Device for reducing manganese loss through segmented leaching

Abstract

The utility model discloses a device for reducing manganese loss through segmented leaching, and belongs to the technical field of manganese purification. The utility model discloses a device for reducing manganese loss through segmented leaching. The device comprises a first reaction mechanism, a first filter press, a second reaction mechanism, a second filter press, a third reaction mechanism, a third filter press and a leachate tank which are sequentially connected in series, the first filter press, the second filter press and the third filter press are respectively used for receiving products discharged by the first reaction mechanism, the second reaction mechanism and the third reaction mechanism and separating to obtain leaching residues and leaching liquid, and the first-section leaching residues separated by the first filter press in the first reaction mechanism are calcium sulfate and SiO2; the first-section leachate is conveyed to the second reaction mechanism by the first filter press; the second-section leaching residue separated by the second filter press in the second reaction mechanism is ferric hydroxide, and the second-section leaching liquid is conveyed to a third reaction mechanism by the second filter press; and the leaching liquid output by the third filter press is manganese-rich liquid and is conveyed to the leaching liquid tank.

Description

Technical Field

[0001] The utility model belongs to the technical field of manganese purification, and more specifically relates to a device for reducing manganese loss by staged leaching. Background Art

[0002] Manganese is a grayish-white, hard, brittle, and lustrous transition metal. In the steel industry, it is mainly used for the desulfurization and deoxidation of steel. It is also used as an alloy additive to improve the alloy's strength, hardness, elastic limit, wear resistance, and corrosion resistance. Manganese can also be used in the manufacture of organic catalysts, dyes, and pigments, as well as in the pharmaceutical and dry cell fields. In addition, manganese can be used as a trace element additive, providing manganese in feed or fertilizer to promote the growth and health of animals or plants.

[0003] Manganese leaching is a method for extracting manganese. Its principle is to dissolve the manganese ions in the manganese ore through the leaching agent, and then obtain metallic manganese through the steps of reduction, precipitation, smelting, etc. The existing manganese purification scheme is to gradually add concentrated sulfuric acid to the manganese raw material in the reaction tank and react under certain conditions for 4-8 hours. After the reaction is basically completed, the manganese raw material is added to neutralize the leachate to pH 3.0-4.0, and then H2O2 is added to Fe 2+ Oxidized to Fe 3+ Finally, add alkali solution until the pH of the leaching solution reaches above 5.0. At this time, Fe 3+ The hydrolysis and precipitation process also involves the hydrolysis and precipitation of most heavy metal ions. Most of the impurity SiO2 is precipitated together with Fe(OH)3 into the leaching residue, which is then outsourced for processing or sold to building material manufacturers such as cement plants and steel mills after calcination and drying. However, this solution results in a higher manganese content in the leaching residue due to the higher final pH during the leaching process, increasing the manganese loss rate and production costs.

[0004] Therefore, we need a device that can leaching manganese in sections, improve the utilization rate of raw materials, and use different pH values ​​at different stages to achieve the precipitation and dissolution balance of different metal ions, thereby increasing the yield of manganese. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a device for reducing manganese loss by staged leaching. By dividing the manganese leaching process into stages, different pH values ​​can be used at different stages to achieve the precipitation and dissolution balance of different metal ions, and calcium, silicon, iron and other heavy metals can be leached in stages. At the same time, the leaching residues from the three stages are returned to the first and second stages for leaching reactions, thereby improving the manganese yield and reducing the production cost of pH adjustment. The leaching residues from the first and second stages are dried for sale, thereby achieving better production efficiency.

[0006] The utility model discloses a device for reducing manganese loss by staged leaching, which comprises a first reaction mechanism, a first filter press, a second reaction mechanism, a second filter press, a third reaction mechanism, a third filter press and a leachate tank, which are sequentially connected in series; the first filter press, the second filter press and the third filter press are respectively used to receive the discharge products of the first reaction mechanism, the second reaction mechanism and the third reaction mechanism and separate them into leaching residue and leachate; the leachate output by the third filter press is a manganese-rich liquid and is transported to the leachate tank.

