CN216526311U - Pretreatment device suitable for separating strontium-90 by ion exchange method - Google Patents

Abstract

The utility model discloses a pretreatment device suitable for separating strontium-90 by an ion exchange method, which comprises a liquid mixing box, a sample inlet pipe, an online pH value measuring instrument, an ion exchange resin column, an addition pump, a combined pump, a regeneration pump, a controller, a strontium concentrated solution reagent bottle, a high-purity water bottle, a sodium chloride solution reagent bottle, a strontium desorption solution reagent bottle, a sodium hydroxide solution reagent bottle, a hydrochloric acid solution reagent bottle, an acetic acid-ammonium acetate solution reagent bottle, a strontium carrier solution reagent bottle and a waste liquid pool. The adding pump, the combined pump and the regeneration pump are used for communicating each reagent bottle to the corresponding liquid mixing box, the online pH value measuring instrument and the ion exchange resin column through pipelines, so that the conversion from the traditional manual operation separation of strontium-90 to the mechanical operation separation of strontium-90 is realized, the separation with high efficiency and high stability is realized, and the risk of personal injury is also reduced.

Description

Pretreatment device suitable for separating strontium-90 by ion exchange method

Technical Field

The utility model relates to the technical field of radiochemical analysis and monitoring, in particular to a pretreatment device suitable for separating strontium-90 by an ion exchange method.

Background

Strontium (Sr) belongs to alkaline earth metal, has chemical property similar to calcium, and is easy to deposit on biological skeleton. Wherein, the strontium-90 has longer half-life period (28.79a) and belongs to radioactive metal elements which have larger harm to human bodies. The liquid effluent of the nuclear power plant contains a trace amount of strontium-90 nuclide, so that the specific activity of strontium-90 needs to be regularly monitored for the liquid effluent of the nuclear power plant and a water sample of the environment surrounding the nuclear power plant.

When the specific activity of strontium-90 in a liquid sample is analyzed by adopting an ion exchange method in HJ 815-2016 water and a radiochemical analysis method for strontium-90 in biological sample ash, the sample amount required to be collected and transported is large, the analysis process consumes long time, and the steps of sample introduction, desorption, resin regeneration and the like in the pretreatment process are usually manually operated. Manual operation makes the operating personnel closely contact nuclear pollutant for a long time, has increased radiation dose, uses multiple acid-base reagent moreover in the whole process, has increased operating personnel's injured risk to long-time repetition is with the same during operation, makes operating personnel produce numb and thoughtful idle mood easily, makes work efficiency reduce, and the analysis result takes place the error. Reviewing the treatment process of the whole ion exchange method, the steps of sampling, sample introduction, desorption, resin regeneration and the like are simple and repetitive work, so that a treatment device can be designed for treatment, the burden of operators is reduced, the time for the operators to contact nuclear pollutants is shortened, the risk that the operators are injured by acid-base reagents is reduced, and the stability of an analysis result is improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a pretreatment device suitable for separating strontium-90 by an ion exchange method, which solves the problems of low efficiency caused by pure manual operation in the prior art of strontium-90 pre-extraction process, personal injury, unstable analysis result and how to accurately quantify a reagent in the process of converting manual operation into automatic operation.

The technical scheme of the utility model is realized as follows:

a pretreatment device suitable for separating strontium-90 by an ion exchange method comprises a liquid mixing box, a sample inlet pipe, an online pH value measuring instrument, an adding pump, a combined pump, a regenerative pump, an ion exchange resin column, a controller, a strontium concentrated solution reagent bottle, a high-purity water bottle, a sodium chloride solution reagent bottle, a strontium desorption solution reagent bottle, a sodium hydroxide solution reagent bottle, a hydrochloric acid solution reagent bottle, an acetic acid-ammonium acetate solution reagent bottle, a strontium carrier solution reagent bottle and a waste liquid pool;

wherein one end of the sample inlet pipe is communicated with the liquid mixing box, and the other end is placed in an empty state;

wherein the adding pump is used for communicating the strontium carrier solution reagent bottle, the sodium hydroxide solution reagent bottle, the hydrochloric acid solution reagent bottle and the acetic acid-ammonium acetate solution reagent bottle to the liquid mixing box through pipelines;

wherein the online pH value measuring instrument is communicated with the liquid mixing tank through a combination pump and a pipeline and forms a circulation loop;

wherein the liquid mixing box is communicated with the ion exchange resin column through a combined pump and a pipeline;

wherein the strontium desorption solution reagent bottle is communicated with the ion exchange resin column through a combined pump and a pipeline;

wherein the regeneration pump is used for communicating a hydrochloric acid solution reagent bottle, a high-purity water bottle and a sodium chloride solution reagent bottle to the ion exchange resin column through pipelines;

wherein the ion exchange resin column is communicated with the strontium concentrated solution reagent bottle and the waste liquid pool through pipelines;

wherein the liquid mixing box, the on-line pH value measuring instrument, the adding pump, the combined pump and the regeneration pump are respectively and electrically connected with the controller.

