Electronic-grade liquid caustic soda production system

Abstract

The utility model provides an electronic-grade liquid caustic soda production system. The electronic-grade liquid caustic soda production system comprises an electrolytic tank, a liquid caustic soda intermediate tank, a magnetic filter and an electronic-grade liquid caustic soda storage tank which are connected in sequence. The magnetic filter comprises a barrel, a cover plate, magnetic bars and a stirring unit, the cover plate is connected with the top of the barrel through bolts, one end of each magnetic bar is in threaded connection with the cover plate, the other end of each magnetic bar extends into the barrel, the multiple magnetic bars are annularly arranged around the center axis in the barrel, and a liquid inlet and a liquid outlet are symmetrically formed in the outer side of the barrel. The stirring unit is located at the bottom of the magnetic bar in the barrel and comprises a motor, a stirring shaft and blades, the motor is located on the outer side of the bottom of the barrel, one end of the stirring shaft is connected with the output end of the motor, the other end of the stirring shaft extends into the barrel and is located in the center of the barrel, and the blades are arranged on the outer side of the stirring shaft. The length of the blades is smaller than the diameter of the annularly-arranged magnetic bars. Efficient production of the electronic-grade liquid caustic soda is achieved, and the quality of the electronic-grade liquid caustic soda is improved.

Description

Technical Field

[0001] The present application relates to the technical field of chlor-alkali chemical equipment, and in particular to an electronic grade liquid alkali production system. Background Art

[0002] Electronic grade liquid caustic soda, also known as electronic grade sodium hydroxide, has the characteristics of high NaOH content per unit weight, no impurities and chloride ions in the solution, and is an important raw material commonly used in the electronics industry. The main use of electronic grade sodium hydroxide is to prepare various electronic process fluids, such as detergents, cathodic protection liquids, polishing agents, etc.; in addition, electronic grade sodium hydroxide can also be used to manufacture high-purity aluminum foil, anode copper foil, printed circuit boards, optical coatings, etc.

[0003] Electronic grade liquid caustic soda is made by filtering and refining sodium hydroxide solution. The prepared sodium hydroxide solution is usually subjected to a magnetic filter to remove magnetic impurities in the sodium hydroxide solution to obtain clean sodium hydroxide, i.e., electronic grade liquid caustic soda. In the prior art, when performing magnetic filtration, a magnetic material, such as a magnetic bar, is usually arranged in the magnetic filter, so that when the sodium hydroxide solution flows through the magnetic bar, the magnetic impurities therein are adsorbed by the magnetic bar, thereby achieving the purpose of removing the magnetic impurities in the sodium hydroxide. However, after the sodium hydroxide enters the filter, the flow rate is reduced, and the contact with the magnetic bar is not sufficient, resulting in that the magnetic impurities in the sodium hydroxide solution are difficult to contact with the magnetic bar and are not adsorbed on the magnetic bar, thereby resulting in a reduction in the removal efficiency of the magnetic impurities in the sodium hydroxide solution, affecting the quality of the electronic grade liquid caustic soda. Utility Model Content

[0004] The present application provides an electronic grade liquid caustic soda production system to solve the above-mentioned problems mentioned in the background technology.

[0005] The present application provides an electronic-grade liquid alkali production system, comprising: an electrolytic cell, a liquid alkali intermediate tank, a magnetic filter and an electronic-grade liquid alkali storage tank connected in sequence.

[0006] The magnetic filter includes a cylinder, a cover, a magnetic rod and a stirring unit. The cover is connected to the top of the cylinder by bolts, one end of the magnetic rod is threadedly connected to the cover, and the other end of the magnetic rod extends into the cylinder. There are multiple magnetic rods arranged in a ring around the central axis in the cylinder, and the outer side of the cylinder is symmetrically provided with a liquid inlet and a liquid outlet.

