CN105442032A - Copper-containing nitric acid stripping hanging liquid regeneration treatment method - Google Patents
Copper-containing nitric acid stripping hanging liquid regeneration treatment method Download PDFInfo
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Abstract
The invention provides a copper-containing nitric acid stripping hanging liquid regeneration treatment method including the steps: carrying out reduced pressure distillation treatment of a copper-containing nitric acid stripping hanging liquid to obtain a distilled liquid and a concentrated liquid; adding sulfuric acid to the concentrated liquid, carrying out a reaction to obtain a copper sulfate pentahydrate precipitate and a nitric acid solution; and mixing the distilled liquid and the nitric acid solution to obtain a regenerated liquid. The copper-containing nitric acid stripping hanging liquid regeneration treatment method of the embodiment not only can make copper ions in the copper-containing nitric acid stripping hanging liquid precipitated, but also cannot destroy components; after the concentration is finely adjusted, the copper-containing nitric acid stripping hanging liquid can return to a production line and continues to be used, and thus a hanging tool deplating process becomes a clean production process with no pollution and zero discharge of waste liquid.
Description
Technical field
The invention belongs to cupric nitric acid stripping and hanging liquid process field, be specifically related to a kind of cupric nitric acid stripping and hanging liquid regeneration treating method.
Background technology
Printed board is one of base electronic component products, has become the requisite electronic devices and components series products of electronics.Along with Electronic Development of Information Industry, printed electronic circuit industry also development thereupon.China's Mainland PCB (PrintedCircuitBoard, printed circuit board) output occupies the first in the world, accounts for Gross World Product 26%.According to the statistic data of 2006, the China's Mainland printed circuit board gross output value about had 1,000 hundred million yuan.China PCB output value reaches average out to 26.27% from 2003 to the annual growth 2006 4 years, and a few years from now on still has the rate of increase development of average annual about 15%.
PCB industry is simultaneously the same with paper industry, textile industry, decorative plating etc., and being use water rich and influential family, is again contaminate environment rich and influential family.The increase of PCB output, had both meaned the increase of water consumption, meaned again the increase of environmental pollution amount simultaneously.According to environmental regulation requirement, all should there be the disposal of three wastes in PCB factory, but emphasis now is end treatment.Because Environmental Inputs during some factory constructions is not enough or the later stage is run abnormal, fails to accomplish qualified discharge, cause Heavy environmental pollution.Electroplating technology is also production stage important in PCB industry, electroplating technology is along with the carrying out of electroplating technology flow process, hanger as plating piece supporter is also coated with corresponding various metal plating, because suspension member wants Reusability, having plated when a collection of plating piece carries out next batch plating piece and thoroughly must strip the coating on hanger, otherwise pollute plating solution.Hanger generally adopts stainless steel, and the decoating liquid nitric acid that PCB coppered wire adopts, the waste water of generation is listed in Hazardous wastes and belongs to HW22 class, and its cupric ion is high, and acidity is large, has a strong impact on environment.
Current way is last auspicious improvement, take dispersion transport, acid-base neutralisation is adopted after concentrating, the art breading of Preparation of Cupric Sulfate, in transportation engineering, there is the risk of pollutions such as run, drip, leak, copper is only recycled by the technique of its Preparation of Cupric Sulfate, and discharges after only adopting neutralizing treatment to elements such as nitric acid, both cause the wasting of resources, produce again serious secondary pollution.Current country emphasizes energy-saving and emission-reduction, recycling economy; walk the road of Sustainable development; environment protection oneself be each Chinese responsibility; nitric acid stripping and hanging waste liquid how is made to eliminate in process of production; thoroughly effect a radical cure from source and its resource recycling is regenerated and use; realize cleaner production, recycle, become the R&D target of scientific and technical personnel.
Summary of the invention
The object of the embodiment of the present invention is the above-mentioned deficiency overcoming prior art, provides a kind of cupric nitric acid stripping and hanging liquid regeneration treating method, and the cyclic regeneration that can realize cupric nitric acid stripping and hanging liquid uses.
In order to realize foregoing invention object, the technical scheme of the embodiment of the present invention is as follows:
A kind of cupric nitric acid stripping and hanging liquid regeneration treating method, comprising: cupric nitric acid stripping and hanging liquid underpressure distillation process is obtained distillate and concentrated solution; Sulfuric acid is joined in described concentrated solution and be obtained by reacting cupric sulfate pentahydrate precipitation and salpeter solution; Described distillate and described salpeter solution are mixed to get regenerated liquid.
