CN111397377A

CN111397377A - Smelting device for preparing fused quartz and working method thereof

Info

Publication number: CN111397377A
Application number: CN202010126662.9A
Authority: CN
Inventors: 费恒虎
Original assignee: Xinyi Yinhe Quartz Material Co ltd
Current assignee: Xinyi Yinhe Quartz Material Co ltd
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2020-07-10
Anticipated expiration: 2040-02-28
Also published as: CN111397377B

Abstract

The invention discloses a smelting device for preparing fused quartz and a working method thereof, wherein the smelting device comprises an impurity removing furnace and a smelting furnace; the impurity removing furnace comprises a furnace body and a magnetic grid, wherein the magnetic grid is arranged outside the furnace body; the smelting furnace comprises a furnace shell, a heat preservation layer, a smelting chamber, a resistance wire, a second discharge hole, a second valve and an exhaust pipe, wherein the upper end of the smelting chamber is connected with the first discharge hole, the lower end of the smelting chamber is connected with the second discharge hole, the resistance wire is arranged on the inner wall of the smelting chamber, the heat preservation layer is arranged on the outer layer of the smelting chamber, the furnace shell is arranged on the periphery of the heat preservation layer, and the exhaust pipe penetrates through the furnace shell and the heat preservation layer to be connected. The smelting device for preparing the fused quartz has a reasonable structure, is safe and reliable, can be used for removing impurities from magnetic mineral substances in quartz sand, can be used for acid dissolution of some impurities in the quartz sand, can be used for smelting the quartz sand, realizes integration of magnetic separation, acid washing and smelting, and simultaneously prepares high-purity fused quartz.

Description

Smelting device for preparing fused quartz and working method thereof

Technical Field

The invention relates to the technical field of quartz sand smelting equipment, in particular to a smelting device for preparing fused quartz and a working method thereof.

Background

The quartz sand is a hard, wear-resistant and chemically stable silicate mineral, the main mineral component of the quartz sand is SiO2, the color of the quartz sand is milky white or colorless and semitransparent, the quartz sand has the hardness of 7, the quartz sand is brittle and non-cleavage, the quartz sand has a shell-shaped fracture, the gloss of grease is 2.65 in density, the bulk density (1-20 meshes are 1.6-1.8) and 20-200 meshes are 1.5, the quartz sand has obvious anisotropy in chemical, thermal and mechanical properties, is insoluble in acid, is slightly soluble in KOH solution and has a melting point of 1750 ℃.

Quartz materials play a very important role in the modern society, electronic components manufactured by processing quartz as a raw material are applied to various industries to promote the development of science and technology, the performance of the electronic components depends on the purity and the processing technology of the quartz raw material to a great extent, and in order to extract pure quartz from the quartz raw material, a smelting furnace is often adopted for calcination, fusion and purification. However, the purification of the smelting furnace is only to simply remove combustible impurities, other substances in the smelting furnace need to be purified through other process equipment, the quartz sand needs to be completely melted at a very high temperature, the quartz sand is conventionally melted and then cooled to be drawn into ingots for molding, a large amount of heat and energy are lost and wasted, and resource waste and environmental pollution are caused.

Summary of the invention

Aiming at the defects in the prior art, the invention provides the smelting device for preparing the fused quartz and the working method thereof, and through the ingenious design of the smelting device, the magnetic mineral in the quartz sand can be subjected to impurity removal, some impurities in the quartz sand can be subjected to acid dissolution, and the quartz sand can be smelted, so that the integration of magnetic separation, acid washing and smelting is realized, and the multifunctional effect of one device is realized.

In order to achieve the purpose, the invention is realized by the following technical scheme: a smelting device for preparing fused quartz comprises an impurity removing furnace and a smelting furnace; the impurity removing furnace comprises a furnace body and a magnetic grid, wherein a feeding port is formed in the upper end of the furnace body, a first discharging port is formed in the lower end of the furnace body, a first valve is arranged on the first discharging port, and the magnetic grid is arranged outside the furnace body; the smelting furnace comprises a furnace shell, a heat preservation layer, a smelting chamber, a resistance wire, a second discharge hole, a second valve and an exhaust pipe, wherein the upper end of the smelting chamber is connected with the first discharge hole, the lower end of the smelting chamber is connected with the second discharge hole, the resistance wire is arranged on the inner wall of the smelting chamber, the heat preservation layer is arranged on the outer layer of the smelting chamber, the furnace shell is arranged on the periphery of the heat preservation layer, and the exhaust pipe penetrates through the furnace shell and the heat preservation layer to be connected. The smelting device for preparing the fused quartz has reasonable structure, ingenious design, safety and reliability, and the magnetic grating in the device can be used for removing mineral substances in quartz sand, burning combustible substances such as phosphorus in the quartz sand through the heating resistance wire, discharging waste gas through the exhaust pipe and preparing the high-purity fused quartz.

