Quartz sand beneficiation and purification process method

Abstract

The invention relates to a mineral separation and purification process method of quartz sand, which comprises the following steps: sequentially carrying out coarse crushing, intermediate crushing and fine crushing on raw ore, and after fine crushing, screening to obtain a fine product; sequentially carrying out ore grinding, primary screening, primary desliming, hindered settling, secondary screening, secondary desliming, hydraulic classification and hydraulic classification on the fine crushed product to obtain fine sand and magnetic separation sand; performing low-intensity magnetic separation, first-stage high-intensity magnetic separation and second-stage high-intensity magnetic separation on the magnetic separation sand, and dehydrating to obtain fine sand; the fine sand is subjected to acid pickling, and the fine sand subjected to acid pickling is subjected to deacidification; washing the deacidified fine sand until the fine sand is neutral; and the washed fine sand is subjected to ore grinding and screening after being dehydrated and dried, and the glass sand and the superfine silica powder are obtained respectively. Three different products, namely photovoltaic glass quartz sand, high-grade plate quartz sand and optical glass quartz sand, can be finally obtained according to the ore supply conditions of raw ore, and can meet the industrial requirements of solar glass, crystal glass, high-grade glassware and the like.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, in particular to a quartz sand ore dressing and purification process. Background Art

[0002] The main raw material of glass silica in foreign countries (the United States, Russia, Japan, Germany, and the United Kingdom) is quartz sand, but Canada uses quartzite for mining; while the main raw materials of glass silica in my country are quartzite and quartz sandstone (accounting for 2 / 3), and quartz sand only accounts for 1 / 3. 2 The content is higher than that in my country, Fe 2 0 3 The content is lower than that in my country. The quartz sand used by various countries is generally produced and used by themselves. Due to the uneven distribution of resources and slightly higher prices, most countries have a certain amount of imports and exports in addition to self-production. Due to the lack of resources and complex separation technology, high-purity and ultra-pure sands are basically supplied by UniminCrop in the United States, except for Russia, Germany, Japan and other countries that can be self-sufficient.

[0003] At present, my country can be self-sufficient in producing ordinary sand, high-quality sand and even quasi-high-purity sand, but high-purity sand and ultra-high-purity sand (especially Si0 2 Ultra-high purity sand with a content of more than 99.99%) Due to high quality requirements, my country's ultra-high purity sand is entirely dependent on imports. These ultra-high purity sands are raw materials for the manufacture of photovoltaic glass, high-end glassware and optical glass. For example, optical glass can be used in optical instruments, photographic equipment, telescopes, microscopes and other applications to accurately control the propagation and refraction of light to obtain clear, high-quality images and observation results. In addition, optical glass also has a large market demand in new fields such as photovoltaic glass, lidar, optical sensors, VR / AR equipment, etc. Therefore, how to propose an independently researched quartz sand beneficiation and purification process method in China to fill the gap in the preparation of ultra-high purity sand in my country is becoming more and more urgent.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a process for beneficiation and purification of quartz sand.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A quartz sand beneficiation and purification process comprises the following steps:

[0008] S100, the raw ore is subjected to coarse crushing, medium crushing and fine crushing in sequence, the screen-surface product after fine crushing is returned to the fine crushing to form a closed circuit, and the screen-surface product after fine crushing is the fine crushing product;

[0009] S200, the finely crushed product flows by gravity into the drum screen after grinding in the rod mill for primary inspection and screening, the screened material after the primary inspection and screening flows by gravity into the desludging bucket for primary desludging, the product after the primary desludging flows by gravity into the obstructed sedimentation machine for primary classification, the fine-grained material after the obstructed sedimentation flows by gravity into the drum screen for secondary inspection and screening, the screened material after the secondary inspection and screening flows by gravity into the desludging bucket for secondary desludging, the product after the secondary desludging flows by gravity into the hydraulic classifier for secondary classification, and fine sand and magnetic separation sand are obtained after the secondary classification;

[0010] S300, sequentially subjecting the magnetically separated sand to weak magnetic separation, first-stage strong magnetic separation and second-stage strong magnetic separation, removing the iron-containing substances and dehydrating to obtain concentrated sand;

[0011] S400, pickling the concentrated sand, deacidifying the pickled concentrated sand, washing the deacidified concentrated sand until it is neutral, dehydrating and drying the washed concentrated sand, grinding it, and sieving it to obtain glass sand and ultrafine silicon powder, respectively.

