Method for removing and recovering ammonia nitrogen in electrolytic manganese residue

Abstract

The present application relates to a kind of methods for removing and recovering ammonia nitrogen in electrolytic manganese residue, comprising adding magnesium slag to electrolytic manganese residue solution, adjusting the pH of mixed solution, constant temperature hot water bath reaction, stirring to obtain the first ammonia nitrogen removal electrolytic manganese residue solution;The first ammonia nitrogen removal electrolytic manganese residue solution is first pressure filtration to obtain filtrate and filter residue, and the filter residue is washed with water to obtain a primary solution;The primary solution is subjected to the pressure filtration and water washing of the previous step, and the steps of repeated pressure filtration and water washing are repeated, and the filtrate is obtained each time, and the filter residue obtained after the last water washing is subjected to pressure filtration to obtain the solution, which is the ammonia nitrogen removal electrolytic manganese residue.The ammonia gas generated in the constant temperature hot water bath reaction process and the filtrate are heated and evaporated to enter the ammonia nitrogen recovery device for recovery;The removal rate of ammonia nitrogen by the method is not less than 95.4%, and the recovery rate of ammonia nitrogen is not less than 76.8%.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of comprehensive utilization of industrial solid waste resources, and particularly relates to a green and environmentally-friendly method for efficiently removing and recycling ammonia nitrogen in electrolytic manganese residue from cheap solid waste. BACKGROUND

[0002] China is a big country of manganese production, and the annual manganese output accounts for about 98% of the world. In recent years, with the rapid development of the electrolytic manganese industry, the by-product electrolytic manganese residue produced in industrial manganese production is increasing. According to relevant statistics, 10-12 tons of electrolytic manganese residue will be produced for every ton of electrolytic manganese. The excess waste residue cannot be properly treated and is stacked on the ground. The toxic substances in the electrolytic manganese residue will cause serious pollution and damage to the soil, water and even human health. As a kind of difficult-to-treat industrial solid waste material, the chemical composition of the waste residue contains a large amount of CaSO4·2H2O (gypsum), accounting for about 45% by weight, and other main components include SiO2, Al2O3, Fe2O3, CaO, SO3 and MnO. A large number of studies have shown that the electrolytic manganese residue contains a large amount of NH4 + -N (soluble in water). The NH4 + -N present in the electrolytic manganese residue must be treated harmlessly before resource recycling and utilization.

[0003] Silicate cement materials are widely used in the construction and manufacturing industries. With the increasing amount of consumption year by year, the resources of cement materials available from the natural environment are close to exhaustion, and the material cost is increasing year by year. Industrial solid waste can be used as an admixture to replace part of ordinary silicate cement to prepare new waste residue cement. The chemical composition of electrolytic manganese residue is close to that of cement materials, and can be used as an ideal silicate cement replacement material. At the same time, ammonia nitrogen is an essential agricultural fertilizer raw material in agricultural production. Efficient recovery of ammonia nitrogen in electrolytic manganese residue and application in agricultural production can produce significant economic benefits. SUMMARY

[0004] In view of the above problems existing in the prior art, the purpose of the present application is to provide a material for removing ammonia nitrogen in electrolytic manganese residue and a method for removing and recycling ammonia nitrogen.

[0005] To solve the above technical problems, the present application adopts the following technical scheme: a method for removing and recycling ammonia nitrogen in electrolytic manganese residue, comprising the following steps:

[0006] Removing ammonia nitrogen: magnesium slag is added to the electrolytic manganese residue solution, wherein the mass ratio of the electrolytic manganese residue and the magnesium slag is controlled to be 100:25-35, the pH of the mixed solution is adjusted to be 9-11, the constant temperature water bath temperature is controlled to be 90-100℃, the reaction time is 1-2h, and the stirring speed is 475-500r / min to obtain a first deammoniation electrolytic manganese residue solution.

