Purification process for preparing and processing 5N2-grade high-purity quartz sand from quartz ore

Abstract

The invention belongs to the technical field of preparation and purification of high-purity quartz sand, and particularly relates to a purification process for preparing and processing 5N2-grade high-purity quartz sand from quartz ore, which comprises the following steps: putting a magnetic separation non-magnetic product obtained in the step S3 into an acid pickling tank for full hydrochloric acid acid pickling, and after acid pickling, falling acid pickling sand into a flushing tank for flushing, the bottom of the pickling tank is communicated with a washing pool, the top of the pickling tank is communicated with a plurality of feeding ports, a stirring shaft pipe is mounted in the pickling tank, a plurality of stirring rods are connected and mounted on the stirring shaft pipe, a filter screen is mounted in the washing pool, a stirring sand discharging mechanism is arranged on the filter screen, and a plurality of groups of spraying assemblies are mounted at the top of the washing pool; according to the high-purity quartz sand purification process, the occupied space of acid washing equipment used in the high-purity quartz sand purification process can be reduced, and corrosion and blockage of a flow guide pipe or other equipment when acid washing liquid or acid washing sand is discharged can be reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of preparation and purification of high-purity quartz sand, and particularly relates to a purification process for preparing and processing 5N2 grade high-purity quartz sand from quartz ore. Background Art

[0002] Quartz sand is an important industrial raw material with good physical and chemical properties and is widely used in fields such as semiconductor chips, quartz crucibles, light sources, building materials, optical fibers, and photovoltaics. High-purity quartz sand, especially high-purity quartz sand with a SiO2 content of ≥99.99%, is mainly obtained through natural crystal processing, quartz mineral purification and impurity removal, or chemical preparation and synthesis methods.

[0003] Purifying quartz sand through a mixed pickling process can reduce the content of mineral impurity elements. With the development of science and technology, the purity requirement for quartz sand is getting higher and higher, and the pickling step in the quartz sand purification process is relatively important, aiming to remove iron oxides, other oxides, and acid-soluble impurities on the surface of quartz sand.

[0004] However, the pickling equipment used in the existing pickling process steps can only simply pickle quartz sand, and the pickled sand after pickling needs to be transported to the rinsing equipment for rinsing through the cooperation of a long conduit and a pump body. Obviously, since the pickling equipment and the rinsing equipment are independently set, it will only increase the site occupied by the pickling and rinsing equipment used in the quartz sand purification process, and the pickling solution or pickled sand will corrode and block the diversion pipe or other equipment when discharged, thereby affecting the purification efficiency and quality of high-purity quartz sand. Summary of the Invention

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention is a purification process for preparing and processing 5N2 grade high-purity quartz sand from quartz ore, and the process includes the following steps:

[0007] Step S1: Coarsely crush and screen the raw ore sample to obtain intermediate products with a particle size of 0.5 - 3 cm and fine product 1. Wash the intermediate particle size products to remove ore mud, and then perform color sorting using a color sorter to obtain quartz rough materials and waste materials;

[0008] Step S2: Place the quartz rough materials obtained in Step S1 in a calcination furnace for calcination at 800 - 1000 degrees Celsius, with a calcination time of 15 - 30 minutes, and then quickly take it out and pour it into cold water for water quenching treatment to obtain quartz clinker;

[0009] Step S3: Sand the quartz clinker obtained in Step S2 and classify it to obtain quartz raw sand with an intermediate particle size and fine-grained products; Feed the obtained quartz raw sand into a magnetic separation device for magnetic separation operation to obtain magnetic products and non-magnetic products;

[0010] Step S4: Feed the non-magnetic product obtained in Step S3 into a pickling tank for full hydrochloric acid pickling. After pickling, the pickled sand falls into a rinsing pool for rinsing to obtain pickled sand;

[0011] Step S5: Pulp the pickled product obtained in Step S4, and sequentially add an inhibitor, a regulator, an activator, and a collector for flotation to obtain flotation concentrate;

[0012] Step S6: Dehydrate the flotation concentrate obtained in Step S5, then perform high-temperature sand roasting. The sand roasting temperature is 700 - 1100 degrees Celsius, and the sand roasting time is 5 - 15 minutes. Then place the dried and washed sand in a high-temperature chlorination furnace for chlorination reaction. The high-temperature chlorination temperature is 1000 - 1200 degrees Celsius to obtain high-purity quartz sand;

[0013] Among them, the bottom of the pickling tank is connected to a rinsing pool, the top of the pickling tank is connected to multiple feed ports, and a stirring shaft tube is installed inside the pickling tank. Multiple stirring rods are connected and installed on the stirring shaft tube. A filter screen is installed in the rinsing pool, and a stirring and sand discharging mechanism is arranged on the filter screen. Multiple groups of spraying components are installed on the top of the rinsing pool.

