Scale inhibitor for high-concentration iron ions, preparation method of scale inhibitor and scale inhibition rate detection method

Abstract

The invention discloses a scale inhibitor for high-concentration iron ions, a preparation method of the scale inhibitor and a scale inhibition rate detection method, and the scale inhibitor for high-concentration iron ions is prepared by mixing and reacting the following components in percentage by mass: 20-25% of an organic phosphorus mixture, 10-15% of a metal chelating agent, 1-2% of a catalyst, a pH regulator and the balance of deionized water. According to the scale inhibitor for the high-concentration iron ions, generation of iron scales in a water body containing the high-concentration iron ions can be effectively reduced, the scale inhibition rate detection method of the scale inhibitor can rapidly complete the test process of the scale inhibition performance of the scale inhibitor for the iron scales, the test result is accurate, the test steps are simple, and the test cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, and in particular to a scale inhibitor for high-concentration iron ions, a preparation method thereof, and a scale inhibition rate detection method. Background Art

[0002] With the development of reverse osmosis technology, more and more water samples with complex components have begun to appear. Some water samples contain iron ions and ferrous ions. Ferrous ions in the solution are easily oxidized to iron ions, and iron ions are easily hydrolyzed in the solution to form iron hydroxide precipitation. Other iron scales may also be generated in water samples with more complex components. At present, there are few scale inhibitors for water samples with high concentrations of iron ions, and there are few test methods for the scale inhibition performance of scale inhibitors against iron scale, so it is impossible to systematically judge the scale inhibition performance of scale inhibitors against iron scale.

[0003] A Chinese invention patent application with publication number CN116282597A and publication date June 23, 2023 discloses a reducing scale inhibitor and a preparation method thereof. The reducing scale inhibitor has a certain scale inhibition effect on iron and manganese, but the scale inhibitor of the invention cannot achieve the expected effect on the treatment of water bodies containing high concentrations of iron ions with iron ion concentrations of 10 mg / L and above.

[0004] The Chinese invention patent application with publication number CN106669429A and publication date May 17, 2017 discloses a phosphorus-free scale inhibitor for reverse osmosis membranes. The scale inhibitor contains a macromolecular chain polymer compound. Due to the existence of electrostatic repulsion, solubilization and lattice distortion, it has good dispersing and dissolving ability for various inorganic scales and colloidal scales, can disperse the insoluble salt particles in the crystal center of the insoluble salt, reduce or control the aggregation and scaling of the insoluble salt, and can also cause the lattice distortion of the deposited crystals to achieve the purpose of scale inhibition, and is used to prevent the deposition of calcium carbonate, silicate, sulfate and phosphate scale. The scale inhibitor has a certain scale inhibition effect on water samples containing low concentrations of iron ions, but the scale inhibition effect is poor for water bodies containing high concentrations of iron ions, and cannot meet the requirements of water body treatment.

[0005] The Chinese invention patent application with publication number CN110526423A and publication date December 3, 2019 discloses a phosphorus-free water treatment agent for high-concentration iron ion circulating water. The phosphorus-free scale inhibitor in the agent can be adsorbed on inorganic scale crystals, causing the crystals to be distorted, or increasing the stress inside the large crystals, so that the crystals are easy to break, hindering the growth of scale. Organic polymers can stabilize the iron ions in the circulating water, prevent the iron ions from forming scale on the surface of the equipment, and cause under-scale corrosion; the iron ion complexing agent in the agent can complex the free iron ions in the circulating water, interfere with the reaction of Fe3+ and Fe, and reduce the corrosion caused by iron ions. However, the scale inhibitor has a poor effect on other water samples except circulating water, and when the iron ion content in the water body reaches 10 mg / L or more, the scale inhibition effect decreases. Summary of the invention

[0006] The purpose of the present invention is to provide a scale inhibitor for high-concentration iron ions, a preparation method thereof, and a scale inhibition rate detection method. The scale inhibitor can effectively reduce the generation of iron scale in water containing high-concentration iron ions. The scale inhibition rate detection method of the present invention can quickly complete the test process of the scale inhibition performance of the scale inhibitor for iron scale, and the test results are accurate, the test steps are simple, and the test cost is reduced.