[0007] The primary deamination and nitrogen electrolytic manganese residue solution is first pressure filtered to obtain filtrate and filter residue, and the filter residue is washed with water to obtain a primary solution; the primary solution is subjected to the previous pressure filtration and water washing, and the steps of pressure filtration and water washing are repeated multiple times, and the filtrate is obtained each time the pressure filtration is performed, and the filter residue obtained after the last water washing is subjected to pressure filtration to obtain the solution, which is the deamination and nitrogen electrolytic manganese residue.

[0008] The ammonia gas generated during the reaction of the electrolytic manganese residue and the magnesium residue in the constant-temperature hot water bath is introduced into the ammonia and nitrogen recovery device for recovery, and the filtrate is heated, evaporated and vaporized to be introduced into the ammonia and nitrogen recovery device for recovery.

[0009] Preferably, the magnesium residue comprises MgO, CaO and inevitable other impurities, and the weight ratio of MgO:CaO is 1:2-5.

[0010] Preferably, the ammonia and nitrogen recovery device comprises a box body, the bottom of the box body is provided with a water inlet and a water outlet, a moving plate is arranged in the box body to divide the box body into two independent spaces, the upper space is a front cabin, and the lower space is a pressurized cabin, the moving plate is in sliding fit with the box body, the moving plate is provided with a plurality of air holes, and a one-way valve is arranged on each air hole; and the top of the box body is provided with an air inlet.

[0011] Preferably, the device further comprises a motor, the motor is arranged outside the top of the box body, the output shaft of the motor is connected with a transmission rod, the lower end of the transmission rod penetrates into the pressurized cabin through the moving plate, a plurality of stirring shafts are fixedly connected to the lower end of the transmission rod, a plurality of stirring rings are fixedly connected to each stirring shaft along the length direction of the stirring shaft, and the plurality of stirring shafts are arranged uniformly along the circumference of the transmission rod.

[0012] Preferably, the device further comprises a disc-shaped pipe arranged inside the top wall of the box body, the disc-shaped pipe is in sealed communication with the air inlet, and the disc-shaped pipe is provided with a plurality of air holes, and a one-way valve is arranged on each air hole.

[0013] Preferably, a plurality of moving clamping grooves are arranged on the inner wall of the box body and matched with the moving plate, and each moving clamping groove is inclined downward.

[0014] Compared with the prior art, the present application has at least the following advantages:

[0015] The magnesium residue is a cheap alternative material, and the removal rate of ammonia and nitrogen in the electrolytic manganese residue can reach 98.5%, the electrolytic manganese residue from which the ammonia and nitrogen are removed can be directly applied in the field of building materials, such as preparation of cementing materials, autoclaved bricks and light aggregates, etc. The ammonia and nitrogen recovery device can increase the recovery efficiency of ammonia and nitrogen by adjusting the air pressure and the stirring efficiency, and the recovery rate of ammonia and nitrogen is not less than 76.8%, and the recovered ammonia and nitrogen can be applied in preparation of agricultural nitrogen fertilizer, etc. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1A flow chart of a method for removing and recovering ammonia nitrogen in electrolytic manganese residue.

[0017] Figure 2 A structural schematic diagram of an ammonia nitrogen recovery device.

[0018] In the figure, the box-10, water inlet-11, disc-shaped tube-12, one-way valve-121, water outlet-13, front cabin-15, pressurized cabin-17, air inlet-19; moving plate-20; motor-30, transmission rod-31, stirring shaft-33, stirring ring-35, moving clamping groove-40. DETAILED DESCRIPTION

[0019] The application will be further described in detail below.

