, the storage box 42 is only for temporary storage of quartz sand, and can also be connected to a finishing or packaging equipment after the storage system 4. In addition, it should be noted that the storage system 4 is also provided with a multi-stage powder screen 44 for particle size screening, and each discharge port of the multi-stage powder screen 44 is de-ironized by an iron remover 45, and the final screening is performed by a vibrating screen 46 before packaging and storage. It should be noted that the iron remover 45 and the vibrating screen 46 are both conventional processing equipment, and the present application does not describe their specific structure and working principle in detail, but the present application requires their functions to achieve the above-mentioned processing purposes.

[0059] See also Figure 1 and Fig.12 In the present application, the washing and sorting line 12, the first pickling tank 131, the drum ore washer 133, the second pickling tank 235, the dewatering screen 232 and other equipment will generate wastewater, especially the first pickling tank 131 and the second pickling tank 235 will generate acidic wastewater, and the wastewater generated by the above equipment contains mud and stone particles. In order to better recycle and treat this part of the wastewater, a mud water treatment unit 33 is designed in the present application. Among them, the mud and water treatment unit 33 includes a sedimentation tank 331, a clear liquid tank 332, a mud and water filter press 334 and a suction pipeline 335. The input end of the sedimentation tank 331 is connected to the output end of the regulating tank 32, the input end of the clear liquid tank 332 is connected to the output end of the sedimentation tank 331, and the output end of the clear liquid tank 332 is supplied with purified wastewater through a pipeline to the pickling line 13, the flushing and sorting line 12 and the secondary treatment line 23; the bottoms of the sedimentation tank 331 and the clear liquid tank 332 are both connected to one end of the suction pipeline 335, the other end of the suction pipeline 335 is connected to the mud and water filter press 334, and the sewage output end of the mud and water filter press 334 is connected to the sedimentation tank 331.

[0060] See also Fig.12 In this application, the regulating tank 32 receives wastewater discharged from the washing and sorting line 12, the first pickling tank 131, the drum ore washer 133, the second pickling tank 235, the dewatering screen 232 and other equipment. The wastewater from the above equipment can be sucked into the regulating tank 32 through pipelines and pumps, which will not be described in detail in this application. Fig.12 In the figure, the reference numerals a, b, and c represent the wastewater access ends of the flushing and sorting line 12, the drum ore washer 133, and the dewatering screen 232. Due to the limited drawings in this application, the circuit diagram of the entire water cycle is not drawn here. Since the regulating tank 32 is acid-washed, the regulating component 34 also includes a neutralization tank 341 and a regulating valve 342. The neutralization tank 341 stores a neutralizing liquid. The regulating valve 342 is arranged on the output end of the neutralization tank 341. The regulating valve 342 is connected to a spray pipeline 343, and the spray pipeline 343 is arranged on the peripheral side of the regulating tank 32. The neutralizing liquid is mainly alkaline solution, which can be conventional lime water; in this application, the spray pipeline 343 is mainly designed on the side wall of the regulating tank 32, and the spraying method is used to increase the efficiency of mixing with the wastewater of the regulating tank 32.

[0061] In the above-mentioned embodiment, the main purpose of the muddy water filter press 334 is to remove the silt in the wastewater. The muddy water filter press 334 is a conventional muddy water separation device. Reference can be made to patent CN201911090232.X, a filter press separation device in a muddy water treatment device, which is not described in detail in this application. In order to better suck the sludge, a first suction pump 336 is provided on the suction pipeline 335. Among them, the muddy water treatment unit 33 also includes a sludge stacking pool 337, which is used to receive the sludge discharged by the muddy water filter press 334. A water collecting tank 333 is provided at the bottom of the sludge stacking pool 337, and the water collecting tank 333 is connected to the sedimentation tank 331 through a recovery pipe. The sludge stacking pool 337 is mainly for facilitating the sludge to drain the water, prevent the accumulation of water in the sludge and reduce the occurrence of odor. The water collecting trough 333 is arranged at one side of the sludge stacking pool 337 , and the bottom of the sludge stacking pool 337 is inclined toward the side of the water collecting trough 333 . Such a design facilitates the confluence of sewage flowing out of the sludge stacking pool 337 .

