Method for washing, enriching and recovering manganese ammonia ions in electrolytic manganese chemical combination slurry by combining CCD-FCDI

Abstract

The invention provides a method for washing, enriching and recycling manganese ammonia ions in electrolytic manganese chemical combination slurry by combining CCD-FCDI, the electrolytic manganese chemical combination slurry is treated by combining a multistage countercurrent washing device and an FCDI device, water-soluble ions such as manganese, ammonium and the like are promoted to enter a liquid phase and are effectively separated from a slag phase, and finally two products are obtained, one is low-ammonia low-manganese recyclable concentrated waste slag, and the other is low-ammonia low-manganese recyclable concentrated waste slag. One is electrolytic manganese qualified liquid. The method aims at solving the problem that electrolytic manganese residues formed through a conventional process are difficult to treat subsequently and be made into materials due to the high manganese ammonium content. And then manganese and ammonium ions are enriched through a flowing electrode capacitor, so that the concentration of the manganese and ammonium ions meets the production requirements of electrolytic manganese qualified liquid. According to the process for preparing the electrolytic manganese qualified liquid, the preparation efficiency is improved, the production cost is reduced, meanwhile, the concentration of manganese and ammonium ions in the waste residues is reduced, and harmless and resourceful treatment of the waste residues is facilitated. The multi-stage countercurrent washing-flowing electrode capacitor combined device has the characteristics of greenness, high efficiency and energy conservation.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolytic manganese production, and specifically relates to a method for washing and enriching and recovering manganese-ammonium ions in an electrolytic manganese chemical slurry by using a multi-stage countercurrent water washing combined with a flow-through electrode capacitive device. Background Art

[0002] The solid content in the chemical slurry during the electrolytic manganese production process is about 20%. The slurry has characteristics such as turbid liquid, fine particles, and complex composition, making it difficult to remove impurities and filter and clarify.

[0003] The current electrolytic manganese production process is as follows. The manganese ore is ground into ore powder by a grinding equipment. The ore powder, sulfuric acid, manganese dioxide powder, ammonia water, and sodium dimethyldithiocarbamate are gradually added into a chemical reaction tank to form a chemical slurry. The chemical slurry becomes a qualified electrolytic manganese solution after three-stage pressure filtration. In this process, the ammonia concentration in the electrolytic manganese slag generated by pressure filtration is high, increasing the difficulty of its harmless treatment and resource utilization. The high energy consumption generated during washing at the pressure filtration end is also a major problem. Therefore, these two problems have become bottlenecks in the development and progress of the electrolytic manganese industry.

[0004] The traditional electrolytic manganese production process often simply treats the waste residue after production and stores it in a slag yard, which not only reduces the resource utilization rate, but also occupies a large amount of land, and may cause serious pollution to the surrounding soil and water environment. Therefore, this also brings many difficulties to electrolytic manganese production and subsequent waste utilization. Summary of the Invention

[0005] The object of the present invention is to provide a method for washing and enriching and recovering manganese-ammonium ions in an electrolytic manganese chemical slurry by combining CCD-FCDI, and using a multi-stage countercurrent water washing combined with a flow-through electrode capacitive device to wash and enrich and recover manganese-ammonium ions in the electrolytic manganese chemical slurry. The present invention combines process control means to reduce the cost in the production process and reduce the retention amount of manganese and ammonium ions in the waste residue.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A method for washing and enriching and recovering manganese-ammonium ions in electrolytic manganese chemical slurry by combining CCD-FCDI, which is characterized in that the chemical slurry of the CCD device enters the bottom of the third thickener to form the third chemical slurry in the order of the first mixing tank, the first thickener, the first mixing tank, the second mixing tank, the second thickener, the second mixing tank, the third mixing tank, and the third thickener from the feed pipe; clear water enters the third mixing tank from the clear water pipe to wash and scrub the third chemical slurry. The overflow liquid of the third thickener enters the second mixing tank through the third mixing tank, and then enters the bottom of the first thickener in the order of the second thickener, the second mixing tank, and the first mixing tank; when the first thickener is full, the first overflow liquid is generated. The first overflow liquid that does not meet the standard is re-entered into the second mixing tank through the pneumatic pump for cyclic washing until it meets the standard and is discharged from the first thickener to the FCDI device, and finally a chemical liquid meeting the standard of qualified electrolytic manganese liquid is obtained; the waste residue is discharged from the slag discharge pipe below the third thickener; during the operation of the device, the flocculant feeding bucket continuously drops the flocculant into the third mixing tank through the pipeline and the water tap.

