CN108480647A - A kind of recoverying and utilizing method of nano-Ag particles waste liquid - Google Patents
A kind of recoverying and utilizing method of nano-Ag particles waste liquid Download PDFInfo
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- CN108480647A CN108480647A CN201810064851.0A CN201810064851A CN108480647A CN 108480647 A CN108480647 A CN 108480647A CN 201810064851 A CN201810064851 A CN 201810064851A CN 108480647 A CN108480647 A CN 108480647A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/02—Obtaining noble metals by dry processes
- C22B11/021—Recovery of noble metals from waste materials
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/005—Separation by a physical processing technique only, e.g. by mechanical breaking
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a kind of recoverying and utilizing methods of nano-Ag particles waste liquid, including：Collect waste liquid step：Nano-Ag particles stoste is subjected to centrifugal treating, outwells supernatant liquid, the liquid of middle and bottom layers muddiness is collected, obtains waste liquid；Whipping step：Waste liquid is stirred evenly, the content of the silver in waste liquid is calculated；Reaction step：Waste liquid is placed in draught cupboard, a concentration of 5% ammonium hydroxide is added while stirring, is stirred after adding ammonium hydroxide, is then allowed to stand to obtain reaction solution；Centrifugation step：Reaction solution is centrifuged to obtain centrifugate；Baking step：Centrifugate is dried to obtain silver bullion；Grinding steps：Silver bullion is ground pulverization process, obtains a micron Argent grain.The present invention can be in the simple and effective waste liquid to nano-Ag particles silver be recycled, reduce the waste of silver, it avoids polluting the environment, while greatly reducing the usage amount of the oxidants such as hydrogen peroxide, have the characteristics that the rate of recovery is high, at low cost and easy to operate.
Description
Technical field
The present invention relates to a kind of recoverying and utilizing methods of resource, and in particular to a kind of recycling of nano-Ag particles waste liquid
Method.
Background technology
The recycling of nano-Ag particles waste liquid refer to nano-Ag particles purification, extraction etc. during generate it is a large amount of
Waste liquid carry out certain processing after, main component-nano-Ag particles in Recycling of waste liquid.Nano silver after processing is polymerized to
The irregular aggregate of micron and the above grain size, the silver bullion recycled is using grinding into micron Argent grain.Micron silver
Particle is the Argent grain that its particle diameter is in micron level, has lasting antibacterial effect, is suitable for personal nursing, medical,
The fields such as medicinal and animal health product.
It is understood that the fast development and the extensive use on each field of nano material science and technology, but also inevitably
Waste liquid when being released in environment there are many nano material, for example preparing nano material, is then enriched in life by food chain
In object, toxic effect is generated.At present the whole world to nano material in use, wherein the usage amount of nano silver be highest, phase
Its waste liquid generated when prepared by factory and laboratory answered will be larger.It is related research shows that Ag+Background in the environment is dense
Spend extremely low, the concentration range in natural water only reaches 0.03~500ngL-1, but Ag+ has persistence in the environment
With biological accumulation effect, there is very strong toxicity to aquatile, if some miniature phytoplanktons are by 50~100ngL-1Ag
After pollution, fecundity is suppressed.And prepare in the waste liquid of AgNPs that often the content of Ag is up to 1~4gL-1If by
Being discharged into caused by environment influences to will be unable to, it is expected that so the present invention is necessary to the recycling of nano-Ag particles.