[0012] Preferably, in step S200:

[0013] The oversize products after primary screening and secondary screening and the coarse particles obtained by hindered sedimentation flow into the rod mill for re-grinding, forming a closed-circuit grinding.

[0014] The fine mud obtained after the primary and secondary desludging is concentrated by a high-efficiency thickener, and then dehydrated to obtain dry ore mud.

[0015] Preferably, in step S300:

[0016] The iron-containing materials removed in the weak magnetic separation, the first stage strong magnetic separation and the second stage strong magnetic separation are dehydrated to obtain the iron-containing magnetic tailings.

[0017] Preferably, it is characterized in that, in the step S400:

[0018] The specific method of pickling the concentrated sand includes the following: adding hydrochloric acid to the concentrated sand, dynamically reacting at a temperature of 75-90 degrees for 3-6 hours, and then deacidifying.

[0019] Preferably, it is characterized in that, in the step S400:

[0020] The deacidified concentrated sand is washed in the following manner: the deacidified concentrated sand is sent to a water washing device for primary washing and secondary washing until the concentrated sand is neutral.

[0021] Preferably, it is characterized in that, in the step S400:

[0022] The deacidified concentrated sand is washed, and the wastewater generated during the dehydration of the washed concentrated sand is treated. The specific treatment methods include:

[0023] S500, after the wastewater is introduced into the regulating tank, the regulating tank adjusts the water level of the wastewater through the liquid level control device and the raw water delivery pump;

[0024] S510, the wastewater in the regulating tank flows into the first reaction tank, and H is added in the first reaction tank according to the pH value. 2 SO 4 Solution or NaOH solution;

[0025] S520, the effluent from the reaction tank overflows into the coagulation tank through the overflow port, and H is added to the coagulation tank according to the pH value. 2 SO 4 solution or NaOH solution, adding PAC and defluoridation agent at the same time;

[0026] S530, the effluent from the coagulation tank overflows into the coagulation tank through the overflow port, and a PAM polymer coagulant is added into the coagulation tank;

[0027] S540, the effluent from the coagulation tank passes through the diversion trough and the high-efficiency sedimentation tank for gravity sedimentation. The supernatant in the high-efficiency sedimentation tank enters the water production tank through the overflow weir and meets the discharge standards.

[0028] Preferably, in step S540:

[0029] The sludge at the bottom of the high-efficiency sedimentation tank is transported to the sludge thickening tank by a sludge pump for mud-water separation. The sludge at the bottom of the sludge thickening tank is transported to the filter press by a sludge pump for filtration and dehydration. The filtrate obtained from the sludge thickening tank is returned to the regulating tank through the drain pipe.

[0030] Preferably, a mechanical stirring device is provided in the reaction tank, the coagulation tank and the flocculation tank.

[0031] Preferably, H 2 SO 4 The solution was stored in H 2 SO 4 In the storage tank, H 2 SO 4 The solution in the storage tank is added to each medication point through a metering pump; the NaOH solution is stored in the NaOH storage tank, and the solution in the NaOH storage tank is added to each medication point through a metering pump; the PAC solution is stored in the PAC storage tank, and the solution in the PAC storage tank is added to each medication point through a metering pump; the PAM solution is stored in the PAM storage tank, and the solution in the PAM storage tank is added to each medication point through a metering pump; the defluorinator is stored in the defluorinator storage tank, and the solution in the defluorinator storage tank is added to each medication point through a metering pump;

[0032] H 2SO 4 The storage tank, NaOH storage tank, PAC storage tank, PAM storage tank and defluorination agent storage tank are all equipped with liquid level control devices, which will sound an alarm when the liquid level is low.

[0033] Compared with the prior art, the quartz sand beneficiation and purification process proposed by the present invention has the following beneficial effects:

[0034] 1. The goal is to produce glass sand, optical glass quartz sand, silica powder and various downstream products of quartz materials with high technical content and high added value, which is in line with the strategic requirements of national economic development.

[0035] 2. High-quality mineral product deep processing projects are in line with local development plans and can create good social benefits.

