CN113526635A - Method for treating uranium tailing pond percolation water by recycling neutralized precipitation slag - Google Patents

Method for treating uranium tailing pond percolation water by recycling neutralized precipitation slag Download PDF

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CN113526635A
CN113526635A CN202110992667.4A CN202110992667A CN113526635A CN 113526635 A CN113526635 A CN 113526635A CN 202110992667 A CN202110992667 A CN 202110992667A CN 113526635 A CN113526635 A CN 113526635A
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neutralization
uranium
precipitation
slag
supernatant
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丁德馨
胡南
辛馨
陈祥标
李广悦
张辉
王向荣
张兆光
王云
石涛
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FOURTH INSTITUTE OF NUCLEAR ENGINEERING OF CNNC
University of South China
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FOURTH INSTITUTE OF NUCLEAR ENGINEERING OF CNNC
University of South China
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/04—Treating liquids
    • G21F9/06—Processing
    • G21F9/10—Processing by flocculation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/006—Radioactive compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C02F2101/206—Manganese or manganese compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06—Contaminated groundwater or leachate

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
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  • Hydrology & Water Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Inorganic Chemistry (AREA)
  • Removal Of Specific Substances (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention belongs to the technical field of radioactive wastewater treatment, and provides a method for treating uranium tailing pond percolation water by recycling neutralization precipitation slag, which comprises the steps of mixing the uranium tailing pond percolation water to be treated with alkaline solution, carrying out 1 st round of neutralization precipitation reaction, and separating to obtain supernatant and the neutralization precipitation slag; discharging supernatant after neutralization treatment; reserving the part of the neutralized precipitation slag for carrying out the next round of neutralization and precipitation reaction, wherein the volume ratio of the reserved neutralized precipitation slag to the seepage water of the uranium tailing pond to be treated in the next round of neutralization and precipitation reaction is 1 (5-50); the rest part neutralizes the sediment slag to be subjected to filter pressing treatment; mixing the seepage water of the uranium tailing pond to be treated with an alkaline solution and the reserved neutralization precipitation slag, carrying out neutralization precipitation reaction in the 2 nd round, and separating to obtain supernatant and the neutralization precipitation slag; and (4) neutralizing the precipitation slag, and respectively carrying out retention and filter pressing treatment by repeating the scheme. The results show that the uranium and manganese concentrations in the supernatant after the 30 th round of circulation are 0.04mg/L and 0.53mg/L respectively.

Description

Method for treating uranium tailing pond percolation water by recycling neutralized precipitation slag
Technical Field
The invention relates to the technical field of radioactive wastewater treatment, in particular to a method for treating uranium tailing pond percolation water by recycling neutralized sediment.
Background
Under the physical, chemical and biological weathered action, uranium and manganese in the uranium tailings can be released and enter a uranium tailings reservoir, seepage water containing uranium and manganese is formed under the action of rainwater, surface runoff and subsurface runoff, and the pH value is acidic. Once the uranium and manganese in the percolation water are migrated to the surrounding environment, the uranium and manganese enter the human body through a food chain for enrichment, thereby posing a threat to the human health. Therefore, the removal of uranium and manganese in the uranium tailing pond percolation water is an urgent problem to be solved.
At present, the main treatment methods of uranium and manganese-containing wastewater include a chemical precipitation method, an adsorption method, an evaporation concentration method, a membrane extraction method, an electrochemical method, a biological treatment method and the like. However, the uranium tailings pond has the problems of high water consumption, complex process flow, unstable effect, long period and the like when the uranium tailings pond is treated by an adsorption method, an evaporation concentration method, a membrane extraction method, an electrochemical method, a biological treatment method and the like because the seepage water quantity of the uranium tailings pond is large, the pH value is acidic and the change range is wide, and uranium and manganese need to be removed simultaneously. The existing chemical precipitation method usually needs to add a coagulant and simultaneously needs to combine electric neutralization, and the problems of complex process flow, high cost, long period and the like exist. Therefore, a method for treating uranium tailing pond percolation water with high efficiency, simple process and low cost is needed.
