CN203845906U - High ammonia-nitrogen wastewater resource utilization device for wet-method rear earth metallurgy - Google Patents
High ammonia-nitrogen wastewater resource utilization device for wet-method rear earth metallurgy Download PDFInfo
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- CN203845906U CN203845906U CN201420213778.6U CN201420213778U CN203845906U CN 203845906 U CN203845906 U CN 203845906U CN 201420213778 U CN201420213778 U CN 201420213778U CN 203845906 U CN203845906 U CN 203845906U
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- 239000002351 wastewater Substances 0.000 title claims abstract description 175
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000005272 metallurgy Methods 0.000 title abstract description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 167
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 84
- 238000004064 recycling Methods 0.000 claims abstract description 18
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
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- 238000012545 processing Methods 0.000 claims description 15
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 12
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 6
- 239000000460 chlorine Substances 0.000 claims description 6
- 229910052801 chlorine Inorganic materials 0.000 claims description 6
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- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 17
- 150000002910 rare earth metals Chemical class 0.000 description 17
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- 230000000694 effects Effects 0.000 description 9
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 241001062472 Stokellia anisodon Species 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 4
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- UPLPHRJJTCUQAY-WIRWPRASSA-N 2,3-thioepoxy madol Chemical compound C([C@@H]1CC2)[C@@H]3S[C@@H]3C[C@]1(C)[C@@H]1[C@@H]2[C@@H]2CC[C@](C)(O)[C@@]2(C)CC1 UPLPHRJJTCUQAY-WIRWPRASSA-N 0.000 description 1
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Abstract
The utility model discloses a high ammonia-nitrogen wastewater resource utilization device for wet-method rear earth metallurgy. The device is characterized by comprising a wastewater pre-treatment unit, an ammonia still recycling unit, a heat exchange unit and a comprehensive treatment unit, wherein the wastewater pre-treatment unit is used for alkalizing, precipitating and filtering high ammonia-nitrogen wastewater; the ammonia still recycling unit is connected with the wastewater pre-treatment unit and used for reclaiming ammonia in the wastewater to prepare 13-20% stronger ammonia water; the heat exchange unit is provided with a wastewater preheater, the heat exchange pipe of the wastewater preheater is connected with the wastewater pre-treatment unit, the cylinder inlet of the wastewater preheater is connected with the ammonia still recycling unit; the comprehensive treatment unit is connected with the cylinder outlet of the wastewater preheater and used for deep treatment of wastewater drained into a wastewater treatment tank, and the ammonia-nitrogen concentration of the treated draining wastewater is less than or equal to 10ppm. By adopting the high ammonia-nitrogen wastewater resource utilization device, the resource utilization of high ammonia-nitrogen wastewater can be over 95 percent, the treatment energy consumption can be reduced, the equipment scaling time can be prolonged, and heat pollution of drained wastewater can be reduced.
Description
Technical field
The utility model relates to field of waste water treatment, relates in particular to a kind of Rare Earths and smelts high ammonia-nitrogen wastewater resource utilization device.
Background technology
Rare earth material is being brought into play indispensable keying action in emerging green energy resource technology of modern times, new and high technology and national defence system, as electromobile, aerogenerator, illumination and demonstration, computer hard disc driver, mobile communication, missile guidance, intelligent bomb.Claim in the world these technology for " rare earth dependency technology ", do not have other materials to substitute, so rare earth material becomes the technology of realization, the indispensable strategic materials of rebuilding traditional industry.Rare-earth industry develops rapidly, and industry size constantly expands, but in fast-developing, also has many problems, as low in ecotope havoc, comprehensive utilization of resources degree etc.
