CN103342423A - Recovery process of rare noble metal in waste water and nano iron reaction device used therein - Google Patents
Recovery process of rare noble metal in waste water and nano iron reaction device used therein Download PDFInfo
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- CN103342423A CN103342423A CN2013102948292A CN201310294829A CN103342423A CN 103342423 A CN103342423 A CN 103342423A CN 2013102948292 A CN2013102948292 A CN 2013102948292A CN 201310294829 A CN201310294829 A CN 201310294829A CN 103342423 A CN103342423 A CN 103342423A
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Abstract
The invention discloses a recovery process of rare noble metal in waste water and a nano iron reaction device used therein. The recovery process comprises the following steps: entering heavy metal waste water into an adjusting pool and then entering into the nano iron reaction device after improvement, adding nano iron in an amount which is 2 to 3 times that of the total content of heavy metal ions of the waste water, and completely stirring and reacting for 20 to 40 min; controlling the adding amount of the nano iron and the reaction time through on-line oxidation-reduction potential (ORP) evaluation; after reaction, entering the output water into a coagulation and precipitation integrated pool to precipitate and separate; entering the output water after precipitate into a water outlet pool through a filter; discharging sludge to a sludge pool; and after improvement, entering a concentration tank, performing further concentration, dehydrating by using a filter press and recycling. A water inlet of the nano iron reaction device is formed in the upper part of a reaction area and is led to a position near a medicating port at the lower part of the reaction area through a downward straight pipe; a vertical partition board is arranged at the connection position of the reaction area and a precipitation area. The recovery process can realize recovery of rare noble metals such as gold, silver, selenium and copper. The nano iron reaction device is improved, so that the waste water and the nano iron can be completely contacted to react and can be separated well.
Description
Technical field
The invention belongs to the technology for treating industrial waste water field, relate to the recovery technology of rare precious metal in a kind of waste water and the nanometer iron reaction unit of wherein using.
Background technology
In the waste water of smelting and electroplating industry generation, contain plurality of heavy metal, wherein contain rare precious metals such as gold and silver, selenium and copper in a lot of waste water.Heavy metal contamination has carcinogenic, teratogenesis, mutagenic significant damage to the mankind, and traditional method only can be removed the heavy metal in the waste water, can't carry out resource recycling to metal values wherein, causes the wasting of resources and secondary pollution.
General heavy metal wastewater thereby complicated component contains contents of many kinds of heavy metal ion, acid content height, saltiness height, and the variation water quality scope is big, causes intractability big, the processing cost height.The present traditional chemical facture that adopts mostly, electric flocculence etc.The traditional chemical facture is mainly and adds lime or NaOH neutralisation, add sulphide precipitation, simple to operate but the severe operational environment of traditional chemical method, the dosing kind is many, go out water management difficulty height, water outlet can not stably reaching standard, and sludge output is big, metal content is low in the mud, impurity is many, and the rare precious metal resource can't reclaim.The electricity flocculence used more in recent years, but the water inlet of electric flocculence is strict, and the water inlet saltiness can not be high, the running maintenance difficulty, and positive plate consumption is big, investment running cost height, and can't effectively realize resource recycling.
The existing rare precious metal trade effluent that contains is only considered qualified discharge, and treatment technology all is that heavy metal is removed from water body, and has produced a large amount of body refuses, to secondary environmental pollution, has ignored the recycling of heavy metal in the waste water.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of recovery technology that not only can administer waste water but also can realize rare precious metal in the waste water that rare precious metals such as wherein gold and silver, selenium and copper reclaim, i.e. the nanometer iron reaction unit that nanometer iron reaction is reclaimed technology and wherein used.
