A quartz sand vacuum purification device and a method of using the same

Abstract

A quartz sand vacuum purification device and a method for using the same, the device comprising a purification furnace for purifying quartz sand and a power assembly for driving the furnace body to rotate along the axis of the furnace body, the purification furnace comprising a furnace body with constant temperature heating function and a vacuum pump and an acid gas generator in communication with the interior of the furnace body, the vacuum pump and the acid gas generator are started in sequence to circulate, so that the pressure of the furnace body can be circulated from low to high, when the pressure of the furnace body changes from low to high, the quartz sand located in the interior of the furnace body can produce a breathing effect, the vacuum pump is started to reduce the pressure of the furnace body, and the low pressure makes the gas in the gap of the quartz sand be extracted, the acid gas generator injects acid gas into the interior of the furnace body, which can make the pressure in the interior of the furnace body rise, with the rise of the pressure, the gap of the quartz sand can be retracted, at the same time of the gap retraction, the injected acid gas is sucked into the gap of the quartz sand, so that the acid gas can corrode the impurities in the quartz sand, and the quartz sand can be purified to 99.99999% through multiple cycles.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of quartz sand purification, in particular to a quartz sand vacuum purification device and a use method thereof. BACKGROUND

[0002] High-purity quartz sand is a granular quartz product with SiO2 content of more than 99.9% after physical (crushing, heating, etc.) and chemical (acid leaching, alkali leaching, etc.) treatment of quartz ore, and has wide application in many fields such as semiconductors, aerospace, optical communication, photovoltaics, etc. Quartz sand is mainly purified by existing technologies such as acid leaching and alkali leaching, and the main principle is to dissolve the impurities in the quartz sand through chemical reaction, and then separate and obtain high-purity quartz sand by filtering, washing and other steps. But the acid leaching and alkali leaching technologies can only corrode and purify the surface of the quartz sand, and it is difficult to remove the deep impurities inside the quartz sand, so it cannot meet the requirement of purifying high-purity quartz sand to 99.9999% purity, and cannot meet the quality requirement of ultra-high-purity quartz sand in high-end application fields. SUMMARY

[0003] The purpose of the present application is to solve the above technical problems and deficiencies, and to provide a quartz sand vacuum purification device and a use method thereof, which can purify high-purity quartz sand to 99.9999% purity and meet the quality requirement of ultra-high-purity quartz sand in high-end application fields.

[0004] To solve the above technical problems and deficiencies, the technical solution adopted by the present application is: a quartz sand vacuum purification device, comprising a purification furnace for purifying quartz sand and a power assembly for driving the furnace body to rotate along its axis, the purification furnace comprising a furnace body with constant temperature heating function, and a vacuum pump and an acid gas generator communicating with the inside of the furnace body.

[0005] As a further optimization of the quartz sand vacuum purification device of the present application, a heating belt is provided on the periphery of the furnace body, and a temperature sensor is provided between the heating belt and the furnace body.

[0006] As a further optimization of the quartz sand vacuum purification device of the present application, a supporting plate is provided below the furnace body, bearings are fixedly provided on both ends of the periphery of the furnace body, and the outer circle of the bearings is fixed on the supporting plate.

[0007] As a further optimization of the quartz sand vacuum purification device of the present application, a supporting rod is provided on the outer circle of the bearings, and the end of the supporting rod away from the bearings is fixedly connected with the supporting plate.

[0008] As a further optimization of the quartz sand vacuum purification device of the present application, the power assembly comprises a motor, a gear and a gear ring, the gear ring is provided on one end of the periphery of the furnace body, the motor is provided on the supporting plate, the gear is concentrically connected with the output shaft of the motor, and the gear ring is drivingly connected with the gear through a rack.

[0009] As a further optimization of the quartz sand vacuum purification device, the material of the furnace body is steel.

[0010] As a further optimization of the quartz sand vacuum purification device, the upper edge of the supporting plate is provided with a protective fence to prevent high-temperature contact, and the purification furnace is located inside the protective fence.

[0011] As a further optimization of the quartz sand vacuum purification device, the protective fence includes two U-shaped frames, the open ends of the two U-shaped frames are respectively connected to the two ends of the upper edge of the supporting plate, and a plurality of railings are arranged between the two U-shaped frames.

