阅读说明：本技术 一种电子级硫酸生产系统及生产工艺 (Electronic-grade sulfuric acid production system and production process ) 是由 林益兴 于 2021-08-10 设计创作，主要内容包括：本发明公开了一种电子级硫酸生产系统,包括超声雾化器；蒸发罐；冷凝罐；储液箱；散热器；所述蒸发罐内从上到下分别安装有固定架和锥面加热器,所述固定架上转动插设有轴杆,所述轴杆的上端延伸至固定架的上方并安装有气流扇叶；本发明还公开了一种电子级硫酸生产工艺,包括以下步骤：环境冲洗；超声雾化；高温蒸发；高压冷凝；蓄积存储。本发明通过返流管实现蒸发冷凝的循环,使得系统能够反复提纯,通过超声雾化器雾化液体浓硫酸增加其蒸发的速度,通过除垢器将蒸发残留的硫酸盐粉末刮除,即除去了硫酸中含有的硫酸盐杂质,也能够保持弧面加热器的热效率,且通过螺旋冷凝管和螺旋预热管降低系统的能耗。(The invention discloses an electronic-grade sulfuric acid production system, which comprises an ultrasonic atomizer; an evaporator tank; a condensing tank; a liquid storage tank; a heat sink; a fixing frame and a conical surface heater are respectively installed in the evaporation tank from top to bottom, a shaft lever is inserted on the fixing frame in a rotating mode, and the upper end of the shaft lever extends to the upper portion of the fixing frame and is provided with airflow fan blades; the invention also discloses an electronic-grade sulfuric acid production process, which comprises the following steps: environmental flushing; ultrasonic atomization; high-temperature evaporation; condensing under high pressure; and accumulating and storing. The invention realizes the circulation of evaporation and condensation through the reflux pipe, so that the system can be repeatedly purified, the liquid concentrated sulfuric acid is atomized by the ultrasonic atomizer to increase the evaporation speed, the sulfate powder remained after evaporation is scraped by the scaler, namely, sulfate impurities contained in sulfuric acid are removed, the heat efficiency of the cambered surface heater can also be kept, and the energy consumption of the system is reduced through the spiral condensing pipe and the spiral preheating pipe.)

1. An electronic grade sulfuric acid production system, comprising:

the ultrasonic atomizer (1) is used for atomizing standard industrial-grade concentrated sulfuric acid into fine particles through ultrasonic vibration;

the evaporation tank (2) is used for heating and evaporating the concentrated sulfuric acid atomized into fine particles to form sulfuric acid vapor;

a condensing tank (3) for condensing the sulfuric acid vapor into a sulfuric acid liquid;

a liquid storage tank (4) for storing the condensed sulfuric acid liquid;

the radiator (5) is used for reducing the heat of the steam sulfuric acid in the condensing tank (3) and preheating the concentrated sulfuric acid entering the ultrasonic atomizer (1);

the evaporator is characterized in that a fixing frame (23) and a conical surface heater (6) are respectively installed in the evaporating pot (2) from top to bottom, a shaft rod (7) is inserted into the fixing frame (23) in a rotating mode, the upper end of the shaft rod (7) extends to the top of the fixing frame (23), airflow fan blades (71) are installed at the upper end of the shaft rod located above the fixing frame, the lower end of the shaft rod (7) extends into the conical surface heater (6), and a scale remover (8) is installed at the lower end of the shaft rod.

2. The electronic-grade sulfuric acid production system according to claim 1, wherein the ultrasonic atomizer (1) is provided with a liquid inlet pipe (11) and an atomizing pipe (12), the liquid inlet pipe (11) is provided with a quantitative switch valve (111), and an end opening of the atomizing pipe (12) far away from the ultrasonic atomizer (1) extends into the evaporation tank (2), and the end opening of the atomizing pipe faces upwards in the center.

3. An electronic grade sulfuric acid production system according to claim 2, characterized in that the heat radiator (5) is respectively provided with a spiral condensation pipe (51) and a spiral preheating pipe (52), the spiral condensation pipe (51) and the spiral preheating pipe (52) are connected in series, the spiral condensation pipe (51) is arranged in the condensation tank (3), and the spiral preheating pipe (52) is arranged around the outer wall of the liquid inlet pipe (11).

