CN220144328U - Electrolytic manganese slag circulating alkali washing harmless treatment system - Google Patents
Electrolytic manganese slag circulating alkali washing harmless treatment system Download PDFInfo
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- CN220144328U CN220144328U CN202321464327.5U CN202321464327U CN220144328U CN 220144328 U CN220144328 U CN 220144328U CN 202321464327 U CN202321464327 U CN 202321464327U CN 220144328 U CN220144328 U CN 220144328U
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- ammonia gas
- lime water
- stirring tank
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- 239000002893 slag Substances 0.000 title claims abstract description 125
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 title claims abstract description 120
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 118
- 239000011572 manganese Substances 0.000 title claims abstract description 118
- 238000005406 washing Methods 0.000 title claims abstract description 66
- 239000003513 alkali Substances 0.000 title claims abstract description 28
- 238000003756 stirring Methods 0.000 claims abstract description 98
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 90
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical class [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 67
- 238000007605 air drying Methods 0.000 claims abstract description 33
- 239000004571 lime Substances 0.000 claims abstract description 27
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 26
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 26
- 238000003860 storage Methods 0.000 claims abstract description 16
- 238000010521 absorption reaction Methods 0.000 claims description 24
- 229910021529 ammonia Inorganic materials 0.000 claims description 22
- 239000000706 filtrate Substances 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 17
- 238000005273 aeration Methods 0.000 claims description 12
- 238000005276 aerator Methods 0.000 claims description 3
- 239000012982 microporous membrane Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 11
- 238000005265 energy consumption Methods 0.000 abstract description 9
- 238000009270 solid waste treatment Methods 0.000 abstract 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 32
- 238000006243 chemical reaction Methods 0.000 description 21
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 18
- 239000000292 calcium oxide Substances 0.000 description 16
- 235000012255 calcium oxide Nutrition 0.000 description 16
- 238000002386 leaching Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 239000002910 solid waste Substances 0.000 description 5
- 235000011114 ammonium hydroxide Nutrition 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 231100000419 toxicity Toxicity 0.000 description 3
- 230000001988 toxicity Effects 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011656 manganese carbonate Substances 0.000 description 1
- 235000006748 manganese carbonate Nutrition 0.000 description 1
- 229940093474 manganese carbonate Drugs 0.000 description 1
- 229910000016 manganese(II) carbonate Inorganic materials 0.000 description 1
- XMWCXZJXESXBBY-UHFFFAOYSA-L manganese(ii) carbonate Chemical compound [Mn+2].[O-]C([O-])=O XMWCXZJXESXBBY-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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- Processing Of Solid Wastes (AREA)
Abstract
The utility model discloses an electrolytic manganese slag circulating alkali washing harmless treatment system, relates to the technical field of industrial solid waste treatment, and solves the problems of low lime utilization rate, high energy consumption, complex operation and need of adjusting back pH value after treatment in electrolytic manganese slag harmless treatment. The system comprises an alkaline washing stirring tank, a first filter press, a saturated lime water stirring tank, a lime storage tank, a second filter press, a manganese slag air drying device and an ammonia gas absorbing device. The utility model has the advantages of improving the lime utilization rate and reducing the energy consumption in the harmless treatment process of the electrolytic manganese slag, has simple operation and is suitable for popularization.
Description
Technical Field
The utility model belongs to the technical field of industrial solid waste disposal, and particularly relates to an electrolytic manganese slag circulating alkali washing harmless treatment system.
Background
The electrolytic manganese slag is filter residue generated by filter pressing manganese ore powder after sulfuric acid leaching in the production of metal manganese. The low grade manganese carbonate in China discharges about 7-12t wet slag per 1t electrolytic manganese produced, a large amount of electrolytic manganese slag can be produced each year, and the wet slag contains 20% -35% of new liquid. Along with the sustainable development of electrolytic manganese industry in China, continuously generated manganese slag is a great challenge for enterprise safety production and environmental protection. The 100% innocent treatment rate of the electrolytic manganese slag can reach the level requirement of clean production grade III. Therefore, it is urgent to perform innocent treatment on electrolytic manganese slag.