[0012] A method for using a quartz sand vacuum purification device, which utilizes the above-mentioned purification device to purify quartz sand, comprising the following steps:

[0013] 1) Fill the quartz sand into the furnace body, heat the inside of the furnace body, and keep the internal temperature of the furnace body at 140-240 degrees;

[0014] 2) While keeping the temperature constant, the furnace body is driven to rotate by the power assembly;

[0015] 3) While the furnace body is rotating, the inside of the furnace body is vacuumed by the vacuum pump;

[0016] 4) After the vacuuming of the inside of the furnace body is completed, the acid gas generator is used to inject acid gas into the inside of the furnace body to increase the pressure inside the furnace body;

[0017] 5) Circulate steps 3) and 4) to continuously circulate the pressure inside the furnace body between 2200-94000 Pa;

[0018] 6) After the purification of the quartz sand is completed, the quartz sand is taken out from the furnace body.

[0019] As a further optimization of the method for using the quartz sand vacuum purification device, the internal temperature of the furnace body in step 2) is kept at 220 degrees.

[0020] The present application has the following advantages:

[0021] The application can make the pressure of the furnace body cycle from low to high by sequentially circulating the vacuum pump and the acid gas generator, and can make the quartz sand in the furnace body produce the breathing effect when the pressure of the furnace body changes from low to high. The vacuum pump is started to reduce the pressure of the furnace body, and the low pressure makes the gas in the gap of the quartz sand be extracted. The acid gas generator injects acid gas into the furnace body to make the pressure of the furnace body rise, and the gap of the quartz sand is retracted with the increase of the pressure. At the same time of the gap retraction, the injected acid gas is absorbed into the gap of the quartz sand, so that the acid gas can corrode the impurities in the quartz sand. After multiple cycles, the quartz sand can be purified to 99.99999%. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a side view structure diagram of the purification device of the application Figure 1 ;

[0023] Figure 2 is a side view structure diagram of the purification device of the application Figure 2 ;

[0024] The drawings show that: 1, the supporting plate, 2, the purification furnace, 201, the furnace body, 202, the vacuum pump, 203, the acid gas generator, 205, the heating belt, 206, the bearing, 207, the supporting rod, 3, the power assembly, 301, the motor, 302, the rack, 303, the gear, 304, the gear ring, 4, the protective fence, 401, the U-shaped frame, 402, the fence. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application.

[0026] As Figures 1-2As shown, the present application provides a quartz sand vacuum purification device, which comprises a purification furnace 2 for purifying quartz sand and a power assembly 3 for driving the furnace body 201 to rotate along the axis direction of the furnace body 201. The purification furnace 2 comprises a furnace body 201 with constant temperature heating function, a vacuum pump 202 and an acid gas generator 203 in communication with the inside of the furnace body 201. By filling quartz sand into the inside of the furnace body 201, the vacuum pump 202 and the acid gas generator 203 are started in turn, so that the pressure of the furnace body 201 can be cycled from low to high. When the pressure of the furnace body 201 changes from low to high, the quartz sand inside the furnace body 201 can produce a breathing effect. The vacuum pump 202 is started to reduce the pressure of the furnace body 201, and the low pressure causes the gas inside the quartz sand gap to be extracted. The acid gas generator 203 injects acid gas into the inside of the furnace body 201 to increase the pressure of the furnace body 201. With the increase of the pressure, the quartz sand gap can be retracted. At the same time of the gap retraction, the injected acid gas is sucked into the inside of the quartz sand gap, so that the acid gas can corrode the impurities inside the quartz sand. After multiple cycles, the quartz sand can be purified to 99.99999%.

[0027] In order to prevent the inner wall of the furnace body 201 from being corroded by acid gas, a polytetrafluoroethylene coating and a quartz sand coating are applied to the inside of the furnace body 201. The polytetrafluoroethylene coating is located between the quartz sand coating and the inner wall of the furnace body 201. The polytetrafluoroethylene coating prevents the acid gas from corroding the inner wall of the furnace body 201. The quartz sand coating prevents the quartz sand inside the furnace body 201 from wearing away the polytetrafluoroethylene coating.

