Absorption and desorption device for extracting lithium from shale gas produced water

Abstract

The utility model relates to the technical field of lithium extraction, in particular to an adsorption and desorption device for extracting lithium from shale gas produced water, which comprises a treatment tank, a three-way pipe, a lithium ion concentration detection mechanism and a controller, an adsorption pipe is arranged in the treatment tank, a plurality of adsorption layers for adsorbing lithium ions are arranged in the adsorption pipe, and the three-way pipe is connected with the adsorption layer. The input end of the adsorption pipe is connected with a liquid inlet pipe used for discharging shale gas collection wastewater, the three-way pipe is communicated with the output end of the adsorption pipe, and the two output ends of the three-way pipe are communicated with a collection water circulation pipeline and a desorption agent circulation pipeline. The two layers are fully contacted with the adsorption layer, so that the adsorption and desorption quantity of the lithium ions is improved, and the problem that the lithium extraction efficiency is relatively low as the lithium ions are not completely adsorbed and desorbed in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium extraction technical field especially is involved in a kind of shale gas produced water lithium extraction suction and detachment device. BACKGROUND

[0002] In the shale gas exploitation process, the main purpose of using the collected water is to help open the underground rock layer so that natural gas can be extracted, however, in this process, the underground water and the natural water in the formation will interact with the mineral composition in the rock, resulting in various dissolved minerals in the water, which includes lithium, lithium is a valuable metal, widely used in batteries, ceramics, glass, medicine and other fields, extracting lithium from collected wastewater can realize resource recycling, through purification process such as lithium extraction, wastewater can reach the standard of recycling, reduce water pollution, the common lithium extraction method is to adsorb lithium in wastewater on adsorbent through the adsorption of adsorbent, and then desorption treatment is carried out on the adsorbent by desorption liquid, so as to obtain lithium.

[0003] At present, when lithium extraction treatment is carried out on the produced water of shale gas, the wastewater is directly passed through the adsorbent, and then the desorption liquid is introduced for desorption treatment, the lithium ions in the wastewater may not be completely adsorbed, and when the desorption liquid is used to desorb the adsorbent, the lithium ions in the adsorption layer cannot be completely desorbed, resulting in low lithium extraction efficiency. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of shale gas produced water lithium extraction suction and detachment device to solve the problem that lithium ion is not completely adsorbed and desorbed in prior art, resulting in low lithium extraction efficiency.

[0005] The technical problem solved by the utility model is realized by the following technical scheme:

[0006] A kind of shale gas produced water lithium extraction suction and detachment device, including processing jar, three-way pipe, lithium ion concentration detection mechanism and controller, the inside of the processing jar is equipped with adsorption pipe, the inside of the adsorption pipe is equipped with multiple adsorption layers for adsorbing lithium ion, the input end of the adsorption pipe is connected with liquid inlet pipe for shale gas collection wastewater discharge, the three-way pipe is connected with the output end of adsorption pipe, and the two output ends of the three-way pipe are communicated with collection water circulation pipeline and desorption agent circulation pipeline, the lithium ion concentration detection mechanism is arranged in collection water circulation pipeline and desorption agent circulation pipeline, for real-time detection of lithium ion concentration in collection water and desorption agent, the controller is used to receive the signal of lithium ion concentration detection mechanism Control the opening and closing of collection water circulation pipeline and desorption agent circulation pipeline.

[0007] Preferably, the collecting water circulation pipeline and the desorption agent circulation pipeline each comprise a circulation pipeline and a water pump arranged on the circulation pipeline, and a temporary storage tank and a first electromagnetic valve are arranged on the circulation pipeline, and the output end of the circulation pipeline is connected with the input end of the adsorption pipe.

[0008] Preferably, a liquid delivery pipe is communicated with the two temporary storage tanks, and a second electromagnetic valve is arranged on the liquid delivery pipe.

[0009] Preferably, the adsorption pipe is spiral or serpentine.

[0010] Preferably, the adsorption pipe is internally provided with a plurality of turbulence columns.

[0011] Preferably, the input end of the liquid inlet pipe is connected with an external collecting water supply device, and a third electromagnetic valve is arranged on the liquid inlet pipe.

[0012] The utility model has the beneficial effect that: through the collecting water circulation pipeline, the collected waste water increases the contact opportunity with the adsorption layer, more fully adsorbs the lithium ion in the water, and the lithium ion concentration in the collected water and the desorption agent is detected in real time through the lithium ion concentration detection mechanism, when the lithium ion concentration in the collecting water circulation pipeline is detected to be lower than the set threshold value, the collecting water circulation pipeline is closed, the desorption agent circulation pipeline is started, the desorption agent reciprocally contacts the adsorption layer, and the lithium ion is desorbed, when the lithium ion concentration in the desorption agent circulation pipeline is detected to be higher than the set threshold value, it indicates that the desorption degree of the lithium ion in the adsorption layer reaches a certain degree, and subsequent treatment can be carried out, thereby improving the lithium ion extraction amount. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without the creative labor of the ordinary skilled in the art.

