Acid washing device for high-purity quartz sand production

Abstract

The utility model relates to high -purity quartz sand production equipment technical field, concretely is a kind of pickling device for high -purity quartz sand production, including jar body, motor is fixedly connected with the top of jar body, the output end of motor is connected with main shaft transmission, main shaft extends to inside through the top of jar body, main shaft is fixedly connected with stirring vane on it, main shaft upper portion is fixedly connected with stirring arm, bottom is fixedly connected with scraper, the bottom of jar body is fixedly connected with the baffle that central recesses downward, the outer bottom of jar body is provided with water ring, one side of jar body is provided with acid circulating tank, acid circulating tank is fixedly connected with acid pump on it, the input end of acid pump is fixedly connected with water supply pipe, the output end of acid pump is fixedly connected with water pipe, the other end of water pipe is communicated with water ring, the upper portion of jar body is communicated with acid circulating tank by backwater pipe, the utility model forms the effect of circularly turning over by the form of scraper and from bottom to top circulating impact into acid, enhances acid liquid permeability, reduces pickling dead angle, improves pickling efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of high-purity quartz sand production equipment, specifically an acid washing device for high-purity quartz sand production. Background Technology

[0002] Quartz sand is quartz particles processed from quartz stone through crushing, screening, and other processes. The core of high-purity quartz sand production is to remove impurities (such as metal oxides, feldspar, mica, etc.) from quartz ore using physical and chemical methods, ultimately achieving a SiO2 purity of ≥99.99% or even higher. The production process includes raw material crushing and screening, roasting and water quenching, physical purification, chemical purification, and post-treatment. Among these, the main chemical purification processes are acid washing and chlorination roasting. Currently, most acid washing equipment relies on mechanical stirring to increase the contact effect between quartz sand and acid, removing metal oxides from the quartz sand through chemical dissolution. However, due to the high density of quartz sand, it often settles at the bottom during acid washing. Therefore, the acid washing effect on the quartz sand deposited at the bottom of the acid washing tank is not ideal, and it is usually necessary to increase the acid washing time to ensure the acid washing effect. Therefore, further improvements to the acid washing equipment are needed to improve the acid washing efficiency. Utility Model Content

[0003] To address the above technical problems, this utility model provides an acid washing device for the production of high-purity quartz sand.

[0004] To solve the above-mentioned technical problems, the present invention provides an acid washing device for producing high-purity quartz sand, comprising a tank body. A feed pipe is fixedly connected to the top of the tank body, and a discharge pipe is fixedly connected to the bottom. A discharge valve is installed on the discharge pipe. A motor is fixedly connected to the top of the tank body, and the output end of the motor is driven by a main shaft. The main shaft extends inward through the top of the tank body, and a stirring blade is fixedly connected to the main shaft. A stirring arm is fixedly connected to the upper part of the main shaft, and a scraper is fixedly connected to the bottom. A centrally recessed area is fixedly connected to the bottom of the tank body. The tank has a partition with several through holes. The lowest point of the partition is connected to the discharge pipe. A water inlet ring is provided at the bottom of the tank body. The water inlet ring is connected to the bottom of the tank body through several pipes. An acid circulation tank is provided on one side of the tank body. An acid pump is fixedly connected to the acid circulation tank. The input end of the acid pump is fixedly connected to a water supply pipe that extends into the acid circulation tank. The output end of the acid pump is fixedly connected to a water inlet pipe. The other end of the water inlet pipe is connected to the water inlet ring. The upper part of the tank body is connected to the acid circulation tank through a return water pipe.

[0005] Furthermore, a heating tube is provided at the bottom of the acid circulation tank.

[0006] Furthermore, an acid return pipe is provided at the top of the acid circulation tank.

[0007] Furthermore, the acid circulation tank is also equipped with an acid mixing port at the top.

[0008] Furthermore, a valve is also installed on the water supply pipe.

[0009] Furthermore, the mesh size of the partition is 150-200 mesh.

[0010] Furthermore, a support leg is fixedly connected to the bottom of the tank.

