CN116143128B - Process method and device for purifying quartz sand by multi-step linkage three-phase flow pickling - Google Patents

Process method and device for purifying quartz sand by multi-step linkage three-phase flow pickling Download PDF

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CN116143128B
CN116143128B CN202310450797.4A CN202310450797A CN116143128B CN 116143128 B CN116143128 B CN 116143128B CN 202310450797 A CN202310450797 A CN 202310450797A CN 116143128 B CN116143128 B CN 116143128B
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quartz sand
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CN116143128A (en
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王昶
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Lifeng Silicon Technology Tianjin Co ltd
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Lifeng Silicon Technology Tianjin Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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    • C01P2004/60—Particles characterised by their size
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

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  • Cleaning By Liquid Or Steam (AREA)

Abstract

The invention belongs to the field of high-purity quartz sand purification, and relates to a multi-step linkage three-phase flow pickling process method and a device thereof, wherein quartz sand with purity of 99.6-99.8% and granularity of 120-40 meshes is selected, and quartz sand to be washed is respectively placed into a first pickling tank and a second pickling tank … … Nth pickling tank; and discharging quartz sand in each pickling tank from the bottom of the pickling tank after the quartz sand is subjected to pickling for a plurality of times to reach the required purity, wherein the concentration of pickling solution for the first time is the lowest, and the concentration of pickling solution for the last time is the highest. The bottom of the pickling tank is connected with an air inlet pipeline, and compressed gas is led in through the air inlet pipeline to form a gas-solid-liquid upward mixed flow. The quartz sand pickling and purifying method adopts in-situ treatment, so that the energy consumption required by transferring a large amount of quartz sand is saved. The reverse acid washing is adopted, the acid washing driving force is improved, the purity of quartz sand is gradually improved, and the purity can reach 99.99% -99.999%.

Description

Process method and device for purifying quartz sand by multi-step linkage three-phase flow pickling
Technical Field
The invention belongs to the field of high-purity quartz sand purification, and particularly relates to a multi-step linkage three-phase flow pickling quartz sand purification process method and device.
Background
The high-purity quartz sand has unique physical and chemical properties, so that the high-purity quartz sand plays a very important role in aviation, aerospace, electronics, machinery and the IT industry which is rapidly developed nowadays, and particularly has the inherent molecular chain structure, crystal shape and lattice change rule, so that the high-purity quartz sand has the advantages of high temperature resistance, small thermal expansion coefficient, high insulation, corrosion resistance, piezoelectric effect, resonance effect and unique optical properties, and plays an increasingly important role in a plurality of high-tech products.
At present, the quartz sand is mainly purified by an acid washing method, and the chemical composition of impurity components in mineral substances is changed by acid dissolution, so that the impurity components and useful components are separated, and the purification effect is achieved.
CN211004594U discloses a pickling device for high-purity quartz sand, comprising a first pickling tank, a second pickling tank, a third pickling tank, a first washing tank, a second washing tank and a third washing tank, wherein the bottoms of the first pickling tank, the second pickling tank and the third pickling tank are provided with ultrasonic vibration plates. This acid dip pickle of high purity quartz sand utilizes the belt to convey quartz sand, the charging frame is placed 1 hour in first pickling tank, then the lifting is filled the frame and is dried 10 minutes, remaining liquid in the quartz sand fully flows out and returns the below pickling tank, then open the motor and once convey the charging frame to appointed position, it gets into second pickling tank in proper order to fill the frame, the third pickling tank, first washing tank, second washing tank and third washing tank, the operation that gets into among them all can continuous carry out pickling and washing with getting into in the first pickling tank the same, and utilize ultrasonic wave shake board vibration to drive quartz sand and the better contact of acid energy.
Although the continuous acid washing of the quartz sand can be realized, the quartz sand needs to be moved from one acid washing tank to another acid washing tank, and the transferring energy consumption is high; and because quartz sand is heavy in weight, the ultrasonic vibration can promote contact of the quartz sand and acid to a certain extent, but has limited effect.
How to save energy and reduce emission, low cost and improve pickling efficiency is a technical problem to be solved by the application.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a multi-step linkage three-phase flow pickling quartz sand purification process method and device, which greatly reduce energy consumption and save energy.
