CN104404256B - The method of silver in waste is reclaimed in a kind of environmental protection - Google Patents
The method of silver in waste is reclaimed in a kind of environmental protection Download PDFInfo
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- CN104404256B CN104404256B CN201410711629.7A CN201410711629A CN104404256B CN 104404256 B CN104404256 B CN 104404256B CN 201410711629 A CN201410711629 A CN 201410711629A CN 104404256 B CN104404256 B CN 104404256B
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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
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Abstract
The invention discloses a kind of method that silver in waste is reclaimed in environmental protection.By using yeast powder absorption silver in waste ion, providing under illumination condition, utilizing fulvic acid that the silver ion reduction of yeast surface is become Argent grain; Separated and collected yeast after natural sedimentation; Ultrasonication yeast thalline; Argent grain is collected in centrifugation.The method reclaims silver in waste, and environmental protection is simple to operate, can effectively by the silver in waste water and other metal separation, and the rate of recovery is high, and processing cost is low, can realize the recycle of resource.
Description
Technical field
The present invention relates to a kind of method that silver in waste is reclaimed in environmental protection
background technology:
Silver has excellent Wuli-Shili-Renli system approach, and silver and compound thereof are widely used in production, various fields of recent life.Such as, in electron device, the normal silver that uses is as contact material, and silver halide is then a kind of important sensitive materials, medically, commonly uses Silver Nitrate as sterilant, etc.Discarded often enters the ecosystem in the form of an ion containing silver in silver products.Due to, there is certain environment eco-toxicity in silver ions, when silver ion content exceedes finite concentration in environment, will damage ecotope, the silver ion content particularly in water exceedes finite concentration, will cause very large harm to Shui Zhong microflora.In addition, in the trade effluent of the plant emissions such as silver smeltery, Electroplate Factory, silver concentration content is high, if directly discharged without recycling, not only contaminate environment, and causes the wasting of resources.Therefore, reclaim the silver of waste water particularly in trade effluent, for maintaining ecological balance, promote resource reclaim, the recycle of Support Resource, it is significant to save Financial cost.At present, the method power consumption of reclaiming silver in waste is high, and the rate of recovery is low, often uses chemical reagent, easily causes secondary pollution, and the method therefore developing a kind of environmental protection recovery silver in waste is very meaningful.
summary of the invention:
The object of the invention is to provide a kind of less energy-consumption, and the method for the recovery silver in waste of environmental protection.
The technical solution used in the present invention is: the method for silver in waste is reclaimed in a kind of environmental protection, comprises the following steps:
(1) pre-treatment silver-containing waste water: regulate silver-containing waste water pH value to pH5.0-6.0 with nitric acid, heating silver-containing waste water is to 30-50 DEG C;
(2) add yeast powder, stir: be how many according to silver in waste ion content, add the yeast powder of 1-10g/L, under 50-150rpm/min condition, stir 24-48h;
(3) add fulvic acid, stir: add fulvic acid 0.1-0.5g/L, under 50-150rpm/min condition, stir 24h;
(4) stir under illumination condition: use source of artificial light to provide illumination, light intensity is 50000-200000Lux, light source distance waste water liquid level 10-20cm, illumination 24-48h; Or use lamp to provide illumination, light intensity is 5000-50000Lux, illumination 48-96h; In During Illumination, 50-150rpm/min rotating speed stirs;
(5) thalline is collected: stop stirring, natural sedimentation yeast 1-5h, collect yeast;
(6) pulverize yeast thalline: ultrasonication yeast, ultrasonic power is 50-100W, and ultrasonic time is 0.5-2h;
(7) collected by centrifugation Argent grain: use the method for centrifugation that Argent grain is precipitated, centrifugal rotational speed 4000-8000rpm/min, realizes the recovery of silver in waste.
Further optimization, the preferable temperature in step (1) 30 DEG C.
Further optimization, in step (2), when silver in waste ion content is less than 20mg/L, adds yeast powder 1-5g/L; When silver in waste ion is greater than 20mg/L, add yeast powder 5-10g/L.
