A wet preparation method and production line for high-purity quartz sand

Abstract

The present invention provides a wet preparation method and production line for high-purity quartz sand. The preparation method and production line include coarse crushing-screening treatment, fine crushing-screening treatment, magnetic separation treatment, scrubbing treatment, flotation treatment, gravity separation, and dehydration treatment. Through the above links, an automated continuous production line can be connected in series, realizing the continuous and high-efficiency production of quartz sand without interruption. At the same time, in each link of the fine crushing-screening treatment, magnetic separation treatment, scrubbing treatment, flotation treatment, and gravity separation of the present application, it is carried out in a mortar state, which belongs to wet sand making. In this way, the energy consumption of sand making is reduced and environmental pollution is decreased. In addition, the mortar concentration is controlled in each link of wet sand making in the present application to ensure the treatment effect of each link. Through multi-stage magnetic separation, multi-stage flotation, and gravity separation links, the impurity content of quartz sand can be less than 50 ppm, and further, the impurity content can be less than 30 ppm.

Description

Technical Field

[0001] Embodiments of the present disclosure generally relate to the technical field of non-metallic ore beneficiation and processing, and more specifically, to a wet preparation method and production line for high-purity quartz sand. Background Art

[0002] High-purity quartz sand refers to a high-purity non-metallic mineral raw material with a certain particle size specification produced by subjecting natural quartz minerals to a series of physical and chemical purification techniques. Harben (2002) classified processed quartz according to the total amount of impurities in commercial quartz products. In the classification scheme of Harben (2002), quartz with a total amount of impurity elements less than 50 μg / g was defined as high-grade quartz materials, including high-purity quartz (total amount of impurity elements: 8 - 50 μg / g), ultra-high-purity quartz (total amount of impurity elements: 1 - 8 μg / g), and hyper-purity quartz (total amount of impurity elements < 1 μg / g). Among them, the latter is scarce or non-existent in nature and needs to be artificially synthesized.

[0003] High-purity quartz sand is the main raw material for producing high-purity quartz glass tubes / rods / plates / blocks, quartz glass crucibles, and optical quartz glass. Quartz glass is widely used in high-end electric light sources, large-scale and ultra-large-scale integrated circuits, solar cells, optical fibers, lasers, aerospace, military and other industries due to its excellent physical and chemical properties.

[0004] The raw ore of high-purity quartz sand is natural quartz ore. In addition to quartz, quartz ore usually contains various impurity minerals. Common impurity minerals include mica, feldspar, epidote, and iron-bearing minerals, etc. Extracting quartz minerals from the ore and separating other impurity minerals is the key process for producing high-purity quartz sand.

[0005] In the prior art in China, the production of high-purity quartz sand usually adopts dry sand-making technology, that is, quartz ore is calcined at a temperature above 900 °C for several hours, then the hot ore is put into cold water for water quenching, and then fished out from the water, dried, and then subjected to dry crushing and screening. However, this dry sand-making technology has high energy consumption and serious dust pollution. In addition, the magnetic separation and flotation processes in the prior art have poor effects on separating impurity minerals; and the prior art cannot be continuously produced and has low efficiency, which is also an important aspect for the long-term backwardness of China's high-purity quartz sand production technology compared with the international advanced level.

[0006] Therefore, how to design a new sand-making method with low energy consumption, less pollution, continuous production, high efficiency, and high purity has become an urgent problem to be solved at present. Summary of the Invention

[0007] The present invention aims to solve one or more of the above-mentioned problems.

[0008] To solve the above problems, a wet preparation method of high-purity quartz sand is proposed in the first aspect of the present invention.

[0009] A wet production line for high-purity quartz sand is proposed in the second aspect of the present invention.

[0010] The technical solution of the first aspect of the present invention proposes a wet preparation method of high-purity quartz sand, and the preparation method includes the following steps:

[0011] Perform coarse crushing on the original ore, and screen out the ore fragments less than or equal to the preset size after the coarse crushing;

[0012] Mix the screened ore fragments with water and then perform fine crushing, and screen the mixture after the fine crushing to screen out the quartz sand mortar less than or equal to the upper limit of the required particle size;

[0013] Remove mechanical iron and iron-containing minerals in the quartz sand mortar through magnetic separation;

[0014] Scrub the magnetically separated quartz sand mortar, and then perform multi-stage flotation on the scrubbed quartz sand mortar to remove impurity minerals in the quartz sand mortar;

[0015] Use gravity separation technology to perform gravity separation on the quartz sand mortar after flotation treatment to remove heavy minerals in the quartz sand mortar;

[0016] Screen the quartz sand mortar after gravity separation treatment to remove the quartz sand less than the lower limit of the required particle size in the quartz sand mortar;

[0017] After removing the quartz sand less than the lower limit of the required particle size in the quartz sand mortar, perform dehydration treatment on the quartz sand mortar to prepare the quartz sand of the required specification.

[0018] On the basis of the above solution, preferably, the wet preparation method of high-purity quartz sand further includes: pickling the prepared quartz sand of the required specification, and the steps of pickling include: preparing a pickling solution, soaking the prepared quartz sand of the required specification in the pickling solution for pickling, filtering out the pickled quartz sand, washing and drying the filtered quartz sand. In this step, washing is to wash away substances such as acid radical ions remaining in the pickling process. Preferably, the pickling solution is a hydrogen fluoride solution. Of course, the pickling solution can also be any one or any combination of mixed solutions such as ammonium hydrogen fluoride, hydrochloric acid, sulfuric acid, nitric acid, etc. The hydrogen fluoride solution is hydrofluoric acid, and its concentration range is 5%-40%. When the quartz sand and the hydrofluoric acid solution are sealed and soaked, the soaking temperature is 40°C-120°C, and the soaking time is 2h-5h.

[0019] Based on the above solutions, preferably, during one or more of the processes of magnetic separation treatment, scrubbing treatment, multi-stage flotation treatment, and gravity separation, the mortar concentration of the quartz mortar is detected, and the mortar concentration of the quartz mortar is controlled within the range of the preset concentration requirements. Meanwhile, during multi-stage flotation treatment, targeted flotation reagents can be selected according to the impurities to be removed in each stage of flotation, and the impurity minerals are separated out in sequence.

[0020] Furthermore, during the processes of magnetic separation treatment, multi-stage flotation treatment, and gravity separation, the mortar concentration is controlled within the range of greater than 0 and less than or equal to 30%.

[0021] Furthermore, during the scrubbing treatment process, the mortar concentration is controlled within the range of greater than 70%.

[0022] Based on the above solutions, preferably, the steps of performing coarse crushing treatment on the original ore and screening out the ore fragments less than or equal to the preset size after the coarse crushing treatment specifically include:

[0023] Performing the first coarse crushing on the original ore through a jaw crusher, and performing the second coarse crushing on the original ore after the first coarse crushing through a cone crusher;

[0024] Screening out the ore fragments less than or equal to the preset size through the first screening device.