[0008] Preferably, the method for washing and enriching and recovering manganese-ammonium ions in electrolytic manganese chemical slurry by combining CCD-FCDI includes the following steps:

[0009] (1) The chemical slurry enters the first mixing tank from the feed pipe. After the chemical slurry is washed and mixed with the washing water in the first mixing tank, it impacts from the pipeline of the first thickener to the wall surface of the central column of the first thickener and then flows to the bottom of the first thickener to form the first chemical slurry.

[0010] (2) The diaphragm pneumatic pump below the first thickener lifts the first chemical slurry to the second mixing tank through the first mixing tank. After being washed and mixed with the washing water in the second mixing tank, it impacts to the wall surface of the central column of the second thickener and then flows to the bottom of the second thickener to form the second chemical slurry.

[0011] (3) The diaphragm pneumatic pump below the second thickener lifts the second chemical slurry to the third mixing tank through the second mixing tank. After being washed and mixed with the washing water in the third mixing tank, it impacts to the wall surface of the central column of the third thickener and flows to the bottom of the third thickener to form the third chemical slurry; the waste residue precipitated at the bottom is discharged through the discharge pipe.

[0012] (4) Clear water washes and scrubs the third chemical slurry from the clear water pipe through the third mixing tank and the pipeline. When the third thickener is full, the third overflow liquid is generated to the third mixing tank.

[0013] (5) The third overflow liquid enters the bottom of the second thickener through the second mixing tank. When the second thickener is full, the second overflow liquid is generated.

[0014] (6) The second overflow liquid enters the bottom of the first thickener through the first mixing tank. When the first thickener is full, the first overflow liquid is generated.

[0015] (7) The unqualified primary overflow liquid in the primary thickener re-enters the secondary mixing tank through a pneumatic pump for cyclic washing until it meets the standard. The qualified primary overflow liquid is the chemical combination liquid that meets the requirements for subsequent electrolytic manganese production.

[0016] (8) During the operation of the device, the flocculant feeding tank continuously stirs and mixes the flocculant, and continuously drips the flocculant solution into the tertiary mixing tank through a pipeline and a faucet.

[0017] (9) The qualified primary overflow liquid flows into the FCDI and is electrified. It flows on the current collecting plate through a diversion trough, and an activated carbon suspension is added through the slurry inlet of the FCDI device. Under the action of an electric field, the chemical combination liquid containing activated carbon and high manganese ion concentration will flow out from the current collecting plates at both poles. At this time, the manganese ion concentration in the chemical combination liquid meets the standard of qualified electrolytic manganese liquid.

[0018] Preferably, the manganese sulfate content in the chemical combination slurry in step (1) is 40 g / L.

[0019] Preferably, in step (7), the manganese sulfate washing rate of the filtrate compared to the chemical combination slurry > 90%.

[0020] Preferably, in step (8), the addition amount of the flocculant is related to the amount of the chemical combination slurry to be treated, and is 40 g / m 3 .

[0021] Preferably, in step (9), the final concentration of manganese sulfate in the chemical combination liquid ≥ 38 g / L. Preferably, the method is realized based on a CCD device and an FCDI device. The CCD device, namely the multi-stage countercurrent water washing device, includes: a flocculant feeding tank, a tertiary thickener, a secondary thickener, a primary thickener, a tertiary mixing tank, a secondary mixing tank, a primary mixing tank, three pneumatic pumps, and connecting pipelines; the FCDI device includes an anode current collecting plate, a cathode current collecting plate, gaskets, plexiglass, and a solution collecting device.

[0022] In summary, by adopting the above technical solutions, the beneficial effects of the present invention are as follows:

[0023] 1. Compared with the pressure filtration process, the pneumatic pump and manganese concentration in the present invention reduce the power cost compared with the slurry pump before the pressure filter, are convenient for debugging and maintenance, reduce the labor cost compared with removing filter residues by pressure filtration, and the input of flocculant and activated carbon and the replacement of the filter screen reduce the consumable cost compared with the filter cloth, which shows that the multi-stage countercurrent water washing combined with the flow-through electrode capacitor device has great advantages in treating chemical combination slurry.

