CN101037285A - Integrative recovering and reusing of heavy metals in wire board plating wastewater treatment sludge - Google Patents
Integrative recovering and reusing of heavy metals in wire board plating wastewater treatment sludge Download PDFInfo
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- CN101037285A CN101037285A CNA200710019758XA CN200710019758A CN101037285A CN 101037285 A CN101037285 A CN 101037285A CN A200710019758X A CNA200710019758X A CN A200710019758XA CN 200710019758 A CN200710019758 A CN 200710019758A CN 101037285 A CN101037285 A CN 101037285A
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- gold
- copper
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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
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention relates to a method of recovering gold and copper heavy metal from the sludge generated from plating waste water by dealing with circuit board and of producing waste water treating-agent. The method is provided with steps of: absorbing the gold in solution by active carbon; deoxidizing gold by zineum; substituting the scrap iron by the copper in filtrate; further treating the residual irons solution to get a good waste water treating-agent. The pureness of the achieved gold and copper is above 98%. The waste water treating-agent is used for treating printing and dyeing waste water and has an obvious decolorizing effects and a high COD removal rate. The invention invests few, takes effects quickly, wins more, handles simply, is with a percent products recovery and a good quality.
Description
Technical field
The present invention relates to the comprehensive reutilization method of heavy metal in the industrial sludge, particularly the method that from the mud that processing circuitry plate electroplating wastewater is produced, reclaims gold, copper heavy metal and prepare waste water conditioner.
Background technology
Comprehensive utilization is to realize one of most important means of reclamation of solid wastes, minimizing.The Chinese government always payes attention to the solid waste comprehensive utilization, has data to show, the present percentage of industrial solid waste that is comprehensively utilized of China reaches 78.67%.But, the state of the art from comprehensive utilization, mostly rest on and act as a fuel, build the road, on the lower level such as backfill, production building materials, lack the product of added value, deep processing, and various lots of comprehensive utilization of waste materials problem obtain basic solution.
In recent years, flourish along with electron trade, wiring board (printing electronic circuit, PCB) a large amount of appearance.Yet in the wiring board electroplating process, can produce waste water, contain a large amount of cupric ions in these waste water, the existence that gold is arranged in the waste water of gold-plated line is arranged.Also to adopt iron coagulating agent (iron trichloride) that these waste water are handled in order to reach emission standard, contain a large amount of cupric ions, iron ion and gold in the mud that is produced after therefore handling.By analysis, the copper content of these mud is 10～30%, and iron level is 25～30%, and gold content is at 10～200mg/kg.At will do not stack or direct landfill if these mud are treated, can cause secondary pollution underground water, ecotope, more can be along the path migration of mud → soil → farm crop → human body.Understand according to the applicant, some enterprise also can reclaim copper and was used from mud in the past, reclaimed copper and generally adopted wet method or dry method, and the principle of wet method is to dissolve copper in the mud with acid, and then copper is extracted; The principle of dry method is to adopt the heating smelting process to extract copper, but the higher metal of other content is not well reclaimed and utilizes.Therefore,, reclaim wherein copper, Jin Hetie, not only can avoid environmental pollution, realize cleaner production, but also can obtain tangible ecology and economic benefit if with the secondary renewable resources of this mud as a kind of cheapness.How the present invention fully utilizes with regard to the mud that produces in the processing circuitry plate electroplating wastewater is launched to discuss.
Summary of the invention
The invention provides the comprehensive reutilization method of heavy metal in a kind of wire board plating wastewater treatment sludge, its objective is the comprehensive reutilization problem that will solve copper, gold, iron in the existing lining plate electroplating sludge by chemical process, thereby avoid environmental pollution, save heavy metal resources.
For achieving the above object, the technical solution used in the present invention is: the comprehensive reutilization method of heavy metal in a kind of wire board plating wastewater treatment sludge, and the mud that produces with processing circuitry plate electroplating wastewater is raw material, comprises following steps successively:
(1), reclaims gold
1., Jin dissolving
In mud, add chloroazotic acid and heating, gold, copper, iron in the mud are fully dissolved; Filter and wash with water, the sludge settling thing discards, and gold-containing solution keeps stand-by; Gold is as follows with the chloroazotic acid reaction equation:
Au+4HCl+HNO
3＝HAuCl
4+NO+2H
2O
2., charcoal absorption gold
In gold-containing solution, add gac and fully stirring, make the abundant ADSORPTION OF GOLD of gac; Filtering separation, the gac throw out washs with dilute hydrochloric acid, removes cupric ion and iron ion; Wash with water again to neutrality; Filtrate being used to reclaimed copper;
3., Jin dissolving once more
With the ashing of gac throw out high temperature sintering; Calcination thing aqua regia dissolution; Filter and wash with water, remove insoluble impurity; Gold filtrate keeps stand-by;
4., Jin reduction
In golden filtrate, add zinc, fully stir and carry out reduction reaction generation bronze throw out; Filter and wash with water, obtain the bronze throw out, filtrate is as producing compound coagulant; The reduction reaction equation of gold is as follows:
2HAuCl
4+4Zn＝4ZnCl
2+2Au+H
2↑
(2), reclaim copper
1., the reduction of copper
Directly drop into iron filings in the filtrate after the charcoal absorption gold separates and carry out reduction reaction, obtain the copper throw out; The reduction reaction equation of copper is as follows:
Cu
2++Fe＝Cu+Fe
2+
2., the separation of copper and purification
Reaction soln is filtered, and throw out is removed unnecessary iron in the precipitation with the dilute hydrochloric acid washing of heat, washes with water to neutrality again, obtains pure copper powder; Filtrate is as producing compound coagulant;
(3), preparation compound coagulant
1., add iron filings in the filtrate after reclaiming copper, continue reaction and making its acidity drop to pH=2～3, the filtering reaction thing is removed unnecessary iron filings;
2., add hydrogen peroxide in the filtrate and carry out oxidizing reaction, add-on makes Fe in the solution
3+, Fe
2+Content respectively account for half, finally obtain a kind of Fe of containing
3+, Fe
2+, Zn
2+Compound coagulant.