Disclosure of Invention
The invention aims to provide a method for treating uranium tailing pond percolation water by recycling neutralized precipitation slag, which has the advantages of high treatment efficiency, stable circulation effect and simple process, and simultaneously removes uranium and manganese in the percolation water.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a method for treating uranium tailing pond percolation water by recycling neutralized precipitation slag, which comprises the following steps:
mixing the percolation water of a uranium tailing pond to be treated with an alkaline solution, carrying out a 1 st round of neutralization and precipitation reaction, and then separating to obtain a supernatant and neutralized precipitation slag; discharging the supernatant after neutralization treatment; reserving the neutralized precipitation slag part for carrying out the next round of neutralization and precipitation reaction, wherein the volume ratio of the reserved neutralized precipitation slag to the seepage water of the uranium tailing pond to be treated in the next round of neutralization and precipitation reaction is 1 (5-50); the rest part neutralizes the sediment slag to be subjected to filter pressing treatment;
mixing the seepage water of the uranium tailing pond to be treated with an alkaline solution and the reserved neutralization precipitation slag, carrying out neutralization precipitation reaction in the 2 nd round, and then separating to obtain supernatant and the neutralization precipitation slag; discharging the supernatant after neutralization treatment; and (3) repeating the scheme to neutralize the precipitation slag, and respectively carrying out retention and filter pressing treatment.
Preferably, the alkaline solution comprises a NaOH solution and/or a KOH solution.
Preferably, the mass concentration of the alkaline solution is 5-10%.
Preferably, the use amount of the alkaline solution is to adjust the pH value of the uranium tailing pond percolation water to 9.5-11.0.
Preferably, the time of each neutralization and precipitation reaction is 5-10 min independently.
Preferably, the volume ratio of the reserved neutralized precipitation slag to the seepage water of the uranium tailing pond to be treated in the next round is 1 (30-50).
Preferably, the supernatant fluid after neutralization treatment further comprises an ammonia nitrogen removal process before discharge.
Preferably, the concentration of uranium in the uranium tailings pond percolation water is less than or equal to 20.5 mg/L; the concentration of manganese in the uranium tailing pond percolation water is less than or equal to 7.5 mg/L.
Preferably, a filter cake and a filtrate are obtained after the filter pressing treatment, and the water content of the filter cake is less than 15%.
The invention provides a method for treating uranium tailing pond percolation water by recycling neutralized precipitation slag, which comprises the following steps: mixing the percolation water of a uranium tailing pond to be treated with an alkaline solution, carrying out a 1 st round of neutralization and precipitation reaction, and then separating to obtain a supernatant and neutralized precipitation slag; discharging the supernatant after neutralization treatment; reserving the neutralized precipitation slag part for carrying out the next round of neutralization and precipitation reaction, wherein the volume ratio of the reserved neutralized precipitation slag to the seepage water of the uranium tailing pond to be treated in the next round of neutralization and precipitation reaction is 1 (5-50); the rest part neutralizes the sediment slag to be subjected to filter pressing treatment; mixing the seepage water of the uranium tailing pond to be treated with an alkaline solution and the reserved neutralization precipitation slag, carrying out neutralization precipitation reaction in the 2 nd round, and then separating to obtain supernatant and the neutralization precipitation slag; discharging the supernatant after neutralization treatment; and (3) repeating the scheme to neutralize the precipitation slag, and respectively carrying out retention and filter pressing treatment. The uranium tailings pond percolating water and the alkaline solution are mixed for carrying out neutralization and precipitation reaction, uranium and manganese in the percolating water are recovered, and simultaneously neutralized and precipitated slag is obtained, and the generated neutralized and precipitated slag is returned to the neutralization and precipitation process to continuously treat the uranium tailings pond percolating water, so that on one hand, the generation and growth of neutralized and precipitated slag particles are facilitated, the sedimentation speed is accelerated, the treatment efficiency is improved, on the other hand, the supersaturation degree of precipitates in a liquid phase is reduced, the particle size of the neutralized and precipitated slag is increased, the solid-liquid separation is facilitated, and the uranium and the manganese in the percolating water of the uranium tailings pond are removed; supernatant generated in the neutralization and precipitation process can be directly discharged through neutralization reaction, and accumulated neutralized precipitation slag can be recycled after pressure filtration treatment. The results of the examples show that after the uranium tailings pond percolation water is treated by the method provided by the invention and circulated for 30 times, the uranium concentration in the supernatant is 0.04mg/L, the manganese concentration in the supernatant is 0.53mg/L, and the circulation effect is stable.