[0014] Further, the stirring and sand discharging mechanism includes a cylinder part. The bottom of the stirring shaft tube extends above the bottom of the pickling tank. The cylinder part is fixedly arranged inside the bottom of the stirring shaft tube, and the bottom of the output rod of the cylinder part is connected with a cylindrical plug;

[0015] The diameter of the cylindrical plug is the same as the inner diameter of the bottom pipe orifice of the pickling tank. The bottom of the cylindrical plug is connected with an inclined surface convex platform, and multiple pushing blocks are installed in a circumferential array at the bottom of the inclined surface convex platform. The bottom side of each pushing block is connected with a stirring rod;

[0016] The outer circumferential surface of the filter screen is connected to the pool wall of the rinsing pool through an elastic ring. The bottom of the center of the filter screen is connected with a discharge conduit, and the discharge conduit extends out of the bottom of the rinsing pool. A blocking and discharging component is arranged inside the discharge conduit.

[0017] Further, the blocking and discharging component includes a blocking plug. A stepped blanking hole is opened at the center of the filter screen, and the upper hole bottom of the stepped blanking hole is in a slope shape. The blocking plug is hermetically inserted into the upper hole orifice of the stepped blanking hole;

[0018] A shaft rod is vertically fixedly arranged on the lower surface of the blocking plug, and the bottom of the shaft rod is connected to the inner wall of the discharge conduit through a bearing and an inclined rod. And a spiral blade is sleeved on the shaft rod;

[0019] The upper surface of the plugging block is fixedly provided with a square insertion block. A recessed groove is opened at the bottom of the inclined surface boss, and a square insertion hole is opened at the top of the recessed groove. The square insertion hole corresponds to the square insertion block.

[0020] Furthermore, the plugging and discharging assembly further includes an extension disk. The extension disk is fixedly arranged at the upper pipe orifice of the discharging conduit. A support disk is fixedly arranged on the lower surface of the filter screen at the bottom of the stepped blanking hole. A double-layer elastic membrane tube is arranged between the upper surfaces of the support disk and the extension disk. A plurality of support guide rods are installed on the lower surface of the support disk. A plurality of guiding sliding sleeves are fixedly arranged on the extension disk. And each support guide rod is slidably inserted into each guiding sliding sleeve. An electromagnetic suction block is insulatingly installed on the inner wall of each guiding sliding sleeve. Each support guide rod is insulatingly embedded in a metal strip, and the metal strip is in corresponding contact with the electromagnetic suction block. Each support guide rod extends out of the bottom of the guiding sliding sleeve and is connected with a limiting ring. The plurality of support guide rods are located between the double-layer elastic membrane tube. A spring member is connected between the support disk and the extension disk, and the spring member is sleeved on the support guide rod.

[0021] Furthermore, an inclined surface boss is arranged on the upper top of the plugging block, and the total thickness of the inclined surface boss and the plugging block is less than the depth of the recessed groove.

[0022] Furthermore, the spraying assembly includes nozzles. A plurality of nozzles are installed on the top of the flushing pool in a circumferential array. A plurality of nozzles located in the same radial direction are communicated through a liquid guiding pipe at the top, and a connecting flange is arranged at the end of the liquid guiding pipe.

[0023] Furthermore, a plurality of liquid discharging conduits are communicated at the connection part between the inclined bottom of the flushing pool and the discharging pipe, and the plurality of liquid discharging conduits are communicated with an annular collecting box. The annular collecting box is located on the outer circumferential surface at the bottom of the flushing pool.

[0024] Furthermore, the magnetic separation device is one or more of a high-gradient magnetic separator and an electromagnetic slurry machine, the magnetic field intensity is 1.6 - 1.8T, and the types of acids used in the pickling tank are one or more of hydrofluoric acid, phosphoric acid, nitric acid, sulfuric acid, and hydrochloric acid.