4. The electronic-grade sulfuric acid production system according to claim 3, wherein a vapor pipe (22) is installed at the upper end of the evaporation tank (2), one end of the vapor pipe (22) far away from the evaporation tank (2) extends into the condensation tank (3), a booster pump (221) is installed on the vapor pipe (22), a impurity discharging pipe (21) is installed at the lower end of the evaporation tank (2), and an impurity discharging switch valve (211) is installed on the impurity discharging pipe (21).

5. The electronic-grade sulfuric acid production system according to claim 3, wherein a return pipe (31) is installed at the upper end of the condensing tank (3), one end of the return pipe (31) far away from the condensing tank (3) extends into the ultrasonic atomizer (1), a check valve (311) is installed on the return pipe (31), a flushing pipe (9) is installed on the side wall of one end of the return pipe (31) close to the ultrasonic atomizer (1), a flushing switch valve (91) is installed on the flushing pipe (9), a liquid discharge pipe (32) is installed at the lower end of the condensing tank (3), a liquid pump (321) is installed on the liquid discharge pipe (32), one end of the liquid discharge pipe (32) far away from the condensing tank (3) extends into the liquid storage tank (4), a pressure release valve (41) is installed on the upper surface of the liquid storage tank (4), and a liquid discharge pipe (42) is installed below the side wall of the liquid storage tank (4), and a liquid discharging switch valve (421) is arranged on the liquid discharging pipe (42).

6. The electronic-grade sulfuric acid production system according to claim 3, wherein the conical heater (6) comprises a conical heating surface (61), the scale remover (8) comprises a rotating baffle (81) fixedly mounted at the lower end of the shaft rod (7), an airflow baffle (82) is mounted at the lower end of the rotating baffle (81), two impurity guide grooves (83) are symmetrically formed in the side wall of the rotating baffle (81), the upper end of each impurity guide groove (83) is closed, a scraper (831) is mounted in each impurity guide groove (83), and each scraper (831) is in contact with the conical heating surface (61).

7. An electronic grade sulfuric acid production process, characterized in that the electronic grade sulfuric acid production system of any one of claims 1 to 6 is applied, comprising the steps of:

A. environmental flushing; opening a flushing switch valve (91), a booster pump (221), a liquid pump (321) and a liquid discharging switch valve (421), leading protective gas into the ultrasonic atomizer (1), an evaporating tank (2), a condensing tank (3) and a liquid storage tank (4) and flowing in sequence, eliminating original impurities and miscellaneous gases in the ultrasonic atomizer, and then closing the flushing switch valve (91), the liquid pump (321) and the liquid discharging switch valve (421);

B. ultrasonic atomization; opening a quantitative switch valve (111), injecting a certain amount of standard industrial concentrated sulfuric acid into an ultrasonic atomizer (1) through a liquid inlet pipe (11), atomizing concentrated sulfuric acid liquid into fine particles through ultrasonic oscillation by the ultrasonic atomizer (1), and spraying sulfuric acid mist into an evaporation tank (2) from an atomizing pipe (12) under the drive of directional air flow formed by a booster pump (221);

C. high-temperature evaporation; atomized sulfuric acid flows from the lower part of the inside of the evaporation tank (2) in the upward direction under the action of air flow, so that sulfuric acid mist can be attached to a conical heating surface (61) of a conical heater (6), the conical heater (6) heats attached fine sulfuric acid particles to reach a boiling point and gasifies the fine sulfuric acid particles, and the gasified sulfuric acid enters a condensation tank (3) through a steam pipe (22) and a booster pump (221);

D. condensing under high pressure; the condensing tank (3) enables the internal pressure to be higher than the standard atmospheric pressure under the action of a booster pump (221), so that the boiling point of the sulfuric acid is increased, namely the gasified sulfuric acid is rapidly liquefied, and is cooled by a spiral condensing pipe (51) to form low-temperature sulfuric acid which is deposited at the bottom of the condensing tank (3);

E. accumulating and storing; when the low-temperature sulfuric acid at the bottom of the condensing tank (3) is continuously accumulated to a set liquid level, the liquid pump (321) is started, the low-temperature sulfuric acid is pumped into the liquid storage tank (4) through the liquid discharge pipe (32) to be stored, and the pressure of the liquid storage tank (4) is balanced through the pressure relief valve (41) on the liquid storage tank (4).

