Method for extracting manganese in soft manganese ore at room temperature and low acid speed
By using a rapid, low-acid, room-temperature extraction method, the problems of high energy consumption, severe equipment corrosion, and low production efficiency in the manganese extraction process from pyrolusite have been solved. This method achieves low-energy, low-acid, short-time, and high-efficiency manganese extraction, which is suitable for the green and efficient development of the manganese ore extraction industry.
Patent Information
- Application Number
- CN202610334767.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-18
- Publication Date
- 2026-06-05
AI Technical Summary
Existing manganese extraction processes from pyrolusite ore cannot simultaneously meet the requirements of ambient temperature, low acidity, and rapid processing. They suffer from high energy consumption, severe equipment corrosion, low production efficiency, high production costs, and the introduction of numerous impurities, which hinders the green and efficient development of the manganese ore extraction industry.
A rapid extraction method with low acidity at room temperature is adopted, which includes crushing and grinding manganese ore powder, controlling the sulfuric acid concentration at 0.25-2.5 mol/L, the solid-liquid ratio at 1:5-1:10, adding an inorganic reducing agent such as sodium sulfite, reacting at 20-30℃ for 5-10 minutes, and subsequently adding hydrogen peroxide to further improve the extraction rate. The reaction gas is then condensed and reused to achieve rapid leaching.
It significantly reduces energy and acid consumption, shortens reaction time, increases manganese extraction rate, reduces impurity introduction, improves production efficiency and equipment lifespan, and is suitable for use in areas with insufficient energy or high electricity prices. It also reduces production costs, simplifies subsequent purification and impurity removal processes, and reduces waste gas emissions.
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] This invention relates to a rapid, low-acid extraction method for manganese from pyrolusite at room temperature, belonging to the field of mineral hydrometallurgical technology. Background Technology
[0002] Pyrolusite is one of the most abundant manganese resources in nature, and its main chemical component is manganese dioxide (MnO2). In hydrometallurgical industries, the extraction of manganese from pyrolusite typically employs a reduction leaching process because the manganese in MnO2 is in a high valence state (Mn2). 4 Manganese ⁺ has poor solubility in acidic media and must be reduced to divalent manganese (Mn²⁺) before it can effectively enter the solution.
[0003] Traditional reduction leaching processes for pyrolusite mainly fall into two categories: one is the high-temperature roasting reduction-acid leaching process, in which pyrolusite is mixed with a reducing agent and roasted at high temperature (500-800℃) to reduce MnO2 to MnO, followed by leaching with dilute sulfuric acid; the other is the direct reduction leaching process, in which a reducing agent and sulfuric acid are added simultaneously during the leaching process, and the reaction takes place under heating conditions. Both of these traditional processes have significant drawbacks: The first type of roasting-reduction process suffers from problems such as a long process flow, large equipment investment, extremely high energy consumption, and waste gas pollution. While the second type of direct reduction leaching process simplifies the process, it typically still requires high temperature (above 80℃) and high acid (sulfuric acid concentration above 3 mol / L), with reaction times as long as 1-2 hours, to achieve a relatively ideal manganese extraction rate. For example, when using sulfites or sulfides as reducing agents, the reaction temperature usually needs to be maintained at 80-95℃, the sulfuric acid concentration needs to reach 3-5 mol / L, and the reaction time needs to be no less than 60 minutes. These high-temperature, high-acid conditions result in persistently high energy consumption, severe equipment corrosion, large acid consumption, long reaction times, and low production efficiency.
[0004] In recent years, researchers have attempted to develop room-temperature leaching processes to reduce energy consumption. Some literature reports studies on the reduction leaching of pyrolusite at room temperature; however, existing room-temperature processes often have drawbacks: some require maintaining high acid concentrations (above 3 mol / L) to achieve acceptable extraction rates; others, while reducing acid concentrations, require extending reaction times to several hours; still others, although achieving room-temperature low-acidity leaching, result in low extraction rates, making it difficult to meet the requirements of industrial production. For example, some room-temperature processes using organic reducing agents (such as sucrose and starch) typically require 2-4 hours of reaction time, and the introduction of organic matter can lead to a decrease in current efficiency in subsequent electrolysis processes.