[0025] The present invention has the following beneficial effects:

[0026] 1. The present invention integrally designs the pickling and flushing equipment used in the purification process. It can not only reduce the site occupied by the pickling and flushing equipment used in the purification process of high-purity quartz sand, but also, since the pickling tank and the flushing pool are directly communicated, the pickled sand and pickling solution after pickling will directly fall into the flushing pool, without the need to separately discharge the pickling solution and pickled sand through a diversion pipe, thereby being able to reduce the corrosion and blockage of the diversion pipe or other equipment when the pickling solution or pickled sand is discharged.

[0027] 2. The stirring sand discharging mechanism disclosed in the present invention can not only seal and divide the pickling tank and the flushing pool to achieve accurate pickling treatment of quartz sand, but also drive a plurality of stirring rods to rotate in the flushing pool to stir and wash the pickled sand. The downward movement of the pushing block to push the filter screen can also cause the center of the filter screen to sink downward, automatically open the plugging and discharging assembly, and enable the washed quartz sand to automatically flow into the discharging conduit along with the filter screen with a sunken center for discharging, dehydration, and drying treatment. Therefore, the stirring sand discharging mechanism can, without affecting the efficient pickling of quartz sand in the pickling tank, automatically and quickly discharge the washed quartz sand from the flushing pool for dehydration and drying treatment.

[0028] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0030] Figure 1 It is the process flow diagram of the purification process disclosed in the present invention;

[0031] Figure 2 It is the structural schematic diagram of the pickling tank and the flushing pool disclosed in the present invention;

[0032] Figure 3 It is the cross-sectional view of the pickling tank disclosed in the present invention;

[0033] Figure 4 It is the internal structural schematic diagram of the flushing pool disclosed in the present invention;

[0034] Figure 5 It is the cross-sectional view of the inclined plane convex platform disclosed in the present invention;

[0035] Figure 6 It is the cross-sectional view of the flushing pool disclosed in the present invention;

[0036] Figure 7 It is disclosed in the present invention Figure 6 The partial enlarged view at A in the figure.

[0037] In the figure: 1. Pickling tank;

[0038] 2. Flushing pool;

[0039] 3. Stirring shaft tube; 31. Stirring rod;

[0040] 4. Filter screen; 41. Step blanking hole;

[0041] 5. Stirring sand discharging mechanism; 51. Cylinder part; 52. Cylindrical plug; 53. Inclined plane boss; 531. Concave groove; 532. Square jack; 54. Pushing block; 55. Stirring rod; 56. Discharge conduit; 57. Extension disk; 58. Inclined plane table

[0042] 6. Blocking and discharging assembly; 61. Blocking plug; 62. Shaft rod; 64. Spiral blade; 65. Square insert block; 66. Support disk; 67. Guide sliding sleeve; 68. Support guide rod; 681. Metal strip; 69. Elastic membrane tube

[0043] 7. Spraying assembly; 71. Nozzle; 72. Liquid guide pipe; 73. Connecting flange

[0044] 8. Liquid discharge conduit

[0045] 9. Annular collection box Specific implementation mode

[0046] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present invention.

[0047] In the description of the present invention, it should be understood that the terms "open hole", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating the orientation or position relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0048] Please refer to Figures 1-7 As shown, the present invention is a purification process for preparing 5N2 grade high-purity quartz sand from quartz ore, and the process includes the following steps:

[0049] Step S1: Coarse crush and screen the original ore sample to obtain intermediate products with a particle size of 0.5 - 3 cm and fine particle product 1. Wash the intermediate particle size products to remove the ore mud, and then perform color sorting with a color sorter to obtain quartz rough materials and waste materials;

[0050] Step S2: Place the quartz rough materials obtained in step S1 in a calcination furnace for calcination at 800 - 1000 degrees Celsius, and the calcination time is 15 - 30 minutes. Then quickly take it out and pour it into cold water for water quenching treatment to obtain quartz clinker;

[0051] Step S3: Sand the quartz clinker obtained in step S2 and classify it to obtain quartz raw sand with an intermediate particle size and fine-grained products; put the obtained quartz raw sand into a magnetic separation device for magnetic separation operation to obtain magnetic products and non-magnetic products;

[0052] Step S4: Put the non-magnetic product obtained in step S3 into pickling tank 1 for full hydrochloric acid pickling. After pickling, the pickled sand falls into rinsing tank 2 for rinsing to obtain pickled sand;