[0025] Based on the above solutions, preferably, the steps of mixing the screened ore fragments with water for fine crushing treatment and screening the mixture after the fine crushing treatment to screen out the quartz mortar less than or equal to the upper limit of the required particle size include:

[0026] Transporting the ore fragments screened out by the first screening device to a feeding control machine, and feeding the ore fragments into the bin of a rod mill through the feeding control machine;

[0027] Adding water to the bin of the rod mill, and performing fine crushing treatment on the ore fragments in the bin through the rod mill. Screening the mixture after the fine crushing treatment through the second screening device to screen out the quartz mortar less than or equal to the upper limit of the required particle size.

[0028] Based on any of the above technical solutions, preferably, before the coarse crushing treatment, it further includes: shoveling the ore raw material into the bin of a vibrating feeder, and then feeding the vibrating feeder to the coarse crusher.

[0029] Based on the above solutions, preferably, in the magnetic separation treatment, multiple magnetic separators are used for magnetic separation treatment. In this way, multiple wet magnetic separation treatments can be realized.

[0030] On the basis of the above solution, preferably, when dehydrating the quartz mortar with a particle size smaller than the lower limit of the required particle size, dehydration is carried out by a centrifuge or a belt filter. Preferably, the belt filter is a vacuum belt filter for dehydration.

[0031] On the basis of any of the above technical solutions, preferably, the particle size of the prepared quartz sand is less than or equal to 1 mm, and the impurity content of the prepared quartz sand is less than or equal to 50 ppm.

[0032] In any of the above technical solutions, preferably, the step of performing multi-stage flotation treatment on the scrubbed quartz mortar specifically includes: performing one or more of the following flotation operations on the scrubbed quartz mortar: feldspar mineral flotation, mica mineral flotation, rutile mineral flotation, iron or iron-containing mineral flotation, epidote mineral flotation, tremolite mineral flotation, and actinolite mineral flotation.

[0033] In any of the above technical solutions, preferably, when performing any kind of mineral flotation on the scrubbed quartz mortar, multi-stage continuous flotation is carried out 1-4 times. And each time flotation is carried out, the flotation reagents include one of alkylamine salt cationic collectors, petroleum sulfonate anion collectors, and salicylhydroxamic acid, 2-ethyl ethanol or pine oil used as a foaming agent with a dosage of 5-50 g / t, and hydrofluoric acid and / or sulfuric acid used to adjust the acidity and alkalinity. Among them, each time flotation is carried out, the pH value of the quartz mortar needs to be controlled between 2-6.

[0034] In any of the above technical solutions, preferably, the steps of performing multiple flotation on the scrubbed quartz mortar include: determining a flotation plan, determining the number of required flotation units according to the flotation plan, connecting the required flotation units in series in sequence, and connecting the series-connected multiple flotation units to the corresponding positions; putting the required flotation reagents into the pulp mixing tank of each flotation unit and performing pulp mixing; after the pulp mixing is completed, making the scrubbed quartz mortar pass through each flotation unit in sequence to achieve multi-stage flotation.

[0035] Specifically, when performing feldspar mineral flotation on the scrubbed quartz mortar, multi-stage continuous flotation is carried out 1-4 times. Among them, each time flotation is carried out, the collector uses an alkylamine salt cationic collector with a dosage of 100-500 g / t, the foaming agent uses 2-ethyl ethanol or pine oil with a dosage of 5-50 g / t, and at the same time, the acidity and alkalinity of the quartz mortar are adjusted with hydrofluoric acid, and the pH value of the quartz mortar is controlled between 2-6.

[0036] When performing mica mineral flotation on the scrubbed quartz mortar, multi-stage continuous flotation is carried out 1-4 times. Among them, during each flotation, the collector uses an alkylamine salt cationic collector with a dosage of 100-500 g / t, the foaming agent uses 2-ethyl ethanol or pine oil with a dosage of 5-50 g / t. At the same time, sulfuric acid is used to adjust the pH value of the quartz mortar, and the pH value of the quartz mortar is controlled between 2-6.

[0037] When performing iron or iron-containing mineral flotation on the scrubbed quartz mortar, multi-stage continuous flotation is carried out 1-4 times. Among them, during each flotation, the collector uses a sodium petroleum sulfonate anionic collector with a dosage of 150-750 g / t, the foaming agent uses 2-ethyl ethanol or pine oil with a dosage of 5-50 g / t. At the same time, sulfuric acid is used to adjust the pH value of the quartz mortar, and the pH value of the quartz mortar is controlled between 2-6;

[0038] When performing rutile mineral flotation on the scrubbed quartz mortar, multi-stage continuous flotation is carried out 1-3 times. Salicylhydroxamic acid is used as the collector with a dosage of 30-90 g / t, and the foaming agent uses 2-ethyl ethanol or pine oil with a dosage of 5-50 g / t. At the same time, sulfuric acid is used to adjust the pH value of the quartz mortar, and the pH value of the quartz mortar is controlled between 2-6.

[0039] The technical solution of the second aspect of the present invention provides a wet preparation production line for high-purity quartz sand, and this production line includes:

[0040] A coarse crushing unit, which includes a coarse crusher and a first screening device communicated with the coarse crusher;

[0041] A rod mill unit, including a rod mill and a second screening device. The rod mill is communicated with the first screening device, and the second screening device is connected to the discharge port of the rod mill;

[0042] A magnetic separation unit, which is connected to the discharge port of the second screening device and is used for magnetic separation treatment of the quartz mortar;

[0043] A scrubber, which is connected to the discharge port of the magnetic separation unit and is used for scrubbing the quartz mortar after magnetic separation;

[0044] A flotation unit, including a plurality of flotation units that can be connected in series. Each flotation unit includes a flotation machine and a pulp conditioning tank connected in series, and the pulp conditioning tank of each flotation unit is arranged in front of the flotation machine. The inlet of the pulp conditioning tank at the front end of the flotation unit is connected to the scrubber, and the outlet of the flotation machine of each flotation unit can be detachably connected to a gravity separation device;

[0045] A third screening device and the gravity separation device, the gravity separation device being used for gravity-separating the quartz mortar after flotation treatment to remove heavy minerals in the quartz mortar, and the outlet of the gravity separation device being provided with the third screening device, the third screening device being used for removing quartz sand smaller than the lower limit of the required particle size in the quartz mortar;

[0046] A dehydration treatment device, connected to the third screening device, for dehydrating the quartz mortar screened by the third screening device to prepare quartz sand of the required specification;

[0047] Wherein, a concentration control device is provided corresponding to one or more of the rod mill unit, the magnetic separation unit, the scrubber, the flotation unit and the gravity separation device, and the concentration control device includes a concentration detection device and a water supply control device connected to the concentration detection device.

