CN213327401U - System for preparing urea ammonium nitrate by recycling nitric acid type waste liquid - Google Patents
System for preparing urea ammonium nitrate by recycling nitric acid type waste liquid Download PDFInfo
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- CN213327401U CN213327401U CN202021922070.XU CN202021922070U CN213327401U CN 213327401 U CN213327401 U CN 213327401U CN 202021922070 U CN202021922070 U CN 202021922070U CN 213327401 U CN213327401 U CN 213327401U
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Abstract
The utility model discloses a system for preparing urea ammonium nitrate by recycling nitric acid type waste liquid, which comprises a neutralization reaction system, a first solid-liquid separation system, an ion exchange system, a purification and impurity removal system, a second solid-liquid separation system, an evaporation system and a blending system which are connected in sequence; the technical scheme of the utility model realizes the resource recovery and the zero emission of total nitrogen of the nitric acid waste liquid.
Description
Technical Field
The utility model relates to a nitrogenous waste water treatment technical field of PCB trade, in particular to system for preparing urea ammonium nitrate by nitric acid type waste liquid resourceization.
Background
In the electronic component manufacturing industry, nitric acid is generally used for stripping off unqualified coatings and hanger metal coatings and for carrying out surface cleaning, polishing, passivation, drilling and glue etching and other treatments on objects, the content of metal or impurities in nitric acid solution is increased along with the increase of frequency of treating the objects, the treatment effect is reduced, and nitric acid type waste liquid, such as tin-stripping waste nitric acid, copper nitrate waste liquid, nickel-stripping nitric acid, waste nitric acid and other waste liquid, is discharged.
The concentration of free acid in the nitric acid type waste liquid is generally more than 1.5mol/L, and the nitric acid type waste liquid contains a large amount of metal ions, such as 40-100 g/L of copper in the nitric acid type stripping and hanging tool waste liquid, 60-100 g/L of tin in the nitric acid type tin stripping waste liquid, 3-6g/L of iron and 15-40g/L of copper. The existing treatment system mainly aims at the recovery of metal ions in waste liquid, nitrate wastewater is formed by nitrogen resources of the waste liquid, the subsequent treatment cost is high, and the waste of the nitrogen resources is caused.
Aiming at nitric acid type waste liquid, the existing treatment process mainly focuses on the recovery of metal and nitric acid or the regeneration of the waste liquid, mainly relates to equipment for extracting copper by electrolysis, a regeneration and reuse device, a device for recovering nitric acid by heating and evaporation and the like, and all the devices and systems can realize the recovery of copper or nitric acid, but have the defects of nitrogen oxide generation, high energy consumption, difficult solid-liquid separation and the like.
Accordingly, the prior art is deficient and needs improvement.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a system for nitric acid type waste liquid resourceful preparation urea ammonium nitrate aims at realizing the resourceful recovery of nitric acid type waste liquid, total nitrogen zero release.
In order to achieve the purpose, the system for preparing urea ammonium nitrate by recycling nitric acid type waste liquid comprises a neutralization reaction system, a first solid-liquid separation system, an ion exchange system, a purification and impurity removal system, a second solid-liquid separation system, an evaporation system and a blending system which are sequentially connected;
the neutralization reaction system is used for carrying out acid-base neutralization on the nitric acid type waste liquid, and comprises a neutralization reaction kettle, and the neutralization reaction kettle is used for adding the nitric acid type waste liquid and a neutralizing agent;
the first solid-liquid separation system is used for carrying out solid-liquid separation on reaction liquid generated by the neutralization reaction system;
the ion exchange system is used for removing metal ions from the separation liquid generated by the first solid-liquid separation system and comprises an ion exchange column;
the purification and impurity removal system is used for further removing impurity ions and organic matters from the exchange liquid generated by the ion exchange system, and comprises an impurity removal reaction kettle, wherein a heavy metal trapping agent and an adsorbent are added into the impurity removal reaction kettle;
the second solid-liquid separation system is used for carrying out solid-liquid separation on the purified liquid generated by the purification and impurity removal system;
the evaporation system is used for evaporating the separation liquid generated by the second solid-liquid separation system and comprises an evaporator;
the preparation system is used for carrying out urea ammonium nitrate preparation on concentrated solution generated by the evaporation system, and comprises a preparation reaction kettle, and urea is added into the preparation reaction kettle.
Preferably, the first solid-liquid separation system and the second solid-liquid separation system comprise a centrifuge and a filter press.