Related content in the technique scheme is explained as follows:
1, in the such scheme, described raw material " mud " is to produce mud behind the processing circuitry plate electroplating wastewater.Before reclaiming gold, can carry out drying, pulverize pre-treatment mud.For pressing filterable wet mud, can dry or dry on the industrial production, then crushing; Also can dry, pulverize.
2, in the such scheme, in the dissolving step of gold, used chloroazotic acid is meant 1: 3 by volume liquid mixture prepared of concentrated nitric acid and concentrated hydrochloric acid.In this step, chloroazotic acid also can replace with waste nitric acid copper and 1: 3 by volume liquid mixture prepared of concentrated hydrochloric acid.
3, in the such scheme, in charcoal absorption gold step, in order to improve adsorption effect, the gac of adding is Powdered, add-on is a gac and the weight ratio of gold is 1: 0.8～1.2, adds to adopt behind the gac mode of stirring-quiet stopping-stir to make the abundant ADSORPTION OF GOLD of gac.
4, in the such scheme, in the reduction step of gold, in order to improve the purity of bronze, the zinc of adding is zinc powder, and zinc powder is removed the oxide skin on zinc powder surface in advance through 20% acetic acid carrying out washing treatment.
5, in the such scheme, after the reduction step of gold, can then carry out the purification of gold:
A, dezincify
The bronze throw out that reduction reaction is obtained washs with hot dilute hydrochloric acid, removes unnecessary zinc; The washing after-filtration separates, and the bronze throw out washes with water to neutrality again, and filtrate being used to produced compound coagulant;
B, remove copper
The rare nitric acid of bronze throw out behind the dezincify with heat is continued to wash, remove unnecessary copper; The washing after-filtration separates, and the bronze throw out washes with water to neutrality again, obtains the proof gold powder, and filtrate being used to reclaimed copper;
C, gold metallurgy piece
The proof gold powder is placed 1200 ℃ retort furnace calcination, obtain content at the mint fine bars more than 99.8%.
6, in the such scheme, in the reduction step of copper,, can in advance the iron filings that drop into be carried out carrying out washing treatment with dilute hydrochloric acid, remove the oxide skin on iron filings surface in order to obtain the copper powder of higher degree.
Because the technique scheme utilization, the present invention compared with prior art has following advantage and effect:
1, the present invention is directed to the wire board plating wastewater that contains gold, copper, iron and handle the mud that produces, gold be will reclaim, copper and preparation compound coagulant technology organic assembling reclaimed, a kind of method of comprehensive reutilization is provided, and this technical scheme compared with prior art has outstanding substantive distinguishing features and significant technical progress.This method not only has significant directive significance to realizing the management of electronics recycling sludge and recycling, and for the Sustainable development that realizes economic society great realistic significance is arranged.
2, the present invention is on actual industrial production, advantage such as have less investment, instant effect, income is big, simple to operate, product recovery rate is high, quality is good, not only have good environmental benefit and social benefit, and have tangible economic benefit, its popularizing application prospect is wide.
Description of drawings
Accompanying drawing 1 is the recovery process flow sheet of embodiment of the invention gold;
Accompanying drawing 2 is the recovery process flow sheet of embodiment of the invention copper;
Accompanying drawing 3 prepares the compound coagulant schema for the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described:
Embodiment: the comprehensive reutilization method of heavy metal in a kind of wire board plating wastewater treatment sludge, the mud that produces with processing circuitry plate electroplating wastewater is raw material, comprises following steps successively:
(1), reclaims gold
Gold is the human knowledge and uses one of metal the earliest, also is human wealth symbol of trying hard to gain for thousands of years.Along with the reduction of gold currency function and weakening of decoration functions, the industrial use of gold has become one of main function of gold.Contain gold in the electronics mud, through experimental analysis, its content is at 10～200mg/kg, just can recycle when above when content reaches 50mg/kg.Along with industrial expansion, the demand of gold has made full use of precious metal " secondary mineral products " resource in these mud also in continuous growth, for the strategy of sustainable development that realizes China very important meaning is arranged.