[0007] In order to solve the problems existing in the prior art, the technical solution adopted by the present invention is: In a first aspect, the present invention provides a scale inhibitor for high concentration iron ions, which is prepared by mixing the following components in percentage by mass: 20-25% of organic phosphorus mixture, 10-15% of metal chelating agent, 1-2% of catalyst, pH regulator, and the balance is deionized water.

[0008] Preferably, the scale inhibitor for high-concentration iron ions is composed of, by mass percentage, 20% of an organic phosphorus mixture, 12% of a metal chelating agent, 1% of a catalyst, 0.5% of a pH regulator, and 66.5% of deionized water.

[0009] Furthermore, the organic phosphorus mixture is composed of the following components, measured by mass percentage: 50-60% 2-hydroxyphosphonoacetic acid and 40-50% polyaminopolyether-based methylenephosphonic acid; preferably 55% 2-hydroxyphosphonoacetic acid and 45% polyaminopolyether-based methylenephosphonic acid; the organic phosphorus mixture acts synergistically with a metal chelating agent to enhance scale inhibition against iron ions, conventional calcium carbonate, and calcium sulfate.

[0010] The metal chelating agent is composed of the following components: 60-70% chitosan (chitosan) and 30-40% sodium gluconate; preferably 65% ​​chitosan (chitosan) and 35% sodium gluconate; chitosan and sodium gluconate work synergistically to form a stable chelate with iron ions in water, thereby enhancing the scale inhibition effect; chitosan is non-toxic and biodegradable, and its use in water bodies will not cause secondary pollution.

[0011] The catalyst is sodium citrate, which can accelerate the reaction process.

[0012] The pH regulator is aqueous ammonia.

[0013] The scale inhibitor of the present invention is compounded according to the specific ratio, which can effectively reduce the generation of iron scale in the water body. If the content of the metal chelating agent is less than 10%, the scale inhibition effect on iron ions will be greatly reduced. If the content of the metal chelating agent is more than 15%, the scale inhibition effect on iron ions will not be significantly improved, and the cost will be greatly increased.

[0014] The metal chelating agent in the present invention can form a stable chelate with iron ions through the amino group and hydroxyl group in the molecule. The metal chelating agent is compounded with an organic phosphorus mixture, sodium citrate, ammonia water and deionized water in a specific ratio to enhance its scale inhibition effect on iron ions. In a second aspect, the present invention provides a method for preparing the scale inhibitor described in the first aspect, comprising the following steps: (1) Add deionized water to the reactor, start stirring, and raise the temperature to 40-50°C; This step needs to be heated to 40-50°C. If the temperature is lower than 40°C, the subsequent steps (2) and (3) will not react completely and the reaction time will be too long. If the temperature is higher than 50°C, impurities will appear in the subsequent steps (2) and (3), affecting the antiscaling effect of the antiscalant.

[0015] (2) Add the organic phosphorus mixture and the metal chelating agent, rotate at 60-80 rpm, and stir for 3-4 hours; this step can make the raw materials evenly mixed and react completely. In this step, since the organic phosphorus mixture and the metal chelating agent are used together, they can react with iron ions. At the same time, the organic phosphorus mixture also has a certain scale inhibition effect on calcium carbonate and calcium sulfate, which can effectively reduce the generation of iron scale in the water.

[0016] (3) Add the catalyst, rotate at 100-120 rpm, and stir for 1-2 hours. This step allows the raw materials to be evenly mixed and the reaction to be complete.

[0017] (4) Cool down to 20-25℃, add pH adjuster, rotate at 100-120 rpm, stir for 1-2h, and obtain a brown-yellow transparent liquid. This step can adjust the pH of the scale inhibitor to 3-4, reducing the impact of the agent on the system water.

[0018] In a third aspect, the present invention provides use of the scale inhibitor described in the first aspect above in reducing the generation of iron scale in water.

[0019] Furthermore, the addition amount of the antiscalant is 5-20 ppm, preferably 20 ppm.

[0020] In a fourth aspect, the present invention provides a method for detecting the scale inhibition rate of the scale inhibitor described in the first aspect, comprising the following steps: (1) Take several clean experimental containers and label them respectively; (2) Use a pipette to transfer ferrous sulfate solution into the experimental container; (3) Take a certain amount of scale inhibitor and add it into the experimental container in sequence; (4) Use a pipette to transfer the borax solution to the experimental container, and then add deionized water to the experimental container until the volume of the solution is 100 ml. Adding borax in this step can accelerate the conversion of ferrous ions in the solution to ferric ions. This is because the borax solution can combine with ferric ions to form ferric ion complexes, which promotes the oxidation of ferrous ions to ferric ions by contacting with oxygen.

