Method for rapidly measuring content of water-soluble manganese in electrolytic manganese slag

Abstract

The invention discloses a method for rapidly determining the content of water-soluble manganese in electrolytic manganese residues. The method comprises the following steps: S1, preparing an electrolytic manganese residue leachate; s2, pure water is added into the leachate; s3, adding an acidifying agent into the leachate; s4, adding an oxidizing agent into the leachate, and heating and boiling for 5min; s5, adding a reducing agent into the leachate, and heating and boiling for 10min; and S6, titrating with an oxidizing agent, and calculating the content of water-soluble manganese in the electrolytic manganese residues according to the titration volume. The method for rapidly measuring the content of the water-soluble manganese in the electrolytic manganese residues reduces the difficulty, is simple to operate, does not need expensive instruments and equipment, is not interfered by other elements, is short in detection period, is completely suitable for industrial detection, can better and more rapidly realize rapid measurement of the content of the water-soluble manganese in the electrolytic manganese residues, and is suitable for large-scale popularization and application. And the content index of the water-soluble manganese in the electrolytic manganese slag is effectively monitored.

Description

Technical Field

[0001] The invention relates to the field of measurement, and in particular to a method for quickly determining the water-soluble manganese content in electrolytic manganese slag. Background Art

[0002] Electrolytic manganese metal is an important metallurgical product and strategic resource in my country, and it occupies a pivotal position in the national economy. However, in the production process, every ton of electrolytic manganese metal produced will produce 5 to 10 tons of electrolytic manganese slag. These electrolytic manganese slags contain a large amount of water-soluble divalent manganese. If not treated, these manganese elements may penetrate into the soil and water bodies with the erosion of rainwater, causing serious pollution to the environment.

[0003] At present, my country has not yet formulated national standards or industry standards for the detection of water-soluble manganese in electrolytic manganese slag. Usually, the leaching solution of electrolytic manganese slag is prepared according to the procedure of "Toxicity Leaching Method of Solid Waste" (GB / T 5086.1-1997), and then the manganese concentration in the leaching solution is detected according to the "Standard Test Method for Drinking Water" (GB / T 5750.6-2023).

[0004] When the method in GB / T 5750.6-2023 is used to determine the manganese concentration, the ammonium persulfate spectrophotometry, formaldehyde oxime spectrophotometry and silver potassium periodate spectrophotometry will be affected by a variety of interfering elements during the determination process, and a large amount of reagents are required, and these reagents are often toxic and harmful. In addition, the operating steps of these methods are also quite complicated.

[0005] However, due to the high manganese concentration in the leachate, flame atomic absorption spectrometry, inductively coupled plasma emission spectrometry and inductively coupled plasma mass spectrometry need to dilute the leachate to a certain multiple before detection. This dilution process may introduce errors. At the same time, these methods require the use of expensive instruments and high skills of the operators.

[0006] Direct titration with potassium permanganate standard solution is also a method, but due to the possible presence of organic matter and reducing Fe2+ ions in the leachate, this method may consume potassium permanganate and lead to inaccurate test results. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a method for quickly determining the water-soluble manganese content in electrolytic manganese slag.

[0008] The present invention is achieved through the following technical solutions:

[0009] The present invention discloses a method for rapidly determining the content of water-soluble manganese in electrolytic manganese slag, comprising the following steps:

[0010] S1, preparing electrolytic manganese manganese slag leaching solution;

[0011] S2. Add pure water to the leaching solution and stir evenly;

[0012] S3, adding acidifier to the leaching solution and stirring evenly;

[0013] S4, add oxidant to the leaching solution, stir evenly, heat to boil and keep for 5 minutes;

[0014] S5, adding a reducing agent to the leaching solution, stirring evenly, heating to boil and maintaining for 10 minutes; S6, titrating the leaching solution with an oxidizing absorbent, and calculating the total amount of water-soluble manganese in the electrolytic manganese slag based on the titrated volume.

[0015] The present invention enables manganese to exist in a measurable form through a series of chemical reactions, thereby achieving efficient analysis. In particular, heating and stirring promote the dissolution of manganese ions, which is crucial for improving detection sensitivity and accuracy. Combined with the needs of modern laboratories, this method can quickly respond to changes in manganese content in industrial production and environmental monitoring, and improve processing efficiency.

