Quartz sand calcining device

Abstract

The utility model belongs to the technical field of quartz sand pretreatment, and particularly discloses a quartz sand calcining device which comprises a calcining box, a stirring mechanism is arranged in the calcining box, a heating layer is fixedly connected to the inner wall of the calcining box, a storage tank is fixedly connected to the upper end of a feeding port, and an air inlet and an air outlet are formed in the top of the calcining box. The lower end of the air outlet is fixedly connected with a filter screen, the upper end of the air outlet is communicated with a heat exchange pipe through a pipeline, the heat exchange pipe is wound on the outer side of the storage tank, the output end of the heat exchange pipe is communicated with a smoke treatment mechanism, the output end of the smoke treatment mechanism is fixedly connected with an induced draft fan, and the smoke treatment mechanism and the induced draft fan are both fixedly connected with the top of the calcining box. According to the utility model, the storage tank and the heat exchange tube are arranged, so that waste heat generated by calcining in the calcining box can be introduced into the heat exchange tube, quartz sand materials in the storage tank are preheated through the heat exchange tube, the waste heat in flue gas is fully utilized, then the flue gas is treated and discharged, and the waste of heat energy is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of quartz sand pretreatment, and specifically relates to a quartz sand calcination device. Background Technique

[0002] Quartz sand is quartz particles obtained by crushing quartz stone. It is a hard, wear-resistant, and chemically stable silicate mineral. The main mineral component is silicon dioxide. It is an important industrial mineral raw material. With the development of science and technology, especially the accelerating replacement of modern electronic consumer products, the rapid development of electric light sources, optoelectronic communications, large-scale and ultra-large-scale integrated circuits, especially the photovoltaic industry, the demand for high-quality high-purity quartz sand has increased sharply, and it is required that the silicon dioxide content be greater than 99.99%, or even higher.

[0003] Before use, quartz sand needs to be pretreated to improve its purity. Among them, the method of calcination is used to remove the moisture and volatile impurities in the quartz sand to ensure the dryness and purity of the quartz sand. During the calcination process of quartz sand, a large amount of waste heat will be generated. If this waste heat is directly discharged, it will cause waste of energy. If the flue gas containing waste heat is directly drawn back into the equipment, a lot of waste chips will be doped in the gas, resulting in the purity of the quartz sand being affected. Therefore, it is necessary to design a quartz sand calcination device that can utilize the waste heat of calcination. Content of the Utility Model

[0004] In view of the above technical problems, the utility model provides a quartz sand calcination device that can utilize the waste heat of calcination.

[0005] To solve the above technical problems, the technical solution of the utility model is: a quartz sand calcination device, including a calcination box. The top of the calcination box is provided with a feed inlet, and the bottom is provided with a discharge outlet. Discharge valves are installed on both the feed inlet and the discharge outlet. The outer bottom of the calcination box is fixedly connected with support legs. A stirring mechanism is arranged inside the calcination box. The inner wall of the calcination box is fixedly connected with a heating layer. The upper end of the feed inlet is fixedly connected with a storage tank. The top of the calcination box is provided with an air inlet and an air outlet. The lower end of the air outlet is fixedly connected with a filter screen, and the upper end is connected to a heat exchange pipe through a pipeline. The heat exchange pipe is wound around the outside of the storage tank. The output end of the heat exchange pipe is connected to a flue gas treatment mechanism. The output end of the flue gas treatment mechanism is fixedly connected with an induced draft fan. Both the flue gas treatment mechanism and the induced draft fan are fixedly connected to the top of the calcination box.

[0006] Further, the stirring mechanism includes a stirring motor and a stirring paddle. The stirring motor is fixedly connected to the top of the calcination box. The stirring paddle is located inside the calcination box and the upper end is fixedly connected to the output end of the stirring motor.