Choi's etc. research shows that AgNPs can inhibit the growth of nitrobacteria, in 1mgL-1Concentration under, AgNPs is to Autotrophic nitrification
The respiration inhibition rate of bacterium is up to about 86%；Miao etc. has shown that artificial synthesized AgNPs seriously inhibits marine diatom by research
Cell growth, photosynthesis and the Chlorophyll synthesis of (Thalassiosira weissflogii)；Jang etc. exists carp
Exposure 7d in the nano silver suspending liquid of (0.62 ± 0.12) mg/L has found that the amount that silver is distributed in fish Different Organs is liver from big to small
Dirty, the fish gill, gastrointestinal tract, skeletal muscle, brain, blood；After purifying 2 weeks, the silver concentration of liver, the fish gill and gastrointestinal tract site is still
It is higher.And there are the activity that the AgNPs in fish body can further suppress certain enzymes in fish body, interfere normal ion-select electrode and god
After the adjustment, or even cause fish embryo lopsided, reduce the survival rate etc. of embryo.Then transmission of these fishes by food chain, biology
Enrichment etc. will be enriched in human body to generate a series of toxic effects after being eaten by our mankind.Some researches show that nanometers
Argent grain grain size in 20~80nm poisonous effect mainly by its dissolving release silver ion causes, and grain size it is smaller as 10nm when
It is easier to be utilized by organism compared with silver ion, poisonous effect bigger.And the preparation process of current nano-Ag particles both at home and abroad
In, the nano-Ag particles that left behind in waste liquid are mainly 30nm below, because below to 30nm in current technology
The separating-purifying of nano-Ag particles etc. is still relatively difficult.So being reunited with the nano-Ag particles that the method for the present invention keeps these smaller
To reduce its content in waste liquid it is necessary at larger aggregate.
Invention content
For overcome the deficiencies in the prior art, the purpose of the present invention is to provide a kind of recycling of nano-Ag particles waste liquid profits
With method, the silver that it can be in the simple and effective waste liquid to nano-Ag particles is recycled, and reduces the waste of silver, is avoided pair
Environment pollutes, while greatly reducing the usage amount of the oxidants such as hydrogen peroxide, and operation high, at low cost with the rate of recovery
Convenient feature.
The purpose of the present invention adopts the following technical scheme that realization：
A kind of recoverying and utilizing method of nano-Ag particles waste liquid, which is characterized in that including：
Collect waste liquid step：Nano-Ag particles stoste is subjected to 30-60min in the centrifuge of 4000-7000r/mind
Centrifugal treating, will appear obvious lamination in centrifugate at this time, outwell upper layer transparent liquid, collect the liquid of bottom muddiness
Body, as waste liquid；
Whipping step：Waste liquid is stirred evenly, the solid content of waste liquid is measured, the total weight of waste liquid is weighed up, calculates waste liquid
In silver content；
Reaction step：Waste liquid is placed in draught cupboard, a concentration of 5% ammonium hydroxide is added while stirring, it is laggard to add ammonium hydroxide
Row stirring, mixing speed 100-300r/min, mixing time 5-15min are then allowed to stand 1-3 days, obtain reaction solution；
Centrifugation step：Reaction solution is centrifuged, centrifugate is obtained；
Baking step：Centrifugate is dried, silver bullion is obtained；
Grinding steps：Silver bullion is ground pulverization process, obtains a micron Argent grain.
Further, it collects in waste liquid step, the number of centrifugation is 5 times, will centrifuge obtained waste liquid every time and is integrated into one
It rises, the waste liquid of 0.5-1L is recovered to per 10L nano-Ag particles stostes.
Further, in whipping step, mixing speed 100-300r/min, mixing time 5-15min.
Further, in reaction step, the mass volume ratio of silver and ammonium hydroxide in waste liquid is (7-21):(20-50)g/ml.
Further, in reaction step, mixing speed 200r/min, mixing time 10min are then allowed to stand 2 days.
Further, in reaction step, a concentration of 5% ammonium hydroxide is obtained by the way of extemporaneous preparation, specific preparation side
Method is as follows：A certain amount of a concentration of 28% ammonium hydroxide is taken to be diluted to a concentration of 5% ammonium hydroxide.
Further, in centrifugation step, centrifugal speed 5000-7000r/min, centrifugation time 40-50min.
Further, in centrifugation step, centrifugal speed 6000r/min, centrifugation time 45min.
Further, in baking step, drying temperature is 120-150 DEG C, drying time 1-2h.
Further, in baking step, drying temperature is 130 DEG C, drying time 1.5h.