Further, in the above smelting device for preparing fused quartz, a first pipeline and a second pipeline are arranged outside the exhaust pipe, the exhaust pipe is connected with the first pipeline and the second pipeline in a cross manner, and three reversing valves are arranged at the connection position; the first pipeline is tightly wound on the outer wall of the furnace body, and the first pipeline and the second pipeline are finally connected to an exhaust gas treatment system. The first pipeline is designed to heat the furnace body by utilizing the temperature of the waste gas, so that a good waste utilization effect is achieved. The three-way reversing valve is preferably an electric reversing valve, and the position of the switch can be well controlled through the three-way reversing valve. Finally, the first pipeline and the second pipeline are connected to an exhaust gas treatment system for exhaust gas treatment.

Further, foretell preparation fused silica's smelting device, be equipped with the third discharge gate on the furnace body, be equipped with the third valve on the third discharge gate, the third discharge gate is equipped with first filter screen, first filter screen is in before the third valve, be equipped with the agitator on the furnace body, the agitator includes puddler, stirring rake and agitator motor, connect the stirring rake under the puddler, go up and connect agitator motor, puddler and stirring rake are all established inside the furnace body, agitator motor establishes outside the furnace body, be equipped with temperature detect switch on the furnace body, temperature detect switch includes temperature sensor, temperature controller, temperature sensor inserts inside the furnace body, temperature controller with three switching-over valves are connected. The acid dip pickle that the design of third discharge gate can the edulcoration stove become, realize solid-liquid separation, the acid dip of quartz sand is that some materials in acid and quartz sand carry out chemical reaction, thereby further purification quartz sand, the acid dip reacts better under 30-45 ℃ of temperature, high temperature shines into acid explosion again easily, so need further control the temperature, temperature control that the ingenious design of temperature switch can be better, the use of stirring rake can make reaction temperature even, thereby better react, reach better edulcoration effect.

Furthermore, in the above smelting device for preparing fused quartz, a second filter screen is arranged between the second discharge port and the smelting chamber. The design of the second filter screen can realize solid-liquid separation between high-temperature infusible matters in the quartz sand and the fused quartz, and further purify the fused quartz.

Furthermore, in the above melting apparatus for preparing fused silica, the magnetic grid is spiral and is arranged outside the first pipeline, and the magnetic grid is not in contact with the furnace body. The magnetic grid and the first pipeline are provided with intervals to prevent the demagnetization of the magnetic grid caused by high temperature of the furnace body.

Further, in the above melting device for preparing fused silica, the space between the furnace shell and the heat-insulating layer is hollow. The furnace shell and the heat preservation layer are hollow, so that heat preservation can be further realized, the furnace shell can not be damaged, and meanwhile, personnel scalding caused by the shell can be prevented.

Furthermore, according to the smelting device for preparing the fused quartz, the first discharge hole is made of a heat insulating material, the furnace body is made of a corrosion-resistant material, the heat insulating layer is made of a heat insulating material, and the smelting chamber is made of a high-temperature refractory material.

Different materials play different roles, and first discharge gate material is the heat-insulating material, and preferred glass fiber heat-insulating material prevents that the high temperature in the smelting chamber from transmitting to the edulcoration indoor, and high temperature can make the in-process of pickling explode, still causes the demagnetization of magnetic screen simultaneously easily. The furnace body material is corrosion-resistant material, and the high temperature resistant acid resistance material of preferred carborundum plays anticorrosive effect when the pickling, and thermal insulation material's use reduces thermal loss, and resources are wasted, and high temperature refractory material is not melted under very high temperature, and the quartz that is used for holding the smelting that can be better.

Further, in the above melting device for preparing fused quartz, the heat insulating material comprises the following components in parts by weight: 30-40 parts of calcium silicate, 15-20 parts of sodium silicate, 40-45 parts of aerogel, 10-15 parts of vitrified micro bubbles, 10-20 parts of polybutene alcohol, 3-6 parts of nickel, 15-20 parts of carbon, 3-5 parts of white latex and 20-25 parts of magnesia. The heat-insulating material has high thermal stability and strength, good fireproof effect and obvious heat-insulating effect, and particularly, the heat loss can be greatly reduced by using the heat-insulating material.