[0021] (5) At the same time, seal all experimental containers and keep them in a water bath at a constant temperature of 30-35°C for 22-24 hours; (6) Take out the experimental container and cool it to room temperature, and filter the solution into a beaker; (7) Detect the iron ion concentration in the filtrate, repeat the measurement three times, and take the average value; (8) The scale inhibition performance of the scale inhibitor is analyzed based on the above measured values.

[0022] Preferably, the number of the experimental containers is 5.

[0023] Furthermore, the dosage of the ferrous sulfate is 3.53 ml-7.07 ml, and the concentration of the ferrous sulfate solution is 0.1-0.2 mol / L.

[0024] Preferably, the addition amounts of the scale inhibitor in the five experimental containers are 0, 5, 10, 15, and 20 ppm, respectively.

[0025] Furthermore, the dosage of the borax solution is 10-15 ml, and the concentration of the borax solution is 3.8-4.0 g / L.

[0026] The advantages and beneficial effects of the present invention are: The scale inhibitor for high-concentration iron ions of the present invention can effectively reduce the generation of iron scale in water containing high-concentration iron ions. The scale inhibition rate detection method of the scale inhibitor of the present invention can quickly complete the test process of the scale inhibition performance of the scale inhibitor for iron scale, and the test result is accurate, the test steps are simple, and the test cost is reduced. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application are clearly described below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of the present application.

[0028] The experimental methods in the following examples, unless otherwise specified, are all conventional methods, and are performed according to the techniques or conditions described in the literature in the field or according to the product instructions. The materials, reagents, etc. used in the following examples, unless otherwise specified, can all be obtained from commercial channels.

[0029] Example 1 The present embodiment provides a scale inhibitor for high-concentration iron ions, and its composition, in terms of mass percentage, is: 20% of an organic phosphorus mixture, 12% of a metal chelating agent, 1% of sodium citrate, 0.5% of ammonia water, and 66.5% of deionized water.

[0030] In this embodiment, the composition of the organic phosphorus mixture is, by mass percentage, 55% of 2-hydroxyphosphonoacetic acid and 45% of polyaminopolyether methylenephosphonic acid.

[0031] The metal chelating agent is composed of 65% deacetyl chitosan and 35% sodium gluconate in terms of mass percentage.

[0032] The present embodiment provides a method for preparing a scale inhibitor for high-concentration iron ions, comprising the following steps: a. Add 66.5 kg of deionized water to the reactor, start stirring, and raise the temperature to 45°C.

[0033] b. Add 20 kg of organophosphorus mixture and 12 kg of metal chelating agent, rotate at 70 rpm, and stir for 3 h.

[0034] c. Add 1 kg of sodium citrate, rotate at 110 rpm, and stir for 1 hour.

[0035] d. Cool down to 25°C, add 0.5 kg of aqueous ammonia, rotate at 110 rpm, stir for 1 h to obtain a brown-yellow transparent liquid.

[0036] The scale inhibitor for high-concentration iron ions in this embodiment is added in an amount of 5-20 ppm when used to reduce the generation of iron scale in water.

[0037] Example 2 This embodiment provides a scale inhibitor for high-concentration iron ions. The difference between this embodiment and embodiment 1 is that, by mass percentage, its components are: 25% organic phosphorus mixture, 10% metal chelating agent, 1% sodium citrate, 0.5% ammonia water, and 63.5% deionized water. The rest is the same as embodiment 1.

[0038] Example 3 This embodiment provides a scale inhibitor for high-concentration iron ions. The difference between this embodiment and embodiment 1 is that, by mass percentage, its components are: 22% organic phosphorus mixture, 15% metal chelating agent, 1% sodium citrate, 0.5% ammonia water, and 61.5% deionized water. The rest is the same as embodiment 1.

[0039] Example 4 This embodiment provides a scale inhibitor for high concentration iron ions. The only difference between this embodiment and embodiment 1 is that the composition of the organic phosphorus mixture, by mass percentage, is: 50% 2-hydroxyphosphonoacetic acid and 50% polyaminopolyether methylenephosphonic acid, and the rest is the same as embodiment 1.