A further technical scheme is, mix the liquid case and still include agitator motor, agitator, water level detector, inlet and liquid outlet, agitator and water level detector are set up at mixing the liquid incasement, are provided with agitator motor at mixing the liquid incasement portion, agitator motor and agitator fixed connection, the inlet is seted up at mixing the liquid roof portion, and the liquid outlet is seted up at mixing the liquid bottom of the case portion, agitator motor, water level detector are connected with the controller electricity respectively.

The technical scheme is that the sampling pipe is further provided with a filter, a first electromagnetic valve and a stop valve, one end of the sampling pipe is communicated with the liquid inlet of the liquid mixing box, the stop valve, the first electromagnetic valve and the filter are sequentially connected in series from the liquid inlet to the air direction, and the first electromagnetic valve is electrically connected with the controller.

The on-line pH measuring instrument comprises a solution flow cell and a measuring meter, wherein the measuring meter is arranged in the solution flow cell, the solution flow cell is respectively communicated with a liquid inlet of the liquid mixing box and the combined pump through pipelines, and the measuring meter is electrically connected with the controller.

The technical scheme is that the ion exchange resin column comprises a multi-position multi-way selector valve, a fifth electromagnetic valve and a sixth electromagnetic valve, wherein an inlet and an outlet are formed in the ion exchange resin column, the multi-position multi-way selector valve is communicated with the inlet through a pipeline, the outlet is communicated with a strontium concentrated solution reagent bottle and a waste liquid pool through pipelines respectively, the fifth electromagnetic valve is connected in series on the pipeline communicated with the strontium concentrated solution reagent bottle, the sixth electromagnetic valve is connected in series on the pipeline between the outlet and the waste liquid pool, and the multi-position multi-way selector valve, the fifth electromagnetic valve and the sixth electromagnetic valve are electrically connected with a controller.

The further technical proposal is that the device also comprises a first three-way joint, a second three-way joint, a first plunger pump, a second plunger pump and a second electromagnetic valve,

wherein the adding pump is a multi-channel peristaltic pump and at least comprises four independent channels of strontium carrier solution, acetic acid-ammonium acetate solution, hydrochloric acid solution and sodium hydroxide solution, the inlet of each independent channel of the corresponding adding pump is respectively and correspondingly connected with a strontium carrier solution reagent bottle, an acetic acid-ammonium acetate solution reagent bottle, a hydrochloric acid solution reagent bottle and a sodium hydroxide solution reagent bottle according to names through pipelines,

wherein the strontium carrier solution channel of the adding pump is connected with the first plunger pump and the waste liquid pool through a first three-way joint and a pipeline, a second electromagnetic valve is connected in series on the channel between the first three-way joint and the waste liquid pool, the first plunger pump is communicated with the liquid inlet through a pipeline,

wherein the acetic acid-ammonium acetate solution channel of the adding pump is connected with the second plunger pump and the second electromagnetic valve through a second three-way joint and a pipeline, the second plunger pump is communicated with the liquid inlet through a pipeline,

wherein the hydrochloric acid solution channel and the sodium hydroxide solution channel of the adding pump are respectively connected with the liquid inlet through pipelines,

wherein the first plunger pump, the second plunger pump and the second solenoid valve are electrically connected with the controller.

The further technical proposal is that the device also comprises a three-way joint, a third electromagnetic valve and a fourth electromagnetic valve,

wherein the combined pump is a multi-channel peristaltic pump and at least comprises two independent channels of a sample solution and a strontium desorption solution, the inlet of the sample solution channel is communicated with the liquid outlet of the liquid mixing box through a pipeline, the inlet of the strontium desorption solution channel is communicated with the strontium desorption solution reagent bottle through a pipeline,

wherein the outlet of the sample solution channel of the combined pump is respectively connected with the solution flow cell and the multi-position multi-way selector valve through a third three-way joint and a pipeline, a third electromagnetic valve is connected in series on the pipeline between the third three-way joint and the solution flow cell, a fourth electromagnetic valve is connected in series on the pipeline between the third three-way joint and the multi-position multi-way selector valve,

the third electromagnetic valve and the fourth electromagnetic valve are electrically connected with the controller.

The technical scheme is that the regeneration pump is a multi-channel peristaltic pump and at least comprises three independent channels of hydrochloric acid solution, high-purity water and sodium chloride solution, and inlets of the independent channels of the corresponding regeneration pump are correspondingly connected with a hydrochloric acid solution reagent bottle, a sodium chloride solution reagent bottle and a high-purity water bottle according to names respectively through pipelines.