[0007] The first reaction mechanism includes a first reaction tank, a first feed port and a first discharge port. The first feed port is arranged at the top of the first reaction tank for feeding manganese raw material and concentrated sulfuric acid. The first discharge port is arranged at the bottom of the first reaction tank and is connected to the first filter press pipeline, so that a section of leaching residue obtained by the reaction of the first reaction mechanism is separated by the first filter press to obtain calcium sulfate and SiO2, and a section of leachate obtained by the reaction is transported to the second reaction mechanism by the first filter press.

[0008] The second reaction mechanism includes a second reaction tank, a second feed port and a second discharge port. The second feed port is arranged at the top of the second reaction tank and is used to feed the first-stage leachate and H2O2 separated by the first filter press. The second discharge port is arranged at the bottom of the second reaction tank and is connected to the pipeline of the second filter press, so that the second-stage leaching residue obtained by the reaction of the second reaction mechanism is separated by the second filter press to obtain iron hydroxide, and the second-stage leachate obtained by the reaction is transported to the third reaction mechanism by the second filter press.

[0009] The third reaction mechanism includes a third reaction tank, a third feed port and a third discharge port. The third feed port is arranged at the top of the third reaction tank and is used to feed the two-stage leachate and alkali solution separated by the second filter press. The third discharge port is arranged at the bottom of the third reaction tank and is connected to the pipeline of the third filter press, so that the three-stage leaching residue obtained by the reaction of the third reaction mechanism is separated by the third filter press, and the three-stage leachate obtained by the reaction is transported to the leachate tank by the third filter press as manganese-rich liquid.

[0010] As a further improvement of the present invention, the first reaction mechanism also includes a first agitator, a first output pump and a first reflux port; the first reflux port is arranged next to the first feed port, for receiving the leached residue separated by the third filter press; the first agitator is arranged inside the first reaction tank, for stirring the manganese raw material, the separated three-stage leaching residue and the concentrated sulfuric acid to fully react, thereby avoiding the waste of manganese in the three-stage leaching residue due to incomplete leaching; the first output pump is located between the first discharge port and the first filter press, for conveying the reaction product of the first reaction tank to the first filter press.

[0011] As a further improvement of the present invention, the second reaction mechanism also includes a second agitator, a second output pump and a second reflux port; the second reflux port is arranged next to the second feed port, for receiving the leached residue separated by the third filter press; the second agitator is arranged inside the second reaction tank, for stirring the first stage of leachate, the separated leached residue and H2O2 to fully react, thereby avoiding the waste of manganese in the three-stage leaching residue due to incomplete leaching; the second output pump is located between the second discharge port and the second filter press, for conveying the product after the reaction in the second reaction tank to the second filter press.

[0012] As a further improvement of the present invention, the third reaction mechanism also includes a third agitator and a third output pump. The third agitator is arranged inside the third reaction tank for stirring the second-stage leachate and the alkali solution for sufficient reaction; the third output pump is located between the third discharge port and the third filter press for transporting the reaction product of the third reaction tank to the third filter press.

[0013] As a further improvement of the present invention, it also includes a slurry mixing mechanism, which includes a slurry mixing tank, an inlet, an outlet and a reflux device. The inlet is arranged at the top of the slurry mixing tank, for receiving water and the three-stage leaching residue discharged from the third filter press; the slurry mixing tank is used to mix the leaching residue and water into slurry; the outlet is arranged at the bottom of the slurry mixing tank, and the reflux device is connected to the pipeline at the outlet, for transferring the leaching residue slurry liquid to the first reaction mechanism and the second reaction mechanism, thereby avoiding the waste of manganese in the three-stage leaching residue due to incomplete leaching.