[0024] 2. The washing process of the present invention is cyclic washing, which greatly reduces the water consumption, improves the processing efficiency, and also avoids the problem of filter cloth blockage during the pressure filtration process.

[0025] 3. The present invention recovers manganese and ammonium, and the concentrations of manganese and ammonium in the waste residue are lower, making it easier to harmlessly treat and recycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 FIG. is the overall technical route diagram of a method for washing, enriching and recovering manganese and ammonium ions in electrolytic manganese chemical slurry by a combined multi-stage countercurrent water system-FCDI device proposed by the present invention;

[0027] Figure 2 FIG. is the schematic diagram of the flow electrode capacitor device;

[0028] Figure 3 FIG. is the schematic view of the flow electrode capacitor device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and example diagrams. Example 1:

[0030] As Figure 1 shown, in this embodiment, a method for washing, enriching and recovering manganese and ammonium ions in electrolytic manganese chemical slurry by combining CCD-FCDI is constructed. The chemical slurry of the CCD device enters the bottom of the third thickener in the order of the first-stage mixing tank, the first thickener, the first-stage mixing tank, the second-stage mixing tank, the second thickener, the second-stage mixing tank, the third-stage mixing tank, and the third thickener from the feed pipe to form the third-stage chemical slurry; the clear water enters the third-stage mixing tank from the clear water pipe to wash the third-stage chemical slurry. The overflow liquid of the third thickener generated by the washing enters the second-stage mixing tank through the third-stage mixing tank, and then enters the bottom of the first thickener in the order of the second thickener, the second-stage mixing tank, and the first-stage mixing tank; when the first thickener is full, the first overflow liquid is generated. The first overflow liquid that does not meet the standard is re-entered into the second-stage mixing tank through the pneumatic pump for cyclic washing until it meets the standard and is discharged from the first thickener to the FCDI device. Finally, a chemical liquid meeting the standard of the qualified liquid for electrolytic manganese is obtained; the waste residue is discharged from the slag discharge pipe below the third thickener; during the operation of the device, the flocculant feeding bucket continuously drops the flocculant into the third-stage mixing tank through the pipeline and the water tap. The compound slurry of the device enters the bottom of the first thickener from the feed pipe and moves step by step backward; the compound slurry enters from the mixing tank of the first thickener, and the concentrated slurry is washed step by step in the order of flowing through the first, second, and third thickeners; the overflow of the third mixing tank enters the second thickener under the action of gravity, and then enters the mixing tank of this stage from the second thickener until it enters the first thickener. After the liquid level of the first thickener exceeds the overflow port, the overflow liquid finally discharges from the first thickener, and the waste residue discharges from the slag discharge pipe below the third thickener; during this process, the flocculant feeding bucket continuously drops the flocculant into the third mixing tank through the pipeline and the faucet; the compound liquid after multi-stage countercurrent washing enters the FCDI device, and finally obtains the compound liquid that meets the index requirements for the subsequent production of electrolytic manganese. Among them, the method is realized based on the CCD device (multi-stage countercurrent water washing device) and the FCDI device. The multi-stage countercurrent water washing device includes: a flocculant feeding bucket, a third thickener, a second thickener, a first thickener, a third mixing tank, a second mixing tank, a first mixing tank, three pneumatic pumps and connecting pipelines; the FCDI device includes an anode current collector plate, a cathode current collector plate, gaskets, plexiglass and a solution collection device. The multi-stage countercurrent water washing device and the FCDI device involved in the method are as Figure 1 shown. The compound slurry enters the first thickener from the feed pipe, sinks to the bottom after the flocculation water washing effect therein, and is then lifted to the second thickener by a pneumatic pump. After the same process as above, it enters the third thickener from the second thickener through a pneumatic pump, and finally the waste residue that sinks to the bottom flows out through the slag discharge pipe. Clear water enters the third mixing tank from the water inlet pipe, is mixed with the flocculant and then enters the third thickener for flocculation water washing. When the liquid level in the third thickener is higher than the overflow port, it enters the second mixing tank through the overflow port and the connecting pipeline. After mixing, the liquid enters the second thickener in the same way as above, and then enters the first mixing tank and the first thickener in turn after flocculation water washing. When the liquid level in the first thickener exceeds the overflow port, the supernatant flows into the FCDI device through the overflow port and the liquid outlet pipe.