[0011] This utility model has the following advantages compared with the prior art:

[0012] This invention utilizes a rotating scraper at the bottom, combined with an upward circulating acid injection system, to create a turbulent effect. This enhances the acid's penetration into the bottom deposits, reduces dead zones in the pickling process, and ensures effective pickling while significantly reducing pickling time and improving efficiency. Furthermore, the spiral stirring blades lift any quartz sand accumulated in the center during stirring, ensuring full contact between all the quartz sand and the pickling solution. Finally, a heating pipe at the bottom of the acid circulation tank maintains the temperature of the circulating acid, providing suitable conditions for the reaction and further improving pickling efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] In the diagram: 1. Tank body, 2. Motor, 3. Main shaft, 4. Stirring blade, 5. Stirring arm, 6. Scraper, 7. Baffle, 8. Feed pipe, 9. Discharge pipe, 10. Water ring, 11. Discharge valve, 12. Acid circulation tank, 13. Acid pump, 14. Water supply pipe, 15. Water supply pipe, 16. Water return pipe, 17. Acid return pipe, 18. Heating pipe, 19. Valve, 20. Acid mixing port, 21. Support leg. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] like Figure 1The illustrated pickling device for producing high-purity quartz sand includes a tank 1. A feed pipe 8 is fixedly connected to the top of the tank 1, and a discharge pipe 9 is fixedly connected to the bottom. A discharge valve 11 is installed on the discharge pipe 9. A motor 2 is fixedly connected to the top of the tank 1, and a main shaft 3 is driven to the output end of the motor 2. The main shaft 3 extends inward through the top of the tank 1 and is rotatably connected to the tank 1. A spiral stirring blade 4 is fixedly connected to the main shaft 3. A stirring arm 5 is fixedly connected to the upper part of the main shaft 3, and a scraper 6 is fixedly connected to the bottom. A centrally recessed partition 7 is fixedly connected to the bottom of the tank 1. The distance between the scraper 6 and the partition 7 is... The partition plate 7, which is no more than 20 cm long, has several tiny through holes. The lowest point of the partition plate 7 is connected to the discharge pipe 9 for easy discharge. A water ring 10 is provided at the bottom of the tank body 1. The water ring 10 is connected to the bottom of the tank body 1 through several pipes. An acid circulation tank 12 is provided on one side of the tank body 1. An acid pump 13 is fixedly connected to the acid circulation tank 12. A water supply pipe 15 is fixedly connected to the input end of the acid pump 13 and extends into the acid circulation tank 12. A water supply pipe 14 is fixedly connected to the output end of the acid pump 13. The other end of the water supply pipe 14 is connected to the water ring 10. The upper part of the tank body 1 is connected to the acid circulation tank 12 through a return water pipe 16.

[0017] To provide favorable conditions for the reaction, a heating tube 18 is installed at the bottom of the acid circulation tank 12.

[0018] In order to recover and reuse the acid solution that has been separated by centrifugal dehydration or gravity sedimentation, the acid circulation tank 12 is equipped with an acid return pipe 17 at the top.

[0019] To meet the needs of some processes for removing impurities such as iron and aluminum, the acid circulation tank 12 is also equipped with an acid addition port 20 at the top, which facilitates the addition of oxalic acid (concentration 10%) and hydrofluoric acid (concentration 1%) to enhance the removal effect of impurities such as iron and aluminum, and also facilitates timely adjustment of acid concentration according to the impurity content in different batches of quartz sand.

[0020] To prevent backflow of liquid material during discharge, a valve 19 is also installed on the water supply pipe 14.

[0021] To prevent quartz sand from falling to the bottom of tank 1, the mesh size of baffle 7 is 150-200 mesh.

[0022] To facilitate equipment placement, support legs 21 are also fixedly connected to the bottom of the tank 1.

[0023] It should be noted that the heating tube 18 in this embodiment is an electric heating tube. In order to increase the life of the equipment, the inside of the pickling equipment can be coated with an anti-corrosion coating (such as ZS-1033 hydrofluoric acid resistant anti-corrosion coating).

