CN105152434A - Method and device for treating pickling waste water from stainless steel cold-rolling - Google Patents
Method and device for treating pickling waste water from stainless steel cold-rolling Download PDFInfo
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- CN105152434A CN105152434A CN201410224868.XA CN201410224868A CN105152434A CN 105152434 A CN105152434 A CN 105152434A CN 201410224868 A CN201410224868 A CN 201410224868A CN 105152434 A CN105152434 A CN 105152434A
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Abstract
The invention discloses a method for treating pickling waste water from stainless steel cold-rolling. The method comprises: performing ultrafiltration and reverse osmosis treatment of the pickling waste water from stainless steel cold-rolling; and performing multiple-effect evaporation of the waste water containing nitrate after ultrafiltration and reverse osmosis treatment to enable nitrate to be crystallized from the waste water. Accordingly, the invention also discloses a device for treating the pickling waste water from stainless steel cold-rolling, wherein the device comprises: an ultrafiltration device for performing ultrafiltration treatment of the pickling waste water from stainless steel cold-rolling; a reverse osmosis device connected to the ultrafiltration device and used for performing reverse osmosis treatment of the pickling waste water from stainless steel cold-rolling; a pre-heater, an input terminal of which is connected to an output terminal of the ultrafiltration device; a multi-effect evaporator component including a plurality of evaporators, a plurality of separators corresponding to the plurality of evaporators, and a steam inputting terminal, wherein the input terminal of the multi-effect evaporator component is connected to an output terminal of the pre-heater, the output terminal of the multi-effect evaporator component outputs a thick nitrate crystal liquid; and a centrifugal machine connected to the output terminal of the multi-effect evaporator component and used for separating nitrate crystal from the thick nitrate crystal liquid.
Description
Technical field
The present invention relates to a kind of method of wastewater treatment, particularly relate to a kind for the treatment of process of nitrogenous effluent.
Background technology
Stainless steel with the processing characteristics of its superior solidity to corrosion, unique Facing material and excellence, and is widely used in each manufacturing field, thus facilitates the fast development of stainless steel production.Pickling is as one critical process of cold rolled stainless steel band steel, it can not only clean the dirt such as greasy dirt, rust staining, weldering spot, zone of oxidation, free iron of belt steel surface, make stainless steel strip surface after treatment become even silvery white, but also directly can affect processing characteristics and the surface quality of cold rolled stainless steel band steel.Now, that most of enterprises of producing stainless steel adopts is chemical nitration mixture (HNO
3and HF) pickling and cold-rolling stainless steel strip, like this, will complex chemical composition be produced, the pickling waste waters that Pollutant levels are high in the terminal link of producing.
At present, the method for process nitration mixture waste water has a variety of, and existing technical process is: neutralization → flocculation → and except fluorine → precipitation → discharge.After this processing method process, the principal pollutant in waste water are total nitrogen.But, along with " Iron And Steel Industry pollution discharge standard " is in the promulgation on June 27th, 2012, the emission standard (total nitrogen need at below 15mg/L) of total nitrogen is defined first in this " standard ", this will ask manufacturing enterprise must reduce total nitrogen content in stainless steel cold-rolling pickling wastewater, thus realize qualified discharge.Therefore, it is desirable to obtain a kind of total nitrogen in cold-rolling pickling nitration mixture waste water can be controlled method below certain content and or device, the relevant criterion meeting country to make the cold-rolling pickling wastewater discharged after treatment and formulate.
Summary of the invention
The object of this invention is to provide a kind for the treatment of process of stainless steel cold-rolling pickling wastewater, it can remove the total nitrogen content in cold-rolling pickling wastewater effectively, reduce the total nitrogen in cold-rolling pickling wastewater significantly, to realize the qualified discharge of cold-rolling pickling wastewater, thus reach save energy, the object of environmental protection and economy.
In order to reach foregoing invention object, the invention provides the treatment process of stainless steel cold-rolling pickling wastewater, it comprises:
Ultrafiltration and reverse-osmosis treated are carried out to stainless steel cold-rolling pickling wastewater;
The nitrate wastewater that contains through ultrafiltration and reverse-osmosis treated is carried out multiple-effect evaporation, nitrate is crystallized out from waste water.