[0062] Further, in the present application, since both the second pickling tank 235 and the first pickling tank 131 require acid solution for pickling quartz sand, in order to improve the efficiency of the reaction, the acid supply device 31 in the present application includes a heating tank 311, a storage tank 312 and a delivery pipeline 313, the input end of the heating tank 311 is connected to the output end of the storage tank 312, and the output end of the heating tank 311 is connected to the second pickling tank 235 and the pickling line 13 through the delivery pipeline 313. Specifically, in the pickling line 13, the output end of the heating tank 311 is connected to the first pickling tank 131 through the delivery pipeline 313. It should be noted that in the present application, the acid leaching solution supplied by the heating tank 311 is an aqueous solution containing a metal chelating agent and an organic acid, wherein the metal chelating agent includes one or more of ethylenediamine, disodium ethylenediaminetetraacetate, and ammonium citrate, and the mass percentage of the chelating agent in the aqueous solution is 2wt% to 4wt%; the organic acid includes one or more of glycolic acid, oxalic acid, gluconic acid, and dihydroxyethylglycine, and the mass percentage of the organic acid in the aqueous solution is 3wt% to 5wt%. Of course, it can also be a hydrochloric acid-oxalic acid composite acid, wherein the content of HCl is 10-15wt%, and the content of H 2 C 2 0 4 The content is 6-8g / L. The heating tank 311 is provided with an electric heating pipe, and a temperature sensor is provided in the heating tank 311, and the start and stop of the electric heating pipe are automatically controlled by the temperature sensor. The temperature sensor controls the start and stop of the electric heating pipe, which is a conventional technology and is not described in detail in this application.

[0063] The quartz sand production line of the present invention uses a multi-stage crushing line 11, a flushing and sorting line 12 and a pickling line 13 in a sand making system 2, so that the quartz ore can be converted into quartz sand with a smaller particle size and less impurities; a screening mechanism 22 and a secondary processing line 23 are designed, and the screening mechanism 22 is used to perform secondary screening and grading on the fine quartz sand processed by the fine crushing line 21, so that the quartz sand containing the impurity shell obtained after the secondary crushing in the fine crushing line 21 is separated from the finished quartz sand, and the quartz sand containing the impurity shell is subjected to secondary processing by the secondary processing line 23, thereby improving the recycling of the quartz sand; in addition, an acid supply device 31 is used to provide cleaning acid to the pickling line 13, thereby improving the efficiency of the reaction and realizing automatic control of the reaction amount; a regulating tank 32 is used to neutralize the wastewater discharged from the pickling line 13, the flushing and sorting line 12 and the secondary processing line 23, and then a mud water treatment unit 33 is used to effectively remove the particulate matter contained in the above wastewater, thereby realizing the recycling and reuse of the wastewater.

[0064] In addition, the present invention also provides a quartz sand production method, comprising the following steps:

[0065] Step 1, raw material processing: the quartz ore is preliminarily sorted and crushed step by step until the particle size is less than 30 mm to obtain quartz sand;

[0066] Step 2, quartz sand cleaning: the quartz sand obtained after multi-stage crushing is cleaned and graded by the drum ore washer of the washing and sorting line 12 to obtain blocks of different particle sizes; the large particles of ore with impurity shells discharged by the drum ore washer are manually picked out and conveyed to the pickling line 13 through the waste conveyor belt 124 for acid leaching. The acid leaching solution is an aqueous solution containing a metal chelating agent and an organic acid, with a solid-liquid weight ratio of 0.8-1:1, heated to 30-40°C, and heated at a power of 400-800W. Acid leaching for 60-100 minutes under ultrasonic field conditions, remove the first acid leaching solution by suction filtration, wash with 70-80°C deionized water until the filtrate is neutral; then immerse in the second acid leaching solution, the solid-liquid weight ratio is 1:2-5, heat to 60-80°C, acid leaching for 20-40 minutes under stirring conditions, remove the second acid leaching solution by suction filtration, wash with 70-80°C deionized water until the filtrate is neutral; and the acid-washed quartz sand and the un-acid-washed quartz sand are washed and sorted for the second time through a drum ore washer to obtain primary quartz sand;

