Preparation method and application of barium strontium sulfate scale remover

Abstract

The invention relates to a preparation method of a barium strontium sulfate scale remover, which comprises the following steps: adding a prepared additive solution into a prepared chelating agent alkaline solution, fully mixing and dissolving, and adjusting the pH value to be alkaline to obtain the barium strontium sulfate scale remover. Compared with the prior art, the preparation method has the following beneficial effects that the damage effect of the descaling agent on barium strontium sulfate scale can be remarkably improved, the contact area with metal ions is increased, so that the overall descaling effect is improved, formation of the barium strontium sulfate scale is effectively damaged, the descaling agent still keeps a stable descaling effect in a high-temperature environment, and the service life of the descaling agent is prolonged. The method has a wide industrial application prospect. The used chelating agent not only has a good metal ion chelation effect, can effectively complex ions such as barium and strontium and destroy generation of barium sulfate and strontium sulfate crystals, but also has the characteristics of being still stable at high temperature and high pH value, suitable for complex industrial conditions, excellent in performance in neutral and alkaline water and the like, and is more environmentally friendly.

Description

Technical Field

[0001] The invention relates to the technical field of industrial water treatment, and in particular to a preparation method and application of a barium strontium sulfate descaling agent. Background Art

[0002] In the process of industrial water treatment, the formation and deposition of barium strontium sulfate scale is a common and difficult problem to solve. Especially in high temperature, high pressure or high mineralization environments such as oil and gas extraction, power generation, chemical manufacturing and seawater desalination, barium strontium sulfate scale can cause pipe and equipment blockage, significantly reduce heat transfer efficiency and system operation stability, and may even cause equipment failure.

[0003] There are few types of descaling agents for barium strontium sulfate scale on the market, and the effects vary greatly. While many products can effectively dissolve barium strontium sulfate scale, they often corrode the equipment, or the descaling effect is not long-lasting due to insufficient chemical stability; some descaling agents are not environmentally friendly and are prone to secondary pollution. In addition, among the traditional descaling methods, mechanical removal and acid cleaning have defects such as complex operation, corrosion equipment and high processing costs, which are difficult to meet the needs of modern industry for efficient, safe and economical cleaning technology.

[0004] Therefore, in order to solve one of the above problems, a barium strontium sulfate descaling agent is needed, which can quickly and efficiently dissolve barium strontium sulfate scale and has equipment compatibility, environmental protection and economy. Summary of the invention

[0005] In view of the above deficiencies in the prior art, the technical problem to be solved by the present invention is: to provide a preparation method of a barium strontium sulfate descaling agent and its application, to prepare an efficient, safe and environmentally friendly barium strontium sulfate descaling agent, to solve the problems of poor descaling effect of existing descaling agents and complex operation of descaling methods, and to effectively destroy the formation of barium strontium sulfate scale, improve descaling efficiency, and reduce the maintenance cost of industrial equipment, thereby meeting the needs of modern industry for efficient, safe and economical cleaning technology.

[0006] The preparation method of a barium strontium sulfate descaling agent described in the present invention prepares a novel barium strontium sulfate descaling agent by introducing compounds such as graphene oxide, a chelating agent and additives, thereby effectively solving the deposition problem of barium strontium sulfate scale.

[0007] The preparation method of a barium strontium sulfate descaling agent disclosed by the present invention comprises the following steps: adding a prepared additive solution into a prepared chelating agent alkaline solution, fully mixing and dissolving, and adjusting the pH to alkaline, so as to obtain the barium strontium sulfate descaling agent, wherein the additive solution is one of GT (graphene oxide and triethylenetetramine compound solution), TETA (triethylenetetramine), GD (graphene oxide and diethylenetriamine compound solution), DETA (diethylenetriamine), GC (graphene oxide and citric acid compound solution), citric acid solution, GTA (graphene oxide and tartaric acid compound solution), and tartaric acid solution.