Further, in the above melting apparatus for preparing fused silica, the high temperature refractory material comprises the following components in parts by weight: 50-60 parts of nano silicon dioxide, 20-25 parts of carbon fiber, 78-10 parts of TiO 25, 30-35 parts of glass fiber, 10-15 parts of silicon nitride, 3-5 parts of vinyl polydimethylsiloxane, 1-3 parts of stannous chloride, 25-30 parts of high-alumina balls and 210-15 parts of Na2O.2SiO210. The high-temperature refractory material has stable performance, excellent refractory performance, high-temperature corrosion resistance and the like, prolongs the service life of the refractory material, and has high strength, environmental protection, heat preservation, energy conservation and high temperature resistance.

The invention also provides a working method of the smelting device for preparing the fused quartz, which comprises the following steps: firstly, closing the first discharge port and the third discharge port, slowly adding quartz sand into the furnace body, wherein the furnace body has a magnetic field due to the relationship of a magnetic grid, magnetic mineral substances in the quartz sand are sucked away in the falling process of the quartz sand, nonmagnetic quartz sand falls to the bottom of the furnace body, then adding hydrochloric acid into the furnace body, turning on a power supply of a stirring device to start stirring of a stirring paddle, turning on a temperature control switch simultaneously, when the temperature in the furnace body is lower than 30 ℃, transmitting the temperature to a temperature controller by a temperature sensor, sending a switch command to three reversing valve control switches to turn on a first exhaust pipe and turn off a second exhaust pipe by the temperature controller, when the temperature in the furnace body is higher than 45 ℃, transmitting the temperature to the temperature controller by the temperature sensor, sending a switch command to the three reversing valve control switches to turn off the first exhaust pipe by the temperature controller, turning on the second exhaust pipe, controlling the pickling reaction temperature to be, after stirring for 1h, opening a third discharge port to realize solid-liquid separation, closing the third discharge port, adding water, stirring for 30min, and opening the third discharge port again to realize solid-liquid separation; after separation is completed, the first discharge port is opened, the quartz sand subjected to impurity removal falls into a smelting chamber, a heating resistance power switch is turned on, the temperature is increased to 1850 ℃ to heat the quartz sand to a molten state, the molten quartz is retained by a second filter screen to be infusible, and the second discharge port is opened to discharge through the second discharge port.

The smelting device for preparing the fused quartz has the advantages of reasonable structure, ingenious design and convenient application, and can be used for quickly and effectively preparing the high-purity fused quartz.

Drawings

FIG. 1 is a schematic structural view of a melting apparatus for producing fused silica according to the present invention;

FIG. 2 is a schematic view of a temperature controlled switch action conduit;

FIG. 3 is a schematic side view of the trash removal furnace;

FIG. 4 is a schematic structural view of a second discharge port;

FIG. 5 is a schematic structural view of a third discharge port;

in the figure, 1 an impurity removing furnace, 2 a smelting furnace, 3 a temperature control switch, 4 a stirring device, 5 three reversing valves, 6 an exhaust gas treatment system, 11 a furnace body, 12 a magnetic grid, 13 a feeding port, 14 a first discharging port, 15 a first valve, 16 a third discharging port, 17 a third valve, 18 a first filter screen, 21 a furnace shell, 22 a heat preservation layer, 23 a smelting chamber, 24 resistance wires, 25 a second discharging port, 26 a second valve, 27 an exhaust pipe, 28 a second filter screen, 31 a temperature sensor, 32 a temperature controller, 41 a stirring rod, 42 a stirring paddle, 43 a stirring motor, 271 a first pipeline and 272 a second pipeline.

Detailed Description

The invention is further illustrated by the accompanying drawings and specific examples.