[0005] In summary, existing manganese extraction processes from pyrolusite ore cannot simultaneously meet the three core requirements of "room temperature, low acidity, and rapid extraction." They suffer from technical challenges such as high energy consumption, severe equipment corrosion, low production efficiency, high production costs, and the introduction of numerous impurities, thus hindering the green and efficient development of the manganese extraction industry. Therefore, developing a process that can rapidly and efficiently extract manganese under room temperature and low acidity conditions with minimal impurity introduction has significant industrial application value and environmental implications. Summary of the Invention
[0006] This invention addresses the aforementioned shortcomings and defects in existing technologies by providing a rapid, low-acid extraction method for manganese from pyrolusite at room temperature. This method achieves the technical advantages of "low temperature with no energy consumption, low acidity reducing corrosion, and short extraction time increasing efficiency." While ensuring a high manganese extraction rate, it significantly reduces energy and acid consumption, shortens reaction time, and minimizes impurity introduction, thereby comprehensively improving the economic efficiency and environmental friendliness of the manganese extraction process.
[0007] This invention is achieved through the following scheme: a rapid extraction method for manganese from pyrolusite at room temperature with low acidity, characterized by comprising the following steps: Step 1: Raw material pretreatment: The pyrolusite ore is crushed, ground, and sieved to obtain manganese ore powder with a particle size of 80-200 mesh, which is then set aside. Step 2, leaching system preparation: Add sulfuric acid solution to the reaction vessel, then add the manganese ore powder obtained in Step 1. Control the concentration of sulfuric acid solution to 0.25-2.5 mol / L, and control the solid-liquid ratio of manganese ore powder to sulfuric acid solution to 1:5-1:10 (g / mL). Step 3: Adding reducing agent: Add reducing agent to the leaching system of Step 2, and control the mass ratio of reducing agent to manganese ore powder to be 0.13-0.43; Step 4, ambient temperature reaction leaching: Place the reaction system obtained in Step 3 in an ambient temperature environment of 20-30℃ and react for 5-10 minutes under stirring to complete the leaching of manganese; Step 5, solid-liquid separation: After the reaction is completed, the reaction system is separated by filtration or centrifugation to obtain a leachate containing manganese ions, which is the manganese extract.
[0008] As a preferred embodiment of the present invention, the stirring rate in step four is 200-300 r / min.
[0009] In a preferred embodiment of the present invention, the method further includes condensation and gas collection during the reaction process in step four, recycling the gas generated during the reaction back into the reaction system. Specifically, a condenser is connected to the reaction vessel for condensation and reflux of the gas during the reaction, and a gas collection device is connected above the condenser to collect the reducing gas generated during the reaction and allow it to return to the reaction system as a derivative reducing agent to participate in the leaching reaction of pyrolusite.
[0010] As a further preferred embodiment of the present invention, after the reaction in step four has been completed for 5-10 minutes, hydrogen peroxide is added to the reaction system, and the reaction continues for another 5-10 minutes to further improve the extraction rate of manganese. Preferably, the amount of hydrogen peroxide added is 2-4 mL per 10 g of manganese ore powder.
[0011] As a preferred embodiment of the present invention, the reducing agent is an inorganic reducing agent selected from one or more of sodium sulfite, sodium thiosulfate, sodium bisulfite, and sodium sulfide.
[0012] As a preferred embodiment of the present invention, the concentration of the sulfuric acid solution is 1.0-2.5 mol / L.
[0013] As a preferred embodiment of the present invention, the mass ratio of the reducing agent to manganese ore powder is 0.33-0.43.