The method for treating the uranium tailing pond percolation water by recycling the neutralization precipitation slag has the advantages of large treatment capacity, low cost, simple process, convenience in operation and stable effect.
Detailed Description
The invention provides a method for treating uranium tailing pond percolation water by recycling neutralized precipitation slag, which comprises the following steps:
mixing the percolation water of a uranium tailing pond to be treated with an alkaline solution, carrying out a 1 st round of neutralization and precipitation reaction, and then separating to obtain a supernatant and neutralized precipitation slag; discharging the supernatant after neutralization treatment; reserving the neutralized precipitation slag part for carrying out the next round of neutralization and precipitation reaction, wherein the volume ratio of the reserved neutralized precipitation slag to the seepage water of the uranium tailing pond to be treated in the next round of neutralization and precipitation reaction is 1 (5-50); the rest part neutralizes the sediment slag to be subjected to filter pressing treatment;
mixing the seepage water of the uranium tailing pond to be treated with an alkaline solution and the reserved neutralization precipitation slag, carrying out neutralization precipitation reaction in the 2 nd round, and then separating to obtain supernatant and the neutralization precipitation slag; discharging the supernatant after neutralization treatment; and (3) repeating the scheme to neutralize the precipitation slag, and respectively carrying out retention and filter pressing treatment.
Mixing the percolation water of the uranium tailing pond to be treated with an alkaline solution, carrying out a 1 st round of neutralization and precipitation reaction, and then separating to obtain a supernatant and neutralized precipitation slag. The uranium and manganese in the percolation water are removed by mixing the percolation water of the uranium tailing pond with an alkaline solution for neutralization and precipitation reaction, and the neutralization precipitation slag which can be reused for the neutralization and precipitation reaction is obtained at the same time.
The source of the uranium tailing pond percolating water is not specially limited, and the method provided by the invention is suitable for treating the uranium tailing pond percolating water in various places. In the invention, the concentration of uranium in the uranium tailing pond percolation water is preferably less than or equal to 20.5 mg/L; the concentration of manganese in the uranium tailing pond percolation water is preferably less than or equal to 7.5 mg/L.
In the present invention, the alkaline solution preferably includes a NaOH solution and/or a KOH solution, and more preferably a NaOH solution. The uranium and manganese in the uranium tailing pond percolation water are precipitated by mixing the uranium tailing pond percolation water with an alkaline solution. In the method, after the neutralization precipitation reaction is finished, uranium in the uranium tailing pond percolation water generates sodium diuranate or potassium diuranate precipitate, and manganese in the uranium tailing pond percolation water generates manganese hydroxide precipitate.
In the present invention, the mass concentration of the alkaline solution is preferably 5 to 10%, and more preferably 5 to 8%. According to the invention, the mass concentration of the alkaline solution is preferably controlled within the range, so that the pH value of the uranium tailing pond percolation water can be conveniently adjusted.