Technical scheme of the present invention is as follows:
The recovery technology of rare precious metal in a kind of waste water, it adopts the reaction of nanometer iron to reclaim technology, and technical process is as follows:
Heavy metal wastewater thereby enters equalizing tank, carries out the adjusting of the water yield and the homogenizing of water quality with this, can move under a metastable water quality and water yield condition to guarantee the subsequent disposal facility.Equalizing tank waste water enters nanometer iron reaction unit after lift pump promotes, fully stir, and fully contacts with nanometer iron, carries out oxidation, reduction, absorption, coprecipitated, with rare precious metal and the effectively reaction of other heavy metals generation in the waste water.Generally 2～3 times by the heavy metal ions in wastewater total content add nanometer iron, sufficient reaction time 20～40 minutes, and continuously stirring.According to dosage and the hybrid reaction time of online ORP evaluation control nanometer iron, control is not influenced by variation water quality fully automatically.Reaction back water outlet enters the coagulating sedimentation integral pool, and add coagulating agent and carry out catalyzed oxidation coupling flocculation reaction, and precipitate and separate.Precipitated outlet water enters strainer, further removes suspended substance and heavy metal ion, enters outlet sump again.The rare precious metal body refuse that contains that Sewage treatment systems produces drains into the body refuse pond, enters the mud concentration tank after promoting, and in the mud concentration tank mud is further concentrated, and the body refuse that contains rare precious metal after concentrating is recycled after the pressure filter dehydration.
The nanometer iron reaction unit of using in the recovery technology of rare precious metal in a kind of above-mentioned waste water, it comprises reaction zone and settling region, reaction zone is provided with frame stirrer; Water-in is located at reaction zone top, and leads near the dosing mouth of reaction zone bottom by a downward straight tube; Reaction zone and junction, settling region are provided with vertical clapboard; Top, settling region is provided with effluent weir and water outlet, and the middle part, settling region is provided with swash plate and is beneficial to the nano iron particles sedimentation, and threeway is established in the sedimentation outlet of bottom, settling region, one tunnel logical slag-drip opening, and the refluxing opening of reaction zone bottom is led on another road.
Principle of the present invention is as follows:
It is a kind of brand-new sewage disposal and resource recovery process that technology is reclaimed in the reaction of nanometer iron, and its pharmacy response is nanometer iron powder, utilizes the reducing power of nanometer iron and very strong chemical mobility of the surface to adsorb various heavy metal ion.This treatment process and series product have good reduction adsorptive power to rare precious metals such as underwater gold, silver, selenium, copper, and reduction, adsorption rate reach 95%-99%.Use particle diameter to be about 10～200 nanometer iron powders, its specific surface area is big, the reaction efficiency height, and required time is shorter, and to belong to ionic reaction fast with underwater gold, and absorption, processing capacity are the hundred times of common material.With respect to traditional technology, technology is reclaimed in the reaction of nanometer iron following characteristics: anti-(water quality, the water yield) impact load ability is strong; Effluent quality is effective and reliable and stable; The body refuse sedimentation function is good, and sludge quantity has only traditional technology 20%, because the mud amount is few, and gold and silver, copper content height in the mud, and all be that ionic forms exists, mud is realized resource regeneration fully.Its reaction mechanism is: absorption+redox+coprecipitated
2Au
3+＋3Fe==2Au＋3Fe
2+；
2Ag
+＋Fe==2Ag＋Fe
2+；
Cu
2+＋Fe==Cu＋Fe
2+。
Beneficial effect of the present invention:
It is a kind ofly can remove environment remediation and the resource utilization new technology that pollution can realize the heavy metal regeneration again that technology is reclaimed in the reaction of nanometer iron among the present invention.Adopt nanometer iron reaction of the present invention to reclaim technology and administer heavy metal wastewater thereby, not only can administer waste water, and can realize the wherein recovery of rare precious metals such as gold and silver, selenium and copper.
Nanometer iron reaction unit among the present invention can make waste water and nanometer iron contact reacts better more fully through improving; Simultaneously, make the reaction zone water outlet enter the settling region from top, the nanometer iron after waste water and the complete reaction is separated better.
Description of drawings
Fig. 1 is the recovery process flow diagram of rare precious metal in the waste water among the present invention;
Fig. 2 is the nanometer iron reaction unit structural representation among the present invention.