Example 1

As shown in fig. 1, a melting apparatus for preparing fused silica includes an impurity removing furnace 1, a melting furnace 2; the impurity removing furnace 1 comprises a furnace body 11 and a magnetic grid 12, wherein the upper end of the furnace body 11 is provided with a feeding port 13, the lower end of the furnace body is provided with a first discharging port 14, the first discharging port 14 is provided with a first valve 15, and the magnetic grid 12 is arranged outside the furnace body 11; in addition, the smelting furnace 2 comprises a furnace shell 21, a heat insulation layer 22, a smelting chamber 23, a resistance wire 24, a second discharge hole 25, a second valve 26 and an exhaust pipe 27, further, the upper end of the smelting chamber 23 is connected with the first discharge hole 14, the lower end of the smelting chamber 23 is connected with the second discharge hole 25, in addition, the resistance wire 24 is arranged on the inner wall of the smelting chamber 23, the heat insulation layer 22 is arranged on the outer layer of the smelting chamber 23, the furnace shell 21 is arranged on the periphery of the heat insulation layer 22, and the exhaust pipe 27 penetrates through the furnace shell 21 and the heat insulation layer 22 to be connected.

In addition, as shown in fig. 2, a first pipeline 271 and a second pipeline 272 are arranged outside the exhaust pipe 27, the exhaust pipe 27 is connected with the first pipeline 271 and the second pipeline 272 in a cross manner, and three reversing valves 5 are arranged at the connection positions; the first pipeline 271 is tightly wound on the outer wall of the furnace body 11, and the first pipeline 271 and the second pipeline 272 are finally connected to the exhaust gas treatment system 6.

In addition, a third discharge hole 16 is formed in the furnace body 11, a third valve 17 is formed in the third discharge hole 16, a first filter screen 18 is arranged on the third discharge hole 16, and the first filter screen 18 is arranged in front of the third valve 17, as shown in fig. 5. Be equipped with agitator 4 on furnace body 11, agitator 4 includes puddler 41, stirring rake 42 and agitator motor 43, connecting stirring rake 42 under the puddler 41, go up and connect agitator motor 43, puddler 41 and stirring rake 42 are all established inside furnace body 11, agitator motor 43 establishes at the furnace body 11 outside, be equipped with temperature detect switch 3 on the furnace body 11, temperature detect switch 3 includes temperature sensor 31, temperature controller 32, temperature sensor 31 inserts inside furnace body 11, temperature controller 32 with three switching-over valves 5 are connected.

And a second filter screen 28 is arranged between the second discharge hole 25 and the smelting chamber 24, as shown in fig. 4.

Further, as shown in fig. 3, the magnetic grid 12 is spiral and is disposed outside the first pipe 271, and the magnetic grid 12 is not in contact with the furnace body 11. Besides, the space between the furnace shell 21 and the insulating layer 22 is hollow.

In addition, the first discharge hole 14 is made of a heat insulating material, the furnace body 11 is made of a corrosion-resistant material, the heat insulating layer 22 is made of a heat insulating material, and the smelting chamber 24 is made of a high-temperature refractory material.

In addition, the heat insulation material comprises the following components in parts by weight: 30 parts of calcium silicate, 15 parts of sodium silicate, 40 parts of aerogel, 10 parts of vitrified micro bubbles, 10 parts of polybutene alcohol, 3 parts of nickel, 15 parts of carbon, 3 parts of white latex and 20 parts of magnesia.

Further, the high-temperature refractory material comprises the following components in parts by weight:

50 parts of nano silicon dioxide, 20 parts of carbon fiber and TiO ₂5 parts of glass fiber 30 parts, silicon nitride 10 parts, vinyl polydimethylsiloxane 3 parts, stannous chloride 1 part, high-alumina ball 25 parts, and Na₂O.2SiO₂10 parts.

The working method of the smelting device for preparing the fused quartz comprises the following steps: the first discharge port 14 and the third discharge port 16 are closed firstly, the quartz sand is slowly added into the furnace body 11, because of the relationship of the magnetic grating 12, the furnace body 11 has a magnetic field, in the falling process of the quartz sand, the magnetic mineral substances in the quartz sand are sucked away, the nonmagnetic quartz sand falls to the bottom of the furnace body 11, hydrochloric acid is added into the furnace body 11, the stirring device is powered on to start the stirring paddle 4 for stirring, the temperature control switch 3 is simultaneously started, when the temperature in the furnace body 11 is lower than 30 ℃, the temperature sensor 31 transmits the temperature to the temperature controller 32, the temperature controller 32 sends a switch command to the three reversing valves 5 to control the switch to open the first discharge pipe 271 and close the second discharge pipe 272, when the temperature in the furnace body 11 exceeds 45 ℃, the temperature sensor 31 transmits the temperature to the temperature controller 32, the temperature controller 32 sends a switch command to the three reversing valves 5 to control the switch to close the first discharge pipe 271, opening a second exhaust pipe 272, controlling the acid washing reaction temperature to be 30-45 ℃, stirring for 1h, then opening a third discharge hole 16 to realize solid-liquid separation, closing the third discharge hole 16, adding water, stirring for 30min, and then opening the third discharge hole 16 again to realize solid-liquid separation; after the separation is finished, the first discharge port 14 is opened, the quartz sand after impurity removal falls into the smelting chamber 24, a heating resistance power switch is opened, the temperature is increased to 1850 ℃ to heat the quartz sand to a molten state, the molten quartz is retained by the second filter screen 28 to be infusible, the second discharge port 25 is opened, and the quartz sand is discharged through the second discharge port 25.