[0040] Example 5 This embodiment provides a scale inhibitor for high concentration iron ions. The only difference between this embodiment and embodiment 1 is that the composition of the organic phosphorus mixture, by mass percentage, is: 60% 2-hydroxyphosphonoacetic acid and 40% polyaminopolyether methylenephosphonic acid, and the rest is the same as embodiment 1.

[0041] Example 6 This embodiment provides a scale inhibitor for high concentration iron ions. The difference between this embodiment and embodiment 1 is that the metal chelating agent is composed of 60% deacetylated chitosan (chitosan) and 40% sodium gluconate in terms of mass percentage. The rest is the same as embodiment 1.

[0042] Example 7 This embodiment provides a scale inhibitor for high-concentration iron ions. The difference between this embodiment and embodiment 1 is that the metal chelating agent is composed of 70% deacetylated chitosan (chitosan) and 30% sodium gluconate in terms of mass percentage. The rest is the same as embodiment 1.

[0043] Comparative Example 1 This comparative example provides a scale inhibitor for high-concentration iron ions. The difference between this comparative example and Example 1 is that carboxymethyl cellulose is used instead of deacetylated chitosan, and the rest is the same as Example 1.

[0044] Comparative Example 2 This comparative example provides a scale inhibitor for high-concentration iron ions. The difference between this comparative example and Example 1 is that, by mass percentage, its components are: 30% organic phosphorus mixture, 2% metal chelating agent, 1% sodium citrate, 0.5% ammonia water, and 66.5% deionized water. The rest is the same as Example 1.

[0045] Comparative Example 3 This comparative example provides a scale inhibitor for high-concentration iron ions, and its composition is as follows by mass percentage: 32% organic phosphorus mixture, 1% sodium citrate, 0.5% ammonia water, and 66.5% deionized water. The rest is the same as in Example 1.

[0046] Comparative Example 4 This comparative example provides a scale inhibitor for high-concentration iron ions, and its composition is as follows by mass percentage: 32% metal chelating agent, 1% sodium citrate, 0.5% ammonia water, and 66.5% deionized water. The rest is the same as in Example 1.

[0047] Example 8 This embodiment provides a method for testing the scale inhibition performance of a scale inhibitor against iron scale, comprising the following steps: (1) Take 5 clean conical flasks and label them respectively; (2) Use a pipette to transfer 3.53 ml of ferrous sulfate solution into each conical flask, where the concentration of the ferrous sulfate solution is 0.1 mol / L; (3) The scale inhibitor prepared in Example 1 was measured and added into five conical flasks in the following order: 0, 5, 10, 15, and 20 ppm; (4) Use a pipette to transfer 15 ml of borax solution into five conical flasks respectively, and then add deionized water to make the total volume of the solution 100 ml. The concentration of the borax solution is 3.8 g / L. (5) Seal all conical flasks and place them in a water bath to maintain a constant temperature of 35°C for 24 hours.

[0048] (6) Take out the conical flask and cool it to room temperature, and filter the solution into a beaker; (7) The iron ion concentration in the filtrate after being placed in the first conical flask without adding the scale inhibitor for 24 h and in the filtrate after being placed in the second to fourth conical flasks with the scale inhibitor for 24 h was measured three times. The results were 0 / 0 / 0, 9.4 / 9.5 / 9.6, 10 / 10 / 10, 10 / 10 / 10, and 10 / 10 / 10, respectively. The average values ​​were 0, 9.5, 10, 10, and 10, respectively.

[0049] (8) Calculate the scale inhibition rate of the scale inhibitor: The calculation formula for scale inhibition rate = (iron ion content in the solution after adding scale inhibitor for 24 hours - iron ion content in the solution after not adding scale inhibitor for 24 hours) / (iron ion content added to the solution - iron ion content in the solution after not adding scale inhibitor for 24 hours) * 100%.

[0050] That is, when the addition amount of the scale inhibitor prepared in Example 1 is 0 ppm, the scale inhibition rate = 0-0 / 10-0*100% = 0.

[0051] When the addition amount of the scale inhibitor prepared in Example 1 is 5 ppm, the scale inhibition rate = 9.5-0 / 10-0*100% = 95%.

[0052] When the addition amount of the scale inhibitor prepared in Example 1 is 10 ppm, the scale inhibition rate = 10-0 / 10-0*100% = 100%.