[0008] Preferably, the mass fraction of the chelating agent in the chelating agent solution is 5% to 15%, and the mass fraction of the additive in the additive solution is 1% to 5%.

[0009] Preferably, the preparation steps of the chelating agent alkaline solution are:

[0010] (1) Weigh the required chelating agent in proportion into a beaker or volumetric flask, add an appropriate amount of deionized water, and place the beaker or volumetric flask containing the solution on a magnetic stirrer for stirring;

[0011] (2) Adjust the pH to 8 by adding an appropriate amount of pH regulator and continue stirring for 30 to 60 minutes until the chelating agent is completely dissolved.

[0012] Preferably, the chelating agent is one of DTPA-BMA (5,8-dicarboxymethyl-11-[2-(methylamino)-2-oxoethyl]-3-oxo-2,5,8,11-tetraazatridecyl-13-carboxylic acid), EDDHMA (N,N'-bis(2-hydroxy-5-methylphenyl)ethylenediamine-N,N'-diacetic acid), DTPA (pentasodium ethylenediaminetetraacetate), and HEDP (hydroxyethylidene diphosphonic acid).

[0013] Preferably, the additive solution is a composite solution of graphene oxide and triethylenetetramine, and its preparation steps are: GO (graphene oxide) and TETA (triethylenetetramine) are uniformly mixed in a 1:1 ratio, the required mixture is weighed in proportion, an appropriate amount of deionized water is added, and stirred on a magnetic stirrer for 30 to 45 minutes until it is completely dissolved.

[0014] Preferably, the additive solution is a composite solution of graphene oxide and diethylenetriamine, and its preparation steps are: GO (graphene oxide) and DETA (diethylenetriamine) are uniformly mixed in a 1:1 ratio, the required mixture is weighed in proportion, an appropriate amount of deionized water is added, and the mixture is stirred on a magnetic stirrer for 30 to 45 minutes until it is completely dissolved.

[0015] Preferably, the additive solution is a composite solution of graphene oxide and citric acid, and its preparation steps are: GO (graphene oxide) and citric acid are uniformly mixed in a 1:1 ratio, the required mixture is weighed in proportion, an appropriate amount of deionized water is added, and the mixture is stirred on a magnetic stirrer for 30 to 45 minutes until it is completely dissolved.

[0016] Preferably, the chelating agent alkaline solution is mixed with the additive solution, placed in a magnetic stirrer to fully dissolve for 30 to 60 minutes, and a pH regulator is added to adjust the pH to 12, and finally a barium strontium sulfate descaling agent is obtained.

[0017] Preferably, the pH regulator used in the preparation of the chelating agent alkaline solution and the preparation of the barium strontium sulfate descaling agent is one of NaOH, KOH, Na2CO3, and NH3·H20.

[0018] The application of the barium strontium sulfate descaling agent obtained by the preparation method of the barium strontium sulfate descaling agent of the present invention is specifically as follows: first, a barium strontium sulfate scale sample and water weighed in advance are added to an experimental container; then, a prepared descaling agent solution is added to the experimental container, wherein the mass fraction of the descaling agent in the descaling agent solution is 5% to 15%; then, the experimental container is placed in a constant temperature water bath, the temperature is set to 80°C, and a descaling experiment is performed, and the scale sample is weighed and recorded at intervals of 5h, 8h, and 16h, respectively, and after the barium strontium sulfate scale is completely dissolved, its final reaction time is recorded, and after the reaction is completed, the barium strontium sulfate scale sample is filtered and weighed, and its descaling rate is calculated.