[0014] As a further improvement of the present invention, the reflux device includes a reflux pump 1, a reflux pump 2 and a control valve group. The reflux pump 1 and the reflux pump 2 are arranged in parallel, and the reflux pump 1 and the reflux pump 2 correspond to the first reaction mechanism and the second reaction mechanism respectively; the control valve groups are respectively arranged on the parallel pipes where the reflux pump 1 and the reflux pump 2 are located, and are used to adjust the amount of leached residue distributed to the first reaction mechanism and the second reaction mechanism, thereby adjusting the pH of the system in the first reaction mechanism and the second reaction mechanism, so that the pH of the system in the first reaction mechanism is 1.0-1.5, and the pH of the system in the second reaction mechanism is 2.5-3.0, so that manganese will not form precipitation in the first reaction mechanism and the second reaction mechanism due to the excessively high pH value.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: by arranging the first reaction mechanism, the second reaction mechanism and the third reaction mechanism in sections to leach the manganese raw material, each section of the reaction mechanism can independently adjust the pH and reactants, optimize the precipitation and dissolution of different metal ions, and perform solid-liquid separation after each section of leaching, which can reduce the complexity and cost of subsequent treatment, while improving the purity of the leachate, providing a purer raw material for the next step, thereby increasing the leaching rate of manganese and reducing the loss of manganese; by setting a slurry adjustment mechanism to slurry the three-section leaching residue discharged from the third reaction mechanism The slurry of the three-stage leaching residue is respectively transported to the first reaction mechanism and the second reaction mechanism by arranging a first reflux pump and a second reflux pump, thereby adjusting the pH of the system in the first reaction mechanism and the second reaction mechanism by adjusting the amount of leaching residue distributed to the first reaction mechanism and the second reaction mechanism through the control valve group, thereby avoiding a high pH value in the manganese leaching process, resulting in a high manganese content in the leaching residue and an increased manganese loss rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 This is a schematic structural diagram of the first reaction mechanism of the present invention;

[0018] Figure 3 This is a schematic structural diagram of the second reaction mechanism of the present invention;

[0019] Figure 4 This is a schematic structural diagram of the third reaction mechanism of the present utility model;

[0020] Figure 5 It is a structural schematic diagram of the slurry mixing mechanism of the utility model.

[0021] Description of the numbers in the figure:

[0022] 1 first reaction mechanism, 11 first reaction tank, 12 first feed port, 13 first discharge port, 14 first agitator, 15 first output pump, 16 first reflux port, 2 first filter press, 3 second reaction mechanism, 31 second reaction tank, 32 second feed port, 33 second discharge port, 34 second agitator, 35 second output pump, 36 second reflux port, 4 second filter press, 5 third reaction mechanism, 51 third reaction tank, 52 third feed port, 53 third discharge port, 54 third agitator, 55 third output pump, 6 third filter press, 7 leachate tank, 8 slurry mixing mechanism, 81 slurry mixing tank, 82 inlet, 83 outlet, 84 reflux device, 841 reflux pump 1, 842 reflux pump 2, 843 control valve group. DETAILED DESCRIPTION

[0023] Specific embodiment 1: Please refer to Figure 1-Figure 5 A device for reducing manganese loss by staged leaching comprises a first reaction mechanism 1, a first filter press 2, a second reaction mechanism 3, a second filter press 4, a third reaction mechanism 5, a third filter press 6 and a leachate tank 7 connected in series in sequence; the first filter press 2, the second filter press 4 and the third filter press 6 are respectively used to receive the discharge products of the first reaction mechanism 1, the second reaction mechanism 3 and the third reaction mechanism 5 and separate them into leaching residue and leachate; the leachate output by the third filter press 6 is a manganese-rich liquid and is transported to the leachate tank 7 for subsequent extraction of high-purity manganese.

[0024] like Figure 2 The first reaction mechanism 1 shown includes a first reaction tank 11, a first feed port 12 and a first discharge port 13. The first feed port 12 is arranged at the top of the first reaction tank 11, and is used to add manganese raw material and concentrated sulfuric acid with a concentration greater than 95% and react in the first reaction tank 11 for 4-8 hours. The first discharge port 13 is arranged at the bottom of the first reaction tank 11 and is connected to the first filter press 2 through a pipeline, so that the product obtained by the reaction of the first reaction mechanism 1 is separated by the first filter press 2 to obtain calcium sulfate and SiO2, which are sold to cement plants and other building materials manufacturers after calcination and drying, thereby increasing the efficiency of the production process; the leachate obtained by the reaction is transported to the second reaction mechanism 3 by the first filter press 2 for further separation of impurities in the manganese raw material.

