CN212568573U - Online pH detection device for zinc smelting purification liquid - Google Patents

Abstract

The utility model discloses an online pH detection device for zinc smelting purifying liquid. The device comprises a filter and an analysis cup, wherein the filter is provided with a purified liquid inlet and a filtered liquid discharge pipe, and the analysis cup is provided with a filtered liquid inlet, a pH electrode and a liquid discharge port; the purified liquid inlet is communicated with the purified liquid chute through a pipeline, and the filtered liquid discharge pipe is communicated with the filtered liquid inlet through a pipeline; the liquid outlet is communicated with the purified liquid chute through a pipeline; and filtering the purifying liquid needing to detect the pH value by the filter, then entering the analyzing cup, and detecting the pH value by the pH electrode. The utility model discloses, adopt and filter the back with the scavenging solution, the measuring method of pH electrode recontacting the filtrate can filter most impurity in the scavenging solution, reduces the scale deposit and the crystallization of pH electrode, and then reduces the maintenance work of pH electrode, slows down the reduction of pH electrode precision, and then has reduced the cost of maintenance and maintenance.

Description

Online pH detection device for zinc smelting purification liquid

Technical Field

The utility model belongs to the technical field of zinc hydrometallurgy equipment, concretely relates to online pH detection device of zinc smelting purifying liquid.

Background

In the zinc smelting process of a zinc smelting purification workshop, the pH of the purification liquid in a chute needs to be measured, and the common measurement mode of the pH value of the purification liquid is that a pH electrode is held by a hand to directly contact the purification liquid, so that the pH of the purification liquid is measured.

Because the purifying liquid contains high-concentration zinc sulfate, zinc powder suspended matters and dust which are easy to form crystals, flocculent particles and other impurities formed in the purifying reaction process, under the combined action of the complex conditions, a pH electrode which is in direct contact with the purifying liquid is easy to scale and crystallize, and the pH electrode needs to be frequently maintained, and meanwhile, a sensitive component in the pH electrode is a glass bulb, so that the measurement precision is reduced and irreversible due to frequent manual washing of the electrode surface. Therefore, the service life of the pH electrode is greatly reduced, the precision of the pH electrode is reduced, and the maintenance and replacement cost of the pH electrode is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an online pH detection device of purifying liquid is smelted to zinc to effectively solve prior art's weak point.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an online pH detection device for zinc smelting purified liquid comprises a filter and an analysis cup, wherein the filter is provided with a purified liquid inlet and a filtered liquid discharge pipe, and the analysis cup is provided with a filtered liquid inlet, a pH electrode and a liquid discharge port; the purified liquid inlet is communicated with the purified liquid chute through a pipeline, and the filtered liquid discharge pipe is communicated with the filtered liquid inlet through a pipeline; the liquid outlet is communicated with the purified liquid chute through a pipeline;

and filtering the purifying liquid needing to detect the pH value by the filter, then entering the analyzing cup, and detecting the pH value by the pH electrode.

Compared with the prior art, the utility model discloses online pH detection device of scavenging solution is smelted to zinc, the form of pH electrode direct contact scavenging solution in the past, change into and filter the scavenging solution after, the measuring method of pH electrode re-contact filtrate, can filter the most high concentration in the scavenging solution very easily forms the crystallized zinc sulfate, zinc powder suspended solid, dust and purify impurity such as flocculent particles that form among the reaction process, reduce the scale deposit and the crystallization of pH electrode, and then reduce the maintenance work of pH electrode, slow down the reduction of pH electrode precision, and then reduced the cost of maintenance and maintenance. Meanwhile, the analysis cup is arranged, the pH electrode on the analysis cup is used for measuring the pH of the filtrate, and the operation is simple, convenient and quick.

Furthermore, the analysis cup comprises a cup body and an end cover arranged at the opening end of the cup body, the liquid outlet is arranged at the bottom of the cup body, the filtrate inlet is arranged on the end cover, the pH electrode is arranged on the end cover in a penetrating way, and the detection end of the pH electrode extends into the cup body.