The technical scheme adopted for solving the technical problems is as follows:
the invention provides a multi-step linkage three-phase flow pickling quartz sand purification process method, which comprises the steps of selecting quartz sand with purity of 99.6-99.8% and granularity of 120-40 meshes, and respectively placing quartz sand to be washed into a first pickling tank and a second pickling tank … … Nth pickling tank, wherein N is more than or equal to 3; discharging quartz sand in each pickling tank from the bottom of the pickling tank after the quartz sand is subjected to pickling for a plurality of times to reach the required purity, wherein the concentration of pickling solution for the first time is the lowest, and the concentration of pickling solution for the last time is the highest; the pickling solution is conveyed by a pipeline and a pump, and is controlled by a valve to enter one pickling tank into the other pickling tank;
the pickling tank adopts a jet fluidized bed, the upper part is cylindrical, the lower part is conical, the bottom of the pickling tank is connected with an air inlet pipeline, compressed gas is introduced through the air inlet pipeline to form a gas-solid-liquid upward mixed flow, surrounding pickling solution and quartz sand can flow downwards by means of self gravity to form a very stable circulation, the pickling solution and the quartz sand flow under the circulation all the time, and the contact between the pickling solution and the quartz sand and the collision and friction between the pickling solution and the quartz sand are accelerated; the quartz sand, the pickling solution and the air form a jet fluidized bed technology, three-phase substances form the largest three-phase speed difference under the jet action, and form an integral circulation, so that the acid liquor and the particulate matters have better contact and scrubbing processes.
When the concentration of the pickling solution is lower than the set value, the pickling solution is introduced into a reverse osmosis device to produce pure water for preparing the pickling solution.
Further, the pickling solution is sulfuric acid solution, and the initial concentration is 5-10wt%.
The second aspect of the invention provides a process device for realizing the process method, which comprises a plurality of pickling units, a net filtering particle conveying belt, a cleaning water collecting tank, an initial concentration pickling solution storage tank, a pickling solution conveying pipe and a reverse osmosis separation device, wherein the pickling solution conveying pipe comprises a pickling solution conveying main pipe and a plurality of pickling solution conveying branch pipes, the pickling solution conveying main pipe is connected with the initial concentration pickling solution storage tank, and control valves are arranged on the pickling solution conveying main pipe and the plurality of pickling solution conveying branch pipes; a plurality of pickling units are arranged above the mesh-filter particle conveyor belt, and a cleaning water collecting tank is arranged below the mesh-filter particle conveyor belt;
the pickling units are respectively a first pickling unit and a second pickling unit … … Nth pickling unit, N is more than or equal to 3, and each pickling unit comprises:
the top of the pickling tank is provided with a sand inlet and a liquid inlet, the liquid inlet is connected with the pickling liquid conveying branch pipe, the bottom of the pickling tank is provided with two outlets, the first outlet is formed at the bottom of the cone and is connected with two pipelines which are respectively an air inlet pipeline and a sand discharge pipeline, an air pump and an air inlet valve are arranged on the air inlet pipeline, and a sand discharge valve is arranged on the sand discharge pipeline; the second outlet is arranged on the side wall and is connected with a liquid discharge pipeline, a liquid discharge valve is arranged on the liquid discharge pipeline, and a quartz sand filter plate is arranged at the second outlet;
the inlet of the storage tank is connected with the liquid discharge pipeline, the storage tank is provided with an outlet, the outlet is connected with a pickling liquid conveying branch pipe, and a pickling liquid conveying pump is arranged on the pickling liquid conveying branch pipe;
and a water sprayer arranged above the net filtering particle conveyer belt.
Further, an outlet line of the wash water collection tank is connected to an inlet of the reverse osmosis separation device.
Further, an inlet of the reverse osmosis separation device is connected with one of the pickling liquid conveying branch pipes.
Further, the quartz sand filter plate is a quartz sand sintering plate, and the aperture is smaller than the minimum granularity of quartz sand particles.