The operation steps such as treatment process optimum combination application ultrafiltration, reverse osmosis, multiple-effect evaporation, Crystallization Separation of stainless steel cold-rolling pickling wastewater of the present invention realizes the removal of total nitrogen in cold-rolling pickling wastewater.
In the treatment process of above-mentioned stainless steel cold-rolling pickling wastewater: first, waste water is through ultrafiltration and reverse-osmosis treated, uf processing mainly removes the impurity such as fine suspension, colloidal solid, larger molecular organics in waste water, reverse-osmosis treated mainly removes most salinities in the waste water after uf processing, colloid, bacterium, virus, the impurity such as bacterial endotoxin and most of organism, after ultrafiltration and reverse-osmosis treated, most of waste water can complete and purifies and be back to production; Then, waste water remainder being contained to nitrate carries out multiple-effect evaporation, and in Multi-effect Evaporation Processes, the water content of waste water reduces further, and the solute concentration of waste water improves constantly, thus promotes the precipitation of nitrate; Finally, nitrate crystallization, solid-liquid separation, the nitrogen in waste water is fixed in nitrate, thus the total nitrogen realizing waste water is removed, and then makes waste water reach the emission standard of regulation.
In addition, in Multi-effect Evaporation Processes, continuously to the solvent vapour that waste water heat supply produces to remove waste water.
Further, in actual production process, the multiple-effect evaporation in the treatment process of stainless steel cold-rolling pickling wastewater of the present invention is triple effect evaporation, to reduce the consumption of heating steam.
In addition, the treatment process of stainless steel cold-rolling pickling wastewater of the present invention also can adopt double-effect evaporation or four-effect evaporation.
Correspondingly, another object of the present invention is to the treatment unit that a kind of stainless steel cold-rolling pickling wastewater is provided, the total nitrogen that this treatment unit can realize in cold-rolling pickling wastewater is removed, and reduces the pollution level of cold-rolling pickling wastewater, realizes the qualified discharge of cold-rolling pickling wastewater.
In order to realize foregoing invention object, the treatment unit of a kind of stainless steel cold-rolling pickling wastewater of the present invention, it comprises:
Ultrafiltration apparatus, it carries out uf processing to stainless steel cold-rolling pickling wastewater;
Reverse osmosis equipment, it is connected with the outlet of ultrafiltration apparatus, to carry out reverse-osmosis treated to stainless steel cold-rolling pickling wastewater;
Preheater, its input terminus is connected with the output terminal of reverse osmosis equipment;
Multiple-effect evaporator assembly, it comprises several vaporizers and several separators corresponding with each vaporizer, and steam input port; Wherein the input terminus of multiple-effect evaporator assembly is connected with the output terminal of preheater, and its output terminal exports nitrate magma;
Whizzer, it is connected with the output terminal of multiple-effect evaporator assembly, to isolate nitrate crystal by nitrate magma.
In the treatment unit of above-mentioned stainless steel cold-rolling pickling wastewater, ultrafiltration apparatus is for removing the impurity such as fine suspension, colloidal solid, larger molecular organics in cold-rolling pickling wastewater, and reverse osmosis equipment is then for removing the impurity such as most of salinity, colloid, bacterium, virus, bacterial endotoxin and most of organism.
In above-mentioned multiple-effect evaporator assembly, several vaporizers couple together composition multi-effect evaporation system, and waste water is often taken as through a vaporizer and once effectively evaporates.And steam input port provides heating steam to one of them vaporizer in multiple-effect evaporator assembly, with water by waste water of continuous print heat energy, to reach the object of the water content reduced in waste water.The separator connected respectively with each vaporizer is then used for that the mixture that the vaporizer corresponding to it exports is carried out carbonated drink and is separated.Finally, what exported by multiple-effect evaporator assembly is the nitrate magma of separating out from waste water, then is separated from nitrate magma by nitrate crystal by whizzer.
Further, the first intermediate water tank is provided with between the ultrafiltration apparatus in the treatment unit of stainless steel cold-rolling pickling wastewater of the present invention and reverse osmosis equipment.
Further, the second intermediate water tank is provided with between the reverse osmosis equipment in the treatment unit of stainless steel cold-rolling pickling wastewater of the present invention and preheater.
Further, be provided with phlegma transport pipe between the multiple-effect evaporator assembly in the treatment unit of stainless steel cold-rolling pickling wastewater of the present invention and preheater, the phlegma that multiple-effect evaporator assembly produces in evaporative process provides thermal source for preheater.