[0067] Step 3, color sorting: the primary quartz sand discharged from the pickling line 13 is color sorted to obtain qualified quartz sand and defective quartz sand. The discharge device 57 transports the defective quartz sand to the pickling line 13, and the discharge device 57 transports the qualified quartz sand to the fine crushing line 21 for secondary fine crushing;

[0068] Step 4, preparation of quartz fine sand: the coarse quartz sand discharged by the discharge device 57 is sent to the fine crushing line 21 for secondary fine crushing; the screening mechanism 22 receives the material output by the fine crushing line 21 and classifies and screens the material, the screening mechanism 22 is provided with a finished product discharge port 221 and a defective product discharge port 222, the defective product discharge port 222 sends the defective quartz sand to the secondary processing line 23 for secondary fine processing, the output end of the secondary processing line 23 and the finished product discharge port 221 both send the quartz sand material to the drying line 24, the drying line 24 dries the quartz sand material at 200-300°C for 2-3 hours, so that the water content of the quartz sand does not exceed 0.1%; obtain quartz fine sand;

[0069] Step 5, post-processing: The drying line 24 sends the dried fine quartz sand to the multi-stage powder screen 44 for particle size screening. Each outlet of the multi-stage powder screen 44 is de-ironized by the iron remover 45, and the final screening is performed by the vibrating screen 46 before packaging and storage, completing the quartz sand processing.

[0070] The specific operation in the above step 1 is: the quartz ore is preliminarily sorted and crushed step by step through the multi-stage crushing line 11, and crushed to a particle size of less than 30 mm to obtain quartz sand. In step 2, a main conveyor belt 123 is provided at the discharge end of the cylinder 121 to receive the quartz sand ore output by the cylinder 121, and a waste conveyor belt 124 is provided on one side of the main conveyor belt 123 to facilitate the transportation, transportation and collection of unqualified ores; a receiving bucket is provided to facilitate workers to put unqualified ores on the waste conveyor belt 124, thereby improving the convenience of selection and avoiding the scattering of unqualified ores put by workers. Moreover, a screen cage 12c is designed in the cylinder 121, and the mesh size of the outermost screen cage 12c is smaller than the quartz sand with the lowest conventional particle size, and the quartz sand with a mesh size smaller than the outermost screen cage 12c will pass through the outermost screen cage 12c into the cylinder 121 and be discharged together with the slurry, so that the quartz sand washing and beneficiation operations of different particle sizes can be realized. In the color sorting operation in step 3, the color sorting processing line 5 can effectively ensure that the impurities in the entire quartz sand are removed, and the different quartz sands are processed separately by the discharging device 57, so that the quartz sand or impurities containing the impurity shell are sent to the secondary processing line 23 for secondary processing. It should be noted that in the secondary processing line 23, the above-mentioned materials are sequentially passed through a pickling mechanism, a magnetic separator 231 and a dewatering screen 232; so that the quartz sand containing an impurity shell is dissolved by the pickling mechanism, and the impurities are generally iron impurities, and for this reason, the magnetic separator 231 is used to remove the impurities in this part. The design of the secondary processing line 23 enables the quartz sand to improve the processing rate of the quartz raw ore during the production process, thereby improving the quality of the product. The present invention provides a quartz sand production method, which is easy to operate, convenient to process, and can effectively ensure the quality of the product and the generation of waste products.

[0071] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Any modification or equivalent substitution that does not depart from the spirit and scope of the present invention shall be included in the scope of the technical solution of the present invention.