[0007] Further, the flue gas treatment mechanism includes a treatment box and an activated carbon layer. The lower end of the treatment box is fixedly connected to the top of the calcination box through a support frame. The output end of the heat exchange tube is fixedly connected to the upper end of the treatment box. The lower end of the treatment box is fixedly connected to the input end of the induced draft fan. A perforated plate is fixedly connected in the treatment box and arranged parallel up and down. The activated carbon layer is placed on the perforated plate. A maintenance door is hinged on the side wall of the treatment box at a position corresponding to the activated carbon layer.

[0008] Further, heat insulation layers are provided on the outer sides of the calcination box and the storage tank.

[0009] Further, high-frequency electric heating tubes are arranged in the heating layer.

[0010] The utility model has the following advantages compared with the prior art:

[0011] 1. By setting the storage tank and the heat exchange tube, the waste heat generated by calcination in the calcination box can be introduced into the heat exchange tube. The quartz sand material in the storage tank is preheated through the heat exchange tube. After fully utilizing the waste heat in the flue gas, the flue gas is treated and then discharged, reducing the waste of heat energy. The preheated quartz sand can also reduce the heating time, further improving the working efficiency of quartz sand calcination treatment.

[0012] 2. By opening a maintenance door on the treatment box of the flue gas treatment mechanism, it is convenient for operators to maintain and replace the activated carbon layer therein; by wrapping heat insulation layers around the calcination box and the storage tank conformally, heat loss can be reduced, further reducing energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the utility model.

[0014] In the figure: 1. Calcination box, 2. Feed inlet, 3. Discharge outlet, 4. Support leg, 5. Stirring mechanism, 51. Stirring motor, 52. Stirring paddle, 6. Heating layer, 7. Air inlet, 8. Air outlet, 9. Storage tank, 10. Filter screen, 11. Heat exchange tube, 12. Flue gas treatment mechanism, 121. Treatment box, 122. Activated carbon layer, 13. Induced draft fan, 14. High-frequency electric heating tube. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The following will further illustrate the utility model with reference to the drawings.

[0016] As Figure 1A quartz sand calcination device shown in the figure includes a calcination box 1. There is a feed inlet 2 at the top of the calcination box 1 and a discharge outlet 3 at the bottom. Discharge valves are installed on both the feed inlet 2 and the discharge outlet 3. A support leg 4 is fixedly connected to the outer bottom of the calcination box 1. A stirring mechanism 5 is arranged inside the calcination box 1. A heating layer 6 is fixedly connected to the inner wall of the calcination box 1. A storage tank 9 is fixedly connected to the upper end of the feed inlet 2. An air inlet 7 and an air outlet 8 are opened at the top of the calcination box 1. A filter screen 10 is fixedly connected to the lower end of the air outlet 8. The filter screen can prevent quartz sand or dust from entering the air outlet 8. The upper end of the air outlet 8 is connected to a heat exchange tube 11 through a pipeline. The heat exchange tube 11 is wound around the outside of the storage tank 9. The output end of the heat exchange tube 11 is connected to a flue gas treatment mechanism 12. The output end of the flue gas treatment mechanism 12 is fixedly connected to an induced draft fan 13. Both the flue gas treatment mechanism 12 and the induced draft fan 13 are fixedly connected to the top of the calcination box 1.

[0017] In order to turn the quartz sand in the calcination box 1 and make the quartz sand evenly heated, the stirring mechanism 5 includes a stirring motor 51 and stirring paddles 52. The stirring motor 51 is fixedly connected to the top of the calcination box 1. The stirring paddles 52 are located inside the calcination box 1 and the upper end is fixedly connected to the output end of the stirring motor 51.

[0018] In order to treat the flue gas and waste gas generated by calcining quartz sand, the flue gas treatment mechanism 12 includes a treatment box 121 and an activated carbon layer 122. The lower end of the treatment box 121 is fixedly connected to the top of the calcination box 1 through a support frame. The output end of the heat exchange tube 11 is fixedly connected to the upper end of the treatment box 121. The lower end of the treatment box 121 is connected to the input end of the induced draft fan 13. A hole plate is fixedly connected inside the treatment box 121 and arranged parallel up and down. The activated carbon layer 122 is placed on the hole plate. A maintenance door is hinged at the corresponding position of the side wall of the treatment box 121 where the activated carbon layer 122 is located.