[0019] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0020] (1) The preparation method of the present invention can significantly improve the descaling effect of the descaling agent on barium strontium sulfate scale. The combination of the chelating agent and the additive increases the contact area with the metal ions, thereby improving the overall descaling effect, and can effectively destroy the formation of barium strontium sulfate scale. In addition, the descaling agent can still maintain a stable descaling effect under high temperature environment, and has broad industrial application prospects;

[0021] (2) The chelating agent used in the preparation method of the present invention not only has good metal ion chelating effect, can effectively complex barium, strontium and other ions, and destroy the formation of barium sulfate and strontium sulfate crystals, but also has the characteristics of being stable at high temperature and high pH value, suitable for complex industrial conditions, and performing well in neutral and alkaline water, and is more environmentally friendly;

[0022] (3) The preparation method of the present invention uses GO (graphene oxide) as a carrier. The surface of graphene oxide contains abundant functional groups such as carboxyl, hydroxyl and epoxy groups, and has excellent hydrophilicity and dispersibility. It can not only enhance the adsorption and complexation of chelating agents and additives on metal ions, but also improve the dissolution and descaling ability of barium sulfate and strontium sulfate crystals. In addition, as an environmentally friendly material, graphene oxide can not only effectively adsorb metal ions (such as barium, strontium, etc.), but also complex with metal ions through surface functional groups, and reduce the negative impact on the environment during chemical treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0024] (1) Figure 1 The following are SEM photos of two barium strontium sulfate scale samples selected in the experiment of Example 2-13 before and after the reaction; (a) and (b) are photos of flaky barium strontium sulfate scale before and 8 hours after the experiment, and (c) and (d) are photos of massive barium strontium sulfate scale before and 8 hours after the experiment;

[0025] (2) Figure 2 These are EDS photos of two barium strontium sulfate scale samples selected in the experiment of Example 2-13 before and after the reaction, where a is flaky barium strontium sulfate scale, and b is massive barium strontium sulfate scale;

[0026] (3) Figure 3 The dissolution curves of two types of barium strontium sulfate scale samples obtained in the descaling agent in the experiment of Example 2-13 within 8 hours, where a is a flaky barium strontium sulfate scale and b is a blocky barium strontium sulfate scale;

[0027] (4) Figure 4 The dissolution efficiency curve of the descaling agent obtained in the experiment of Example 2-13 in the blocky barium strontium sulfate scale sample; DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1: A method for preparing a chelating agent alkaline solution, taking the preparation of a DTPA-BMA alkaline solution as an example, comprises the following steps:

[0031] (1) Weigh 5% DTPA-BMA into a beaker or volumetric flask, add an appropriate amount of deionized water, and place the beaker or volumetric flask containing the solution on a magnetic stirrer for stirring;

[0032] (2) Adjust the pH to 8 by adding an appropriate amount of 5 mol / L NaOH solution, and continue the reaction for 30 to 60 minutes until DTPA-BMA is completely dissolved.

[0033] Example 2: A method for preparing a barium strontium sulfate descaling agent, taking the preparation of a TETA solution as an example, comprises the following steps:

[0034] (1) GO powder and TETA were uniformly mixed in a ratio of 1:1 and named GT. GT with a mass fraction of 3% and deionized water were added to a reaction bottle and placed on a magnetic stirrer for continuous stirring for 30 to 45 minutes until it was completely dissolved.

[0035] (2) The prepared GT solution was added to the DTPA-BMA alkaline solution in Example 1 at a ratio of 1:1, and the mixture was placed on a magnetic stirrer and stirred for 30 to 60 minutes. A 5 mol / L NaOH solution was added dropwise to adjust the pH to 12, and finally a barium strontium sulfate descaling agent was obtained. For easy identification, the descaling agent obtained in Example 2 was named DTPA-BMA-GT. Figure 3 , Figure 4 The curve described in DTPA-BMA-GT.

[0036] Example 3: A method for preparing a barium strontium sulfate descaling agent, which is different from Example 2 in that the additive is TETA without GO, and specifically comprises the following steps:

[0037] (1) Add 3% by mass of TETA and deionized water into a reaction bottle and place it on a magnetic stirrer and stir for 30 to 45 minutes until it is completely dissolved.

