CN212559789U

CN212559789U - A light salt pretreatment of water device for removing aluminium

Info

Publication number: CN212559789U
Application number: CN202022110845.XU
Authority: CN
Inventors: 韩明全
Original assignee: Jiaxing Haijie Environmental Protection Technology Co ltd
Current assignee: Jiaxing Haijie Environmental Protection Technology Co ltd
Priority date: 2020-09-23
Filing date: 2020-09-23
Publication date: 2021-02-19
Anticipated expiration: 2030-09-23

Abstract

A light brine pretreatment device for removing aluminum comprises a mixing tank, a light brine injection pipe assembly, a hydrochloric acid injection mechanism and a control device. The hydrochloric acid injection mechanism comprises a rotating shaft, a hydrochloric acid input pipe assembly and a mixing blade. The rotating shaft comprises a through groove. The hydrochloric acid inlet pipe assembly comprises a control valve. The mixing blade includes a body, a first communication slot, a second communication slot, and a nozzle. The first and second communicating slotted holes and the spray holes are respectively arranged on three adjacent side walls of the body. The control device includes positive and negative electrode plates, and a control unit. The control unit converts the voltage value into a pH value and controls the opening and closing of the control valve according to the pH value. This a light salt brine pretreatment device for removing aluminium can realize automated control, saves operating time, alleviates staff's intensity of labour.

Description

A light salt pretreatment of water device for removing aluminium

Technical Field

The utility model relates to the technical field of chemical industry, in particular to a light salt brine pretreatment device for removing aluminium.

Background

In the prior art, for some chemical liquids, a membrane filter is generally used to filter the chemical liquids to filter out impurities, so that either the filtered liquids or the filtered residues can be recycled, or both the filtered liquids and the filtered residues can be recycled. For chemical liquid containing aluminum salt, because the dilute brine coming out of the ionic membrane electric tank contains a high content of aluminum element, generally the content is about 500PPb, the pH value is generally controlled to be about 10, and the common process is difficult to remove, but according to the amphoteric characteristics of acid and alkali of the aluminum element, when the pH value of the brine is controlled to be 5-6, the aluminum element is AL (OH)₃，AL(OH)₃Is insoluble or slightly soluble in water, and can be removed by filtration. The existing membrane filter consists of a filtering membrane component, a manual control valve, a pneumatic control valve, a liquid inlet pump, an acid washing liquid pump, an outlet pressure gauge, an automatic control box and the like. The whole control process is divided into four parts of filtering, backwashing, pickling and replacing. The filtration is that a control system starts a liquid inlet pump to introduce the saline water into a filtration membrane component through a liquid inlet passage, the clear liquid flows out of the system after being filtered by the filtration membrane component, and the intercepted objects are attached to the surface of the filtration membrane. The backwashing is manually set for filtering time according to the filtering condition, the filter automatically stops filtering after running to the filtering time, and after a backwashing passage is opened, clear filtering liquid is backwashed for the filtering membrane assembly, so that the attached intercepted substances are stripped and deposited in a cavity of the membrane assembly, and then are discharged to a slag pool through a discharge pipeline, so that the filtering capacity of the membrane assembly is recovered. The acid cleaning is to clean hydrochloric acid if the surface of the filtering membrane assembly is still scaled after the filtering and backwashing operation is carried out for a period of time, the control system introduces the hydrochloric acid into the filtering membrane assembly through an acid pump, and the performance of the filtering membrane assembly is recovered through means such as hydrochloric acid aeration. Finally, theAnd (3) replacing, wherein the control system of the filtering membrane assembly after the pickling is finished can automatically replace the filtering salt water, and when the pickling solution is replaced, the system automatically enters a filtering mode. Therefore, the regulation and control effect of the pH value of the dilute brine is a key influence on whether the membrane filter can operate safely and stably for a long time.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a light brine pretreatment device for removing aluminium to satisfy above-mentioned demand.