Ammonia nitrogen is the principal pollutant of rare earth metallurgy, and such waste water is the main waste water producing in rare-earth wet method metallurgical process, accounts for 60% ~ 70% of Rare Earth Enterprises waste water total amount, as long as relate to rare-earth wet method metallurgy, nearly all will produce ammonia nitrogen waste water.At present, China most of rare-earth smelting enterprise is because the restriction of wastewater processing technology level and processing cost is faced with serious environmental protection pressure, only there is Some Enterprises only to high-concentration ammonia nitrogenous wastewater, to adopt simple evaporating, concentrating and crystallizing technique to reclaim ammonium chloride, service life of equipment is short, energy consumption is high, working cost is high, simultaneously because pre-treatment is not thorough, the ammonium chloride product purity reclaiming is low, deficiency in economic performance, and enterprise operation enthusiasm is not high; On the other hand, for the middle Low Concentration Ammonia Containing Wastewater in rare-earth wet method smelting wastewater, most of enterprise only simple feeding lime directly discharges after regulating pH, ecotope is caused to great pollution, also do not consider the relevant report of the recovery of rare-earth wet method smelting wastewater resource and waste water zero-discharge technology at present.
High ammonia-nitrogen wastewater due to the generation of rare-earth smelting industry, there is high chlorine root, high ammonia amount, high salinity, strongly-acid, but the feature that resource recovery value is high, makes rare-earth smelting enterprise face the problem that once investment is large, working cost is high, has seriously restricted the development of industry.Traditional ammonia nitrogen waste water treatment method is as air stripping method, ammonia still process method, rectification method, biological nitration-denitrification method etc., the problems such as these methods exist secondary pollution, energy consumption is high, processing power is limited, the easy crystallization scale effect of device interior operation, and be difficult to reclaim ammonia resource.Therefore, need badly for rare-earth smelting industry waste water characteristic, develop green, efficient resource treatment technique.
Utility model content
The utility model embodiment technical problem to be solved is, provide a kind of Rare Earths to smelt high ammonia-nitrogen wastewater resource utilization device, the ammonia nitrogen waste water of bi-level treatment different concns, high ammonia-nitrogen wastewater recycling rate is reached more than 95%, and reduced processing energy consumption, extend the equipment scaling time, reduced the thermal pollution of waste discharge.
In order to solve the problems of the technologies described above, the utility model embodiment provides a kind of Rare Earths to smelt high ammonia-nitrogen wastewater resource utilization device, comprising:
Wastewater Pretreatment unit, for to alkalizing containing high ammonia-nitrogen wastewater, precipitation and filtration treatment;
Ammonia still recycling unit, is connected with described Wastewater Pretreatment unit, for reclaiming the ammonia of waste water, makes 13% ~ 20% strong aqua;
Heat exchange unit, is provided with waste water preheater, and the heat transfer tube of described waste water preheater is connected with described Wastewater Pretreatment unit, and the cylindrical shell import of described waste water preheater is connected with described ammonia still recycling unit;
Comprehensive treating process unit, is connected with the cylindrical shell outlet of described waste water preheater, for carrying out advanced treatment to entering the waste water of purification tank for liquid waste, and the ammonia nitrogen in waste water concentration≤10ppm of discharge after processing.
Improvement as such scheme, described Wastewater Pretreatment unit comprises: collecting tank, the first lift pump, line mixer, the first stirred tank, chamber filter press, the second stirred tank, the second lift pump, caustic soda throwing device, PAM throwing device, described collecting tank, described the first lift pump, described line mixer, described the first stirred tank, described chamber filter press, described the second stirred tank and described the second lift pump are connected successively by pipeline, described caustic soda throwing device is connected with the pipeline that described the first lift pump is communicated with described collecting tank, described PAM throwing device is connected with described line mixer.
As the improvement of such scheme, described Wastewater Pretreatment unit is also provided with accident pool, and described accident pool is connected with described collecting tank.
Improvement as such scheme, described ammonia still recycling unit comprises: ammonia still, dephlegmator, water cooler, strong aqua condenser, ammoniacal liquor holder and the 3rd lift pump, described ammonia still top is provided with described dephlegmator, described dephlegmator is connected with described water cooler, described dephlegmator top is connected with heat transfer tube one end of described strong aqua condenser, described water cooler is connected with the cylindrical shell of described strong aqua condenser, the heat transfer tube the other end of described strong aqua condenser is connected with described ammoniacal liquor holder, at the bottom of described ammonia still tower, by described the 3rd lift pump, be connected with the heat transfer tube of described waste water preheater.
Improvement as such scheme, described comprehensive treating process unit comprises: stripper plant, break are thrown chlorine reactor and waste water condenser, described stripper plant is connected with the cylindrical shell outlet of described waste water preheater, and described stripper plant, described break throwing rate reaction tower are connected successively with the heat transfer tube of described waste water condenser, and the cylindrical shell of described waste water condenser is connected with described water cooler.