[0007] The stirring unit is located at the bottom of the magnetic rod in the cylinder. The stirring unit includes a motor, a stirring shaft and blades. The motor is located on the outside of the bottom of the cylinder. One end of the stirring shaft is connected to the output end of the motor. The other end of the stirring shaft extends into the interior of the cylinder and is located at the center of the cylinder. The blades are arranged on the outside of the stirring shaft, and the length of the blades is smaller than the diameter of the circular arrangement of the magnetic rods.

[0008] Optionally, the magnetic bars are arranged in a ring shape around the central axis in the cylinder in multiple circles, and the magnetic bars in adjacent inner circles are located between two magnetic bars in the outer circle.

[0009] Optionally, the length of the blade is smaller than the diameter of the innermost annular arrangement of magnetic bars.

[0010] Optionally, a magnetic ring is provided at one end of the liquid outlet close to the cylinder, and the outer side of the magnetic ring is threadedly connected to the inner side of the liquid outlet.

[0011] Optionally, a plurality of spoilers are fixedly arranged on the inner wall of the cylinder, and the sides of the spoilers away from the inner wall of the cylinder are all oriented toward the center of the cylinder.

[0012] Optionally, the axis of the liquid inlet is parallel to the axis of the liquid outlet, and the position of the liquid outlet is higher than the liquid inlet.

[0013] Optionally, the electronic grade liquid caustic soda production system further comprises a microporous filter, wherein the microporous filter is located between the liquid caustic soda intermediate tank and the magnetic filter.

[0014] The electronic-grade liquid caustic soda production system provided in this application realizes the efficient production of electronic-grade liquid caustic soda and improves the quality of electronic-grade liquid caustic soda. Compared with the prior art, it has the following beneficial effects:

[0015] (1) By arranging a magnetic bar in the cylinder, the sodium hydroxide solution in the liquid caustic soda intermediate tank is sent into the cylinder and flows through the magnetic bar, and the magnetic impurities therein are adsorbed by the magnetic bar, thereby achieving the purpose of removing the magnetic impurities in the sodium hydroxide solution. By arranging a stirring unit, the sodium hydroxide solution in the cylinder is stirred, and the contact time and contact area between the sodium hydroxide solution and the magnetic bar are increased, ensuring that the magnetic impurities in the sodium hydroxide solution can be fully adsorbed on the magnetic bar, thereby improving the removal of magnetic impurities, improving the filtering effect, and thus improving the quality of electronic-grade liquid caustic soda.

[0016] (2) By arranging a magnetic ring at one end of the liquid outlet close to the cylinder, the sodium hydroxide solution can be further impurity-removed when the sodium hydroxide solution flows through the liquid outlet, thereby improving the removal efficiency of magnetic impurities. At the same time, the outer side of the magnetic ring is threadedly connected to the inner side of the liquid outlet, which facilitates the disassembly of the magnetic ring and makes the magnetic filter more convenient to use.

[0017] (3) A plurality of spoilers are fixedly arranged on the inner wall of the cylinder, which can further increase the turbulence of the sodium hydroxide solution in the cylinder, and at the same time cooperate with the stirring unit to remove the magnetic impurities in the sodium hydroxide solution to the greatest extent, thereby improving the quality of the electronic-grade liquid caustic soda. The side of the spoiler away from the inner wall of the cylinder is oriented toward the center of the cylinder. This arrangement enables the surface of the spoiler to face the flow direction of the sodium hydroxide solution, thereby increasing the collision efficiency and frequency between the sodium hydroxide solution and the spoiler, thereby increasing the agitation of the sodium hydroxide solution, and facilitating the magnetic rod to adsorb the magnetic impurities in the sodium hydroxide solution, thereby further improving the quality of the electronic-grade liquid caustic soda. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of the structure of an electronic grade liquid caustic soda production system provided in one embodiment of the present application;

[0020] Figure 2 A schematic diagram of the structure of a magnetic filter provided in one embodiment of the present application;

[0021] Figure 3 A schematic diagram of the structure of a magnetic filter provided in another embodiment of the present application;