The multi-step linkage three-phase flow pickling quartz sand purification process can select three-step, four-step or five-step processes according to the purity of quartz sand flotation, and is characterized in that pickling tanks are combined, quartz sand in the pickling tanks is kept motionless in the pickling process, pickling liquid is only moved, and energy consumption required by quartz sand conveying and moving after the pickling tanks are connected in series is reduced. The pickling solution is converted from high concentration step by step to downward flow, the pickling stock solution is contacted with quartz sand which is pickled for several times and has less impurity content, the pickling driving force is improved, after the pickling solution reaches the requirement, the pickling solution is discharged, then the quartz sand is discharged again, enters the bottom of a screen filter conveyor belt, is sprayed with water and is washed again by pure water, and finally, a quartz sand product with clean appearance and extremely low impurity content can be obtained; the pickle liquor after pickling is directly discharged into a storage tank at the bottom of the pickling tank, and the concentration of sulfuric acid is relatively reduced at the moment, and only part of sulfate (Al 2 (SO 4 ) 3 、Fe 2 (SO 4 ) 3 、TiSO 4 、CaSO 4 MgSO 4 Etc.) are used as pickling solutions of the next pickling tank, and the multi-step linkage pickling process is realized by inferior class pushing.
Each pickling unit is a relatively independent pickling device, and the process is formed by linkage of four identical units as can be seen from reference to a process diagram; the upper part of the pickling tank is cylindrical, the lower part of the pickling tank is conical, quartz sand with different purities is placed in the standing tank, dilute sulfuric acid solution is placed in the tank, the liquid level is higher than the quartz sand, then the bottom of the tank is aerated, the air flow forms upward discharge flow, a negative pressure space is formed in the jet orifice, the quartz sand and the dilute acid are easily entrained by the air flow and flow from bottom to top, a gas-solid-liquid upward mixed flow is formed, the speed of the gas is higher than the speed of the liquid is higher than the speed of the solid, the liquid film on the surface of the liquid-solid becomes thinner due to speed difference, particles collide and rub with each other, the mass transfer resistance of hydrogen ions and metal ions in the water film becomes smaller, the quartz sand is continuously contacted with the dilute acid solution, the dissociation of the hydrogen ions to the metal oxide is accelerated, and the chemical reaction of the dilute acid and impurities on the surface of the quartz sand is promoted, as shown in a chemical reaction equation (1), wherein M is expressed as metal, and the impurity metal oxide is converted into metal ions and water under the action of the hydrogen ions.
H + + MxOy =Mn + + H 2 O (1)
(Mn + : Fe 3+ 、Al 3+ 、Ti 2+ 、Ca 2+ 、Mg 2+ )
In the practical process of pickling, the pickling tank is not static, after all, is an acidolysis reaction between liquid and solid, the concentration difference of hydrogen ions on the solid-liquid surface depends on the thickness of a liquid film, if in a static state, the pushing force is small, therefore, the three-phase flow pickling technology is provided, in order to facilitate three-phase flow pickling, the pickling tank is specially made into a conical bottom, air flow is ejected from the bottom to form a jet three-phase fluidized bed, quartz sand and liquid flow from bottom to top under the action of the impact of the air flow by virtue of the negative pressure generated by the air flow, the contact state of the quartz sand surface and the liquid is completely changed, the thickness of the liquid film of a solid-liquid interface is greatly reduced, the resistance of hydrogen ion mass transfer is reduced, and the upward flowing speeds of three media of three-phase flow are not the same, so that the three-phase flow is truly cleaned. In the continuous process of the whole pickling tank, the pickling liquid and the quartz sand form stable circulation, so that the pickling is promoted, and the pickling efficiency is improved. The last stage of pickling uses the stock solution of pickling sulfuric acid, namely, the quartz sand which is obtained by flotation is added, the relative impurity content is higher, the pickling solution which is pickled before is used, the low-concentration pickling solution is fully utilized to carry out preliminary contact with the quartz sand with high relative impurity concentration, after the completion, the discharged pickling solution is directly sent to the next reverse osmosis device to obtain high-purity water again, and the high-purity water is used for preparing a sulfuric acid solution and cleaning products which reach requirements after pickling, wherein the step of cleaning is to clean residual impurity ions on the surface of the quartz sand, and ensure the high quality of the products.