The filtered purifying liquid, namely the filtrate enters the analysis cup through a filtrate inlet arranged on the end cover, the pH electrode is arranged on the end cover, the detection end extends into the cup body, the filtrate is detected, and after the detection is finished, the filtrate can be discharged through a liquid discharge port.

Furthermore, a first overflow port is arranged on the side wall of the cup body.

The side wall of the cup body is provided with the first overflow port, when the filtrate reaches a certain height, the filtrate can overflow from the first overflow port, so that the liquid level is prevented from further rising and overflowing from the end cover.

Furthermore, an auxiliary liquid adding port is also arranged on the end cover.

An auxiliary liquid adding port is arranged, and an acid washing liquid, clear water, a pH standard liquid and the like can be added into the analysis cup, so that the pH electrode is convenient to clean and calibrate, and the maintenance workload is reduced.

Further, the filter comprises an inlet chamber and a filtrate chamber, and the inlet chamber is communicated with the filtrate chamber through a filter element;

the purifying liquid inlet is arranged on the liquid inlet chamber, and the filtering liquid discharging pipe is arranged on the filtering liquid chamber;

the liquid inlet chamber is provided with at least one first flushing nozzle facing the filter element, and the filtrate chamber is provided with at least one second flushing nozzle facing the filter element.

Set up first washing terminals and second washing terminals, respectively towards the upper and lower both ends face of filtering piece, can clear up and wash the upper and lower both ends face of filtering piece, get rid of the residue on the filtering piece.

Further, the first washing nozzle and the second washing nozzle are both spiral nozzles; the spiral nozzle comprises a nozzle body, one side of the nozzle body is connected with a conical spiral strip, and the other side of the nozzle body is connected with a threaded connector; the shower nozzle body with be provided with the mounting thread between the toper spiral strip, the feed liquor room with be provided with on the filtrating room with the internal thread that mounting thread matches.

Set up first washing terminals and second washing terminals into spiral shower nozzle, this spiral shower nozzle's simple structure, the big difficult jam in shower nozzle aperture, and can spout solid awl water curtain, the angle can reach 55 ~ 120, has fine cleaning performance, and the residue on the filtration piece that can significantly reduce reduces the change number of times of filtering piece, improve equipment's availability factor. Meanwhile, a section of mounting thread is processed between the spray head body and the conical spiral strip in the threaded spray head, and internal threads matched with the liquid inlet chamber and the filtrate chamber are arranged on the corresponding liquid inlet chamber and the filtrate chamber, so that the spiral spray head can be conveniently detached and mounted. The spiral spray head is not required to be disassembled from the liquid inlet chamber and the filtrate chamber and then installed inside, the spiral spray head can be directly installed or removed from the outside, the spiral spray head is greatly convenient to remove and install, and the use efficiency of the equipment is further improved.

Further, the liquid inlet chamber comprises a cavity with an upward opening, and a first flange is arranged at the opening end of the cavity;

the filtrate chamber comprises a cylinder body which is penetrated up and down, a second flange is arranged at an opening at the lower end of the cylinder body, and the first flange is connected with the second flange through a bolt;

the filter member is a filter cloth and is clamped between the first flange and the second flange.

The opening end of the cavity of the liquid inlet chamber is provided with a first flange, the lower end opening of the barrel of the filtrate chamber is provided with a second flange, and the first flange and the second flange are connected through bolts, so that the liquid inlet chamber and the filtrate chamber can be conveniently detached and installed. The filter piece is arranged to be filter cloth and clamped between the first flange and the second flange, so that the filter piece is conveniently fixed and purified liquid is conveniently filtered.