Preferably, the neutralization reaction system further comprises a neutralizer elevated tank and a nitric acid type waste liquid storage tank, wherein the neutralizer elevated tank is connected with the neutralization reaction kettle and is used for adding a neutralizer into the neutralization reaction kettle, and the nitric acid type waste liquid storage tank is used for adding a nitric acid type waste liquid into the neutralization reaction kettle.
Preferably, the neutralizing agent comprises ammonia water and liquid ammonia.
Preferably, the separation liquid of the first solid-liquid separation system sequentially passes through a filtrate transfer tank and a bag filter and enters the ion exchange column, and the exchange liquid of the ion exchange column enters the impurity removal reaction kettle through an exchange liquid temporary storage tank.
Preferably, the purification and impurity removal system further comprises a heavy-catching agent elevated tank and a spiral feeding device, wherein the heavy-catching agent elevated tank is connected with the impurity removal reaction kettle and is used for adding a heavy metal catching agent into the impurity removal reaction kettle, and the spiral feeding device is used for adding an adsorbent into the impurity removal reaction kettle.
Preferably, the adsorbent comprises activated carbon, molecular sieves, zeolites.
Preferably, the evaporator comprises a single-effect evaporator, a three-effect evaporator and an MVR evaporator, and the concentrated solution generated by the evaporator enters the blending reaction kettle through a concentrated solution transfer tank.
Preferably, a liquid outlet of the blending reaction kettle is connected with a finished product storage tank.
Preferably, the neutralization reaction system, the first solid-liquid separation system, the ion exchange system, the purification and impurity removal system, the second solid-liquid separation system, the evaporation system and the blending system are all connected through pumps.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the system has the characteristics of wide application range, universality for treatment of nitric acid stripping rack waste liquid, nitric acid type tin stripping waste water, nitric acid type nickel stripping waste water and nitric acid waste water, small equipment investment, low treatment cost and the like.
2. The system can effectively recover metal and nitrogen resources in the nitric acid wastewater, and realizes zero emission of total nitrogen in the treatment process of the nitric acid wastewater.
3. The system realizes the recovery of nitrogen resources in the form of urea ammonium nitrate solution products, and compared with electrolytic regeneration equipment, the whole treatment system has the advantages of small evaporation capacity, low energy consumption, low wastewater treatment cost, and no secondary pollution of the resource system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of the system of the present invention;
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
Referring to fig. 1, the system for preparing urea ammonium nitrate by recycling nitric acid type waste liquid includes a neutralization reaction system, a first solid-liquid separation system 2, an ion exchange system, a purification and impurity removal system, a second solid-liquid separation system 5, an evaporation system, and a blending system, which are connected in sequence;
the neutralization reaction system is used for carrying out acid-base neutralization on the nitric acid type waste liquid, the neutralization reaction system comprises a neutralization reaction kettle 1, and the neutralization reaction kettle 1 is used for adding the nitric acid type waste liquid and a neutralizing agent;
the first solid-liquid separation system 2 is used for carrying out solid-liquid separation on reaction liquid generated by the neutralization reaction system;
the ion exchange system is used for removing metal ions from the separation liquid generated by the first solid-liquid separation system 2 and comprises an ion exchange column 3;
the purification and impurity removal system is used for further removing impurity ions and organic matters from exchange liquid generated by the ion exchange system, and comprises an impurity removal reaction kettle 4, wherein a heavy metal trapping agent and an adsorbent are added into the impurity removal reaction kettle 4;
the second solid-liquid separation system 5 is used for carrying out solid-liquid separation on the purified liquid generated by the purification and impurity removal system;
the evaporation system is used for evaporating the separation liquid generated by the second solid-liquid separation system 5 and comprises an evaporator 6;
the blending system is used for blending urea ammonium nitrate for concentrated liquid generated by the evaporation system, and comprises a blending reaction kettle 7, and urea is added into the blending reaction kettle 7.
Further, the first solid-liquid separation system 2 and the second solid-liquid separation system 5 include a centrifuge and a filter press.
Further, the neutralization reaction system further comprises a neutralizer elevated tank 11 and a nitric acid type waste liquid storage tank 12 which are connected with the neutralization reaction kettle 1, wherein the neutralizer elevated tank 11 is used for adding a neutralizer into the neutralization reaction kettle 1, and the nitric acid type waste liquid storage tank 12 is used for adding nitric acid type waste liquid into the neutralization reaction kettle 1.
Further, the neutralizing agent comprises ammonia water and liquid ammonia.
Further, the separation liquid of the first solid-liquid separation system 2 sequentially passes through a filtrate transfer tank 21 and a bag filter 22 and enters the ion exchange column 3, and the exchange liquid of the ion exchange column 3 enters the impurity removal reaction kettle 4 through an exchange liquid temporary storage tank 31.