[0053] When the addition amount of the scale inhibitor prepared in Example 1 is 15 ppm, the scale inhibition rate = 10-0 / 10-0*100% = 100%.

[0054] When the addition amount of the scale inhibitor prepared in Example 1 is 20 ppm, the scale inhibition rate = 10-0 / 10-0*100% = 100%.

[0055] In this test method, the active ingredients in the scale inhibitor react with the iron ions in the water to form a stable chelate, which prevents the iron ions from forming scale. The higher the iron ion content in the solution, the better the scale inhibition effect.

[0056] Example 9 This embodiment provides a method for testing the scale inhibition performance of a scale inhibitor against iron scale. The difference between this embodiment and embodiment 8 is that in step (2), 7.07 ml of ferrous sulfate solution is respectively pipetted with a pipette and added to conical flasks, wherein the concentration of the ferrous sulfate solution is 0.1 mol / L; the rest is the same as embodiment 8. The iron ion concentration in the filtrate in the five conical flasks is respectively detected, and the measurement is repeated three times, which are 0 / 0 / 0, 8.7 / 8.8 / 8.9, 9.6 / 9.7 / 9.5, 10 / 10 / 10, 10 / 10 / 10, and the average values ​​are 0, 8.8, 9.6, 10, and 10, respectively.

[0057] (8) Calculate the scale inhibition rate of the scale inhibitor: The calculation formula for scale inhibition rate = (iron ion content in the solution after adding scale inhibitor for 24 hours - iron ion content in the solution after not adding scale inhibitor for 24 hours) / (iron ion content added to the solution - iron ion content in the solution after not adding scale inhibitor for 24 hours) * 100%.

[0058] That is, when the addition amount of the scale inhibitor prepared in Example 1 is 0 ppm, the scale inhibition rate = 0-0 / 10-0*100% = 0.

[0059] When the addition amount of the scale inhibitor prepared in Example 1 is 5 ppm, the scale inhibition rate = 8.8-0 / 10-0*100% = 88%.

[0060] When the addition amount of the scale inhibitor prepared in Example 1 is 10 ppm, the scale inhibition rate = 9.6-0 / 10-0*100% = 96%.

[0061] When the addition amount of the scale inhibitor prepared in Example 1 is 15 ppm, the scale inhibition rate = 10-0 / 10-0*100% = 100%.

[0062] When the addition amount of the scale inhibitor prepared in Example 1 is 20 ppm, the scale inhibition rate = 10-0 / 10-0*100% = 100%.

[0063] In this test method, the active ingredients in the scale inhibitor react with the iron ions in the water to form a stable chelate, which prevents the iron ions from forming scale. The higher the iron ion content in the solution, the better the scale inhibition effect.

[0064] Experimental Example 1 According to the methods described in Examples 8 and 9, the scale inhibition performance of the organic phosphorus mixture and the metal chelating agent described in Example 1 and the scale inhibitors described in Examples 1-7, Publication No. CN116282597A, Publication No. CN106669429A, Publication No. CN110526423A, and Comparative Examples 1-4 were tested respectively. The scale inhibition test results are shown in Tables 1 and 2: Table 1: When the iron ion content in the solution is 10ppm, the scale inhibition rate of each group of scale inhibitors

[0065] According to Table 1, when the iron ion content in the solution is 10ppm and the addition amount of the scale inhibitor is 5-20ppm, the scale inhibition rate of Examples 1-7 reaches 91-100%, and the scale inhibition performance is significantly better than that of other groups. Among them, Example 1 has the best effect, and the scale inhibition rate can reach 95-100%, especially when the addition amount of the scale inhibitor in Example 1 is 10-20ppm, the scale inhibition rate can reach 100%. Table 2: When the iron ion content in the solution is 20ppm, the scale inhibition rate of each group of scale inhibitors

[0066] According to Table 2, when the iron ion content in the solution is 20ppm and the addition amount of the scale inhibitor is 5-20ppm, the scale inhibition rate of Examples 1-7 reaches 84-100%, and the scale inhibition performance is significantly better than that of other groups. Among them, Example 1 has the best effect, and the scale inhibition rate can reach 88-100%, especially when the addition amount of the scale inhibitor in Example 1 is 15-20ppm, the scale inhibition rate can reach 100%.