Compared with prior art, the beneficial effects of the present invention are：
The recoverying and utilizing method of the present invention successively through collection waste liquid step, whipping step, reaction step, centrifugation step,
Baking step and grinding steps obtain a micron Argent grain, and silver that can be in the simple and effective waste liquid to nano-Ag particles recycles
It utilizes, reduces the waste of silver, avoid polluting the environment, while greatly reducing the usage amount of the oxidants such as hydrogen peroxide,
Have the characteristics that the rate of recovery is high, at low cost and easy to operate.
Generally speaking, AgNPs is direct or indirect can be discharged into environment, it will cause influence that can not be estimated.And pass through
The method of the present invention makes AgNPs be agglomerated into the aggregate of micron and the above grain size, to eliminate spies of the AgNPs in Nano grade
Different physicochemical characteristics substantially reduces silver to the toxicity of environment etc., is carried out at the same time recycling and also increases the utilization rate of silver and additional
Application value.
Specific implementation mode
In the following, in conjunction with specific implementation mode, the present invention is described further, it should be noted that is do not collided
Under the premise of, new embodiment can be formed between various embodiments described below or between each technical characteristic in any combination.This reality
Apply employed in example to material be commercially available.
A kind of recoverying and utilizing method of nano-Ag particles waste liquid, including：
Collect waste liquid step：Nano-Ag particles stoste is subjected to 30-60min in the centrifuge of 4000-7000r/mind
Centrifugal treating, will appear obvious lamination in centrifugate at this time, outwell upper layer transparent liquid, collect the liquid of bottom muddiness
Body, as waste liquid；Because the maximum speed of 6 × 1000ml of current high-speed high capacity refrigerated centrifuge both domestic and external is 8000r/
Min, and be difficult to be centrifuged out for the relatively low nano-Ag particles of grain size (grain size is less than 30nm), unless making turning for centrifuge
Speed reaches 13000r/min or more, but the stoste for reaching the centrifugation function processing of this centrifugal rotational speed is few, is probably 6 ×
10ml, this is used in for a factory of enterprise just without great applying value.But use large capacity instead and one can be caused
The loss of the small nano-Ag particles of a little grain sizes, they are mainly distributed on centrifugal bottle bottom, so being recycled to it, also keep away
Exempt from accident and be discharged in environment to impact；
Whipping step：Waste liquid is stirred evenly, the solid content of waste liquid is measured, the total weight of waste liquid is weighed up, calculates waste liquid
In silver content；Silver-colored content, is also possible to some PVP etc., passes through this certainly in the step liquid waste solution that has been mainly rough
Kind method will be seen that recovery percentage silver-colored in Recycling of waste liquid.
Reaction step：Waste liquid is placed in draught cupboard, a concentration of 5% ammonium hydroxide is added while stirring, it is laggard to add ammonium hydroxide
Row stirring, mixing speed 100-300r/min, mixing time 5-15min are then allowed to stand 1-3 days, obtain reaction solution；
Centrifugation step：Reaction solution is centrifuged, centrifugate is obtained；
Baking step：Centrifugate is dried, silver bullion is obtained.
Grinding steps：Silver bullion is ground pulverization process, obtains a micron Argent grain.
As preferred embodiment, further, collect in waste liquid step, the number of centrifugation is 5 times, will be centrifuged every time
Obtained waste liquid is integrated together, and the waste liquid of 0.5-1L is recovered to per 10L nano-Ag particles stostes.In this step, time of centrifugation
Number is 5 times, will centrifuge obtained waste liquid every time and is integrated together, and about consumes the solvent of 15L or more in this way, and passes through and collect
This process of dirty solution makes it be concentrated into 0.5-1L, largely reduces the processing work in later stage.
As preferred embodiment, in whipping step, mixing speed 100-300r/min, mixing time 5-
15min。
As preferred embodiment, in reaction step, the mass volume ratio of silver and ammonium hydroxide in waste liquid is (7-21):
(20-50)g/ml。
As preferred embodiment, in reaction step, mixing speed 200r/min, mixing time 10min, then
Stand 2 days.
As preferred embodiment, in reaction step, a concentration of 5% ammonium hydroxide is obtained by the way of extemporaneous preparation,
Specific preparation method is as follows：A certain amount of a concentration of 28% ammonium hydroxide is taken to be diluted to a concentration of 5% ammonium hydroxide.