[0025] like Figure 3 The second reaction mechanism 3 shown in FIG. 3 includes a second reaction tank 31, a second feed port 32 and a second discharge port 33. The second feed port 32 is provided at the top of the second reaction tank 31 for feeding a section of leachate separated by the first filter press 2 and H2O2. The Fe 2+ Oxidized to Fe 3+ The second discharge port 33 is provided at the bottom of the second reaction tank 31 and is connected to the second filter press 4 through a pipeline, so that the product obtained by the reaction of the second reaction mechanism 3 is separated by the second filter press 4 to obtain ferric hydroxide, which is then sold to steel mills and other building materials manufacturers after calcination and drying. The second-stage leaching liquid obtained by the reaction is transported by the second filter press 4 to the third reaction mechanism 5 for further separation of heavy metal impurities in the manganese raw material.

[0026] like Figure 4The third reaction mechanism 5 shown includes a third reaction tank 51, a third feed port 52 and a third discharge port 53. The third feed port 52 is arranged at the top of the third reaction tank 51 and is used to feed the two-stage leachate and alkali solution separated by the second filter press 4. The alkali solution is used to increase the pH in the system to above 5, thereby precipitating heavy metal elements. After separation by the third filter press 6, three-stage leaching residue is obtained, wherein the solid content of the three-stage leaching residue is 15%-40%; the third discharge port 53 is arranged at the bottom of the third reaction tank 51 and is connected to the third filter press 6 through a pipeline, so that the three-stage leaching residue obtained by the reaction of the third reaction mechanism 5 is separated by the third filter press 6, and the three-stage leaching liquid obtained by the reaction is transported to the leachate tank 7 by the third filter press 6 as a manganese-rich liquid, as a raw material for subsequent high-purity manganese extraction.

[0027] Specifically, the first reaction mechanism 1 also includes a first agitator 14, a first output pump 15 and a first reflux port 16; the first reflux port 16 is arranged next to the first feed port 12, and is used to receive the leached residue separated by the third filter press 6; the first agitator 14 is arranged inside the first reaction tank 11, and is used to stir the manganese raw material, the separated three-stage leaching residue and the concentrated sulfuric acid to fully react, thereby avoiding the waste of manganese in the three-stage leaching residue due to incomplete leaching; the first output pump 15 is located between the first discharge port 13 and the first filter press 2, and is used to transport the reaction product of the first reaction tank 11 to the first filter press 2.

[0028] Specifically, the second reaction mechanism 3 also includes a second agitator 34, a second output pump 35 and a second reflux port 36; the second reflux port 36 is arranged next to the second feed port 32, and is used to receive the leached residue separated by the third filter press 6; the second agitator 34 is arranged inside the second reaction tank 31, and is used to stir a section of leachate, the separated leached residue and H2O2 to fully react, thereby avoiding the waste of manganese in the three-section leached residue due to incomplete leaching; the second output pump 35 is located between the second discharge port 33 and the second filter press 4, and is used to transport the product after the reaction in the second reaction tank 31 to the second filter press 4.

[0029] Specifically, the third reaction mechanism 5 also includes a third agitator 54 and a third output pump 55. The third agitator 54 is arranged inside the third reaction tank 51, and is used to stir the second-stage leachate and the alkali solution for sufficient reaction; the third output pump 55 is located between the third discharge port 53 and the third filter press 6, and is used to transport the reaction product of the third reaction tank 51 to the third filter press 6.

[0030] Specifically, such as Figure 5The figure also includes a slurry mixing mechanism 8, which includes a slurry mixing tank 81, an inlet 82, an outlet 83 and a reflux device 84. The inlet 82 is arranged at the top of the slurry mixing tank 81, for receiving water and the three-stage leaching residue discharged from the third filter press; the slurry mixing tank 81 can mix the leaching residue and water into slurry; the outlet 83 is arranged at the bottom of the slurry mixing tank 81, and the reflux device 84 is connected to the pipeline at the outlet 83, for transferring the leaching residue slurry liquid to the first reaction mechanism 1 and the second reaction mechanism 3, thereby avoiding the waste of manganese in the three-stage leaching residue due to incomplete leaching.