[0014] As a preferred embodiment of the present invention, the reaction temperature is 25-30℃.
[0015] As a preferred embodiment of the present invention, the reaction time is 5 minutes.
[0016] As a preferred embodiment of the present invention, the method further includes a step of further processing the leachate, including purification and removal of impurities, electrolytic deposition, etc., for the preparation of metallic manganese or manganese salt products.
[0017] The beneficial effects of this invention are as follows: 1. The method of this invention is carried out entirely at a normal temperature of 20-30℃, requiring no external heating equipment and consuming no thermal energy. Compared with traditional high-temperature processes (above 80℃), energy consumption is reduced by more than 60%, significantly reducing production costs, and making it particularly suitable for promotion and application in areas with insufficient energy supply or high electricity prices.
[0018] 2. This invention discloses a rapid, low-acid extraction method for manganese from pyrolusite at room temperature. The sulfuric acid concentration used in this invention is only 0.25-2.5 mol / L, far lower than the 3 mol / L or more used in traditional processes. The lower acid concentration significantly slows down the corrosion of the reaction equipment, extends its service life, and reduces equipment maintenance costs. Simultaneously, the amount of waste acid generated under low-acid conditions is reduced, lowering the cost of subsequent acid neutralization treatment and meeting clean production requirements.
[0019] 3. This invention provides a rapid, low-acid extraction method for manganese from pyrolusite at room temperature. The core reaction time of this method is only 5-10 minutes, compared to 1-2 hours for traditional processes, increasing processing efficiency by more than 10 times. This means that under the same scale of production equipment, production capacity can be increased tenfold, or equipment investment can be significantly reduced to achieve the same production capacity. This is of great significance for improving enterprise capital turnover efficiency and reducing production costs.
[0020] 4. Under preferred conditions, the method of the present invention can achieve a high manganese extraction rate. Example 5 shows that under the conditions of sulfuric acid concentration of 2.5 mol / L, reducing agent ratio of 0.43, and temperature of 30°C, the manganese extraction rate can reach 75.61% after 5 minutes of reaction; extending the reaction time to 40 minutes can increase the extraction rate to 80.9%. When hydrogen peroxide is used for synergistic leaching, the extraction rate can be further increased to 95% (Example 7). This process flexibility allows production enterprises to optimize the choice between reaction time and extraction rate according to actual needs.
[0021] 5. This invention uses an inorganic reducing agent, which, apart from potentially present sodium ions, does not introduce other new metallic impurity elements into the leachate, thus avoiding the organic residue problems that may arise from traditional organic reducing agents. This not only simplifies the subsequent purification and impurity removal processes, but more importantly, it avoids the adverse effects of organic matter on the electrolysis process (such as reduced current efficiency and contamination of cathode products), creating favorable conditions for the subsequent preparation of high-purity metallic manganese or manganese salt products.
[0022] 6. In a preferred embodiment of the present invention, a condensation and gas collection and reuse device is provided, which can collect and recycle the reducing gases (such as SO2, H2S, etc.) generated during the reaction into the reaction system, further participating in the reduction leaching of pyrolusite. This not only improves the utilization rate of the reducing agent and reduces reagent consumption, but also reduces waste gas emissions, resulting in significant environmental benefits. Detailed Implementation
[0023] The present invention will be further described below, but the scope of protection of the present invention is not limited to the content described.
[0024] The pyrolusite ore used in the following examples came from the same batch, and its main chemical composition analysis results were as follows: Mn 32.5%, Fe 8.2%, SiO2 18.6%, Al2O3 5.3%, CaO 1.8%, MgO 1.2%, with the remainder being loss on ignition and trace impurities. The sulfuric acid used was industrial-grade concentrated sulfuric acid diluted and prepared. Sodium sulfite (industrial grade, purity ≥95%) was used as the reducing agent, and industrial-grade hydrogen peroxide (concentration 30%) was used. The manganese extraction rate was determined by ferrous ammonium sulfate titration, with three repeated determinations and the average value taken. Example
[0025] (1) Take soft manganese ore raw material, crush it coarsely with a jaw crusher, grind it with a ball mill, and pass it through a 200-mesh standard sieve to obtain manganese ore powder with a particle size of 200 mesh, and set it aside.