[0048] Further preferably, the wet preparation production line of high-purity quartz sand further includes: a feeding control machine, arranged at the inlet of the rod mill, for feeding materials to the rod mill.

[0049] Further preferably, the wet preparation production line of high-purity quartz sand further includes a packaging unit, connected to the dehydration treatment device, for packaging the prepared quartz sand.

[0050] Further preferably, the wet preparation production line of high-purity quartz sand further includes an acid pickling device, the acid pickling device being used for acid pickling the prepared quartz sand.

[0051] Further preferably, the magnetic separation unit includes multiple wet magnetic separators, and the multiple wet magnetic separators are connected by a material pumping device or connected by a head difference.

[0052] Further preferably, the gravity separation device includes one or two of a shaking table or a spiral chute.

[0053] Further preferably, the dehydration treatment device is a high-speed centrifugal dehydrator or a belt filter.

[0054] Further preferably, the first screening device, the second screening device and the third screening device are all wet screening devices.

[0055] Further preferably, the coarse crusher includes a jaw crusher and a cone crusher, and the jaw crusher, the cone crusher and the first screening device are sequentially connected by a belt conveyor.

[0056] Further preferably, the slurry mixing tank is a cylindrical slurry mixing tank, the inner wall of the cylindrical slurry mixing tank is provided with a corrosion-resistant lining material, and the inner wall of the flotation machine is provided with a corrosion-resistant lining material.

[0057] Further preferably, the flotation reagents used in the plurality of flotation units include a variety of collectors applicable to a variety of impurity minerals, such as alkylamine salt cationic collectors, sodium petroleum sulfonate anionic collectors or salicylhydroxamic acid.

[0058] Further preferably, a rubber layer is provided on the inner wall of the scrubber.

[0059] Further preferably, the rod mill unit, the magnetic separation unit, the scrubber, the flotation unit and the gravity separation device are sequentially connected by a material pumping device.

[0060] Further preferably, the wet production line for high-purity quartz sand further includes: a pickling device for pickling, washing and drying the prepared quartz sand of the required specifications.

[0061] Beneficial effects: In view of the backward situation of high-purity quartz sand production in China, the present invention has invented new technologies and new processes for wet sand making, multi-stage magnetic separation, multi-stage flotation, and large-batch continuous production. Specifically: According to the wet preparation method of high-purity quartz sand provided by the present invention, it includes processes such as coarse crushing - screening, fine crushing - screening, magnetic separation, scrubbing, flotation, gravity separation, and dehydration treatment. Specifically, the coarse crushing - screening process consists of a jaw crusher, a cone crusher, and a first screening device. In this process section, large ore blocks are crushed into small stones. The fine crushing - screening process consists of a rod mill and a second screening device. Its main function is to crush small stones into quartz sand grains, and then screen them into quartz sands of different specifications through the second screening device. The magnetic separation process consists of multiple magnetic separation machines. Its main function is to remove mechanical iron and iron-containing minerals in the quartz sand. The scrubbing process is to use scrubbing equipment to remove the adhering impurities on the surface of quartz sand particles, and to round the outer contour of the particles to improve the physical and chemical properties of the particles. The flotation process consists of multiple pulp conditioning tanks and flotation machines connected in series to form a continuous flotation production line adaptable to different ore types. According to the types and contents of impurity minerals in the ore, various combinations of equipment can be used. For example, when the impurity minerals are relatively single, the number of pulp conditioning tanks and flotation machines can be reduced to float out qualified products. The gravity separation process is to use equipment such as a shaking table or a spiral chute to remove heavy minerals in the quartz sand. The dehydration - packaging process consists of a high-speed centrifugal dehydrator or a belt filter. According to the requirements of subsequent processing, these two types of equipment are respectively selected to remove most of the water in the quartz sand. And through these above-mentioned processes, an automated continuous production line can be connected in series. This automated continuous production line can input large ore blocks at the starting end of the production line and produce quartz sand with a particle size less than 1 mm at the dehydration end. It can continuously carry out flow operations, realizing the continuous and highly efficient production of quartz sand. Moreover, through magnetic separation, flotation treatment, and gravity separation, most of the impurities in the quartz sand can be separated out by this preparation method, and the SiO2 content of the prepared quartz sand can be as high as more than 99.995%, that is, the impurity content is less than 50 ppm. In this way, the purity of the quartz sand is ensured. At the same time, for the wet preparation method and wet preparation production line of high-purity quartz sand provided in this application, due to the use of wet sand making, compared with the existing dry sand making, its energy consumption is low and there is basically no dust pollution. In this way, the energy consumption of sand making is reduced, and the environmental pollution during the sand making process is reduced.

[0062] It should be understood that the content described in the disclosure part is not intended to limit the key or important features of the embodiments of the present invention, nor to limit the scope of the present invention. Other features of the present invention will become easily understandable through the following description. Brief Description of the Drawings

[0063] In conjunction with the accompanying drawings and with reference to the following detailed description, the above and other features, advantages, and aspects of the embodiments of the present disclosure will become more apparent. In the drawings, the same or similar reference numerals denote the same or similar elements, where:

[0064] Figure 1 shows a schematic flow chart of a wet method for preparing high-purity quartz sand provided by an embodiment of the present disclosure;

[0065] Figure 2 shows a schematic flow chart of a wet method for preparing high-purity quartz sand provided by another embodiment of the present disclosure;

[0066] Figure 3 shows Figure 1 and Figure 2 a specific flow chart of S102 in

[0067] Figure 4 shows Figure 1 and Figure 2 a specific flow chart of S104 in

[0068] Figure 5 shows a schematic flow chart of a wet method for preparing high-purity quartz sand provided by yet another embodiment of the present disclosure;

[0069] Figure 6 shows Figure 1 , Figure 2 and Figure 5 a specific flow chart of S108 in

[0070] Figure 7 shows a schematic flow chart of a wet method for preparing high-purity quartz sand provided by still another embodiment of the present disclosure;

[0071] Figure 8 shows a process diagram of a wet production line for preparing high-purity quartz sand provided by a specific embodiment of the present disclosure. Detailed Embodiments

[0072] To make the objectives, embodiments, and advantages of the embodiments of the present disclosure clearer, the embodiments in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0073] As Figure 1 shown, a wet method for preparing high-purity quartz sand proposed by an embodiment of the first aspect of the present invention includes the following steps:

[0074] S102, perform coarse crushing on the raw ore, and screen out the ore fragments smaller than or equal to the preset size after the coarse crushing;

[0075] S104, mix the screened ore fragments with water and then perform fine crushing, and screen the mixture after the fine crushing to screen out the quartz mortar smaller than or equal to the upper limit of the required particle size;

[0076] S106, remove mechanical iron and iron-containing minerals in the quartz mortar through magnetic separation;

[0077] S108, perform scrubbing on the quartz mortar after magnetic separation, and then perform multi-stage flotation on the scrubbed quartz mortar to remove the impurity minerals in the quartz mortar;

[0078] S110, perform gravity separation on the quartz mortar after flotation using the gravity separation process to remove the heavy minerals in the quartz mortar;

[0079] S112, screen the quartz mortar after gravity separation to remove the quartz sand smaller than the lower limit of the required particle size in the quartz mortar;

[0080] S114, after removing the quartz sand smaller than the lower limit of the required particle size in the quartz mortar, perform dehydration on the quartz mortar to prepare the quartz sand of the required specification.