[0053] Step S5: Pulp the pickled product obtained in step S4, and sequentially add an inhibitor, a regulator, an activator, and a collector for flotation to obtain flotation concentrate;

[0054] Step S6: Dehydrate the flotation concentrate obtained in step S5, then perform high-temperature sand roasting. The sand roasting temperature is 700 - 1100 °C, and the sand roasting time is 5 - 15 minutes. Then place the dried and washed sand in a high-temperature chlorination furnace for chlorination reaction. The high-temperature chlorination temperature is 1000 - 1200 °C to obtain high-purity quartz sand;

[0055] Among them, the bottom of pickling tank 1 is connected to rinsing tank 2. The top of pickling tank 1 is connected to a plurality of feed inlets. A stirring shaft tube 3 is installed in pickling tank 1, and a plurality of stirring rods 31 are connected and installed on the stirring shaft tube 3. A filter screen 4 is installed in rinsing tank 2, and a stirring and sand discharging mechanism 5 is arranged on the filter screen 4. A plurality of groups of spraying components 7 are installed on the top of rinsing tank 2;

[0056] Specifically, the present invention integrates the pickling and rinsing equipment used in the purification process. This not only reduces the floor space occupied by the pickling and rinsing equipment used in the purification process of high-purity quartz sand, but also, since the pickling tank 1 and the rinsing tank 2 are directly connected, the pickled sand and pickling solution after pickling will directly fall into the rinsing tank 2, eliminating the need to separately discharge the pickling solution and pickled sand through a diversion pipe. This can reduce the corrosion and blockage of the diversion pipe or other equipment when the pickling solution or pickled sand is discharged. The pickled sand and pickling solution after pickling will synchronously fall into the rinsing tank 2. At this time, the pickling solution will initially rinse the pickled sand falling into the rinsing tank 2, and the filter screen 4 in the rinsing tank 2 will intercept the falling quartz sand, causing iron oxides, other oxides, and acid-soluble impurities in the quartz sand to be discharged synchronously with the pickling solution. When the pickled sand falls into the rinsing tank 2, the agitating sand discharging mechanism 5 will agitate the continuously falling pickled sand, enabling the pickling solution to fully contact the pickled sand, achieving not only the effect of preliminary rinsing but also the effect of secondary pickling. After the pickling solution is completely discharged from the rinsing tank 2, multiple spraying components 7 will operate to evenly spray the rinsing liquid into the rinsing tank 2. At this time, the agitating sand discharging mechanism 5 will continuously agitate the quartz sand on the filter screen 4, thereby accelerating the rinsing efficiency of the pickled quartz sand. The rinsed wastewater can rinse and discharge the pickling solution remaining on the inner wall of the rinsing tank 2, facilitating the rinsing tank 2 to rinse the pickled sand again. The rinsed quartz sand will be discharged out of the rinsing tank 2 downward through the center of the filter screen 4, then dried and dehydrated by a drying device, and then subjected to subsequent purification processing.

[0057] In this embodiment, the agitating sand discharging mechanism 5 includes a cylinder member 51. The bottom of the agitating shaft tube 3 extends above the bottom of the pickling tank 1. The cylinder member 51 is fixedly arranged inside the bottom of the agitating shaft tube 3. The bottom of the output rod of the cylinder member 51 is connected to a cylindrical plug 52. The diameter of the cylindrical plug 52 is the same as the inner diameter of the bottom pipe orifice of the pickling tank 1. The bottom of the cylindrical plug 52 is connected to an inclined surface boss 53, and a plurality of pushing blocks 54 are circumferentially arranged at the bottom of the inclined surface boss 53. The bottom side of each pushing block 54 is connected to an agitating rod 55. The outer circumferential surface of the filter screen 4 is connected to the pool wall of the rinsing tank 2 through an elastic ring. The bottom center of the filter screen 4 is communicated with a discharge conduit 56, and the discharge conduit 56 extends out of the bottom of the rinsing tank 2. A blocking and discharging component 6 is arranged inside the discharge conduit 56.