Claims

1. A quartz sand production line, characterized in that: include: The ore washing and sorting system includes a multi-stage crushing line, a washing and sorting line and a pickling line connected in sequence; The sand making system comprises a fine crushing line, a screening mechanism, a secondary processing line and a drying line, wherein the input end of the fine crushing line is connected to the output end of the pickling line, the screening mechanism is used to receive the material output by the fine crushing line and grade and screen the material, the screening mechanism is provided with a finished product discharge port and a defective product discharge port, the defective product discharge port is connected to the input end of the secondary processing line, and the output end of the secondary processing line and the finished product discharge port are both connected to the input end of the drying line; A water circulation system, comprising an acid supply device, a regulating tank and a muddy water treatment unit, wherein the output end of the acid supply device is connected to the pickling line, the acid supply device is used to heat and supply cleaning acid to the pickling line, the regulating tank is used to receive wastewater discharged from the pickling line, the flushing and sorting line and the secondary treatment line, and the regulating tank is provided with a regulating component for adjusting the pH value of the wastewater; the input end of the muddy water treatment unit is connected to the regulating tank, and the output end of the muddy water treatment unit supplies purified wastewater to the pickling line, the flushing and sorting line and the secondary treatment line through a pipeline; and The storage system is used to receive the finished quartz sand output by the drying line.

2. A quartz sand production line according to claim 1, characterized in that: The secondary processing line includes a pickling mechanism, a magnetic separator and a dewatering screen which are arranged in sequence; the pickling mechanism is connected to the output end of the defective material discharge port and is used for pickling the defective materials outputted from the defective material discharge port, the input end of the magnetic separator is connected to the output end of the pickling mechanism, and the output end of the magnetic separator is connected to the input end of the drying line through the dewatering screen; the wastewater discharged by the dewatering screen and the pickling mechanism is connected to the regulating tank through a pipeline, and the output end of the mud water treatment unit supplies purified wastewater to the dewatering screen and the pickling mechanism through a pipeline.

3. A quartz sand production line according to claim 2, characterized in that: The pickling mechanism includes a temporary storage bucket, a material bag, a second pickling tank and a gantry hanger. The feed end of the temporary storage bucket is connected to the defective product discharge port. Tracks are provided on the opposite sides of the second pickling tank. The gantry hanger can be slidably installed on the track. The gantry hanger is used to hook the material bag and reciprocate between the temporary storage bucket, the second pickling tank and the input end of the magnetic separator. The second pickling tank is connected to the regulating tank through a pipeline.

4. A quartz sand production line according to claim 1, characterized in that: The screening mechanism includes a screening tank, a feed port is provided on the top of the screening tank, a first sieve plate and a second sieve plate are provided in sequence from top to bottom in the screening tank, the first sieve plate and the second sieve plate are both obliquely arranged in the screening tank, the top ends of the first sieve plate and the second sieve plate are both connected to high-frequency vibrators, the screening tank is provided with the finished product discharge port on the bottom end side walls of the first sieve plate and the second sieve plate; the defective product discharge port is arranged at the bottom of the screening tank.

5. A quartz sand production line according to claim 1, characterized in that: The mud and water treatment unit includes a sedimentation tank, a clear liquid tank, a mud and water filter press and a suction pipeline. The input end of the sedimentation tank is connected to the output end of the regulating tank, the input end of the clear liquid tank is connected to the output end of the sedimentation tank, and the output end of the clear liquid tank is supplied with purified wastewater through a pipeline to a pickling line, a flushing and sorting line and a secondary treatment line; the bottoms of the sedimentation tank and the clear liquid tank are both connected to one end of the suction pipeline, the other end of the suction pipeline is connected to the mud and water filter press, and the sewage output end of the mud and water filter press is connected to the sedimentation tank.

6. A quartz sand production line according to claim 3, characterized in that: The acid supply device comprises a heating tank, a storage tank and a conveying pipeline. The input end of the heating tank is connected to the output end of the storage tank, and the output end of the heating tank is connected to the second pickling tank and the pickling line through the conveying pipeline.

7. A quartz sand production line according to claim 3, characterized in that: The washing and sorting line includes a cylinder that can rotate around its own axial center, a transmission device and a base frame, the transmission device is fixed on the base frame, and the cylinder is installed on the transmission device. A main conveyor belt and a waste conveyor belt are arranged on the discharge end of the cylinder; the waste conveyor belt is arranged parallel to the side and lower part of the main conveyor belt; the base frame is provided with a receiving bucket on one side of the main conveyor belt, and the lower end of the receiving bucket is connected to the waste conveyor belt; a spray pipe is inserted in the feed end of the cylinder.