[0038] (2) The prepared TETA solution was added to the DTPA-BMA alkaline solution in Example 1 at a ratio of 1:1, and the mixture was placed on a magnetic stirrer and stirred for 30 to 60 minutes. A 5 mol / L NaOH solution was added dropwise to adjust the pH to 12, and finally a barium strontium sulfate descaling agent was obtained. For easy identification, the descaling agent obtained in Example 3 was named DTPA-BMA-TETA. Figure 3 , Figure 4 The curve described in DTPA-BMA-TETA.

[0039] Example 4: A method for preparing a barium strontium sulfate descaling agent, which is different from Example 2 in that the additives are different, and specifically comprises the following steps:

[0040] (1) GO powder and DETA were uniformly mixed in a ratio of 1:1 and named GD. GD with a mass fraction of 3% and deionized water were added to a reaction bottle and placed on a magnetic stirrer for continuous stirring for 30 min to 45 min until it was completely dissolved.

[0041] (2) Add the prepared GD solution to the DTPA-BMA alkaline solution in Example 1, place it on a magnetic stirrer and continue stirring for 30 to 60 minutes, add 5 mol / L NaOH solution to adjust the pH to 12, and finally obtain a barium strontium sulfate descaling agent. For easy distinction, the descaling agent obtained in Example 4 is named DTPA-BMA-GD. Figure 3 , Figure 4 The curve described in DTPA-BMA-GD.

[0042] Example 5: A method for preparing a barium strontium sulfate descaling agent, which is different from Example 4 in that the additive is DETA without GO added, and specifically comprises the following steps:

[0043] (1) Add 3% DETA and deionized water into a reaction bottle and place it on a magnetic stirrer for 30 to 45 minutes to completely dissolve.

[0044] (2) Add the prepared DETA solution to the DTPA-BMA alkaline solution in Example 1, place on a magnetic stirrer and continue stirring for 30 to 60 minutes, add 5 mol / L NaOH solution dropwise to adjust the pH to 12, and finally obtain a barium strontium sulfate descaling agent. For easy distinction, the descaling agent obtained in Example 5 is named DTPA-BMA-DETA. Figure 3 , Figure 4 The curve described in DTPA-BMA-DETA.

[0045] Example 6: A method for preparing a barium strontium sulfate descaling agent, which is different from Example 4 in that the additive is GC, and specifically comprises the following steps:

[0046] (1) GO powder and citric acid were uniformly mixed in a ratio of 1:1 and named GC. 3% GC and deionized water were added to a reaction bottle and placed on a magnetic stirrer for continuous stirring for 30 to 45 minutes until it was completely dissolved.

[0047] (2) The prepared GC solution was added to the DTPA-BMA alkaline solution in Example 1 at a ratio of 1:1, and the mixture was placed on a magnetic stirrer and stirred for 30 to 60 minutes. A 5 mol / L NaOH solution was added dropwise to adjust the pH to 12, and finally a barium strontium sulfate descaling agent was obtained. For easy identification, the descaling agent obtained in Example 6 was named DTPA-BMA-GC. Figure 3 , Figure 4 The curve described in DTPA-BMA-GC.

[0048] Example 7: A method for preparing a barium strontium sulfate descaling agent, which is different from Example 6 in that the additive is citric acid without GO added, and specifically comprises the following steps:

[0049] (1) Add 3% citric acid and deionized water into a reaction bottle and place it on a magnetic stirrer and stir for 30 to 45 minutes until it is completely dissolved.

[0050] (2) The prepared citric acid solution was added to the DTPA-BMA alkaline solution in Example 1 at a ratio of 1:1, and the mixture was placed on a magnetic stirrer and stirred for 30 to 60 minutes. A 5 mol / L NaOH solution was added dropwise to adjust the pH to 12, and finally a barium strontium sulfate descaling agent was obtained. For easy identification, the descaling agent obtained in Example 7 was named DTPA-BMA-citric acid. Figure 3 , Figure 4 The curve described in DTPA-BMA-citrate.