[0036] 3. The products can be widely used in various glass products such as glass, photovoltaic glass, crystal glass, high-end glassware, etc., and have obvious competitive advantages in product quality and sales. They are in line with the development and needs of domestic and foreign markets, and have broad sales prospects.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below for detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 The present invention is a crushing and screening process flow chart of a quartz sand beneficiation and purification process method.

[0040] Figure 2 The present invention is a quartz sand beneficiation and purification process method of the present invention. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with 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. The components of the embodiments of the present invention generally described and shown herein can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0042] This embodiment provides a quartz sand beneficiation and purification process. In this embodiment, the raw ore supply conditions include three raw ores, and finally three different products can be obtained, namely photovoltaic glass quartz sand, high-grade plate quartz sand, and optical glass quartz sand. The specific technical indicators of the three products are shown in the following table:

[0043] Table 1-1 Main technical indicators of photovoltaic glass quartz sand products

[0044] Product Name Average SiO2 grade (%) Yield (%) Output (10,000 t / a) Ore 91.0 100 50.00 Fine sand ≥98.80％ 78 39.0 Fine sand - 10 5.0 Mineral mud - 8.00 4.0 Magnetic tailings - 4 2.0

[0045] Table 1-2 Main product technical indicators of high-grade quartz sand

[0046] Product Name Average SiO2 grade (%) Yield (%) Output (10,000 t / a) Ore 96.3 100 20 Fine sand ≥99.8％ 85 17.0 Fine sand - 8.6 1.72 Mineral mud - 3.5 0.7 Magnetic tailings - 2.9 0.58

[0047] Table 1-3 Main product technical indicators of optical glass quartz sand

[0048] Product Name Average SiO2 grade (%) Yield (%) Output (10,000 t / a) Ore 99.6 100 10 Fine sand ≥99.99％ 90 9 Fine sand - 5 0.5 Mineral mud - 3.5 0.35 Magnetic tailings - 1.5 0.15

[0049] This embodiment first adopts a three-stage one closed-circuit crushing process flow, and the final crushing particle size is 10-0mm. The grinding process adopts a one-stage closed-circuit grinding, the classification adopts hindered sedimentation classification, and the iron and impurity removal adopts a one-stage weak magnetic and two-stage strong magnetic purification process.

[0050] 1. The selection of the main production equipment for crushing and grinding processes is mainly as shown in Table 2 and Table 3 below. Table 2 Main equipment of crushing system

[0051]

[0052]

[0053] Table 3 Main equipment of grinding and selection system

[0054]

[0055]

[0056] 2. Forms of each mine warehouse

[0057] The ore storage facilities of the ore dressing plant are shown in Table 4 below.

[0058] Table 4 Ore storage facilities

[0059] Workshop Name Mine Bin Usage Mine warehouse form Ore storage yard Ore storage shed Ore storage shed Coarse crushing workshop Ore warehouse Semi-underground Medium and fine crushing workshop Buffer Bin Elevated Grinding bin Grinding bin Elevated Concentrated sand storage Concentrated sand storage Closed storage Fine sand reservoir Fine sand reservoir Closed storage Sludge storage Sludge storage Closed storage Magnetic tailings reservoir Magnetic tailings reservoir Closed storage

[0060] 3. Brief description of workshop composition and production process

[0061] 3.1 Workshop composition

[0062] It consists of raw ore stockpile, coarse crushing workshop, medium and fine crushing workshop, screening workshop, raw ore yard, grinding bin, grinding and sorting workshop, concentrate storage, fine sand storage, magnetic tailings storage, and ore slime storage. The workshops are connected by belt conveyor corridors, and the grinding and sorting workshops are connected by pipelines.