Cupric nitric acid stripping and hanging liquid regeneration treating method in above-described embodiment, cupric ion in cupric nitric acid stripping and hanging liquid can be settled, its component can not be destroyed again, after finely tuning its concentration, production line can be returned continue to use, make that hanger strip operation becomes pollution-free, the cleaner production operation of Zero discharge.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the schema of the cupric nitric acid stripping and hanging liquid regeneration treating method of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, be the schema of the cupric nitric acid stripping and hanging liquid regeneration treating method of the embodiment of the present invention.The step of cupric nitric acid stripping and hanging liquid regeneration treating method of the present invention is as follows:
Step S01: cupric nitric acid stripping and hanging liquid underpressure distillation process is obtained distillate and concentrated solution.
Before underpressure distillation, collect enough cupric nitric acid stripping and hanging liquid so that the circulation of whole technique is carried out.
Underpressure distillation, also known as vacuum-evaporation, being the object for reaching concentrated medicine or removing volatility solvent, forming certain vacuum tightness in vaporizer, by the boiling point lowering of solution, carries out the explosive evaporatoin treatment process of evaporation operation at sub-atmospheric pressure.Discharged after condenser by secondary steam, the secondary steam at this moment in vaporizer can form negative pressure.During operation, equipment is airtight, and production efficiency is high, and operational condition is good.
In vacuum distillation process, due to solution boiling point lowering, can prevent or reduce the decomposition of heat-sensitive materials, also can increase heat transfer temperature difference, enhanced water evaporation operates, and, also reduces the requirement of heat source meanwhile.Current decompression distillation is widely used in medicament is produced, and underpressure distillation is applied to the process of cupric nitric acid stripping and hanging liquid by the technical program.The equipment of underpressure distillation is conventional single-action or multiple-effect reduced vacuum equipment, such as underpressure distillation device, and the material that its material main body contacts with solution can be titanium, and what other contacted with distillate can be 316L stainless steel or titanium.Should be understood that, the application, not as limit, also can adopt the distillation plant of other materials.
The type of heating of underpressure distillation is heating power oil, electricity, steam etc., and it can make thermal source conduct heat to by heated solution by heat pipe contact.Should be understood that, the application, not as limit, also can adopt other type of heating.
The principle of underpressure distillation is the separation realizing liquid according to the temperature difference of liquid boiling under different vacuum tightness.Such as, the solubleness of cupric nitrate under the condition of 30 DEG C is dissolve 156g cupric nitrate in every 100g water, and being converted into content of copper ion can reach 408g/L.Object due to underpressure distillation is the moisture in cupric nitric acid stripping and hanging liquid (nitric acid-copper nitrate solution) to evaporate away, be distilled out of as little as possible for making nitric acid, by the process parameter control of underpressure distillation be: the temperature of underpressure distillation is 55 ~ 65 DEG C, the pressure of underpressure distillation is-0.09 ~ 0.07MPa.Will control vacuum tightness in vacuum distillation process, i.e. the pressure of underpressure distillation, the pressure of underpressure distillation is different, and the temperature of underpressure distillation can change.If the pressure of underpressure distillation is not within the scope of-0.09 ~ 0.07MPa, in the solution be steamed out, concentration of nitric acid is higher, also needs to reduce the concentration of nitric acid if carry out follow-up operation; In addition, underpressure distillation pressure raises, and the temperature of underpressure distillation also can raise, and energy consumption is raised, and wastes energy and not environmentally.
Respectively distillate and concentrated solution are collected after distillation, concentration of nitric acid (HNO in distillate
3amount of substance and the volume ratio of solution) be below 1.5mol/L, in concentrated solution, the concentration of cupric ion is more than 100g/L, concentration of nitric acid (HNO in concentrated solution
3amount of substance and the volume ratio of solution) be 6 ~ 8mol/L.If concentration of nitric acid is low in distillate, what can concentrate is more some more, but particular case will be determined according to cupric ion in solution and concentration of nitric acid.
Step S02: sulfuric acid is joined in concentrated solution and be obtained by reacting cupric sulfate pentahydrate precipitation and salpeter solution.