[0022] Figure 4 A schematic diagram of the structure of an electronic grade liquid caustic soda production system provided in another embodiment of the present application;

[0023] Description of reference numerals:

[0024] 1: electrolytic cell, 2: liquid alkali intermediate tank, 3: magnetic filter, 5: electronic grade liquid alkali storage tank, 6: microporous filter, 310: cylinder, 311: bolt, 312: liquid inlet, 313: liquid outlet, 320: cover plate, 330: magnetic rod, 340: magnetic ring, 350: spoiler, 410: motor, 420: stirring shaft, 430: blade. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, the present application provides an electronic-grade liquid alkali production system, comprising: an electrolytic cell 1, a liquid alkali intermediate tank 2, a magnetic filter 3 and an electronic-grade liquid alkali storage tank 5 connected in sequence.

[0027] The magnetic filter 3 includes a cylinder 310, a cover plate 320, a magnetic rod 330 and a stirring unit. The cover plate 320 is connected to the top of the cylinder 310 by a bolt 311. One end of the magnetic rod 330 is threadedly connected to the cover plate 320, and the other end of the magnetic rod 330 extends into the cylinder 310. There are multiple magnetic rods 330 arranged in a ring around the central axis of the cylinder 310, and a liquid inlet 312 and a liquid outlet 313 are symmetrically arranged on the outer side of the cylinder 310.

[0028] The stirring unit is located at the bottom of the magnetic rod 330 in the cylinder 310. The stirring unit includes a motor 410, a stirring shaft 420 and a blade 430. The motor 410 is located on the outside of the bottom of the cylinder 310. One end of the stirring shaft 420 is connected to the output end of the motor 410. The other end of the stirring shaft 420 extends into the interior of the cylinder 310 and is located at the center of the cylinder 310. The blade 430 is arranged on the outside of the stirring shaft 420. The length of the blade 430 is smaller than the diameter of the circular arrangement of the magnetic rod 330.

[0029] Specifically, when producing electronic grade liquid caustic soda, firstly, the refined brine is transported to the electrolytic cell 1 to electrolyze the brine to obtain hydrogen (H 2 ), chlorine (Cl 2 ) and sodium hydroxide solution. The obtained sodium hydroxide solution is transported to the liquid caustic soda intermediate tank 2 for temporary storage, and the sodium hydroxide solution in the liquid caustic soda intermediate tank 2 is pumped to the magnetic filter 3 for filtration by an alkali liquid pump, and the magnetic impurities in the sodium hydroxide are adsorbed by the magnetic material in the magnetic filter 3, and then the sodium hydroxide is separated from the magnetic impurities, so as to achieve the purpose of purifying the sodium hydroxide solution, and finally the electronic grade liquid caustic soda obtained after purification is transported to the electronic grade liquid caustic soda storage tank 5 for storage and standby use.

[0030] When the magnetic filter 3 is working, the sodium hydroxide solution in the liquid alkali intermediate tank 2 is pumped into the cylinder 310 through the liquid inlet 312 by the alkali liquid pump, and flows through the magnetic rod 330, and the magnetic impurities therein are adsorbed by the magnetic rod 330, and then the purified sodium hydroxide solution flows out through the liquid outlet 313, so as to achieve the purpose of removing the magnetic impurities in the sodium hydroxide solution. The diameter inside the cylinder 310 is larger than the diameter of the liquid inlet 312, so the flow rate of the sodium hydroxide solution is reduced after entering the cylinder 310, so that the contact time between the sodium hydroxide solution and the magnetic rod 330 can be increased, which is conducive to the magnetic rod 330 to absorb the magnetic impurities in the sodium hydroxide solution.