[0051] Example 8: A method for preparing a barium strontium sulfate descaling agent, which is different from Example 6 in that the additive is GTA, and specifically comprises the following steps:

[0052] (1) GO powder and tartaric acid were uniformly mixed in a ratio of 1:1, named GTA, and 3% GTA and deionized water were added to a reaction bottle, and placed on a magnetic stirrer and stirred for 30 to 45 minutes until it was completely dissolved.

[0053] (2) Add the prepared GTA solution to the DTPA-BMA alkaline solution in Example 1, place on a magnetic stirrer and continue stirring for 30 to 60 minutes, add 5 mol / L NaOH solution dropwise to adjust the pH to 12, and finally obtain a barium strontium sulfate descaling agent. For easy distinction, the descaling agent obtained in Example 6 is named DTPA-BMA-GTA. Figure 3 , Figure 4 The curve described in DTPA-BMA-GTA.

[0054] Example 9: A method for preparing a barium strontium sulfate descaling agent, which is different from Example 8 in that tartaric acid without adding GO, specifically comprises the following steps:

[0055] (1) Add 3% tartaric acid and deionized water into a reaction bottle and place it on a magnetic stirrer and stir for 30 to 45 minutes until it is completely dissolved.

[0056] (2) The prepared tartaric acid solution was added to the DTPA-BMA alkaline solution in Example 1 at a ratio of 1:1, and the mixture was placed on a magnetic stirrer and stirred for 30 to 60 minutes. A 5 mol / L NaOH solution was added dropwise to adjust the pH to 12, and finally a barium strontium sulfate descaling agent was obtained. For easy identification, the descaling agent obtained in Example 9 was named DTPA-BMA-tartaric acid. Figure 3 , Figure 4 The curve described in DTPA-BMA-tartaric acid.

[0057] Example 10: A method for preparing a barium strontium sulfate descaling agent, which is different from Example 2 in that no additive is used, and specifically comprises the following steps:

[0058] The prepared DTPA-BMA alkaline solution was placed on a magnetic stirrer and stirred for 30 to 60 minutes, and a 5 mol / L NaOH solution was added dropwise to adjust the pH to 12, and finally a barium strontium sulfate descaling agent was obtained. For easy identification, the descaling agent in Example 10 was named DTPA-BMA. Figure 3 , Figure 4 The curve described in DTPA-BMA.

[0059] Example 11: A method for preparing a barium strontium sulfate descaling agent, which is different from Example 10 in that EDDHMA is used as a chelating agent, and specifically comprises the following steps:

[0060] (1) Weigh 5% EDDHMA into a reaction bottle, add an appropriate amount of deionized water, place on a magnetic stirrer for stirring, insert a pH meter into the reaction bottle, use a dropper to drop 5 mol / L NaOH solution into the reaction bottle to adjust the pH to 8, and continue stirring for 30 to 60 minutes until the chelating agent EDDHMA is completely dissolved to obtain an EDDHMA alkaline solution.

[0061] (2) The prepared EDDHMA alkaline solution was placed on a magnetic stirrer and stirred for 30 to 60 minutes, and a 5 mol / L NaOH solution was added dropwise to adjust the pH to 12, and finally a barium strontium sulfate descaling agent was obtained. For easy distinction, the descaling agent in Example 11 is named EDDHMA. Figure 3 , Figure 4The curve described in EDDHMA.

[0062] Example 12: A method for preparing a barium strontium sulfate descaling agent, which is different from Example 10 in that the chelating agent is HEDP, and specifically comprises the following steps:

[0063] (1) Weigh 5% HEDP into a reaction bottle, add an appropriate amount of deionized water, place on a magnetic stirrer for stirring, insert a pH meter into the reaction bottle, use a dropper to drop 5 mol / L NaOH solution into the reaction bottle to adjust the pH to 8, and continue stirring for 30 min to 60 min until the chelating agent HEDP is completely dissolved to obtain a HEDP alkaline solution.