[0016] Preferably, the above-mentioned preparation of electrolytic manganese manganese slag leaching solution comprises the following steps:

[0017] S1. Take electrolytic manganese slag, weigh and record its mass;

[0018] S2. Put the manganese slag into a container, add deionized water, and soak for 20min-60min;

[0019] S3, leaching for 1 to 2 hours, stirring continuously for 15 to 30 minutes at the beginning of leaching to ensure that the manganese slag is fully in contact with water to promote dissolution, and then stirring once every 10-15 minutes; the stirring rate is maintained at 100-300 revolutions per minute;

[0020] S4. Finally, the leachate is separated from the solid residue by filter paper or other suitable filter media, and the filtered leachate is collected.

[0021] During this process, the quality of the manganese slag is recorded to ensure the traceability and repeatability of the results. The soaking and stirring time is set to 20 minutes to 60 minutes to ensure the dissolution efficiency of different types of manganese slag, especially those with larger particles or complex components. The filtration step ensures the purity of the liquid sample, thereby avoiding interference with subsequent measurements caused by solid particles.

[0022] Preferably, the titration volume to calculate the total amount of water-soluble manganese in the electrolytic manganese slag comprises the following steps:

[0023] S1. Titration preparation: transfer the prepared leachate into the titration bottle and record its volume;

[0024] S2, add indicator, add 1-2 drops of phenolphthalein solution to the leaching solution to observe the titration endpoint;

[0025] S3, titration is performed, potassium permanganate is used as an oxidizing absorbent, and is slowly added to the leachate while slowly stirring until the color changes from colorless to pink, indicating that the titration endpoint has been reached;

[0026] S4. Record data, record the consumption of the oxidizing absorbent, i.e., the titration volume;

[0027] S5. Calculate the total amount of water-soluble manganese. Based on the known concentration of the oxidizing absorbent and the volume consumed, use the formula: total amount of water-soluble manganese = oxidizing absorbent concentration × consumed volume × molar ratio × sample dilution. Calculate the content of water-soluble manganese in proportion:

[0028] S6. Summarize the results and record the calculated results to obtain the water-soluble manganese content in the electrolytic manganese slag.

[0029] The advantage of this titration method is its simplicity and efficiency, and it can obtain accurate results in a short time. At the same time, the use of potassium permanganate as an oxidant not only has a fast reaction but also mild reaction conditions, which is suitable for conventional laboratory environments. The result summary step provides reliable data support for subsequent analysis and decision-making, which helps to optimize the production process of electrolytic manganese.

[0030] Preferably, the ratio of the electrolytic manganese manganese slag leaching solution, acidifier, oxidant, and reductant is 2:2:1:2. Reasonable ratio design ensures the efficiency and stability of the reaction and avoids the measurement error caused by excessive or insufficient reagents. The selection of this ratio is based on the preliminary test results of different manganese slags in the laboratory, which can effectively improve the selectivity of the reaction, reduce unnecessary side reactions, and thus improve the reliability of the overall measurement.

[0031] Preferably, the oxidant is a standard solution of KMnO4=0.01 mol / L. Using a standard solution as an oxidant not only ensures the consistency and repeatability of the reaction, but also provides a necessary benchmark for the calculation of the results. This standardized operating procedure provides an operational template for the laboratory, which helps to improve the overall experimental efficiency.

[0032] Preferably, the acidulant is a sulfuric acid solution. The selection of sulfuric acid as an acidulant is based on its excellent solubility and relatively low cost. It can effectively reduce the pH value of the solution and provide the necessary environment for the subsequent redox reaction. At the same time, sulfuric acid is widely used in laboratories and has high operational safety, making the experimental process more reliable.

[0033] Preferably, the acidic reducing agent is a sodium bisulfite solution. Sodium bisulfite is selected because it has good selectivity and stability as a reducing agent, and can effectively reduce the oxidation state of manganese under specific conditions to ensure accurate determination of manganese. Its reducing properties make it highly adaptable in different chemical environments, reducing the stringent requirements for reaction conditions.

[0034] Preferably, the volume concentration of the sulfuric acid solution is 10%. While providing a sufficiently acidic environment, the 10% sulfuric acid solution avoids the corrosion of manganese slag and damage to instruments caused by excessive concentration. The selection of this concentration is based on the optimization of experimental data, ensuring that while ensuring the complete dissolution of manganese, the potential harm to the environment and personnel is reduced.