As preferred embodiment, in centrifugation step, centrifugal speed 5000-7000r/min, centrifugation time 40-
50min。
As preferred embodiment, in centrifugation step, centrifugal speed 6000r/min, centrifugation time 45min.
As preferred embodiment, in baking step, drying temperature is 120-150 DEG C, drying time 1-2h.
As preferred embodiment, in baking step, drying temperature is 130 DEG C, drying time 1.5h.
Embodiment 1：
A kind of recoverying and utilizing method of nano-Ag particles waste liquid, including：
Collect waste liquid step：10L nano-Ag particles stoste is subjected to 30- in the centrifuge of 4000-7000r/mind
The centrifugal treating of 60min will appear obvious lamination at this time in centrifugate, outwell upper layer transparent liquid, and it is muddy to collect bottom
Turbid liquid obtains 1.2L waste liquids；
Whipping step：Waste liquid is stirred evenly, the solid content of waste liquid is measured, the total weight of waste liquid is weighed up, calculates waste liquid
In silver content be 20.1080g；Mixing speed is 100r/min, mixing time 15min；
Reaction step：Waste liquid is placed in draught cupboard, the ammonium hydroxide of 20mL a concentration of 5% is added while stirring, adds ammonium hydroxide
After be stirred, mixing speed 100r/min, mixing time 15min are then allowed to stand 2 days, obtain reaction solution；Wherein, it gives up
The mass volume ratio of silver and ammonium hydroxide in liquid is 20.1080g:20mL；
A concentration of 5% ammonium hydroxide is obtained by the way of extemporaneous preparation, and specific preparation method is as follows：It takes a certain amount of a concentration of
28% ammonium hydroxide is diluted to a concentration of 5% ammonium hydroxide.
Centrifugation step：Reaction solution is centrifuged, centrifugal speed 5000r/min, centrifugation time 50min, obtain from
Heart liquid.
Baking step：Centrifugate is dried, drying temperature is 120 DEG C, and drying time 2h obtains silver bullion.
Grinding steps：Silver bullion is ground pulverization process, obtains a micron Argent grain.
Embodiment 2：
A kind of recoverying and utilizing method of nano-Ag particles waste liquid, including：
Collect waste liquid step：10L nano-Ag particles stoste is subjected to 30- in the centrifuge of 4000-7000r/mind
The centrifugal treating of 60min will appear obvious lamination at this time in centrifugate, outwell upper layer transparent liquid, and it is muddy to collect bottom
Turbid liquid obtains 1.2L waste liquids；
Whipping step：Waste liquid is stirred evenly, the solid content of waste liquid is measured, the total weight of waste liquid is weighed up, calculates waste liquid
In silver content be 8.2711g；Mixing speed is 300r/min, mixing time 5min；；
Reaction step：Waste liquid is placed in draught cupboard, the ammonium hydroxide of 30mL a concentration of 5% is added while stirring, adds ammonium hydroxide
After be stirred, mixing speed 100r/min, mixing time 10min are then allowed to stand 1 day, obtain reaction solution；Wherein, it gives up
The mass volume ratio of silver and ammonium hydroxide in liquid is 8.2711g:30mL；
A concentration of 5% ammonium hydroxide is obtained by the way of extemporaneous preparation, and specific preparation method is as follows：It takes a certain amount of a concentration of
28% ammonium hydroxide is diluted to a concentration of 5% ammonium hydroxide.
Centrifugation step：Reaction solution is centrifuged, centrifugal speed 7000r/min, centrifugation time 40min, obtain from
Heart liquid.
Baking step：Centrifugate is dried, drying temperature is 150 DEG C, and drying time 1h obtains silver bullion.
Grinding steps：Silver bullion is ground pulverization process, obtains a micron Argent grain.