[0026] (2) Add 200 mL of 0.25 mol / L sulfuric acid solution to a 500 mL three-necked flask, and then accurately weigh 20 g of manganese ore powder obtained in step (1) and add it to the three-necked flask. Control the solid-liquid ratio to 1:10 (g / mL) and stir evenly to fully disperse the ore powder.
[0027] (3) Weigh 2.6g of sodium sulfite reducing agent (the mass ratio of reducing agent to manganese ore powder is 0.13) and add it to a three-necked flask.
[0028] (4) Place the three-necked flask in a constant temperature water bath at 20°C, connect the serpentine condenser, and connect the upper end of the condenser to a balloon for gas collection. Turn on the magnetic stirrer, control the stirring speed to 200 r / min, and time the reaction for 5 minutes.
[0029] (5) After the reaction was completed, the mixture was immediately filtered through a Buchner funnel and the filtrate was collected. The filter residue was washed three times with deionized water, and the washings were combined with the filtrate. The concentration of manganese ions in the filtrate was determined by titration with ferrous ammonium sulfate, and the manganese extraction rate was calculated to be 38.5%. Example
[0030] This embodiment is basically the same as Embodiment 1, except that the amount of reducing agent added in step (3) is 5.2g (the mass ratio of reducing agent to manganese ore powder is 0.26). The manganese extraction rate was measured to be 41.2%. Example
[0031] This embodiment is basically the same as Embodiment 1, except that the amount of reducing agent added in step (3) is 6.6g (the mass ratio of reducing agent to manganese ore powder is 0.33). The manganese extraction rate was measured to be 42.0%. Example
[0032] This embodiment is basically the same as Embodiment 1, except that the sulfuric acid concentration in step (2) is adjusted to 0.5 mol / L, and the amount of reducing agent added in step (3) is 6.6 g (the mass ratio of reducing agent to manganese ore powder is 0.33). The manganese extraction rate was measured to be 48.0%. Example
[0033] This embodiment is basically the same as Example 1, except that the sulfuric acid concentration in step (2) is adjusted to 1.0 mol / L, and the amount of reducing agent added in step (3) is 6.6 g (the mass ratio of reducing agent to manganese ore powder is 0.33). A sample was taken after 5 minutes of reaction, and the manganese extraction rate was 49.0%; after continuing the reaction for 20 minutes, another sample was taken, and the manganese extraction rate was 50.6%. Example
[0034] This embodiment is basically the same as Example 1, except that the sulfuric acid concentration in step (2) is adjusted to 2.5 mol / L, the amount of reducing agent added in step (3) is 6.6 g (the mass ratio of reducing agent to manganese ore powder is 0.33), and the constant temperature water bath temperature in step (4) is adjusted to 25℃. The manganese extraction rate was measured to be 60.3% after 5 minutes of reaction. Example
[0035] (1) Take soft manganese ore raw material, crush it coarsely with a jaw crusher, grind it with a ball mill, and pass it through a 100-mesh standard sieve to obtain manganese ore powder with a particle size of 100 mesh, and set it aside.
[0036] (2) Add 100 mL of 2.5 mol / L sulfuric acid solution to a 250 mL three-necked flask, then accurately weigh 10 g of manganese ore powder obtained in step (1) and add it to the three-necked flask. Control the solid-liquid ratio to 1:10 (g / mL) and stir evenly.
[0037] (3) Weigh 4.3g of sodium sulfite reducing agent (the mass ratio of reducing agent to manganese ore powder is 0.43) and add it to a three-necked flask.
