Nanofiltration membrane element testing device

Abstract

The utility model discloses a nanofiltration membrane element testing device and relates to the technical field of membrane preparation. Comprising a membrane shell, a membrane mounting cavity matched with a membrane element is formed in the membrane shell, an end cover detachably and fixedly connected is arranged at the front end, a pure water pipe communicated with the membrane mounting cavity is arranged at the tail end, and a sampling pipe I controlled by a sampling valve I is arranged on the pure water pipe; a water inlet pipe and a concentrated water pipe which are communicated with the mounting cavity are arranged on the outer side of the membrane shell. The sampling pipe I samples and tests water production conductance, pulls out the feeding piston after the equipment operates stably, and adds slaked lime powder; and the added slaked lime powder and magnesium ions in water generate magnesium hydroxide precipitates, so that the magnesium ions are removed. The total conductivity of the pure water is tested by the sampling tube I, divalent salt is completely precipitated after a series of treatment of the liquid storage tank I, and the conductivity of monovalent salt in the pure water is tested by the sampling tube II. The conductance of the divalent salt in the pure water is obtained by subtracting the testing conductance of the sampling tube I from the testing conductance of the sampling tube II, so that the rejection rate of salt ions with different valence states in the mixed solution is measured simultaneously.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of membrane preparation technology, especially to nanofiltration membrane element testing arrangement. BACKGROUND

[0002] Nanofiltration membrane has excellent salt separation performance, and its separation performance for salt ions of different valences can be regulated by adjusting the crosslinking structure of poly (piperazine amide). At present, nanofiltration products with high retention rate for divalent salt and almost no retention rate for monovalent salt are more used in the market, especially in the field of lithium extraction from salt lake. However, nanofiltration membranes with the same retention rate for divalent salt and monovalent salt have gradually appeared in the market as a new technical requirement.

[0003] Therefore, the retention rate of nanofiltration membrane for salt ions of different valences is the most important performance. At present, monovalent and divalent salt solutions are used respectively for testing to characterize the performance of nanofiltration membrane. However, in actual application, it is a mixed solution of salt ions of different valences, and the retention rate of the membrane for salt ions of different valences in the mixed solution is often quite different from the retention rate measured in a single solution. Therefore, the user may make a wrong selection according to the test results of a single solution. SUMMARY

[0004] The utility model provides a nanofiltration membrane element testing arrangement that is compact in structure, simple and efficient in testing, and realizes online testing of mixed solution of salt ions of different valences.

[0005] The technical scheme of the utility model is as follows:

[0006] The nanofiltration membrane element testing arrangement comprises:

[0007] The membrane shell is internally provided with a membrane mounting cavity matched with the membrane element, the front end is provided with a detachably fixed end cover, and the tail end is provided with a pure water pipe communicated with the membrane mounting cavity, and the pure water pipe is provided with a sampling pipe one controlled by a sampling valve one;

[0008] The liquid storage pool is communicated with the pure water pipe at one end and provided with a sampling pipe two controlled by a sampling valve two at the other end, the middle part of the liquid storage pool is provided with a feed inlet, and the gas pipe is arranged close to the sampling pipe two.

[0009] Specifically, the water inlet pipe is provided with a pressure gauge.

[0010] Specifically, the water inlet pipe is connected with the raw water pump.

[0011] Specifically, the concentrated water pipe is provided with a concentrated water valve.

[0012] Specifically, the gas pipe is provided with a gas control valve.

[0013] Specific, the reservoir cavity is U-shaped structure, its bottom surface is a plane;

[0014] The reservoir is internally provided with a magnetic force rotor, and is externally provided with a magnetic force stirrer matched with the magnetic force rotor.

[0015] Specific, the sampling tube two and the reservoir are provided with a filter screen.

[0016] Specific, the filter screen is located above the air pipe.

[0017] Specific, the feeding inlet is externally provided with a feeding pipe communicated with the inner cavity.

[0018] The feeding pipe is internally provided with a feeding piston matched with the feeding pipe.

[0019] Specific, the feeding piston is externally provided with a sealing ring matched with the inner sidewall of the feeding pipe.