The further technical proposal is that the multi-position and multi-way selector valve comprises a sample solution channel, a strontium desorption solution channel, a hydrochloric acid solution channel, a sodium chloride solution channel and a high-purity water channel,

wherein the sample solution channel inlet of the multi-position multi-way selection valve is communicated with the sample solution channel outlet of the combination pump through a pipeline,

wherein the strontium desorption liquid channel inlet of the multi-position multi-way selector valve is communicated with the strontium desorption liquid channel outlet of the combined pump through a pipeline,

wherein the hydrochloric acid solution channel inlet of the multi-position multi-way selector valve is communicated with the hydrochloric acid solution channel outlet of the regeneration pump through a pipeline,

wherein the sodium chloride solution channel inlet of the multi-position multi-way selector valve is communicated with the sodium chloride solution channel outlet of the regenerative pump through a pipeline,

wherein the high-purity water channel inlet of the multi-position multi-way selector valve is communicated with the high-purity water channel outlet of the regeneration pump through a pipeline,

wherein the outlet of each channel of the multi-position multi-way selector valve is communicated with the inlet of the ion exchange resin column through a pipeline.

The utility model has the beneficial effects that:

1. when the specific activity of strontium-90 in the liquid sample is analyzed by adopting an ion exchange method in the radiochemical analysis method for strontium-90 in HJ 815-2016 water and biological sample ash, the system can be connected with a nuclear power plant liquid effluent sampling system, so that automatic sample introduction is realized, and the sampling and transportation of large-volume samples are avoided.

2. The automatic addition of chemical reagents into the sample solution and the adjustment of the pH value of the solution can be realized.

3. The sample solution automatically passes through the ion exchange resin column and the strontium-90 nuclide in the resin column is automatically desorbed.

4. Realizing automatic in-situ regeneration of the ion exchange resin.

5. The device realizes automation of the steps which need manual operation and take longer time and influence the accuracy of the analysis result, such as sample introduction, desorption, resin regeneration and the like, in the analysis method, and improves the stability and the accuracy of the analysis result.

6. The technical problem of how to accurately quantify each reagent in the process of manual operation to automatic operation is solved.

Drawings

Fig. 1 is a layout of the present invention.

In the figure, 1 filter, 2 first electromagnetic valve, 3 stop valve, 4 mixing box, 5 first waste liquid pool, 6 stirrer, 7 first liquid inlet, 8 water level detector, 9 stirring motor, 10 second liquid inlet, 11 liquid outlet, 12 second electromagnetic valve, 13 first plunger pump, 14 second plunger pump, 15 adding pump, 16 controller, 17 solution flow cell, 18 measuring meter, 19 combination pump, 20 third electromagnetic valve, 21 fourth electromagnetic valve, 22 regeneration pump, 23 multi-position multi-way selection valve, 24 ion exchange resin column, 25 fifth electromagnetic valve, 26 sixth electromagnetic valve, 27 second waste liquid pool, 28 strontium concentrated solution reagent bottle, 29 high purity water bottle, 30 sodium chloride solution reagent bottle, 31 strontium desorption solution reagent bottle, 32 strontium carrier solution reagent bottle, 33 hydrochloric acid solution reagent bottle, 34 acetic acid-ammonium solution reagent bottle, 35 sodium hydroxide solution reagent bottle, 36 # three-way joint, no. 37 three-way joint, No. 38 three-way joint, 39 advance the appearance pipe.

Detailed Description

In order to better understand the technical content of the utility model, specific embodiments are provided below, and the utility model is further described with reference to the accompanying drawings.

Referring to fig. 1, a pretreatment device suitable for separating strontium-90 by an ion exchange method comprises a mixing tank 4, a sample inlet pipe 39, an online pH value measuring instrument, an adding pump 15, a combined pump 19, a regenerative pump 22, an ion exchange resin column 24, a controller 16, a strontium concentrated solution reagent bottle 28, a high-purity water bottle 29, a sodium chloride solution reagent bottle 30, a strontium desorption solution reagent bottle 31, a sodium hydroxide solution reagent bottle 35, a hydrochloric acid solution reagent bottle 33, an acetic acid-ammonium acetate solution reagent bottle 34, a strontium carrier solution reagent bottle 32 and a waste liquid pool, wherein one end of the sample inlet pipe 39 is communicated with the mixing tank 4, and the other end is placed in an empty state. The addition pump 15 connects the strontium carrier solution reagent bottle 32, the sodium hydroxide solution reagent bottle 35, the hydrochloric acid solution reagent bottle 33, and the acetic acid-ammonium acetate solution reagent bottle 34 to the liquid mixing tank 4 through pipes. The on-line pH value measuring instrument is communicated with the liquid mixing tank 4 through a combination pump 19 and a pipeline, and forms a circulation loop. The liquid mixing tank 4 is communicated with the ion exchange resin column 24 through a combination pump 19 and a pipeline. The strontium desorption solution reagent bottle 31 is communicated with the ion exchange resin column 24 through the combined pump 19 and a pipeline. The regeneration pump 22 connects the hydrochloric acid solution reagent bottle 33, the high purity water bottle 29 and the sodium chloride solution reagent bottle 30 to the ion exchange resin column 24 through pipes. The ion exchange resin column 24 is connected by piping to a strontium concentrate reagent bottle 28 and a waste reservoir. The liquid mixing tank 4, the on-line pH value measuring instrument, the addition pump 15, the combination pump 19, and the regeneration pump 22 are electrically connected to the controller 16, respectively.