[0014] Figure 1 The utility model provides an isometric structure schematic diagram:

[0015] Figure 2 The utility model provides a cross section structure schematic diagram:

[0016] Figure 3 The utility model provides an adsorption pipe cross section structure schematic diagram:

[0017] Figure 4 The utility model provides a principle block diagram.

[0018] In the figure, 1, processing tank; 11, adsorption pipe; 12, third electromagnetic valve; 13, liquid inlet pipe; 2, adsorption layer; 3, three-way pipe; 4, collection water circulation pipeline; 41, circulation pipeline; 42, water pump; 43, temporary storage tank; 44, first electromagnetic valve; 5, desorption agent circulation pipeline; 51, infusion tube; 52, second electromagnetic valve; 6, lithium ion concentration detection mechanism; 7, controller; 8, turbulence column. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific drawings.

[0020] As Figures 1-4 shown, a shale gas produced water lithium extraction adsorption and desorption device, including processing tank 1, the inside of processing tank 1 is equipped with adsorption pipe 11, the inside of adsorption pipe 11 is equipped with multiple adsorption layers 2 for adsorbing lithium ions, adsorption layer 2 can be lithium ion exchange resin, etc., through the reversible exchange action of functional groups and lithium ions in solution, thereby realizing the selective adsorption of lithium ions, the input end of adsorption pipe 11 is connected with liquid inlet pipe 13, the input end of liquid inlet pipe 13 is connected with external collection water supply equipment, and the third electromagnetic valve 12 is arranged on the liquid inlet pipe 13, the third electromagnetic valve 12 is opened, shale gas collection wastewater is discharged into adsorption pipe 11 through liquid inlet pipe 13, then lithium ions in wastewater are adsorbed by adsorption layer 2, the number of adsorption layer 2 is multiple, the wastewater passing through adsorption pipe 11 can be adsorbed multiple times, and the adsorption effect of lithium ions is better, the output end of adsorption pipe 11 is connected with three-way pipe 3, two output ends of three-way pipe 3 are communicated with collection water circulation pipeline 4 and desorption agent circulation pipeline 5, respectively for circulating collection water and desorption agent, lithium ion concentration detection mechanism 6 is further arranged in collection water circulation pipeline 4 and desorption agent circulation pipeline 5, for real-time detection of lithium ion concentration in collection water and desorption agent, and the detection result is transmitted to controller 7 to control the opening and closing of collection water circulation pipeline 4 and desorption agent circulation pipeline 5 by controller 7;

[0021] Specifically, after the collected wastewater enters the adsorption pipe 11 through the liquid inlet pipe 13, the desorption agent circulation pipeline 5 and the third electromagnetic valve 12 are closed, the collected wastewater is circulated back and forth through the collected water circulation pipeline 4, so that the collected wastewater repeatedly passes through the adsorption pipe 11 and contacts the adsorption layer 2, thereby increasing the contact time with the adsorption layer 2, so as to sufficiently adsorb the lithium ions in the collected wastewater, and the lithium ion concentration in the collected wastewater is detected by the lithium ion concentration detection mechanism 6 in the collected water circulation pipeline 4, when the lithium ion concentration is detected to be less than the set threshold value, the lithium ions in the collected wastewater are adsorbed to a certain extent, and a small amount of lithium ions remain, and the discharge standard can be reached, at this time, the signal is transmitted to the controller 7, the controller 7 controls the collected water circulation pipeline 4 to be closed, and the desorption agent circulation pipeline 5 is opened, so that the desorption agent enters the adsorption pipe 11 back and forth and contacts the adsorption layer 2, thereby desorbing the lithium ions adsorbed by the adsorption layer 2, as the lithium ion concentration in the adsorption liquid increases, the lithium ion concentration also increases, when the lithium ion concentration detection mechanism 6 in the desorption agent circulation pipeline 5 detects that the lithium ion concentration reaches the set maximum threshold value, the desorption agent circulation pipeline 5 is opened, the desorption agent is discharged, and subsequent processing of the lithium ion extraction process is performed, the desorption agent can be a high-concentration salt solution or an acid-alkali solution, etc., the high-concentration ions in the desorption agent can displace the lithium ions on the resin of the adsorption layer 2, and the lithium ion concentration detection mechanism 6 can be an online ion selective electrode, an online ultraviolet-visible spectrophotometer, etc., which is electrically connected with the controller 7 to detect the lithium ion concentration in real time.

