CN103342423B - 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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- CN103342423B CN103342423B CN201310294829.2A CN201310294829A CN103342423B CN 103342423 B CN103342423 B CN 103342423B CN 201310294829 A CN201310294829 A CN 201310294829A CN 103342423 B CN103342423 B CN 103342423B
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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
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- 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 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 industrial waste water treatment, the recovery process relating to rare precious metal in a kind of waste water and the Nanoscale Iron reaction unit wherein used.
Background technology
Containing plurality of heavy metal in the waste water that smelting and electroplating industry produce, wherein contain the 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 remove the heavy metal in waste water, cannot carry out resource recycling, cause the wasting of resources and secondary pollution to wherein metal values.
General heavy metal wastewater thereby complicated component, containing contents of many kinds of heavy metal ion, acid content is high, saltiness is high, and variation water quality scope is large, and cause intractability large, processing cost is high.The traditional chemical facture, electric flocculence etc. that mostly adopt at present.Traditional chemical facture is mainly and adds lime or NaOH neutralisation, add sulphide precipitation, simple to operate but the severe operational environment of conventional chemical methods, dosing kind is many, go out water management difficulty high, water outlet can not stably reaching standard, and sludge output is large, in mud, metal content is low, impurity is many, and rare precious metal resource cannot reclaim.Electricity flocculence used more in recent years, but electric flocculence inflow requirement is strict, and water inlet saltiness can not be high, running maintenance difficulty, and positive plate consumption is large, and investment running cost is high, and effectively cannot realize resource recycling.
The existing rare precious metal trade effluent that contains only considers qualified discharge, and treatment technology is all removed from water body by heavy metal, and creates a large amount of body refuses, to secondary environmental pollution, have ignored the recycling of heavy metal in waste water.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, there is provided the recovery process of rare precious metal in a kind of waste water not only can administered waste water but also can realize the precious and rare metals recoveries such as wherein gold and silver, selenium and copper, i.e. Nanoscale Iron reaction recovery process and the Nanoscale Iron reaction unit wherein used.
Technical scheme of the present invention is as follows:
A recovery process for rare precious metal in waste water, it adopts Nanoscale Iron reaction recovery process, and technical process is as follows:
Heavy metal wastewater thereby enters equalizing tank, carries out the adjustment of the water yield and the homogenizing of water quality with this, to ensure that subsequent disposal facility can run under a metastable water quality and water yield condition.Equalizing tank waste water, after lift pump promotes, enters Nanoscale Iron reaction unit, fully stirs, fully contact with Nanoscale Iron, carries out being oxidized, reduces, adsorbs, coprecipitated, produces effectively react with the rare precious metal in waste water and other heavy metals.Generally add Nanoscale Iron by 2 ~ 3 times of heavy metal ions in wastewater total content, sufficient reaction time 20 ~ 40 minutes, and continuously stirring.Control dosage and the hybrid reaction time of Nanoscale Iron according to online ORP evaluation, complete full automatic control, does not affect by variation water quality.After reaction, water outlet enters coagulating sedimentation integral pool, adds coagulating agent and carries out catalyzed oxidation coupling flocculation reaction, and precipitate and separate.Precipitation water outlet enters strainer, removes suspended substance and heavy metal ion further, then enters outlet sump.What Sewage treatment systems produced drains into body refuse pond containing rare precious metal body refuse, enters sludge concentrating pot, further concentrate in sludge concentrating pot to mud after promoting, and the body refuse containing rare precious metal after concentrated is recycled after pressure filter dehydration.
In above-mentioned waste water rare precious metal recovery process in the Nanoscale Iron reaction unit used, it comprises reaction zone and settling region, and reaction zone is provided with frame stirrer; Water-in is located at top, reaction zone, and leads near the dosing mouth of bottom, reaction zone 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, is provided with swash plate and is beneficial to nano iron particles sedimentation in the middle part of settling region, and bottom settling region, sedimentation outlet establishes threeway, a-road-through slag-drip opening, and the refluxing opening bottom reaction zone is led on another road.