At present, cheap alkaline materials such as powdery quicklime and cement are mostly adopted to carry out innocent treatment on manganese slag, the powdery quicklime needs to react to generate calcium hydroxide to stabilize manganese and excite ammonia nitrogen to volatilize, and in addition, hot air needs to be assisted to effectively excite ammonia nitrogen in the manganese slag, and a large amount of unreacted lime is found to be remained in the manganese slag in experiments, so that the utilization efficiency of the lime is low, the pH value of a toxic leaching solution of the manganese slag is over 9 when the effective treatment of the ammonia nitrogen is achieved, the pH value is also required to be adjusted back, and the operation is complex.
The patent application number 202210233302.8 discloses a method for deaminizing and desulfurizing manganese slag by utilizing a rotary kiln, wherein a composite deaminizing agent and electrolytic manganese slag are placed in a mixer for stirring, waste heat of a kiln head and a hot blast furnace are utilized for heating, the mixture is treated at 200-300 ℃ to obtain deaminated slag and mixed gas, and then the mixed gas is recycled by an ammonia recycling system; the patent application number 202210231195.5 discloses a harmless treatment method and equipment for electrolytic manganese slag, which adopts a harmless process of firstly washing with water, then adding quicklime and water into the manganese slag for stirring reaction, and then adding dry fine sand for mixing treatment, wherein the quicklime is directly added into the manganese slag, the addition amount is 4-6% of the mass of the manganese slag, and after the water washing slag is directly added with 4-6% of quicklime for treatment, the pH value of toxic leaching liquid is above 11, and the harmless treatment can be achieved only by adjusting the pH value back.
Aiming at the problems, the development of the harmless treatment system which has high lime utilization rate, low energy consumption and no need of adjusting the pH value after treatment has great significance for clean production of electrolytic manganese.
Disclosure of Invention
The utility model aims to provide an electrolytic manganese slag circulating alkali washing harmless treatment system, so as to overcome the defects of low lime utilization rate, high energy consumption, complicated operation and need of adjusting back pH value after treatment during the harmless treatment of electrolytic manganese slag. The specific technical scheme is as follows:
an electrolytic manganese slag circulating alkali washing innocent treatment system, comprising: the device comprises an alkaline washing stirring tank, a first filter press, a saturated lime water stirring barrel, a lime storage tank, a second filter press, a manganese slag air drying device and an ammonia gas absorbing device;
the alkaline washing stirring tank is provided with an ammonia gas absorption port, a discharge port of the alkaline washing stirring tank is connected with a feed port of the first filter press, and an ammonia gas absorption port of the alkaline washing stirring tank is connected with the ammonia gas absorption device;
the filtrate outlet of the first filter press is connected with the liquid inlet of the saturated lime water stirring barrel, and filter residues of the first filter press are conveyed to the manganese residue air drying device;
the saturated lime water stirring barrel is provided with an aeration device and an ammonia absorption port, a feed port of the saturated lime water stirring barrel is connected with the lime storage tank, a discharge port of the saturated lime water stirring barrel is connected with a feed port of the second filter press, and an ammonia absorption port of the saturated lime water stirring barrel is connected with the ammonia absorption device;
the filtrate outlet of the second filter press is connected with the liquid inlet of the alkaline washing stirring tank, and filter residues of the second filter press are conveyed to the saturated lime water stirring tank;
the manganese slag air drying device is provided with an ammonia gas absorbing port, and the ammonia gas absorbing port of the manganese slag air drying device is connected with the ammonia gas absorbing device.
Preferably, the alkali washing stirring tank and the saturated lime water stirring tank are both provided with stirring systems.
Preferably, the first filter press and the second filter press are both plate-and-frame filter presses.
Preferably, the aeration device consists of a plurality of disc-type microporous membrane aerators with the diameter of 215mm and an air compressor, and the aeration device is arranged at the bottom of the saturated lime stirring barrel.
Preferably, the ammonia gas absorbing device is a negative pressure ammonia gas absorbing tower, and water is used as an absorbent to absorb and form ammonia water.
Preferably, the manganese slag air drying device is a workshop, a blower and a manganese slag turning device are arranged in the workshop, an exhaust port of the blower is arranged on the side wall of the workshop, an ammonia gas absorbing port connected with the ammonia gas absorbing device is arranged at the top of the workshop, and air containing ammonia gas is extracted through negative pressure.
Preferably, the manganese slag turning device is a crawler-type turning machine, and the manganese slag turning device turns back and forth to reduce ammonia nitrogen and water in slag.