Further optimization, in step (3), when silver in waste ion content is less than 20mg/L, adding fulvic acid is 0.1-0.3g/L; When silver in waste ion is greater than 20mg/L, adding fulvic acid is 0.3-0.5g/L.
Accompanying drawing explanation
Fig. 1 is; Yeast photo (becoming light red from white) after having adsorbed Argent grain.
Fig. 2 is: the yeast scanning electron microscope (SEM) photograph having adsorbed Argent grain.
concrete case study on implementation:
Embodiment 1
A method for silver in waste is reclaimed in environmental protection, comprises the following steps:
(1) pre-treatment silver-containing waste water: regulate silver-containing waste water pH value to pH5.0 with nitric acid, heating silver-containing waste water to 30 DEG C;
(2) add yeast powder, stir: silver in waste ion content 20mg/L, adds yeast powder 2g/L, stirs 24h under 50rpm/min condition;
(3) add fulvic acid, stir: add fulvic acid 0.1g/L, under 50rpm/min condition, stir 24h;
(4) stir under illumination condition: use source of artificial light to provide illumination, light intensity is 50000Lux, light source distance waste water liquid level 10cm, illumination 24h;
(5) thalline is collected: stop stirring, natural sedimentation yeast 1h, collect yeast; Scanning electronic microscope characterizes, as Fig. 2.
(6) yeast thalline is pulverized: ultrasonication yeast, ultrasonic power is 50-100W, and ultrasonic time is 0.5h.
(7) collected by centrifugation Argent grain: use the method for centrifugation that Argent grain is precipitated, centrifugal rotational speed 4000rpm/min, realizes the recovery of silver in waste, the rate of recovery 82.1%.
Embodiment 2
A method for silver in waste is reclaimed in environmental protection, comprises the following steps:
(1) pre-treatment silver-containing waste water: regulate silver-containing waste water pH value to pH6.0 with nitric acid, heating silver-containing waste water to 50 DEG C;
(2) add yeast powder, stir: silver in waste ion content 10mg/L, adds yeast powder 4g/L, stirs 48h under 150rpm/min condition;
(3) add fulvic acid, stir: add fulvic acid 0.2g/L, under 150rpm/min condition, stir 24h;
(4) stir under illumination condition: use source of artificial light to provide illumination, light intensity is 50000-200000Lux, light source distance waste water liquid level 20cm, illumination 48h
(5) thalline is collected: stop stirring, natural sedimentation yeast 5h, collect yeast, as Fig. 1.
(6) pulverize yeast thalline: ultrasonication yeast, ultrasonic power is 100W, and ultrasonic time is 2h;
(7) collected by centrifugation Argent grain: use the method for centrifugation that Argent grain is precipitated, centrifugal rotational speed 8000rpm/min, realizes the recovery of silver in waste, the rate of recovery 89.7%.
Embodiment 3
A method for silver in waste is reclaimed in environmental protection, comprises the following steps:
(1) pre-treatment silver-containing waste water: regulate silver-containing waste water pH value to pH5.0 with nitric acid, heating silver-containing waste water to 40 DEG C;
(2) add yeast powder, stir: silver in waste ion content 25mg/L, adds yeast powder 6g/L, stirs 48h under 100rpm/min condition;
(3) add fulvic acid, stir: add fulvic acid 0.4g/L, under 100rpm/min condition, stir 24h;
(4) stir under illumination condition: use lamp to provide illumination, light intensity is 10000Lux, illumination 80h; In During Illumination, 100rpm/min rotating speed stirs;
(5) thalline is collected: stop stirring, natural sedimentation yeast 3h, collect yeast;
(6) pulverize yeast thalline: ultrasonication yeast, ultrasonic power is 80W, and ultrasonic time is 1h;
(7) collected by centrifugation Argent grain: use the method for centrifugation that Argent grain is precipitated, centrifugal rotational speed 6000rpm/min, realizes the recovery of silver in waste, the rate of recovery 76%.