8. The process according to claim 7, wherein, in step C, after the sulfuric acid mist is heated and gasified on the conical heating surface (61) of the conical surface heater (6), sulfate containing metal ions in the sulfuric acid loses sulfuric acid solvent to be solidified to form sulfate powder to be attached to the surface of the conical heating surface (61), directional air flow from bottom to top in the evaporation tank (2) enables the airflow fan blade (71) to drive the shaft lever (7) to rotate, the cleaner (8) is rotated, the scraper (831) in the impurity guide groove (83) is scraped on the conical heating surface (61) by the rotation of the cleaner (8) to scrape the attached impurities, and the scraped sulfate impurities fall into the bottom of the evaporating pot (2) along the impurity guide groove (83), and the sulfate impurities are discharged from the impurity discharge pipe (21) by opening the impurity discharge switch valve (211) after use.

9. An electronic grade sulfuric acid production process according to claim 7, characterized in that in step D, high temperature gas sulfuric acid exchanges heat with the spiral condensation pipe (51) in the condensation tank (3), so that the refrigerant in the spiral condensation pipe (51) is heated, and the heated refrigerant flows into the spiral preheating pipe (52) under the circulation of the radiator (5), and concentrated sulfuric acid entering the ultrasonic atomizer (1) from the liquid inlet pipe (11) is preheated by contact heat exchange.

10. The electronic-grade sulfuric acid production process according to claim 7, wherein in the step D, a large amount of high-temperature gas sulfuric acid enters the condensation tank (3), the spiral condensation pipe (51) cannot fully condense the high-temperature gas sulfuric acid in time, the high-temperature gas sulfuric acid which is not condensed enters the ultrasonic atomizer (1) through the return pipe (31) to be recycled, and the return pipe (31) forms a gas flow circulation through the ultrasonic atomizer (1), the atomization pipe (12), the evaporation tank (2), the vapor pipe (22) and the condensation tank (3).

Technical Field

The invention relates to the technical field of industrial electronic chemicals, in particular to an electronic-grade sulfuric acid production system and a production process.

Background

The electronic-grade sulfuric acid is a common corrosion cleaning raw material in the production process of the circuit board, is usually obtained by repeatedly distilling and removing impurities through standard industrial concentrated sulfuric acid (the concentration is 98%), and because the standard industrial concentrated sulfuric acid contains more metal sulfate, the quality of the circuit board is influenced by direct use of the standard industrial concentrated sulfuric acid, so the impurities need to be removed.

The existing production process of electronic grade sulfuric acid is generally a multiple distillation method, and the used production system is also specific to the production process, namely, the electronic grade sulfuric acid is obtained by repeatedly distilling and filtering industrial concentrated sulfuric acid for multiple times. However, when the metal sulfate is distilled and filtered, the metal sulfate is easy to block the filter or deposit in evaporation equipment for a long time, the production efficiency is reduced due to easy blocking, and the metal sulfate impurities can be removed only by detaching for cleaning or replacing, which is not convenient enough.

Disclosure of Invention

The invention aims to solve the problems that in the prior art, impurities purified and filtered easily block a certain link of a system, so that the production efficiency is low, and the system is not convenient and fast to disassemble and clean, and provides an electronic-grade sulfuric acid production system and a production process.

In order to achieve the purpose, the invention adopts the following technical scheme:

an electronic-grade sulfuric acid production system and a production process comprise:

the ultrasonic atomizer is used for atomizing standard industrial-grade concentrated sulfuric acid into fine particles through ultrasonic vibration;

the evaporating pot is used for heating and evaporating the concentrated sulfuric acid atomized into fine particles to form sulfuric acid vapor;

a condensing tank for condensing the sulfuric acid vapor into a sulfuric acid liquid;

the liquid storage tank is used for storing the condensed sulfuric acid liquid;

the radiator is used for reducing the heat of the steam sulfuric acid in the condensing tank and preheating the concentrated sulfuric acid entering the ultrasonic atomizer;

the evaporator comprises an evaporation tank, and is characterized in that a fixing frame and a conical surface heater are respectively installed in the evaporation tank from top to bottom, a shaft lever is inserted on the fixing frame in a rotating mode, the upper end of the shaft lever extends to the top of the fixing frame, airflow fan blades are installed at the upper end of the shaft lever located above the fixing frame, the lower end of the shaft lever extends into the conical surface heater, and a scale remover is installed at the lower end of the shaft lever.