After a water sample to be detected enters the liquid mixing box 4 from the sample inlet pipe 39, the adding pump 15 immediately conveys a corresponding chemical reagent to the liquid mixing box 4, after the pH value is adjusted to be proper, the combined pump 19 conveys the sample solution to be detected to the ion exchange resin column 24 for adsorption, the adsorbed sample solution waste liquid can be conveyed to the second waste liquid pool 27, then the combined pump 19 conveys the desorption liquid to the ion exchange resin column 24 to complete elution and desorption, the desorbed strontium-90 concentrated liquid is discharged to the strontium concentrated liquid reagent bottle 28 for collection, finally the regeneration pump conveys the regeneration reagent to the ion exchange resin column 24 for ion exchange resin column 24 regeneration, and the regenerated waste liquid is discharged to the second waste liquid pool 27.

It is specific, be provided with agitator 6 and level detector 8 in the liquid mixing box 4, liquid mixing box 4 outside is provided with agitator motor 9, wherein agitator motor 9 is arranged in driving agitator 6 stirs the liquid in liquid mixing box 4, level detector 8 is used for monitoring the water level height and will triggers the signal transfer after to controller 16, be provided with first inlet 7 on liquid mixing box 4, second inlet 10 and liquid outlet 11, first inlet 7 through advancing appearance pipe 39 and the sampling pipeline interconnect who gains the water sample that awaits measuring, it has stop valve 3 to have concatenated in proper order in the direction of sampling pipeline from first inlet 7, first solenoid valve 2 and filter 1. Preferably, the first solenoid valve 2, the stirring motor 9 and the water level detector 8 are electrically connected to the controller 16.

Specifically, the online pH measuring instrument is used for measuring the pH value of liquid in the liquid mixing box 4 and comprises an organic glass solution flow cell 17 and a measuring meter 18, the organic glass solution flow cell 17 is used for temporarily storing sample solution, the measuring meter 18 is used for measuring the pH value of a sample entering the cell, and the solution flow cell 17 is connected to a second liquid inlet 10 of the liquid mixing box 4 through a plastic hose. Preferably, the meter 18 is electrically connected to the controller 16.

Specifically, the external material of the ion exchange resin column 24 is tubular organic transparent glass, the volume is 50mL, the two ends of the inlet and the outlet can be disassembled, the internal material is styrene type strong acid cation exchange resin, and the resin can be replaced. A multi-position multi-way selector valve 23 is provided at the inlet, communicating with the inlet through a plastic hose. The fifth electromagnetic valve 25 and the sixth electromagnetic valve 26 are arranged at the outlets, the outlets are respectively connected with the strontium concentrated solution reagent bottle 28 and the second waste liquid pool 27 through a three-way joint and a plastic hose, the fifth electromagnetic valve 25 is arranged on the hose between the three-way joint and the strontium concentrated solution reagent bottle 28, and the sixth electromagnetic valve 26 is arranged on the hose between the three-way joint and the second waste liquid pool 27. Preferably, the multi-position, multi-way selector valve 23, the fifth solenoid valve 25 and the sixth solenoid valve 26 are electrically connected to the controller 16.

Specifically, the addition pump 15 is a multi-channel peristaltic pump, the peristaltic pump can set flow and flow rate through the controller 16, and at least includes four independent channels of a strontium carrier solution, an acetic acid-ammonium acetate solution, a hydrochloric acid solution, and a sodium hydroxide solution, and inlets of the independent channels of the corresponding chemical reagent addition pump 15 are respectively connected with the strontium carrier solution reagent bottle 32, the acetic acid-ammonium acetate solution reagent bottle, the hydrochloric acid solution reagent bottle 33, and the sodium hydroxide solution reagent bottle 35 through plastic hoses.

Wherein, the strontium carrier solution channel of adding pump 15 is connected first plunger pump 13 and first waste liquid pond 5 through three way connection 36 and plastic hose, is equipped with second solenoid valve 12 on the plastic hose between three way connection 36 and first waste liquid pond 5, and first plunger pump 13 can directly pour into strontium carrier solution into second inlet 10.

Wherein, the acetic acid-ammonium acetate solution channel of the adding pump 15 is connected with the second plunger pump 14 and the second electromagnetic valve 12 through a second tee joint and a plastic hose, and the second plunger pump 14 can directly inject the acetic acid-ammonium acetate solution into the second liquid inlet 10.

Wherein, the hydrochloric acid solution channel and the sodium hydroxide solution channel of the adding pump 15 are respectively connected with the second liquid inlet 10 through plastic hoses.

Preferably, the addition pump 15, the first plunger pump 13, the second plunger pump 14, and the second solenoid valve 12 are electrically connected to the controller 16.