[0081] According to the wet preparation method of high-purity quartz sand provided by the present invention, it includes processes such as coarse crushing-screening treatment, fine crushing-screening treatment, magnetic separation treatment, scrubbing treatment, flotation treatment, gravity separation, and dehydration treatment. Specifically, the coarse crushing-screening treatment consists of a jaw crusher, a cone crusher, and a first screening device. In this section, large ore pieces are crushed into small stones. The fine crushing-screening treatment consists of a rod mill and a second screening device. Its main function is to crush small stones into quartz sand grains, and then screen them into quartz sands of different specifications through the second screening device. The magnetic separation treatment consists of multiple magnetic separation machines. Its main function is to remove mechanical iron and iron-containing minerals in the quartz sand. The scrubbing treatment is to use scrubbing equipment to remove the adhering impurities on the surface of quartz sand particles, and to round the outer contour of the particles to improve the physical and chemical properties of the particles. The flotation treatment consists of multiple slurry mixing tanks and flotation machines connected in series to form a continuous flotation production line adaptable to different ore types. According to the types and contents of impurity minerals in the ore, various equipment combinations can be used. For example, when the impurity minerals are relatively single, the number of slurry mixing tanks and flotation machines can be reduced to float out qualified products. The gravity separation treatment is to use equipment such as a shaking table or a spiral chute to remove heavy minerals in the quartz sand. The dehydration treatment consists of a high-speed centrifugal dehydrator or a belt filter. According to the requirements of subsequent treatment, these two types of equipment are respectively selected to remove most of the water in the quartz sand. And through these above-mentioned processes, an automated continuous production line can be connected in series. This automated continuous production line can input large ore pieces from the starting end of the production line and produce quartz sand with a particle size less than 1 mm at the dehydration end. It can continuously carry out flow operation, realizing the continuous and high-efficiency production of quartz sand. And this preparation method can separate most of the impurities in the quartz sand through magnetic separation, flotation treatment, and gravity separation, enabling the prepared SiO2 content to be as high as over 99.995%, that is, the impurity content is less than 50 ppm, thus ensuring the purity of the quartz sand. At the same time, for the wet preparation method and wet preparation production line of high-purity quartz sand provided in this application, due to the use of wet sand making, compared with the existing dry sand making, its energy consumption is low and there is basically no dust pollution, thus reducing the energy consumption of sand making and reducing the environmental pollution during the sand making process.

[0082] Among them, in order to reduce the impurity content and improve the purity of the quartz sand, the size of the original ore is preferably less than 400 mm. Of course, it is also possible if the size of the original ore is slightly larger. And the ore fragments screened out after the coarse crushing treatment are preferably less than or equal to 30 mm. At the same time, the quartz sand particles after fine crushing are preferably less than 2 mm or about 2 mm. And the size of the quartz sand particles after fine crushing can be reasonably set according to the actual purity of the quartz sand.

[0083] Among them, when performing flotation treatment on the scrubbed quartz mortar, it includes multi-stage flotation treatment, and each stage of flotation treatment can include one or more flotation treatments. Through multi-stage flotation, different minerals can be removed. For different minerals, such as feldspar and mica, collectors with different formulation schemes and different flotation machines can be used. The number of flotation stages and the number of flotation times each time can be set according to the types and amounts of impurities in the raw ore. For example, minerals with difficult flotation can be subjected to multiple flotation treatments. Specifically, the flotation process uses multiple pulp mixing tanks and flotation machines in series to form a continuous flotation production line adaptable to different ore types. According to the types and contents of impurity minerals in the ore, various equipment combinations can be used. For example, when the impurity minerals are relatively single, the number of pulp mixing tanks and flotation machines can be reduced to float out qualified products.

[0084] On the basis of the above solution, preferably, the wet preparation method of high-purity quartz sand further includes: during one or more of magnetic separation treatment, scrubbing treatment, multi-stage flotation treatment, and gravity separation, detecting the mortar concentration of the quartz mortar and controlling the mortar concentration of the quartz mortar within the range of preset concentration requirements.

[0085] By detecting the concentration of the mortar, the mortar concentration in each link can be accurately controlled, thereby ensuring the treatment effect of each link, and thus ensuring the magnetic separation effect, scrubbing treatment effect, multi-stage flotation effect, gravity separation effect, etc.

[0086] Furthermore, during magnetic separation treatment, multi-stage flotation treatment, and gravity separation, the mortar concentration is controlled within the range of greater than 0 and less than or equal to 30%.

[0087] Furthermore, during the scrubbing treatment, the mortar concentration is controlled within the range of greater than 70%.

[0088] On the basis of the above solution, preferably, as Figure 2 shown, before the crushing and screening treatment, it further includes:

[0089] S100, shoveling the ore raw materials into the bin of the vibrating feeder, and then feeding the coarse crusher through the vibrating feeder. This method can achieve the gradual addition of ore raw materials, avoid the accumulation of ore raw materials, and thus ensure the crushing effect.

[0090] On the basis of the above solution, preferably, as Figure 3 shown, the step of performing coarse crushing treatment on the original ore and screening out the ore fragments smaller than or equal to the preset size after the coarse crushing treatment, that is, S102 specifically includes:

[0091] S1022, performing the first coarse crushing on the original ore through a jaw crusher, and performing the second coarse crushing on the original ore after the first coarse crushing through a cone crusher;

[0092] S1024, screen out ore fragments smaller than or equal to a preset size through a first screening device.

[0093] Further, as Figure 4 shown, the steps of mixing the screened ore fragments with water, performing fine crushing on the mixture after fine crushing, and screening the mixture after fine crushing to screen out quartz mortar smaller than or equal to the upper limit of the required particle size, that is, S104 specifically includes:

[0094] S1042, convey the ore fragments screened by the first screening device to a feed control machine, and feed the ore fragments into the bin of a rod mill through the feed control machine;

[0095] S1044, add water to the bin of the rod mill, perform fine crushing on the ore fragments in the bin through the rod mill, and screen the mixture after fine crushing through a second screening device to screen out quartz mortar smaller than or equal to the upper limit of the required particle size.