[0058] Specifically, when the pickling liquid and the quartz sand to be pickled are put into the pickling tank 1 through the feed port for pickling, the output rod of the cylinder part 51 is recovered, which will drive the cylindrical plug 52 to move upward and insert into the pipe opening at the bottom of the pickling tank 1, so as to realize the sealed separation of the pickling tank 1 and the rinsing tank 2, and then the cooperation of the stirring shaft tube 3 and the stirring rod 31 in the pickling tank 1 can accelerate the pickling efficiency of the quartz sand by the pickling liquid in the pickling tank 1. When the pickling of the quartz sand is completed, the output rod of the cylinder part 51 is extended, which will drive the cylindrical plug 52 to slide downward from the bottom pipe opening, so that the pickling tank 1 and the rinsing tank 2 can be connected, and at this time, The amount of pickled sand and pickling liquid entering the rinsing tank 2 after pickling is controlled according to the distance that the cylindrical plug 52 is separated from the bottom pipe mouth. The design of the inclined boss 53 can be that the falling pickled sand can be evenly diverted into the rinsing tank 2, and the output rod of the cylinder 51 extends back and forth, which can drive the multiple rotating stirring rods 55 to reciprocate up and down in the rinsing tank 2, thereby accelerating the spraying and rinsing efficiency of the cleaning liquid sprayed by the multiple groups of spray assemblies 7 on the pickled sand; and after the pickling sand is rinsed, the output rod of the cylinder 51 controls the inclined boss 53 to continue to descend, so that the four circumferentially equidistant push blocks 54 can contact the elastically connected filter screen 4 The surface of the filter screen 4 is pushed by the multiple push blocks 54, so that the center of the filter screen 4 will be depressed downward, and at this time, the blocking discharge assembly 6 in the discharge conduit 56 will be opened, and then the washed quartz sand will be automatically discharged downward through the opened discharge conduit 56 of the center-depressed filter screen 4. At this time, the continued rotation of the inclined boss 53 can not only drive the stirring rod 55 to rotate to scrape and clean the quartz sand on the upper surface of the filter screen 4, but also drive the blocking discharge assembly 6 to rotate synchronously, so that the quartz sand entering the discharge conduit 56 can be quickly discharged, so that the stirring sand discharge mechanism 5 can not only clean the pickling tank 1 and the flushing tank 2 The sealing segmentation is performed to realize accurate pickling of the quartz sand. At the same time, it can also drive multiple stirring rods 55 to rotate in the flushing tank 2 to realize stirring and flushing of the pickled sand. The descending of the push block 54 pushes the filter screen 4, which can make the center of the filter screen 4 concave downward, so that the sealing discharge component 6 is automatically opened, so that the flushed quartz sand can automatically follow the centrally depressed filter screen 4 to flow into the discharge conduit 56 for discharge, dehydration and drying. Therefore, the stirring and sand discharge mechanism 5 can automatically and quickly discharge the flushed quartz sand from the flushing tank 2 for dehydration and drying without affecting the efficient pickling of the quartz sand by the pickling tank 1.

[0059] In this embodiment, the plugging and discharging assembly 6 includes a plug 61. A stepped blanking hole 41 is formed at the center of the filter screen 4, and the upper hole bottom of the stepped blanking hole 41 is in a slope shape. The plug 61 is hermetically inserted into the upper hole opening of the stepped blanking hole 41. A shaft rod 62 is vertically fixed to the lower surface of the plug 61, and the bottom of the shaft rod 62 is connected to the inner wall of the discharge conduit 56 through a bearing and an inclined rod. A spiral blade 64 is sleeved on the shaft rod 62. A square insert block 65 is fixed to the upper surface of the plug 61. A recessed groove 531 is formed at the bottom of the inclined surface boss 53, and a square jack 532 is formed at the top of the groove of the recessed groove 531. The square jack 532 corresponds to the square insert block 65.