[0063] 3.2 Brief description of production process

[0064] The mined ore is transported by car to the coarse crushing ore bin and enters the crushing and screening process. After crushing and screening, qualified products enter the grinding process. The materials are fed into a grinding device (1 MBB2124 rod mill) by a belt conveyor for grinding. The grinding products are fed into the drum screen by gravity for inspection and screening. The materials on the screen (>2mm) are returned to the mill for re-grinding. The materials under the drum screen are pumped to the desludging bucket for desludging. The desludging products flow into the blocked sedimentation machine by gravity. The fine particles after the blocked sedimentation flow into the inspection screen by gravity. The materials on the screen (>0.71mm) and the coarse-grained materials that are blocked from settling flow into the mill for re-grinding, forming a closed-circuit grinding; the materials under the screen (0-0.71mm) flow into the desludging bucket for desludging, and the products flow into the hydraulic classifier for classification. The hydraulic classifier has two kinds of products, of which (0-0.1mm) materials enter the fine sand reservoir and form product fine sand after filtration; and (0.1-0.74mm) materials flow into the magnetic separation operation (weak magnetic separation + strong magnetic separation) by gravity. The products after magnetic separation are dehydrated to form the final product, concentrated sand, which is stored in the concentrated sand reservoir; the iron after magnetic separation enters the magnetic tailings reservoir for filtration and storage.

[0065] The fine mud from the desludging operation flows by gravity through the chute into the high-efficiency thickener. The underflow of the thickener is transported by the underflow pump to the mud dehydration system (plate and frame filter press + vacuum ceramic filter unit). The dehydrated product is dry mud, which is stored in the dry mud storage, and the filtrate enters the circulating water system.

[0066] After the concentrated sand is naturally filtered and reaches the moisture content requirement of the sand selection plant, it is transported to the purification workshop for purification processing.

[0067] 4. Concentration determination and metering during production

[0068] According to the requirements of the mineral processing process, the concentration of wet operations such as rod grinding, desludging, classification, and magnetic separation is measured in real time to automatically control the production process. The measurement in the production process is determined by the interception of ore per unit time or by the results of concentration measurement and the interception of slurry per unit time after simple calculation. The raw ore is brought into the site, and the concentrated sand and fine sand produced are transported out using a floor scale for measurement; the water consumption in the production process is measured by a flow meter and controlled by a valve. A belt scale is installed on the grinding mill feed belt conveyor to measure the powder ore.

[0069] 5. Auxiliary facilities

[0070] In order to remove the debris, an iron remover is installed on the belt conveyor to prevent the debris from damaging the cone crusher.

[0071] 6. Quartz sand purification process

[0072] 6.1 Main equipment of purification system is shown in Table 5

[0073] Table 5 Main equipment of purification system

[0074]

[0075]

[0076] 6.2 Brief description of purification process

[0077] 6.2.1 Purification Section

[0078] The concentrated sand (Fe 2 0 3 <200PPm) is sent to the purification device by a loading truck, and then acid (mainly hydrochloric acid) is added. Dynamic reaction is carried out at a temperature of 75-90°C for 3-6 hours to remove the acid, which can be recycled.

[0079] 6.2.2 Water washing section

[0080] Use a sand pump to send the deacidified sand to a water washing device for washing until it becomes neutral.

[0081] 6.2.3 Dehydration

[0082] The mortar washed to neutral is dehydrated by a centrifuge and packed into ton bags for storage and sale as a product.

[0083] 6.2.4 Drying workshop

[0084] The qualified quartz sand products are dried in a fluidized bed and sent to the grinding and screening workshops as raw materials for glass sand and silicon micropowder.

[0085] 6.2.5 Grinding and screening workshop

[0086] The dried quartz sand is ground to the specified particle size by a ball mill and sieved by a classifier. The qualified product is glass sand, and the over-fine product is ultra-fine silicon powder.

[0087] 6.2.6 Mechanical and electrical repair workshop, material warehouse

[0088] The electromechanical repair workshop is built to undertake medium and small repairs of equipment, and process some spare parts and non-standard parts of mechanical equipment.

[0089] 6.2.7 Laboratory

[0090] (1) Carry out routine physical and chemical analysis on raw sand, finished sand and other products, so as to timely grasp the quality changes of raw sand and finished sand during the production process, ensure the quality of the products, and assist the production workshop in analyzing the causes of quality accidents.

[0091] (2) Regularly sample and analyze the products of key operations in the production process to guide production and ensure product quality.

[0092] (3) Monitor the water quality of production and domestic water.

[0093] 6.2.8 Auxiliary production facilities

[0094] Auxiliary production facilities.

[0095] (1) Steam boiler room

[0096] The purification section and the drying section require steam heating. A steam boiler room is set up, natural gas is used as fuel, and a steam boiler is selected. A water softening device is installed in the boiler room to provide softened water for the boiler room.