[0096] In this embodiment, coarse crushing can be first performed by a jaw crusher and a cone crusher to break large ore into small stones. After coarse crushing, screened crushed stones of suitable size can be screened out by a screening device, and then the screened crushed stones of suitable size can be conveyed to a feed control machine through a belt conveyor or the like, and then fed into a rod mill through the feed control machine. Thereafter, fine crushing can be performed by the rod mill to break the small stones into quartz sand grains. In this way, qualified quartz mortar can be prepared through these three processes of coarse crushing, screening, and fine crushing. This crushing method uses different levels of crushing methods, which can not only directly process larger ore, so there is no need to pre-crush the ore in advance, but also ensure that the particles of the prepared mortar are finer, thus meeting the sand grain requirements of subsequent preparation processes.

[0097] On the basis of the above solution, preferably, in the magnetic separation treatment, multiple wet magnetic separators are used for magnetic separation treatment. This kind of magnetic separation belongs to multiple wet magnetic separation treatments, and through multiple wet magnetic separation treatments, mechanical iron and iron-containing minerals can be filtered multiple times, thereby minimizing the content of mechanical iron and iron-containing minerals in the prepared quartz sand to ultimately reduce the impurity content in the quartz sand.

[0098] On the basis of the above solution, preferably, when performing multi-stage flotation treatment on the scrubbed quartz mortar, alkylamine salt cationic collectors and / or petroleum sulfonate anion collectors are used to remove impurity minerals.

[0099] On the basis of the above solution, preferably, when dehydrating the quartz mortar after removing particles smaller than the lower limit of the required particle size, dehydration is performed by a centrifuge or a belt filter.

[0100] Based on any of the above embodiments, preferably, the particle size of the prepared quartz sand is less than or equal to 1 mm. Further, the impurity content of the prepared quartz sand is less than or equal to 50 ppm. Still further, the impurity content of the prepared quartz sand is less than or equal to 30 ppm.

[0101] Based on the above solution, preferably, as Figure 5 shown, the wet preparation method of high-purity quartz sand includes an acid pickling step S116 and a packaging step S118. Among them, the packaging step S118 packages the quartz sand. The acid pickling step S116 is specifically as follows:

[0102] Prepare a hydrofluoric acid solution, soak the prepared quartz sand of the required specification in the hydrofluoric acid solution for acid pickling, filter out the acid-pickled quartz sand, wash the filtered quartz sand with water until it is neutral, and then dry it for standby (the drying temperature is approximately around 120 °C). In this step, rinsing with water is to wash away the fluorides remaining in the acid pickling process. When performing acid pickling, the hydrofluoric acid solution is an aqueous solution of hydrofluoric acid, and its concentration range is 5%-40%. And when the quartz sand and the hydrofluoric acid solution are placed in a sealed tank, that is, sealed and soaked in a reaction kettle, the soaking temperature is 40 °C - 120 °C, and the soaking time is 2 h - 5 h. In another embodiment, ammonium bifluoride solution can also be used for acid pickling. In this step, the acid pickling step is mainly to remove some metal oxides and silicate minerals soluble in acid.

[0103] In another embodiment, as Figure 5 shown, after the step of dehydrating the quartz sand slurry with a particle size smaller than the lower limit of the required particle size to prepare the quartz sand of the required specification, acid pickling treatment may not be carried out, and instead, it can be directly packaged.

[0104] In any of the above technical solutions, preferably, as Figure 6 shown, step S108 includes:

[0105] S1082, perform a scrubbing treatment on the magnetic-separated quartz sand slurry;

[0106] Perform a multi-stage flotation treatment on the scrubbed quartz sand slurry to remove the impurity minerals in the quartz sand slurry. Among them, the step of performing a multi-stage flotation treatment on the scrubbed quartz sand slurry specifically includes:

[0107] S1084, determine the flotation scheme, determine the number of required flotation units according to the flotation scheme, connect the required flotation units in series in sequence, and connect the series-connected multiple flotation units to the corresponding positions. When connecting, connect the pulp conditioning tank of the first-stage flotation unit to the previous process, and connect the flotation machine of the last-stage flotation unit of the required flotation units to the next process through a connecting pipe, etc.

[0108] S1086, put the required flotation reagents into the pulp mixing tanks of each flotation unit and carry out pulp mixing. After the pulp mixing is completed, let the scrubbed quartz sand slurry pass through each flotation unit in sequence to achieve multi-stage flotation.

[0109] In any of the above technical solutions, preferably, the step of performing multi-stage flotation treatment on the scrubbed quartz sand slurry specifically includes: performing one or more of the following flotations on the scrubbed quartz sand slurry: feldspar mineral flotation, mica mineral flotation, rutile mineral flotation, iron or iron-containing mineral flotation, epidote mineral flotation, tremolite mineral flotation, and actinolite mineral flotation.

[0110] In any of the above technical solutions, preferably, when performing any kind of mineral flotation on the scrubbed quartz sand slurry, multi-stage continuous flotation is carried out 1-4 times. And each time of flotation, the flotation reagents include one of alkylamine salt cationic collectors, petroleum sulfonate anion collectors, and salicylhydroxamic acid, 2-ethyl ethanol or pine oil used as a foaming agent with a dosage of 5-50 g / t, and hydrofluoric acid and / or sulfuric acid used to adjust the pH value. Among them, each time of flotation, the pH value of the quartz sand slurry needs to be controlled between 2 and 6.

[0111] Specifically, when performing feldspar mineral flotation on the scrubbed quartz sand slurry, multi-stage continuous flotation is carried out 1-4 times. Among them, each time of flotation, the collector uses an alkylamine salt cationic collector with a dosage of 100-500 g / t, the foaming agent uses 2-ethyl ethanol or pine oil with a dosage of 5-50 g / t, and at the same time, hydrofluoric acid is used to adjust the pH value of the quartz sand slurry and control the pH value of the quartz sand slurry between 2 and 6.

[0112] When performing mica mineral flotation on the scrubbed quartz sand slurry, multi-stage continuous flotation is carried out 1-4 times. Among them, each time of flotation, the collector uses an alkylamine salt cationic collector with a dosage of 100-500 g / t, the foaming agent uses 2-ethyl ethanol or pine oil with a dosage of 5-50 g / t, and at the same time, sulfuric acid is used to adjust the pH value of the quartz sand slurry and control the pH value of the quartz sand slurry between 2 and 6.