Preferably, install feed liquor pipe and atomizing pipe on the ultrasonic nebulizer respectively, install the ration ooff valve on the feed liquor pipe, the one end mouth of pipe that ultrasonic nebulizer was kept away from to the atomizing pipe extends to in the evaporating pot, and this end mouth of pipe of this atomizing pipe is upwards placed in the middle.

Preferably, the heat radiator is provided with a spiral condensation pipe and a spiral preheating pipe respectively, the spiral condensation pipe and the spiral preheating pipe are connected in series, the spiral condensation pipe is arranged in the condensation tank, and the spiral preheating pipe surrounds the outer wall of the liquid inlet pipe.

Preferably, the upper end of evaporating pot is installed the steam pipe, the one end that the evaporating pot was kept away from to the steam pipe extends to in the condensate tank, install the booster pump on the steam pipe, arrange miscellaneous pipe is installed to the lower extreme of evaporating pot, arrange and install on the miscellaneous pipe and arrange miscellaneous ooff valve.

Preferably, return the flow tube is installed to the upper end of condensing tank, return the flow tube and keep away from in the one end of condensing tank extends to the ultrasonic nebulizer, return and install the check valve on the flow tube, return the flow tube and be close to and install the flushing pipe on the one end lateral wall of ultrasonic nebulizer, install the flush switch valve on the flushing pipe, the fluid-discharge tube is installed to the lower extreme of condensing tank, install the liquid pump on the fluid-discharge tube, the one end that the condensing tank was kept away from to the fluid-discharge tube extends to in the liquid reserve tank, the last surface mounting of liquid reserve tank has the relief valve, the casting pipe is installed to the lateral wall below of liquid reserve tank, install the casting switch valve on the casting pipe.

Preferably, the conical surface heater includes the toper heating surface, the descaler includes the rotating baffle of fixed mounting in axostylus axostyle lower extreme, the air current separation blade is installed to the lower extreme of rotating baffle, two are seted up on the lateral wall of rotating baffle and are led miscellaneous groove, every the upper end that leads miscellaneous groove all seals, every lead miscellaneous inslot and all install the scraper blade, every the scraper blade all contacts with the toper heating surface.

An electronic-grade sulfuric acid production process applying the electronic-grade sulfuric acid production system comprises the following steps:

A. environmental flushing; opening a flushing switch valve, a booster pump, a liquid pump and a liquid discharging switch valve to enable protective gas to be introduced and flow along the ultrasonic atomizer, the evaporating tank, the condensing tank and the liquid storage tank in sequence, eliminating original impurities and miscellaneous gases in the ultrasonic atomizer, and then closing the flushing switch valve, the liquid pump and the liquid discharging switch valve;

B. ultrasonic atomization; opening a quantitative switch valve, injecting a certain amount of standard industrial concentrated sulfuric acid into an ultrasonic atomizer through a liquid inlet pipe, atomizing concentrated sulfuric acid liquid into fine particles through ultrasonic oscillation by the ultrasonic atomizer, and spraying sulfuric acid mist into an evaporation tank from an atomizing pipe under the drive of directional air flow formed by a booster pump;

C. high-temperature evaporation; atomized sulfuric acid flows upwards from the lower part of the inside of the evaporating pot under the action of air flow, sulfuric acid mist is attached to a conical heating surface of a conical heater, the conical heater heats attached fine sulfuric acid particles to reach a boiling point and gasifies the fine sulfuric acid particles, and the gasified sulfuric acid enters a condensing pot through a steam pipe and a booster pump;

D. condensing under high pressure; the condensing tank enables the internal pressure of the condensing tank to be greater than the standard atmospheric pressure under the action of a booster pump, so that the boiling point of the sulfuric acid is increased, namely the gasified sulfuric acid is rapidly liquefied, and is cooled by a spiral condensing pipe to form low-temperature sulfuric acid which is deposited at the bottom of the condensing tank;

E. accumulating and storing; the low temperature sulphuric acid of condensate tank bottom constantly accumulates to when setting for the liquid level, and the liquid pump starts, and the liquid reserve tank internal storage is gone into to the low temperature sulphuric acid through the fluid-discharge tube pump, and the relief valve pressure release on the liquid reserve tank makes the liquid reserve tank internal pressure balanced.