Preheater can improve the temperature of waste water in advance, thus be conducive to the evaporation of waste water in multiple-effect evaporator assembly, and the thermal source of preheater comes from the waste heat of the phlegma that multiple-effect evaporator assembly produces in evaporative process, the thermal energy source that can reduce treatment unit so always consumes.
Further, in the treatment unit of stainless steel cold-rolling pickling wastewater of the present invention, above-mentioned multiple-effect evaporator assembly at least comprises:
1st effective evaporator, it connects steam input port, the input terminus of this 1st effective evaporator is connected by pipeline with the output terminal of preheater, the liquid material output terminal of 1st effective evaporator is connected to the input terminus of 1st effective evaporator by pipeline, the partially liq material of generation to be delivered to again the input terminus of 1st effective evaporator;
One effect separator, be connected by gas-liquid mixed transport pipe between its input terminus and the gas-liquid material output terminal of 1st effective evaporator, the liquid material output terminal of this effect separator is connected with the input terminus of 1st effective evaporator, the partially liq material of generation to be delivered to again the input terminus of 1st effective evaporator;
2nd effect evaporator, it is connected with a gas output end of imitating separator, and the liquid material output terminal that input terminus and the 1st effective evaporator and of this 2nd effect evaporator imitate separator is connected, to receive another part liquid material of 1st effective evaporator and an effect separator generation; The liquid material output terminal of 2nd effect evaporator is connected to the input terminus of 2nd effect evaporator by pipeline, the partially liq material of generation to be delivered to again the input terminus of 2nd effect evaporator;
Two effect separators, be connected by gas-liquid mixed transport pipe between its input terminus and the gas-liquid material output terminal of 2nd effect evaporator, the liquid material output terminal of this two effects separator is connected with the input terminus of 2nd effect evaporator, the partially liq material of generation to be delivered to again the input terminus of 2nd effect evaporator;
Triple-effect evaporator, it is connected with two gas output ends of imitating separator, and the liquid material output terminal that input terminus and the 2nd effect evaporator and two of this triple-effect evaporator imitate separator is connected, to receive another part liquid material of 2nd effect evaporator and two effect separators generations; The liquid material output terminal of triple-effect evaporator is connected to the input terminus of triple-effect evaporator by pipeline, the liquid material of generation to be delivered to again the input terminus of triple-effect evaporator;
Triple effect separator, be connected by gas-liquid mixed transport pipe between its input terminus and the gas-liquid material output terminal of triple-effect evaporator, this triple effect separator has superposed mother liquor output terminal and is positioned at the magma output terminal of bottom, wherein mother liquor output terminal is connected with the input terminus of triple-effect evaporator, the mother liquor after isolating nitrate magma to be delivered to again the input terminus of triple-effect evaporator; Magma output terminal is connected to whizzer, and gas is discharged by the gas output end of this triple effect separator.
In multiple-effect evaporator assembly, each vaporizer correspondence arranges a separator, and waste water often through a vaporizer, once effectively evaporates exactly, and three groups of vaporizers and separator can realize triple effect evaporation.
For 1st effective evaporator and an effect separator, the effluent part being heated vaporized in 1st effective evaporator (partially liq material) is delivered in 1st effective evaporator by the liquid material output terminal of 1st effective evaporator again, continues in 1st effective evaporator by thermal evaporation; The mixture of gas and liquid is then delivered to an effect separator by the gas-liquid material output terminal of 1st effective evaporator; After an effect separator carries out gas-liquid separation for the mixture of this gas and liquid, effluent part (partially liq material) after separation is delivered in 1st effective evaporator by the liquid material output terminal of one effect separator again, secondary steam after separation is delivered in next vaporizer (2nd effect evaporator) by the gas output end of one effect separator, this secondary steam can as the heating steam of 2nd effect evaporator, and without the need to introducing heating steam from the external world again.In addition, another part waste water is also delivered in 2nd effect evaporator to carry out heating evaporation next time by liquid material output terminal by 1st effective evaporator and an effect separator.
At this, 1st effective evaporator and an effect separator are called an effect stage.In an effect stage, partially liq material can be delivered in 1st effective evaporator by the liquid material output terminal of 1st effective evaporator and an effect separator again, thus achieves the partially liq circulation in an effect stage.