Embodiment 4
A method for silver in waste is reclaimed in environmental protection, comprises the following steps:
(1) pre-treatment silver-containing waste water: regulate silver-containing waste water pH value to pH5.5 with nitric acid, heating silver-containing waste water to 30 DEG C;
(2) add yeast powder, stir: silver in waste ion content 40mg/L, adds yeast powder 10g/L, stirs 36h under 120rpm/min condition;
(3) add fulvic acid, stir: add fulvic acid 0.4g/L, under 80rpm/min condition, stir 24h;
(4) stir under illumination condition: use source of artificial light to provide illumination, light intensity is 150000Lux, light source distance waste water liquid level 20cm, illumination 48h; Or use lamp to provide illumination, light intensity is 30000Lux, illumination 60h; In During Illumination, 100rpm/min rotating speed stirs;
(5) thalline is collected: stop stirring, natural sedimentation yeast 2h, collect yeast;
(6) pulverize yeast thalline: ultrasonication yeast, ultrasonic power is 80W, and ultrasonic time is 1.5h;
(7) collected by centrifugation Argent grain: use the method for centrifugation that Argent grain is precipitated, centrifugal rotational speed 7000rpm/min, realizes the recovery of silver in waste, the rate of recovery 80.9%.
Claims (3)
1. a method for silver in waste is reclaimed in environmental protection, it is characterized in that, comprises the following steps:
(1) pre-treatment silver-containing waste water: regulate silver-containing waste water pH value to pH5.0-6.0 with nitric acid, heating silver-containing waste water is to 30-50 DEG C;
(2) add yeast powder, stir: be how many according to silver in waste ion content, add the yeast powder of 1-10g/L, under 50-150rpm/min condition, stir 24-48h;
(3) add fulvic acid, stir: add fulvic acid 0.1-0.5g/L, under 50-150rpm/min condition, stir 24h,
when silver in waste ion content is less than 20mg/L, adding fulvic acid is 0.1-0.3g/L; When silver in waste ion is greater than 20mg/L, adding fulvic acid is 0.3-0.5g/L;
(4) stir under illumination condition: use source of artificial light to provide illumination, light intensity is 50000-200000Lux, light source distance waste water liquid level 10-20cm, illumination 24-48h; Or use lamp to provide illumination, light intensity is 5000-50000Lux, illumination 48-96h; In During Illumination, 50-150rpm/min rotating speed stirs;
(5) thalline is collected: stop stirring, natural sedimentation yeast 1-5h, collect yeast;
(6) pulverize yeast thalline: ultrasonication yeast, ultrasonic power is 50-100W, and ultrasonic time is 0.5-2h;
(7) collected by centrifugation Argent grain: use the method for centrifugation that Argent grain is precipitated, centrifugal rotational speed 4000-8000rpm/min, realizes the recovery of silver in waste.
2. the method for silver in waste is reclaimed in environmental protection according to claim 1, it is characterized in that, the preferable temperature in step (1) 30 DEG C.
3. the method for silver in waste is reclaimed in environmental protection according to claim 1, it is characterized in that, in step (2), when silver in waste ion content is less than 20mg/L, adds yeast powder 1-5g/L; When silver in waste ion is greater than 20mg/L, add yeast powder 5-10g/L.
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| CN105057693A (en) * | 2015-08-22 | 2015-11-18 | 赵兵 | Nanogold particle preparing method |
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| IL104036A (en) * | 1992-12-09 | 1995-12-08 | Technion Res & Dev Foundation | Process for the removal of metallic cations from effluents |
| EP1412294A1 (en) * | 2001-08-03 | 2004-04-28 | Council of Scientific and Industrial Research | A process for the removal of heavy metals by actinomycete |
| BRPI0605681A (en) * | 2006-09-18 | 2008-05-06 | Unicamp | production process of protein-stabilized silver nanoparticles in the production of antibacterial textile products and the treatment of effluents produced |
| CN101705359B (en) * | 2009-11-10 | 2011-03-09 | 南京信息工程大学 | Method for recovering silver in silver-containing waste water by biological method |
| CN102976459A (en) * | 2012-11-26 | 2013-03-20 | 洪仁作 | Metallurgical wastewater flocculant |
| CN103449577A (en) * | 2013-09-16 | 2013-12-18 | 湖南大学 | Method for efficiently and quickly killing bacteria in water |
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