[0020] The utility model discloses a membrane shell and reservoir are connected, the end of membrane shell is equipped with sampling tube one, and the end of reservoir is equipped with sampling tube two. Sampling tube one samples and tests water production conductivity, after the equipment runs stably, pulls out feeding piston 610, and adds slaked lime powder. The slaked lime powder and magnesium ion in water generate magnesium hydroxide precipitate, thereby removing magnesium ion. The total conductivity of pure water is tested by sampling tube one, after a series of treatments of reservoir, all divalent salt generates precipitate, and the conductivity of monovalent salt in pure water is tested by sampling tube two. The conductivity of divalent salt in pure water is obtained by subtracting the conductivity of sampling tube two from the conductivity of sampling tube one, which realizes the interception rate of different valence salt ions in mixed solution at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the structure schematic diagram of the utility model,

[0022] In the drawing, 100 is a membrane shell, 110 is an end cover, 120 is a pure water pipe, 121 is a sampling tube one, 130 is a concentrated water pipe, 131 is a concentrated water valve, 140 is a water inlet pipe, 141 is a pressure gauge,

[0023] 200 is a reservoir, 210 is a sampling tube two, 220 is an air pipe,

[0024] 300 is a raw water pump,

[0025] 410 is a magnetic force rotor, and 420 is a magnetic force stirrer,

[0026] 500 is a filter screen, 600 is a feeding pipe, and 610 is a feeding piston. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used merely for the purpose of explaining the present application, and should not be construed as limiting the present application.

[0028] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "vertical", "horizontal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0029] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] The following will be described with reference to Figure 1 The present application is described;

[0031] The nanofiltration membrane element testing device comprises:

[0032] The membrane shell (100) is internally provided with a membrane mounting cavity matched with the membrane element, the front end is provided with a detachably fixed end cover (110), the membrane element is placed in the matched membrane mounting cavity by detaching the end cover 110, the tail end is provided with a pure water pipe (120) communicated with the membrane mounting cavity, the pure water pipe (120) is provided with a sampling pipe one (121) controlled by a sampling valve one; the outer side of the membrane shell (100) is provided with a water inlet pipe (140) and a concentrated water pipe (130) communicated with the mounting cavity;

[0033] The reservoir (200) is communicated with the pure water pipe (120) at one end and is provided with a sampling pipe two (210) controlled by a sampling valve two at the other end. The reservoir (200) is provided with a feed inlet at the middle part and is provided with an air pipe (220) near the sampling pipe two (210). The feed inlet is provided with a feed pipe (600) communicated with the inner cavity. The feed pipe (600) is provided with a feed piston (610) matched therewith. The feed piston (610) is provided with a sealing ring matched with the inner wall of the feed pipe (600).

[0034] The water inlet pipe (140) is provided with a pressure gauge (141) and is connected with the raw water pump (300).

[0035] The concentrated water pipe (130) is provided with a concentrated water valve (131).

[0036] The air pipe (220) is provided with a gas control valve.

[0037] The inner cavity of the reservoir (200) is in a U-shaped structure, and the bottom surface is a plane. The reservoir (200) is provided with a magnetic rotor (410) and a magnetic stirrer (420) matched with the magnetic rotor below.

[0038] The sampling pipe two (210) and the reservoir (200) are provided with a filter screen (500). The filter screen (500) is located above the air pipe (220). The filter screen is used for filtering the generated calcium magnesium carbonate and magnesium hydroxide precipitate. At the same time, it ensures that the added slaked lime does not flow out of the reservoir with water.

[0039] The use method of the device is:

[0040] Firstly, the end cap 110 of the membrane shell 100 is disassembled, the membrane element is installed into the membrane shell, and the end cap is installed.

[0041] Then, the raw water pump 300 is started, the test liquid passes through the raw water pump 300 into the membrane shell 100, and the membrane pressure and system recovery rate are controlled by adjusting the motor frequency of the raw water pump 300 and the concentrated water valve 131.

[0042] The sampling pipe one 121 samples and tests the water production conductivity. After the equipment is stable, the feed piston 610 is pulled out, the slaked lime powder is added, until the solubility upper limit is reached, the feed piston 610 pushes the feed pipe 600. The added slaked lime powder and the magnesium ions in the water generate magnesium hydroxide precipitate, so as to remove the magnesium ions.