Principle of the present invention is as follows:
Nanoscale Iron reaction recovery process is a kind of brand-new sewage disposal and resource recovery process, and its pharmacy response is nanometer iron powder, utilizes the reducing power of Nanoscale Iron and very strong chemical mobility of the surface to adsorb various heavy metal ion.This treatment process and series product have good reduction adsorption ability 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 large, and reaction efficiency is high, and required time is shorter, and to belong to ionic reaction fast with underwater gold, and absorption, process capacity are the hundred times of common material.Relative to traditional technology, Nanoscale Iron reaction recovery process has following features: anti-(water quality, the water yield) impact load ability is strong; Effluent quality is effective and reliable and stable; Body refuse sedimentation function is good, and sludge quantity only has traditional technology 20%, and because mud amount is few, gold and silver in mud, copper content are high, and is all that ionic forms exists, and mud realizes resource regeneration completely.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:
Nanoscale Iron reaction recovery process in the present invention a kind ofly can remove environment remediation and the resource utilization new technology that pollution can realize again heavy metal regeneration.Adopt Nanoscale Iron of the present invention to react recovery process and administer heavy metal wastewater thereby, not only can administer waste water, and the recovery of the rare precious metals such as wherein gold and silver, selenium and copper can be realized.
Nanoscale Iron reaction unit in the present invention, through improving, can make waste water and the better contact reacts more fully of Nanoscale Iron; Meanwhile, make reaction zone water outlet enter settling region from top, waste water is separated better with the Nanoscale Iron after complete reaction.
Accompanying drawing explanation
Fig. 1 is the recovery process schematic flow sheet of rare precious metal in the waste water in the present invention;
Fig. 2 is the Nanoscale Iron reaction unit structural representation in the present invention.
In 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
Below in conjunction with drawings and Examples, the present invention is further illustrated.
As shown in Figure 1, the recovery process of rare precious metal in a kind of waste water of the present invention, it adopts Nanoscale Iron reaction recovery process, and technical process is as follows: heavy metal wastewater thereby enters equalizing tank, carries out the adjustment of the water yield and the homogenizing of water quality; Equalizing tank waste water is after lift pump promotes, enter Nanoscale Iron reaction unit, Nanoscale Iron is added by 2 ~ 3 times of heavy metal ions in wastewater total content, abundant stirring, make the rare precious metal in Nanoscale Iron and waste water and other heavy metals carry out being oxidized, reduce, adsorb, coprecipitated reaction, abundant reaction 20 ~ 40 minutes, and continuously stirring; Control dosage and the hybrid reaction time of Nanoscale Iron according to online ORP evaluation, complete full automatic control, does not affect by variation water quality; After reaction, water outlet enters coagulating sedimentation integral pool, adds PFS and PAM compound coagulant and carries out catalyzed oxidation coupling flocculation reaction, and precipitate and separate; Precipitation water outlet enters strainer, removes suspended substance and heavy metal ion further, then enters outlet sump; What Sewage treatment systems produced drains into body refuse pond containing rare precious metal body refuse, enters sludge concentrating pot, further concentrate in sludge concentrating pot to mud after promoting, and the body refuse containing rare precious metal after concentrated is recycled after pressure filter dehydration.
As shown in Figure 2, in a kind of above-mentioned waste water of the present invention rare precious metal recovery process in the Nanoscale Iron reaction unit used, it comprises and being supported by column 13 respectively and the reaction zone 1 be connected and settling region 2, and reaction zone is provided with frame stirrer 6; Water-in 3 is located at top, reaction zone, and leads near the dosing mouth 5 of bottom, reaction zone by a downward straight tube 4, can make waste water and the better contact reacts more fully of Nanoscale Iron like this; Reaction zone and junction, settling region are provided with vertical clapboard 7, enter settling region to make reaction zone water outlet from top; Top, settling region is provided with effluent weir 8 and water outlet 9, is provided with swash plate 10 and is beneficial to nano iron particles precipitation in the middle part of settling region, and bottom settling region, sedimentation outlet establishes threeway, a-road-through slag-drip opening 11, and the refluxing opening 12 bottom reaction zone is led on another road.
Embodiment 1
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 Nanoscale Iron medicament, every grade adds Nanoscale Iron by 3 times of heavy metal ions in wastewater total content, and 30 minutes every order reaction time, water outlet is completely up to standard.Process waste water consumption Nanoscale Iron 300kg every day, produce dry body refuse about 1 ton, containing Au:350g in body refuse per ton; Ag:355g; Cu:74kg, in waste residue, rare precious metal taste is high, is returned by body refuse and smelts production line continuation generation immense value.