[0022] Further, the collected water circulation pipeline 4 and the desorption agent circulation pipeline 5 each include a circulation pipeline 41 and a water pump 42 arranged on the circulation pipeline 41, a temporary storage tank 43 and a first electromagnetic valve 44 electrically connected with the controller 7 are arranged on the two circulation pipelines 41, the output end of the circulation pipeline 41 is connected with the input end of the adsorption pipe 11, the collected water or the desorption agent in the temporary storage tank 43 is extracted by the water pump 42 to realize circulation of the collected water and the desorption agent, the collected water or the desorption agent flowing out of the adsorption pipe 11 enters the temporary storage tank 43 again to be temporarily stored, so as to ensure that the collected water and the desorption agent have sufficient amount for circulation, when the collected water needs to be discharged, the controller 7 closes the first electromagnetic valve 44 on the desorption agent circulation pipeline 5, when the desorption agent circulates, the controller 7 closes the first electromagnetic valve 44 on the collected water circulation pipeline 4.

[0023] The two temporary storage tanks 43 are communicated with liquid delivery pipes 51, and the second electromagnetic valves 52 are arranged on the liquid delivery pipes 51; when the lithium ion concentration in the collected wastewater is lower than the set threshold value, the collected wastewater needs to be discharged without circulation, the first electromagnetic valve 44 on the desorption agent circulation pipeline 5 can be closed, the first electromagnetic valve 44 and the second electromagnetic valve 52 on the collected water circulation pipeline 4 are opened, and the collected wastewater is discharged; on the contrary, when the desorption liquid needs to be discharged or added, the second electromagnetic valve 52 on the desorption liquid circulation pipeline can be opened to inject or discharge the desorption liquid.

[0024] Further, as shown in Figure 2 The adsorption pipe 11 is spiral or serpentine, which prolongs the length of the adsorption pipe 11 in limited space, makes the flow path of the collected wastewater in the spiral or serpentine pipe more complex, increases the collision and contact opportunities of the collected wastewater and the adsorption layer 2, can more effectively utilize the pipe space, and improves the adsorption efficiency.

[0025] And, as shown in Figure 3 The inside of the adsorption pipe 11 is provided with a plurality of turbulence columns 8, which can further disturb the flow state of the wastewater, promote the wastewater or the desorption agent to be more fully mixed with the adsorption layer 2, improve the uniformity and efficiency of adsorption or desorption, and can increase the turbulence degree of the wastewater or the desorption agent, so that it can more frequently contact with the adsorption layer 2, which helps to speed up the process of adsorption or desorption.

[0026] The basic principle and main features of the present application and the advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principle of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An adsorption and desorption device for lithium extraction from shale gas produced water, characterized in that, Include; The processing tank (1) is internally provided with an adsorption pipe (11), the inside of the adsorption pipe (11) is provided with a plurality of adsorption layers (2) for adsorbing lithium ions, and the input end of the adsorption pipe (11) is connected with a liquid inlet pipe (13) for shale gas collection wastewater discharge; The tee pipe (3) is communicated with the output end of the adsorption pipe (11), and the two output ends of the tee pipe (3) are communicated with a collection water circulating pipeline (4) and a desorption agent circulating pipeline (5); The lithium ion concentration detection mechanism (6) is arranged in the collection water circulating pipeline (4) and the desorption agent circulating pipeline (5), and is used for detecting the lithium ion concentration in the collection water and the desorption agent in real time; The controller (7) is used for receiving the signal of the lithium ion concentration detection mechanism (6) to control the opening and closing of the collection water circulating pipeline (4) and the desorption agent circulating pipeline (5).

2. The adsorption and desorption device for extracting lithium from shale gas produced water according to claim 1, characterized in that, The collection water circulating pipeline (4) and the desorption agent circulating pipeline (5) each include a circulating pipeline (41) and a water pump (42) arranged on the circulating pipeline (41), two circulating pipelines (41) are each provided with a temporary storage tank (43) and a first electromagnetic valve (44), and the output end of the circulating pipeline (41) is connected with the input end of the adsorption pipe (11).

3. The adsorption and desorption device for lithium extraction from shale gas produced water according to claim 2, characterized in that, Two temporary storage tanks (43) are each communicated with a liquid delivery pipe (51), and the liquid delivery pipe (51) is provided with a second electromagnetic valve (52).

4. The adsorption and desorption device for extracting lithium from shale gas produced water according to claim 1, characterized in that, The adsorption pipe (11) is spiral or serpentine.

5. The adsorption and desorption device for lithium extraction from shale gas produced water according to claim 1, characterized in that, The inside of the adsorption pipe (11) is provided with a plurality of turbulence columns (8).

6. The adsorption and desorption device for lithium extraction from shale gas produced water according to claim 1, characterized in that, The input end of the liquid inlet pipe (13) is connected with an external collection water supply device, and the liquid inlet pipe (13) is provided with a third electromagnetic valve (12).

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