Compared with the prior art, the utility model has the following beneficial effects:
1. the filtrate outlet of the second filter press is connected with the liquid inlet of the alkaline washing stirring tank, the filter residues of the second filter press contain quicklime which is not completely reacted, the quicklime is conveyed to the saturated lime water stirring tank to continuously prepare saturated lime water, and the prepared saturated lime water enters the alkaline washing stirring tank through the filtrate outlet of the second filter press and the liquid inlet of the alkaline washing stirring tank, is circularly used for alkaline washing reaction in the alkaline washing stirring tank, and does not need to add a large amount of quicklime additionally, so that the efficient utilization of lime is realized.
2. According to the aeration device of the saturated lime water stirring barrel and the manganese slag turning and throwing device in the manganese slag air drying device, ammonia nitrogen can be caused to fully escape, so that the reaction can be smoothly carried out at normal temperature, hot air is not required to be additionally assisted, and low energy consumption is realized.
3. The manganese slag subjected to filter pressing by the first filter press is further processed in the manganese slag air drying device, residual ammonia nitrogen and hydroxyl in the slag continuously react in the manganese slag air drying device to form free ammonia, and ammonia gas is volatilized, so that the pH value of the manganese slag is further reduced, the toxicity leaching pH value of the finally processed manganese slag is 8.1-8.6, and the manganese and the ammonia nitrogen reach the standard completely, and the pH value of the manganese slag does not need to be regulated back.
4. The method has the advantages of simple integral operation, low running cost and good treatment effect, and the treated manganese slag meets the requirements of class I general industrial solid waste in general industrial solid waste storage and landfill pollution control standards (GB 18599-2020), can achieve the effects of harmlessness and reduction of the manganese slag, and is suitable for popularization.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are required to be used in the description of the embodiments will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of a system for recycling alkaline washing innocent treatment of electrolytic manganese slag;
FIG. 2 is a process flow chart of the electrolytic manganese slag circulating alkali washing innocent treatment method.
The main reference numerals illustrate:
1-alkali washing stirring tank, 2-first filter press, 3-saturated lime water stirring tank, 4-lime storage tank, 5-second filter press, 6-manganese slag air drying device and 7-ammonia absorption device.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "inside", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The terms "first," "second," "third," and the like, if any, are used for descriptive purposes only and for distinguishing between technical features and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "configured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. Hereinafter, an embodiment of the present utility model will be described in accordance with its entire structure.
Examples
As shown in fig. 1, an electrolytic manganese slag circulating alkali washing innocent treatment system comprises: an alkaline washing stirring tank 1, a first filter press 2, a saturated lime water stirring barrel 3, a lime storage tank 4, a second filter press 5, a manganese slag air drying device 6 and an ammonia gas absorbing device 7. The alkali washing stirring tank 1 is connected with a first filter press 2; the first filter press 2 is respectively connected with a saturated lime water stirring barrel 3 and a manganese slag air drying device 6; the saturated lime water stirring barrel 3 is respectively connected with the lime storage tank 4 and the second filter press 2; the alkali washing stirring tank 1, the saturated lime water stirring tank 3 and the manganese slag air drying device 6 are respectively connected with the ammonia gas absorbing device 7; the second filter press 5 is connected with the alkali washing stirring tank 1.
The alkali washing stirring tank 1 is used for alkali washing reaction of electrolytic manganese slag (reaction of electrolytic manganese slag and saturated lime water). The first filter press 2 is used for solid-liquid separation of alkali wash reaction products (manganese slag and alkali wash). The saturated lime water stirring barrel 3 is used for carrying out aeration reaction to prepare saturated lime water. The lime storage tank 4 is used for storing quicklime and providing quicklime for the reaction of the saturated lime water stirring tank 3. The second filter press 5 is used for carrying out solid-liquid separation on the suspension (containing saturated lime water and alkalized slag) reacted in the saturated lime water stirring tank 3. The manganese slag air drying device 6 is used for air drying filter residues (manganese slag) of the first filter press 2 and exciting ammonia nitrogen remained in the manganese slag to escape. The ammonia gas absorbing device 7 is used for absorbing ammonia gas generated by the reaction of the alkaline washing stirring tank 1, the saturated lime water stirring tank 3 and the manganese slag air drying device 6.