[0031] During the filtration process, the stirring unit is turned on to stir the sodium hydroxide solution in the cylinder 310, thereby increasing the turbulence of the sodium hydroxide solution, thereby promoting full contact between the sodium hydroxide solution and the magnetic rod 330, further improving the adsorption of magnetic impurities in the sodium hydroxide solution by the magnetic rod 330, and improving the quality of the electronic-grade liquid caustic soda. The motor 410 is turned on to drive the stirring shaft 420 to rotate, and the stirring shaft 420 drives the blades 430 to rotate. The rotation of the blades 430 stirs the sodium hydroxide solution, making the turbulence of the sodium hydroxide solution more intense, increasing the contact time and contact area between the sodium hydroxide solution and the magnetic rod 330, ensuring that the magnetic impurities in the sodium hydroxide solution can be fully adsorbed on the magnetic rod 330, thereby improving the removal of magnetic impurities, improving the filtration effect, and thus improving the quality of the electronic-grade liquid caustic soda. Among them, the motor 410 is located on the outside of the bottom of the cylinder 310, one end of the stirring shaft 420 is connected to the output end of the motor 410, and the other end of the stirring shaft 420 extends into the interior of the cylinder 310. The position where the stirring shaft 420 is connected to the cylinder 310 is axially sealed to avoid leakage of the sodium hydroxide solution and protect the motor 410 from corrosion.

[0032] The cover plate 320 is connected to the top of the cylinder 310 by bolts 311, so that the cover plate 320 can be easily disassembled and assembled by screwing the bolts 311. One end of the magnetic bar 330 is threadedly connected to the cover plate 320, and the other end of the magnetic bar 330 extends into the cylinder 310. When the magnetic bar 330 needs to be replaced, the bolts 311 are first unscrewed, the cover plate 320 and the magnetic bar 330 are removed, and then the magnetic bar 330 is loosened by screwing the magnetic bar 330 to remove the magnetic bar 330 from the cover plate 320, and then a new magnetic bar 330 is installed on the cover plate 320 by threads, so that the use of the magnetic filter 3 is more convenient.

[0033] There are multiple magnetic rods 330 arranged in a ring around the central axis in the cylinder 310, and the stirring shaft 420 and the blades 430 are set at the center of the cylinder 310. The length of the blades 430 is smaller than the diameter of the circular arrangement of the magnetic rods 330, which avoids the collision between the magnetic rods 330 and the blades 430 when the blades 430 rotate with the stirring shaft 420, so that the magnetic filter 3 can operate stably for a long time.

[0034] The present application realizes the efficient production of electronic-grade liquid caustic soda through the above scheme, and improves the quality of electronic-grade liquid caustic soda. By arranging a magnetic bar in the cylinder, the sodium hydroxide solution in the liquid caustic soda intermediate tank is sent to the cylinder and flows through the magnetic bar, and the magnetic impurities therein are adsorbed by the magnetic bar, thereby achieving the purpose of removing the magnetic impurities in the sodium hydroxide solution. By arranging a stirring unit, the sodium hydroxide solution in the cylinder is stirred, the contact time and contact area between the sodium hydroxide solution and the magnetic bar are increased, and it is ensured that the magnetic impurities in the sodium hydroxide solution can be fully adsorbed on the magnetic bar, thereby improving the removal of magnetic impurities, improving the filtering effect, and then improving the quality of electronic-grade liquid caustic soda.

[0035] like Figure 3 As shown, optionally, the magnetic bars 330 are arranged in a ring around the central axis in the cylinder 310 in multiple circles, and the magnetic bars 330 of the adjacent inner circles are located between the two magnetic bars 330 of the outer circle.

[0036] Specifically, the magnetic bars 330 of the adjacent inner circles are located between the radial directions of the two magnetic bars 330 of the outer circles, so that the magnetic field distribution of the magnetic bars 330 is uniform, avoiding the local magnetic field being weak and insufficient suction force on magnetic impurities. This arrangement improves the adsorption effect of the magnetic bars 330 on magnetic impurities and promotes the purification of the sodium hydroxide solution.