[0038] (4) Place the three-necked flask in a constant temperature water bath at 30°C, connect the serpentine condenser, and connect the upper end of the condenser to a balloon. Turn on the magnetic stirrer and control the stirring speed to 100-300 r / min, and start the reaction for 5 minutes.
[0039] (5) After the reaction was completed, the mixture was filtered through a Buchner funnel and the filtrate was collected. The concentration of manganese ions in the filtrate was determined by titration with ferrous ammonium sulfate, and the manganese extraction rate was calculated to be 75.6%. Example
[0040] This embodiment is basically the same as Example 7, except that the reaction time in step (4) is extended to 40 minutes. The manganese extraction rate was measured to be 80.9%. Example
[0041] (1)-(4) are the same as steps (1)-(4) in Example 7, react for 5 minutes.
[0042] (5) Add 2 mL of hydrogen peroxide (30%) to the three-necked flask after the reaction is complete, and continue the reaction for 5 minutes.
[0043] (6) After the reaction was completed, the mixture was filtered through a Buchner funnel and the filtrate was collected. The concentration of manganese ions in the filtrate was determined by titration with ferrous ammonium sulfate, and the manganese extraction rate was calculated to be 89.0%. Example
[0044] (1)-(4) are the same as steps (1)-(4) in Example 7, react for 5 minutes.
[0045] (5) Add 4 mL of hydrogen peroxide (30%) to the three-necked flask after the reaction is complete, and continue the reaction for 5 minutes.
[0046] (6) After the reaction was completed, the mixture was filtered through a Buchner funnel and the filtrate was collected. The concentration of manganese ions in the filtrate was determined by titration with ferrous ammonium sulfate, and the manganese extraction rate was calculated to be 95.0%. Example
[0047] This embodiment examines the effect of different types of reducing agents on the extraction rate.
[0048] (1) Take pyrolusite ore, grind it through a 100-mesh sieve to obtain manganese ore powder for later use.
[0049] (2) Add 100 mL of 2.5 mol / L sulfuric acid solution and 10 g of manganese ore powder to a 250 mL three-necked flask and stir well.
[0050] (3) Different reducing agents were used: 4.3g of sodium thiosulfate in group A, 4.3g of sodium bisulfite in group B, and 4.3g of sodium sulfide in group C were added to three-necked flasks respectively.
[0051] (4) Place the three-necked flask in a 30°C constant temperature water bath and stir for 5 minutes.
[0052] (5) Filtration was performed, and the concentration of manganese ions in the filtrate was measured to calculate the extraction rate. The extraction rate of group A was 74.2%, that of group B was 73.8%, and that of group C was 76.5%. The results showed that different inorganic reducing agents could achieve good extraction effects, with sodium sulfide showing slightly better results. Example
[0053] This embodiment examines the effect of different solid-liquid ratios on the extraction rate.
[0054] (1) Take pyrolusite ore, grind it through a 100-mesh sieve to obtain manganese ore powder for later use.
[0055] (2) Add 2.5 mol / L sulfuric acid solution to the reaction vessel and control the solid-liquid ratio to 1:5, 1:7.5 and 1:10 (g / mL), respectively, that is, add 10g manganese ore powder and 50mL, 75mL and 100mL sulfuric acid solution respectively.
[0056] (3) Add 4.3g of sodium sulfite reducing agent to each.
[0057] (4) Place it in a 30°C constant temperature water bath and stir for 5 minutes.
[0058] (5) Filtration was performed, and the concentration of manganese ions in the filtrate was measured to calculate the extraction rate. The extraction rate was 70.2% when the solid-liquid ratio was 1:5, 73.5% when it was 1:7.5, and 75.6% when it was 1:10. The results show that appropriately increasing the liquid-solid ratio is beneficial to improving the extraction rate.
[0059] (1) Take 10g (100 mesh) of pyrolusite powder from the same batch and add 100mL of 3.5mol / L sulfuric acid solution.