In the invention, the use amount of the alkaline solution is preferably to adjust the pH value of the uranium tailings pond percolation water to 9.5-11.0, and more preferably to 9.5-10.0. The method adjusts the pH value of the uranium tailing pond percolation water by controlling the using amount of the alkaline solution, so that uranium and manganese in the uranium tailing pond percolation water are precipitated.
In the present invention, the 1 st round neutralization and precipitation reaction is preferably carried out under stirring. In the invention, the stirring speed is preferably 150-200 r/min, and more preferably 180-200 r/min. The invention promotes the neutralization and precipitation reaction by stirring.
After the neutralization and precipitation reaction in the 1 st round is finished, separating the product after the neutralization and precipitation reaction in the 1 st round to obtain supernatant and neutralized precipitation slag. The operation of the separation in the present invention is not particularly limited, and a solid-liquid separation method known to those skilled in the art may be employed.
In the present invention, it is preferable to further include a standing step before the separation of the product obtained in the 1 st round neutralization and precipitation reaction. In the invention, the standing time is preferably 1-15 h, more preferably 1-10 h, and most preferably 1-2 h. The method leads the uranium and manganese-containing neutralized precipitation slag to be positioned at the bottom layer through standing, and the uranium and manganese-removed supernatant to be positioned at the upper layer, so as to facilitate the subsequent separation.
After the supernatant fluid and the neutralized sediment slag are obtained, the supernatant fluid is discharged after neutralization treatment. The invention changes the supernatant from alkalinity to neutrality through neutralization treatment, and reaches the discharge standard. In the present invention, the agent for the neutralization treatment is preferably an acid. The present invention is not particularly limited in kind and concentration of the acid, and an acid known to those skilled in the art may be used.
In the invention, when the ammonia nitrogen in the uranium tailings pond percolation water does not meet the discharge standard, the ammonia nitrogen removal process is preferably further included after the supernatant is neutralized and before the discharge. The operation of the ammonia nitrogen removal process is not particularly limited in the present invention, and an ammonia nitrogen removal process known to those skilled in the art may be employed.
The invention reserves the neutralization precipitation slag part for the next round of neutralization precipitation reaction. According to the method, part of the neutralized precipitation slag is reserved, and the uranium tailing pond percolation water is continuously treated, so that the generation and growth of the precipitate are facilitated, the sedimentation speed is accelerated, the treatment efficiency is improved, the supersaturation degree of the precipitate in a liquid phase is reduced, the particle size of the precipitation slag is increased, the solid-liquid separation is facilitated, and the treatment efficiency is improved.
In the invention, the volume ratio of the reserved neutralization precipitation slag to the seepage water of the uranium tailing pond to be treated in the next round of neutralization precipitation reaction is 1 (5-50), and preferably 1 (30-50). The volume ratio of the reserved neutralization precipitation slag to the seepage water of the uranium tailing pond to be treated in the next round of neutralization precipitation reaction is controlled within the range, the proportion of the neutralization precipitation slag is too small to achieve the effect of grain-increasing precipitation, so that the grain size of the precipitation slag is too small, and the subsequent solid-liquid separation is not facilitated; the proportion of the neutralized precipitated slag is too large, the amount of the treated wastewater is too small, and the workload of solid-liquid separation is large.
The method carries out filter pressing treatment on the rest neutralized precipitation slag to obtain filtrate and filter cake.
In the invention, the equipment used for the filter pressing treatment is preferably a polypropylene chamber filter press; the pressure-bearing capacity of the polypropylene chamber filter press is preferably less than 1.5 MPa.
In the present invention, the filtrate is preferably mixed with the neutralization precipitation slag, uranium tailings pond leachate water and alkaline solution for use in the neutralization precipitation reaction. The method prevents the uranium and manganese in the filtrate from polluting the environment by reusing the filtrate for the neutralization precipitation reaction.
In the present invention, the water content of the filter cake is preferably < 15%. According to the invention, the water content of the filter cake is preferably controlled within the range, so that uranium and manganese can be recovered.