[0037] Optionally, the length of the blade 430 is smaller than the diameter of the innermost magnetic bar 330 arranged in an annular shape.

[0038] Specifically, this prevents the magnetic rod 330 from colliding with the blade 430 when the blade 430 rotates with the stirring shaft 420, so that the magnetic filter 3 can operate stably for a long time.

[0039] like Figure 2 As shown, optionally, a magnetic ring 340 is provided at one end of the liquid outlet 313 close to the cylinder 310 , and the outer side of the magnetic ring 340 is threadedly connected to the inner side of the liquid outlet 313 .

[0040] Specifically, a magnetic ring 340 is provided at one end of the liquid outlet 313 close to the cylinder 310, which can further remove impurities from the sodium hydroxide solution when the sodium hydroxide solution flows through the liquid outlet 313, thereby improving the removal efficiency of magnetic impurities. At the same time, the outer side of the magnetic ring 340 is threadedly connected to the inner side of the liquid outlet 313, which facilitates the disassembly of the magnetic ring 340, making the magnetic filter 3 more convenient to use.

[0041] Optionally, a plurality of spoilers 350 are fixedly disposed on the inner wall of the cylinder 310 , and the sides of the spoilers 350 away from the inner wall of the cylinder 310 are all oriented toward the center of the cylinder 310 .

[0042] Specifically, the setting of the spoiler 350 can further increase the turbulence of the sodium hydroxide solution in the cylinder 310, and at the same time cooperate with the stirring unit to remove the magnetic impurities in the sodium hydroxide solution to the greatest extent, thereby improving the quality of the electronic-grade liquid caustic soda. The side of the spoiler 350 away from the inner wall of the cylinder 310 is all toward the center of the cylinder 310. This setting enables the plate surface of the spoiler 350 to face the flow direction of the sodium hydroxide solution, improve the collision efficiency and frequency of the sodium hydroxide solution and the spoiler 350, thereby increasing the agitation of the sodium hydroxide solution, helping the magnetic bar 330 to adsorb the magnetic impurities in the sodium hydroxide solution, and further improving the quality of the electronic-grade liquid caustic soda.

[0043] Optionally, the axis of the liquid inlet 312 is parallel to the axis of the liquid outlet 313 , and the position of the liquid outlet 313 is higher than that of the liquid inlet 312 .

[0044] Specifically, the liquid inlet 312 is lower than the liquid outlet 313, so that after the sodium hydroxide solution enters the cylinder 310 from the liquid inlet 312, the liquid level of the sodium hydroxide solution gradually rises from bottom to top, thereby increasing the contact time between the sodium hydroxide solution and the magnetic rod 330, thereby improving the filtering efficiency of magnetic impurities.

[0045] Optionally, the electronic grade liquid caustic soda production system further includes a microporous filter 6 , which is located between the liquid caustic soda intermediate tank 2 and the magnetic filter 3 .

[0046] Specifically, by arranging the microporous filter 6 before the magnetic filter 3, solid impurities and particles in the sodium hydroxide solution are removed, thereby improving the quality of the electronic grade liquid caustic soda.

[0047] The technical solution of the present application is described in detail below with reference to specific embodiments.

[0048] The operation flow of the electronic grade liquid caustic soda production system in this embodiment is as follows:

[0049] When producing electronic grade liquid caustic soda, firstly, the refined brine is transported to the electrolytic cell 1 to electrolyze the brine to obtain hydrogen (H 2 ), chlorine (Cl 2 ) and sodium hydroxide solution. The obtained sodium hydroxide solution is transferred to the liquid caustic soda intermediate tank 2 for temporary storage, and then the sodium hydroxide solution is filtered through the microporous filter 6 to remove solid impurities and particles in the sodium hydroxide solution, and the sodium hydroxide solution filtered through the microporous filter 6 is pumped into the cylinder 310 through the liquid inlet 312 by the alkali liquid pump, and the liquid inlet 312 is lower than the liquid outlet 313, so that after the sodium hydroxide solution enters the cylinder 310 through the liquid inlet 312, the liquid level of the sodium hydroxide solution in the cylinder 310 gradually rises from bottom to top, and flows through the magnetic rod 330, and the magnetic impurities therein are adsorbed by the magnetic rod 330, and then the purified sodium hydroxide solution flows out through the liquid outlet 313, and the magnetic impurities are further adsorbed by the magnetic ring 340 at one end of the liquid outlet 313 close to the cylinder 310 to obtain the electronic grade liquid caustic soda, and transferred to the electronic grade liquid caustic soda storage tank 5 for storage and standby.