[0097] (2) Wastewater treatment facilities

[0098] 1) Influent water quality (see Table 6 for influent water quality indicators of production wastewater system)

[0099]

[0100] 2) Effluent quality (see Table 7 for effluent quality indicators of production wastewater system)

[0101]

[0102]

[0103] 3) Main pollutant indicators of water quality discharged from production wastewater system (see Table 8 for Level A standard of "Comprehensive Wastewater Discharge Standard" (GB8978-2002))

[0104]

[0105] The effluent water quality index exceeds the Level A standard of the Integrated Sewage Discharge Standard (GB8978-2002).

[0106] 7. Wastewater process design

[0107] 7.1 Treatment process

[0108] Process analysis and selection

[0109] According to the analysis of the influent water quality, the raw water is mainly treated fluoride-containing wastewater, and the pollutants in the wastewater are mainly fluoride ions, and the main form of fluorine is F-.

[0110] Calcium hydroxide is added to conventional fluoride-containing wastewater to generate insoluble CaF2 precipitate by the reaction of F- and Ca2+, which is then removed from the wastewater by solid-liquid separation to achieve the purpose of fluoride removal. The reaction principle is as follows:

[0111] Ca 2+ +F - =CaF 2 ↓

[0112] At 25℃, CaF 2 The saturated solubility in water is 16.5 mg / l, of which F- ions account for 8.03 mg / l. CaF 2 Solids, soluble CaF in the treated effluent 2 It is no longer able to meet the current national wastewater discharge standards. Generally, fluoride-containing wastewater contains a large amount of salt, which will have a salt effect on the defluorination reaction. Due to the above reasons, the fluoride removal effluent of the traditional defluorination physical and chemical process will not be lower than 6.0 mg / L. Therefore, special methods are required for deep treatment of fluoride-containing wastewater.

[0113] By using a special defluorination agent, the fluoride can be further removed to below 1.5 mg / L by adding the defluorination agent in the "heteronuclear crystallization + coagulation precipitation" process section, meeting the process requirements of this embodiment.

[0114] The defluoridation agent is a solid powder, which is not easy to deliquesce and deteriorate. The inorganic polymer of the deep defluoridation agent has many OH groups, which have hydrogen bonding properties and have a strong attraction to F- ions. They can penetrate the salt effect barrier, thereby improving the defluoridation efficiency and stabilizing the effluent below 1.5 mg / L, meeting the process requirements of this project.

[0115] 7.2 Description of wastewater process flow

[0116] 7.2.1 Wastewater lifting system:

[0117] Fluoride-containing wastewater is collected through the fluoride-containing wastewater discharge pipeline. A liquid level control device (LS original) is installed in the homogenization regulating tank to work in conjunction with the newly added raw water delivery pump (P-102A~F). When the wastewater level is higher than the pre-adjusted high water level (HL: pump start level), the control device automatically starts the newly added raw water delivery pump (P-102A~F) to lift the wastewater to reaction A (T-103); when the wastewater level is lower than the pre-adjusted low water level (L: pump stop level), the control device automatically stops the newly added raw water delivery pump (P-102A~F) and alarms when the high-high liquid level (HH: alarm level) is reached.

[0118] 7.2.2 Wastewater reaction, coagulation and sedimentation system:

[0119] (1) In the reaction tank (T-103A~F), a mechanical stirring device (M-101A~F) and a pH meter (pH01 A~F) are installed. The H2SO4 pneumatic diaphragm valve and the NaOH pneumatic diaphragm valve are linked with the newly added raw water delivery pump (P-102A~F) and are controlled by the pH meter (pH01 A~F). H2SO4 and NaOH are added according to the pH meter reading and the upper and lower relay point settings. The mechanical stirring device (M-101A~F) is linked with the newly added raw water delivery pump (P-102A~F) to allow the reagent to fully react with the wastewater.