In order to reduce heat release, causing nitric acid to decompose and producing NO, using H
2sO
4massfraction is that the sulfuric acid of 80 ~ 98wt.% adds in concentrated solution, needs the mixing solutions cooling sulfuric acid and concentrated solution if desired, such as, can cool with cooling tube.After mixing, left standstill by mixing solutions, sulfuric acid and cupric ion fully react, and obtain cupric sulfate pentahydrate.If cooled by reacted mixing solutions, reduce with temperature, the solubleness of cupric sulfate pentahydrate reduces, and the cupric sulfate pentahydrate precipitation obtained can be more.Then separating and filtering, obtains cupric sulfate pentahydrate for subsequent use.The solubleness of copper sulfate under the condition of 30 DEG C is dissolve 25g copper sulfate in every 100g water, and being converted into content of copper ion can reach 61g/L.Due to temperature and solution composition, solubleness in the solution of cupric sulfate pentahydrate after concentrated solution and strong sulfuric acid response is lower than the solubleness in water, copper sulfate two kinds of systems in solubleness differ greatly, thus can crystallize out.A large amount of cupric ions is precipitated out from this solution, and therefore staying cupric ion residual in salpeter solution can reduce.
The reaction principle generating copper sulfate is: Cu (NO
3)
2+ H
2sO
4=CuSO
4+ 2HNO
3, cupric sulphate crystal is cupric sulfate pentahydrate.This reaction can be carried out at normal temperatures.
Step S03: distillate and salpeter solution are mixed to get regenerated liquid.
Due to underpressure distillation and the concentration of nitric acid of the salpeter solution obtained after adding sulfuric acid all can rise, usual concentration of nitric acid (HNO
3amount of substance and the volume ratio of solution) can more than 14mol/L be reached.Will get back to electroplating assembly line as this salpeter solution to use, need adjust concentration of nitric acid is 6 ~ 10mol/L.Due to the composition mainly water of distillate, therefore, using the solvent of distillate as adjustment concentration of nitric acid, itself and salpeter solution are mixed to get regenerated liquid, make the concentration of nitric acid in regenerated liquid be 6 ~ 10mol/L.The application is not limited with this concentration of nitric acid, and concentration of nitric acid can be determined depending on producer's processing requirement, and therefore the add-on of distillate can be selected to add according to this particular case.Copper ion concentration in this regenerated liquid is 6 ~ 18g/L.
The regenerated liquid prepared as decoating liquid for the production of printed circuit board coppered wire.
The copper sulfate that step S02 obtains can be sold as copper sulfate reagent or use, and also electrolysis can obtain copper further, specific as follows:
Step S04: cupric sulfate pentahydrate electrolysis is obtained oxygen, copper and sulfuric acid.
After the copper sulphate dissolves that step S02 is obtained, under the effect of electric current, fine and close copper coin can be obtained by this copper-bath of electrolysis, and produce oxygen and sulfuric acid.Electrolysis process operational condition is as shown in table 1.Should be understood that, this electrolysis process operational condition is not limited with table 1, also can select according to practical situation.
Table 1 electrolysis process operational condition
The electrode reaction of this electrolytic process is as follows:
Anodic reaction: 4OH
-=O
2+ 2H
2o+4e
Cathodic reaction: Cu
2++ 2e=Cu
The sulfuric acid obtained in step S04 can join recycle in concentrated solution, specific as follows:
Step S05: join after the sulphuric acid concentration that electrolysis is obtained in concentrated solution and be obtained by reacting cupric sulfate pentahydrate precipitation and salpeter solution.
This step can realize recycling of sulfuric acid, economizes on resources.
Easily decompose because nitric acid is unstable, and during copper sulfate bath, in the oxygen that anode produces, part of sulfuric acid mist may be carried, atmospheric pollution can be caused if it be directly discharged in air, therefore need to be discharged into after oxygen treatments applied again in air.Specific as follows:
Step S06: by sulfuric acid mist and sodium hydroxide solution neutralization.