[0113] When performing iron or iron-containing mineral flotation on the scrubbed quartz sand slurry, multi-stage continuous flotation is carried out 1-4 times. Among them, each time of flotation, the collector uses a petroleum sulfonate anion collector with a dosage of 150-750 g / t, the foaming agent uses 2-ethyl ethanol or pine oil with a dosage of 5-50 g / t, and at the same time, sulfuric acid is used to adjust the pH value of the quartz sand slurry and control the pH value of the quartz sand slurry between 2 and 6;

[0114] When the scrubbed quartz mortar is used for rutile mineral flotation, multi-stage continuous flotation is used for 1-3 times, salicylic hydroxamic acid is used as a collector, the dosage is 30-90 g / ton, and 2-ethyl ethanol or pine oil is used as a foaming agent, the dosage is 5-50 g / ton. At the same time, sulfuric acid is used to adjust the pH value of the quartz mortar, and the pH value of the quartz mortar is controlled between 2-6.

[0115] In yet another embodiment, Figure 7 As shown, the wet preparation method of high-purity quartz sand includes S700 to S718, wherein the steps of S700 to S714 are the same as S100 to S114 in the previous embodiment, and will not be repeated here. The difference is that the last two steps are different. In this embodiment, the steps after S714 are:

[0116] S716, packaging the prepared quartz sand of required specifications;

[0117] S718, pickling the packaged quartz sand, wherein the specific process of the pickling step is the same as that of S116.

[0118] In this embodiment, the quartz sand is packaged first and then the pickling step is performed, which can prevent the quartz sand from being too dispersed during the pickling process, making it inconvenient for subsequent filtration.

[0119] The embodiment of the second aspect of the present invention provides a wet production line for preparing high-purity quartz sand, such as Figure 8 As shown, the production line includes:

[0120] The coarse crushing unit includes a crusher and a first screening device 14 connected to the crusher. The crusher can be Figure 8 One or a combination of the jaw crusher 10 and the cone crusher 12;

[0121] A rod mill unit, comprising a rod mill 16 and a second screening device 18, wherein the rod mill 16 is connected to the first screening device 14 via a belt conveyor, and the second screening device 18 is connected to the discharge port of the rod mill 16;

[0122] A magnetic separator is connected to the discharge port of the second screening device 18 and is used to perform magnetic separation on the quartz mortar; the magnetic separator may specifically include Figure 8 The plurality of magnetic separators (such as the first magnetic separator 22 and the second magnetic separator 24) in the embodiment of the present invention are preferably: Figure 8 As shown, the number of the first magnetic separators 22 is two, so that two magnetic separations can be performed. Of course, in other embodiments, the number of the first magnetic separators 22 may also be one or more than two;

[0123] The scrubber 3 is connected to the discharge port of the second magnetic separator 24 and is used to scrub the quartz mortar after magnetic separation;

[0124] The flotation unit includes multiple flotation machines 44 and multiple pulp mixing tanks 42 arranged in one-to-one correspondence with the multiple flotation machines 44. The multiple flotation machines 44 and the multiple pulp mixing tanks 42 are connected in series alternately one by one. The front end of the flotation unit is a pulp mixing tank, and the inlet of the frontmost pulp mixing tank is connected to the scrubber 3. A three-way connection device is provided at the outlet of the flotation machine of each flotation unit. The three-way connection device has two outlets, one outlet is used to connect to the next-stage flotation unit, and the other outlet is used to connect to the gravity separation device. Moreover, the inlet of the three-way connection device can be switched and communicated with the two outlets at will. Of course, the switching between the two outlets of the three-way connection device can also be achieved manually. With this structure, after determining the flotation scheme, the required flotation units can be connected in series between the upper and lower two processes according to the number of required flotation units;

[0125] A gravity separation device 5 and a third screening device 6, the gravity separation device 5 is connected to the inlet of the third screening device 6; the gravity separation device 5 can specifically be Figure 8 the spiral chute in

[0126] A dehydration treatment device, connected to the third screening device 6, is used for dehydrating the quartz mortar screened by the third screening device 6 to prepare quartz sand of the required specification; the dehydration treatment device can specifically include Figure 8 the belt filter 72 and the centrifugal dehydrator 74 in

[0127] A packaging unit, connected to the dehydration treatment device, is used for packaging the prepared quartz sand;

[0128] Among them, a concentration control device is provided corresponding to one or more of the rod mill unit, magnetic separation unit, scrubber, flotation unit and gravity separation device. The concentration control device includes a concentration detection device and a water supply control device connected to the concentration detection device.

[0129] Further preferably, the wet production line for high-purity quartz sand further includes: a feeding control machine, arranged at the inlet of the rod mill 16, and used for feeding the rod mill 16.

[0130] Further preferably, the magnetic separation unit includes multiple wet magnetic separators, and the wet magnetic separators are connected by a material pumping device or connected by a head difference.

[0131] Further preferably, the gravity separation device can also be a shaking table (not shown in the figure).

[0132] Further preferably, the first screening device 14, the second screening device 18 and the third screening device 6 are all wet screening devices.

[0133] Further preferably, the jaw crusher 10, the cone crusher 12 and the first screening device 14 are sequentially connected by belt conveyors.

[0134] Further preferably, the pulp mixing tank 42 is a cylindrical pulp mixing tank, and the inner wall of the cylindrical pulp mixing tank is provided with a corrosion-resistant lining material, and the inner wall of the flotation machine 44 is provided with a corrosion-resistant lining material. The setting of the corrosion-resistant lining can enhance the corrosion resistance of the equipment.

[0135] Further preferably, the reagents used in multiple flotation units include multiple collectors applicable to various impurity minerals.

[0136] Further preferably, the reagents used in multiple flotation units are all amine cationic collectors.

[0137] Further preferably, a wear-resistant rubber layer is provided on the inner wall of the scrubber 3, which can enhance the wear resistance of the scrubber 3 and thus enhance the service life of the scrubber 3.

[0138] Further preferably, the rod mill unit, the magnetic separation unit, the scrubber 3, the flotation unit and the gravity separation device are sequentially connected by a material pumping device. Through the pumping device, the flow of the mortar from the previous process to the next process can be realized, thus ensuring the pipeline production. At the same time, the pumping device can provide a certain pumping pressure, so as to ensure the flow rate of the mortar.