Specifically, the alkaline washing stirring tank 1 is provided with an ammonia gas absorption port, the discharge port of the alkaline washing stirring tank 1 is connected with the feed inlet of the first filter press 2, and the ammonia gas absorption port of the alkaline washing stirring tank 1 is connected with the ammonia gas absorption device 7. Preferably, the alkali washing stirring tanks 1 are all provided with stirring systems.
Specifically, the filtrate outlet of the first filter press 2 is connected with the liquid inlet of the saturated lime water stirring barrel 3, and the filter residues of the first filter press 2 are conveyed to the manganese slag air drying device 6.
Specifically, the saturated lime water stirring barrel 3 is provided with an aeration device and an ammonia gas absorption port, the feed inlet of the saturated lime water stirring barrel 3 is connected with the lime storage tank 4, the discharge outlet of the saturated lime water stirring barrel 3 is connected with the feed inlet of the second filter press 5, and the ammonia gas absorption port of the saturated lime water stirring barrel 3 is connected with the ammonia gas absorption device 7. Preferably, the saturated lime water stirring tank 3 is provided with a stirring system. The aeration device consists of a plurality of disc-type microporous membrane aerators with the diameter of 215mm and an air compressor, and is arranged at the bottom of the saturated lime stirring barrel 3. The aeration device is beneficial to removing ammonia nitrogen in filtrate (alkaline washing liquid) of the first filter press 2 during preparation of saturated lime water, reduces ammonia nitrogen concentration in circulating liquid, and improves circulating washing effect.
Specifically, the filtrate outlet of the second filter press 5 is connected with the liquid inlet of the alkaline washing stirring tank 1, and the filter residues of the second filter press 5 are conveyed to the saturated lime water stirring tank 3; the filtrate separated by the second filter press 5 is saturated lime water, the saturated lime water enters the alkaline washing stirring tank 1 from the liquid inlet of the alkaline washing stirring tank 1 to continue the alkaline washing reaction of electrolytic manganese slag through the filtrate outlet of the second filter press 5, the filter residue alkaline slag (containing incompletely reacted CaO) of the second filter press 5 is conveyed to the saturated lime water stirring tank 3 to continue circulating and used for preparing the saturated lime water, and after the lime storage tank 4 adds primary quicklime into the saturated lime water stirring tank 3, the saturated lime water can be prepared by using the alkaline slag for 4-5 times independently, the requirement of the alkaline washing reaction is met, and the quicklime in the lime storage tank 4 can be efficiently utilized. Preferably, the first filter press 2 and the second filter press 5 are both plate-and-frame filter presses.
Specifically, the manganese slag air-drying device 6 is provided with an ammonia gas absorbing port, and the ammonia gas absorbing port of the manganese slag air-drying device 6 is connected with the ammonia gas absorbing device 7. The manganese slag air drying device 6 is a workshop, a blower and a manganese slag turning device are arranged in the workshop, an exhaust port of the blower is arranged at the side edge of the workshop, an ammonia gas absorbing port connected with the ammonia gas absorbing device 7 is arranged at the top of the workshop, and air containing ammonia gas is extracted through negative pressure; the manganese slag turning device is a crawler-type turning machine, the manganese slag is turned back and forth, in the turning process, residual ammonia nitrogen in the manganese slag continuously reacts with hydroxyl to form free ammonia, and the free ammonia is changed into ammonia to volatilize, so that the pH value of the manganese slag is reduced, the toxicity leaching pH value of the finally treated manganese slag reaches the standard, the pH value of the manganese slag can be not required to be called back again, and the problems that the manganese slag is unstable in callback and excessive in callback is influenced due to the limitation of mixing equipment when the pH value of the manganese slag is called back are effectively avoided. Meanwhile, the blower and the manganese slag turning and throwing device also overcome the problem that the conventional method can excite ammonia nitrogen in the manganese slag to volatilize only by assisting with hot air, and can excite ammonia to volatilize at normal temperature, thereby realizing low energy consumption.
The ammonia gas absorbing device 7 is a negative pressure ammonia gas absorbing tower, and water is used as an absorbent to absorb and form ammonia water.