Example 2

The same as example 1 except for the difference between the insulating material and the high temperature refractory. The heat insulation material in the embodiment comprises the following components in parts by weight: 35 parts of calcium silicate, 17 parts of sodium silicate, 42 parts of aerogel, 13 parts of vitrified micro bubbles, 15 parts of polybutene alcohol, 4.5 parts of nickel, 17 parts of carbon, 4 parts of white latex and 23 parts of magnesia.

And the high-temperature refractory material comprises the following components in parts by weight: 55 parts of nano silicon dioxide, 23 parts of carbon fiber, 27 parts of TiO, 33 parts of glass fiber, 13 parts of silicon nitride, 4 parts of vinyl polydimethylsiloxane, 2 parts of stannous chloride, 27 parts of high-alumina ball and Na2O.2SiO213 parts.

Example 3

The same as example 1 except for the difference between the insulating material and the high temperature refractory. The heat insulation material in the embodiment comprises the following components in parts by weight: 40 parts of calcium silicate, 20 parts of sodium silicate, 45 parts of aerogel, 15 parts of vitrified micro bubbles, 20 parts of polybutene alcohol, 6 parts of nickel, 20 parts of carbon, 5 parts of white latex and 25 parts of magnesia.

In addition, the high-temperature refractory material comprises the following components in parts by weight: 60 parts of nano silicon dioxide, 25 parts of carbon fiber, 210 parts of TiO, 35 parts of glass fiber, 15 parts of silicon nitride, 5 parts of vinyl polydimethylsiloxane, 3 parts of stannous chloride, 30 parts of high-alumina balls and 215 parts of Na2O.2SiO215.

The performance of the heat insulating material and the high-temperature refractory material in the above examples was tested, and the test results are shown in tables 1 and 2:

performance of heat insulating material

High temperature refractory performance

The data in tables 1 and 2 show that the thermal insulation material and the high-temperature refractory material in the invention are superior to the existing materials. The heat insulation material has obvious heat insulation effect and can greatly reduce the loss of heat. The high-temperature refractory material also has good refractory effect, the refractory temperature can reach more than 3000 ℃, and the high-temperature refractory material has good refractory effect.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.

Claims

1. A smelting device for preparing fused quartz is characterized in that: comprises an impurity removing furnace (1) and a smelting furnace (2); the impurity removing furnace (1) comprises a furnace body (11) and a magnetic grid (12), wherein a feeding hole (13) is formed in the upper end of the furnace body (11), a first discharging hole (14) is formed in the lower end of the furnace body (11), a first valve (15) is arranged on the first discharging hole (14), and the magnetic grid (12) is arranged outside the furnace body (11); smelting furnace (2) are including stove shell (21), heat preservation (22), smelting chamber (23), resistance wire (24), second discharge gate (25), second valve (26) and blast pipe (27), smelt chamber (23) upper end and connect first discharge gate (14), second discharge gate (25) is connected to the lower extreme, resistance wire (24) are established on smelting chamber (23) inner wall, heat preservation (22) are established at smelting chamber (23) skin, stove shell (21) are established at heat preservation (22) periphery, blast pipe (27) pass stove shell (21) and heat preservation (22) and link to each other with smelting chamber (23).

2. The melting apparatus for producing fused silica according to claim 1, wherein: a first pipeline (271) and a second pipeline (272) are arranged outside the exhaust pipe (27), the exhaust pipe (27) is in cross connection with the first pipeline (271) and the second pipeline (272), and three reversing valves (5) are arranged at the connection positions; the first pipeline (271) is tightly wound on the outer wall of the furnace body (11), and the first pipeline (271) and the second pipeline (272) are finally connected to the waste gas treatment system (6).