[0035] The FCDI device, as Figure 2 shown, shows the anode current collector plate, the cathode current collector plate, gaskets, plexiglass and the solution collection device on it. The supernatant flowing into the FCDI from the multi-stage countercurrent device enters through the liquid inlet, and at the same time, the carbon slurry with a carbon content of 20% enters from the slurry inlet of the two current collector plates and adds current to the current collector plates on both sides of the device. After running for a period of time, the carbon slurry solution attached with manganese sulfate flows out from the current collector plates on both sides. When the manganese ion concentration reaches the standard, it is the qualified liquid for electrolytic manganese.

[0036] The schematic diagram of the FCDI device, as Figure 3As shown in the figure. When the supernatant flows in from the inlet, with the current applied to the two side current collectors, manganese ions and sulfate ions in the solution are adsorbed onto the activated carbon particles in the two side current collectors and flow out with the activated carbon particles, forming an electrolytic manganese qualified solution with a qualified concentration. A method for washing, enriching and recovering manganese and ammonium ions in electrolytic manganese chemical slurry by combining CCD-FCDI provided by the present invention combines a multi-stage countercurrent water washing device and an FCDI device to treat electrolytic manganese chemical slurry. Through the combination of solid-liquid separation and ion enrichment methods, the specific method of solid-liquid separation is multi-stage countercurrent water washing. After multi-stage water washing, the contents of manganese and ammonia nitrogen in the waste residue can be greatly reduced, which is beneficial to the subsequent recycling of the waste residue. The specific method of ion enrichment is the FCDI technology, that is, the flow-through electrode capacitive deionization technology. After passing through the FCDI device, the content of manganese ions in the liquid can be greatly increased, and an electrolytic manganese qualified solution with a qualified concentration can be obtained.

[0037] The present invention aims to avoid the problem that the electrolytic manganese slag formed by the conventional process is difficult to be disposed of and materialized subsequently due to its high manganese and ammonium content; and then enrich manganese and ammonium ions through the flow-through electrode capacitor to make their concentrations meet the production requirements of the electrolytic manganese qualified solution. Example 2: In addition to including the content of the above embodiments, the specific process of the method for washing, enriching and recovering manganese and ammonium ions in electrolytic manganese chemical slurry by combining CCD-FCDI in this embodiment is as follows:

[0038] The chemical slurry enters from the slurry inlet, and the clear water enters from the water inlet. At the same time, the flocculant is continuously dropped into the first, second, and third mixing tanks; then the third thickener, the second thickener, and the first thickener reach the overflow state in sequence, and the supernatant carrying manganese and ammonia flows from the first thickener into the FCDI device.