[0120] (2) The effluent from the reaction tank (T-103A~F) flows through the overflow port to the coagulation tank (T-104A~F), which is equipped with a mechanical stirring device (M-102A~F) and a pH meter (pH02 A~F). The H2SO4 pneumatic diaphragm valve and the NaOH pneumatic diaphragm valve are linked to the newly added raw water delivery pump (P-102A~F) and are controlled by the pH meter (pH02 A~F). H2SO4 and NaOH are added according to the pH meter reading and the upper and lower relay point settings. The PAC metering pump is linked to the newly added raw water delivery pump (P-102A~F) to quantitatively add PAC, and the defluorination agent metering pump is linked to the newly added raw water delivery pump (P-102A~F) to quantitatively add defluorination agent, to coagulate the suspended matter in the wastewater and further reduce the F- content. The mechanical stirring device (M-102A~F) is linked with the newly added raw water delivery pump (P-102A~F) to allow the reagent to fully react with the wastewater.

[0121] (3) The effluent from the coagulation tank (T-104A~F) flows into the coagulation tank (T-105A~F) through the overflow port. The PAM metering pump is linked with the newly added raw water delivery pump (P-102A~F). The PAM polymer coagulant is quantitatively added to connect the coagulants in the wastewater into alum flowers with high precipitation performance. A mechanical stirring device with a low speed (M-103A~F) is installed in the coagulation tank to allow the agent to fully react with the wastewater and prevent bottom precipitation.

[0122] (4) The effluent from the coagulation tank (T-105A~F) flows into the diversion trough by gravity, changes the direction of the water flow, and enters the high-efficiency sedimentation tank (T-106A~F) for gravity sedimentation. The supernatant enters the water production tank through the overflow weir and meets the discharge standards. The sludge deposited at the bottom of the tank gathers in the sludge collection bucket in the center of the sedimentation tank, and is regularly transported to the newly added sludge concentration tank (T-108) through the sludge pump (P-103A~M) of the high-efficiency sedimentation tank (T-106A~F).

[0123] 7.2.3. Wastewater sludge treatment system:

[0124] During the wastewater treatment process, the sludge (main components: complex precipitation materials, pharmaceutical impurities, etc.) deposited in the mud bucket at the bottom of the sedimentation tank is transported to the newly added sludge thickening tank (T-108) for mud and water separation by the sludge pump (P-103A~M) started at a fixed time by the PLC according to the cumulative running time of the newly added raw water delivery pump (P-102A~F). The sludge has a water content of about 99%. The sludge at the bottom of the sludge thickening tank (T-108) is transported to the filter press (S-103A~D) by the sludge pump (P-119A~M). After the pressed sludge (sludge water content is about 75%~80%), it is bagged and dried in the shade, and the sludge is transported to the outside by car at a fixed time. The filtrate flows back to the homogenization regulating tank through the drainage pipe for secondary treatment.

[0125] 7.2.4, Pharmaceutical system:

[0126] 1) Fluorine removal agent storage tank: Liquid 25% fluorine removal agent is transported to the wastewater station by tank truck, transported to the fluorine removal agent storage tank by the agent delivery pump, and added to each drug application point by the metering pump. The storage tank is equipped with a liquid level control, and an alarm is sounded when the liquid level is low, notifying the operator to add the agent.

[0127] 2) NaOH storage tank: Liquid 30% NaOH is transported to the wastewater station by tank trucks, transported to the NaOH storage tank by a reagent delivery pump, and added to each medication point by a metering pump. The storage tank is equipped with a liquid level control, and an alarm is triggered when the liquid level is low, notifying the operator to add reagents.

[0128] 3) H 2 SO 4 (Tentative) Storage tank: Liquid 30% H 2 SO 4 It is transported to the wastewater station by tank trucks, and then transported to the HCL storage tank by the chemical delivery pump. The chemical is added to each use point by the metering pump. The storage tank is equipped with a liquid level control, and an alarm is triggered when the liquid level is low, notifying the operator to add chemical.

[0129] 4) PAC tank: Liquid 10% PAC is transported to the wastewater station by tank trucks and then transported to the PAC tank by a tank pump. The tank is equipped with an air stirring device to prevent precipitation. The agent is added to each medication point by a metering pump. The storage tank is equipped with a liquid level control. When the low liquid level alarm is triggered, the operator is notified to add the agent.

[0130] 5) PAM dissolving tank: solid PAM is quantitatively added to the PAM dissolving tank through the doser, and the mixer is used to stir the PAM and water to dissolve quickly, with a concentration of 0.1%. The uniform agent is added to each medication point through the metering pump. The storage tank is equipped with a liquid level control. When the low liquid level alarm is sounded, the operator is notified to add the agent.