Preferably, in step C, after the sulfuric acid mist is heated and gasified on the conical heating surface of the conical surface heater, the sulfate containing metal ions in the sulfuric acid loses the sulfuric acid solvent to be solidified to form sulfate powder attached to the surface of the conical heating surface, the airflow fan blade drives the shaft rod to rotate by the directional airflow from bottom to top in the evaporating pot, the cleaner is rotated to enable the scraper in the impurity guide groove to scrape on the conical heating surface, attached impurities are scraped, the scraped sulfate impurities fall into the bottom of the evaporating pot along the impurity guide groove, and the sulfate impurities are discharged from the impurity discharge pipe by opening the impurity discharge switch valve after the use is finished.

Preferably, in step D, the high-temperature gas sulfuric acid exchanges heat with the spiral condensation pipe in the condensation tank, so that the refrigerant in the spiral condensation pipe is heated, and the heated refrigerant flows into the spiral preheating pipe under the circulation of the radiator, and the concentrated sulfuric acid entering the ultrasonic atomizer from the liquid inlet pipe is preheated through contact heat exchange.

Preferably, in step D, a large amount of high-temperature gas sulfuric acid enters the condensing tank, the spiral condensing tube cannot fully condense the high-temperature gas sulfuric acid in time, the high-temperature gas sulfuric acid which is not condensed enters the ultrasonic atomizer through the return tube to be recycled, and the return tube forms an airflow circulation through the ultrasonic atomizer, the atomizing tube, the evaporating tank, the steam tube and the condensing tank.

The invention has the following beneficial effects:

1. through the cooperation of radiator and spiral condenser pipe and spiral preheating pipe for the spiral condenser pipe is with high-temperature gas sulphuric acid cooling condensation to liquid in the condenser tank, the heat of the heat transfer in the spiral condenser pipe flows to the spiral preheating pipe in through the radiator, then can make spiral preheating pipe and feed liquor pipe contact the heat transfer, make the concentrated sulfuric acid raw materials waste heat that gets into from the feed liquor pipe, realize the reuse of heat energy, reduce conical surface heater's energy consumption, make entire system's energy consumption reduce.

2. Through the axostylus axostyle, the cooperation of air current flabellum and scaler, make the air current flabellum rotatory in the directional air current of bottom-up in the evaporating pot, then it is rotatory to drive the axostylus axostyle, the axostylus axostyle makes the scaler rotate, adnexed sulfate powder is scraped on the arc heating surface of pivoted scaler through the scraper blade with the cambered surface heater, the powder of scraping off leads miscellaneous groove landing to the evaporating pot bottom through the scaler and collects, can be effectual in the sulphuric acid content of reduction metal ion, lead miscellaneous groove through upper end confined and can avoid atomizing sulphuric acid and dry sulfate contact, and avoided sulfate powder to be inhaled by the air current, make the surface of arc heating surface clear up simultaneously, do not influence thermal conduction, make the row miscellaneous more reliable.

3. Through the cooperation of return flow pipe and condensing tank for high temperature gas sulphuric acid is when entering into the condensing tank condensation, and a small amount of gas sulphuric acid can not be condensed completely, then through the return flow pipe circulation of flowing back to ultrasonic nebulizer, and the return flow pipe can cooperate ultrasonic nebulizer, atomizing pipe, evaporating pot, steam pipe and condensing tank to form the air current circulation, guarantees distillative continuous circulation and distillative purification effect, makes system purification purity higher.

4. Liquid concentrated sulfuric acid is rapidly atomized into fine particles through an ultrasonic atomizer, so that the contact area of the concentrated sulfuric acid and an arc surface heater in an evaporating pot is increased, the heating speed of the concentrated sulfuric acid can be increased, the atomized concentrated sulfuric acid quickly reaches a boiling point and is gasified, the evaporation speed is increased, the effect of rapid evaporation and gasification is realized, the metal sulfate is rapidly separated from sulfuric acid and is dried, and rapid impurity removal and purification are realized.

In conclusion, the circulation of evaporation and condensation is realized through the reflux pipe, so that the system can be repeatedly purified, the liquid concentrated sulfuric acid is atomized by the ultrasonic atomizer to increase the evaporation speed, the sulfate powder remained after evaporation is scraped by the scaler, the sulfate impurities contained in the sulfuric acid are removed, the heat efficiency of the cambered surface heater can be maintained, and the energy consumption of the system is reduced through the spiral condensing pipe and the spiral preheating pipe.