[0035] Preferably, the mass concentration of the sodium bisulfite solution is 5%. The 5% sodium bisulfite solution exhibits excellent reducing ability in the experiment, can effectively react with the oxidant, and ensure the accuracy and reliability of the determination. The selection of the concentration is the result of multiple experimental verifications, which ensures the smooth progress of the reaction at room temperature and provides a stable chemical environment for subsequent steps.

[0036] The beneficial effects of the present invention are: simplifying the operation process, not requiring expensive instruments and equipment, and not being interfered by other elements. The present invention has a short detection cycle, is very suitable for industrial large-scale detection, can efficiently and accurately monitor the water-soluble manganese content in electrolytic manganese slag, and provides effective technical support for environmental management and resource recovery of the electrolytic manganese industry.

[0037] In addition, through precise analysis and monitoring, the present invention helps enterprises to adjust production processes in a timely manner, reduce environmental impacts, achieve rational utilization and regeneration of resources, provide a basis for the recycling of manganese, and help achieve green development goals. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with specific embodiments:

[0039] Embodiment: A method for rapidly determining the water-soluble manganese content in electrolytic manganese slag comprises the following steps: S1, preparing an electrolytic manganese slag leaching solution;

[0040] S2. Add pure water to the leaching solution and stir evenly;

[0041] S3, adding acidifier to the leaching solution and stirring evenly;

[0042] S4, add oxidant to the leaching solution, stir evenly, heat to boil and keep for 5 minutes;

[0043] S5, adding a reducing agent to the leaching solution, stirring evenly, heating to boil and maintaining for 10 minutes; S6, titrating the leaching solution with an oxidizing absorbent, and calculating the total amount of water-soluble manganese in the electrolytic manganese slag based on the titrated volume.

[0044] The present invention enables manganese to exist in a measurable form through a series of chemical reactions, thereby achieving efficient analysis. In particular, heating and stirring promote the dissolution of manganese ions, which is crucial for improving detection sensitivity and accuracy. Combined with the needs of modern laboratories, this method can quickly respond to changes in manganese content in industrial production and environmental monitoring, and improve processing efficiency.

[0045] The above-mentioned preparation of electrolytic manganese manganese slag leaching solution comprises the following steps:

[0046] S1. Take electrolytic manganese slag, weigh and record its mass;

[0047] S2. Put the manganese slag into a container, add deionized water, and soak for 20min-60min;

[0048] S3, leaching for 1 to 2 hours, stirring continuously for 15 to 30 minutes at the beginning of leaching to ensure that the manganese slag is fully in contact with water to promote dissolution, and then stirring once every 10-15 minutes; the stirring rate is maintained at 100-300 revolutions per minute;

[0049] S4. Finally, the leachate is separated from the solid residue by filter paper or other suitable filter media, and the filtered leachate is collected.

[0050] During this process, the quality of the manganese slag is recorded to ensure the traceability and repeatability of the results. The soaking and stirring time is set to 20 minutes to 60 minutes to ensure the dissolution efficiency of different types of manganese slag, especially those with larger particles or complex components. The filtration step ensures the purity of the liquid sample, thereby avoiding interference with subsequent measurements caused by solid particles.

[0051] The above titration volume to calculate the total amount of water-soluble manganese in the electrolytic manganese slag comprises the following steps:

[0052] S1. Titration preparation: transfer the prepared leachate into the titration bottle and record its volume;

[0053] S2, add indicator, add 1-2 drops of phenolphthalein solution to the leaching solution to observe the titration endpoint;

[0054] S3, titration is performed, potassium permanganate is used as an oxidizing absorbent, and is slowly added to the leachate while slowly stirring until the color changes from colorless to pink, indicating that the titration endpoint has been reached;

[0055] S4. Record data, record the consumption of the oxidizing absorbent, i.e., the titration volume;

[0056] S5. Calculate the total amount of water-soluble manganese. Based on the known concentration of the oxidizing absorbent and the volume consumed, use the formula: total amount of water-soluble manganese = oxidizing absorbent concentration × consumed volume × molar ratio × sample dilution. Calculate the content of water-soluble manganese in proportion:

[0057] S6. Summarize the results and record the calculated results to obtain the water-soluble manganese content in the electrolytic manganese slag.

[0058] The advantage of this titration method is its simplicity and efficiency, and it can obtain accurate results in a short time. At the same time, the use of potassium permanganate as an oxidant not only has a fast reaction but also mild reaction conditions, which is suitable for conventional laboratory environments. The result summary step provides reliable data support for subsequent analysis and decision-making, which helps to optimize the production process of electrolytic manganese.