The filter cake is preferably subjected to recovery treatment in the invention. The invention preferably recovers uranium and manganese in the filter cake by recycling the filter cake. According to the invention, the filter cake is preferably leached firstly and then is recycled. In the present invention, the leaching is preferably performed by stirring; the recovery process is preferably an ion exchange process.
After the 1 st round of neutralization and precipitation reaction is finished, mixing the percolation water of the uranium tailing pond to be treated with an alkaline solution and reserved neutralization precipitation slag, carrying out the 2 nd round of neutralization and precipitation reaction, and then separating to obtain a supernatant and the neutralization precipitation slag; discharging the supernatant after neutralization treatment; and (3) repeating the scheme to neutralize the precipitation slag, and respectively carrying out retention and filter pressing treatment.
In the present invention, the process of the 2 nd round neutralization and precipitation reaction is the same as that of the 1 st round neutralization and precipitation reaction, and is not described in detail.
In the invention, the time of each neutralization and precipitation reaction is preferably 5-10 min independently, and more preferably 10min independently. In the invention, after each neutralization and precipitation reaction is finished, the precipitation rate of uranium and manganese in the infiltration water of the uranium tailing pond is preferably more than 90 percent; the concentration of uranium in the supernatant is preferably less than 0.3 mg/L; the concentration of manganese in the supernatant is preferably < 2 mg/L.
In the practical application process, the method for treating the uranium tailing pond percolation water by recycling the neutralized precipitation slag preferably comprises the following steps:
adding the uranium tailing pond percolation water and an alkaline solution into a stirring tank, and carrying out neutralization and precipitation reaction in the 1 st round to obtain mixed slurry;
pumping the mixed slurry into a thickening tank for clarification to obtain supernatant and neutralized sediment;
neutralizing the supernatant and then discharging;
returning the neutralized precipitation slag part to the stirring tank, adding infiltration water and an alkaline solution of a uranium tailing pond, carrying out neutralization and precipitation reaction in the 2 nd round, and carrying out circulating neutralization and precipitation according to the step;
when the neutralized precipitation slag in the thickening tank exceeds one plate frame, part of the neutralized precipitation slag is used for circulating neutralization precipitation reaction, and the rest of the neutralized precipitation slag is subjected to filter pressing treatment by adopting a polypropylene chamber filter press to obtain filtrate and a filter cake;
returning the filtrate to the stirring tank to participate in a neutralization precipitation reaction;
and leaching the filter cake and then recovering.
According to the method, the uranium tailings pond percolating water and the alkaline solution are mixed for carrying out a neutralization precipitation reaction, uranium and manganese in the percolating water are removed, and simultaneously, the neutralized precipitation slag is obtained, and then the generated neutralized precipitation slag is returned to the neutralization precipitation reaction process to continuously treat the uranium tailings pond percolating water, so that the sedimentation speed of the precipitation slag is accelerated, the treatment efficiency is improved, the particle size of the precipitation slag is increased, solid-liquid separation is facilitated, and the uranium and manganese in the percolating water of the uranium tailings pond are efficiently removed; supernatant generated in the process of the neutralization precipitation reaction can be directly discharged through the neutralization reaction, and uranium and manganese in the accumulated neutralization precipitation slag can be recycled after the accumulated neutralization precipitation slag is subjected to pressure filtration treatment.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
And (3) percolating water I of a certain uranium tailing pond, wherein the pH value is 6.61, the uranium concentration is 0.61mg/L, and the manganese concentration is 2.25 mg/L. Adding 500mL of percolating water into a 1000mL beaker, adding 1.50mL of 5% NaOH solution by mass concentration to increase the pH value to 10.01, stirring at the speed of 180r/min for 10min, and standing for 2h to obtain a supernatant and a neutralized precipitate; 10mL of supernatant was taken to analyze the uranium concentration, manganese concentration and pH, and the 1 st round of neutralization and precipitation reaction was completed. And then pouring out the supernatant, adding 40mL of the neutralized precipitation slag into 500mL of the same uranium tailing pond percolation water (the volume ratio of the reserved neutralized precipitation slag to the uranium tailing pond percolation water is 1:12.5), adding 0.70mL of 5% NaOH solution by mass concentration to increase the pH value to 9.99, stirring for 10min at the speed of 180r/min, standing for 2h, taking the supernatant, analyzing the uranium concentration, the manganese concentration and the pH value, and finishing the 2 nd round of neutralization and precipitation reaction. And (3) carrying out 3 rd to 30 th neutralization and precipitation reactions according to the method of 2 nd round neutralization and precipitation reactions, wherein the test parameters and the test results are shown in the table 1, and supernatant generated in the neutralization and precipitation reactions is directly discharged after being neutralized by acid. And in the process of the neutralization precipitation reaction, carrying out filter pressing treatment on redundant neutralization precipitation slag, reusing the filtrate generated after the filter pressing treatment for the neutralization precipitation reaction, and leaching and recycling the generated filter cake to obtain uranium and manganese.