Further, the filtrate chamber also comprises an upper gland, and the upper gland is connected with the upper end opening of the barrel through a bolt; the second flushing nozzle is arranged on the upper pressure cover; the filtrate discharge pipe is arranged on the upper gland in a penetrating way, and the lower port of the filtrate discharge pipe extends into the filtrate chamber.

The upper gland is arranged on the filtrate chamber and connected with the filtrate chamber through bolts, so that the filtrate chamber can be conveniently dismounted and cleaned and maintained.

Furthermore, a second overflow port is arranged on the side wall of the cylinder body, and the position of the second overflow port is higher than the position of the lower port of the filtrate discharge pipe.

The position of the second overflow port is higher than the position of the lower port of the filtrate discharge pipe, filtrate can be discharged through the filtrate discharge pipe, and meanwhile, when the liquid level of the filtrate chamber rises, the filtrate can overflow from the second overflow port, so that the liquid level is prevented from further rising and overflowing from the upper gland.

Furthermore, the device also comprises a first peristaltic pump, a second peristaltic pump and a third peristaltic pump;

the first peristaltic pump is communicated with the purified liquid chute and the purified liquid inlet and is used for pumping the purified liquid in the purified liquid chute into the filter;

the second peristaltic pump is communicated with the filtrate discharge pipe and the filtrate inlet and is used for pumping the filtrate in the filter into the analysis cup;

and the third peristaltic pump is communicated with the liquid outlet and the purified liquid chute and is used for pumping the filtered liquid in the analysis cup into the purified liquid chute.

Set up the peristaltic pump, can realize the transportation work of scavenging solution and filtrate, make the utility model discloses online pH detection device of zinc smelting scavenging solution moves more smoothly.

In order that the invention may be more clearly understood, specific embodiments thereof will be described below with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of an analyzing cup according to the present invention;

FIG. 3 is a schematic structural view of a filter according to the present invention;

fig. 4 is a schematic structural diagram of the middle spiral nozzle of the present invention.

Wherein the reference numerals are:

10. a filter; 11. a purified liquid inlet; 12. a filtrate discharge pipe; 20. an analyzing cup; 21. a filtrate inlet; 22. a pH electrode; 23. a liquid discharge port; 24. a cup body; 25. an end cap; 26. a first overflow port; 27. an auxiliary liquid addition port; 30. a purified liquid chute; 40. a liquid inlet chamber; 41. a first washing nozzle; 42. a first flange; 50. a filtrate chamber; 51. a second flange; 52. a second overflow port; 53. a gland is arranged; 54. a pickling solution adding port; 55. a second washing nozzle; 60. a filter member; 70. a gasket; 81. a first peristaltic pump; 82. a second peristaltic pump; 83. a third peristaltic pump; 84. a fourth peristaltic pump; 85. a fifth peristaltic pump; 86. a pinch valve; 90. a nozzle body; 91. a conical helical strip; 92. a threaded connector; 93. and (5) installing threads.

Detailed Description

For solving the not enough and defect that prior art exists, the utility model provides an online pH detection device of purifying liquid is smelted to zinc can prolong the life of pH electrode, improve equipment operating efficiency reduces artifical intensity of labour.

As shown in fig. 1 to fig. 4, wherein, fig. 1 is the structural schematic diagram of the present invention, fig. 2 is the structural schematic diagram of the middle analysis cup of the present invention, fig. 3 is the structural schematic diagram of the middle filter of the present invention, and fig. 4 is the structural schematic diagram of the middle spiral nozzle of the present invention.

An online pH detection device for zinc smelting purified liquid comprises a filter 10 and an analysis cup 20, wherein the filter 10 is provided with a purified liquid inlet 11 and a filtered liquid discharge pipe 12, and the analysis cup 20 is provided with a filtered liquid inlet 21, a pH electrode 22 and a liquid discharge port 23; wherein, the purified liquid inlet 11 is communicated with the purified liquid chute 30 through a pipeline, the filtrate discharge pipe 12 is communicated with the filtrate inlet 21 through a pipeline, and the liquid discharge port 23 is communicated with the purified liquid chute 30 through a pipeline.