Specifically, the combination pump 19 is a multi-channel peristaltic pump, and can set the flow rate and the flow rate through the controller 16, and at least comprises two independent channels of the sample solution and the strontium desorption solution. The inlet of the sample solution channel is connected with the liquid outlet 11 of the liquid mixing box 4 through a plastic hose, and the inlet of the strontium desorption solution channel is connected with the strontium desorption solution reagent bottle 31 through a plastic hose.

Wherein, the outlet of the sample solution channel of the combination pump 19 is respectively connected with the on-line pH measuring instrument and the multi-position multi-way selector valve 23 through a third three-way joint 38 and a plastic hose, a third electromagnetic valve 20 is arranged on the hose between the third three-way joint 38 and the on-line pH measuring instrument, and a fourth electromagnetic valve 21 is arranged on the hose between the third three-way joint 38 and the multi-position multi-way selector valve 23.

Preferably, the combination pump 19, the third solenoid valve 20 and the fourth solenoid valve 21 are electrically connected to the controller 16.

Specifically, the regeneration pump 22 is a multi-channel peristaltic pump, and may set a flow rate and a flow velocity by the controller 16, and at least includes three independent channels of a hydrochloric acid solution, high purity water, and a sodium chloride solution, and inlets of the respective independent channels of the corresponding regeneration pump 22 are respectively connected to the hydrochloric acid solution reagent bottle 33, the sodium chloride solution reagent bottle 30, and the high purity water bottle 29 by plastic hoses. Preferably, the regeneration pump 22 is electrically connected to the controller 16.

Specifically, the multi-position multi-way selector valve 23 includes at least five liquid inlet channels, and the five liquid inlet channels are respectively used for introducing a sample solution, a strontium desorption solution, a hydrochloric acid solution, a sodium chloride solution and high purity water. Channel switch switching may be controlled by controller 16. The inlet of the sample solution channel is connected with the outlet of the sample solution channel of the combined pump 19, the inlet of the strontium desorption liquid channel is connected with the outlet of the strontium desorption liquid channel of the combined pump 19 through a plastic hose, the inlet of the hydrochloric acid solution channel is connected with the outlet of the hydrochloric acid solution channel of the regeneration pump 22 through a plastic hose, the inlet of the sodium chloride solution channel is connected with the outlet of the sodium chloride solution channel of the regeneration pump 22 through a plastic hose, the inlet of the high-purity water channel is connected with the outlet of the high-purity water channel of the regeneration pump 22 through a plastic hose, and the liquid outlet 11 of each channel is connected with the inlet of the ion exchange resin column 24 through a plastic hose.

Specifically, the multi-channel peristaltic pump can be a peristaltic pump with the model of Lange BT100-1L, and has the functions of flow detection, quantitative and fixed speed setting and analog quantity communication.

Specifically, the plunger pump may be selected from the group consisting of the automatic potentiometric titrators available under the model METTLER TOLEDO T90.

The working principle of the utility model is as follows:

the liquid effluent of the nuclear power plant is stored in a tank, and a strontium-90 pretreatment device is connected with sampling pipelines of various liquid storage tanks through plastic hoses. When the device works, the manual stop valve 3 of the device is in an open state, the controller 16 sets that the first electromagnetic valve 2 is opened at intervals to fill the sample solution into the liquid mixing box 4, and the sample solution is filtered by the filter 1 to remove particle impurities. When the water level detector 8 monitors that the sample solution in the liquid mixing tank 4 reaches a set liquid level, the water level detector 8 inputs a signal to the controller 16, the controller 16 closes the first electromagnetic valve 2, liquid feeding is stopped, and the stirring motor 9 is started to drive the stirrer 6 to stir.

The controller 16 then sends a signal to open the second solenoid valve 12, and opens the corresponding channel of the strontium carrier solution in the addition pump 15, so that the strontium carrier solution is discharged into the first waste liquid tank 5, thereby removing bubbles in the pipeline, and the discharge capacity can be set in the controller 16 according to the length of the pipeline. After the exhaust is finished, the second electromagnetic valve 12 is closed, the first plunger pump 13 is opened, and the strontium carrier solution is added into the liquid mixing box 4, wherein the addition amount of the strontium carrier solution can be set in the controller 16. After the strontium carrier solution is added, the first plunger pump 13 is closed, and the strontium carrier solution passage in the adding pump 15 is closed, preferably, the adding amount of the strontium carrier solution is 2.00mL, and the strontium carrier solution can be accurately added by the characteristics of the first plunger pump 13.