Drawings

FIG. 1 is a schematic structural diagram of an electronic-grade sulfuric acid production system according to the present invention;

FIG. 2 is an enlarged view of a portion of a descaler of an electronic grade sulfuric acid production system according to the present invention;

in the figure: 1 ultrasonic atomizer, 11 liquid inlet pipe, 111 quantitative switch valve, 12 atomizing pipe, 2 evaporating pot, 21 impurity discharging pipe, 211 impurity discharging switch valve, 22 vapor pipe, 221 booster pump, 23 fixing frame, 3 condensing pot, 31 return pipe, 311 check valve, 32 liquid discharging pipe, 321 liquid pump, 4 liquid storage tank, 41 pressure relief valve, 42 liquid discharging pipe, 421 liquid discharging switch valve, 5 radiator, 51 spiral condensing pipe, 52 spiral preheating pipe, 6 conical heater, 61 conical heating surface, 7 shaft lever, 71 airflow fan blade, 8 descaler, 81 rotating baffle, 82 airflow baffle, 83 impurity guiding groove, 831 scraper, 9 flushing pipe, 91 flushing switch valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-2, an electronic grade sulfuric acid production system comprising:

the ultrasonic atomizer 1 is used for atomizing standard industrial-grade concentrated sulfuric acid into fine particles through ultrasonic vibration;

the evaporation tank 2 is used for heating and evaporating the concentrated sulfuric acid atomized into fine particles to form sulfuric acid vapor;

a condensing tank 3 for condensing the sulfuric acid vapor into a sulfuric acid liquid;

a liquid storage tank 4 for storing the condensed sulfuric acid liquid;

a radiator 5 for reducing the heat of the vapor sulfuric acid in the condensation tank 3 and preheating the concentrated sulfuric acid entering the ultrasonic atomizer 1;

the evaporating pot 2 is provided with a fixing frame 23 and a conical surface heater 6 from top to bottom, respectively, a shaft rod 7 is rotatably inserted into the fixing frame 23, the upper end of the shaft rod 7 extends above the fixing frame 23, an airflow fan 71 is mounted at the upper end of the shaft rod above the fixing frame, the lower end of the shaft rod 7 extends into the conical surface heater 6, and a scale remover 8 is mounted at the lower end of the shaft rod.

Install feed liquor pipe 11 and atomizing pipe 12 on the ultrasonic nebulizer 1 respectively, install quantitative switch valve 111 on the feed liquor pipe 11, the one end mouth of pipe that ultrasonic nebulizer 1 was kept away from to atomizing pipe 12 extends to in the evaporating pot 2, and this end mouth of pipe of this atomizing pipe is placed in the middle up.

The heat radiator 5 is respectively provided with a spiral condensing pipe 51 and a spiral preheating pipe 52, the spiral condensing pipe 51 and the spiral preheating pipe 52 are connected in series, the spiral condensing pipe 51 is arranged in the condensing tank 3, and the spiral preheating pipe 52 surrounds the outer wall of the liquid inlet pipe 11.

The upper end of the evaporation tank 2 is provided with a steam pipe 22, one end of the steam pipe 22 far away from the evaporation tank 2 extends into the condensation tank 3, the steam pipe 22 is provided with a booster pump 221, the lower end of the evaporation tank 2 is provided with a impurity discharge pipe 21, and the impurity discharge pipe 21 is provided with an impurity discharge switch valve 211.

Return tube 31 is installed to the upper end of condensate tank 3, return tube 31 keeps away from the one end of condensate tank 3 and extends to in the ultrasonic nebulizer 1, install on the return tube 31 and prevent contrary valve 311, return tube 31 is close to and installs flushing pipe 9 on the one end lateral wall of ultrasonic nebulizer 1, install flushing switch valve 91 on the flushing pipe 9, fluid-discharge tube 32 is installed to the lower extreme of condensate tank 3, install liquid pump 321 on the fluid-discharge tube 32, the one end that condensate tank 3 was kept away from to fluid-discharge tube 32 extends to in liquid reserve tank 4, the last surface mounting of liquid reserve tank 4 has relief valve 41, tapping pipe 42 is installed to the lateral wall below of liquid reserve tank 4, install tapping switch valve 421 on the tapping pipe 42.