[0020] Reference Figure 1 and Figure 2 A method for removing and recovering ammonia nitrogen in electrolytic manganese residue, comprising the following steps:

[0021] S1: removing ammonia nitrogen: adding magnesium residue to the electrolytic manganese residue solution, wherein the mass ratio of electrolytic manganese residue to magnesium residue is controlled at 100:25-35 【100 parts of electrolytic manganese residue are weighed, and then 25-35 parts of magnesium residue are weighed accordingly.】 The pH of the mixed solution is adjusted to 9-11, the constant temperature water bath temperature is controlled at 90-100℃, the reaction time is 12h, and the stirring speed is 475-500r / min to obtain a first ammonia nitrogen removal electrolytic manganese residue solution.

[0022] S2: The first ammonia nitrogen removal electrolytic manganese residue solution is first pressure filtered to obtain a filtrate and a filter residue, and the filter residue is washed with water to obtain a primary solution; the primary solution is subjected to pressure filtration and water washing of the previous step, and the steps of pressure filtration and water washing are repeated multiple times, and the filtrate is obtained each time the pressure filtration is performed, and the filter residue obtained after the last water washing and pressure filtration is the ammonia nitrogen removal electrolytic manganese residue. The electrolytic manganese residue solution is mixed with magnesium residue to obtain a mixed solution, and the solvent of the mixed solution is water or industrial wastewater. The magnesium residue is an industrial byproduct generated during the production of industrial metal magnesium, and is a kind of industrial solid waste. The temperature is controlled at 90-100℃, the reaction time is 0.5h, 1h, 1.5h or 2h, and the stirring speed is 475-500r / min to remove ammonia nitrogen from the electrolytic manganese residue once.

[0023] S3: recovering ammonia nitrogen: ammonia gas generated during the constant temperature water bath reaction of the electrolytic manganese residue and the magnesium residue is recovered in the ammonia nitrogen recovery device, and the filtrate is evaporated and then recovered in the ammonia nitrogen recovery device.

[0024] Specifically, referring to Figure 1The manganese residue solution is first filtered to obtain filtrate and residue, and the residue is washed to obtain a first-stage solution; the first-stage solution is filtered to obtain filtrate and residue, and the residue is washed to obtain a second-stage solution; the second-stage solution is filtered to obtain filtrate and residue, and the residue is dried and sealed.

[0025] Specifically, the magnesium slag comprises MgO, CaO and other inevitable impurities, and the weight ratio of MgO to CaO is 1:2-5.

[0026] Specifically, the ammonia nitrogen recovery device comprises a box body 10, the bottom of the box body 10 is provided with a water inlet 11 and a water outlet 13, and the box body 10 is provided with a moving plate 20 for dividing the box body 10 into two independent spaces, wherein the upper space is a front cabin 15, and the lower space is a pressurizing cabin 17; the moving plate 20 is in sliding fit with the box body 10, the moving plate 20 is provided with a plurality of air holes, and each air hole is provided with a one-way valve; the top of the box body 10 is provided with an air inlet 19; the device further comprises a motor 30 arranged outside the top of the box body 10, the output shaft of the motor 30 is connected with a transmission rod 31, the lower end of the transmission rod 31 penetrates through the moving plate 20 and enters the pressurizing cabin 17, the lower end of the transmission rod 31 is fixedly connected with a plurality of stirring shafts 33, each stirring shaft 33 is fixedly connected with a plurality of stirring rings 35 along the length direction of the stirring shaft 33, and the plurality of stirring shafts 33 are evenly arranged along the circumferential direction of the transmission rod 31; the device further comprises a disc-shaped pipe 12 arranged inside the top wall of the box body 10, the disc-shaped pipe 12 is in sealed communication with the air inlet 19, and the disc-shaped pipe 12 is provided with a plurality of air holes, each air hole is provided with a one-way valve 121; the inner wall of the box body 10 is further provided with a plurality of moving clamping grooves 40 matched with the moving plate 20, and each moving clamping groove 40 is inclined downward.