Among the figure: 1, reaction zone 2, settling region 3, water-in 4, downward straight tube 5, dosing mouth
6, frame stirrer 7, vertical clapboard 8, effluent weir 9, water outlet 10, swash plate
11, slag-drip opening 12, refluxing opening 13, column
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As shown in Figure 1, the recovery technology of rare precious metal in a kind of waste water of the present invention, it adopts the reaction of nanometer iron to reclaim technology, and technical process is as follows: heavy metal wastewater thereby enters equalizing tank, carries out the adjusting of the water yield and the homogenizing of water quality; Equalizing tank waste water is after lift pump promotes, enter nanometer iron reaction unit, 2～3 times by the heavy metal ions in wastewater total content add nanometer iron, fully stir, make rare precious metal and other heavy metals in nanometer iron and the waste water carry out oxidation, reduction, absorption, coprecipitated reaction, fully reaction is 20～40 minutes, and continuously stirring; According to dosage and the hybrid reaction time of online ORP evaluation control nanometer iron, control is not influenced by variation water quality fully automatically; Reaction back water outlet enters the coagulating sedimentation integral pool, and add PFS and PAM compound coagulant and carry out catalyzed oxidation coupling flocculation reaction, and precipitate and separate; Precipitated outlet water enters strainer, further removes suspended substance and heavy metal ion, enters outlet sump again; The rare precious metal body refuse that contains that Sewage treatment systems produces drains into the body refuse pond, enters the mud concentration tank after promoting, and in the mud concentration tank mud is further concentrated, and the body refuse that contains rare precious metal after concentrating is recycled after the pressure filter dehydration.
As shown in Figure 2, the nanometer iron reaction unit of using in the recovery technology of rare precious metal in a kind of above-mentioned waste water of the present invention, it comprises reaction zone 1 and the settling region 2 that is supported and linked to each other by column 13 respectively, reaction zone is provided with frame stirrer 6; Water-in 3 is located at reaction zone top, and leads to by a downward straight tube 4 near the dosing mouth 5 of reaction zone bottom, can make waste water and nanometer iron contact reacts better more fully like this; Reaction zone and junction, settling region are provided with vertical clapboard 7, so that the reaction zone water outlet enters the settling region from top; Top, settling region is provided with effluent weir 8 and water outlet 9, and the middle part, settling region is provided with swash plate 10 and is beneficial to the nano iron particles precipitation, and threeway is established in the sedimentation outlet of bottom, settling region, one tunnel logical slag-drip opening 11, and the refluxing opening 12 of reaction zone bottom is led on another road.
Certain copper industry rare precious metal smelting shop 750t/d waste water, wherein rare precious metal content is Au:0.5mg/L; Ag:0.5mg/L; Cu:100mg/L.Through the reaction of two-stage nanometer iron medicament, every grade of by the heavy metal ions in wastewater total content 3 times add nanometer iron, and 30 minutes every order reaction time, water outlet is up to standard fully.Handle waste water consumption nanometer iron 300kg every day, produce about 1 ton of dried body refuse, contain Au:350g in the body refuse per ton; Ag:355g; Cu:74kg, rare precious metal taste height in the waste residue returns the smelting production line with body refuse and continues to produce immense value.
Certain smeltery's two workshop 80t/d heavy metal wastewater thereby, wherein heavy metal content is Cu:150mg/L; Au:0.73mg/L; Ag:2.99mg/L.Through the reaction of three grades of nanometer iron medicaments, every grade of by the heavy metal ions in wastewater total content 2 times add nanometer iron, and 20 minutes every order reaction time, water outlet is up to standard fully.Handle waste water consumption nanometer iron 50kg every day, produce about 0.15 ton of body refuse, contain Au:333g in the waste residue per ton; Ag:1540; Cu:77.4kg, waste residue return and smelt production line continuation generation immense value.
The 100t/d heavy metal wastewater thereby certain rare your smeltery's copper anode mud treatment process produces, wherein heavy metal content is Cu:62.74mg/L; Au:0.2mg/L; Ag:0.5mg/L; Se:978.2mg/L.Through the reaction of three grades of nanometer medicaments, every grade of by the heavy metal ions in wastewater total content 2.5 times add nanometer iron, and 40 minutes every order reaction time, water outlet is up to standard fully.Handle waste water consumption nanometer iron 310kg every day, produce about 0.5 ton of body refuse, contain Au:40g in the waste residue per ton; Ag:100g; Cu:125kg; Se:195kg, waste residue return and smelt production line continuation generation immense value.