As the improvement of such scheme, described water cooler is provided with the first import, the second import, the first outlet and the second outlet, and described the first import is connected with the outlet of described dephlegmator, and described the first outlet is connected with the import of described dephlegmator;
Described the second outlet is connected with the cylindrical shell of described strong aqua, and described waste water condenser is connected with described the second import.
As the improvement of such scheme, described ammonia still adopts efficient slant-hole tray.
As the improvement of such scheme, described Rare Earths is smelted high ammonia-nitrogen wastewater resource utilization device and is also comprised pickler, and described pickler is connected with described ammonia still.
Implement the utility model embodiment, there is following beneficial effect:
Rare Earths described in the utility model is smelted high ammonia-nitrogen wastewater resource utilization device and is adopted first by the waste water of ammonia still recycling cell processing high-concentration ammonia-nitrogen, reclaim most ammonia nitrogen in waste water, after ammonia still process is processed, the low ammonia nitrogen concentration waste water of output carries out advanced treatment by comprehensive treating process unit again, concentration≤the 10ppm of waste water while making to discharge, reaches the emission standard of relevant regulations.
In addition, the utility model utilizes the low ammonia nitrogen concentration waste water that produces high temperature after ammonia still process to carry out preheating to entering the waste water of ammonia still, saves the heat energy of steam heating waste water, shortens time of ammonia distillation, realizes the heat energy recovery to waste water at the bottom of high temperature tower; And the phlegma producing by ammonia still process is as low-temperature receiver, and cooling down high-temperature waste water and strong aqua, be conducive to the multistage exchange of heat energy, realizes the maximization of energy utilization.
Moreover the utility model is provided with pickler, adopt the acid high ammonia-nitrogen wastewater of smelting after producing to add hydrochloric acid to import in ammonia still, pickling cycle is 90 ~ 120 days, far away from conventional clean method, and acid washing method step is simple, and cleaning ammonia still fouling effect is remarkable.
Finally, ammonia still described in the utility model adopts efficient slant-hole tray, can improve the separation efficiency of ammonia still process, can reduce ammonia still process hear rate again, approximately higher by 30%～40% than valve tray column sewage treatment capacity under the same conditions, by adjusting plate height, can be recycled to 15% ~ 17% strong aqua.With steam cycle heating, improve ammonia still process efficiency simultaneously, reduced production energy consumption, reduced processing cost simultaneously, energy-conservation remarkable with environment protecting.
Accompanying drawing explanation
Fig. 1 is the structural representation that the utility model Rare Earths is smelted high ammonia-nitrogen wastewater resource utilization device;
Fig. 2 is the Wastewater Pretreatment modular construction schematic diagram that the utility model Rare Earths is smelted high ammonia-nitrogen wastewater resource utilization device;
Fig. 3 is the another structural representation that the utility model Rare Earths is smelted high ammonia-nitrogen wastewater resource utilization device.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model is described in further detail.
The utility model embodiment technical problem to be solved is, provide a kind of Rare Earths to smelt high ammonia-nitrogen wastewater resource utilization device, the ammonia nitrogen waste water of bi-level treatment different concns, high ammonia-nitrogen wastewater recycling rate is reached more than 95%, and reduced processing energy consumption, extend the equipment scaling time, reduced the thermal pollution of waste discharge.
In order to solve the problems of the technologies described above, the utility model embodiment provides a kind of Rare Earths to smelt high ammonia-nitrogen wastewater resource utilization device, as shown in Figure 1, comprising:
Wastewater Pretreatment unit 1, for to alkalizing containing high ammonia-nitrogen wastewater, precipitation and filtration treatment;
Ammonia still recycling unit 2, is connected with described Wastewater Pretreatment unit 1, for reclaiming the ammonia of waste water, makes 13% ~ 20% strong aqua;
Heat exchange unit 3, is provided with waste water preheater 21, and the heat transfer tube of described waste water preheater 21 is connected with described Wastewater Pretreatment unit 1, and the cylindrical shell import of described waste water preheater 21 is connected with described ammonia still recycling unit 2;
Comprehensive treating process unit 4, is connected with the cylindrical shell outlet of described waste water preheater 21, for carrying out advanced treatment to entering the waste water of purification tank for liquid waste, and the ammonia nitrogen in waste water concentration≤10ppm of discharge after processing.