[0059] The ratio of the electrolytic manganese slag leaching solution, acidifier, oxidant and reductant is 2:2:1:2. The reasonable ratio design ensures the high efficiency and stability of the reaction and avoids the measurement error caused by excessive or insufficient reagents. The selection of this ratio is based on the preliminary test results of different manganese slags in the laboratory, which can effectively improve the selectivity of the reaction, reduce unnecessary side reactions, and thus improve the reliability of the overall measurement.

[0060] The above oxidant is a standard solution of KMnO4 = 0.01 mol / L. Using a standard solution as an oxidant not only ensures the consistency and repeatability of the reaction, but also provides a necessary benchmark for the calculation of the results. This standardized operating procedure provides an operational template for the laboratory, which helps to improve the overall experimental efficiency.

[0061] The above acidifier is a sulfuric acid solution. Sulfuric acid is selected as an acidifier based on its excellent dissolving power and relatively low cost. It can effectively reduce the pH value of the solution and provide the necessary environment for the subsequent redox reaction. At the same time, sulfuric acid is widely used in laboratories and has high operational safety, making the experimental process more reliable.

[0062] The acidic reducing agent is a sodium bisulfite solution. Sodium bisulfite is selected because it has good selectivity and stability as a reducing agent, and can effectively reduce the oxidation state of manganese under specific conditions to ensure accurate determination of manganese. Its reducing properties make it highly adaptable in different chemical environments, reducing the stringent requirements for reaction conditions.

[0063] The volume concentration of the sulfuric acid solution is 10%. While providing a sufficiently acidic environment, the 10% sulfuric acid solution avoids the corrosion of manganese slag and damage to the instrument due to excessive concentration. The selection of this concentration is based on the optimization of experimental data, ensuring that while ensuring the complete dissolution of manganese, it reduces the potential harm to the environment and personnel.

[0064] The mass concentration of the sodium bisulfite solution is 5%. The 5% sodium bisulfite solution showed excellent reducing ability in the experiment and could effectively react with the oxidant to ensure the accuracy and reliability of the determination. The selection of the concentration is the result of multiple experimental verifications, which ensures the smooth progress of the reaction at room temperature and provides a stable chemical environment for subsequent steps.

[0065] Operation examples:

[0066] According to the method for quickly determining the water-soluble manganese content in electrolytic manganese slag proposed by the present invention, the following steps are performed:

[0067] S1: Take fresh electrolytic manganese slag and measure the moisture content (n, expressed as a decimal), weigh 70 / (1-n) fresh electrolytic manganese slag into 700 ml of pure water, prepare the leaching solution according to the method provided by the present invention or prepare the electrolytic manganese slag leaching solution according to the leaching procedure of "Toxicity Leaching Method for Solid Waste Leaching" (GB / T5086.1-1997), filter, and shake well;

[0068] S2: Accurately transfer 10 ml of the extract into a 300 ml conical flask, add 60 ml of pure water, and shake well;

[0069] S3: Add 10 ml of acidifier to the leaching solution, the acidifier is prepared by adding 100 ml of sulfuric acid (analytical grade) to a constant volume of 1000 ml with water;

[0070] S4: The leachate is added to 5 ml of oxidant and heated to boil for 5 min to ensure that the interfering substances and reducing ions in the leachate react completely with the oxidant. The oxidant is a KMnO4 = 0.01 mol / L standard solution, which is prepared by adding 0.1600 g of potassium permanganate to 1000 ml with water. The preparation process refers to GB / T 601-2002;

[0071] S5: Add 10 ml of reducing agent to the leachate, heat and boil for 10 min to ensure that the unreacted reducing agent is heated and completely reacted and decomposed. The reducing agent is prepared by adding 50 g of sodium bisulfite to 1000 ml with water;

[0072] S6: Titrate with an oxidant and calculate the total amount of water-soluble manganese in the electrolytic manganese slag based on the titration volume, that is, titrate with an oxidant (KMnO4=0.01mol / L standard solution) to a light pink end point to calculate the total amount of water-soluble manganese in the electrolytic manganese slag.