[0028] In order to make the furnace body 201 have constant temperature heating function, a heating belt 205 is provided around the furnace body 201 to heat the furnace body. In order to facilitate the control of the temperature inside the furnace body 201, a temperature sensor is provided between the heating belt 205 and the furnace body 201 to monitor the temperature of the furnace body 201 in real time, so that the heating temperature of the furnace body 201 is constant. The constant temperature heating of the furnace body 201 can keep the acid gas injected into the inside of the furnace body 201 in a dry steam state, avoiding the acid gas from being liquefied by cold, and the density of the liquefied acid liquid is greater than the gap, which is not conducive to the acid gas entering the inside of the quartz sand gap. In order to improve the thermal performance of the furnace body 201, the material of the furnace body 201 is steel.

[0029] In order to make the furnace body 201 rotate along the axis direction of the furnace body 201, a supporting plate 1 is provided below the furnace body 201. Bearings 206 are fixedly provided around the two ends of the furnace body 201. The circumference of the bearing 206 is provided with a supporting rod 207. The end of the supporting rod 207 away from the bearing 206 is fixedly connected with the supporting plate 1. The furnace body 201 can rotate through the bearing 206, and the furnace body 201 can rotate along the axis direction of the furnace body 201 through the power assembly 3.

[0030] The power assembly 3 comprises a motor 301, a gear 303 and a gear ring 304, the gear ring 304 is sleeved on the one end of the circumferential side of the furnace body 201, the motor 301 is arranged on the supporting plate 1, the gear 303 is concentrically connected with the output shaft of the motor 301, and the gear ring 304 is in meshing transmission connection with the gear 303 through the rack 302. By controlling the rotation of the motor 301, the gear 303 is driven to rotate, the gear 303 is in meshing transmission connection with the gear ring 304 through the rack 302, and the rotation of the gear 303 can drive the furnace body 201 to rotate.

[0031] The power assembly 3 drives the furnace body 201 to rotate, so that the quartz sand in the furnace body 201 can be turned over, thereby making the quartz sand uniformly heated, avoiding the quartz sand accumulated in the lower part of the furnace body 201, and the tumbling of the furnace body 201 is beneficial to the contact between the quartz sand accumulated at the bottom of the quartz sand and the acid gas, thereby avoiding the uneven contact and poor purification effect of the quartz sand.

[0032] The heating of the heating belt 205 makes the temperature of the furnace body 201 rise, in order to avoid the worker being scalded by the furnace body 201, the protective fence 4 for preventing high-temperature contact is arranged on the upper edge of the supporting plate 1, and the purification furnace 2 is located in the inside of the protective fence 4.

[0033] The protective fence 4 comprises two U-shaped frames 401, the open ends of the two U-shaped frames 401 are connected with the two ends of the upper edge of the supporting plate 1 respectively, and a plurality of railings 402 are arranged between the two U-shaped frames 401.

[0034] The embodiment also provides a use method of the quartz sand vacuum purification device, the quartz sand is purified by using the above purification device, and the method specifically comprises the following steps:

[0035] 1) the quartz sand is filled into the inside of the furnace body 201, the inside of the furnace body 201 is heated, and the inside temperature of the furnace body 201 is kept at 140-240 degrees, preferably 220 degrees, so that the furnace body 201 is kept at constant temperature, and the subsequent purification operation is facilitated;

[0036] 2) while keeping the temperature of the furnace body 201 constant, the furnace body 201 is driven to rotate by the power assembly 3;

[0037] 3) while the furnace body 201 rotates, the inside of the furnace body 201 is vacuumized by the vacuum pump 202, so that the inside environment of the furnace body 201 is in a low-pressure state, and the suction of the vacuum pump can make the gas in the gap of the quartz sand discharged;

[0038] 4) after the vacuumization of the inside of the furnace body 201 is completed, the acid gas is injected into the inside of the furnace body 201 by the acid gas generator 203, so as to increase the pressure in the inside of the furnace body 201, the increase of the pressure in the inside environment of the furnace body 201 can make the gap of the quartz sand shrink, and the acid gas is sucked into the gap of the quartz sand at the same time, so as to corrode the impurities in the quartz sand;