The conical surface heater 6 comprises a conical heating surface 61, the scale remover 8 comprises a rotating baffle 81 fixedly mounted at the lower end of the shaft rod 7, an airflow blocking piece 82 is mounted at the lower end of the rotating baffle 81, two impurity guide grooves 83 are symmetrically formed in the side wall of the rotating baffle 81, the upper end of each impurity guide groove 83 is sealed, a scraper 831 is mounted in each impurity guide groove 83, and each scraper 831 is in contact with the conical heating surface 61.

An electronic-grade sulfuric acid production process comprises the following steps:

A. environmental flushing; opening the flushing switch valve 91, the booster pump 221, the liquid pump 321 and the liquid discharging switch valve 421 to enable the protective gas to be introduced and flow along the ultrasonic atomizer 1, the evaporation tank 2, the condensation tank 3 and the liquid storage tank 4 in sequence, eliminating original impurities and miscellaneous gases in the interior, and then closing the flushing switch valve 91, the liquid pump 321 and the liquid discharging switch valve 421;

B. ultrasonic atomization; opening a quantitative switch valve 111, injecting a certain amount of standard industrial concentrated sulfuric acid into an ultrasonic atomizer 1 through a liquid inlet pipe 11, atomizing concentrated sulfuric acid liquid into fine particles through ultrasonic oscillation by the ultrasonic atomizer 1, and spraying sulfuric acid mist into an evaporation tank 2 from an atomizing pipe 12 under the drive of directional air flow formed by a booster pump 221;

C. high-temperature evaporation; atomized sulfuric acid flows upwards from the lower part of the inside of the evaporation tank 2 under the action of air flow, sulfuric acid mist is attached to the conical heating surface 61 of the conical heater 6, the conical heater 6 quickly heats attached fine sulfuric acid particles to quickly reach the boiling point and gasifies the fine sulfuric acid particles, and the gasified sulfuric acid enters the condensation tank 3 through the steam pipe 22 and the booster pump 221;

D. condensing under high pressure; the condensing tank 3 makes the internal pressure thereof greater than the standard atmospheric pressure under the action of the booster pump 221, so that the boiling point of the sulfuric acid is increased, namely, the gasified sulfuric acid is rapidly liquefied, and is cooled by the spiral condensing pipe 51 to form low-temperature sulfuric acid which is deposited at the bottom of the condensing tank 3;

E. accumulating and storing; when the low-temperature sulfuric acid at the bottom of the condensing tank 3 is continuously accumulated to a certain degree, the liquid pump 321 is started, the low-temperature sulfuric acid is pumped into the liquid storage tank 4 through the liquid discharge pipe 32 and stored, and the pressure of the liquid storage tank 4 is balanced through the pressure relief valve 41 on the liquid storage tank 4.

In step C, after the sulfuric acid mist is heated and gasified on the tapered heating surface 61 of the tapered heater 6, the sulfate containing metal ions in the sulfuric acid loses the sulfuric acid solvent to be solidified to form sulfate powder attached to the surface of the tapered heating surface 61, the airflow fan blade 71 drives the shaft rod 7 to rotate by the directional airflow from bottom to top in the evaporation tank 2, so that the scaler 8 rotates, the scaler 8 rotates to scrape the scraper 831 in the impurity guide groove 83 on the tapered heating surface 61, the attached impurities are scraped, the scraped sulfate impurities fall into the bottom of the evaporation tank 2 along the impurity guide groove 83, and the sulfate impurities are discharged from the impurity discharge pipe 21 by opening the impurity discharge switch valve 211 after the use is finished.

In step D, the high-temperature gas sulfuric acid exchanges heat with the spiral condenser pipe 51 in the condensing tank 3, so that the refrigerant in the spiral condenser pipe 51 is heated, and the heated refrigerant flows into the spiral preheating pipe 52 under the circulation of the heat radiator 5, and the concentrated sulfuric acid entering the ultrasonic atomizer 1 from the liquid inlet pipe 11 is preheated through contact heat exchange.

In step D, a large amount of high-temperature gas sulfuric acid enters the condensing tank 3, the spiral condensing tube 51 cannot completely condense the high-temperature gas sulfuric acid in time, the high-temperature gas sulfuric acid which is not condensed enters the ultrasonic atomizer 1 through the return tube 31 to be recycled, and the return tube 31 forms an airflow circulation through the ultrasonic atomizer 1, the atomizing tube 12, the evaporating tank 2, the steam tube 22 and the condensing tank 3.