[0131] 8. Tailings treatment system

[0132] 8.1 Tailings mud information

[0133] Tailings concentration discharged from the main powerhouse: 0.86%;

[0134] 8.2 Tailings Chute

[0135] The tailings are transported from the main powerhouse to the thickening pool by chute. The tailings chute is designed to be 650×650mm in size, made of steel plate and lined with 25 cast stone plate. Combined with the topography of the concentrator, the slope of the tailings chute is I=0.02.

[0136] 8.3 Tailings Thickening

[0137] (1) Thickener selection

[0138] Two ￠45m high-efficiency thickeners are selected, and the actual sedimentation area is 3020m 2 The thickener flocculant is polyacrylamide, and the dosing device is equipped with a high-efficiency thickener and is located in the tailings dewatering workshop.

[0139] (2) Thickener technical parameters

[0140] Tailings slurry volume treated: 1005.17m 3 / h;

[0141] Tailings treatment volume: 8.644t / h;

[0142] Thickener underflow concentration: not less than 30%;

[0143] Thickener overflow water quality: SS not more than 30mg / L.

[0144] (3) Overflow and underflow of the concentrator:

[0145] Thickening tank bottom flow slurry flow: 51.39m 3 / h;

[0146] Overflow flow of concentrator: 953.78m 3 / h.

[0147] (4) Concentration tank structure dimensions

[0148] The thickening tank adopts reinforced concrete structure, with an inner diameter of ￠45m and a bottom flow corridor of 1.8x2.0m. The two thickening tanks adopt reinforced concrete structure, with an inner diameter of ￠24m and a bottom flow corridor of 1.8x2.0m.

[0149] 8.4 Tailings sand separation pump station

[0150] The bottom flow of the thickener is pressurized through the tailings sand separation pump station and sent to the tailings dewatering workshop.

[0151] The tailings sludge separation pump station is underground, ￠7.5m, and has a reinforced concrete structure.

[0152] The pump station is equipped with the following equipment:

[0153] a. 4 50ZBG-530B slurry pumps, 2 in operation and 2 on standby, with frequency conversion device. Performance parameters of clean water delivery: Q = 33.2m 3 / h, H=38.1m, N=15kW.

[0154] b. Two ZJL40-19 submersible slurry pumps, one for operation and one for standby. Performance parameters: Q = 14.6m 3 / h, H=13.1m, N=2.2kW.

[0155] c. The tailings separation pump station is equipped with one CD-2 electric monorail trolley with a lifting capacity of 2t and N=4.5Kw.

[0156] Slurry pump control of tailings sand separation pump station

[0157] The slurry pump adopts frequency conversion control according to the changes in the bottom flow concentration of the thickening tank. The bottom flow concentration, flow rate and overflow water quality detection signals of the thickening tank are sent to the control room and the general dispatching room of the concentrator.

[0158] Plant-wide emergency pool

[0159] The plant accident pool collects wastewater from each workshop at ordinary times and stores the system process slurry when the tailings sludge conveying system fails or the main plant fails. The plant accident pool is equipped with a temporary submersible sewage pump to send the wastewater to the tailings sludge thickening pool for treatment.

[0160] The accident pool of the whole plant is built with rubble stone.

[0161] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A quartz sand beneficiation and purification process, characterized in that: The steps include: S100, the raw ore is subjected to coarse crushing, medium crushing and fine crushing in sequence, the screen-surface product after fine crushing is returned to the fine crushing to form a closed circuit, and the screen-surface product after fine crushing is the fine crushing product; S200, the finely crushed product flows by gravity into the drum screen after grinding in the rod mill for primary inspection and screening, the screened material after the primary inspection and screening flows by gravity into the desludging bucket for primary desludging, the product after the primary desludging flows by gravity into the obstructed sedimentation machine for primary classification, the fine-grained material after the obstructed sedimentation flows by gravity into the drum screen for secondary inspection and screening, the screened material after the secondary inspection and screening flows by gravity into the desludging bucket for secondary desludging, the product after the secondary desludging flows by gravity into the hydraulic classifier for secondary classification, and fine sand and magnetic separation sand are obtained after the secondary classification; S300, sequentially subjecting the magnetically separated sand to weak magnetic separation, first-stage strong magnetic separation and second-stage strong magnetic separation, removing the iron-containing substances and dehydrating to obtain concentrated sand; S400, pickling the concentrated sand, deacidifying the pickled concentrated sand, washing the deacidified concentrated sand until it is neutral, dehydrating and drying the washed concentrated sand, grinding it, and sieving it to obtain glass sand and ultrafine silicon powder, respectively.