[0060] (2) Add 4.3g of sodium sulfite reducing agent.
[0061] (3) Place the reaction system in a 90°C constant temperature water bath and stir for 2 hours.
[0062] (4) Filtration, determination of manganese ion concentration in filtrate, and calculation of manganese extraction rate of 86.3%.
[0063] Although this process achieved a high extraction rate (86.3%), it required a high reaction temperature (90℃), a long reaction time (2 hours), extremely high energy consumption, severe equipment corrosion, and high production costs.
[0064] (1) Take 10g (100 mesh) of pyrolusite powder from the same batch and add 100mL of 4.0mol / L sulfuric acid solution.
[0065] (2) Add 4.3g of sodium sulfite reducing agent.
[0066] (3) Place the reaction system in a 30°C constant temperature water bath and stir for 5 minutes.
[0067] (4) Filtration, determination of manganese ion concentration in filtrate, and calculation of manganese extraction rate of 62.5%.
[0068] Although this process achieves rapid reaction at room temperature, it requires a high acid concentration (4.0 mol / L), and the extraction rate (62.5%) is lower than the 75.6% under the preferred conditions of this invention, resulting in high acid consumption and high subsequent processing costs.
[0069] (1) Take 10g (100 mesh) of pyrolusite powder from the same batch and add 100mL of 1.0mol / L sulfuric acid solution.
[0070] (2) Add 4.3g of sodium sulfite reducing agent.
[0071] (3) Place the reaction system in a 30°C constant temperature water bath and stir for 4 hours.
[0072] (4) Filtration, determination of manganese ion concentration in filtrate, and calculation of manganese extraction rate of 68.7%.
[0073] Although this process achieves low acidity and room temperature, the reaction time is as long as 4 hours, resulting in extremely low production efficiency and failing to meet the requirements of industrial production.
[0074] (1) Take 10g (100 mesh) of the same batch of pyrolusite powder and add 100mL of 2.5mol / L sulfuric acid solution.
[0075] (2) Add 4.3g of sucrose (organic reducing agent).
[0076] (3) Place the reaction system in a 30°C constant temperature water bath and stir for 5 minutes.
[0077] (4) Filtration, determination of manganese ion concentration in filtrate, and calculation of manganese extraction rate of 42.3%.
[0078] The extraction rate of this process is much lower than the 75.6% achieved by using an inorganic reducing agent in this invention. Further electrolysis tests on the leachate revealed that the electrolysis current efficiency decreased by approximately 15% due to the presence of organic matter, and the purity of the cathode product also decreased.
[0079] Summary and Analysis of Example Data The main parameters and results of the above embodiments and comparative examples are summarized in Table 1.
[0080] Table 1 Summary of main parameters and extraction rates for each embodiment and comparative example
[0081] To verify the industrial feasibility of the method of the present invention, a large-scale test was conducted on a production line with an annual output of 5,000 tons of electrolytic manganese: (1) Take soft manganese ore, process it with a jaw crusher and a ball mill to obtain manganese ore powder with a mesh size of 100 or more (85%).
[0082] (2) In a 5m³ titanium-lined reactor, add 3m³ of 2.5mol / L sulfuric acid solution and 300kg of manganese ore powder, and stir until homogeneous.
[0083] (3) Add 129 kg of sodium sulfite (reducing agent to ore ratio 0.43) and start stirring.
[0084] (4) React for 8 minutes at an ambient temperature of 28-32℃ (the time may be extended appropriately to consider the mass transfer efficiency on an industrial scale).
[0085] (5) After the reaction is complete, the solution is pumped into a filter press for solid-liquid separation to obtain leachate.
[0086] (6) After neutralization and purification, the leachate is sent to an electrolytic cell for electrolytic deposition to obtain metallic manganese products.