[0073] The method for quickly determining the water-soluble manganese content in the electrolytic manganese slag of the present invention adopts a comparative verification method, and the specific steps are as follows:

[0074] Standard sample test:

[0075] Take 10ml of each standard material with a Mn content of 1000mg / l, place them in 300ml conical flasks, add 60mL of pure water, and shake well; add 10ml of acidifier, which is 10% sulfuric acid solution (volume concentration); add to 5ml of oxidant, heat and boil for 5min to ensure that the interfering substances and reducing ions in the leachate react completely with the oxidant, the oxidant is KMnO4=0.01mol / L standard solution; add 10ml of reducing agent, heat and boil for 10min to ensure that the unreacted reducing agent is heated and completely decomposed, the reducing agent is 5% sodium bisulfite solution (mass concentration); titrate with oxidant (KMnO4=0.01mol / L standard solution) to a light pink color as the end point, and calculate the manganese content of the standard substance solution; calculation formula ρMn 2+ =[3×C KMnO4 ×V 滴定 / 2-0.005×C KMnO4 ]×M / V 样 (M is the molecular weight of Mn). The measurement results are shown in Table 1 below. The data show that the method of the present invention has good accuracy and precision. The standard deviation RSD of the manganese content in the leaching solution is 0.65%, and the relative error is between -0.64% and 1.01%.

[0076]

[0077] Electrolytic manganese slag water-soluble manganese sample experiment:

[0078] Take 5 different portions of fresh electrolytic manganese slag and measure the moisture content (n, expressed as a decimal), weigh 70 / (1-n) of the fresh electrolytic manganese slag into 700 ml of pure water, and leaching according to the "Toxicity Leaching Method for Solid Waste" (GB / T 5086.1-1997) leaching procedure to prepare electrolytic manganese slag leachate, filter, shake well; take 10 ml of each leachate, 5 portions each, place them in 300 ml conical flasks, add 60 ml of pure water, shake well; add 10 ml of acidifier, the acidifier is 10% sulfuric acid solution (volume concentration); add to 5 ml of oxidant, heat and boil for 5 min, ensure that the interfering substances and reducing ions in the leachate react completely with the oxidant, the oxidant is KMnO4=0.01 mol / L standard solution; add 10 ml of reducing agent, heat and boil for 10 min, ensure that the unreacted reducing agent is heated and completely reacted and decomposed, the reducing agent is 5% sodium bisulfite solution (mass concentration); titrate with oxidant (KMnO4=0.01 mol / L standard solution) to light pink as the end point, calculate the manganese content of the leachate, the calculation formula is ρMn 2+ =[3×C KMnO4 ×V 滴定 / 2-0.005×C KMnO4 ]×M / V 样 (M is the molecular weight of Mn). The water-soluble manganese content (dry basis) of the electrolytic manganese slag is calculated according to the manganese content of the leachate. The calculation formula S = [1 + (0.1n / 1-n)] × C × Ls / Ms × 100%, S-water-soluble manganese content in manganese slag (dry basis), %; n-water content of manganese slag, expressed as a decimal; C-manganese concentration in the electrolytic manganese slag leachate, g / L; Ls-volume of leachate (0.7L): Ms manganese slag dry basis weight, 70g; (refer to 6.1.16 in Document No. 61 of Development and Reform Commission

[2023] ). The measurement results are shown in Table 2 below, which shows that the present invention has good accuracy and precision, and the standard deviation RSD range of the detection of soluble manganese content in electrolytic manganese slag is between 0.63-1.10%.

[0079]

[0080]

[0081] Electrolytic manganese manganese slag leaching solution spiked recovery experiment:

[0082] Take 5 parts of 5 different fresh electrolytic manganese manganese slag leaching solutions, take 10ml of each, add 10ml of Mn content 1000mg / l standard substance to each, place them in 300ml conical flasks, add 50mL of pure water, and shake well; add 10ml of acidifier, the acidifier is 10% sulfuric acid solution (volume concentration); add to 5ml of oxidant, heat and boil for 5min, ensure that the interfering substances and reducing ions in the leachate react completely with the oxidant, the oxidant is KMnO4=0.01mol / L standard solution; add 10ml of reducing agent, heat and boil for 10min, ensure that the unreacted reducing agent is completely decomposed by heating, the reducing agent is 5% sodium bisulfite solution (mass concentration); titrate with oxidant (KMnO4=0.01mol / L standard solution) to light pink as the end point, and calculate the manganese content of the standard substance solution; calculation formula ρMn 2+ =[3×C KMnO4 ×V 滴定 / 2-0.005×C KMnO4 ]×M / V 样 (M is the molecular weight of Mn). The measurement results are shown in Table 3. The recovery rate of the leaching solution in the electrolytic manganese slag is 98.48-101.721%, indicating that the present invention has good accuracy and is accurate and reliable in detecting soluble manganese in the electrolytic manganese slag.