Above-mentioned 1st effective evaporator and an effect separator principle of work can the rest may be inferred to 2nd effect evaporator and two effects separators (and triple-effect evaporator and triple effect separator), just repeated no more at this.
It should be noted that, as the vaporizer of first in multiple-effect evaporator assembly, the heating steam of 1st effective evaporator comes from the extraneous steam introduced from steam input port instead of secondary steam.As last separator in multiple-effect evaporator assembly, triple effect separator has three output terminals, wherein the magma being mixed with crystal grain is delivered to whizzer by magma output terminal, remaining mother liquor is then delivered in triple-effect evaporator again by mother liquor output terminal, and gas then directly gives off outside multiple-effect evaporator assembly by the gas output end of triple effect separator.
In addition, compare to extraneous steam, from a upper vaporizer produce and heating steam for next vaporizer is referred to as secondary steam.
Owing to nitrate Crystallization Separation from waste water out often to be needed evaporate a large amount of moisture, therefore need to consume a large amount of heating steam.Above-mentioned multiple-effect evaporator assembly is utilized to realize triple effect evaporation, in triple effect evaporation, can the secondary steam that a upper vaporizer produces be incorporated in next vaporizer as heating steam, such heating steam obtains recycle, take full advantage of the heat source for the treatment of unit inside, thus significantly reduce consumption of heat energy, and then reduce production cost.
Apparently, above-mentioned multiple-effect evaporator assembly also can reduce a vaporizer and separator, to realize the double-effect evaporation of waste water; Or increase a vaporizer and separator, to realize the four-effect evaporation of waste water.
Further, the treatment unit of stainless steel cold-rolling pickling wastewater of the present invention also comprises concentrated solution receiving tank, it is connected respectively with the output terminal of whizzer and the input terminus of triple effect separator, the concentrated solution that whizzer is discharged after isolating nitrate crystal enters concentrated solution receiving tank, is again sent into triple effect separator from concentrated solution receiving tank.
Further, the treatment unit of stainless steel cold-rolling pickling wastewater of the present invention also comprises condenser, and it is connected with the gas discharge end of multiple-effect evaporator assembly, and this condenser is provided with cooling water inlet, condenser cools input gas wherein, discharges water of condensation.
Further, the treatment unit of stainless steel cold-rolling pickling wastewater of the present invention also comprises condensate collector, and it is connected by phlegma transport pipe with multiple-effect evaporator assembly, and this condensate collector is also connected with condenser.
Water of condensation in condenser collector is transferred and is applied to productive life after reclaiming.
The treatment process of stainless steel cold-rolling pickling wastewater of the present invention and device can remove the total nitrogen in cold-rolling pickling wastewater effectively by the crystallization of nitrate, to realize the qualified discharge of cold-rolling pickling wastewater, thus reach save energy, the object of environmental protection and economy.
In addition, the treatment process of stainless steel cold-rolling pickling wastewater of the present invention and device recycle heating energy source can realize the removal of total nitrogen in cold-rolling pickling wastewater, improve the utilization ratio of steam, decrease the consumption of heat energy.
Accompanying drawing explanation
Fig. 1 is the structural representation for the treatment of unit under a kind of embodiment of stainless steel cold-rolling pickling wastewater of the present invention.
Fig. 2 amplification shows as the members in the treatment unit of the stainless steel cold-rolling pickling wastewater shown in Fig. 1.
Embodiment
By according to specific embodiment and Figure of description, the treatment process of stainless steel cold-rolling pickling wastewater of the present invention and device are described further below, but this explanation does not form the improper restriction to technical solution of the present invention.
Fig. 1 shows the structure for the treatment of unit under a kind of embodiment of stainless steel cold-rolling pickling wastewater of the present invention.Fig. 2 enlargedly show the structure of preheater, multiple-effect evaporator assembly, whizzer, concentrated solution receiving tank, condenser, cooling tower and condensate collector in the treatment unit of the stainless steel cold-rolling pickling wastewater shown in Fig. 1.
In fig. 1 and 2, AR represents gas transfer pipeline, and CW represents nitrate magma transfer line, and DN represents gas-liquid mass transport pipeline, and DW express liquid mass transport pipeline, DX represents water coolant transfer line, and DY represents phlegma transfer line.The direction of arrow in each pipeline of Fig. 1 and Fig. 2 represents gas material, liquid material or the flow direction of gas-liquid mixed material in this pipeline.