Oxygen can by discharging after alkaline foam removing acid mist.This process can be carried out in spray column.Spray column spray sodium hydroxide solution, sulfuric acid mist and sodium hydroxide solution neutralize, and make the gas conformance with standard of discharge.The sodium hydroxide solution of these remnants can reflux and continue spray.The pH value of the sodium hydroxide solution in spray column controls 8 ~ 13, when in sulfuric acid mist and sodium hydroxide and time, the pH value of the sodium hydroxide solution of spray constantly reduces, and when pH value is down to 8, can be recycled with after sheet alkali adjust ph to 13.After the process of alkaline solution spray, the SO of emission gases
2content is reduced to 130 ~ 180mg/m
3, be less than GB16297-1996 effluent standard limit value 500mg/m
3, drainage rate is 1.1 ~ 1.6kg/h, is less than the GB16297-1996 effluent standard limit value of 2.1kg/h.
Cupric nitric acid stripping and hanging liquid regeneration treating method is illustrated below by way of multiple embodiment.
Embodiment 1
Certain wiring board produces stripping and hanging section, and opening cylinder concentration of nitric acid is 9mol/L, and under the situation of continuous strip, copper ion concentration raises, and the concentration of nitric acid also declines thereupon, stops using when concentration of nitric acid reduces to 4 ~ 5mol/L time, and at this moment its copper ion concentration is about 50g/L.
Through waste collection, it is 55 DEG C in the temperature of underpressure distillation, under the condition of vacuum tightness-0.09MPa, cupric nitric acid stripping and hanging liquid is carried out underpressure distillation and obtains distillate and concentrated solution, the volume of concentrated solution is made to be the half of the volume of former cupric nitric acid stripping and hanging liquid, in the distillate obtained after concentrated, concentration of nitric acid is 1.2mol/L after measured, and in concentrated solution, concentration of nitric acid is 7mol/L, and copper ion concentration is 103g/L.Then in concentrated solution, H is added
2sO
4massfraction is the sulfuric acid of 80%, produces a large amount of cupric sulfate pentahydrate crystallizations after being placed into room temperature, itself and liquid separation is obtained supernatant liquor and copper sulfate precipitates.Supernatant liquor after this separation is salpeter solution, and in this solution, concentration of nitric acid is 14mol/L, and copper ion concentration is 33g/L, is become by this solution concentration of nitric acid to be the regenerated liquid of 9mol/L with distillate Mixed adjustment.Cupric ion in this regenerated liquid only has 15g/L, meets the requirement as the reuse of cupric nitric acid stripping and hanging liquid completely.
The copper sulfate obtained precipitation (cupric sulfate pentahydrate) is obtained oxygen, copper and sulfuric acid according to the operational condition electrolysis of table 1.Turn back to after the sulphuric acid concentration that electrolysis is obtained in concentrated solution and be used for being obtained by reacting cupric sulfate pentahydrate precipitation and salpeter solution, realize the recycling of resource.By produce with sulfuric acid mist oxygen by spray column by pH value be 8 ~ 13 sodium hydroxide neutralizing treatment after be discharged in air, avoid contaminate environment.
Embodiment 2
Certain wiring board produces stripping and hanging section, and opening cylinder concentration of nitric acid is 6mol/L, and under the situation of continuous strip, copper ion concentration raises, and the concentration of nitric acid also declines thereupon, stops using when concentration of nitric acid reduces to 3mol/L time, and at this moment its copper ion concentration is about 40g/L.
Through waste collection, it is 60 DEG C in the temperature of underpressure distillation, under the condition of vacuum tightness-0.08MPa, cupric nitric acid stripping and hanging liquid is carried out underpressure distillation and obtains distillate and concentrated solution, the volume of concentrated solution is made to be the half of the volume of former cupric nitric acid stripping and hanging liquid, in the distillate obtained after concentrated, concentration of nitric acid is 0.6mol/L after measured, and in concentrated solution, concentration of nitric acid is 6mol/L, and copper ion concentration is 110g/L.Then in concentrated solution, H is added
2sO
4massfraction is the sulfuric acid of 80%, produces a large amount of cupric sulfate pentahydrate crystallizations after being placed into room temperature, itself and liquid separation is obtained supernatant liquor and copper sulfate precipitates.Supernatant liquor after this separation is salpeter solution, in this solution, concentration of nitric acid is 13mol/L, copper ion concentration is 32g/L, become by this solution concentration of nitric acid to be the regenerated liquid of 6mol/L with distillate Mixed adjustment, cupric ion in this regenerated liquid only has 10g/L, meets the requirement as the reuse of cupric nitric acid stripping and hanging liquid completely.