[0043] Start the magnetic stirrer 420, the magnetic rotor 410 is stirred, calcium and magnesium ions are divalent salt in water, add lime and pass carbon dioxide to make the divalent salt precipitate, so that the pure water in the sampling port two contains only monovalent salt, that is, magnesium ions and calcium hydroxide react to produce magnesium hydroxide precipitate, while the gas pipe 220 passes carbon dioxide gas into the liquid storage tank 200 to produce calcium carbonate and magnesium carbonate precipitate. Sample test conductivity from sampling tube two 210. The test conductivity of sampling tube one 121 is the total conductivity of pure water, and the test conductivity of sampling tube two 210 is the conductivity of monovalent salt in pure water. The test of sampling tube one 121 is the total conductivity of pure water, and after a series of treatments in the liquid storage tank 200, all divalent salts are precipitated, and the test of sampling tube two 210 is the conductivity of monovalent salt in pure water. The test conductivity of sampling tube one 121 minus the test conductivity of sampling tube two 210 is the conductivity of divalent salt in pure water. The interception rate of different valence salt ions in the mixed solution is realized at the same time.

[0044] For the content disclosed in the case, the following points need to be explained:

[0045] (1) The embodiment disclosed in the case only involves the structure involved in the embodiment disclosed in the case, and other structures can refer to the usual design.

[0046] (2) In the case of no conflict, the embodiments disclosed in the case and the features in the embodiments can be combined to obtain new embodiments;

[0047] The above is only a specific embodiment disclosed in the case, but the protection scope of the disclosure is not limited to this. The protection scope of the disclosure disclosed in the case should be subject to the protection scope of the claims.

Claims

1. A nanofiltration membrane element testing apparatus, characterized by, The application relates to a water purifying device, which comprises the following parts: a membrane shell (100) internally provided with a membrane mounting cavity matched with a membrane element, a detachably fixed end cover (110) arranged at the front end of the membrane shell (100), a pure water pipe (120) arranged at the tail end of the membrane shell (100) and communicated with the membrane mounting cavity, a sampling pipe I (121) controlled by a sampling valve I arranged on the pure water pipe (120), a water inlet pipe (140) and a concentrated water pipe (130) arranged on the outer side of the membrane shell (100) and communicated with the mounting cavity; a liquid storage tank (200) communicated with the pure water pipe (120) at one end and provided with a sampling pipe II (210) controlled by a sampling valve II at the other end, a feed inlet arranged in the middle of the liquid storage tank (200) and an air pipe (220) arranged close to the sampling pipe II (210).

2. The nanofiltration membrane element testing device of claim 1, wherein, A pressure gauge (141) is arranged on the water inlet pipe (140).

3. The nanofiltration membrane element testing device of claim 1, wherein, The water inlet pipe (140) is connected with a raw water pump (300).

4. The nanofiltration membrane element testing device of claim 1, wherein, A concentrated water valve (131) is arranged on the concentrated water pipe (130).

5. The nanofiltration membrane element testing device of claim 1, wherein, An air control valve is arranged on the air pipe (220).

6. The nanofiltration membrane element testing device of claim 1, wherein, The inner cavity of the liquid storage tank (200) is in a U-shaped structure, and the bottom surface is a plane. A magnetic force rotor (410) is arranged in the liquid storage tank (200), and a magnetic force stirrer (420) matched with the magnetic force rotor is arranged below the magnetic force rotor.

7. The nanofiltration membrane element testing device of claim 1, wherein, A filter screen (500) is arranged between the sampling pipe II (210) and the liquid storage tank (200).

8. The nanofiltration membrane element testing device of claim 7, wherein, The filter screen (500) is arranged above the air pipe (220).

9. The nanofiltration membrane element testing device of claim 1 or 6, wherein, A feed pipe (600) communicated with the inner cavity is arranged on the feed inlet. A feed piston (610) matched with the feed pipe (600) is arranged in the feed pipe (600).

10. The nanofiltration membrane element testing device of claim 9, wherein, A sealing ring matched with the inner side wall of the feed pipe (600) is arranged on the feed piston (610).

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