The invention has the advantages and positive effects that:
the quartz sand pickling and purifying method adopts in-situ treatment, that is, once the quartz sand is fed, the quartz sand is completed in the original pickling tank, so that the energy consumption required by transferring a large amount of quartz sand is saved.
The invention adopts reverse acid washing, improves the pushing force of acid washing, gradually improves the purity of quartz sand, and can reach 99.99% -99.999%.
The jet flow gas forms three-phase flow of gas, liquid and solid, quartz stone forms circulation in the pickling tank from top to bottom, and then under the action of the air flow, the contact between the pickling liquid and quartz sand and the collision and friction between the quartz sand are accelerated, the mass transfer resistance of a liquid film on a solid-liquid interface is reduced, and the chemical reaction of hydrogen ions and oxide impurities is promoted.
The pure water after reverse osmosis separation can be directly recycled to the system to prepare dilute sulfuric acid solution.
Drawings
FIG. 1 is a schematic diagram of a process flow for purifying quartz sand by multi-step linkage three-phase flow pickling according to an embodiment of the invention.
FIG. 2 is a schematic diagram of acid transfer.
The marks in the figure: the device comprises a first pickling tank 1, a second pickling tank 2, a third pickling tank 3, a fourth pickling tank 4, an initial concentration pickling tank 5, a reverse osmosis separation device 6, a pickling liquid conveying main pipe 7, a pickling liquid conveying branch pipe 8, a liquid discharge valve 9, a liquid discharge pipeline 10, a fourth storage tank 11, a water sprayer 12, a cleaning water collecting tank 13, a filter screen type conveying belt 14, a sand discharge pipeline 15, an air pump 16, a sand discharge valve 17, an air inlet valve 18, an air inlet pipeline 19, a third storage tank 20, a second storage tank 21 and a first storage tank 22.
Description of the embodiments
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless otherwise indicated.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The pickling solution adopted in the embodiment is 5-10wt% sulfuric acid solution, and compressed air enters from the bottom of the pickling tank. Quartz sand with purity of 99.6-99.8% and granularity of 120-40 mesh is selected.
As shown in fig. 1, the four-step linkage three-phase flow pickling quartz sand purification process flow schematic diagram comprises a plurality of pickling units, a filter screen type conveying belt 14, a cleaning water collecting tank 13, an initial concentration pickling solution storage tank 5, a pickling solution conveying pipe and a reverse osmosis separation device 6, wherein the pickling solution conveying pipe comprises a pickling solution conveying main pipe 7 and a plurality of pickling solution conveying branch pipes 8, the pickling solution conveying main pipe 7 is connected with the initial concentration pickling solution storage tank 5, and control valves are arranged on the pickling solution conveying main pipe 7 and the plurality of pickling solution conveying branch pipes 8; a plurality of pickling units are installed above the screen type conveyor 14, and a washing water collecting tank 13 is installed below the screen type conveyor 14;
the pickling units are respectively a first pickling unit and a second pickling unit … … Nth pickling unit, N is more than or equal to 3, and each pickling unit comprises: the pickling tank adopts a jet fluidized bed, the top of the pickling tank is provided with a sand inlet and a liquid inlet, the liquid inlet is connected with the pickling liquid conveying branch pipe 8, the bottom of the pickling tank is provided with two outlets, wherein the first outlet is formed at the bottom of a cone, the first outlet is connected with two pipelines which are respectively an air inlet pipeline 19 and a sand discharge pipeline 15, the air inlet pipeline 19 is provided with an air pump 16 and an air inlet valve 18, and the sand discharge pipeline 15 is provided with a sand discharge valve 17; the second outlet is arranged on the side wall and is connected with a drain pipeline 10, a drain valve 9 is arranged on the drain pipeline 10, and a quartz sand filter plate is arranged at the second outlet; the inlet of the storage tank is connected with the liquid discharge pipeline 10, the storage tank is provided with an outlet, the outlet is connected with a pickling liquid conveying branch pipe 8, and a pickling liquid conveying pump is arranged on the pickling liquid conveying branch pipe 8; the water sprayer 12 is installed above the screen type conveyor 14. The outlet line of the wash water collection tank 13 is connected to the inlet of the reverse osmosis separation device 6. The inlet of the reverse osmosis separation device 6 is connected with a pickling liquid conveying branch pipe 8.