The copper sulfate obtained precipitation (cupric sulfate pentahydrate) is obtained oxygen, copper and sulfuric acid according to the operational condition electrolysis of table 1.Turn back to after the sulphuric acid concentration that electrolysis is obtained in concentrated solution and be used for being obtained by reacting cupric sulfate pentahydrate precipitation and salpeter solution, realize the recycling of resource.By produce with sulfuric acid mist oxygen by spray column by pH value be 8 ~ 13 sodium hydroxide neutralizing treatment after be discharged in air, avoid contaminate environment.
Embodiment 3
Certain wiring board produces stripping and hanging section, and opening cylinder concentration of nitric acid is 11mol/L, and under the situation of continuous strip, copper ion concentration raises, and the concentration of nitric acid also declines thereupon, stops using when concentration of nitric acid reduces to 3mol/L time, and at this moment its copper ion concentration is about 73g/L.
Through waste collection, it is 65 DEG C in the temperature of underpressure distillation, under the condition of vacuum tightness-0.08MPa, cupric nitric acid stripping and hanging liquid is carried out underpressure distillation and obtains distillate and concentrated solution, the volume of concentrated solution is made to be the half of the volume of former cupric nitric acid stripping and hanging liquid, in the distillate obtained after concentrated, concentration of nitric acid is 0.7mol/L after measured, and in concentrated solution, concentration of nitric acid is 6mol/L, and copper ion concentration is 151g/L.Then in concentrated solution, H is added
2sO
4massfraction is the sulfuric acid of 90%, produces a large amount of cupric sulfate pentahydrate crystallizations after being placed into room temperature, itself and liquid separation is obtained supernatant liquor and copper sulfate precipitates.Supernatant liquor after this separation is salpeter solution, in this solution, concentration of nitric acid is 15mol/L, copper ion concentration is 33g/L, become by this solution concentration of nitric acid to be the regenerated liquid of 10mol/L with distillate Mixed adjustment, cupric ion in this regenerated liquid only has 18g/L, meets the requirement as the reuse of cupric nitric acid stripping and hanging liquid completely.
The copper sulfate obtained precipitation (cupric sulfate pentahydrate) is obtained oxygen, copper and sulfuric acid according to the operational condition electrolysis of table 1.Turn back to after the sulphuric acid concentration that electrolysis is obtained in concentrated solution and be used for being obtained by reacting cupric sulfate pentahydrate precipitation and salpeter solution, realize the recycling of resource.By produce with sulfuric acid mist oxygen by spray column by pH value be 8 ~ 13 sodium hydroxide neutralizing treatment after be discharged in air, avoid contaminate environment.
Embodiment 4
Certain wiring board produces stripping and hanging section, opening cylinder concentration of nitric acid is 5mol/L, under the situation of continuous strip, copper ion concentration raises, and the concentration of nitric acid also declines thereupon, when concentration of nitric acid reduces to 3mol/L, adding a small amount of high density nitric acid adjustment concentration of nitric acid is 5mol/L, stops using when copper ion concentration reaches 90g/L time.
Through waste collection, it is 58 DEG C in the temperature of underpressure distillation, under the condition of vacuum tightness-0.09MPa, cupric nitric acid stripping and hanging liquid is carried out underpressure distillation and obtains distillate and concentrated solution, the volume of concentrated solution is made to be 3/4 of the volume of former cupric nitric acid stripping and hanging liquid, in the distillate obtained after concentrated, concentration of nitric acid is 0.7mol/L after measured, and in concentrated solution, concentration of nitric acid is 7mol/L, and copper ion concentration is 150g/L.Then in concentrated solution, H is added
2sO
4massfraction is the sulfuric acid of 85%, produces a large amount of cupric sulfate pentahydrate crystallizations after being placed into room temperature, itself and liquid separation is obtained supernatant liquor and copper sulfate precipitates.Supernatant liquor after this separation is salpeter solution, and in this solution, concentration of nitric acid is 14mol/L, and copper ion concentration is 33g/L, is become by solution concentration of nitric acid to be the regenerated liquid of 6mol/L with distillate Mixed adjustment.Copper ion concentration in this regenerated liquid only has 6g/L, meets the requirement as the reuse of cupric nitric acid stripping and hanging liquid completely.