As depicted in figs. 1 and 2, the treatment unit 10 of the stainless steel cold-rolling pickling wastewater of the present embodiment comprises intermediate pool A, and it is accepted needs stainless steel cold-rolling pickling wastewater to be processed; Ultrafiltration apparatus 1, it is connected with the outlet of intermediate pool A, to carry out uf processing to stainless steel cold-rolling pickling wastewater; Reverse osmosis equipment 2, it is connected with the outlet of ultrafiltration apparatus 1, to carry out reverse-osmosis treated to stainless steel cold-rolling pickling wastewater, the connecting pipeline between ultrafiltration apparatus 1 and reverse osmosis equipment 2 is provided with the first intermediate water tank B; Preheater 3, its input terminus 31 is connected with the output terminal of reverse osmosis equipment, the connecting pipeline between reverse osmosis equipment 2 and preheater 3 is provided with the second intermediate water tank C; The input terminus 411 of multiple-effect evaporator assembly 4 is connected with the output terminal 32 of preheater 3, and the output terminal 462 of multiple-effect evaporator assembly 4 exports nitrate magma; Whizzer 5, it is connected with the output terminal 462 of multiple-effect evaporator assembly, isolates nitrate crystal from nitrate magma; Condenser 6, it is connected with the gas discharge end 463 of multiple-effect evaporator assembly, to receive the exhaust vapour from multiple-effect evaporator assembly, condenser 6 is provided with cooling water inlet 61, to introduce water coolant from cooling tower 7, the gas in condenser is cooled, and discharge water of condensation from condensed fluid output terminal 62; Condensate collector 8, it is connected by phlegma transport pipe DY1 with multiple-effect evaporator assembly 4, and this condensate collector 8 and condenser 6 are also connected by phlegma transport pipe DY2 simultaneously.In addition, phlegma transport pipe DY3 is provided with between multiple-effect evaporator assembly 4 and preheater 3, using the phlegma that multiple-effect evaporator assembly is produced in evaporative process as the heating energy source of preheater, be provided with phlegma transport pipe DY4 between condensate collector 8 and preheater 3, be recycled in condensate collector 8 with the phlegma that preheater is produced in warm.
As shown in Figure 2, the multiple-effect evaporator assembly in the treatment unit of the stainless steel cold-rolling pickling wastewater of the present embodiment comprises: 1st effective evaporator 41, an effect separator 42,2nd effect evaporator 43, two effect separator 44, triple-effect evaporator 45 and triple effect separators 46.1st effective evaporator 41 connects steam input port P, the input terminus 411 of 1st effective evaporator 41 is connected by pipeline with the output terminal 32 of preheater 3, the liquid material output terminal 412 of 1st effective evaporator 41 is connected to the input terminus 411 of 1st effective evaporator by liquid material transfer line DW, be again delivered in 1st effective evaporator 41 thus by the partially liq material of generation; Be connected by gas-liquid mixed transport pipe DN between the input terminus 421 of one effect separator 42 and the gas-liquid material output terminal 413 of 1st effective evaporator 41, the one effect liquid material output terminal 422 of separator 42 is connected with the input terminus 411 of 1st effective evaporator, is again delivered in 1st effective evaporator 41 by the partially liq material of generation thus.The gas output end 423 that 2nd effect evaporator 43 and imitates separator 42 is connected, the input terminus 431 of 2nd effect evaporator 43 is connected with the liquid material output terminal 412 of 1st effective evaporator 41 and a liquid material output terminal 422 of imitating separator, is used for receiving another part liquid material that 1st effective evaporator 41 and an effect separator 42 produce; The liquid material output terminal 432 of 2nd effect evaporator 43 is connected to the input terminus 431 of 2nd effect evaporator 43 by liquid material transfer line DW, be again delivered in 2nd effect evaporator 43 thus by the partially liq material of generation; Be connected by gas-liquid mixed transport pipe DN between the input terminus 441 of two effect separators 44 and the gas-liquid material output terminal 433 of 2nd effect evaporator 43, the two effect liquid material output terminals 442 of separator 44 are connected with the input terminus 431 of 2nd effect evaporator 43, are again delivered in 2nd effect evaporator 43 by the partially liq material of generation thus.The gas output end 443 that triple-effect evaporator 45 and two imitates separator is connected, the input terminus 451 of triple-effect evaporator 45 is connected with the liquid material output terminal 432 of 2nd effect