A light brine pretreatment device for removing aluminum, wherein the light brine contains aluminum element and has a pH value larger than 7. The light brine pretreatment device for removing aluminum comprises a mixing tank, a light brine injection pipe assembly arranged on the mixing tank, a hydrochloric acid injection mechanism arranged on the mixing tank, and a control device arranged on the mixing tank. The weak brine injection pipe assembly is used for injecting the weak brine into the mixing tank. The hydrochloric acid injection mechanism comprises a rotating shaft arranged along the axial direction of the mixing tank, a hydrochloric acid input pipe assembly connected with the rotating shaft and arranged on the outer side of the mixing tank, and at least one mixing blade arranged on the side wall of the rotating shaft. The rotating shaft is a hollow tube and comprises at least one through groove. The hydrochloric acid inlet pipe assembly comprises a control valve. The mixing blade is fixed in the through groove and comprises a body, a first communication groove hole arranged on one side wall of the body, a second communication groove hole arranged on one side wall of the body, and a plurality of spray holes arranged on one side wall of the body. The first and second communicating slot holes and the spray holes are respectively arranged on three adjacent side walls of the body, and the spray holes and the first communicating slot holes are arranged on two opposite side walls. The second communication slot hole is arranged towards the hydrochloric acid input pipe assembly. The rotating shaft drives the mixing blade to rotate. The control device comprises a positive electrode plate and a negative electrode plate which are arranged on the inner side wall of the mixing tank at intervals, and a control unit which is electrically connected with the positive electrode plate and the negative electrode plate. The positive electrode plate and the negative electrode plate are used for detecting the voltage value in the liquid in the mixing tank. The control unit converts the voltage value into a pH value and controls the opening and closing of the control valve according to the pH value. When the voltage value is converted into a pH value and the pH value is larger than 6, the control unit controls the control valve to be opened, and when the pH value is smaller than 6, the control unit controls the control valve to be closed.

Further, the weak brine injection pipe assembly includes an injection pipe provided on a side wall of the mixing tank, and a first switching valve provided on the injection pipe.

Further, a central axis of the rotating shaft coincides with a central axis of the mixing tank.

Further, the hydrochloric acid input pipe assembly comprises an input pipe fixed on the mixing tank, and the control valve is arranged on the input pipe to control the on-off of the input pipe.

Further, the hydrochloric acid injection mechanism further comprises a partition plate arranged in the mixing tank and a driving mechanism arranged on the partition plate, the driving mechanism and the rotating shaft are respectively arranged on two sides of the partition plate and drive the rotating shaft to rotate, and the rotating shaft is arranged between the partition plate and the top of the mixing tank.

Further, the rotating shaft and the partition plate are arranged in a sealing mode.

Further, the light brine pretreatment device for removing aluminum still includes one and sets up discharging pipe subassembly on the lateral wall of blending tank, discharging pipe subassembly includes that one sets up discharging pipe on the lateral wall of blending tank, and one sets up the second ooff valve of discharging pipe, the discharging pipe sets up the below of input tube is located the top of baffle.

Further, the fresh brine pretreatment device for removing aluminum further comprises a pretreatment tank for receiving the fresh brine from the discharge pipe.

Compared with the prior art, the utility model provides a light salt pretreatment of water device for removing aluminium is through setting up in the blending tank hydrochloric acid injection mechanism to and set up first ooff valve on the injection tube, set up the second ooff valve on the discharging pipe, simultaneously controlling means is including setting up the positive, negative electrode plate of blending tank to can control through the magnitude of voltage that detects in the blending tank the break-make of control valve, first, second ooff valve, and then can realize automated control, save operating time, alleviate staff's intensity of labour, reduce production running cost's purpose in certain procedure. Particularly, through the structural design of the mixing blades in the hydrochloric acid injection mechanism, the dilute brine and the hydrochloric acid can be fully mixed, so that the mixing time is shortened, the production efficiency is further improved, and the time is saved.

Drawings

Fig. 1 is a schematic structural diagram of a light brine pretreatment device for removing aluminum according to the present invention.

Fig. 2 is a schematic sectional structure view of a mixing tank of the fresh brine pretreatment apparatus for removing aluminum of fig. 1.

Fig. 3 is a schematic structural view of a mixing blade provided in the fresh brine pretreatment apparatus for removing aluminum of fig. 1.

Fig. 4 is a schematic structural view of another angle of a mixing blade provided in the fresh brine pretreatment device for removing aluminum of fig. 1.

Fig. 5 is a schematic structural view of a rotary shaft of the fresh brine pretreatment device for removing aluminum of fig. 1.

Detailed Description

Specific examples of the present invention will be described in further detail below. It should be understood that the description herein of embodiments of the invention is not intended to limit the scope of the invention.

As shown in fig. 1 to 5, it is a schematic structural diagram of the fresh brine pretreatment device for removing aluminum according to the present invention. The light brine pretreatment device for removing aluminum is used for pretreating light brine. The dilute brine has aluminum element, and the pH value of the dilute brine is more than 7. The light brine pretreatment device for removing aluminum comprises a mixing tank 10, a light brine injection pipe assembly 20 arranged on the mixing tank 10, a hydrochloric acid injection mechanism 30 arranged on the mixing tank 10, a discharge pipe assembly 40 arranged on the side wall of the mixing tank, and a control device 50 arranged on the mixing tank 10. It is understood that the fresh brine pretreatment device for removing aluminum further includes other functional modules, such as assembly components, mounting components, electrical connection components, etc., which are well known to those skilled in the art and will not be described herein again.