[0031] Specifically, the reflux device 84 includes a reflux pump 1 841, a reflux pump 2 842 and a control valve group 843. The reflux pump 1 841 and the reflux pump 2 842 are arranged in parallel, and the reflux pump 1 841 and the reflux pump 2 842 correspond to the first reaction mechanism 1 and the second reaction mechanism 3 respectively; the control valve group 843 is respectively arranged on the parallel pipeline where the reflux pump 1 841 and the reflux pump 2 843 are located, and is used to adjust the amount of leached residue distributed to the first reaction mechanism 1 and the second reaction mechanism 3, thereby adjusting the pH of the system in the first reaction mechanism 1 and the second reaction mechanism 3, so that the pH of the system in the first reaction mechanism 1 is 1.0-1.5, and the pH of the system in the second reaction mechanism 3 is 2.5-3.0, so that manganese will not form precipitation in the first reaction mechanism 1 and the second reaction mechanism 3 due to excessively high pH value.

[0032] During use, the manganese raw material is fed into the first reaction tank 11 from the first feed port 12, and then concentrated sulfuric acid is added to the first reaction tank 11 and reacted for 4-8 hours. After that, the pH of the system is adjusted to between 1.0 and 1.5. The medium in the system is then transported to the first filter press 2 through the first output pump 15 for solid-liquid separation to obtain a leachate and a leach residue. The leach residue is mainly composed of calcium sulfate and SiO2, which is sold to building material manufacturers such as cement plants or steel mills after calcination and drying. The leachate is transported from the second feed port 32 to the second reaction tank 31. H2O2 is added from the second feed port 32 to the second reaction tank 31 to make Fe 2+ Oxidized to Fe 3+, adjust the pH of the system to between 2.5 and 3.0, and then transport the medium in the system to the second filter press 4 through the second output pump 35 for solid-liquid separation to obtain the second stage leachate and the second stage leach residue; the second stage leach residue is mainly composed of ferric hydroxide, which is sold to steel mills and other building materials manufacturers after calcination and drying. The second stage leachate is transported from the third feed port 52 to the third reaction tank 51; alkali solution is added to the third reaction tank 51 from the third feed port 52 to adjust the pH of the system to above 5.0, and then the medium in the system is transported to the third filter press 6 through the third output pump 55 for solid-liquid separation to obtain the third stage leachate and the third stage leach residue; the third stage leachate is transported to the leachate tank 7 The next step of purification is carried out to obtain high-purity manganese. The three-stage leaching slag is transported from the inlet 82 to the inside of the slurry mixing tank 81, mixed with water to obtain the three-stage leaching slag slurry liquid, and is controlled by the control valve group 843 of the reflux device 84. The reflux pump 1 841 and the reflux pump 2 842 are respectively transported to the first reflux port 16 of the corresponding first reaction mechanism 1 and the second reflux port 36 of the second reaction mechanism 3. This not only improves the manganese yield in the manganese recovery process, but also can adjust the pH inside the first reaction mechanism 1 and the second reaction mechanism 3 through the three-stage leaching slag slurry liquid, avoiding the loss of manganese caused by precipitation due to the excessively high pH of the reaction system, thereby reducing production costs.