[0139] Such as Figure 8As shown, the wet preparation production line of high-purity quartz sand provided by the present invention includes eight processes from a to h. Among them, process a is a crushing process, which specifically includes a coarse crushing-screening process composed of a jaw crusher 10, a cone crusher 12, and a first screening device 14, and a fine crushing-screening process composed of a rod mill 16 and a second screening device 18. The function of the coarse crushing-screening process is to crush large ore into small stones, and the function of the fine crushing-screening process is to rod mill the small stones into quartz sand grains, and then screen them into quartz sand of the required specifications through the second screening device 18. Process b is a magnetic separation treatment process composed of one or more magnetic separators (including a first magnetic separator 22 and a second magnetic separator 24), and its main function is to remove mechanical iron and iron-containing minerals in the quartz sand. Scrubbing treatment is to use scrubbing equipment to remove the adhered impurities on the surface of quartz sand particles, and to round the outer contour of the particles to improve the physical and chemical properties of the particles. Process c is a scrubbing treatment process composed of a scrubber 3. Process d is a flotation treatment process formed by alternately connecting a plurality of pulp conditioning tanks 42 and a plurality of flotation machines 44 in series. In this process, multiple pulp conditioning tanks 42 and flotation machines 44 are used in series to form a continuous flotation production line adaptable to different ore types. According to the types and contents of impurity minerals in the ore, various equipment combinations can be used. For example, when the impurity minerals are relatively single, the number of pulp conditioning tanks and flotation machines can be reduced to float out qualified products. Process e is a gravity separation process, and in Figure 8 it, the gravity separation process is realized by a spiral chute. Gravity separation treatment is to use equipment such as a shaking table or a spiral chute to remove heavy minerals in the quartz sand. Process f is a third screening treatment process composed of a third screening device 6, and process g is a dehydration treatment process, and in Figure 8In the provided embodiments, the dehydration treatment of process g is mainly completed by the belt filter 72 and the centrifuge 74. During actual use, these two devices can be selectively used according to the requirements of subsequent processing to remove most of the moisture in the quartz sand. Process h is the packaging treatment process. After packaging, the well-packaged product 8 can be prepared. Through the above-mentioned links, an automated continuous production line can be connected in series. This automated continuous production line can input large pieces of ore at the starting end of the production line and produce quartz sand with a particle size less than 1 mm at the dehydration and packaging end. It can carry out continuous flow operation without interruption, realizing the continuous and highly efficient production of quartz sand. Moreover, through magnetic separation, flotation treatment, and gravity separation, most of the impurities in the quartz sand can be separated by this preparation method, enabling the SiO2 content of the prepared quartz sand to be as high as over 99.995%, that is, the impurity content is less than 50 ppm, thus ensuring the purity of the quartz sand. Of course, through the production line provided in this application, by reducing the requirements of each process, quartz sand with an impurity content greater than 50 ppm can also be produced. That is, the impurity content of the quartz sand produced by the production line provided in this application can be either greater than 50 ppm or less than 50 ppm, and even less than 30 ppm. At the same time, for the wet preparation method and wet preparation production line of high-purity quartz sand provided in this application, due to the use of wet sand making, compared with the existing dry sand making, it can perform corresponding flotation according to the impurity content, thereby reducing costs. Moreover, wet sand making has low energy consumption and basically no dust pollution, thus reducing the energy consumption of sand making and reducing the environmental pollution during the sand making process.

[0140] Furthermore, the wet preparation production line of high-purity quartz sand further includes: an acid washing device for acid washing, water washing, and drying the prepared quartz sand of the required specifications.

[0141] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", etc. mean 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 application. 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.

[0142] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A wet preparation method of high-purity quartz sand, characterized in that, it includes: Coarsely crushing the original ore, and screening out the ore fragments less than or equal to the preset size after the coarse crushing treatment; Mixing the screened ore fragments with water and then performing fine crushing treatment, and screening the mixture after the fine crushing treatment to screen out the quartz mortar less than or equal to the upper limit of the required particle size; Removing mechanical iron and iron-containing minerals in the quartz mortar through magnetic separation treatment. Among them, in the magnetic separation treatment, multiple wet magnetic separators are used for magnetic separation treatment; Performing scrubbing treatment on the magnetically separated quartz mortar. The scrubbing treatment is to use scrubbing equipment to remove the adhering impurities on the surface of the quartz sand particles, and to round the outer contour of the particles to improve the physical and chemical properties of the particles; then performing multi-stage flotation treatment on the scrubbed quartz mortar to remove the impurity minerals in the quartz mortar. During flotation, hydrofluoric acid and / or sulfuric acid are used to adjust the pH value of the quartz mortar, and the pH value of the quartz mortar is controlled between 2 and 6; Performing gravity separation on the quartz mortar after flotation treatment by using the gravity separation process to remove the heavy minerals in the quartz mortar; Screening the quartz mortar after gravity separation treatment to remove the quartz sand less than the lower limit of the required particle size in the quartz mortar; After removing the quartz sand less than the lower limit of the required particle size in the quartz mortar, performing dehydration treatment on the quartz mortar to prepare the quartz sand of the required specification; Performing pickling on the prepared quartz sand of the required specification. The steps of pickling include: Preparing a pickling solution. The pickling solution includes a hydrogen fluoride solution. Immerse the prepared quartz sand of the required specification into the pickling solution for pickling, filter out the pickled quartz sand, wash and dry the filtered quartz sand. The hydrogen fluoride solution is an aqueous solution of hydrogen fluoride, and its concentration range is 5%-40%. When the quartz sand and the hydrogen fluoride solution are sealed and soaked in a sealed tank, the soaking temperature is 40°C - 120°C, and the soaking time is 2h - 5h; During the magnetic separation treatment, multi-stage flotation treatment and gravity separation, the mortar concentration is controlled within the range of greater than 0 and less than or equal to 30%; During the scrubbing treatment, the mortar concentration is controlled within the range of greater than 70%; The step of performing multi-stage flotation treatment on the scrubbed quartz mortar specifically includes: performing the following one or more flotations on the scrubbed quartz mortar: feldspar mineral flotation, mica mineral flotation, rutile mineral flotation, iron or iron-containing mineral flotation, epidote mineral flotation, tremolite mineral flotation, and actinolite mineral flotation; and / or When performing any kind of mineral flotation on the scrubbed quartz mortar, multi-stage continuous flotation is carried out 1 - 4 times. And each time during flotation, the flotation reagents include one of alkylamine salt cationic collectors, petroleum sulfonate anion collectors, and salicylhydroxamic acid, 2-ethyl ethanol or pine oil used as a foaming agent, with a dosage of 5 - 50 g / ton, and hydrofluoric acid and / or sulfuric acid used to adjust the pH value; and / or The steps of performing multiple flotations on the scrubbed quartz mortar include: Determine the flotation scheme, determine the number of required flotation units according to the flotation scheme, connect the required flotation units in series in sequence, and connect the multiple series-connected flotation units at the corresponding positions; Put the required flotation reagents into the pulp conditioning tank of each flotation unit and carry out pulp conditioning; After the pulp conditioning is completed, let the scrubbed quartz sand slurry pass through each flotation unit in sequence to achieve multi-stage flotation. Among them, when carrying out feldspar mineral flotation on the scrubbed quartz sand slurry, multi-stage continuous flotation is carried out 1-4 times. Among them, each time of flotation, the collector adopts an alkylamine salt cationic collector, with a dosage of 100-500 g / t, the foaming agent adopts 2-ethyl ethanol or pine oil alcohol, with a dosage of 5-50 g / t. At the same time, hydrofluoric acid is used to adjust the pH value of the quartz sand slurry, and the pH value of the quartz sand slurry is controlled between 2-6; When carrying out mica mineral flotation on the scrubbed quartz sand slurry, multi-stage continuous flotation is carried out 1-4 times. Among them, each time of flotation, the collector adopts an alkylamine salt cationic collector, with a dosage of 100-500 g / t, the foaming agent adopts 2-ethyl ethanol or pine oil alcohol, with a dosage of 5-50 g / t. At the same time, sulfuric acid is used to adjust the pH value of the quartz sand slurry, and the pH value of the quartz sand slurry is controlled between 2-6; When carrying out iron or iron-containing mineral flotation on the scrubbed quartz sand slurry, multi-stage continuous flotation is carried out 1-4 times. Among them, each time of flotation, the collector adopts a petroleum sulfonate anionic collector, with a dosage of 150-750 g / t, the foaming agent adopts 2-ethyl ethanol or pine oil alcohol, with a dosage of 5-50 g / t. At the same time, sulfuric acid is used to adjust the pH value of the quartz sand slurry, and the pH value of the quartz sand slurry is controlled between 2-6; When carrying out rutile mineral flotation on the scrubbed quartz sand slurry, multi-stage continuous flotation is carried out 1-3 times. Salicylhydroxamic acid is used as the collector, with a dosage of 30-90 g / t, the foaming agent adopts 2-ethyl ethanol or pine oil alcohol, with a dosage of 5-50 g / t. At the same time, sulfuric acid is used to adjust the pH value of the quartz sand slurry, and the pH value of the quartz sand slurry is controlled between 2-6.