As shown in fig. 2, the electrolytic manganese slag harmless treatment process by adopting the electrolytic manganese slag circulating alkali washing harmless treatment system of the utility model is as follows:
(1) Putting electrolytic manganese slag and saturated lime water into the alkaline washing stirring tank 1 according to the proportion, performing alkaline washing treatment, and stirring and reacting to obtain mixed slag slurry;
(2) Pumping the mixed slag slurry onto the first filter press 2 for filter pressing, separating filter residues from filtrate, and then conveying the filter residues into the manganese slag air drying device 6 for air drying to obtain deeply treated manganese slag; the manganese slag turning device in the manganese slag air drying device 6 can promote ammonia nitrogen to fully escape, meanwhile, after the manganese slag air drying device 6 is used for processing, residual ammonia nitrogen in slag is continuously reacted with hydroxyl to form free ammonia, and becomes ammonia to volatilize, so that the pH value of the manganese slag is further reduced, the toxicity leaching pH value of the finally processed manganese slag is 8.1-8.6, and manganese and ammonia nitrogen completely reach the standard, therefore, the pH value of the manganese slag can be effectively prevented from being easily caused due to the limitation of mixing equipment when the pH value of the manganese slag is regulated, and the problem that the stability of manganese is influenced due to excessive regulation is effectively avoided.
(3) Pumping filtrate of the first filter press 2 into the saturated lime water stirring barrel 3, adding quicklime in a lime storage tank 4 into the saturated lime water stirring barrel 3, stirring and aerating for reaction to form saturated lime water, pumping lime-containing suspension onto the second filter press 5 for filter pressing to obtain saturated lime water as filtrate, and obtaining filter residues as alkalization slag; the aeration device of the saturated lime water stirring barrel 3 can promote the ammonia nitrogen to fully escape, so that the reaction can be smoothly carried out at normal temperature, hot air is not required to be additionally assisted, and low energy consumption is realized.
(4) Delivering the filtrate of the second filter press 5 to the alkaline washing stirring tank 1 in the step (1) for continuous use; conveying the alkalized slag to a saturated lime water stirring barrel 3 in the step (3) for continuous use; when saturated lime water is prepared, caO in quicklime is not fully reacted and remains in the alkalization slag, so that the alkalization slag can be continuously conveyed into the saturated lime water stirring barrel 3 for the next circulation to prepare the saturated lime water, and the prepared saturated lime water is circularly used for alkaline washing reaction in the alkaline washing stirring tank 1, thereby effectively improving the lime utilization rate and reducing the treatment cost.
(5) The ammonia gas generated in the reaction process of the alkaline washing stirring tank 1, the manganese slag air drying device 6 and the saturated lime water stirring tank 3 is collected by the ammonia nitrogen absorbing device 7.
Therefore, according to the embodiment of the utility model, the harmless treatment of the electrolytic manganese slag is carried out, and the problems of low lime utilization rate, high energy consumption, complex operation and need of adjusting back the pH value after the treatment during the harmless treatment of the electrolytic manganese slag are solved. The ammonia gas recovered and volatilized by the system can be used for preparing ammonia water and returning the ammonia water to a production system, meanwhile, alkali liquor can be recycled to treat manganese slag to a better effect, the ammonia nitrogen removal rate in the manganese slag can reach more than 99%, the manganese stabilization rate can reach more than 99%, the treated manganese slag meets the requirements of class I general industrial solid waste in general industrial solid waste storage and landfill pollution control standards (GB 18599-2020), and the effects of harmlessness and reduction of the manganese slag can be achieved.
The working principle in this embodiment is described in detail below to make the person skilled in the art more aware of the present utility model:
after the electrolytic manganese slag and saturated lime water react in the alkaline washing stirring tank, the reaction slag slurry is conveyed to a first filter press for filter pressing through a discharge port of the alkaline washing stirring tank 1 and a feed port of the first filter press 2, and ammonia generated by the reaction enters an ammonia absorption device 7 through an ammonia absorption port of the ammonia absorption device.
The filtrate of the first filter press 2 is conveyed into the saturated lime water stirring barrel 3 for reaction through a filtrate outlet and a liquid inlet of the saturated lime water stirring barrel 3, and the filter residue of the first filter press 2 is collected and then conveyed to the manganese residue air drying device 6.