The copper sulfate obtained precipitation (cupric sulfate pentahydrate) is obtained oxygen, copper and sulfuric acid according to the operational condition electrolysis of table 1.Turn back to after the sulphuric acid concentration that electrolysis is obtained in concentrated solution and be used for being obtained by reacting cupric sulfate pentahydrate precipitation and salpeter solution, realize the recycling of resource.By produce with sulfuric acid mist oxygen by spray column by pH value be 8 ~ 13 sodium hydroxide neutralizing treatment after be discharged in air, avoid contaminate environment.
Embodiment 5
Certain wiring board produces stripping and hanging section, and opening cylinder concentration of nitric acid is 10mol/L, and under the situation of continuous strip, copper ion concentration raises, and the concentration of nitric acid also declines thereupon, stops using when concentration of nitric acid reduces to 2.5mol/L time, and at this moment its copper ion concentration is about 69g/L.
Through waste collection, it is 70 DEG C in the temperature of underpressure distillation, under the condition of vacuum tightness 0.07MPa, cupric nitric acid stripping and hanging liquid is carried out underpressure distillation and obtains distillate and concentrated solution, the volume of concentrated solution is made to be the half of the volume of former cupric nitric acid stripping and hanging liquid, in the distillate obtained after concentrated, concentration of nitric acid is 1.5mol/L after measured, and in concentrated solution, concentration of nitric acid is 8mol/L, and copper ion concentration is 148g/L.Then in concentrated solution, H is added
2sO
4massfraction is the sulfuric acid of 98%, produces a large amount of cupric sulfate pentahydrate crystallizations after being placed into room temperature, itself and liquid separation is obtained supernatant liquor and copper sulfate precipitates.Supernatant liquor after this separation is salpeter solution, in this solution, concentration of nitric acid is 14mol/L, copper ion concentration is 30g/L, become by this solution concentration of nitric acid to be the regenerated liquid of 8mol/L with distillate Mixed adjustment, cupric ion in this regenerated liquid only has 16g/L, meets the requirement as the reuse of cupric nitric acid stripping and hanging liquid completely.
The copper sulfate obtained precipitation (cupric sulfate pentahydrate) is obtained oxygen, copper and sulfuric acid according to the operational condition electrolysis of table 1.Turn back to after the sulphuric acid concentration that electrolysis is obtained in concentrated solution and be used for being obtained by reacting cupric sulfate pentahydrate precipitation and salpeter solution, realize the recycling of resource.By produce with sulfuric acid mist oxygen by spray column by pH value be 8 ~ 13 sodium hydroxide neutralizing treatment after be discharged in air, avoid contaminate environment.
The profit of cupric nitric acid stripping and hanging liquid regeneration treating method is adjusted below with the copper of final electrolysis.
With an electrolyzer, often produce copper 2 tons meter per month, the detail of table 2 cost needed for electrolytic copper.
Cost needed for table 2 electrolysis copper per ton
With the cupric nitric acid stripping and hanging liquid manipulation of regeneration engineering concrete analysis cost benefit that a project total cost is 800,000 yuan, specific as follows:
One, the basic condition of this project:
Project total cost is 800,000 yuan;
The quantum of output of cupric nitric acid stripping and hanging liquid is about 50 tons/month, and cupric is 50g/L;
As cupric nitric acid stripping and hanging liquid is concentrated half volume (namely 25 tons), then the concentrated solution obtained is 25 tons, and so evaporating water per ton needs 200 yuan of 25 × 200=5000 units;
Monthly output copper amount: 50 tons × 0.05 ton copper/ton waste liquid=2.5 ton (output copper)
Extract electrolytic copper average price in 50000 yuan/ton
Two, the output cost of copper per ton is produced:
Electrolysis running cost: water power, the cost such as artificial: 5700 yuan/ton
Evaporation expense: 5000 yuan
Value added tax: 17%, then 50000 yuan/ton of copper × 0.17=8500 units
Three, the total production cost of copper per ton is produced:
8500 yuan+the evaporation of 5700 yuan/ton of copper cost+taxes takes 2500=1.67 ten thousand yuan/ton of copper
Four, the gross profits of copper per ton is produced:
50000 yuan-1.67 ten thousand yuan=3.33 ten thousand yuan/ton
Five, the cost that copper per ton is saved is produced:
Save the price of nitric acid: 1 ton of copper needs 20 tons of liquid medicine, and nitric acid need with 10 tons, 2300 yuan/ton, nitric acid per ton, then save nitric acid price 10 tons × 2300=23000 unit
Six, the gross profits of copper per ton is produced
Yuan+2.3 ten thousand yuan=5.63 ten thousand yuan, copper profit per ton+cost-saving=3.33 ten thousand
According to above data, equipment output profit is monthly 2.5 tons × 5.63=14 ten thousand yuan, then can obtain 168.9 ten thousand yuan of incomes every year.