[0024] The working process of this embodiment is as follows:

[0025] First, prepare the pickling solution using a mixture of hydrochloric acid (HCl), hydrofluoric acid (HF), and sulfuric acid (H2SO4) in a ratio of hydrochloric acid:nitric acid:sulfuric acid = 1000:2:2 (mass ratio). For some special types of quartz sand, oxalic acid (10% concentration) and hydrofluoric acid (1% concentration) need to be added to enhance the removal effect on iron and aluminum impurities. Then, turn on the heating tube 18 to heat the pickling solution to 60~80℃, and continuously monitor the temperature with a thermometer during the subsequent pickling cycle to ensure the reaction temperature conditions are met. After the pickling solution is prepared, add high-pressure water-washed quartz sand particles into tank 1 through the feed pipe 8 to avoid contamination of the pickling solution by mud and loose impurities. Then, start the acid pump 13 to continuously deliver the pickling solution into tank 1 from all directions at the bottom of tank 1. After adding an appropriate amount of pickling solution... Start motor 2. Motor 2 drives stirring blade 4, stirring rod 5, and scraper 6 to continuously stir the quartz sand particles. When the pickling liquid level reaches the connection between the return water pipe 16 and the tank 1, the pickling liquid will circulate back to the pickling circulation tank through the return water pipe 16. During this period, the pickling liquid continuously enters from the bottom of the tank 1 and passes upward through the perforated baffle 7, continuously impacting the quartz sand particles at the bottom. With the help of the scraper 6 at the bottom, the quartz sand at the bottom can fully contact the pickling liquid to ensure the pickling effect. After pickling for 3 to 6 hours, turn off the acid pump 13 and motor 2, close valve 19, and open the discharge valve 11 to transport the quartz sand particles and acid liquid to the next separation process. Use centrifugal dehydration or gravity sedimentation to separate the quartz sand and acid liquid. The residual acid liquid is recovered to the acid circulation tank 12 through the acid return pipe 17, and the quartz sand enters the rinsing stage.

Claims

1. A pickling device for producing high-purity quartz sand, comprising a tank (1), wherein a feed pipe (8) is fixedly connected to the top of the tank (1) and a discharge pipe (9) is fixedly connected to the bottom, and a discharge valve (11) is provided on the discharge pipe (9), characterized in that: A motor (2) is fixedly connected to the top of the tank (1). The output end of the motor (2) is connected to a main shaft (3). The main shaft (3) extends inward through the top of the tank (1). A stirring blade (4) is fixedly connected to the main shaft (3). A stirring arm (5) is fixedly connected to the upper part of the main shaft (3), and a scraper (6) is fixedly connected to the bottom. A centrally recessed partition (7) is fixedly connected to the bottom of the tank (1). Several through holes are provided on the partition (7). The lowest point of the partition (7) is connected to the discharge pipe (9). An upper water ring is provided at the bottom of the tank (1). 10), the water ring (10) is connected to the bottom of the tank (1) through several pipes. An acid circulation tank (12) is provided on one side of the tank (1). An acid pump (13) is fixedly connected to the acid circulation tank (12). A water supply pipe (15) is fixedly connected to the input end of the acid pump (13) and extends into the acid circulation tank (12). A water supply pipe (14) is fixedly connected to the output end of the acid pump (13). The other end of the water supply pipe (14) is connected to the water ring (10). The upper part of the tank (1) is connected to the acid circulation tank (12) through a return water pipe (16).

2. The acid washing device for producing high-purity quartz sand according to claim 1, characterized in that: A heating tube (18) is provided at the bottom of the acid circulation tank (12).

3. The acid washing device for producing high-purity quartz sand according to claim 1, characterized in that: The acid circulation tank (12) is equipped with an acid return pipe (17) at the top.

4. The acid washing device for producing high-purity quartz sand according to claim 1, characterized in that: The acid circulation tank (12) is also provided with an acid dispensing port (20) at the top.

5. The acid washing device for producing high-purity quartz sand according to claim 1, characterized in that: A valve (19) is also installed on the water supply pipe (14).

6. The acid washing apparatus for producing high-purity quartz sand according to claim 1, characterized in that: The mesh size of the partition (7) is 150-200 mesh.

7. The acid washing apparatus for producing high-purity quartz sand according to claim 1, characterized in that: The bottom of the tank (1) is also fixedly connected to a support leg (21).

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