[0027] In the ammonia nitrogen recovery stage S3, the ammonia gas generated in the process of electrolyzing the manganese residue and the magnesium residue in the constant-temperature hot water bath is introduced into the ammonia nitrogen recovery device through the air inlet 19, the filtrate vaporized after being heated and evaporated in the step S2 is also introduced into the ammonia nitrogen recovery device through the air inlet 19, the ammonia nitrogen enters the recovery device in the form of ammonia gas and then dissolves in water, and finally the ammonia nitrogen is recovered in the form of ammonia water, the ammonia gas and the vaporized filtrate are dispersed into the front cabin 15 through the air holes of the disc-shaped pipe 12, and the disc-shaped pipe 12 is mainly used to uniformly and quickly disperse the ammonia gas and the vaporized filtrate into the front cabin 15, and the one-way valves 121 arranged on the air holes prevent the gas in the front cabin 15 from being discharged from the air inlet 19 due to excessive pressure.

[0028] When the pressure in the front cabin 15 is greater than that in the pressurized cabin 17, the ammonia gas and the vaporized filtrate in the front cabin 15 enter the pressurized cabin 17 through the air holes in the moving plate 20, and the pressurized cabin 17 contains water through the water inlet 19. At this time, the ammonia gas and the vaporized filtrate contact the water and dissolve in the water. In order to improve the water solubility, the motor 30 is started, the motor 30 drives the transmission rod 31 to rotate, the transmission rod 31 drives the stirring shaft 33 to rotate, thereby stirring the water in the pressurized cabin 17, increasing the contact area of the ammonia gas and the vaporized filtrate with the water, and further setting the stirring ring 35 on the stirring shaft 33 to further increase the contact area of the ammonia gas and the vaporized filtrate with the water and improve the water solubility of the ammonia gas and the vaporized filtrate.

[0029] When the pressure difference between the front cabin 15 and the pressurized cabin 17 is large, the moving plate 20 will be affected by the pressure and move to the pressurized cabin 17. A plurality of moving clamping grooves 40 matched with the moving plate 20 are arranged on the inner side wall of the box body 10, and each moving clamping groove 40 is inclined downward, that is, the side of each moving clamping groove 40 close to the moving plate 20 is lower than the opposite side. When the pressure difference between the front cabin 15 and the pressurized cabin 17 is large, the moving plate 20 will be affected by the pressure and move to the pressurized cabin 17. The two ends of the moving plate 20 are clamped in the corresponding moving clamping grooves 40, and are temporarily stabilized. When the pressure difference between the front cabin 15 and the pressurized cabin 17 further increases, the two ends of the moving plate 20 slide out of the corresponding moving clamping grooves 40 and enter the next pair of moving clamping grooves 40.

[0030] After the water absorbs the ammonia gas and the vaporized filtrate for a period of time, the water is discharged through the water outlet 13 and new water is injected through the water inlet 11.

[0031] Through experiments, it is verified that the removal rate of ammonia nitrogen is not less than 95.4% and the recovery rate of ammonia nitrogen is not less than 76.8% through the method.

[0032] Embodiment:

[0033] The raw material electrolytic manganese residue used in the embodiment of the application is taken from a manganese production factory in Zunyi City, Guizhou Province, and the additive material magnesium slag is taken from a magnesium factory in Qingzhen City, Guiyang City, Guizhou Province. The chemical compositions of the two materials are analyzed by an X-ray fluorescence spectrometer (XRF-ZSXPrimu III+), and the analysis is shown in Table 1.

[0034] Table 1

[0035]

[0036] Embodiment one: A method for removing and recovering ammonia nitrogen in electrolytic manganese residue, the steps are as follows:

[0037] Take 100 parts of electrolytic manganese residue and 500 parts of water to mix evenly, put the electrolytic manganese residue solution in the blender to stir, stop stirring when there is no more large particles in the solution, measure the initial PH value of the electrolytic manganese residue solution with PHS-3C acidity meter and record it. Take another 30 parts of magnesium slag and 150 parts of water to mix evenly, put it in the blender to stir until it forms a suspension, add the magnesium slag suspension to the electrolytic manganese residue solution in batches and measure the PH value of the solution, adjust the PH to 9, stop adding magnesium slag, put the obtained solution in a constant temperature water bath, adjust the temperature to 90℃, the stirring speed of the blender is 495r / min, react for 1h, the gas generated during the reaction is sucked into the ammonia recovery device through the gas inlet pipe, the obtained reaction solution is subjected to solid-liquid separation by pressure filtration, then it is washed with three stages of water and filtered to obtain electrolytic manganese residue with removed ammonia nitrogen, the filtrate generated during the water washing process is treated by evaporation and cooling to recover the remaining ammonia nitrogen, finally, the electrolytic manganese residue with removed ammonia nitrogen is made into a cake and dried in a constant temperature drying oven at 100℃, detect the ammonia nitrogen content in the treated electrolytic manganese residue and the original sample as well as the ammonia nitrogen content in the ammonia nitrogen recovery device, compare and calculate the ammonia nitrogen removal rate and recovery rate of the electrolytic manganese residue.

[0038] The ammonia nitrogen removal rate and recovery rate of the magnesium slag treated electrolytic manganese residue are 92.3% and 73.9% respectively.

[0039] Example two: a method for removing and recovering ammonia nitrogen in electrolytic manganese residue, the steps are as follows:

[0040] Take 100 parts of electrolytic manganese residue and 500 parts of water to mix evenly, put the electrolytic manganese residue solution in the blender to stir, stop stirring when there is no more large particles in the solution, measure the initial PH value of the electrolytic manganese residue solution with PHS-3C acidity meter and record it. Take another 30 parts of magnesium slag and 150 parts of water to mix evenly, put it in the blender to stir until it forms a suspension, add the magnesium slag suspension to the electrolytic manganese residue solution in batches and measure the PH value of the solution, adjust the PH to 10, stop adding magnesium slag, put the obtained solution in a constant temperature water bath, adjust the temperature to 90℃, the stirring speed of the blender is 495r / min, react for 1h, the gas generated during the reaction is sucked into the ammonia recovery device through the gas inlet pipe, the obtained reaction solution is subjected to solid-liquid separation by pressure filtration, then it is washed with three stages of water and filtered to obtain electrolytic manganese residue with removed ammonia nitrogen, the filtrate generated during the water washing process is treated by evaporation and cooling to recover the remaining ammonia nitrogen, finally, the electrolytic manganese residue with removed ammonia nitrogen is made into a cake and dried in a constant temperature drying oven at 100℃, detect the ammonia nitrogen content in the treated electrolytic manganese residue and the original sample as well as the ammonia nitrogen content in the ammonia nitrogen recovery device, compare and calculate the ammonia nitrogen removal rate and recovery rate of the electrolytic manganese residue.

[0041] The ammonia nitrogen removal rate and recovery rate of the magnesium slag treated electrolytic manganese residue are 96.2% and 77% respectively.

[0042] Example 3: A method for removing and recovering ammonia nitrogen in electrolytic manganese residue, the steps are as follows:

[0043] Take 100 parts of electrolytic manganese residue and mix with 500 parts of water, place the electrolytic manganese residue solution in a blender and stir, stop stirring when there are no more large particles in the solution, measure the initial PH value of the electrolytic manganese residue solution with a PHS-3C acidity meter and record it. Take another 30 parts of magnesium slag and mix with 150 parts of water, place it in a blender and stir until a suspension is formed, add the magnesium slag suspension to the electrolytic manganese residue solution in small quantities and measure the PH value of the solution, adjust the PH to 11, stop adding magnesium slag, the resulting solution is placed in a constant temperature water bath, the temperature is adjusted to 90℃, the stirring speed of the blender is 495r / min, the reaction is carried out for 1h, the gas generated during the reaction is sucked into the ammonia recovery device through the gas inlet pipe, the resulting reaction solution is subjected to solid-liquid separation by pressure filtration, then washed with three stages of water and filtered to obtain electrolytic manganese residue with removed ammonia nitrogen, the filtrate produced during the water washing process is treated by evaporation and cooling to recover the remaining ammonia nitrogen, finally, the electrolytic manganese residue with removed ammonia nitrogen is made into a cake and dried in a constant temperature drying oven at 100℃, the ammonia nitrogen content in the treated electrolytic manganese residue and the original sample and the ammonia nitrogen content in the ammonia nitrogen recovery device are detected, and the ammonia nitrogen removal rate and recovery rate of the electrolytic manganese residue are calculated.