[0060] Specifically, when the washed quartz sand accumulates towards the middle of the filter screen 4 under the action of gravity, and when the pushing block 54 continuously moves downward, the pushing block 54 pushes the quartz sand to further press down the filter screen 4, causing the center of the elastically mounted filter screen 4 to sink downward. Since the discharge conduit 56 is in a fixed state and the shaft rod 62 is fixed in the discharge conduit 56, when the stepped blanking hole 41 of the filter screen 4 sinks downward, the plug 61 will be disengaged from the stepped blanking hole 41, thereby connecting the stepped blanking hole 41 and the discharge conduit 56. The washed quartz sand on the filter screen 4 will enter the discharge conduit 56 through the gap between two adjacent pushing blocks 54 and the opened stepped blanking hole 41. As the pushing block 54 continuously moves downward, at this time, the plug 61 will enter the recessed groove 531, and the square insert block 65 at the top of the plug 61 will be inserted into the square jack 532 formed in a square shape (preferably, the square insert block 65 can be threadedly connected to the upper surface of the plug 61. In actual production, when the square insert block 65 is easily covered by the falling quartz sand and affects the cooperation with the square jack 532, the machine can be stopped at this time and the square insert block 65 with a longer length can be replaced). Then, with the slow rotation of the stirring rod 55 driven by the inclined surface boss 53, the plug 61 engaged with the square jack 532 and the square insert block 65 will rotate synchronously. Further, the shaft rod 62 will drive the spiral blade 64 located in the discharge conduit 56 to rotate, so as to convey and discharge the quartz sand falling in the discharge conduit 56, thereby being able to accelerate the discharging effect of the quartz sand from the sunken filter screen 4. Furthermore, the plugging and discharging assembly 6 can not only be automatically opened from the upper hole opening of the stepped blanking hole 41 under the pushing of the plurality of pushing blocks 54 on the filter screen 4, and can accelerate the discharging effect of the quartz sand from the sunken filter screen 4. When the quartz sand on the filter screen 4 is completely discharged, at this time, the pushing block 54 moves upward to disengage from the extrusion and pushing of the filter screen 4, which will cause the center of the filter screen 4 to deform upward and recover. Further, the plug 61 will continue to block the upper hole opening of the stepped blanking hole 41, realizing the plugging of the stepped blanking hole 41, so that the filter screen 4 can continue to wash the pickled sand after pickling, and there will be no phenomenon of leakage of the normal pickled sand in the washing tank 2 during washing.

[0061] In this embodiment, the plugging and discharging assembly 6 further includes an extension disk 57. The extension disk 57 is fixedly arranged at the upper pipe orifice of the discharging conduit 56. The lower surface of the filter screen 4 is fixedly provided with a support disk 66 at the bottom of the stepped blanking hole 41. A double-layer elastic membrane tube 69 is arranged between the upper surfaces of the support disk 66 and the extension disk 57. A plurality of support guide rods 68 are installed on the lower surface of the support disk 66. A plurality of guide sliding sleeves 67 are fixedly arranged on the extension disk 57. Each support guide rod 68 is slidably inserted into a guide sliding sleeve 67. An electromagnetic suction block is insulatingly installed on the inner wall of each guide sliding sleeve 67. Each support guide rod 68 is insulatingly embedded in a metal strip 681, and the metal strip 681 is in corresponding contact with the electromagnetic suction block. Each support guide rod 68 extends out of the bottom of the guide sliding sleeve 67 and is connected with a limiting ring. The plurality of support guide rods 68 are located between the double-layer elastic membrane tubes 69. A spring member is connected between the support disk 66 and the extension disk 57, and the spring member is sleeved on the support guide rod 68;

[0062] Specifically, since the filter screen 4 is elastically installed in the flushing tank 2 through an elastic ring, when the filter screen 4 is in a horizontal state to support and flush the falling quartz sand, at this time, the electromagnetic suction blocks on the inner circumferential surfaces of the plurality of limiting rings are powered on to adsorb and fix the corresponding metal strips 681 in contact therewith, so that the plurality of support guide rods 68 can fixedly support the center of the filter screen 4 through the support disk 66. At this time, the discharging conduit 56 can be rigidly connected with the filter screen 4 through the plurality of fixed support guide rods 68 to fixedly support it, so that the center of the filter screen 4 is in a fixed state to support and filter the continuously falling quartz sand, preventing the phenomenon that the filter screen 4 automatically sags due to the large amount and heavy weight of the falling quartz sand; when the pushing block 54 contacts the filter screen 4 and causes the center of the filter screen 4 to sag, at this time, the electromagnetic suction blocks are powered off and separated from the adsorption and fixation of the metal strips 681. The continuous downward movement of the pushing block 54 will cause the support disk 66 to push the plurality of support guide rods 68 to slide downward in the guide sliding sleeves 67, so that the upper pipe orifice of the discharging conduit 56 is in a flexible connection state with the center of the filter screen 4. Thus, the center of the filter screen 4 can be depressed downward under the push of the pushing block 54 to open and communicate with the discharging conduit 56. The double-layer elastic membrane tube 69 can seal the cavity between the extension disk 57 and the support disk 66, not only enabling the quartz sand to accurately enter the discharging conduit 56, but also preventing the falling acid cleaning solution and flushing wastewater from entering the discharging conduit 56, thereby causing secondary pollution to the rinsed quartz sand.