Then the controller 16 opens the second electromagnetic valve 12, opens the corresponding channel of the acetic acid-ammonium acetate solution in the addition pump 15, so that the acetic acid-ammonium acetate solution is discharged into the first waste liquid tank 5, bubbles in the pipeline are removed, and the discharge amount can be set in the controller 16 according to the length of the pipeline. After the air-out is completed, the second electromagnetic valve 12 is closed, the second plunger pump 14 is opened, and the acetic acid-ammonium acetate solution is added into the liquid mixture tank 4, and the addition amount of the acetic acid-ammonium acetate solution can be set in the controller 16. After the addition of the acetic acid-ammonium acetate is completed, the second plunger pump 14 is closed, and the passage of the acetic acid-ammonium acetate solution in the addition pump 15 is closed, and preferably, the addition amount of the acetic acid-ammonium acetate solution is 20.00mL, and the precise addition can be performed by the characteristics of the second plunger pump 14.

And then the controller 16 controls to open the third electromagnetic valve 20, close the fourth electromagnetic valve 21, open the online pH measuring instrument, open the sample solution channel of the combination pump 19, transport the sample solution in the liquid mixing box 4 to the organic glass solution flow cell 17 of the online pH measuring instrument, and measure the pH value of the solution in the liquid mixing box 4. The pH target value of the solution in the liquid mixing box 4 set in the controller 16 is 4.5-5.0, when the online pH measuring instrument measures that the solution in the liquid mixing box 4 deviates from the interval, a hydrochloric acid solution or sodium hydroxide solution channel in a channel of the corresponding adding pump 15 is opened, the hydrochloric acid solution or the sodium hydroxide solution is added, and the solution in the liquid mixing box 4 is adjusted to be within the target pH interval value. After the pH value is adjusted, the controller 16 sequentially turns off the addition pump 15, turns off the combination pump 19, turns off the third electromagnetic valve 20, and turns off the online pH measuring instrument.

Then the controller 16 controls to open the sixth electromagnetic valve 26, close the fifth electromagnetic valve 25, open the sample solution channel in the multi-position multi-way selector valve 23, open the fourth electromagnetic valve 21, open the sample solution channel of the combination pump 19, so that the sample solution flows into the second waste liquid pool 27 after passing through the ion exchange resin column 24. The total sample volume and sample rate of the solution can be set in the controller 16, with an optimal value of 20 mL/min. After the sample solution in the liquid mixing tank 4 is completely evacuated, the controller 16 sequentially controls to close the sample solution channel of the combination pump 19 and close the sixth electromagnetic valve 26.

Then the controller 16 controls to open the fifth electromagnetic valve 25, open the strontium desorption liquid sample inlet channel in the multi-position multi-way selector valve 23, and open the strontium desorption liquid sample inlet channel of the combination pump 19, so that the strontium desorption liquid passes through the ion exchange resin column 24. The total sample introduction amount and the sample introduction speed of the strontium desorption liquid can be set in the controller 16, the optimal value is the sample introduction speed of 4-5 mL/min, and the total sample introduction amount is 200 mL. After the strontium desorption liquid reaches the set total sample injection amount, the controller 16 controls to close the strontium desorption liquid sample injection channel of the combination pump 19, close the fourth electromagnetic valve 21, close the desorption liquid sample injection channel in the multi-position multi-way selector valve 23 and close the fifth electromagnetic valve 25 in sequence.

At this point, the separation of strontium-90 from the sample solution is completed.

Regeneration of the ion exchange resin column 24:

the controller 16 controls to open the sixth electromagnetic valve 26, open the high-purity water sampling channel in the multi-position multi-way selector valve 23, and open the high-purity water channel of the regeneration pump 22, wherein the total sampling volume and the sampling speed of the high-purity water can be set in the controller 16, the optimal value is the sampling speed of 3mL/min, and the total sampling volume is 100 mL.

After the high-purity water reaches the set total amount, the controller 16 sequentially controls to close the high-purity water sample injection channel in the multi-position multi-way selector valve 23, close the high-purity water channel of the regeneration pump 22, open the hydrochloric acid solution sample injection channel in the multi-position multi-way selector valve 23, and open the hydrochloric acid solution channel of the regeneration pump 22, wherein the total sample injection amount and the sample injection speed of the hydrochloric acid solution can be set in the controller 16, the optimal value is the sample injection speed of 3mL/min, and the total sample injection amount is 200 mL.

After the sample injection amount of the hydrochloric acid solution reaches the set total amount, the controller 16 sequentially controls to close the hydrochloric acid solution sample injection channel in the multi-position multi-way selector valve 23, close the hydrochloric acid solution channel of the regeneration pump 22, open the high-purity water sample injection channel in the multi-position multi-way selector valve 23 and open the high-purity water channel of the regeneration pump 22, wherein the total sample injection amount and the sample injection speed of the high-purity water can be set in the controller 16, the optimal value is the sample injection speed of 3mL/min, and the total sample injection amount is 200 mL.

After the sample introduction amount of the high-purity water reaches the set total amount, the controller 16 sequentially controls to close the high-purity water sample introduction channel in the multi-position multi-way selector valve 23, close the high-purity water channel of the regeneration pump 22, open the sodium chloride sample introduction channel in the multi-position multi-way selector valve 23 and open the sodium chloride channel of the regeneration pump 22, wherein the total sample introduction amount and the sample introduction speed of the sodium chloride can be set in the controller 16, the optimal value is the sample introduction speed of 3mL/min, and the total sample introduction amount is 200 mL.