[0033] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed in the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A device for reducing manganese loss by staged leaching, characterized in that: The invention comprises a first reaction mechanism (1), a first filter press (2), a second reaction mechanism (3), a second filter press (4), a third reaction mechanism (5), a third filter press (6) and a leachate tank (7) which are sequentially connected in series; the first filter press (2), the second filter press (4) and the third filter press (6) are respectively used to receive the discharge products of the first reaction mechanism (1), the second reaction mechanism (3) and the third reaction mechanism (5) and separate them into leachate residue and leachate; the leachate produced by the third filter press (6) is transported to the leachate tank (7); The first reaction mechanism (1) comprises a first reaction tank (11), a first feed port (12) and a first discharge port (13), wherein the first feed port (12) is arranged at the top of the first reaction tank (11) and is used to feed manganese raw material and concentrated sulfuric acid, and the first discharge port (13) is arranged at the bottom of the first reaction tank (11) and is connected to the first filter press (2) through a pipeline; The second reaction mechanism (3) comprises a second reaction tank (31), a second feed port (32) and a second discharge port (33), wherein the second feed port (32) is arranged at the top of the second reaction tank (31) and is used to feed a section of leachate separated by the first filter press (2) and H2O2, and the second discharge port (33) is arranged at the bottom of the second reaction tank (31) and is connected to the second filter press (4) via a pipeline; The third reaction mechanism (5) comprises a third reaction tank (51), a third feed port (52) and a third discharge port (53). The third feed port (52) is arranged at the top of the third reaction tank (51) and is used to feed the second-stage leachate and alkali solution separated by the second filter press (4). The third discharge port (53) is arranged at the bottom of the third reaction tank (51) and is connected to the pipeline of the third filter press (6).

2. The device for reducing manganese loss by staged leaching according to claim 1, characterized in that: The first reaction mechanism (1) further comprises a first stirrer (14), a first output pump (15) and a first reflux port (16); the first reflux port (16) is arranged beside the first feed port (12) and is used to receive the leached residue separated by the third filter press (6); the first stirrer (14) is arranged inside the first reaction tank (11) and is used to stir the manganese raw material, the separated leached residue and the concentrated sulfuric acid to fully react; the first output pump (15) is located between the first discharge port (13) and the first filter press (2) and is used to transport the reaction product of the first reaction tank (11) to the first filter press (2).

3. The device for reducing manganese loss by staged leaching according to claim 1, characterized in that: The second reaction mechanism (3) further comprises a second stirrer (34), a second output pump (35) and a second reflux port (36); the second reflux port (36) is arranged beside the second feed port (32) and is used to receive the leached residue separated by the third filter press (6); the second stirrer (34) is arranged inside the second reaction tank (31) and is used to stir a section of leaching liquid, the separated leached residue and H2O2 to fully react; the second output pump (35) is located between the second discharge port (33) and the second filter press (4) and is used to transport the product after the reaction in the second reaction tank (31) to the second filter press (4).

4. The device for reducing manganese loss by staged leaching according to claim 1, characterized in that: The third reaction mechanism (5) further comprises a third stirrer (54) and a third output pump (55). The third stirrer (54) is arranged inside the third reaction tank (51) and is used to stir the second-stage leachate and the alkali solution for sufficient reaction. The third output pump (55) is located between the third discharge port (53) and the third filter press (6) and is used to transport the reaction product of the third reaction tank (51) to the third filter press (6).

5. The device for reducing manganese loss by staged leaching according to claim 1, characterized in that: The invention also includes a slurry mixing mechanism (8), which includes a slurry mixing tank (81), an inlet (82), an outlet (83) and a reflux device (84). The inlet (82) is arranged at the top of the slurry mixing tank (81) and is used to receive water and three-stage leaching residue discharged from the third filter press (6); the slurry mixing tank (81) is used to mix the leaching residue and water into slurry; the outlet (83) is arranged at the bottom of the slurry mixing tank (81); the reflux device (84) is connected to a pipeline at the outlet (83) and is used to transfer the leaching residue slurry liquid to the first reaction mechanism (1) and the second reaction mechanism (3).

6. The device for reducing manganese loss by staged leaching according to claim 5, characterized in that: The reflux device (84) comprises a reflux pump 1 (841), a reflux pump 2 (842) and a control valve group (843). The reflux pump 1 (841) and the reflux pump 2 (842) are arranged in parallel. The reflux pump 1 (841) and the reflux pump 2 (842) correspond to the first reaction mechanism (1) and the second reaction mechanism (3) respectively. The control valve group (843) is respectively arranged on the parallel pipelines where the reflux pump 1 (841) and the reflux pump 2 (842) are located, and is used to adjust the amount of leached residue distributed to the first reaction mechanism (1) and the second reaction mechanism (3) so as to adjust the pH of the system in the first reaction mechanism (1) and the second reaction mechanism (3).

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