[0063] In this embodiment, a bevel platform 58 is arranged on the upper top of the plug 61, and the total thickness of the bevel platform 58 and the plug 61 is less than the groove depth of the concave groove 531; specifically, the design of the bevel platform 58 can prevent the quartz sand from accumulating on the upper surface of the plug 61, which affects the accurate entry of the plug 61 into the concave groove 531, thereby affecting the accurate docking of the square plug 65 and the square socket 532.

[0064] In this embodiment, the spraying assembly 7 includes nozzles 71. A plurality of nozzles 71 are installed in a circumferential array on the top of the flushing tank 2. The plurality of nozzles 71 located in the same radial direction are communicated through a liquid guiding pipe 72 at the top, and a connecting flange 73 is provided at the end of the liquid guiding pipe 72. Specifically, the liquid guiding pipe 72 can evenly distribute the flushing liquid into a plurality of nozzles 71, and then spray it into the flushing tank 2 through the plurality of nozzles 71 to flush the pickled sand.

[0065] In this embodiment, a plurality of liquid discharge pipes 8 are communicated at the connection between the inclined bottom of the flushing tank 2 and the discharge conduit 56, and the plurality of liquid discharge pipes 8 are communicated with an annular collection box 9. The annular collection box 9 is located on the outer circumferential surface at the bottom of the flushing tank 2. Specifically, the pickling solution and the flushing wastewater entering the flushing tank 2 are collected through the liquid discharge pipes 8 and the annular collection box 9, and then flow into the pickling solution recovery tank and the wastewater collection tank respectively for collection and treatment.

[0066] In this embodiment, the magnetic separation device is one or more of a high-gradient magnetic separator and an electromagnetic slurry machine, the magnetic field strength is 1.6 - 1.8 T, and the types of acids used in the pickling tank 1 are one or more of hydrofluoric acid, phosphoric acid, nitric acid, sulfuric acid, and hydrochloric acid.

[0067] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0068] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A purification process for preparing 5N2 grade high-purity quartz sand from quartz ore, characterized in that, The process includes the following steps: Step S1: Coarsely crush and screen the raw ore sample to obtain intermediate products with a particle size of 0.5 - 3 cm and fine-grained product 1. Wash the intermediate particle size products to remove slime, and then use a color sorter for color sorting to obtain quartz rough materials and waste materials; Step S2: Place the quartz rough materials obtained in Step S1 in a calcination furnace for calcination at 800 - 1000 °C, and the calcination time is 15 - 30 min. Then quickly take it out and pour it into cold water for water quenching treatment to obtain quartz clinker; Step S3: Carry out sand making and classification on the quartz clinker obtained in Step S2 to obtain quartz raw sand of intermediate particle size and fine-grained products; Put the obtained quartz raw sand into a magnetic separation device for magnetic separation operation to obtain magnetic products and non-magnetic products; Step S4: Put the non-magnetic products obtained by magnetic separation in Step S3 into a pickling tank for full hydrochloric acid pickling. After pickling, the pickled sand falls into a flushing pool for flushing to obtain pickled sand; Step S5: Pulp the pickled products obtained in Step S4, and successively add inhibitors, regulators, activators and collectors for flotation to obtain flotation concentrate; Step S6: Dehydrate the flotation concentrate obtained in Step S5, and then carry out high-temperature sand roasting. The sand roasting temperature is 700 - 1100 °C, and the sand roasting time is 5 - 15 minutes. Then put the dried and washed sand into a high-temperature chlorination furnace for chlorination reaction. The high-temperature chlorination temperature is 1000 - 1200 °C to obtain high-purity quartz sand; Among them, the bottom of the pickling tank is connected to a flushing pool, the top of the pickling tank is connected to multiple feed ports, and a stirring shaft tube is installed in the pickling tank. Multiple stirring rods are connected and installed on the stirring shaft tube. A filter screen is installed in the flushing pool, and a stirring and sand discharging mechanism is arranged on the filter screen. Multiple groups of spraying components are installed on the top of the flushing pool.