The mixing tank 10 may be a reaction vessel disposed on a base. The mixing tank 10 may be a sealed tank body and has an opening to install various components and functional modules, such as a dilute brine injection pipe assembly 20, a hydrochloric acid injection mechanism 30, and the like.

The weak brine injection pipe assembly 20 includes an injection pipe 21 provided on a sidewall of the mixing tank 10, and a first switching valve 22 provided on the injection pipe 21. The injection pipe 21 is used for injecting the weak brine into the mixing tank 10. The first on-off valve 22 may be a manual control valve or a solenoid valve for controlling the opening and closing of the injection pipe 21. When the pretreatment of the weak brine is required, the first on-off valve 22 may be manually opened or opened by the control device 50 so that the weak brine is injected into the mixing tank 10, and the first on-off valve 22 is opened or closed when the injection amount reaches a requirement.

The hydrochloric acid injection mechanism 30 includes a partition plate 31 fixedly disposed in the mixing tank 10, a rotating shaft 32 disposed along the axial direction of the mixing tank 10 and disposed between the partition plate 31 and the top of the mixing tank 10, a hydrochloric acid inlet pipe assembly 33 connected to the rotating shaft 32 and disposed outside the mixing tank 10, at least one mixing blade 34 disposed on a side wall of the rotating shaft 32, and a driving mechanism 35 disposed on the partition plate 31. The partition plates 31 are arranged in the radial direction of the mixing tank 10, and the mixing tanks 10 are arranged in a sealing manner with each other. The central axis of the rotating shaft 32 may coincide with the central axis of the mixing tank 10, but it is of course conceivable that the rotating shaft 32 is not coincident with the central axis of the mixing tank 10, i.e. is arranged eccentrically, if the size of the mixing blades 34 is not so large, but the central axis of the rotating shaft 32 should be parallel with the central axis of the mixing tank 10. The rotating shaft 32 is a hollow tube and includes at least one through slot 321. The rotating shaft 32 is a hollow tube to facilitate the input of hydrochloric acid. The through slots 321 are used for inserting and mounting the mixing blades 34, and thus the size thereof should be comparable to the size of the mixing blades 34. Since one end of the rotating shaft 32 is disposed on the partition plate 31 and the other end is disposed on the top of the mixing tank 10, the rotating shaft 32 is connected to the partition plate 31 and the top of the mixing tank 10 by a single bearing, respectively, so that the rotating shaft 32 can rotate smoothly. It is contemplated that the bearing should be sealingly connected to the baffle 31 and the top of the mixing tank 10 to prevent the flow of liquid. The hydrochloric acid inlet pipe assembly 32 is disposed at the top of the mixing tank 10 and is connected to the rotary shaft 32 to input hydrochloric acid into the rotary shaft 32 and thus into the mixing tank 10. The hydrochloric acid inlet pipe assembly 33 includes an inlet pipe 331 hermetically connected to the rotary shaft 32, and a control valve 332 provided on the inlet pipe 331. The control valve 332 may be a solenoid valve that can be opened or closed under the control of a control signal. The number of the mixing blades 34 may be one or more, and in the present embodiment, the number of the mixing blades 34 is two. The two mixing blades 34 are symmetrically provided on the rotating shaft 32, and are symmetrically provided with the central axis of the rotating shaft 32 as a symmetry axis. Each of the mixing blades 34 is fixed in the through groove 321 and includes a body 341, a first communicating through hole 342 provided on one side wall of the body 341, a second communicating through hole 343 provided on one side wall of the body 341, and a plurality of spray holes 344 provided on one side wall of the body 341. The body 341 has a plate-like structure. The first through groove hole 342 communicates with the through groove 321 to receive hydrochloric acid from the rotary shaft 32. The first and

second communication slots

342 and 343 and the nozzle hole 344 are respectively disposed on three adjacent sidewalls of the body 341 and the nozzle hole 344 and the first communication slot 342 are disposed on two opposite sidewalls. While the first and