The discharge of pickling solution is a key technology for continuous growth, and the invention installs a quartz sand filter plate at the second outlet, wherein the quartz sand filter plate is a quartz sand sintering plate, and the aperture is smaller than the minimum granularity of quartz sand particles. A drain valve 9 is arranged on a drain pipeline 10, the hardness of quartz sand is fully utilized, and when the pickling process is finished, the valve is opened, so that the pickling solution can automatically flow out through water pressure.
Quartz sand to be washed is respectively put into a first pickling tank 1, a second pickling tank 2, a third pickling tank 3 and a fourth pickling tank 4. Quartz sand in each pickling tank is subjected to pickling for a plurality of times, wherein the concentration of pickling solution for the first time is the lowest, and the concentration of pickling solution for the last time is the highest.
The fourth pickling tank 4 after four-step reverse pickling is firstly closed by the air pump 16 and the air inlet valve 18, then the liquid discharge valve 9 at the lower part of the fourth pickling tank 4 is opened, the pickling solution passes through the quartz sand sintering plate connected with the pickling tank through the second outlet, and is gradually discharged into the fourth storage tank 11 under the action of gravity until the pickling solution is discharged, and then the liquid discharge valve 9 is closed.
Then, the sand discharge valve 17 of the fourth pickling tank 4 is opened, quartz sand with little pickling liquid flows into the filter screen type conveyor belt 14 from top to bottom, and pure water treated by a reverse osmosis process is used for washing, so that the ultra-high purity quartz sand with the concentration of 99.99% -99.999% can be obtained.
Then the sand discharge valve 17 is closed, the top feed inlet of the fourth pickling tank 4 is opened, and the quartz sand after flotation is put in. When a certain amount is reached, the feed is stopped.
During the above operation of the fourth pickling tank 4, the air pump is turned off at the same time as the other three pickling tanks, and then the liquid discharge valve is opened to discharge the pickling liquids into the storage tanks below the respective pickling tanks in accordance with the method of the fourth pickling tank 4.
At this time, the quartz sand in the first pickling tank 1, the second pickling tank 2, and the third pickling tank 3 remains in the pickling tanks, the quartz sand in the third pickling tank 3 has been subjected to three pickling, the quartz sand in the second pickling tank 2 has been subjected to secondary pickling, and the quartz sand in the first pickling tank 1 has been subjected to primary pickling.
The purity of the quartz sand in the third pickling tank 3 is more than that in the second pickling tank 2 is more than that in the first pickling tank 1 is more than that in the fourth pickling tank 4.
The concentration of the pickling solution in the fourth tank 11 > the concentration of the pickling solution in the third tank 20 > the concentration of the pickling solution in the second tank 21 > the concentration of the pickling solution in the first tank 22.
As shown in fig. 2, the raw acid pumped from the original concentration pickling tank 5 is pumped into the third pickling tank 3, the pickling solution in the third tank 20 is pumped into the first pickling tank 1, the pickling solution in the fourth tank 11 is pumped into the second pickling tank 2, the pickling solution in the second tank 21 is pumped into the fourth pickling tank 4, the pickling solution in the first tank 22 has a low concentration, and the impurity metal ions in the quartz sand are pickled and then enter an aqueous phase solution, and the solution is directly sent to the reverse osmosis separation device 6 to recover pure water, and water for disposing sulfuric acid solution, water for washing and the like are supplied.
As long as the pickling solution is injected into the pickling tank, aeration can be performed, a jet fluidized bed technology is utilized to form a three-phase fluidized bed from quartz sand, the pickling solution and gas, and the sufficient contact between the quartz sand and the pickling solution is realized by utilizing the fluidization speed difference of different substances to form continuous circulation, so that the quartz sand and the violent turbulence of the quartz sand and the liquid are continuously disturbed.