In the waste water producing in the production process of rare-earth smelting, ammonia nitrogen concentration is very high, and ammonia nitrogen is one of principal pollutant in waste discharge, take and processes 600000kg cobalt oxide as example, and in the waste water of generation, ammonia nitrogen concentration can reach 24800ppm.According to the regulation of < < rare-earth industry pollutant emission standard > >, directly in the waste water of discharge, ammonia nitrogen concentration must not surpass 10ppm, and in the waste water of discharge, ammonia nitrogen concentration must not surpass 25ppm indirectly.Traditional ammonia nitrogen waste water treatment method can adopt separately ammonia still process method to process, but because the initial ammonia nitrogen concentration of waste water is high, as made the ammonia nitrogen concentration of waste water arrive emission standard, need the time of ammonia distillation grown and larger quantity of steam, processing efficiency is low, is unfavorable for that factory processes waste water in a large number.Thus, Rare Earths described in the utility model is smelted high ammonia-nitrogen wastewater resource utilization device and is adopted the waste water of first processing high-concentration ammonia-nitrogen by ammonia still recycling unit 2, reclaim most ammonia nitrogen in waste water, after ammonia still process is processed, the low ammonia nitrogen concentration waste water of output is processed by comprehensive treating process unit 4 again, concentration≤the 10ppm of waste water while making to discharge, reaches the regulation of < < rare-earth industry pollutant emission standard > >.
In addition, Rare Earths described in the utility model is smelted high ammonia-nitrogen wastewater resource utilization device and is adopted heat exchange unit 3 to make the low ammonia nitrogen concentration waste water that produces high temperature after ammonia still process carry out preheating to entering the waste water of ammonia still, make the wastewater temperature that enters ammonia still reach 90 ℃ ~ 95 ℃, save the heat energy of steam heating waste water, shorten time of ammonia distillation, realization to high temperature tower at the bottom of the heat energy recovery of waste water, reduce the temperature of waste water at the bottom of tower simultaneously, avoid waste discharge to produce thermal pollution to environment.
As shown in Figure 2, it in figure, is described Wastewater Pretreatment unit 1, comprise: collecting tank 5, the first lift pump 6, line mixer 7, the first stirred tank 8, chamber filter press 9, the second stirred tank 10, the second lift pump 11, caustic soda throwing device 12, PAM throwing device 13, described collecting tank 5, described the first lift pump 6, described line mixer 7, described the first stirred tank 8, described chamber filter press 9, described the second stirred tank 10 and described the second lift pump 11 are connected successively by pipeline, described caustic soda throwing device 12 is connected with the pipeline that described the first lift pump 6 is communicated with described collecting tank 5, described PAM throwing device 13 is connected with described line mixer.
The waste water of high-concentration ammonia-nitrogen is when the first lift pump 6 is promoted to line mixer 7 from collecting tank 5, by volume pump, from caustic soda throwing device 12, quantitatively add caustic soda soln simultaneously, control enters wastewater pH=10 ~ 11 of ammonia still 15, makes waste water free ammonia account for the more than 80% of total ammonia; Line mixer 7 is also connected with PAM throwing device 13, and PAM throwing device 13 can add PAM to wastewater with high ammonia nitrogen concentration, and line mixer 7 rapidly and efficiently mixes wastewater with high ammonia nitrogen concentration, caustic soda soln and PAM; Mixing solutions enters in the first stirred tank 8 and stirs, fully reaction, and the finely ground particle substance reunion sedimentation in waste water, removes the metal ion easily precipitating in waste water; Waste water flow to described the second stirred tank 10 after chamber filter press 9 is held back body refuse, by entering ammonia still recycling unit 2 after the second lift pump 11 superchargings.