[0064] (2) The prepared HEDP alkaline solution was placed on a magnetic stirrer and stirred for 30 to 60 minutes, and a 5 mol / L NaOH solution was added dropwise to adjust the pH to 12, and finally a barium strontium sulfate descaling agent was obtained. For easy identification, the descaling agent in Example 12 was named HEDP. Figure 3 , Figure 4 The curve described in HEDP.

[0065] Example 13: A method for preparing a barium strontium sulfate descaling agent, which is different from Example 10 in that DTPA is used as a chelating agent, and specifically comprises the following steps:

[0066] (1) Weigh 5% DTPA into a reaction bottle, add an appropriate amount of deionized water, place on a magnetic stirrer for stirring, insert a pH meter into the reaction bottle, use a dropper to drop 5 mol / L NaOH solution into the reaction bottle to adjust the pH to 8, and continue stirring for 30 to 60 minutes until the chelating agent DTPA is completely dissolved to obtain a DTPA alkaline solution.

[0067] (2) The prepared DTPA alkaline solution was placed on a magnetic stirrer and stirred for 30 to 60 minutes, and a 5 mol / L NaOH solution was added dropwise to adjust the pH to 12, and finally a barium strontium sulfate descaling agent was obtained. For easy distinction, the descaling agent in Example 12 is named DTPA. Figure 3 , Figure 4 The curve described in DTPA.

[0068] Performance Testing:

[0069] The barium strontium sulfate descaling agent obtained in Example 2-13 was applied to the descaling experiment, and the descaling performance was tested by two barium strontium sulfate scale samples with different morphologies. Specifically, first, a pre-weighed barium strontium sulfate scale sample was added to the experimental container; then, a prepared descaling agent solution was added to the experimental container, and the mass fraction of the descaling agent in the descaling agent solution was 15%; then, the experimental container was placed in a constant temperature water bath, the temperature was set to 80°C, and the descaling experiment was carried out. The scale samples were weighed and recorded at intervals of 5h, 8h, and 16h, and after the barium strontium sulfate scale was completely dissolved, the final reaction time was recorded. After the reaction was completed, the barium strontium sulfate scale sample was filtered and weighed, and its descaling rate was calculated.

[0070] The characterization results of the scale samples are shown in Figure 1 and Figure 2 , the descaling agent performance test results are shown in Figure 3-Figure 4 shown.

[0071] In summary: From Figure 1-Figure 2 It can be seen that before and after the reaction, the volume of both flaky and lump-shaped scale samples has been greatly reduced and dispersed more evenly.

[0072] from Figure 3 It can be seen that among the two barium strontium sulfate scale samples, the barium strontium sulfate descaling agents configured with GT, GC, GTA and GD have a much higher mass of scale dissolved within 8 hours than other prepared descaling agents. The descaling effect of the descaling agent prepared by chelating agent and additive is much higher than that of the descaling agent without additive, and this effect is more obvious in the second descaling agent.

[0073] from Figure 4 It can be seen that the barium strontium sulfate descaling agents configured with GT, GD, GC and GTA are 0.3598g, 0.3683g, 0.3683g, 0.3700g and 0.3650g respectively. When comparing the barium strontium sulfate descaling agents configured with GT, GD, GC and GTA in dissolving scale samples of similar mass, the descaling agent with GT added takes the least time, and the time required to completely dissolve the scale sample is 27.8h. The scale dissolving efficiency is much higher than the descaling agent with GTA as the additive, which takes 77.6h. Compared with other additives, GT shows more efficient and faster descaling performance.

[0074] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

[0075] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A method for preparing a barium strontium sulfate descaling agent, characterized in that: The prepared additive solution is added to the prepared chelating agent alkaline solution, fully mixed and dissolved, and the pH is adjusted to alkaline to obtain a barium strontium sulfate descaling agent, wherein the additive solution is one of GT (graphene oxide and triethylenetetramine compound solution), TETA (triethylenetetramine), GD (graphene oxide and diethylenetriamine compound solution), DETA (diethylenetriamine), GC (graphene oxide and citric acid compound solution), citric acid solution, GTA (graphene oxide and tartaric acid compound solution), and tartaric acid solution.