Specifically, the device further comprises a first peristaltic pump 81, a second peristaltic pump 82 and a third peristaltic pump 83, wherein the first peristaltic pump 81 is communicated with the purified liquid chute 30 and the purified liquid inlet 11 and is used for pumping the purified liquid in the purified liquid chute 30 into the filter 10; a second peristaltic pump 82 communicating the filtrate discharge tube 12 and the filtrate inlet 21 for pumping the filtrate in the filter 10 into the analyzing cup 20; the third peristaltic pump 83 is connected to the drain port 23 and the purified liquid chute 30, and is used for pumping the filtrate in the analyzing cup 20 into the purified liquid chute 30.

The purified liquid in the purified liquid chute 30, the pH value of which needs to be detected, is pumped into the purified liquid inlet 11 by the first peristaltic pump 81, enters the filter 10, is filtered to obtain filtered liquid, the filtered liquid is discharged into the filtered liquid inlet 21 by the second peristaltic pump 82 through the filtered liquid discharge pipe 12, enters the analysis cup 20, the pH electrode 22 further measures the pH value of the filtered liquid, and after the measurement is finished, the filtered liquid is discharged into the purified liquid chute 30 through the third peristaltic pump 83 through the liquid discharge port 23.

Specifically, as shown in fig. 2, the analyzing cup 20 includes a cup body 24 and an end cap 25 disposed at an opening end of the cup body 24, the liquid outlet 23 is disposed at the bottom of the cup body 24, the filtrate inlet 21 is disposed on the end cap 25, the pH electrode 22 is disposed at a central position of the end cap 25, and a detection end thereof extends into the cup body 24.

More specifically, a first overflow port 26 is provided on the side wall of the cup 24, and when the filtered liquid reaches a certain height, the filtered liquid can overflow from the first overflow port 26, so as to prevent the liquid level from rising further and overflowing from the end cap 25.

More specifically, the end cap 25 is further provided with an auxiliary liquid adding port 27, and a pickling solution, clean water, a pH standard solution, and the like can be added into the analyzing cup 20 through the auxiliary liquid adding port 27, so as to facilitate the cleaning and calibration of the pH electrode 22.

More specifically, the filter 10 includes an inlet chamber 40 and a filtrate chamber 50, and the inlet chamber 40 and the filtrate chamber 50 are both stainless steel. The liquid inlet chamber 40 and the filtrate chamber 50 are communicated through a filter 60; wherein, the purifying liquid inlet 11 is arranged on the liquid inlet chamber 40, and the filtrate outlet pipe 12 is arranged on the filtrate chamber 50; the inlet chamber 40 is provided with at least one first washing nozzle 41 facing the filtering element 60, and the filtrate chamber 50 is also provided with at least one second washing nozzle 55 facing the filtering element 60, as shown in fig. 3.

In the preferred embodiment, the first and second rinse nozzles 41, 55 are both spiral nozzles. Specifically, the spiral nozzle to which the first and second washing nozzles 41 and 55 belong includes a nozzle body 90, one side of the nozzle body 90 is connected with a tapered spiral strip 91, the other side is connected with a threaded connector 92, and a mounting thread 93 is processed between the nozzle body 90 and the tapered spiral strip 91, the mounting thread 93 is an external thread and is disposed at the beginning of the tapered spiral strip 91, as shown in fig. 4. Meanwhile, corresponding positions on the liquid inlet chamber 40 and the filtrate chamber 50 are provided with female threads which are matched with the mounting threads 93 on the spiral nozzle. When the spiral spray head is installed, one end of the spiral spray head, which is provided with the conical spiral strip 91, is inserted into the liquid inlet chamber 40 or the filtrate chamber 50, the spiral spray head is screwed on the liquid inlet chamber 40 or the filtrate chamber 50 through the matching of the installation thread 93 and the internal thread, and the threaded connector 92 on the spiral spray head is connected with an external water source through a quick connector, as shown in fig. 1.