2. The wet preparation method of high-purity quartz sand according to claim 1, characterized in that, The step of performing coarse crushing treatment on the original ore and screening out the ore fragments smaller than or equal to the preset size after the coarse crushing treatment specifically includes: Performing the first coarse crushing on the original ore through a jaw crusher, and performing the second coarse crushing on the original ore after the first coarse crushing through a cone crusher; Screen out the ore fragments smaller than or equal to the preset size through the first screening device.

3. The wet preparation method of high-purity quartz sand according to claim 2, characterized in that, The step of mixing the screened ore fragments with water and then performing fine crushing treatment, and screening the mixture after the fine crushing treatment to screen out the quartz sand slurry smaller than or equal to the upper limit of the required particle size includes: Transport the ore fragments screened out by the first screening device to a feeding control machine, and feed the ore fragments into the feed bin of the rod mill through the feeding control machine; Add water to the bin of the rod mill, and finely crush the ore fragments in the bin through the rod mill. Screen the mixture after fine crushing through a second screening device to screen out quartz mortar with a particle size less than or equal to the upper limit of the required particle size.

4. The wet preparation method of high-purity quartz sand according to claim 1, characterized in that, before the coarse crushing treatment, it further includes: shoveling the ore raw material into the bin of the vibrating feeder, and then feeding the coarse crusher through the vibrating feeder; and / or in the magnetic separation treatment, multiple wet magnetic separators are used for magnetic separation treatment; and / or when dehydrating the quartz mortar with a particle size less than the lower limit of the required particle size removed, dehydrate it through a centrifuge or a belt filter; and / or the prepared quartz sand has a particle size less than or equal to 1 mm, and the impurity content of the prepared quartz sand is less than or equal to 50 ppm.

5. A wet preparation production line of high-purity quartz sand, based on the wet preparation method of high-purity quartz sand according to any one of claims 1-4, characterized in that, it includes: a coarse crushing unit, the coarse crushing unit includes a coarse crusher and a first screening device communicated with the coarse crusher; a rod mill unit, including a rod mill and a second screening device, the rod mill is communicated with the first screening device, and the second screening device is connected to the discharge port of the rod mill; a magnetic separation unit, connected to the discharge port of the second screening device, for magnetic separation treatment of the quartz mortar; a scrubber, connected to the discharge port of the magnetic separation unit, for scrubbing the magnetically separated quartz mortar; a flotation unit, including a plurality of flotation units that can be connected in series, each flotation unit includes a flotation machine and a pulp conditioning tank connected in series, and the pulp conditioning tank of each flotation unit is arranged in front of the flotation machine. The inlet of the pulp conditioning tank at the front end of the flotation unit is connected to the scrubber, and the outlet of the flotation machine of each flotation unit can be detachably connected to the gravity separation device; a third screening device and the gravity separation device, the gravity separation device is used for gravity separation of the quartz mortar after flotation treatment to remove heavy minerals in the quartz mortar, and the outlet of the gravity separation device is provided with the third screening device, and the third screening device is used for removing quartz sand with a particle size less than the lower limit of the required particle size in the quartz mortar; a dehydration treatment device, connected to the third screening device, for dehydrating the quartz mortar screened by the third screening device to prepare quartz sand of the required specification; an acid pickling device, the acid pickling device is used for acid pickling the prepared quartz sand; wherein, a concentration control device is provided corresponding to one or more of the rod mill unit, the magnetic separation unit, the scrubber, the flotation unit and the gravity separation device, and the concentration control device includes a concentration detection device and a water supply control device connected to the concentration detection device.

6. The wet preparation production line of high-purity quartz sand according to claim 5, characterized in that, the wet preparation production line of high-purity quartz sand further includes a packaging unit, connected to the dehydration treatment device, for packaging the prepared quartz sand; and / or The magnetic separation unit includes multiple magnetic separators, which are connected by a material pumping device or by using a head difference between the multiple magnetic separators; and / or The gravity separation device includes one or two of a shaking table or a spiral chute; and / or The dehydration treatment device includes a high-speed centrifugal dehydrator and / or a belt filter; and / or The first screening device, the second screening device, and the third screening device are all wet screening devices; and / or The coarse crusher includes a jaw crusher and a cone crusher, and the jaw crusher, the cone crusher, and the first screening device are sequentially connected by a belt conveyor; and / or The pulp mixing tank is a cylindrical pulp mixing tank, the inner wall of the cylindrical pulp mixing tank is provided with a corrosion-resistant lining material, and the inner wall of the flotation machine is provided with a corrosion-resistant lining material; and / or The flotation reagents used in multiple flotation units include multiple collectors applicable to various impurity minerals; and / or A rubber layer is provided on the inner wall of the scrubber; and / or The rod mill unit, the magnetic separation unit, the scrubber, the flotation unit, and the gravity separation device are sequentially connected by a material pumping device.

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