In sum, adopt this cupric nitric acid stripping and hanging liquid regeneration treating method, cupric ion in cupric nitric acid stripping and hanging liquid can not only be settled, its component can not be destroyed again, after finely tuning its concentration, production line can be returned continue to use, make that hanger strip operation becomes pollution-free, the cleaner production operation of Zero discharge, and with low cost.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a cupric nitric acid stripping and hanging liquid regeneration treating method, is characterized in that, comprising:
Cupric nitric acid stripping and hanging liquid underpressure distillation process is obtained distillate and concentrated solution;
Sulfuric acid is joined in described concentrated solution and be obtained by reacting cupric sulfate pentahydrate precipitation and salpeter solution;
Described distillate and described salpeter solution are mixed to get regenerated liquid.
2. cupric nitric acid stripping and hanging liquid regeneration treating method as claimed in claim 1, is characterized in that, also comprise the steps: described cupric sulfate pentahydrate electrolysis to obtain oxygen, copper and sulfuric acid.
3. cupric nitric acid stripping and hanging liquid regeneration treating method as claimed in claim 2, is characterized in that, join in described concentrated solution and react after also comprising the steps: the sulphuric acid concentration described electrolysis obtained.
4. cupric nitric acid stripping and hanging liquid regeneration treating method as claimed in claim 2 or claim 3, is characterized in that, also comprises the steps: containing sulfuric acid mist in described oxygen, by described sulfuric acid mist and sodium hydroxide solution neutralization, keeps the pH value of described N-process to be 8 ~ 13.
5. cupric nitric acid stripping and hanging liquid regeneration treating method as claimed in claim 1, is characterized in that: described regenerated liquid as decoating liquid for the production of printed circuit board coppered wire.
6. cupric nitric acid stripping and hanging liquid regeneration treating method as claimed in claim 1, it is characterized in that, the processing parameter of described underpressure distillation is: the temperature of described underpressure distillation is 55 ~ 70 DEG C, and the vacuum tightness of described underpressure distillation is-0.09 ~ 0.07MPa.
7. the cupric nitric acid stripping and hanging liquid regeneration treating method as described in claim 1 or 6, it is characterized in that: in described distillate, concentration of nitric acid is below 1.5mol/L, in described concentrated solution, copper ion concentration is more than 100g/L, and in described concentrated solution, concentration of nitric acid is 6 ~ 8mol/L.
8. cupric nitric acid stripping and hanging liquid regeneration treating method as claimed in claim 1, is characterized in that: described concentration sulfuric acid being joined in described concentrated solution the described sulfuric acid be obtained by reacting in cupric sulfate pentahydrate precipitation and salpeter solution step is 80 ~ 98wt.%.
9. cupric nitric acid stripping and hanging liquid regeneration treating method as claimed in claim 1, it is characterized in that: in described regenerated liquid, concentration of nitric acid is 6 ~ 10mol/L, copper ion concentration is 6 ~ 18g/L.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108588734A (en) * | 2018-07-09 | 2018-09-28 | 南京舜业环保科技有限公司 | A kind of low concentration nitric acid deplating liquid indirect regeneration and circulation regeneration method |
| CN115196667A (en) * | 2022-09-15 | 2022-10-18 | 阮氏化工（常熟）有限公司 | Method and device for producing copper sulfate and nitric acid by using stripping and hanging liquid |
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| CN115196667B (en) * | 2022-09-15 | 2023-01-13 | 阮氏化工（常熟）有限公司 | Method and device for producing copper sulfate and nitric acid by using stripping and hanging liquid |
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Application publication date: 20160330 |