[0044] The ammonia nitrogen removal rate and recovery rate of the magnesium slag treated electrolytic manganese residue are 98.1% and 77.9% respectively.

[0045] Example 4: A method for removing and recovering ammonia nitrogen in electrolytic manganese residue, the steps are as follows:

[0046] Take 100 parts of electrolytic manganese residue and mix with 500 parts of water, place the electrolytic manganese residue solution in a blender and stir, stop stirring when there are no more large particles in the solution, measure the initial PH value of the electrolytic manganese residue solution with a PHS-3C acidity meter and record it. Take another 30 parts of magnesium slag and mix with 150 parts of water, place it in a blender and stir until a suspension is formed, add the magnesium slag suspension to the electrolytic manganese residue solution in small quantities and measure the PH value of the solution, adjust the PH to 11, stop adding magnesium slag, the resulting solution is placed in a constant temperature water bath, the temperature is adjusted to 95℃, the stirring speed of the blender is 495r / min, the reaction is carried out for 1.5h, the gas generated during the reaction is sucked into the ammonia recovery device through the gas inlet pipe, the resulting reaction solution is subjected to solid-liquid separation by pressure filtration, then washed with three stages of water and filtered to obtain electrolytic manganese residue with removed ammonia nitrogen, the filtrate produced during the water washing process is treated by evaporation and cooling to recover the remaining ammonia nitrogen, finally, the electrolytic manganese residue with removed ammonia nitrogen is made into a cake and dried in a constant temperature drying oven at 100℃, the ammonia nitrogen content in the treated electrolytic manganese residue and the original sample and the ammonia nitrogen content in the ammonia nitrogen recovery device are detected, and the ammonia nitrogen removal rate and recovery rate of the electrolytic manganese residue are calculated.

[0047] The ammonia nitrogen removal rate and recovery rate of the electrolytic manganese residue treated by the magnesium slag are 98.5% and 78.2%, respectively.

[0048] Embodiment five: a method for removing and recovering ammonia nitrogen in electrolytic manganese residue, the steps are as follows:

[0049] 100 parts of electrolytic manganese residue and 500 parts of water are weighed and uniformly mixed, the electrolytic manganese residue solution is placed in a stirrer for stirring, and the stirring is stopped when there is no large particle precipitation in the solution. The initial PH value of the electrolytic manganese residue solution is measured by a PHS-3C acidity meter and recorded. Then 30 parts of magnesium slag and 150 parts of water are weighed and uniformly mixed, and placed in a stirrer for stirring until a suspension is formed. The magnesium slag suspension is added to the electrolytic manganese residue solution in batches, and the PH value of the solution is measured. The PH is adjusted to 11, and the addition of magnesium slag is stopped. The obtained solution is placed in a constant temperature water bath, the temperature is adjusted to 100℃, the stirring speed of the stirrer is 495r / min, and the reaction is carried out for 2h. The gas generated during the reaction is sucked into the ammonia recovery device through the gas inlet pipe. The obtained reaction solution is subjected to solid-liquid separation by pressure filtration, and then subjected to three-stage water washing and pressure filtration to obtain electrolytic manganese residue from which ammonia nitrogen is removed. The filtrate generated during the water washing process is treated by evaporation and cooling to recover the remaining ammonia nitrogen. Finally, the electrolytic manganese residue from which ammonia nitrogen is removed is made into a cake, and is dried in a constant temperature drying oven at 100℃. The ammonia nitrogen content in the treated electrolytic manganese residue and the original sample and the ammonia nitrogen content in the ammonia nitrogen recovery device are detected, and the ammonia nitrogen removal rate and recovery rate of the electrolytic manganese residue are compared and calculated.