Embodiment 3：
A kind of recoverying and utilizing method of nano-Ag particles waste liquid, including：
Collect waste liquid step：10L nano-Ag particles stoste is subjected to 30- in the centrifuge of 4000-7000r/mind
The centrifugal treating of 60min will appear obvious lamination at this time in centrifugate, outwell upper layer transparent liquid, and it is muddy to collect bottom
Turbid liquid obtains 1.2L waste liquids；
Whipping step：Waste liquid is stirred evenly, the solid content of waste liquid is measured, the total weight of waste liquid is weighed up, calculates waste liquid
In silver content be 7.5900g；Mixing speed is 300r/min, mixing time 5min；；
Reaction step：Waste liquid is placed in draught cupboard, the ammonium hydroxide of 30mL a concentration of 5% is added while stirring, adds ammonium hydroxide
After be stirred, mixing speed 200r/min, mixing time 10min are then allowed to stand 2 days, obtain reaction solution；Wherein, it gives up
The mass volume ratio of silver and ammonium hydroxide in liquid is 7.5900g:30mL；
A concentration of 5% ammonium hydroxide is obtained by the way of extemporaneous preparation, and specific preparation method is as follows：It takes a certain amount of a concentration of
28% ammonium hydroxide is diluted to a concentration of 5% ammonium hydroxide.
Centrifugation step：Reaction solution is centrifuged, centrifugal speed 6000r/min, centrifugation time 45min, obtain from
Heart liquid.
Baking step：Centrifugate is dried, drying temperature is 130 DEG C, and drying time 1.5h obtains silver bullion.
Grinding steps：Silver bullion is ground pulverization process, obtains a micron Argent grain.
Embodiment 4：
A kind of recoverying and utilizing method of nano-Ag particles waste liquid, including：
Collect waste liquid step：10L nano-Ag particles stoste is subjected to 30- in the centrifuge of 4000-7000r/mind
The centrifugal treating of 60min will appear obvious lamination at this time in centrifugate, outwell upper layer transparent liquid, and it is muddy to collect bottom
Turbid liquid obtains 1.2L waste liquids；
Whipping step：Waste liquid is stirred evenly, the solid content of waste liquid is measured, the total weight of waste liquid is weighed up, calculates waste liquid
In silver content be 19.866g；Mixing speed is 200r/min, mixing time 15min；
Reaction step：Waste liquid is placed in draught cupboard, the ammonium hydroxide of 50ml a concentration of 5% is added while stirring, adds ammonium hydroxide
After be stirred, mixing speed 200r/min, mixing time 10min are then allowed to stand 1 day, obtain reaction solution；Wherein, it gives up
The mass volume ratio of silver and ammonium hydroxide in liquid is 19.866g:50ml；
A concentration of 5% ammonium hydroxide is obtained by the way of extemporaneous preparation, and specific preparation method is as follows：It takes a certain amount of a concentration of
28% ammonium hydroxide is diluted to a concentration of 5% ammonium hydroxide.
Centrifugation step：Reaction solution is centrifuged, centrifugal speed 6000r/min, centrifugation time 50min, obtain from
Heart liquid.
Baking step：Centrifugate is dried, drying temperature is 150 DEG C, and drying time 1h obtains silver bullion.
Grinding steps：Silver bullion is ground pulverization process, obtains a micron Argent grain.
Comparative example 1：
A kind of hydrogen peroxide includes the following steps the processing method of nano-Ag particles waste liquid：
1) the 10L waste liquids generated in nano-Ag particles production process are poured into waste liquid tank；
2) hydrogen peroxide is added into waste liquid tank, a concentration of 30% hydrogen peroxide 2000-3000ml need to be added；
3) it after waste liquid in waste liquid tank becomes clear by muddiness, exhausts.
Measure of merit
By taking the waste liquid that 10L nano-Ag particles stostes generate as an example.Need to consume a concentration of 30% peroxide using comparative example 1
Change hydrogen 2000-3000ml, and the method for using embodiment 1-4 is handled, then only needs the ammonium hydroxide of 20-50ml a concentration of 5%, greatly
The big usage amount for reducing raw material.And it is also reduced to the potential threat of environment to the recycling of Argent grain and is increased additional
Income.