After the sample introduction amount of the sodium chloride reaches the set total amount, the controller 16 sequentially controls to close a sodium chloride sample introduction channel in the multi-position multi-way selector valve 23, close a sodium chloride channel of the regeneration pump 22, open a high-purity water sample introduction channel in the multi-position multi-way selector valve 23 and open a high-purity water channel of the regeneration pump 22, wherein the total sample introduction amount and the sample introduction speed of the high-purity water can be set in the controller 16, the optimal value is the sample introduction speed of 3mL/min, and the total sample introduction amount is 200 mL.

After the high purity water sample introduction amount reaches the set total amount, the controller 16 sequentially controls to close the high purity water sample introduction channel of the multi-position multi-way selector valve 23, close the high purity water channel of the regeneration pump 22, and close the sixth electromagnetic valve 26. This completes the regeneration of the ion exchange resin column 24.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (9)

1. The utility model provides a preceding processing apparatus suitable for ion exchange method separation strontium-90, including mixing liquid case (4), sample tube (39), online pH value measuring apparatu, add pump (15), combination pump (19), regenerative pump (22), ion exchange resin post (24), controller (16), strontium concentrate reagent bottle (28), high-purity water bottle (29), sodium chloride solution reagent bottle (30), strontium desorption liquid reagent bottle (31), sodium hydroxide solution reagent bottle (35), hydrochloric acid solution reagent bottle (33), acetic acid-ammonium acetate solution reagent bottle (34), strontium carrier solution reagent bottle (32) and waste liquid pond, its characterized in that:

one end of the sample inlet pipe (39) is communicated with the liquid mixing box (4), and the other end of the sample inlet pipe is arranged in an opposite air;

the adding pump (15) is used for communicating a strontium carrier solution reagent bottle (32), a sodium hydroxide solution reagent bottle (35), a hydrochloric acid solution reagent bottle (33) and an acetic acid-ammonium acetate solution reagent bottle (34) to the liquid mixing box (4) through pipelines;

the online pH value measuring instrument is communicated with the liquid mixing box (4) through a combination pump (19) and a pipeline to form a circulation loop;

the liquid mixing tank (4) is communicated with the ion exchange resin column (24) through a combined pump (19) and a pipeline;

the strontium desorption liquid reagent bottle (31) is communicated with the ion exchange resin column (24) through a combined pump (19) and a pipeline;

the regeneration pump (22) is used for communicating a hydrochloric acid solution reagent bottle (33), a high-purity water bottle (29) and a sodium chloride solution reagent bottle (30) to the ion exchange resin column (24) through pipelines;

the ion exchange resin column (24) is communicated with a strontium concentrated solution reagent bottle (28) and a waste liquid pool through a pipeline;

the liquid mixing tank (4), the online pH value measuring instrument, the adding pump (15), the combined pump (19) and the regeneration pump (22) are respectively and electrically connected with the controller (16).

2. The pretreatment device for separating strontium-90 by ion exchange method according to claim 1, wherein: mix liquid case (4) and still include agitator motor (9), agitator (6), water level detector (8), inlet and liquid outlet (11), agitator (6) and water level detector (8) are set up in mixing liquid case (4), are provided with agitator motor (9) in mixing liquid case (4) outside, agitator motor (9) and agitator (6) fixed connection, the inlet is seted up at mixing liquid case (4) top, and liquid outlet (11) are seted up in mixing liquid case (4) bottom, agitator motor (9), water level detector (8) are connected with controller (16) electricity respectively.

3. The pretreatment device for separating strontium-90 by ion exchange method according to claim 2, wherein: still include filter (1), first solenoid valve (2) and stop valve (3) on sample inlet pipe (39), sample inlet pipe (39) one end intercommunication mixes the inlet of liquid case (4), has concatenated stop valve (3), first solenoid valve (2) and filter (1) in proper order to empty orientation from the inlet, first solenoid valve (2) are connected with controller (16) electricity.

4. The pretreatment device for separating strontium-90 by ion exchange method according to claim 3, wherein: the on-line pH value measuring instrument comprises a solution flow cell (17) and a measuring meter (18), wherein the measuring meter (18) is arranged in the solution flow cell (17), the solution flow cell (17) is respectively communicated with a liquid inlet of the liquid mixing box (4) and the combined pump (19) through pipelines, and the measuring meter (18) is electrically connected with the controller (16).