[0050] The ammonia nitrogen removal rate and recovery rate of the electrolytic manganese residue treated by the magnesium slag are 98.4% and 79.1%, respectively.

[0051] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the purpose and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A method for removing and recovering ammonia nitrogen in electrolytic manganese residue, characterized in that: It comprises the following steps: The ammonia nitrogen is removed: magnesium slag is added to the electrolytic manganese residue solution, the mass ratio of the electrolytic manganese residue and the magnesium slag is controlled at 100:25-35, the pH of the mixed solution is adjusted to 9-11, the temperature of the constant temperature hot water bath is controlled at 90-100℃, the reaction time is 1-2h, and the stirring speed is 475-500r / min to obtain a first electrolytic manganese residue solution after ammonia nitrogen removal; The first electrolytic manganese residue solution after ammonia nitrogen removal is first pressure filtered to obtain a filtrate and a filter residue, and the filter residue is washed with water to obtain a first solution; the first solution is subjected to the pressure filtration and water washing of the previous step, and the steps of pressure filtration and water washing are repeated multiple times, each time pressure filtration obtains a filtrate, and the filter residue obtained after the last water washing is subjected to pressure filtration to obtain a solution, which is the electrolytic manganese residue after ammonia nitrogen removal; The ammonia gas generated during the reaction of the electrolytic manganese residue and the magnesium slag in the constant temperature hot water bath is introduced into the ammonia nitrogen recovery device for recovery, and the filtrate is heated and evaporated to be vaporized and then introduced into the ammonia nitrogen recovery device for recovery; The magnesium slag comprises MgO, CaO and other inevitable impurities, and the weight ratio of MgO:CaO is 1:2-5; The ammonia nitrogen recovery device comprises a box body (10), the bottom of the box body (10) is provided with a water inlet (11) and a water outlet (13), and a moving plate (20) is arranged in the box body (10) to divide the box body (10) into two independent spaces, wherein the upper space is a front cabin (15), and the lower space is a pressurizing cabin (17); the moving plate (20) is in sliding fit with the box body (10), the moving plate (20) is provided with a plurality of air holes, and a one-way valve is arranged on each air hole; The top of the box body (10) is provided with an air inlet (19).

2. The method for removing and recovering ammonia nitrogen in electrolytic manganese residue according to claim 1, characterized in that: Further, a motor (30) is arranged outside the top of the box body (10), the output shaft of the motor (30) is connected with a transmission rod (31), the lower end of the transmission rod (31) penetrates the moving plate (20) to enter the pressurizing cabin (17), the lower end of the transmission rod (31) is fixedly connected with a plurality of stirring shafts (33), a plurality of stirring rings (35) are fixedly connected with the stirring shafts (33) along the length direction of the stirring shafts (33), and the plurality of stirring shafts (33) are arranged uniformly along the circumference of the transmission rod (31).

3. The method for removing and recovering ammonia nitrogen in electrolytic manganese residue according to claim 2, characterized in that: Further, a disc-shaped pipe (12) is arranged on the inner side of the top wall of the box body (10), the disc-shaped pipe (12) is in sealed communication with the air inlet (19), and the disc-shaped pipe (12) is provided with a plurality of air holes, and a one-way valve (121) is arranged on each air hole.

4. The method for removing and recovering ammonia nitrogen in electrolytic manganese residue according to claim 2, characterized in that: A plurality of moving clamping grooves (40) are arranged on the inner side wall of the box body (10) and matched with the moving plate (20), and each moving clamping groove (40) is inclined downward.

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