After 1-4 of the embodiment of the present invention handles nano-Ag particles waste liquid, by measuring and calculating, the following table 1 number is obtained
According to：
Table 1
| Recycle the quality (g) of silver | Measure content (g) silver-colored in waste liquid | The rate of recovery (%) | |
| Embodiment 1 | 10.3677 | 20.1080 | 51.56 |
| Embodiment 2 | 5.7370 | 8.2711 | 69.36 |
| Embodiment 3 | 6.5028 | 7.5900 | 85.67 |
| Embodiment 4 | 15.1769 | 19.866 | 76.39 |
As can be seen from Table 1, the rate of recovery of embodiment 1-4 reaches 50% or more, the especially rate of recovery of embodiment 3 most
Height reaches 85.67%.
The above embodiment is only the preferred embodiment of the present invention, and the scope of protection of the present invention is not limited thereto,
The variation and replacement for any unsubstantiality that those skilled in the art is done on the basis of the present invention belong to institute of the present invention
Claimed range.
Claims (10)
1. a kind of recoverying and utilizing method of nano-Ag particles waste liquid, which is characterized in that including：
Collect waste liquid step：Nano-Ag particles stoste is carried out in the centrifuge of 4000-7000r/mind 30-60min from
Heart processing, will appear obvious lamination at this time in centrifugate, outwell upper layer transparent liquid, collect the liquid of bottom muddiness,
As waste liquid；
Whipping step：Waste liquid is stirred evenly, the solid content of waste liquid is measured, the total weight of waste liquid is weighed up, calculates in waste liquid
The content of silver；
Reaction step：Waste liquid is placed in draught cupboard, a concentration of 5% ammonium hydroxide is added while stirring, is stirred after adding ammonium hydroxide
It mixes, mixing speed 100-300r/min, mixing time 5-15min is then allowed to stand 0.5-3 days, obtains reaction solution；
Centrifugation step：Reaction solution is centrifuged, centrifugate is obtained；
Baking step：Centrifugate is dried, silver bullion is obtained；
Grinding steps：Silver bullion is ground pulverization process, obtains a micron Argent grain.
2. the recoverying and utilizing method of nano-Ag particles waste liquid as described in claim 1, which is characterized in that collect waste liquid step
In, the number of centrifugation is 5 times, will centrifuge obtained waste liquid every time and is integrated together, and is recovered to per 10L nano-Ag particles stostes
The waste liquid of 0.5-1L.
3. the recoverying and utilizing method of nano-Ag particles waste liquid as described in claim 1, which is characterized in that in whipping step, stir
It is 100-300r/min, mixing time 5-15min to mix speed.
4. the recoverying and utilizing method of nano-Ag particles waste liquid as described in claim 1, which is characterized in that in reaction step, give up
The mass volume ratio of silver and ammonium hydroxide in liquid is (7-21):(20-50)g/ml.
5. the recoverying and utilizing method of nano-Ag particles waste liquid as described in claim 1, which is characterized in that in reaction step, stir
It is 200r/min, mixing time 10min to mix speed, is then allowed to stand 2 days.
6. the recoverying and utilizing method of nano-Ag particles waste liquid as described in claim 1, which is characterized in that dense in reaction step
Degree is obtained for 5% ammonium hydroxide by the way of extemporaneous preparation, and specific preparation method is as follows：Take a certain amount of a concentration of 28% ammonium hydroxide
It is diluted to a concentration of 5% ammonium hydroxide.
7. the recoverying and utilizing method of nano-Ag particles waste liquid as described in claim 1, which is characterized in that in centrifugation step, from
Heart speed is 5000-7000r/min, centrifugation time 40-50min.
8. the recoverying and utilizing method of nano-Ag particles waste liquid as claimed in claim 7, which is characterized in that in centrifugation step, from
Heart speed is 6000r/min, centrifugation time 45min.
9. the recoverying and utilizing method of nano-Ag particles waste liquid as described in claim 1, which is characterized in that in baking step, dry
Dry temperature is 120-150 DEG C, drying time 1-2h.
10. the recoverying and utilizing method of nano-Ag particles waste liquid as claimed in claim 9, which is characterized in that in baking step, dry
Dry temperature is 130 DEG C, drying time 1.5h.
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