2. The method for preparing a barium strontium sulfate descaling agent according to claim 1, characterized in that: The mass fraction of the chelating agent in the chelating agent solution is 5% to 15%, and the mass fraction of the additive in the additive solution is 1% to 5%.

3. The method for preparing a barium strontium sulfate descaling agent according to claim 2, characterized in that: The preparation steps of the chelating agent alkaline solution are: (1) Weigh the required chelating agent into a beaker or volumetric flask according to the proportion, add an appropriate amount of deionized water, and place the beaker or volumetric flask containing the solution on a magnetic stirrer for stirring; (2) Adjust the pH to 8 by adding an appropriate amount of pH regulator and continue stirring for 30 to 60 minutes until the chelating agent is completely dissolved.

4. The method for preparing a barium strontium sulfate descaling agent according to claim 3, characterized in that: The chelating agent is one of DTPA-BMA (5,8-dicarboxymethyl-11-[2-(methylamino)-2-oxoethyl]-3-oxo-2,5,8,11-tetraazatridecyl-13-carboxylic acid), EDDHMA (N,N'-bis(2-hydroxy-5-methylphenyl)ethylenediamine-N,N'-diacetic acid), DTPA (pentasodium ethylenediaminetetraacetate), and HEDP (hydroxyethylidene diphosphonic acid).

5. The method for preparing a barium strontium sulfate descaling agent according to claim 2, characterized in that: The additive solution is a composite solution of graphene oxide and triethylenetetramine, and the preparation steps are: GO and TETA are uniformly mixed in a 1:1 ratio, the required mixture is weighed in proportion, an appropriate amount of deionized water is added, and the mixture is stirred on a magnetic stirrer for 30 to 45 minutes until it is completely dissolved.

6. The method for preparing a barium strontium sulfate descaling agent according to claim 2, characterized in that: The additive solution is a composite solution of graphene oxide and diethylenetriamine, and its preparation steps are: GO and DETA are uniformly mixed in a 1:1 ratio, the required mixture is weighed in proportion, an appropriate amount of deionized water is added, and the mixture is stirred on a magnetic stirrer for 30 to 45 minutes until it is completely dissolved.

7. The method for preparing a barium strontium sulfate descaling agent according to claim 2, characterized in that: The additive solution is a composite solution of graphene oxide and citric acid, and its preparation steps are: GO and citric acid are uniformly mixed in a 1:1 ratio, the required mixture is weighed in proportion, an appropriate amount of deionized water is added, and the mixture is stirred on a magnetic stirrer for 30 to 45 minutes until it is completely dissolved.

8. The method for preparing a barium strontium sulfate descaling agent according to claim 1, characterized in that: The chelating agent alkaline solution and the additive solution are mixed, placed in a magnetic stirrer and fully dissolved for 30 to 60 minutes, a pH regulator is added to adjust the pH to 12, and finally a barium strontium sulfate descaling agent is obtained.

9. The method for preparing a barium strontium sulfate descaling agent according to claim 3 or 8, characterized in that: The pH regulator uses one of NaOH, KOH, Na2CO3, and NH3·H20.

10. An application of the barium strontium sulfate descaling agent obtained by the preparation method of the barium strontium sulfate descaling agent according to claim 9, characterized in that: First, add pre-weighed barium strontium sulfate scale sample and water into the experimental container; then, add the prepared descaling agent solution into the experimental container, wherein the mass fraction of the descaling agent in the descaling agent solution is 5% to 15%; then, place the experimental container in a constant temperature water bath, set the temperature to 80°C, and conduct a descaling experiment, weigh and record the scale sample at intervals of 5h, 8h, and 16h, respectively, and record the final reaction time after the barium strontium sulfate scale is completely dissolved. After the reaction is completed, filter and weigh the barium strontium sulfate scale sample to calculate its descaling rate.

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