When the ultrasonic atomizer is used, firstly, the flushing switch valve 91, the booster pump 221, the liquid pump 321 and the liquid discharging switch valve 421 are opened, so that protective gas is introduced and flows along the ultrasonic atomizer 1, the evaporation tank 2, the condensation tank 3 and the liquid storage tank 4 in sequence, original impurities and miscellaneous gases in the ultrasonic atomizer are eliminated, and then the flushing switch valve 91, the liquid pump 321 and the liquid discharging switch valve 421 are closed.

Secondly, the quantitative switch valve 111 is opened, a certain amount of standard industrial concentrated sulfuric acid is injected into the ultrasonic atomizer 1 through the liquid inlet pipe 11, the ultrasonic atomizer 1 atomizes the concentrated sulfuric acid liquid into fine particles through ultrasonic oscillation, and the sulfuric acid mist is ejected into the evaporation tank 2 from the atomizing pipe 12 under the drive of directional air flow formed by the booster pump 221.

Then, the atomized sulfuric acid flows from the lower part of the inside of the evaporation tank 2 under the action of the air flow, the sulfuric acid mist is attached to the conical heating surface 61 of the conical heater 6, the conical heater 6 rapidly heats the attached fine sulfuric acid particles to rapidly reach the boiling point and gasifies the fine sulfuric acid particles, the gasified sulfuric acid enters the condensation tank 3 through the steam pipe 22 and the booster pump 221, after the sulfuric acid mist is heated and gasified on the conical heating surface 61 of the conical heater 6, the sulfate containing metal ions in the sulfuric acid loses the sulfuric acid solvent to be solidified to form sulfate powder which is attached to the surface of the conical heating surface 61, the directional air flow from bottom to top in the evaporation tank 2 enables the air flow fan blades 71 to drive the shaft lever 7 to rotate, the scale remover 8 is rotated, the scraper 831 in the impurity guiding groove 83 is scraped on the conical heating surface 61 by the rotation of the scale remover 8, the attached impurities are scraped, and the scraped sulfate impurities fall to the bottom of the evaporation tank 2 along the impurity guiding groove 83.

Then, the condensing tank 3 makes its internal pressure greater than the standard atmospheric pressure under the action of the booster pump 221, so as to increase the boiling point of the sulfuric acid, that is, the gasified sulfuric acid is liquefied rapidly, and is cooled by the spiral condensing pipe 51 to form low-temperature sulfuric acid and deposited at the bottom of the condensing tank 3, the high-temperature gas sulfuric acid exchanges heat with the spiral condensing pipe 51 in the condensing tank 3, so as to heat the refrigerant in the spiral condensing pipe 51, the heated refrigerant flows into the spiral preheating pipe 52 under the circulation of the heat radiator 5, the concentrated sulfuric acid entering the ultrasonic atomizer 1 from the liquid inlet pipe 11 is preheated by contact heat exchange, the high-temperature gas sulfuric acid enters the condensing tank 3 in large quantity, the spiral condensing pipe 51 cannot completely condense the high-temperature gas sulfuric acid in time, the high-temperature gas sulfuric acid which is not condensed enters the ultrasonic atomizer 1 through the return pipe 31 to circulate again, and the return pipe 31 passes through the ultrasonic atomizer 1, The atomization pipe 12, the evaporation tank 2, the vapor pipe 22 and the condensation tank 3 form a gas flow circulation, so that concentrated sulfuric acid is repeatedly rectified and purified.

Finally, when the low-temperature sulfuric acid at the bottom of the condensing tank 3 is continuously accumulated to a certain degree, the liquid pump 321 is started, the low-temperature sulfuric acid is pumped into the liquid storage tank 4 through the liquid discharge pipe 32 to be stored, the pressure relief valve 41 on the liquid storage tank 4 is used for relieving the pressure to balance the pressure in the liquid storage tank 4, after the liquid storage tank 4 is filled, the quantitative switch valve 111, the booster pump 221, the liquid pump 321 and the radiator 5 are closed, and then the impurity discharge switch valve 211 is opened to discharge the powdery sulfate.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.