3. The melting apparatus for producing fused silica according to claim 2, wherein: be equipped with third discharge gate (16) on furnace body (11), be equipped with third valve (17) on third discharge gate (16), third discharge gate (16) are equipped with first filter screen (18), first filter screen (18) are in before third valve (17), be equipped with agitator (4) on furnace body (11), agitator (4) include puddler (41), stirring rake (42) and agitator motor (43), connecting stirring rake (42) down in puddler (41), go up and connect agitator motor (43), puddler (41) and stirring rake (42) are all established inside furnace body (11), agitator motor (43) are established in furnace body (11) outside, be equipped with temperature detect switch (3) on furnace body (11), temperature detect switch (3) include temperature sensor (31), temperature controller (32), inside temperature sensor (31) inserted furnace body (11), the temperature controller (32) is connected with the three-phase reversing valve (5).

4. The melting apparatus for producing fused silica according to claim 3, wherein: and a second filter screen (28) is arranged between the second discharge hole (25) and the smelting chamber (24).

5. The melting apparatus for producing fused silica according to claim 4, wherein: the magnetic grating (12) is spiral and is arranged outside the first pipeline (271), and the magnetic grating (12) is not in contact with the furnace body (11).

6. The melting apparatus for producing fused silica according to claim 5, wherein: the space between the furnace shell (21) and the heat-insulating layer (22) is hollow.

7. The melting apparatus for producing fused silica according to claim 5, wherein: the material of the first discharge hole (14) is a heat-insulating material, the material of the furnace body (11) is a corrosion-resistant material, the material of the heat-insulating layer (22) is a heat-insulating material, and the material of the smelting chamber (24) is a high-temperature refractory material.

8. The melting apparatus for producing fused silica according to claim 7, wherein: the heat insulation material comprises the following components in parts by weight: 30-40 parts of calcium silicate, 15-20 parts of sodium silicate, 40-45 parts of aerogel, 10-15 parts of vitrified micro bubbles, 10-20 parts of polybutene alcohol, 3-6 parts of nickel, 15-20 parts of carbon, 3-5 parts of white latex and 20-25 parts of magnesia.

9. The melting apparatus for producing fused silica according to claim 7, wherein: the high-temperature refractory material comprises the following components in parts by weight:

50-60 parts of nano silicon dioxide, 20-25 parts of carbon fiber and TiO₂5-10 parts of glass fiber, 30-35 parts of glass fiber, 10-15 parts of silicon nitride, 3-5 parts of vinyl polydimethylsiloxane, 1-3 parts of stannous chloride, 25-30 parts of high-alumina balls and Na₂O.2SiO₂10-15 parts.

10. A working method of a smelting device for preparing fused quartz is characterized in that: the method comprises the following steps: the first discharge port (14) and the third discharge port (16) are closed firstly, quartz sand is slowly added into the furnace body (11), because of the relationship of the magnetic grating (12), the furnace body (11) has a magnetic field, magnetic mineral substances in the quartz sand are sucked away in the falling process of the quartz sand, nonmagnetic quartz sand falls to the bottom of the furnace body (11), hydrochloric acid is added into the furnace body (11), a power supply of a stirring device is turned on to start stirring of a stirring paddle (42), a temperature control switch (3) is turned on simultaneously, when the temperature in the furnace body (11) is lower than 30 ℃, a temperature sensor (31) transmits the temperature to a temperature controller (32), the temperature controller (32) sends a switch command to a three-way reversing valve (5) to control the switch to open a first exhaust pipe (271) to close a second exhaust pipe (272), and when the temperature in the furnace body (11) exceeds 45 ℃, the temperature sensor (31) transmits the temperature to the temperature controller (32), the temperature controller (32) sends a switch command to the three reversing valves (5) to control the switches to close the first exhaust pipe (271), open the second exhaust pipe (272), control the pickling reaction temperature to be 30-45 ℃, stir for 1h, open the third discharge hole (16) to realize solid-liquid separation, close the third discharge hole (16), add water to stir for 30min, open the third discharge hole (16) again to realize solid-liquid separation; after separation is finished, a first discharge port (14) is opened, quartz sand subjected to impurity removal falls into a smelting chamber (24), a heating resistance power switch is opened, the temperature is increased to 1850 ℃ to heat the quartz sand to a molten state, the molten quartz is retained by a second filter screen (28) to be infusible, a second discharge port (25) is opened, and the quartz sand is discharged through the second discharge port (25).