In the preferred embodiment, the first washing nozzles 41 are provided with two left and right symmetrical nozzles, as shown in fig. 1 or 3, the two first washing nozzles 41 are respectively located at the left and right sides of the bottom of the liquid inlet chamber 40, and the nozzles face the filtering member 60.

More specifically, the liquid inlet chamber 40 comprises a cavity with an upward opening, and the open end of the cavity is provided with a first flange 42; the filtrate chamber 50 includes a cylinder body penetrating up and down, a second flange 51 is provided at a lower end opening of the cylinder body, wherein the first flange 42 and the second flange 51 are connected by bolts, and as shown in fig. 3, a cavity of the liquid inlet chamber 40 is coaxially provided with the cylinder body of the filtrate chamber 50.

More specifically, the filter member 60 is a filter cloth that is sandwiched between the first flange 42 and the second flange 51, as shown in fig. 3. Two coaxial spacers 70 are further arranged between the first flange 42 and the second flange 51, wherein the filter cloth is arranged between the two spacers 70, and the first flange 42 and the second flange 51 together tightly clamp the two spacers 70 and the filter cloth.

More specifically, the filtrate chamber 50 further includes an upper cover 53, and the upper cover 53 is bolted to the upper end opening of the cylinder, as shown in fig. 3. One of the second flushing nozzles 55 is arranged at the center of the upper gland 53; the filtrate discharge pipe 12 is installed through the upper cover 53, and its lower port extends into the filtrate chamber 50. In the preferred embodiment, the upper lid 53 is further provided with an acid washing solution addition port 54, and an acid washing solution can be added to the filtrate chamber 50 through the acid washing solution addition port 54.

More specifically, a second overflow port 52 is provided on the side wall of the cylinder, and the second overflow port 52 is located at a position higher than the lower port of the filtrate discharge pipe 12, as shown in fig. 3.

In the preferred embodiment, a fourth peristaltic pump 84 and a fifth peristaltic pump 85 are also included, as shown in FIG. 1, wherein the fourth peristaltic pump 84 is used to pump air into the inlet chamber 40, and the fifth peristaltic pump 85 is used to pump air into the analysis cup 20, and wherein the air is pumped to provide agitation to the air during cleaning of the filter 10 and analysis cup 20.

In the preferred embodiment, valves are disposed between the first peristaltic pump 81 and the purification liquid inlet 11, between the fourth peristaltic pump 84 and the purification liquid inlet 11, between the third peristaltic pump 83 and the liquid outlet 23, between the fifth peristaltic pump 85 and the liquid outlet 23, between the external water source and the spiral spray head, and between the auxiliary liquid and the auxiliary liquid adding port 27, and the valves adopt pinch valves 86, as shown in fig. 1.

The utility model discloses online pH detection device of zinc smelting purifying liquid's working process as follows:

1) sampling detection process

In the zinc smelting process of zinc smelting clean shop, it has the scavenging solution to flow to keep in the scavenging solution chute 30, the utility model discloses online pH detection device of zinc smelting scavenging solution also functions simultaneously, and the scavenging solution is pumped into to first peristaltic pump 81 toward filter 10 always, and the scavenging solution obtains the filtrate after filtering of filtering piece 60, and the filter residue is then gathered in feed liquor room 40. Meanwhile, the liquid level of the filtrate chamber 50 rises, the filtrate is delivered into the analyzing cup 20 by the combination of active liquid collection by the second peristaltic pump 82 and overflow through the second overflow port 52, and the pH electrode 22 is soaked in the filtrate to complete the measurement of the pH value of the filtrate. As the filtrate continues to fill, when the level of the analyzing cup 20 exceeds the first overflow opening 26, the overflowing filtrate will be automatically introduced into the purified liquid chute 30 through the pipeline.