It should be noted that, show that by experiment the percentage ratio that different pH solution free ammonias account for total ammonia is as shown in table 1, can find out that waste water alkalescence is stronger, more be conducive to the separation of ammoniacal liquor, but reach the water surrounding of pH=12, need larger input, when wastewater pH=10 ~ 11, obtain good effect.Therefore in described Wastewater Pretreatment unit 1, be provided with caustic soda throwing device 12, before entering ammonia still, quantitatively add caustic soda soln, control wastewater pH=10 ~ 11 in ammonia still, make solution free ammonia account for the more than 80% of total ammonia, be conducive to improve efficiency and the effect of ammonia still process.
The different pH solution of table 1 free ammonia accounts for the percentage ratio of total ammonia
| pH | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| γ/% | 0.0056 | 0.0555 | 0.5525 | 5.26 | 35.71 | 84.74 | 98.23 | 99.82 |
In addition, the utility model is controlled waste water ph and is adopted caustic soda soln, and unconventional Wingdale, can reduce the degree of fouling in ammonia still tower, extends the fouling time.
It should be noted that, PAM Chinese is polyacrylamide, and polyacrylamide molecular energy and the suspended particles bridge formation absorption being scattered in solution, have extremely strong throwing out.Agglomerating sedimentation, the function of the particulate matter in realization precipitation waste water of occurring of aggregation of particles when absorption.
Preferably, described Wastewater Pretreatment unit 1 is also provided with accident pool 14, when the equipment of being used in breaks down, will treat that pretreated waste water introduces accident pool 14, again waste water is entered to collecting tank 5 from accident pool 14 after waiting eliminating accident.
As shown in Figure 3, in figure, be Rare Earths smelting high ammonia-nitrogen wastewater resource utilization device structural representation;
Wherein, ammonia still recycling unit 2 comprises: ammonia still 15, dephlegmator 16, water cooler 17, strong aqua condenser 18, ammoniacal liquor holder 19 and the 3rd lift pump 20, described ammonia still 15 tops are provided with described dephlegmator 16, and dephlegmator 16 is provided with dephlegmator outlet 16a, dephlegmator import 16b, dephlegmator top exit 16c; Strong aqua condenser 18 is provided with the first heat transfer tube import 18a, the first heat transfer tube outlet 18b, the first cylindrical shell import 18c, the first cylindrical shell outlet 18d;
Described water cooler 17 is provided with the first import 17a, the second import 17b, the first outlet 17c and the second outlet 17d, described the first import 17a is connected with described dephlegmator outlet 16a, described the first outlet 17c is connected with described dephlegmator import 16b, containing ammonia steam in dephlegmator 16 by partial condensation, by dephlegmator, export 16a and flow to water cooler 17 first import 17a; Phlegma in water cooler 17 temperature after cooling is reduced to 20 ℃ ~ 50 ℃, the utility model utilizes the relatively low phlegma of temperature to pass into strong aqua condenser 18 cylindrical shells, low-temperature receiver as strong aqua condenser 18, the temperature containing ammonia steam of leading to strong aqua condenser 18 first heat transfer tube import 18a is discharged in reduction from dephlegmator top exit 16c, arrive condensation effect, form 13% ~ 20% strong aqua.
The waste water preheater 21 that also comprises heat exchange unit 3 in Fig. 3, waste water preheater 21 comprises the second heat transfer tube import 21a, the second heat transfer tube outlet 21b, the second cylindrical shell import 21c, the second cylindrical shell outlet 21d;
The stripper plant 22 of comprehensive treating process unit 4, break are thrown chlorine reactor 23 and waste water condenser 24, and waste water condenser 24 comprises the 3rd heat transfer tube import 24a, the 3rd heat transfer tube outlet 24b, the 3rd cylindrical shell import 24c, the 3rd cylindrical shell outlet 24d.
Waste water condenser 24 the 3rd cylindrical shell import 24c that phlegma leads to comprehensive treating process unit 4 from the 18 first cylindrical shell outlets of strong aqua condenser are discharged, waste water at the bottom of further cooling high temperature tower of discharging from waste water preheater 21, be conducive to the multistage exchange of heat energy, realize the maximization of energy utilization.Phlegma is back to water cooler 17 second import 17b after the 3rd cylindrical shell outlet 24d, reaches the effect of phlegma reusable edible.
The condensation liquefied ammonia concentration of discharging from dephlegmator outlet 16a, 5% ~ 12%, does not arrive the standard of recycling, and therefore, by the first outlet 17c of water cooler 17, phlegma is back to dephlegmator import 16b, continues ammonia still process.