second communication slots

342 and 343 and the injection hole 344 communicate with each other. When hydrochloric acid is injected into the rotary shaft 32 from the hydrochloric acid inlet pipe assembly 33, the hydrochloric acid flows into the first communicating groove hole 342 from the through groove 321, and then flows into the spraying hole 344. When the rotating shaft 32 rotates, the liquid in the mixing blade 34 is rapidly ejected from the ejection holes 344 by the centrifugal force, so that a negative pressure is formed inside the mixing blade 34, and the liquid in the mixing tank 10 is pressed into the mixing blade 34 from the second communication slot 342 and ejected out through the ejection holes 13 along with the hydrochloric acid, thereby effectively improving the mixing effect between the hydrochloric acid and the dilute brine in unit time. Of course, it is contemplated that the mixing blades 34 may also function to agitate during rotation for mixing purposes. The drive mechanism 35 includes a drive motor 351. In order to reduce the volume of the mixing tank 10 and increase the mixing effect, the driving mechanism 35 further includes two bevel gears engaged with each other at 90 degrees, wherein one of the bevel gears is connected to the rotating shaft 32 to drive the rotating shaft 32 to rotate.

The discharge pipe assembly 40 includes a discharge pipe 41 provided on a side wall of the mixing tank 10, a second on-off valve 42 provided on the discharge pipe 41, and a pretreatment tank 43 for receiving treated liquid from the discharge pipe 41. The outlet pipe 41 is disposed below the inlet pipe 31 and above the partition plate 31. It is conceivable that the second on-off valve 42, which may also be a solenoid valve, is provided on the tapping pipe 41 in order to control the opening and closing of the tapping pipe 41. The pretreatment tank 43 receives the pretreated liquid, and then pumps the liquid into a filter by a liquid pump to perform filtration.

The control device 50 includes positive and

negative electrode plates

51, 52 spaced apart from each other on the inner side wall of the mixing tank 10, a high-sensitivity voltmeter 53 electrically connected to the positive and

negative electrode plates

51, 52, and a control unit 54 electrically connected to the high-sensitivity voltmeter 23. The positive and

negative electrode plates

51, 52 are used for detecting the instantaneous voltage in the mixing tank 10, and the working principle thereof should be the prior art, and will not be described herein. The high-sensitivity voltmeter53 are used to obtain the voltage values from the positive and

negative electrode plates

51, 52. The control unit 54 comprises a processor for processing the voltage value transmitted from the high-sensitivity voltmeter 53, in particular the processor converting the voltage value into a pH value, and a PLC controller. The pH value of the mixing tank 10 can be known by the pH value, so that the injection amount of the hydrochloric acid can be controlled, that is, the processor controls the opening and closing of the control valve 332 according to the pH value. Specifically, when the voltage value is converted into a pH value and the pH value is greater than 6, the control unit 54 controls the control valve 332 to open to inject hydrochloric acid. When the pH value is less than 6, specifically, when the pH value is between 5 and 6, the control unit 54 controls the control valve 332 to close, which indicates that the pretreatment of the dilute brine is completed, and the next operation can be performed. Aluminum hydroxide is an amphoteric hydroxide. Because of its existence in two ionized forms, i.e., weak acid, the acid form is H₃AlO₃Being a weak base, of the basic formula Zeza Al (OH)₃Thus, aluminum hydroxide has amphoteric properties and reacts with both acids and bases. However, when the pH value is 5-6, the aluminum hydroxide is not dissolved, so that the aluminum hydroxide can be treated by filtration at the pH value. The PLC controller is a conventional controller, and is not described herein in detail, and is configured to control the opening and closing of the control valve 332, the first and second on-off

valves

22 and 42 according to control information of the processor.

The utility model also provides a light salt brine pretreatment method for removing aluminium, it includes following step:

STEP 101: providing the above-mentioned fresh brine pretreatment apparatus for removing aluminum, injecting fresh brine into the mixing tank 10 through the fresh brine injection pipe assembly 20;

STEP 102: measuring the voltage value of the liquid in the mixing tank 10 by the positive and

negative electrode plates

51, 52, and converting the voltage value into a pH value by the control unit 54;

STEP 103: the control unit 54 controls the rotation shaft 32 to start rotating when the pH is greater than 6;

STEP 104: when the pH value is more than 6, the control unit 54 controls the control valve 332 to be opened so as to inject hydrochloric acid into the mixing tank 10 until the pH value in the mixing tank 10 is reduced to 5-6;

STEP 105: and when the pH value is reduced to 5-6, closing the control valve 332 and stopping injecting the hydrochloric acid into the mixing tank.

STEP106, opening the second on-off valve 42 to flow the acid-treated liquid into the pretreatment tank 43 and pumping the liquid into a filter by a pump for filtration.