[0067] It can be seen from Tables 1 and 2 that using only a single organic phosphorus mixture or metal chelating agent as a scale inhibitor will result in a poor scale inhibition rate because no synergistic effect can be produced.

[0068] Comparative Example 1 uses carboxymethyl cellulose instead of deacetyl chitosan. Since the carboxyl and hydroxyl groups contained in carboxymethyl cellulose are more easily combined with themselves, only a small part of them can form a complex with the iron ions in the water, thus causing a significant decrease in its scale inhibition efficiency.

[0069] In Comparative Example 2, the content of the organic phosphorus mixture was too high and the content of the metal chelating agent was too low, resulting in a decrease in the scale inhibition rate.

[0070] In Comparative Example 3, due to the lack of metal chelating agent, the synergistic effect disappears, resulting in a significant decrease in the scale inhibition rate.

[0071] In Comparative Example 4, due to the lack of an organic phosphorus mixture, the synergistic effect disappears, resulting in a significant decrease in the scale inhibition rate.

[0072] The embodiments of the present application are described above, but the present application is not limited to the above-mentioned specific implementation modes. The above-mentioned specific implementation modes are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A scale inhibitor for high concentration iron ions, characterized in that: In terms of mass percentage, it is formed by mixing and reacting the following components: 20-25% of organic phosphorus mixture, 10-15% of metal chelating agent, 1-2% of catalyst, pH adjusting agent, and the balance is deionized water.

2. The scale inhibitor for high concentration iron ions according to claim 1, characterized in that: In terms of mass percentage, the organic phosphorus mixture consists of the following components: 50-60% of 2-hydroxyphosphonoacetic acid and 40-50% of polyaminopolyether methylenephosphonic acid; The metal chelator is composed of the following components: 60-70% chitosan and 30-40% sodium gluconate; The catalyst is sodium citrate; The pH regulator is aqueous ammonia.

3. The method for preparing a scale inhibitor for high concentration iron ions according to claim 1 or 2, characterized in that: The following steps are involved: (1) Add deionized water to the reactor, stir, and heat to 40-50°C; (2) Add the organophosphorus mixture and metal chelating agent, rotate at 60-80 rpm, and stir for 3-4 hours; (3) Add the catalyst, rotate at 100-120 rpm, and stir for 1-2 hours; (4) Cool down to 20-25°C, add pH adjuster, rotate at 100-120 rpm, stir for 1-2 h, and obtain a brown-yellow transparent liquid.

4. Use of the scale inhibitor for high concentration iron ions as claimed in claim 1 or 2 in reducing the generation of iron scale in water.

5. The use according to claim 4, characterized in that: The addition amount of the antiscalant is 5-20 ppm.

6. The method for detecting the scale inhibition rate of a scale inhibitor for high-concentration iron ions according to claim 1 or 2, characterized in that: The following steps are involved: (1) Take several clean experimental containers and label them respectively; (2) Pipette ferrous sulfate solution into the experimental container; (3) Take a certain amount of scale inhibitor and add it into the experimental container in sequence; (4) Pipette borax solution into the experimental container, and then add deionized water to make up to 100 ml; (5) At the same time, seal all experimental containers and keep them in a water bath at a constant temperature of 30-35°C for 22-24 hours; (6) Take out the experimental container and cool it to room temperature, and filter the solution into a beaker; (7) Detect the iron ion concentration in the filtrate, repeat the measurement three times, and take the average value; (8) The scale inhibition performance of the scale inhibitor can be obtained through the above measured values.

7. The method for detecting the scale inhibition rate of a scale inhibitor for high-concentration iron ions according to claim 6, characterized in that: The number of experimental containers is 5.

8. The method for detecting the scale inhibition rate of a scale inhibitor for high-concentration iron ions according to claim 6, characterized in that: The dosage of the ferrous sulfate is 3.53 ml-7.07 ml, and the concentration of the ferrous sulfate solution is 0.1-0.2 mol / L.

9. The method for detecting the scale inhibition rate of a scale inhibitor for high-concentration iron ions according to claim 6, characterized in that: The addition amounts of the antiscalant in the five experimental containers were 0, 5, 10, 15, and 20 ppm, respectively.

10. The method for detecting the scale inhibition rate of a scale inhibitor for high-concentration iron ions according to claim 6, characterized in that: The dosage of the borax solution is 10-15 ml, and the concentration of the borax solution is 3.8-4.0 g / L.

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