2. The purification process for preparing 5N2 grade high-purity quartz sand from quartz ore according to claim 1, characterized in that, The stirring and sand discharging mechanism includes a cylinder part. The bottom of the stirring shaft tube extends above the bottom of the pickling tank. The cylinder part is fixedly arranged inside the bottom of the stirring shaft tube, and the bottom of the output rod of the cylinder part is connected with a cylindrical plug; The diameter of the cylindrical plug is the same as the inner diameter of the bottom pipe orifice of the pickling tank. The bottom of the cylindrical plug is connected with an inclined surface boss, and multiple pushing blocks are installed in a circumferential array at the bottom of the inclined surface boss. The bottom side of each pushing block is connected with a stirring rod; The outer circumferential surface of the filter screen is connected to the pool wall of the flushing pool through an elastic ring. The bottom of the center of the filter screen is connected with a discharge conduit, and the discharge conduit extends out of the bottom of the flushing pool. A plugging and discharging component is arranged inside the discharge conduit.

3. The purification process for preparing 5N2 grade high-purity quartz sand from quartz ore according to claim 2, characterized in that, The plugging and discharging component includes a plug. A stepped blanking hole is opened at the center of the filter screen, and the upper hole bottom of the stepped blanking hole is in a slope shape. The plug is hermetically inserted into the upper hole orifice of the stepped blanking hole; A shaft rod is vertically fixed on the lower surface of the plug, and the bottom of the shaft rod is connected to the inner wall of the discharge conduit through a bearing and an inclined rod. A spiral blade is sleeved on the shaft rod; A square insertion block is fixed on the upper surface of the plug. A concave groove is opened at the bottom of the inclined surface boss, and a square insertion hole is opened at the top of the concave groove. The square insertion hole corresponds to the square insertion block.

4. The purification process for preparing 5N2 grade high-purity quartz sand from quartz ore according to claim 3, characterized in that, The plugging and discharging assembly further includes an extension disk, which is fixedly arranged at the upper pipe orifice of the discharging conduit. A support disk is fixedly arranged at the bottom surface of the filter screen at the bottom of the stepped blanking hole. A double-layer elastic membrane tube is arranged between the upper surfaces of the support disk and the extension disk. A plurality of support guide rods are installed on the bottom surface of the support disk. A plurality of guiding sliding sleeves are fixedly arranged on the extension disk. Each support guide rod is slidably inserted into each guiding sliding sleeve. An electromagnetic suction block is insulatingly installed on the inner wall of each guiding sliding sleeve. Each support guide rod is insulatingly embedded in a metal strip, and the metal strip is in corresponding contact with the electromagnetic suction block. Each support guide rod extends out of the bottom of the guiding sliding sleeve and is connected with a limiting ring. The plurality of support guide rods are located between the double-layer elastic membrane tube. A spring member is connected between the support disk and the extension disk, and the spring member is sleeved on the support guide rod.

5. The purification process for preparing 5N2 grade high-purity quartz sand from quartz ore according to claim 3, characterized in that, The upper top of the plug has an inclined surface convex platform, and the total thickness of the inclined surface convex platform and the plug is less than the groove depth of the concave groove.

6. The purification process for preparing 5N2 grade high-purity quartz sand from quartz ore according to claim 1, characterized in that, The spraying assembly includes nozzles. A plurality of nozzles are installed in a circumferential array on the top of the flushing tank. A plurality of nozzles located in the same radial direction are communicated through a liquid guiding pipe at the top, and a connecting flange is arranged at the end of the liquid guiding pipe.

7. The purification process for preparing 5N2 grade high-purity quartz sand from quartz ore according to claim 6, characterized in that, A plurality of liquid discharging conduits are communicated at the connection part between the inclined bottom of the flushing tank and the discharging pipe, and the plurality of liquid discharging conduits are communicated with an annular collecting box, and the annular collecting box is located on the outer circumferential surface at the bottom of the flushing tank.

8. The purification process for preparing 5N2 grade high-purity quartz sand from quartz ore according to claim 1, characterized in that, The magnetic separation device is one or more of a high-gradient magnetic separator and an electromagnetic slurry machine, the magnetic field intensity is 1.6 - 1.8T, and the types of acids used in the pickling tank are one or more of hydrofluoric acid, phosphoric acid, nitric acid, sulfuric acid, and hydrochloric acid.

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