In addition, at the bottom of ammonia still 15 towers, wastewater temperature reaches 99 ℃ ~ 103 ℃, waste water at the bottom of high temperature tower is passed into the second heat transfer tube import 21a of waste water preheater 21 by the 3rd lift pump 20, as the thermal source of waste water preheater 21, to through pretreated waste water preheating, make the wastewater temperature that enters ammonia still 15 reach 90 ℃ ~ 95 ℃, save the heat energy of steam heating waste water, shorten time of ammonia distillation, in conjunction with the above-mentioned heat exchange utilization to phlegma, realize the multistage reuse of heat energy to waste water at the bottom of high temperature tower.
It should be noted that, ammonia nitrogen in waste water concentration≤the 100ppm that treats advanced treatment, ammonia nitrogen recovery value is not high, does not affect the rate of recovery, but the ammonia nitrogen concentration for the treatment of advanced treatment of waste water does not reach emission standard, so the utility model adopts stripper plant and break throwing chlorine reactor further to reduce ammonia-nitrogen content.
The ultimate principle of vaporizing extract process is: air is passed in waste water, change ammonia the set up vapor-liquid equilibrium relationship that is dissolved in the water, make ammonia transfer gas phase to by liquid phase, then collected or be diffused in atmosphere and go.Stripping process belongs to mass transfer process, and its impellent is the concentration difference of ammonia in wastewater concentration and Ammonia in Atmosphere gas.
In waste water after stripping is processed, ammonia nitrogen concentration is low, adopts break point chlorination to process, and the ammonia nitrogen in waste water content≤10ppm after processing, can qualified discharge.According to the utility model running condition, show that best chlorination condition is: 1mg ammonia nitrogen adds the chlorine of 9 ~ 10mg, and pH value is 6 ~ 7, and be 0.5 ~ 2h duration of contact.With this understanding, the processing rate of chlorination process reaches 90%-100%, and treatment effect is stable, is not subject to Water Temperature, and invests less.
Ammonia still 15 described in the utility model adopts efficient slant-hole tray, can improve the separation efficiency of ammonia still process, can reduce ammonia still process hear rate again, approximately higher by 30%～40% than valve tray column sewage treatment capacity under the same conditions, by adjusting plate height, can be recycled to 15% ~ 17% strong aqua.With steam cycle heating, improve ammonia still process efficiency simultaneously, reduced production energy consumption, reduced processing cost simultaneously, energy-conservation remarkable with environment protecting.
In addition, Rare Earths described in the utility model is smelted high ammonia-nitrogen wastewater resource utilization device and is also comprised pickler, and described pickler is connected with described ammonia still.Pickler adopts the acid high ammonia-nitrogen wastewater of smelting after producing to be delivered in ammonia still and recharges washing, removes fouling in tower, and pickling cycle is 90 ~ 120 days.
Smelt acid high ammonia-nitrogen wastewater pH=0.1 ~ 1 after producing, there is very strong acidity, can react with the fouling in tower, arrive the object of cleaning and descaling.
Preferably, the acid high ammonia-nitrogen wastewater after smelt producing is introduced to pickler, then to the hydrochloric acid that adds 10% in pickler, the acid solution of recharging after washing can again be led back in pickling tub and store, and can be repeatedly used.Add a hydrochloric acid and approximately can use 9 ~ 10 months, acid solution utilizes the time long.Conventional clean ammonia nitrogen sewage treatment equipment adopts the method for manually rooting out fouling, and the method security is low, efficiency slow, weak effect, and the cleaning interval is only 30 days, affects the use of ammonia nitrogen sewage treatment equipment.And the pickling cycle of the utility model pickler is 90 ~ 120 days, far surpass traditional descaling method, and acid washing method step is simple, cleaning ammonia still fouling effect is remarkable.
Last institute should be noted that; above embodiment is the restriction in order to the technical solution of the utility model to be described but not to the utility model protection domain only; although the utility model is explained in detail with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not depart from essence and the scope of technical solutions of the utility model.