[0050] During the filtering process, the motor 410 is turned on to drive the stirring shaft 420 to rotate, and the stirring shaft 420 drives the blades 430 to rotate. The rotation of the blades 430 stirs the sodium hydroxide solution. At the same time, the stirring unit and the multiple spoilers 350 fixed on the inner wall of the cylinder 310 work together to make the turbulence of the sodium hydroxide solution more intense, thereby improving the removal of magnetic impurities.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electronic grade liquid caustic soda production system, characterized in that: include: An electrolytic cell (1), a liquid alkali intermediate tank (2), a magnetic filter (3) and an electronic grade liquid alkali storage tank (5) connected in sequence; The magnetic filter (3) comprises a cylinder (310), a cover plate (320), a magnetic rod (330) and a stirring unit, wherein the cover plate (320) is connected to the top of the cylinder (310) via a bolt (311), one end of the magnetic rod (330) is threadedly connected to the cover plate (320), the other end of the magnetic rod (330) extends into the cylinder (310), and a plurality of magnetic rods (330) are arranged in a ring around the central axis of the cylinder (310), and a liquid inlet (312) and a liquid outlet (313) are symmetrically arranged on the outer side of the cylinder (310); The stirring unit is located at the bottom of the magnetic rod (330) in the cylinder (310), and comprises a motor (410), a stirring shaft (420) and a blade (430). The motor (410) is located outside the bottom of the cylinder (310), one end of the stirring shaft (420) is connected to the output end of the motor (410), and the other end of the stirring shaft (420) extends into the interior of the cylinder (310) and is located at the center of the cylinder (310). The blade (430) is arranged outside the stirring shaft (420), and the length of the blade (430) is smaller than the diameter of the circular arrangement of the magnetic rods (330).

2. The electronic grade liquid caustic soda production system according to claim 1, characterized in that: The magnetic bars (330) are arranged in a ring shape in a plurality of circles around the central axis in the cylinder (310), and the magnetic bars (330) of adjacent inner circles are located between two magnetic bars (330) of the outer circle.

3. The electronic grade liquid caustic soda production system according to claim 2, characterized in that: The length of the blade (430) is smaller than the diameter of the innermost annular arrangement of the magnetic bars (330).

4. The electronic grade liquid caustic soda production system according to claim 1, characterized in that: A magnetic ring (340) is provided at one end of the liquid outlet (313) close to the cylinder (310), and the outer side of the magnetic ring (340) is threadedly connected to the inner side of the liquid outlet (313).

5. The electronic grade liquid caustic soda production system according to claim 1, characterized in that: A plurality of spoilers (350) are fixedly arranged on the inner wall of the cylinder (310), and the sides of the spoilers (350) away from the inner wall of the cylinder (310) are all oriented toward the center of the cylinder (310).

6. The electronic grade liquid caustic soda production system according to claim 1, characterized in that: The axis of the liquid inlet (312) is parallel to the axis of the liquid outlet (313), and the position of the liquid outlet (313) is higher than that of the liquid inlet (312).

7. The electronic grade liquid caustic soda production system according to any one of claims 1 to 6, characterized in that: The electronic-grade liquid caustic soda production system further comprises a microporous filter (6), wherein the microporous filter (6) is located between the liquid caustic soda intermediate tank (2) and the magnetic filter (3).

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