Embodiment 2
Certain workshop, smeltery two 80t/d heavy metal wastewater thereby, wherein heavy metal content is Cu:150mg/L; Au:0.73mg/L; Ag:2.99mg/L.Through three grades of Nanoscale Iron medicament reactions, every grade adds Nanoscale Iron by 2 times of heavy metal ions in wastewater total content, and 20 minutes every order reaction time, water outlet is completely up to standard.Process waste water consumption Nanoscale Iron 50kg every day, produce body refuse about 0.15 ton, containing Au:333g in waste residue per ton; Ag:1540; Cu:77.4kg, waste residue returns smelts production line continuation generation immense value.
Embodiment 3
The 100t/d heavy metal wastewater thereby certain your Smelter Copper anode slime treatment process rare produces, wherein heavy metal content is Cu:62.74mg/L; Au:0.2mg/L; Ag:0.5mg/L; Se:978.2mg/L.Through three grades of nanometer medicament reactions, every grade adds Nanoscale Iron by 2.5 times of heavy metal ions in wastewater total content, and 40 minutes every order reaction time, water outlet is completely up to standard.Process waste water consumption Nanoscale Iron 310kg every day, produce body refuse about 0.5 ton, containing Au:40g in waste residue per ton; Ag:100g; Cu:125kg; Se:195kg, waste residue returns smelts production line continuation generation immense value.
Claims (2)
1. the recovery process of rare precious metal in waste water, is characterized in that, its adopts Nanoscale Iron reaction recovery process, and technical process is as follows:
Heavy metal wastewater thereby enters equalizing tank, carries out the adjustment of the water yield and the homogenizing of water quality; Equalizing tank waste water is after lift pump promotes, enter Nanoscale Iron reaction unit, Nanoscale Iron is added by 2 ~ 3 times of heavy metal ions in wastewater total content, abundant stirring, make the rare precious metal in Nanoscale Iron and waste water and other heavy metals carry out being oxidized, reduce, adsorb, coprecipitated reaction, abundant reaction 20 ~ 40 minutes, and continuously stirring; Dosage and the hybrid reaction time of Nanoscale Iron is controlled according to online ORP evaluation; After reaction, water outlet enters coagulating sedimentation integral pool, adds coagulating agent and carries out catalyzed oxidation coupling flocculation reaction, and precipitate and separate; Precipitation water outlet enters strainer, removes suspended substance and heavy metal ion further, then enters outlet sump; What Sewage treatment systems produced drains into body refuse pond containing rare precious metal body refuse, enters sludge concentrating pot and concentrate further after promoting, and the body refuse containing rare precious metal after concentrated is recycled after pressure filter dehydration;
Described rare precious metal is gold and silver, selenium or copper;
The particle diameter of described Nanoscale Iron is 10 ~ 200 nanometers;
In described waste water rare precious metal recovery process in the Nanoscale Iron reaction unit used, it comprises reaction zone and settling region, and reaction zone is provided with frame stirrer; Top, settling region is provided with effluent weir and water outlet, is provided with swash plate in the middle part of settling region, and bottom settling region, sedimentation outlet establishes threeway, a-road-through slag-drip opening, and the refluxing opening bottom reaction zone is led on another road; It is characterized in that, water-in is located at top, reaction zone, and leads near the dosing mouth of bottom, reaction zone by a downward straight tube; Reaction zone and junction, settling region are provided with vertical clapboard.
2. the recovery process of rare precious metal in waste water as claimed in claim 1, it is characterized in that, after reaction, water outlet enters coagulating sedimentation integral pool, adds PFS and PAM compound coagulant and carries out catalyzed oxidation coupling flocculation reaction, and precipitate and separate.
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| CN106007056B (en) * | 2016-06-02 | 2019-06-04 | 哈尔滨工业大学 | A kind of synchronous device and method for removing micro heavy 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 |
| 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 |
| 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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| CN101088938B (en) * | 2007-06-29 | 2012-06-27 | 东莞东运机械制造有限公司 | Process of treating heavy metal containing sewage |
| CN101148297A (en) * | 2007-08-29 | 2008-03-26 | 浙江大学 | Method for processing surface treatment integrated waste water |
| CN101811793B (en) * | 2009-02-24 | 2011-12-21 | 宝山钢铁股份有限公司 | Pretreatment process of chromium-containing wastewater |
| CN102583689A (en) * | 2012-02-22 | 2012-07-18 | 同济大学 | Method and device for removing heavy metal in electroplating wastewater through nanoscale zero-valent iron-electromagnetic system |
| CN102897889B (en) * | 2012-10-29 | 2014-04-16 | 同济大学 | Method and device for purifying cadmium in waste water through nano zero-valent iron |
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