2. The quartz sand beneficiation and purification process according to claim 1, characterized in that: In step S200: The oversize products after primary screening and secondary screening and the coarse particles obtained by hindered sedimentation flow into the rod mill for re-grinding, forming a closed-circuit grinding. The fine mud obtained after the primary and secondary desludging is concentrated by a high-efficiency thickener, and then dehydrated to obtain dry ore mud.

3. The quartz sand beneficiation and purification process according to claim 1, characterized in that: In step S300: The iron-containing materials removed in the weak magnetic separation, the first stage strong magnetic separation and the second stage strong magnetic separation are dehydrated to obtain the iron-containing magnetic tailings.

4. The quartz sand beneficiation and purification process according to claim 1, characterized in that: In step S400: The specific method of pickling the concentrated sand includes the following: adding hydrochloric acid to the concentrated sand, dynamically reacting at a temperature of 75-90 degrees for 3-6 hours, and then deacidifying.

5. The quartz sand beneficiation and purification process according to claim 1, characterized in that: In step S400: The deacidified concentrated sand is washed in the following manner: the deacidified concentrated sand is sent to a water washing device for primary washing and secondary washing until the concentrated sand is neutral.

6. The quartz sand beneficiation and purification process according to claim 1, characterized in that: In step S400: The deacidified concentrated sand is washed, and the wastewater generated during the dehydration of the washed concentrated sand is treated. The specific treatment methods include: S500, after the wastewater is introduced into the regulating tank, the regulating tank adjusts the water level of the wastewater through the liquid level control device and the raw water delivery pump; S510, the wastewater in the regulating tank flows into the first reaction tank, and H2SO4 solution or NaOH solution is added to the first reaction tank according to the pH value; S520, the effluent from the reaction tank overflows into the coagulation tank through the overflow port, and H2SO4 solution or NaOH solution is added to the coagulation tank according to the pH value, and PAC and defluorination agent are added at the same time; S530, the effluent from the coagulation tank overflows into the coagulation tank through the overflow port, and a PAM polymer coagulant is added into the coagulation tank; S540, the effluent from the coagulation tank passes through the diversion trough and the high-efficiency sedimentation tank for gravity sedimentation. The supernatant in the high-efficiency sedimentation tank enters the water production tank through the overflow weir and is discharged after meeting the standards.

7. A quartz sand beneficiation and purification process according to claim 6, characterized in that: In step S540: The sludge at the bottom of the high-efficiency sedimentation tank is transported to the sludge thickening tank by a sludge pump for mud-water separation. The sludge at the bottom of the sludge thickening tank is transported to the filter press by a sludge pump for filtration and dehydration. The filtrate obtained from the sludge thickening tank is returned to the regulating tank through the drain pipe.

8. The quartz sand beneficiation and purification process according to claim 7, characterized in that: Mechanical stirring devices are arranged in the reaction tank, the coagulation tank and the flocculation tank.

9. The quartz sand dressing and purification process according to claim 8, characterized in that: The H2SO4 solution is stored in the H2SO4 storage tank, and the solution in the H2SO4 storage tank is added to each medication point through a metering pump; the NaOH solution is stored in the NaOH storage tank, and the solution in the NaOH storage tank is added to each medication point through a metering pump; the PAC solution is stored in the PAC storage tank, and the solution in the PAC storage tank is added to each medication point through a metering pump; the PAM solution is stored in the PAM storage tank, and the solution in the PAM storage tank is added to each medication point through a metering pump; the defluorinator is stored in the defluorinator storage tank, and the solution in the defluorinator storage tank is added to each medication point through a metering pump; The H2SO4 storage tank, NaOH storage tank, PAC storage tank, PAM storage tank and defluorination agent storage tank are all equipped with liquid level control devices, which will sound an alarm when the liquid level is low.

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