Claims (4)
1. the recovery technology of rare precious metal in the waste water is characterized in that, its adopts the reaction of nanometer iron to reclaim technology, and technical process is as follows:
Heavy metal wastewater thereby enters equalizing tank, carries out the adjusting of the water yield and the homogenizing of water quality; Equalizing tank waste water is after lift pump promotes, enter nanometer iron reaction unit, 2～3 times by the heavy metal ions in wastewater total content add nanometer iron, fully stir, make rare precious metal and other heavy metals in nanometer iron and the waste water carry out oxidation, reduction, absorption, coprecipitated reaction, fully reaction is 20～40 minutes, and continuously stirring; According to dosage and the hybrid reaction time of online ORP evaluation control nanometer iron; Reaction back water outlet enters the coagulating sedimentation integral pool, and add coagulating agent and carry out catalyzed oxidation coupling flocculation reaction, and precipitate and separate; Precipitated outlet water enters strainer, further removes suspended substance and heavy metal ion, enters outlet sump again; The rare precious metal body refuse that contains that Sewage treatment systems produces drains into the body refuse pond, enters the mud concentration tank and further concentrate after promoting, and the body refuse that contains rare precious metal after concentrating is recycled after the pressure filter dehydration.
2. the recovery technology of rare precious metal in the waste water as claimed in claim 1 is characterized in that, the particle diameter of described nanometer iron is 10～200 nanometers.
3. the recovery technology of rare precious metal in the waste water as claimed in claim 1 or 2 is characterized in that, reaction back water outlet enters the coagulating sedimentation integral pool, add PFS and PAM compound coagulant and carry out catalyzed oxidation coupling flocculation reaction, and precipitate and separate.
4. the nanometer iron reaction unit of using in the recovery technology as rare precious metal in the arbitrary described waste water of claim 1-3, it comprises reaction zone and settling region, reaction zone is provided with frame stirrer; Top, settling region is provided with effluent weir and water outlet, and the middle part, settling region is provided with swash plate, and threeway is established in the sedimentation outlet of bottom, settling region, one tunnel logical slag-drip opening, and the refluxing opening of reaction zone bottom is led on another road; It is characterized in that water-in is located at reaction zone top, and lead near the dosing mouth of reaction zone bottom by a downward straight tube; Reaction zone and junction, settling region are provided with vertical clapboard.
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| CN106007056A (en) * | 2016-06-02 | 2016-10-12 | 哈尔滨工业大学 | Device and method for simultaneous removal of trace heavy metals in electroplating wastewater |
| CN106145447A (en) * | 2016-08-12 | 2016-11-23 | 内蒙古君正氯碱化工技术研究院 | A kind of sewage-treatment plant and the method processing sewage thereof |
| CN108083414A (en) * | 2016-11-21 | 2018-05-29 | 鹏鼎控股(深圳)股份有限公司 | Waste water treatment system and wastewater treatment method |
| CN109133445A (en) * | 2018-10-10 | 2019-01-04 | 吉林大学 | A kind of integrated reacting system for nanometer micro-electrolysis material |
| CN111470671A (en) * | 2020-04-16 | 2020-07-31 | 山东省科学院激光研究所 | Method for treating arsenic-containing organic wastewater |
| CN112057912A (en) * | 2020-09-18 | 2020-12-11 | 金驰能源材料有限公司 | Double-row pipe vortex settling device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109133445A (en) * | 2018-10-10 | 2019-01-04 | 吉林大学 | A kind of integrated reacting system for nanometer micro-electrolysis material |
| CN111470671A (en) * | 2020-04-16 | 2020-07-31 | 山东省科学院激光研究所 | Method for treating arsenic-containing organic wastewater |
| CN111470671B (en) * | 2020-04-16 | 2022-05-13 | 山东省科学院激光研究所 | Method for treating arsenic-containing organic wastewater |
| CN112057912A (en) * | 2020-09-18 | 2020-12-11 | 金驰能源材料有限公司 | Double-row pipe vortex settling device |
| CN112057912B (en) * | 2020-09-18 | 2021-06-29 | 金驰能源材料有限公司 | Double-row pipe vortex settling device |
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