Further, the purification and impurity removal system further comprises a recapture agent elevated tank 41 and a spiral feeding device 42, wherein the recapture agent elevated tank 41 is connected with the impurity removal reaction kettle 4, the recapture agent elevated tank 41 is used for adding a heavy metal capture agent into the impurity removal reaction kettle 4, and the spiral feeding device 42 is used for adding an adsorbent into the impurity removal reaction kettle 4.
Further, the adsorbent comprises activated carbon, molecular sieve and zeolite.
Further, the evaporator 6 comprises a single-effect evaporator, a three-effect evaporator and an MVR evaporator, and the concentrated solution generated by the evaporator 6 enters the blending reaction kettle 7 through a concentrated solution transfer tank 61.
Further, a liquid outlet of the blending reaction kettle 7 is connected with a finished product storage tank 8.
Further, the neutralization reaction system, the first solid-liquid separation system 2, the ion exchange system, the purification and impurity removal system, the second solid-liquid separation system 5, the evaporation system and the blending system are all connected through pumps.
Specifically, the process for preparing urea ammonium nitrate by the system comprises the following steps:
it should be noted that the content of free nitric acid in the traditional deplating nitric acid type waste liquid is usually more than or equal to 1.0mol/L, the nitric acid type waste liquid is quantitatively pumped from a nitric acid type waste liquid storage tank 12 to a neutralization reaction kettle 1 according to the amount required by production, a neutralizer is quantitatively added into the neutralization reaction kettle 1 through a neutralizer head tank 11, the pH in the neutralization reaction kettle 1 is controlled to be 5.0-6.0, the discharging is performed after stirring reaction is performed for 30-60min, and the chemical principle in the reaction process is as follows:
HNO3+NH3·H2O＝NH4NO3+H2O
M(NO3)n+n NH3·H2O＝M(OH)n↓+n NH4NO3
and (3) pumping the reaction liquid generated by the neutralization reaction kettle 1 to a first solid-liquid separation system 2 for solid-liquid separation, and uniformly collecting filter residues which can be further prepared into salt products of corresponding metal ions or delivered to a unit with treatment qualification for treatment. The separated liquid enters a filtrate transfer tank 21 for temporary storage.
The separation liquid in the filtrate transfer tank 21 is filtered by suspended particles or mechanical impurities through a bag filter 22, enters an ion exchange column 3 for resin adsorption, and enters an exchange liquid temporary storage tank 31 for temporary storage after metal ions remaining in the neutralization reaction are removed. The chemical principle of the ion exchange process is as follows:
M2++2HR＝MR2+2H+
the exchange liquid in the exchange liquid temporary storage tank 31 is quantitatively pumped into an impurity removal reaction kettle 4, meanwhile, a heavy metal capturing agent is added into the impurity removal reaction kettle 4 through a heavy capturing agent head tank 41, an adsorbent is added through a spiral feeding device 42, impurity ions and organic matters are further removed, stirring reaction is carried out, after the reaction is finished, the purified liquid is pumped into a second solid-liquid separation system 5 for solid-liquid separation, filter residues are collected and periodically delivered to a unit with relevant waste treatment quality for treatment, and the separated liquid enters a purified liquid storage tank 51. The chemical principle of purification and impurity removal is as follows:
M2++S2－＝MS↓
and (3) pumping the separation liquid in the purified liquid storage tank 51 into the evaporator 6 for evaporation concentration treatment, detecting the components of the material, discharging the material to the blending reaction kettle 7 after reaching the required indexes, adding urea according to the requirement of the urea ammonium nitrate solution product for blending, and pumping the finished product to the finished product storage tank 8 after the reaction is finished. The chemical principle of the urea ammonium nitrate preparation is as follows:
CO(NH2)2+NH4NO3→CO(NH2)2·NH4NO3
the nitric acid type wastewater can be resourced into urea ammonium nitrate solution products through the treatment of the system, wherein the total nitrogen is 31.0%, the amide nitrogen is 16.2%, the nitrate nitrogen is 7.5%, and the ammonium nitrogen is 7.3%. Meets the relevant index requirements of agricultural standard NY 2670-2015 urea ammonium nitrate solution.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A system for preparing urea ammonium nitrate by recycling nitric acid type waste liquid is characterized by comprising a neutralization reaction system, a first solid-liquid separation system, an ion exchange system, a purification and impurity removal system, a second solid-liquid separation system, an evaporation system and a blending system which are sequentially connected;
the neutralization reaction system is used for carrying out acid-base neutralization on the nitric acid type waste liquid, and comprises a neutralization reaction kettle, and the neutralization reaction kettle is used for adding the nitric acid type waste liquid and a neutralizing agent;
the first solid-liquid separation system is used for carrying out solid-liquid separation on reaction liquid generated by the neutralization reaction system;
the ion exchange system is used for removing metal ions from the separation liquid generated by the first solid-liquid separation system and comprises an ion exchange column;
the purification and impurity removal system is used for further removing impurity ions and organic matters from the exchange liquid generated by the ion exchange system, and comprises an impurity removal reaction kettle, wherein the impurity removal reaction kettle is used for adding a heavy metal trapping agent and an adsorbent;
the second solid-liquid separation system is used for carrying out solid-liquid separation on the purified liquid generated by the purification and impurity removal system;
the evaporation system is used for evaporating the separation liquid generated by the second solid-liquid separation system and comprises an evaporator;
the preparation system is used for carrying out urea ammonium nitrate preparation on concentrated solution generated by the evaporation system, and comprises a preparation reaction kettle, and urea is added into the preparation reaction kettle.