[0039] Under the condition that a voltage is applied to the two side current collectors and the supernatant flows in from the liquid inlet, the activated carbon solution is introduced into the two side current collectors, and finally the electrolytic manganese qualified solution containing manganese and ammonia flows out from the liquid outlet. Specifically, the method for washing, enriching and recovering manganese and ammonium ions in electrolytic manganese chemical slurry by combining CCD-FCDI includes the following steps: (1) The chemical slurry enters the first mixing tank from the feed pipe. After the chemical slurry is washed and mixed with the washing water in the first mixing tank, it impacts from the pipe of the first thickener to the wall of the central column of the first thickener and then flows to the bottom of the first thickener to form the first chemical slurry; (2) The diaphragm pneumatic pump below the first thickener lifts the first chemical slurry to the second mixing tank through the first mixing tank. After being washed and mixed with the washing water in the second mixing tank, it impacts to the wall of the central column of the second thickener and then flows to the bottom of the second thickener to form the second chemical slurry; (3) The diaphragm pneumatic pump below the secondary thickener lifts the secondary chemical slurry through the secondary mixing tank to the tertiary mixing tank. After flushing and mixing with the washing water in the tertiary mixing tank, it impacts the wall surface of the central column of the tertiary thickener and flows to the bottom of the tertiary thickener to form the tertiary chemical slurry; the waste residue precipitated at the bottom is discharged through the discharge pipe. (4) Clear water from the clear water pipe flushes and washes the tertiary chemical slurry through the tertiary mixing tank and pipelines. After the tertiary thickener is filled, tertiary overflow liquid is generated and flows to the tertiary mixing tank. (5) The tertiary overflow liquid enters the bottom of the secondary thickener through the secondary mixing tank. After the secondary thickener is filled, secondary overflow liquid is generated. (6) The secondary overflow liquid enters the bottom of the primary thickener through the primary mixing tank. After the primary thickener is filled, primary overflow liquid is generated. (7) The unqualified primary overflow liquid in the primary thickener re-enters the secondary mixing tank through the pneumatic pump for cyclic washing until it meets the standard. The qualified primary overflow liquid is the chemical liquid that meets the requirements for the subsequent production of electrolytic manganese. (8) The flocculant feeding bucket continuously stirs and mixes the flocculant during the operation of the device, and continuously drips the flocculant solution into the tertiary mixing tank through pipelines and faucets. (9) The qualified primary overflow liquid flows into the FCDI and is electrified. It flows through the diversion channels on the current collecting plate, and the activated carbon suspension is added through the slurry inlet of the FCDI device. Under the action of the electric field, the chemical liquid of high manganese ion concentration containing activated carbon will flow out from the current collecting plates at both poles. At this time, the manganese ion concentration of the chemical liquid meets the standard of the qualified liquid for electrolytic manganese. Compared with the pressure filtration process, the pneumatic pump and manganese concentration in the present invention reduce the power cost compared with the slurry pump before the pressure filter. The commissioning and maintenance are convenient, and the labor cost is reduced compared with removing filter residues by pressure filtration. The input of flocculant and activated carbon and the replacement of the filter screen reduce the consumable cost compared with the filter cloth, which shows that the multi-stage countercurrent water washing combined with the flow-through electrode capacitor device has great advantages in treating chemical slurries. In addition, the washing process of the present invention is cyclic washing, which greatly reduces the water consumption, improves the treatment efficiency, and also avoids the problem of filter cloth blockage during the pressure filtration process. Example 3: In addition to including the content of the above embodiments, this embodiment further lies in: In step (1), the manganese sulfate content in the chemical slurry is 40 g / L. In step (7), the washing rate of manganese sulfate in the filtrate compared with the chemical slurry > 90%. In step (8), the addition amount of the flocculant is related to the amount of the treated chemical slurry and is 40 g / m 3 . In step (9), the final manganese sulfate concentration in the chemical liquid ≥ 38 g / L. The treatment object of the present invention is the chemical slurry in the electrolytic manganese production process, and the solid waste therein is pre-treated, so that the manganese recovery rate reaches 58%, and the ammonia nitrogen removal rate reaches 88%, with significant effects.

[0040] Compared with filter pressing, the multi-stage countercurrent water washing and FCDI manganese and ammonium ion enrichment of the device of the present invention have more advantages, which can significantly reduce the energy consumption in the production process and reduce the retention of manganese and ammonium ions in the waste residue. The filter pressing process not only consumes electricity, but also consumes manpower to discharge the filter residue from the filter cloth. The filter cloth also needs to be replaced every once in a while, and the electricity cost, labor cost, and consumables cost are relatively high. After the multi-stage countercurrent water washing and FCDI device are debugged, they can be operated stably for a long time. The device maintenance is simple and the degree of automation is high, which reduces the labor cost; the power consumption of the pneumatic pump and the FCDI device is much lower than that of the slurry pump before the filter press, which reduces the electricity cost; at the same time, the multi-stage countercurrent water washing does not require the replacement of the filter cloth, but only needs to add a certain amount of flocculant solution. The FCDI device also only needs to add a certain amount of activated carbon and regularly replace the filter screen, and the consumables cost is relatively lower. In summary, the use of multi-stage countercurrent water washing and FCDI devices to replace the filter pressing purification process in the electrolytic manganese production process has great application prospects and advantages.

[0041] The above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and many variations are possible. All variations that can be directly derived or associated with the contents disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A method for washing, enriching and recovering manganese-ammonium ions in electrolytic manganese composite slurry by combining CCD-FCDI, characterized in that, The compound slurry of the CCD device enters the bottom of the third thickener to form the third-stage compound slurry in the order of the first-stage mixing tank, the first-stage thickener, the first-stage mixing tank, the second-stage mixing tank, the second-stage thickener, the second-stage mixing tank, the third-stage mixing tank, and the third-stage thickener through the feed pipe; fresh water enters the third-stage mixing tank from the fresh water pipe to wash the third-stage compound slurry. The overflow liquid of the third-stage thickener generated by the washing enters the second-stage mixing tank through the third-stage mixing tank, and then enters the bottom of the first-stage thickener in the order of the second-stage thickener, the second-stage mixing tank, and the first-stage mixing tank; when the first-stage thickener is full, the first-stage overflow liquid is generated. The first-stage overflow liquid that does not meet the standard is re-entered into the second-stage mixing tank through the pneumatic pump for cyclic washing until it meets the standard and is discharged from the first-stage thickener to the FCDI device. Finally, the compound liquid that meets the standard of the qualified liquid for electrolytic manganese is obtained; the waste residue is discharged from the slag discharge pipe below the third-stage thickener; during the operation of the device, the flocculant feeding bucket continuously drips the flocculant into the third-stage mixing tank through the pipeline and the faucet.