evaporator 43 and the two liquid material output terminals 442 of imitating separator 44, is used for receiving another part liquid material that 2nd effect evaporator 43 and two effect separators 44 produce; The liquid material output terminal 452 of triple-effect evaporator 45 is connected to the input terminus 451 of triple-effect evaporator by liquid material transfer line DW, be again delivered in triple-effect evaporator 45 thus by the liquid material of generation; Be connected by gas-liquid mixed transport pipe DN between the input terminus 461 of triple effect separator 46 and the gas-liquid material output terminal 453 of triple-effect evaporator 45, mother liquor output terminal 464 is provided with on the top of triple effect separator 46, magma output terminal 462 is provided with bottom it, wherein, magma output terminal 462 is connected to whizzer 5, mother liquor output terminal 464 is connected with the input terminus 451 of triple-effect evaporator 45, and after being separated by magma thus, remaining mother liquor is delivered in triple-effect evaporator 45 again; And the gas output end 463 of triple effect separator 46 is connected with condenser 6, gas is discharged from multiple-effect evaporator assembly.
In addition, concentrated solution receiving tank 9 is connected respectively with the output terminal 52 of whizzer and the input terminus 465 of triple effect separator 46, the concentrated solution that the nitrate crystal of precipitation carries out being separated rear discharge is entered concentrated solution receiving tank 9 by whizzer 5, and this concentrated solution is sent into triple effect separator 46 again from concentrated solution receiving tank 9.
Carbonated drink separation is carried out in the effect of each separator in above-mentioned multiple-effect evaporator assembly, is introduced in next vaporizer by the secondary steam after being separated, thus achieves effective utilization of heating steam as thermal source.
It should be noted that, after liquid constantly evaporated, its viscosity can become large and easily in pipeline, produce crystallization, aforesaid liquid mass transport pipeline DW can correspondingly arrange transferpump Q, can improve the mobility of liquid.
See the content shown in Fig. 1 and Fig. 2, in actual use, the treatment process of stainless steel cold-rolling pickling wastewater of the present invention, the steps include:
1) uf processing is carried out to stainless steel cold-rolling pickling wastewater;
2) reverse-osmosis treated is carried out to stainless steel cold-rolling pickling wastewater;
3) nitrate wastewater that contains through ultrafiltration and reverse-osmosis treated is heated in advance;
4) triple effect evaporation is carried out to pre-thermal wastewater, make it become the nitrate magma of precipitation;
5) nitrate crystal is separated from nitrate magma;
6) process water that water of condensation is produced as postorder is collected.
It should be noted that above enumerate be only specific embodiments of the invention, obviously the invention is not restricted to above embodiment, have many similar changes thereupon.If all distortion that those skilled in the art directly derives from content disclosed by the invention or associates, protection scope of the present invention all should be belonged to.
Claims (10)
1. a treatment process for stainless steel cold-rolling pickling wastewater, is characterized in that, comprising:
Ultrafiltration and reverse-osmosis treated are carried out to stainless steel cold-rolling pickling wastewater;
The nitrate wastewater that contains through ultrafiltration and reverse-osmosis treated is carried out multiple-effect evaporation, nitrate is crystallized out from waste water.
2. the treatment process of stainless steel cold-rolling pickling wastewater as claimed in claim 1, is characterized in that: described multiple-effect evaporation is triple effect evaporation.
3. a treatment unit for stainless steel cold-rolling pickling wastewater, is characterized in that, comprising:
Ultrafiltration apparatus, it carries out uf processing to stainless steel cold-rolling pickling wastewater;
Reverse osmosis equipment, it is connected with the outlet of described ultrafiltration apparatus, to carry out reverse-osmosis treated to stainless steel cold-rolling pickling wastewater;
Preheater, its input terminus is connected with the output terminal of reverse osmosis equipment;
Multiple-effect evaporator assembly, it comprises several vaporizers and several separators corresponding with each vaporizer, and steam input port; Wherein the input terminus of multiple-effect evaporator assembly is connected with the output terminal of described preheater, and its output terminal exports nitrate magma;
Whizzer, it is connected with the output terminal of multiple-effect evaporator assembly, to isolate nitrate crystal by nitrate magma.