And acidometer is arranged on the pickling liquid conveying main pipe 7 and the pickling liquid conveying branch pipe 8, so that the concentration of the pickling liquid is detected, the purity of quartz sand in each pickling tank is combined, the pickling liquid is input into the corresponding pickling tank through a PLC control valve after conversion, and the pickling concentration is ensured to be higher than that of the last pickling.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A multi-step linkage three-phase flow pickling quartz sand purification process method is characterized in that quartz sand with purity of 99.6-99.8% and granularity of 120-40 meshes is selected, and quartz sand to be washed is respectively placed into a first pickling tank (1) and a second pickling tank (2) … … Nth pickling tank, wherein N is more than or equal to 3; discharging quartz sand in each pickling tank from the bottom of the pickling tank after the quartz sand is subjected to pickling for a plurality of times to reach the required purity, wherein the concentration of pickling solution for the first time is the lowest, and the concentration of pickling solution for the last time is the highest; the pickling solution is conveyed by a pipeline and a pump, and is controlled by a valve to enter one pickling tank into the other pickling tank;
the pickling tank adopts a jet fluidized bed, the upper part is cylindrical, the lower part is conical, the bottom of the pickling tank is connected with an air inlet pipeline (19), compressed gas is introduced through the air inlet pipeline (19) to form a gas-solid-liquid upward mixed flow, so that the contact of pickling liquid and quartz sand and the collision and friction between the pickling liquid and the quartz sand are accelerated;
when the concentration of the pickling solution is lower than the set value, the pickling solution is introduced into a reverse osmosis device to produce pure water for preparing the pickling solution.
2. The process according to claim 1, wherein the pickling solution is a sulfuric acid solution with an initial concentration of 5-10wt%.
3. A process device for realizing the process method according to claim 1, which is characterized by comprising a plurality of pickling units, a filter screen type conveyor belt (14), a cleaning water collecting tank (13), an initial concentration pickling solution storage tank (5), a pickling solution conveying pipe and a reverse osmosis separation device (6), wherein the pickling solution conveying pipe comprises a pickling solution conveying main pipe (7) and a plurality of pickling solution conveying branch pipes (8), the pickling solution conveying main pipe (7) is connected with the initial concentration pickling solution storage tank (5), and control valves are arranged on the pickling solution conveying main pipe (7) and the plurality of pickling solution conveying branch pipes (8); a plurality of pickling units are arranged above the filter screen type conveyor belt (14), and a cleaning water collecting tank (13) is arranged below the filter screen type conveyor belt (14);
the pickling units are respectively a first pickling unit and a second pickling unit … … Nth pickling unit, N is more than or equal to 3, and each pickling unit comprises:
the top of the pickling tank is provided with a sand inlet and a liquid inlet, the liquid inlet is connected with the pickling liquid conveying branch pipe (8), the bottom of the pickling tank is provided with two outlets, the first outlet is formed at the bottom of a cone and is connected with two pipelines which are an air inlet pipeline (19) and a sand discharge pipeline (15) respectively, the air inlet pipeline (19) is provided with an air pump (16) and an air inlet valve (18), and the sand discharge pipeline (15) is provided with a sand discharge valve (17); the second outlet is arranged on the side wall and is connected with a liquid discharge pipeline (10), a liquid discharge valve (9) is arranged on the liquid discharge pipeline (10), and a quartz sand filter plate is arranged at the second outlet;
the inlet of the storage tank is connected with the liquid discharge pipeline (10), the storage tank is provided with an outlet, the outlet is connected with a pickling liquid conveying branch pipe (8), and a pickling liquid conveying pump is arranged on the pickling liquid conveying branch pipe (8);
and a water sprayer (12) installed above the screen type conveyor belt (14).
4. A process unit according to claim 3, characterized in that the outlet line of the wash water collection tank (13) is connected to the inlet of the reverse osmosis separation unit (6).
5. A process unit according to claim 3, characterized in that the inlet of the reverse osmosis separation unit (6) is connected to one of the pickle liquor transport branches (8).
6. A process unit according to claim 3, wherein the quartz sand filter plate is a quartz sand sinter plate having a pore size smaller than the minimum particle size of the quartz sand particles.
CN202310450797.4A 2023-04-25 2023-04-25 Process method and device for purifying quartz sand by multi-step linkage three-phase flow pickling Active CN116143128B (en)

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CN115090604B (en) * 2022-07-18 2023-10-24 徐州水处理研究所 Continuous-production-line type large-scale acid-washing low-iron quartz sand production device

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