Quicklime in the lime storage tank enters a post-reaction through a feed inlet of the saturated lime water stirring barrel 3, reaction liquid enters the second filter press 5 from a discharge outlet of the lime water stirring barrel 3 and a feed inlet of the second filter press 5, and ammonia generated by the reaction enters an ammonia absorption device 7 from an ammonia absorption port thereof.
The filtrate of the second filter press 5 enters the alkaline washing stirring tank 1 through a filtrate outlet and a liquid inlet of the alkaline washing stirring tank 1 to continue the reaction, and the filter residues are collected and then sent into the saturated lime water stirring tank 1 to continue the reaction.
The filter residues of the first filter press 2 continue to react in the manganese slag air drying device 6, and the generated ammonia gas enters the ammonia gas absorbing device 7 through an ammonia gas absorbing port of the manganese slag air drying device 6.
In conclusion, the method has the advantages of improving the lime utilization rate in the harmless treatment process of the electrolytic manganese slag and reducing the energy consumption, is simple to operate, and is suitable for popularization.
The foregoing description of specific exemplary embodiments of the utility model has been presented for the purpose of illustration and description, but it is not intended to limit the utility model to the precise form disclosed, and it is apparent that many changes and modifications may be made in accordance with the above teachings, and while embodiments of the utility model have been shown and described, this specific embodiment is merely illustrative of the utility model and not restrictive, the particular features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner, the exemplary embodiments being selected and described for the purpose of explaining the specific principles of the utility model and its practical application, so that modifications, substitutions, variations, and various other changes may be made to the embodiments without creatively departing from the principles and spirit of the utility model as desired by those skilled in the art without departing from the scope of the patent claims.
Claims (7)
1. An electrolytic manganese slag circulating alkali washing innocent treatment system is characterized by comprising:
the device comprises an alkaline washing stirring tank, a first filter press, a saturated lime water stirring barrel, a lime storage tank, a second filter press, a manganese slag air drying device and an ammonia gas absorbing device;
the alkaline washing stirring tank is provided with an ammonia gas absorption port, a discharge port of the alkaline washing stirring tank is connected with a feed port of the first filter press, and an ammonia gas absorption port of the alkaline washing stirring tank is connected with the ammonia gas absorption device;
the filtrate outlet of the first filter press is connected with the liquid inlet of the saturated lime water stirring barrel, and filter residues of the first filter press are conveyed to the manganese residue air drying device;
the saturated lime water stirring barrel is provided with an aeration device and an ammonia absorption port, a feed port of the saturated lime water stirring barrel is connected with the lime storage tank, a discharge port of the saturated lime water stirring barrel is connected with a feed port of the second filter press, and an ammonia absorption port of the saturated lime water stirring barrel is connected with the ammonia absorption device;
the filtrate outlet of the second filter press is connected with the liquid inlet of the alkaline washing stirring tank, and filter residues of the second filter press are conveyed to the saturated lime water stirring tank;
the manganese slag air drying device is provided with an ammonia gas absorbing port, and the ammonia gas absorbing port of the manganese slag air drying device is connected with the ammonia gas absorbing device.
2. The electrolytic manganese slag circulating alkali washing innocent treatment system according to claim 1, wherein the alkali washing stirring tank and the saturated lime water stirring tank are both provided with a stirring system.
3. The electrolytic manganese slag circulating alkali washing innocent treatment system according to claim 1, wherein the first filter press and the second filter press are both plate-and-frame filter presses.
4. The electrolytic manganese slag circulating alkali washing harmless treatment system according to claim 1, wherein the aeration device consists of a plurality of disc-type microporous membrane aerators with the diameter of 215mm and an air compressor, and the aeration device is arranged at the bottom of the saturated lime water stirring barrel.
5. The electrolytic manganese slag circulating alkali washing innocent treatment system according to claim 1, wherein the ammonia gas absorbing device is a negative pressure ammonia gas absorbing tower.
6. The electrolytic manganese slag circulating alkali washing harmless treatment system according to claim 1, wherein the manganese slag air drying device is a workshop, a blower and a manganese slag turning device are arranged in the workshop, an exhaust opening of the blower is arranged on the side wall of the workshop, and an ammonia gas absorbing opening connected with the ammonia gas absorbing device is arranged at the top of the workshop.
7. The electrolytic manganese slag circulating alkali washing harmless treatment system according to claim 6, wherein the manganese slag turning device is a crawler-type turning machine.
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