8. A quartz sand production line according to claim 7, characterized in that: The transmission device includes a variable frequency speed regulating motor, a reducer, a coupling, an active friction wheel and a passive friction wheel. The coupling is connected to the variable frequency speed regulating motor through the reducer; the active friction wheel and the passive friction wheel are respectively arranged on both sides of the base frame, the active friction wheel is connected to the coupling, the variable frequency speed regulating motor drives the active friction wheel to rotate through the coupling, the cylinder is mounted between the active friction wheel and the passive friction wheel, and the active friction wheel drives the cylinder to rotate around its own axial center through friction force to stir the material.

9. A quartz sand production line according to any one of claims 1 to 8, characterized in that: It also includes a color sorting processing line, which includes a frame, a feed hopper, a receiving hopper, a negative pressure suction channel, a driving mechanism, a color sorting device and a discharging device. The feed hopper is used to receive materials discharged by the pickling line and is arranged on the frame; both ends of the receiving hopper are swingably connected to the frame through a rotating shaft, and the receiving hopper is located below the feed hopper and receives materials output by the feed hopper; the negative pressure suction channel is arranged between the feed hopper and the receiving hopper; the driving mechanism is installed on the frame, and the driving end of the driving mechanism is hinged to the receiving hopper to drive the receiving hopper to swing back and forth around the rotating shaft; the color sorting device is arranged below the frame, and the feeding end of the color sorting device is connected to the discharging end of the receiving hopper; the discharging device is arranged at the output end of the color sorting device, and is used to respectively receive qualified quartz sand and defective quartz sand output by the color sorting device; the discharging device conveys the defective quartz sand to the pickling line, and the discharging device conveys the qualified quartz sand to the fine crushing line.

10. A method for producing quartz sand, characterized in that: The following steps are involved: Step 1, raw material processing: the quartz ore is preliminarily sorted and crushed step by step until the particle size is less than 30 mm to obtain quartz sand; Step 2, quartz sand cleaning: the quartz sand obtained after multi-stage crushing is cleaned and graded by the drum ore washer of the washing and sorting line to obtain blocks of different particle sizes; the large particles of ore with impurity shells discharged by the drum ore washer are manually picked out and conveyed to the pickling line through the waste conveyor belt for acid leaching. The acid leaching solution is an aqueous solution containing a metal chelating agent and an organic acid, with a solid-liquid weight ratio of 0.8-1:1, heated to 30-40°C, and 400-800W ultrasonic field is used. acid leaching for 60-100 minutes under the conditions of 1:2-5, filter out the first acid leaching solution by suction, wash with deionized water at 70-80°C until the filtrate is neutral; then immerse in the second acid leaching solution, the solid-liquid weight ratio is 1:2-5, heat to 60-80°C, acid leaching for 20-40 minutes under stirring conditions, filter out the second acid leaching solution by suction, wash with deionized water at 70-80°C until the filtrate is neutral; and pass the acid-washed quartz sand and the un-acid-washed quartz sand through a drum ore washer for a second washing and sorting to obtain primary quartz sand; Step 3, color sorting: the primary quartz sand discharged from the pickling line is color sorted to obtain qualified quartz sand and defective quartz sand. The discharge device transports the defective quartz sand to the pickling line, and the discharge device transports the qualified quartz sand to the fine crushing line for secondary fine crushing; Step 4, preparation of quartz fine sand: the coarse quartz sand discharged by the discharge device is sent to the fine crushing line for secondary fine crushing; the screening mechanism receives the material output by the fine crushing line and classifies and screens the material, the screening mechanism is provided with a finished product discharge port and a defective product discharge port, the defective product discharge port sends the defective quartz sand to the secondary processing line for secondary fine processing, the output end of the secondary processing line and the finished product discharge port both send the quartz sand material to the drying line, the drying line dries the quartz sand material at 200-300°C for 2-3 hours, so that the water content of the quartz sand does not exceed 0.1%; obtain quartz fine sand; Step 5, post-processing: The drying line sends the dried fine quartz sand to the multi-stage powder screen for particle size screening. Each outlet of the multi-stage powder screen is de-ironized by an iron remover, and the final screening is performed by a vibrating screen before packaging and storage, completing the quartz sand processing.

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