Table 1 example 1 experimental parameters and experimental results for the treatment of uranium tailings pond percolation water by cyclic neutralization precipitation
Figure BDA0003232946640000071
Figure BDA0003232946640000081
Example 2
And (3) percolating water II of a certain uranium tailing pond, wherein the pH value is 6.56, the uranium concentration is 0.39mg/L, and the manganese concentration is 6.56 mg/L. Adding 500mL of percolating water into a 1000mL beaker, adding 1.70mL of 5% NaOH solution by mass concentration to increase the pH value to 10.01, stirring at the speed of 180r/min for 10min, and standing for 2h to obtain a supernatant and a neutralized precipitate; 10mL of supernatant was taken to analyze the uranium concentration, manganese concentration and pH, and the 1 st round of neutralization and precipitation reaction was completed. And then pouring out the supernatant, adding 35mL of the neutralized precipitation slag into 500mL of the same uranium tailing pond percolation water (the volume ratio of the reserved neutralized precipitation slag to the uranium tailing pond percolation water is 1:14.3), adding 1.50mL of 5% NaOH solution by mass concentration to increase the pH value to 9.99, stirring at the speed of 180r/min for 10min, standing for 2h, taking the supernatant, analyzing the uranium concentration, the manganese concentration and the pH value, and finishing the 2 nd round of neutralization and precipitation reaction. And (3) carrying out 3 rd to 30 th neutralization and precipitation reactions according to the method of 2 nd round neutralization and precipitation reactions, wherein the test parameters and the test results are shown in the table 2, and supernatant generated in the neutralization and precipitation reactions is directly discharged after being neutralized by acid. And in the process of neutralization and precipitation, carrying out filter pressing treatment on redundant neutralization and precipitation slag, recycling the filtrate generated after filter pressing treatment for neutralization and precipitation reaction, and leaching and recycling the generated filter cake to obtain uranium and manganese.
Table 2 example 2 experimental parameters and experimental results for the treatment of uranium tailings pond percolation water by cyclic neutralization precipitation
Figure BDA0003232946640000091
Figure BDA0003232946640000101
Example 3
Adding NaOH solution with the mass concentration of 5% into different uranium tailing pond percolation water, stirring for 10min at the speed of 180r/min, and standing for 1h to obtain supernatant and neutralized precipitation slag; 10mL of supernatant was taken and analyzed for uranium concentration, manganese concentration and pH, and the experimental parameters and experimental results are shown in Table 3.
Table 3 test parameters and test results for example 3
Figure BDA0003232946640000102
As can be seen from Table 3, the method provided by the invention is suitable for treating uranium tailing pond percolation water with different pH values and different uranium and manganese concentrations, and has the advantages of large treatment capacity, good precipitation effect and low uranium and manganese concentrations in supernate.