2. The system for preparing urea ammonium nitrate by recycling nitric acid type waste liquid according to claim 1, wherein the first solid-liquid separation system and the second solid-liquid separation system comprise a centrifuge and a filter press.
3. The system for preparing urea ammonium nitrate by recycling nitric acid type waste liquid as claimed in claim 1, wherein the neutralization reaction system further comprises a neutralizer elevated tank and a nitric acid type waste liquid storage tank, the neutralizer elevated tank is connected with the neutralization reaction kettle and is used for adding a neutralizer into the neutralization reaction kettle, and the nitric acid type waste liquid storage tank is used for adding nitric acid type waste liquid into the neutralization reaction kettle.
4. The system for recycling nitric acid type waste liquid to prepare urea ammonium nitrate according to claim 3, wherein the neutralizing agent comprises ammonia water or liquid ammonia.
5. The system for preparing urea ammonium nitrate by recycling nitric acid type waste liquid as claimed in claim 1, wherein the separation liquid of the first solid-liquid separation system sequentially passes through a filtrate transfer tank and a bag filter and enters the ion exchange column, and the exchange liquid of the ion exchange column passes through an exchange liquid temporary storage tank and enters the impurity removal reaction kettle.
6. The system for preparing urea ammonium nitrate by recycling nitric acid type waste liquid as claimed in claim 1, wherein the purification and impurity removal system further comprises a recapture agent head tank and a spiral feeding device, the recapture agent head tank is connected with the impurity removal reaction kettle, the recapture agent head tank is used for adding a heavy metal capture agent into the impurity removal reaction kettle, and the spiral feeding device is used for adding an adsorbent into the impurity removal reaction kettle.
7. The system for preparing urea ammonium nitrate by recycling nitric acid type waste liquid as claimed in claim 6, wherein the adsorbent comprises activated carbon or molecular sieve or zeolite.
8. The system for preparing urea ammonium nitrate by recycling nitric acid type waste liquid as claimed in claim 1, wherein the evaporator comprises a single-effect evaporator, a three-effect evaporator and an MVR evaporator, and the concentrated solution generated by the evaporator enters the blending reaction kettle through a concentrated solution transfer tank.
9. The system for preparing urea ammonium nitrate by recycling nitric acid type waste liquid as claimed in claim 1, wherein a liquid outlet of the blending reaction kettle is connected with a finished product storage tank.
10. The system for preparing urea ammonium nitrate by recycling nitric acid type waste liquid according to any one of claims 1 to 9, wherein the neutralization reaction system, the first solid-liquid separation system, the ion exchange system, the purification and impurity removal system, the second solid-liquid separation system, the evaporation system and the blending system are connected through a pump.
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| CN202021922070.XU CN213327401U (en) | 2020-09-03 | 2020-09-03 | System for preparing urea ammonium nitrate by recycling nitric acid type waste liquid |
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| CN202021922070.XU CN213327401U (en) | 2020-09-03 | 2020-09-03 | System for preparing urea ammonium nitrate by recycling nitric acid type waste liquid |
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Address after: 518000 101, maozhouhe industrial complex, Langxia community, Songgang street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Xinghe environment Co.,Ltd. Address before: No.01-03, B2 / F, building 2, Shenzhen Bay science and technology ecological park, 1809 Shahe West Road, high tech community, Yuehai street, Nanshan District, Shenzhen, Guangdong 518000 Patentee before: SHENZHEN STARIVER ENVIRONMENT TECHNOLOGY Co.,Ltd. |