2) Interrupted cleaning process

The online pH detection device for zinc smelting purification liquid of the utility model generally runs for 3 minutes and needs to carry out slag discharge and cleaning operation, firstly, the first peristaltic pump 81 stops pumping the purification liquid into the filter 10 and reversely rotates to discharge the purification liquid in the filter 10; and the second peristaltic pump 82 continues to convey the filtrate into the analyzing cup 20, and after 10 seconds, the purified liquid in the liquid inlet chamber 40 is basically pumped out, at this time, the two spiral nozzles on the liquid inlet chamber 40 alternately wash the inside of the liquid inlet chamber 40 and the lower end surface of the filter element 60 at intervals of 3 seconds, and simultaneously, the spiral nozzles on the filter element 50 alternately wash the inside of the filter element 50 and the upper end surface of the filter element 60 at intervals of 3 seconds, and the process lasts for 12 seconds. During and after flushing, the first peristaltic pump 81 continues to drain until all of the liquid in the filter 10 is drained. Finally, the first peristaltic pump 81 stops discharging liquid and rotates forward, so that the purified liquid in the purified liquid chute 30 is pumped into the liquid inlet chamber 40, and the sampling detection process is continued.

3) pH electrode calibration procedure

According to aforementioned process wash filter 10 and analysis cup 20, filter 10 and analysis cup 20 wash the completion after, the utility model discloses online pH detection device of zinc smelting purifying liquid suspends the function, then adds the pickle in filter 10 and analysis cup 20 and steep and wash to let in the air and carry out the air mixing. After soaking for about 5 minutes, discharging the soaking solution, and then washing with clear water. Later manual establish the calibration flow with the pH changer, add pH standard liquid to analysis cup 20 in proper order, mark one by one, according to pH changer calibration flow calibration pH electrode 22, at last, restart the utility model discloses online pH detection device of purifying liquid is smelted to zinc continues the sampling test process.

Compared with the prior art, the utility model discloses online pH detection device of scavenging solution is smelted to zinc, the form of pH electrode direct contact scavenging solution in the past, change into and filter the scavenging solution after, the measuring method of pH electrode re-contact filtrate, can filter the most high concentration in the scavenging solution very easily forms the crystallized zinc sulfate, zinc powder suspended solid, dust and purify impurity such as flocculent particles that form among the reaction process, reduce the scale deposit and the crystallization of pH electrode, and then reduce the maintenance work of pH electrode, slow down the reduction of pH electrode precision, and then reduced the maintenance, the cost of maintenance and change. The analysis cup is arranged, the pH electrode on the analysis cup is used for measuring the pH of the filtrate, and the operation is simple, convenient and quick. Meanwhile, the filter and the analysis cup are easy to clean and maintain, the investment of manpower and time is reduced, and the production cost is reduced. The utility model discloses online pH detection device of purifying liquid is smelted to zinc can prolong the life of pH electrode, improve equipment operating efficiency reduces artifical intensity of labour, has also saved the spare parts cost of bringing because of consuming the pH electrode simultaneously.

The above-mentioned embodiments only represent one embodiment of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims (10)

1. The online pH detection device for the zinc smelting purified liquid is characterized by comprising a filter (10) and an analysis cup (20), wherein the filter (10) is provided with a purified liquid inlet (11) and a filtered liquid discharge pipe (12), and the analysis cup (20) is provided with a filtered liquid inlet (21), a pH electrode (22) and a liquid discharge port (23); the purified liquid inlet (11) is communicated with the purified liquid chute (30) through a pipeline, and the filtered liquid discharge pipe (12) is communicated with the filtered liquid inlet (21) through a pipeline; the liquid outlet (23) is communicated with the purified liquid chute (30) through a pipeline;

the purifying liquid needing to detect the pH value enters the analyzing cup (20) after being filtered by the filter (10), and the pH value is detected by the pH electrode (22).