[0083]

[0084]

[0085] In summary, the rapid determination of the water-soluble manganese content in the electrolytic manganese manganese slag provided by the present invention reduces the difficulty, is simple to operate, does not require expensive instruments and equipment, is not interfered by other elements, has a short detection cycle, and the required reagents are non-toxic and harmless. It is completely suitable for industrial detection, and can better and faster realize the rapid determination of the water-soluble manganese content in the electrolytic manganese manganese slag, and effectively monitor the water-soluble manganese content index in the electrolytic manganese manganese slag.

[0086] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for rapidly determining the water-soluble manganese content in electrolytic manganese slag, characterized in that: The following steps are involved: preparing electrolytic manganese manganese slag leaching solution; Add pure water to the leaching solution and stir evenly; Add acidifier to the leaching solution and stir evenly; Add oxidant to the leaching solution, stir evenly, heat to boil and keep for 5 minutes; Add reducing agent to the leaching solution, stir evenly, heat to boil and keep for 10 minutes; The leaching solution is titrated with an oxidizing absorbent, and the total amount of water-soluble manganese in the electrolytic manganese slag is calculated based on the titration volume.

2. The method for rapidly determining the water-soluble manganese content in electrolytic manganese slag according to claim 1, wherein: The preparation of electrolytic manganese manganese slag leaching solution comprises the following steps: Take electrolytic manganese slag, weigh and record its mass; Put the manganese slag into a container, add deionized water, and soak for 20min-60min; Leaching for 1 to 2 hours, stirring continuously for 15 to 30 minutes at the beginning of leaching to ensure that the manganese slag is fully in contact with water and promote dissolution, and then stirring once every 10-15 minutes; the stirring rate is maintained at 100-300 revolutions per minute; Finally, the leachate is separated from the solid residue by filter paper or other suitable filter media, and the filtered leachate is collected.

3. The method for rapidly determining the water-soluble manganese content in electrolytic manganese slag according to claim 1, wherein: The titration volume to calculate the total amount of water-soluble manganese in the electrolytic manganese slag comprises the following steps: To prepare for titration, transfer the prepared leachate into the titration bottle and record its volume; Add indicator, add 1-2 drops of phenolphthalein solution to the leachate to observe the titration endpoint; The titration is carried out by slowly adding potassium permanganate as an oxidizing absorbent to the leachate while slowly stirring until the color changes from colorless to pink, indicating that the titration endpoint has been reached; Record data, record the consumption of oxidation absorbent, i.e. titration volume; Calculate the total amount of water-soluble manganese. Based on the known concentration of the oxidative absorbent and the volume consumed, use the following formula to calculate the water-soluble manganese content: Total amount of water-soluble manganese = concentration of oxidizing absorbent × consumption volume × molar ratio × sample dilution ratio; The results are summarized and the calculation results are recorded to obtain the water-soluble manganese content in the electrolytic manganese slag.

4. The method for rapidly determining the water-soluble manganese content in the electrolytic manganese slag according to any one of claims 1 to 3, characterized in that: The ratio of the electrolytic manganese slag leaching solution, acidifier, oxidant and reducing agent is 2:2:1:

2.

5. The method for rapidly determining the water-soluble manganese content in the electrolytic manganese slag according to any one of claims 1 to 3, characterized in that: The oxidant is a standard solution of KMnO4=0.01 mol / L.

6. The method for rapidly determining the water-soluble manganese content in the electrolytic manganese slag according to any one of claims 1 to 3, characterized in that: The acidifying agent is a sulfuric acid solution.

7. The method for rapidly determining the water-soluble manganese content in the electrolytic manganese slag according to any one of claims 1 to 3, characterized in that: The acidic reducing agent is a sodium bisulfite solution.

8. The method for rapidly determining the water-soluble manganese content in electrolytic manganese slag according to claim 6, wherein: The volume concentration of the sulfuric acid solution is 10%.

9. The method for rapidly determining the water-soluble manganese content in electrolytic manganese slag according to claim 7, wherein: The mass concentration of the sodium bisulfite solution is 5%.

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