The embodiment shows that the method for treating the uranium tailing pond percolation water by recycling the neutralization precipitation slag has the advantages of large treatment capacity, simple process and stable effect, and simultaneously removes uranium and manganese in the percolation water. The method provided by the invention is adopted to treat the uranium tailing pond percolation water, and after 30 times of circulation, the uranium concentration in the supernatant is 0.04mg/L, and the manganese concentration is 0.53 mg/L.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (9)

1. A method for treating uranium tailing pond percolation water by recycling neutralized precipitation slag comprises the following steps:
mixing the percolation water of a uranium tailing pond to be treated with an alkaline solution, carrying out a 1 st round of neutralization and precipitation reaction, and then separating to obtain a supernatant and neutralized precipitation slag; discharging the supernatant after neutralization treatment; reserving the neutralized precipitation slag part for carrying out the next round of neutralization and precipitation reaction, wherein the volume ratio of the reserved neutralized precipitation slag to the seepage water of the uranium tailing pond to be treated in the next round of neutralization and precipitation reaction is 1 (5-50); the rest part neutralizes the sediment slag to be subjected to filter pressing treatment;
mixing the seepage water of the uranium tailing pond to be treated with an alkaline solution and the reserved neutralization precipitation slag, carrying out neutralization precipitation reaction in the 2 nd round, and then separating to obtain supernatant and the neutralization precipitation slag; discharging the supernatant after neutralization treatment; and (3) repeating the scheme to neutralize the precipitation slag, and respectively carrying out retention and filter pressing treatment.
2. The method of claim 1, wherein the alkaline solution comprises a NaOH solution and/or a KOH solution.
3. The method according to claim 1 or 2, wherein the alkaline solution has a mass concentration of 5 to 10%.
4. The method according to claim 1, wherein the alkaline solution is used in an amount of adjusting the pH value of the uranium tailings pond percolation water to 9.5-11.0.
5. The method according to claim 1, wherein the time of each neutralization precipitation reaction is independently 5-10 min.
6. The method according to claim 1, wherein the volume ratio of the reserved neutralized sediment slag to the next round of uranium tailings pond percolation water to be treated is 1 (30-50).
7. The method according to claim 1, further comprising a process of removing ammonia nitrogen after the supernatant neutralization treatment and before the discharge.
8. The method of claim 1, wherein the concentration of uranium in the uranium tailings pond leachate is 20.5mg/L or less; the concentration of manganese in the uranium tailing pond percolation water is less than or equal to 7.5 mg/L.
9. The method according to claim 1, wherein a filter cake and a filtrate are obtained after the filter pressing treatment, and the water content of the filter cake is less than 15%.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115798771A (en) * 2022-11-18 2023-03-14 中核第四研究设计工程有限公司 Method for stabilizing acidic associated radioactive waste residues and stabilizing medicament used by same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109607909A (en) * 2018-11-27 2019-04-12 核工业北京化工冶金研究院 A kind of high ammonia nitrogen uranium containing manganese wastewater treatment method
CN112960806A (en) * 2021-02-24 2021-06-15 南华大学 Process and equipment for full-slurry circulation grain-adding precipitation of uranium products

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109607909A (en) * 2018-11-27 2019-04-12 核工业北京化工冶金研究院 A kind of high ammonia nitrogen uranium containing manganese wastewater treatment method
CN112960806A (en) * 2021-02-24 2021-06-15 南华大学 Process and equipment for full-slurry circulation grain-adding precipitation of uranium products

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115798771A (en) * 2022-11-18 2023-03-14 中核第四研究设计工程有限公司 Method for stabilizing acidic associated radioactive waste residues and stabilizing medicament used by same
CN115798771B (en) * 2022-11-18 2024-02-23 中核第四研究设计工程有限公司 Method for stabilizing acidic associated radioactive waste residues and stabilizing agent used in method

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