Compared with the prior art, the utility model provides a light salt brine pretreatment device for removing aluminium is through setting up in the blending tank hydrochloric acid injection mechanism 30 to and set up first ooff valve 22 on filling tube 20, set up second ooff valve 42 on discharging tube 42, simultaneously controlClothes (CN)The device 50 comprises positive and

negative electrode plates

51 and 52 arranged on the mixing tank 10, so that the on-off of the control valve 332 and the first and

second switch valves

22 and 42 can be controlled by detecting the voltage value in the mixing tank 10, thereby realizing automatic control, saving operation time, reducing the labor intensity of workers and reducing the production and operation cost in a certain procedure. Particularly, through the structural design of the mixing blade 34 in the hydrochloric acid injection mechanism 30, the dilute brine and the hydrochloric acid can be sufficiently mixed, so that the mixing time is shortened, the production efficiency is further improved, and the time is saved.

The above description is only for the preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention, and any modification, equivalent replacement or improvement within the spirit of the present invention is encompassed by the claims of the present invention.

Claims

1. A dilute brine pretreatment device for removing aluminum, wherein the dilute brine contains aluminum element and has a pH value greater than 7, the device characterized in that: the light brine pretreatment device for removing aluminum comprises a mixing tank, a light brine injection pipe assembly arranged on the mixing tank, a hydrochloric acid injection mechanism arranged on the mixing tank, and a control device arranged on the mixing tank, wherein the light brine injection pipe assembly is used for injecting the light brine into the mixing tank, the hydrochloric acid injection mechanism comprises a rotating shaft arranged along the axial direction of the mixing tank, a hydrochloric acid input pipe assembly connected with the rotating shaft and arranged on the outer side of the mixing tank, and at least one mixing blade arranged on the side wall of the rotating shaft, the rotating shaft is a hollow pipe and comprises at least one through groove, the hydrochloric acid input pipe assembly comprises a control valve, the mixing blade is fixed in the through groove and comprises a body, and a first communication groove hole arranged on one side wall of the body, a second communicating slot hole arranged on one side wall of the body and a plurality of spray holes arranged on one side wall of the body, wherein the first communicating slot hole, the second communicating slot hole and the spray holes are respectively arranged on three adjacent side walls of the body, the spray holes and the first communicating slot hole are arranged on two opposite side walls, the second communicating slot hole is arranged towards the hydrochloric acid input pipe assembly, the rotating shaft drives the mixing blade to rotate, the control device comprises a positive electrode plate and a negative electrode plate which are arranged on the inner side wall of the mixing tank at intervals, and a control unit which is electrically connected with the positive electrode plate and the negative electrode plate, the positive electrode plate and the negative electrode plate are used for detecting the voltage value in the liquid in the mixing tank, the control unit converts the voltage value into a pH value and controls the opening and closing of the control valve according to the pH value, when the voltage value is converted into a pH value and the pH value is larger than 6, the control unit controls the control valve to be opened, and when the pH value is smaller than 6, the control unit controls the control valve to be closed.

2. The light brine pretreatment device for removing aluminum according to claim 1, characterized in that: the weak brine injection pipe assembly comprises an injection pipe arranged on the side wall of the mixing tank and a first switch valve arranged on the injection pipe.

3. The light brine pretreatment device for removing aluminum according to claim 1, characterized in that: the central axis of the rotating shaft coincides with the central axis of the mixing tank.

4. The light brine pretreatment device for removing aluminum according to claim 1, characterized in that: the hydrochloric acid input pipe assembly comprises an input pipe fixed on the mixing tank, and the control valve is arranged on the input pipe to control the on-off of the input pipe.

5. The light brine pretreatment device for removing aluminum according to claim 4, wherein: the hydrochloric acid injection mechanism further comprises a partition plate arranged in the mixing tank and a driving mechanism arranged on the partition plate, the driving mechanism and the rotating shaft are respectively arranged on two sides of the partition plate and drive the rotating shaft to rotate, and the rotating shaft is arranged between the partition plate and the top of the mixing tank.

6. The light brine pretreatment device for removing aluminum according to claim 5, wherein: the rotating shaft and the partition plate are arranged in a sealing mode.

7. The light brine pretreatment device for removing aluminum according to claim 5, wherein: the light brine pretreatment device for removing aluminum further comprises a discharge pipe assembly arranged on the side wall of the mixing tank, the discharge pipe assembly comprises a discharge pipe arranged on the side wall of the mixing tank and a second switch valve arranged on the discharge pipe, and the discharge pipe is arranged below the input pipe and located above the partition plate.

8. The light brine pretreatment device for removing aluminum according to claim 7, wherein: the light brine pretreatment device for removing aluminum also comprises a pretreatment tank for receiving the light brine from the discharge pipe.