[0019] In order to play a heat preservation role and prevent the heat loss of the heat exchange tube 11 on the calcination box 1 and the storage tank 9, resulting in energy loss, heat preservation layers are arranged on the outside of both the calcination box 1 and the storage tank 9, and heat preservation cotton is filled in the heat preservation layers.

[0020] In order to heat and calcine the quartz sand in the calcination box 1, high-frequency electric heating tubes 14 are arranged in the heating layer 6.

[0021] The specific working process of the present utility model is as follows:

[0022] Open the discharge valve of the feed inlet 2 below the storage tank 9, and the preheated quartz sand enters the calcination box 1. Then close the discharge valve of the feed inlet 2, and add the quartz sand to be processed back into the storage tank 9. Start the stirring motor 51 to drive the stirring paddle 52 to rotate continuously and turn over the quartz sand. The high-frequency electric heating tube 14 in the heating layer 6 continues to work to calcine the quartz sand, separating the organic components and moisture in the quartz sand. Under the action of the induced draft fan 13, the external air flow enters the calcination box 1 from the air inlet 7. The flue gas generated by calcination in the calcination box 1 enters the heat exchange tube 11 from the air outlet 8 to heat and raise the temperature of the quartz sand to be processed in the storage tank 9. The flue gas after heat exchange enters the treatment box 121 and is harmlessly treated successively through two activated carbon layers 122, and then is discharged through the induced draft fan 13. Finally, open the discharge valve on the discharge port 3 to discharge the calcined quartz sand, and start the next calcination work again according to the above steps.

Claims

1. A quartz sand calcining device, comprising a calcining box (1), wherein the calcining box (1) has a feed inlet (2) at the top and a discharge outlet (3) at the bottom, wherein discharge valves are installed on the feed inlet (2) and the discharge outlet (3), and a support leg (4) is fixedly connected to the outer bottom of the calcining box (1), characterized in that: The calcining box (1) is provided with a stirring mechanism (5), the inner wall of the calcining box (1) is fixedly connected to a heating layer (6), the upper end of the feed port (2) is fixedly connected to a storage tank (9), the top of the calcining box (1) is provided with an air inlet (7) and an air outlet (8), the lower end of the air outlet (8) is fixedly connected to a filter screen (10), and the upper end is connected to a heat exchange tube (11) through a pipeline, the heat exchange tube (11) is wound around the outside of the storage tank (9), the output end of the heat exchange tube (11) is connected to a flue gas treatment mechanism (12), the output end of the flue gas treatment mechanism (12) is fixedly connected to an induced draft fan (13), and the flue gas treatment mechanism (12) and the induced draft fan (13) are both fixedly connected to the top of the calcining box (1).

2. The quartz sand calcining device according to claim 1, characterized in that: The stirring mechanism (5) comprises a stirring motor (51) and a stirring paddle (52); the stirring motor (51) is fixedly connected to the top of the calcining box (1); the stirring paddle (52) is located inside the calcining box (1) and the upper end is fixedly connected to the output end of the stirring motor (51).

3. The quartz sand calcining device according to claim 1, characterized in that: The flue gas treatment mechanism (12) comprises a treatment box (121) and an activated carbon layer (122); the lower end of the treatment box (121) is fixedly connected to the top of the calcining box (1) via a support frame; the output end of the heat exchange tube (11) is fixedly connected to the upper end of the treatment box (121); the lower end of the treatment box (121) is fixedly connected to the input end of the induced draft fan (13); a perforated plate arranged in parallel up and down is fixedly connected inside the treatment box (121); the activated carbon layer (122) is placed on the perforated plate; and a maintenance door is hingedly connected to a side wall of the treatment box (121) at a position corresponding to the activated carbon layer (122).

4. The quartz sand calcining device according to claim 1, characterized in that: The outer sides of the calcining box (1) and the material storage tank (9) are both provided with a heat-insulating layer.

5. The quartz sand calcining device according to claim 1, characterized in that: A high-frequency electric heating tube (14) is arranged in the heating layer (6).

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