[0087] The manganese leaching rate was measured to be 74.8%, which is close to the results of the laboratory pilot test. The current efficiency of the electrolysis process was 68%, and the product quality met the requirements of YB / T 051-2015 standard. Compared with the original high-temperature process, the power consumption per ton of manganese was reduced by 320 kWh, sulfuric acid consumption was reduced by 35%, and production efficiency was increased by 6 times.
[0088] This invention's method is applicable not only to processing pyrolusite ore but also to processing various manganese oxide ores, manganese-silver ores, manganese-cobalt ores, and other composite ores, as well as various manganese smelting intermediates. The method has advantages such as simple process, low equipment investment, convenient operation, and ease of automation. It can be promoted and applied in newly built manganese smelting enterprises and can also be used for the technical transformation of existing high-temperature, high-acid process production lines, demonstrating good industrial applicability and promising prospects for widespread application.
[0089] Based on the comparative analysis of the above embodiments, the optimal implementation of the present invention is as follows: Take pyrolusite, crush and grind it to 100 mesh, add 2.5 mol / L sulfuric acid solution, control the solid-liquid ratio at 1:10, add sodium sulfite reducing agent (reducing agent to ore mass ratio 0.43), stir and react at 30℃ for 5 minutes, then add 4 mL / 10 g of hydrogen peroxide (30%), continue the reaction for 5 minutes, and filter to obtain the leachate. This method can achieve a manganese extraction rate of over 95% within 10 minutes, realizing the technical effect of room temperature, low acidity, rapid and efficient manganese extraction.
[0090] Although the technical solutions of the present invention have been described and enumerated in detail, it should be understood that modifications to the above embodiments or the adoption of equivalent alternatives are obvious to those skilled in the art. Such modifications or improvements made without departing from the spirit of the present invention are all within the scope of protection claimed by the present invention.
Claims
1. A rapid, low-acid extraction method for manganese from pyrolusite at room temperature, characterized in that, Includes the following steps: Step 1: Crush and grind the pyrolusite to a particle size of 80-200 mesh to obtain manganese ore powder; Step 2: Add sulfuric acid solution and manganese ore powder obtained in Step 1 to the reaction vessel, controlling the sulfuric acid concentration to be 0.25-2.5 mol / L, and the solid-liquid ratio of manganese ore powder to sulfuric acid solution to be 1:5-1:10 g / mL; Step 3: Add a reducing agent to the leaching system of Step 2, and control the mass ratio of the reducing agent to the manganese ore powder to be 0.13-0.43; Step 4: Place the reaction vessel in a room temperature environment of 20~30℃ and stir for 5-10 minutes to complete the leaching of manganese; Step 5: After the reaction is complete, the solid and liquid are separated to obtain a leachate containing manganese ions.
2. The method for rapid extraction of manganese from pyrolusite at room temperature under low acidity according to claim 1, characterized in that, The stirring rate in step four is 200-300 r / min.
3. The method according to claim 1, characterized in that, In step four, the reaction system is condensed and the gas is collected, and the gas produced by the reaction is recycled back into the reaction system.
4. The method according to claim 1, characterized in that, After the reaction has been completed for 5-10 minutes in step four, add hydrogen peroxide to the reaction system and continue the reaction for another 5-10 minutes.
5. The method according to claim 4, characterized in that, The amount of hydrogen peroxide added is 2-4 mL per 10 g of manganese ore powder.
6. The method according to claim 1, characterized in that, The reducing agent is an inorganic reducing agent, selected from one or more of sodium sulfite, sodium thiosulfate, sodium bisulfite, and sodium sulfide.
7. The method according to claim 1, characterized in that, The concentration of the sulfuric acid solution is 1.0-2.5 mol / L.
8. The method according to claim 1, characterized in that, The mass ratio of the reducing agent to manganese ore powder is 0.33-0.
43.
9. The method according to claim 1, characterized in that, The reaction temperature is 25-30℃.
10. The method according to claim 1, characterized in that, The reaction time is 5 minutes.