5. The pretreatment device for separating strontium-90 by ion exchange method according to claim 4, wherein: still include many-way selector valve (23), fifth solenoid valve (25) and sixth solenoid valve (26) of multiposition, be equipped with entry and export on ion exchange resin post (24), many-way selector valve (23) of multiposition are through pipeline and entry intercommunication, and the export communicates strontium concentrate reagent bottle (28) and waste liquid pond respectively through the pipeline, concatenates fifth solenoid valve (25) on the pipeline of export and strontium concentrate reagent bottle (28) intercommunication, concatenates sixth solenoid valve (26) on the pipeline between export and the waste liquid pond, many-way selector valve (23), fifth solenoid valve (25) and sixth solenoid valve (26) of multiposition are connected with controller (16) electricity.

6. The pretreatment device for separating strontium-90 by ion exchange method according to claim 5, wherein: the hydraulic pump further comprises a first three-way joint (36), a second three-way joint (37), a first plunger pump (13), a second plunger pump (14) and a second electromagnetic valve (12);

the adding pump (15) is a multi-channel peristaltic pump and at least comprises four independent channels of strontium carrier solution, acetic acid-ammonium acetate solution, hydrochloric acid solution and sodium hydroxide solution, and inlets of the independent channels of the corresponding adding pump (15) are correspondingly and one-to-one connected with a strontium carrier solution reagent bottle (32), an acetic acid-ammonium acetate solution reagent bottle, a hydrochloric acid solution reagent bottle (33) and a sodium hydroxide solution reagent bottle (35) through pipelines;

a strontium carrier solution channel of the adding pump (15) is connected with a first plunger pump (13) and a waste liquid pool through a first three-way joint (36) and a pipeline, a second electromagnetic valve (12) is connected in series on a channel between the first three-way joint (36) and the waste liquid pool, and the first plunger pump (13) is communicated with a liquid inlet through a pipeline;

the acetic acid-ammonium acetate solution channel of the adding pump (15) is connected with a second plunger pump (14) and a second electromagnetic valve (12) through a second three-way joint (37) and a pipeline, and the second plunger pump (14) is communicated with the liquid inlet through the pipeline;

the hydrochloric acid solution channel and the sodium hydroxide solution channel of the addition pump (15) are respectively connected with the liquid inlet through pipelines;

the first plunger pump (13), the second plunger pump (14) and the second electromagnetic valve (12) are electrically connected with a controller (16).

7. The pretreatment device for separating strontium-90 by ion exchange method according to claim 6, wherein: the three-way valve also comprises a third three-way joint (38), a third electromagnetic valve (20) and a fourth electromagnetic valve (21);

the combined pump (19) is a multi-channel peristaltic pump and at least comprises two independent channels of a sample solution and a strontium desorption solution, the inlet of the sample solution channel is communicated with the liquid outlet (11) of the liquid mixing tank (4) through a pipeline, and the inlet of the strontium desorption solution channel is communicated with the strontium desorption solution reagent bottle (31) through a pipeline;

the outlet of a sample solution channel of the combined pump (19) is respectively connected with the solution flow cell (17) and the multi-position multi-way selector valve (23) through a third three-way joint (38) and a pipeline, a third electromagnetic valve (20) is connected in series on the pipeline between the third three-way joint (38) and the solution flow cell (17), and a fourth electromagnetic valve (21) is connected in series on the pipeline between the third three-way joint (38) and the multi-position multi-way selector valve (23);

the third electromagnetic valve (20) and the fourth electromagnetic valve (21) are electrically connected with the controller (16).

8. The pretreatment device for separating strontium-90 by ion exchange according to claim 7, wherein: the regeneration pump (22) is a multi-channel peristaltic pump and at least comprises three independent channels of hydrochloric acid solution, high-purity water and sodium chloride solution, and inlets of the independent channels of the corresponding regeneration pump (22) are correspondingly and one-to-one connected with a hydrochloric acid solution reagent bottle (33), a sodium chloride solution reagent bottle (30) and a high-purity water bottle (29) through pipelines.

9. The pretreatment apparatus of claim 8, wherein the pretreatment apparatus comprises: the multi-position multi-way selector valve (23) comprises a sample solution channel, a strontium desorption solution channel, a hydrochloric acid solution channel, a sodium chloride solution channel and a high-purity water channel;

the inlet of a sample solution channel of the multi-position multi-way selector valve (23) is communicated with the outlet of a sample solution channel of the combined pump (19) through a pipeline;

the strontium desorption liquid channel inlet of the multi-position multi-way selector valve (23) is communicated with the strontium desorption liquid channel outlet of the combined pump (19) through a pipeline;

the hydrochloric acid solution channel inlet of the multi-position multi-way selector valve (23) is communicated with the hydrochloric acid solution channel outlet of the regeneration pump (22) through a pipeline;

the sodium chloride solution channel inlet of the multi-position multi-way selector valve (23) is communicated with the sodium chloride solution channel outlet of the regeneration pump (22) through a pipeline;

the high-purity water channel inlet of the multi-position multi-way selector valve (23) is communicated with the high-purity water channel outlet of the regeneration pump (22) through a pipeline;

the outlet of each channel of the multi-position multi-way selector valve (23) is communicated with the inlet of an ion exchange resin column (24) through a pipeline.

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