Claims (8)
1. Rare Earths is smelted a high ammonia-nitrogen wastewater resource utilization device, it is characterized in that, comprising:
Wastewater Pretreatment unit, for to alkalizing containing high ammonia-nitrogen wastewater, precipitation and filtration treatment;
Ammonia still recycling unit, is connected with described Wastewater Pretreatment unit, for reclaiming the ammonia of waste water, makes 13% ~ 20% strong aqua;
Heat exchange unit, is provided with waste water preheater, and the heat transfer tube of described waste water preheater is connected with described Wastewater Pretreatment unit, and the cylindrical shell import of described waste water preheater is connected with described ammonia still recycling unit;
Comprehensive treating process unit, is connected with the cylindrical shell outlet of described waste water preheater, for carrying out advanced treatment to entering the waste water of purification tank for liquid waste, and the ammonia nitrogen in waste water concentration≤10ppm of discharge after processing.
2. Rare Earths is smelted high ammonia-nitrogen wastewater resource utilization device as claimed in claim 1, it is characterized in that, described Wastewater Pretreatment unit comprises: collecting tank, the first lift pump, line mixer, the first stirred tank, chamber filter press, the second stirred tank, the second lift pump, caustic soda throwing device, PAM throwing device, described collecting tank, described the first lift pump, described line mixer, described the first stirred tank, described chamber filter press, described the second stirred tank and described the second lift pump are connected successively by pipeline, described caustic soda throwing device is connected with the pipeline that described the first lift pump is communicated with described collecting tank, described PAM throwing device is connected with described line mixer.
3. Rare Earths is smelted high ammonia-nitrogen wastewater resource utilization device as claimed in claim 2, it is characterized in that, described Wastewater Pretreatment unit is also provided with accident pool, and described accident pool is connected with described collecting tank.
4. Rare Earths is smelted high ammonia-nitrogen wastewater resource utilization device as claimed in claim 1, it is characterized in that, described ammonia still recycling unit comprises: ammonia still, dephlegmator, water cooler, strong aqua condenser, ammoniacal liquor holder and the 3rd lift pump, described ammonia still top is provided with described dephlegmator, described dephlegmator is connected with described water cooler, described dephlegmator top is connected with heat transfer tube one end of described strong aqua condenser, described water cooler is connected with the cylindrical shell of described strong aqua condenser, the heat transfer tube the other end of described strong aqua condenser is connected with described ammoniacal liquor holder, at the bottom of described ammonia still tower, by described the 3rd lift pump, be connected with the heat transfer tube of described waste water preheater.
5. Rare Earths is smelted high ammonia-nitrogen wastewater resource utilization device as claimed in claim 4, it is characterized in that, described comprehensive treating process unit comprises: stripper plant, break are thrown chlorine reactor and waste water condenser, described stripper plant is connected with the cylindrical shell outlet of described waste water preheater, and described stripper plant, described break throwing rate reaction tower are connected successively with the heat transfer tube of described waste water condenser, and the cylindrical shell of described waste water condenser is connected with described water cooler.
6. Rare Earths is smelted high ammonia-nitrogen wastewater resource utilization device as claimed in claim 4, it is characterized in that, described water cooler is provided with the first import, the second import, the first outlet and the second outlet, described the first import is connected with the outlet of described dephlegmator, and described the first outlet is connected with the import of described dephlegmator;
Described the second outlet is connected with the cylindrical shell of described strong aqua, and described waste water condenser is connected with described the second import.
7. Rare Earths is smelted high ammonia-nitrogen wastewater resource utilization device as claimed in claim 1, it is characterized in that, described ammonia still adopts efficient slant-hole tray.
8. Rare Earths is smelted high ammonia-nitrogen wastewater resource utilization device as claimed in claim 4, it is characterized in that, described Rare Earths is smelted high ammonia-nitrogen wastewater resource utilization device and also comprised pickler, and described pickler is connected with described ammonia still.
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| CN104003564A (en) * | 2014-04-29 | 2014-08-27 | 佛山市新泰隆环保设备制造有限公司 | Wet-process rare earth smelting high ammonia-nitrogen wastewater resource utilization method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104003564A (en) * | 2014-04-29 | 2014-08-27 | 佛山市新泰隆环保设备制造有限公司 | Wet-process rare earth smelting high ammonia-nitrogen wastewater resource utilization method and device |
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