4. the treatment unit of stainless steel cold-rolling pickling wastewater as claimed in claim 3, is characterized in that: be provided with the first intermediate water tank between described ultrafiltration apparatus and reverse osmosis equipment.
5. the treatment unit of stainless steel cold-rolling pickling wastewater as claimed in claim 3, is characterized in that: be provided with the second intermediate water tank between described reverse osmosis equipment and preheater.
6. the treatment unit of stainless steel cold-rolling pickling wastewater as claimed in claim 3, it is characterized in that: be provided with phlegma transport pipe between described multiple-effect evaporator assembly and preheater, the phlegma that multiple-effect evaporator assembly produces in evaporative process provides thermal source for preheater.
7. the treatment unit of stainless steel cold-rolling pickling wastewater as claimed in claim 3, is characterized in that: described multiple-effect evaporator assembly at least comprises:
1st effective evaporator, it connects described steam input port, the input terminus of described 1st effective evaporator is connected by pipeline with the output terminal of preheater, the liquid material output terminal of 1st effective evaporator is connected to the input terminus of 1st effective evaporator by pipeline, the partially liq material of generation to be delivered to again the input terminus of 1st effective evaporator;
One effect separator, be connected by gas-liquid mixed transport pipe between its input terminus and the gas-liquid material output terminal of described 1st effective evaporator, the liquid material output terminal of a described effect separator is connected with the input terminus of 1st effective evaporator, the partially liq material of generation to be delivered to again the input terminus of 1st effective evaporator;
2nd effect evaporator, it is connected with a gas output end of imitating separator, the liquid material output terminal that input terminus and the 1st effective evaporator and one of described 2nd effect evaporator imitate separator is connected, to receive another part liquid material of 1st effective evaporator and an effect separator generation; The liquid material output terminal of 2nd effect evaporator is connected to the input terminus of 2nd effect evaporator by pipeline, the partially liq material of generation to be delivered to again the input terminus of 2nd effect evaporator;
Two effect separators, be connected by gas-liquid mixed transport pipe between its input terminus and the gas-liquid material output terminal of described 2nd effect evaporator, the liquid material output terminal of described two effect separators is connected with the input terminus of 2nd effect evaporator, the partially liq material of generation to be delivered to again the input terminus of 2nd effect evaporator;
Triple-effect evaporator, it is connected with two gas output ends of imitating separator, the liquid material output terminal that input terminus and the 2nd effect evaporator and two of described triple-effect evaporator imitate separator is connected, to receive another part liquid material of 2nd effect evaporator and two effect separators generations; The liquid material output terminal of triple-effect evaporator is connected to the input terminus of triple-effect evaporator by pipeline, the liquid material of generation to be delivered to again the input terminus of triple-effect evaporator;
Triple effect separator, be connected by gas-liquid mixed transport pipe between its input terminus and the gas-liquid material output terminal of described triple-effect evaporator, described triple effect separator has superposed mother liquor output terminal and is positioned at the magma output terminal of bottom, and wherein mother liquor output terminal is connected with the input terminus of triple-effect evaporator; Described magma output terminal is connected to described whizzer, and gas is discharged by the gas output end of described triple effect separator.
8. the treatment unit of stainless steel cold-rolling pickling wastewater as claimed in claim 7, it is characterized in that, also comprise concentrated solution receiving tank, it is connected respectively with the output terminal of described whizzer and the input terminus of triple effect separator, the concentrated solution that described whizzer is discharged after isolating nitrate crystal enters concentrated solution receiving tank, is again sent into triple effect separator from concentrated solution receiving tank.
9. the treatment unit of stainless steel cold-rolling pickling wastewater as claimed in claim 3, it is characterized in that, also comprise condenser, it is connected with the gas discharge end of described multiple-effect evaporator assembly, described condenser is provided with cooling water inlet, described condenser cools input gas wherein, discharges water of condensation.
10. the treatment unit of stainless steel cold-rolling pickling wastewater as claimed in claim 9, it is characterized in that, also comprise condensate collector, it is connected by phlegma transport pipe with described multiple-effect evaporator assembly, and described condensate collector is also connected with described condenser.
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