2. The online pH detection device for the zinc smelting purification liquid according to claim 1, wherein the analysis cup (20) comprises a cup body (24) and an end cover (25) arranged at the open end of the cup body (24), the liquid discharge port (23) is arranged at the bottom of the cup body (24), the filtrate inlet (21) is arranged on the end cover (25), the pH electrode (22) is arranged on the end cover (25) in a penetrating manner, and the detection end of the pH electrode extends into the cup body (24).

3. The on-line pH detection device for the zinc smelting purification liquid according to claim 2, characterized in that a first overflow port (26) is arranged on the side wall of the cup body (24).

4. The on-line pH detection device for the zinc smelting purification liquid according to claim 2, characterized in that an auxiliary liquid adding port (27) is further arranged on the end cover (25).

5. The on-line pH detection device of the zinc smelting purification liquid according to claim 1, wherein the filter (10) comprises an inlet chamber (40) and a filtrate chamber (50), and the inlet chamber (40) is communicated with the filtrate chamber (50) through a filter element (60);

the purified liquid inlet (11) is arranged on the liquid inlet chamber (40), and the filtered liquid outlet pipe (12) is arranged on the filtered liquid chamber (50);

the liquid inlet chamber (40) is provided with at least one first flushing nozzle (41) facing the filter element (60), and the filtrate chamber (50) is provided with at least one second flushing nozzle (55) facing the filter element (60).

6. The online pH detection device for the zinc smelting purification liquid according to claim 5, wherein the first washing nozzle (41) and the second washing nozzle (55) are both spiral nozzles; the spiral nozzle comprises a nozzle body (90), one side of the nozzle body (90) is connected with a conical spiral strip (91), and the other side of the nozzle body is connected with a threaded connector (92); the shower nozzle body (90) with be provided with between toper spiral strip (91) installation screw thread (93), feed liquor room (40) with be provided with on filtrate chamber (50) with the internal thread that matches installation screw thread (93).

7. The online pH detection device for the zinc smelting purification liquid according to claim 5, wherein the liquid inlet chamber (40) comprises a cavity with an upward opening, and a first flange (42) is arranged at the open end of the cavity;

the filtrate chamber (50) comprises a cylinder body which is penetrated up and down, a second flange (51) is arranged at the lower end opening of the cylinder body, and the first flange (42) is connected with the second flange (51) through a bolt;

the filter member (60) is a filter cloth clamped between the first flange (42) and the second flange (51).

8. The online pH detection device for the zinc smelting purification liquid according to claim 7, wherein the filtrate chamber (50) further comprises an upper gland (53), and the upper gland (53) is connected to the upper end opening of the cylinder body through a bolt; the second flushing nozzle (55) is arranged on the upper gland (53); the filtrate discharge pipe (12) is arranged on the upper gland (53) in a penetrating way, and the lower port of the filtrate discharge pipe extends into the filtrate chamber (50).

9. The on-line pH detection device for the zinc smelting purification liquid according to claim 8, wherein a second overflow port (52) is arranged on the side wall of the cylinder, and the position of the second overflow port (52) is higher than the position of the lower port of the filtrate discharge pipe (12).

10. The on-line pH detection device for the zinc smelting purification liquid according to any one of claims 1 to 9, characterized by further comprising a first peristaltic pump (81), a second peristaltic pump (82) and a third peristaltic pump (83);

the first peristaltic pump (81) is communicated with the purified liquid chute (30) and the purified liquid inlet (11) and is used for pumping the purified liquid in the purified liquid chute (30) into the filter (10);

the second peristaltic pump (82) is communicated with the filtrate discharge pipe (12) and the filtrate inlet (21) and is used for pumping the filtrate in the filter (10) into the analysis cup (20);

the third peristaltic pump (83) is communicated with the liquid outlet (23) and the purified liquid chute (30) and is used for pumping the filtered liquid in the analysis cup (20) into the purified liquid chute (30).

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