[0039] 5) Circulating steps 3) and 4), the pressure inside the furnace body 201 is constantly circulated between 2200-94000 Pa, in the process of pressure circulation, the pressure inside the furnace body 201 will stay between the highest and lowest value for a period of time, when the pressure of the furnace body 201 changes from high to low, it will make the quartz sand inside the furnace body 201 produce breathing effect, vacuum pumping pressure can make the gas inside the gap of quartz sand exhaust, the acid gas generator 203 starts to inject acid gas into the furnace body 201, the injection of acid gas can make the pressure inside the furnace body 201 rise, the pressure rise can make the gap of quartz sand shrink, at the same time of shrinking, the acid gas is sucked into the gap of quartz sand, thereby corroding the impurities inside the quartz sand, multiple circulation, can make the quartz sand purification to 99.99999%;

[0040] 6) After the quartz sand purification is completed, the quartz sand is taken out from the furnace body 201.

[0041] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the specific implementation described above, and those skilled in the art can make various modifications or modifications within the scope of the claims, which does not affect the essential content of the present application.

Claims

1. A method for vacuum purification of quartz sand, characterized by, The quartz sand is purified by a purification device, the purification device comprises a purification furnace (2) for purifying the quartz sand and a power assembly (3) for driving the furnace body (201) to rotate along the axis direction of the furnace body (201), the purification furnace (2) comprises a furnace body (201) with constant temperature heating function and a vacuum pump (202) and an acid gas generator (203) in communication with the inside of the furnace body (201), comprising the following steps: 1) fill the quartz sand into the inside of the furnace body (201), heat the inside of the furnace body (201), and keep the inside temperature of the furnace body (201) between 140-240 degrees; 2) while keeping the temperature constant, the furnace body (201) is driven to rotate by the power assembly (3); 3) while the furnace body (201) is rotating, the inside of the furnace body (201) is vacuumized by the vacuum pump (202); 4) after the inside of the furnace body (201) is vacuumized, the acid gas generator (203) is used to inject acid gas into the inside of the furnace body (201) to increase the pressure in the inside of the furnace body (201); 5) the steps 3) and 4) are cycled to keep the pressure in the inside of the furnace body (201) between 2200-94000 Pa; 6) after the quartz sand is purified, the quartz sand is taken out from the furnace body (201).

2. The method of claim 1, wherein: In the step 2), the inside temperature of the furnace body (201) is kept at 220 degrees.

3. The method of claim 1, wherein: The periphery of the furnace body (201) is sleeved with a heating belt (205), and a temperature sensor is arranged between the heating belt (205) and the furnace body (201).

4. The method of claim 1, wherein: A supporting plate (1) is arranged below the furnace body (201), bearings (206) are fixedly sleeved on the periphery of both ends of the furnace body (201), and the outer circles of the bearings (206) are fixed on the supporting plate (1).

5. The method of claim 4, wherein: Supporting rods (207) are arranged on the outer circles of the bearings (206), and one ends of the supporting rods (207) away from the bearings (206) are fixedly connected with the supporting plate (1).

6. The method of claim 4, wherein: The power assembly (3) comprises a motor (301), a gear (303) and a gear ring (304), the gear ring (304) is sleeved on the periphery of one end of the furnace body (201), the motor (301) is arranged on the supporting plate (1), the gear (303) is concentrically connected with the output shaft of the motor (301), and the gear ring (304) is in meshing transmission connection with the gear (303) through a rack (302).

7. The method of claim 1, wherein: The material of the furnace body (201) is steel.

8. The method of claim 4, wherein: The upper edge of the supporting plate (1) is provided with a protective fence (4) for preventing high-temperature contact, and the purification furnace (2) is located in the inside of the protective fence (4).

9. The method of claim 8, wherein: The protective fence (4) comprises two U-shaped frames (401), the opening ends of the two U-shaped frames (401) are connected with the upper edges of both ends of the supporting plate (1), and a plurality of railings (402) are arranged between the two U-shaped frames (401).

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