2. The method for washing, enriching and recovering manganese-ammonium ions in electrolytic manganese composite slurry by combining CCD-FCDI as claimed in claim 1, characterized in that: It includes the following steps: (1) The compound slurry enters the first-stage mixing tank from the feed pipe. After the compound slurry is washed and mixed with the washing water in the first-stage mixing tank, it impacts the wall of the central column of the first-stage thickener through the pipeline of the first-stage thickener and then flows to the bottom of the first-stage thickener to form the first-stage compound slurry. (2) The diaphragm pneumatic pump below the first-stage thickener lifts the first-stage compound slurry to the second-stage mixing tank through the first-stage mixing tank. After being washed and mixed with the washing water in the second-stage mixing tank, it impacts the wall of the central column of the second-stage thickener and then flows to the bottom of the second-stage thickener to form the second-stage compound slurry. (3) The diaphragm pneumatic pump below the second-stage thickener lifts the second-stage compound slurry to the third-stage mixing tank through the second-stage mixing tank. After being washed and mixed with the washing water in the third-stage mixing tank, it impacts the wall of the central column of the third-stage thickener and flows to the bottom of the third-stage thickener to form the third-stage compound slurry; the waste residue precipitated at the bottom is discharged through the discharge pipe. (4) Fresh water washes the third-stage compound slurry from the fresh water pipe through the third-stage mixing tank and the pipeline. When the third-stage thickener is full, the third-stage overflow liquid is generated to the third-stage mixing tank. (5) The third-stage overflow liquid enters the bottom of the second-stage thickener through the second-stage mixing tank. When the second-stage thickener is full, the second-stage overflow liquid is generated. (6) The second-stage overflow liquid enters the bottom of the first-stage thickener through the first-stage mixing tank. When the first-stage thickener is full, the first-stage overflow liquid is generated. (7) The first-stage overflow liquid that does not meet the standard in the first-stage thickener is re-entered into the second-stage mixing tank through the pneumatic pump for cyclic washing until it meets the standard. The first-stage overflow liquid that meets the standard is the compound liquid that meets the indexes required for the subsequent production of electrolytic manganese. (8) The flocculant feeding bucket continuously stirs and mixes the flocculant during the operation of the device, and continuously drips the flocculant solution into the third-stage mixing tank through the pipeline and the faucet. (9) The first-stage overflow liquid that meets the standard flows into the FCDI and is electrified. It flows on the current collecting plate through the diversion groove, and the activated carbon suspension liquid is added through the feed port of the FCDI device. Under the action of the electric field, the compound liquid containing activated carbon and high manganese ion concentration will flow out from the current collecting plates at both poles. At this time, the manganese ion concentration of the compound liquid meets the standard of the qualified liquid for electrolytic manganese.

3. The method according to claim 2, characterized in that : The content of manganese sulfate in the combined slurry in step (1) is 40 g / L.

4. The method according to claim 2, characterized in that : In step (7), the washing rate of manganese sulfate in the filtrate compared to the combined slurry is > 90%.

5. The method according to claim 2, characterized in that : The dosage of the flocculant in step (8) is related to the amount of the chemical slurry to be treated, and is 40 g / m 3 .

6. The method according to claim 2, wherein : In step (9), the concentration of manganese sulfate in the final combined liquid is ≥ 38 g / L.

7. The method according to claim 1, wherein: The method is implemented based on a CCD device and an FCDI device. The CCD device includes: a flocculant feeding tank, a three-stage thickener, a two-stage thickener, a one-stage thickener, a three-stage mixing tank, a two-stage mixing tank, a one-stage mixing tank, three pneumatic pumps, and connecting pipes; the FCDI device includes an anode current collector plate, a cathode current collector plate, gaskets, plexiglass, and a solution collection device.

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