1., mud pre-treatment
Mud is carried out drying, pulverization process.For pressing filterable wet mud, can dry or dry on the industrial production, then crushing; Also can dry, pulverize.
2., Jin dissolving
In handling mud well, add chloroazotic acid and be heated to little boiling, kept 10 minutes, gold, copper, iron in the mud are fully dissolved; Cooling back press filtration also washes with water, and the sludge settling thing discards, and gold-containing solution keeps stand-by.Gold is as follows with the chloroazotic acid reaction equation:
Au+4HCl+HNO
3＝HAuCl
4+NO+2H
2O
Described chloroazotic acid is concentrated nitric acid and 1: 3 by volume liquid mixture prepared of concentrated hydrochloric acid.But in this step, chloroazotic acid also can replace with waste nitric acid copper and 1: 3 by volume liquid mixture prepared of concentrated hydrochloric acid.The benefit of doing like this is exactly both to have recycled waste nitric acid copper, increased the copper content in the solution again, and the copper solutions of high density will obtain the copper of high yield after treatment.
3., charcoal absorption gold
Content height according to gold adds pulverous gac, thereby reaches comprehensive adsorption rate in gold-containing solution, add-on is that the weight ratio of gac and gold is 1: 1, stirs 2min then, the quiet 10min that stops, and restir 2min makes the abundant ADSORPTION OF GOLD of gac.Then filtering separation, gac throw out be with 5% dilute hydrochloric acid washing, remove cupric ion and iron ion (because of the main ADSORPTION OF GOLD of gac, but copper, iron also have on a small quantity be adsorbed), wash with water to neutrality again.Filtrate being used to reclaimed copper.
4., Jin dissolving once more
With the gac throw out with 600 ℃ of high temperature sintering ashing, calcination thing aqua regia dissolution.Filter then and wash with water, remove insoluble impurity.Gold filtrate keeps stand-by.
5., Jin reduction
In golden filtrate, add zinc powder (zinc powder through 20% acetic acid carrying out washing treatment 2 hours, is removed the oxide skin on zinc powder surface in advance), stirred once, place more than one day, carry out reduction reaction and generate the bronze throw out every one hour.Filter then and wash with water, obtain the bronze throw out, filtrate is as producing compound coagulant.The reduction reaction equation of gold is as follows:
2HAuCl
4+4Zn＝4ZnCl
2+2Au+H
2↑
6., Jin purification:
A, dezincify
The bronze throw out that reduction reaction is obtained washs with 20% hot dilute hydrochloric acid, removes unnecessary zinc.The washing after-filtration separates, and the bronze throw out washes with water to neutrality again, if be not washed till neutrality, when washing with rare nitric acid more below, may can dissolve a small amount of gold because of itself and hydrochloric acid reaction.Filtrate being used to produced compound coagulant.
B, remove copper
The rare nitric acid (volume ratio of concentrated nitric acid and water be 1: 1) of bronze throw out behind the dezincify with heat is continued to wash, remove unnecessary copper.The washing after-filtration separates, and the bronze throw out washes with water to neutrality again, obtains the proof gold powder, and filtrate being used to reclaimed copper.
7., gold metallurgy piece
The proof gold powder is placed 1200 ℃ retort furnace calcination, obtain content at the mint fine bars more than 99.8%.
(2), reclaim copper
1., the reduction of copper
Contain a large amount of cupric ions in the filtrate after charcoal absorption gold separates, and about this moment pH=0.6, just go back native copper.At this moment, directly drop into iron filings (powdery or strip) and carry out reduction reaction in this filtrate, reacted 12 hours, iron becomes iron protochloride, and copper all cements out and generates the copper throw out.The reduction reaction equation of copper is as follows:
Cu
2++Fe＝Cu+Fe
2+
In this step, in order to obtain the copper powder of higher degree, can be in advance the iron filings that drop into be carried out carrying out washing treatment 2 hours, the oxide skin on removal iron filings surface with 20% dilute hydrochloric acid.
2., the separation of copper and purification
Reaction soln is filtered, and throw out is removed unnecessary iron in the precipitation with the 20% dilute hydrochloric acid washing of heat, washes with water to neutrality again, obtains pure copper powder, and its content is about 98～99%.Filtrate is as producing compound coagulant.
(3), preparation compound coagulant (recovery of iron)
1., the filtrate acidity that reclaims behind the copper is still very strong, add iron filings after, continue reaction its acidity descended, pH=2～3, at this moment iron level has also increased in the solution, the filtering reaction thing is removed unnecessary iron filings.At this moment, FeCl in the filtrate
3Content 20% ± 2.
2., in this filtrate, add hydrogen peroxide and carry out oxidizing reaction, add-on makes Fe in the solution
3+, Fe
2+Content respectively account for half, finally obtain a kind of Fe of containing
3+, Fe
2+, Zn
2+Compound coagulant.
This compound coagulant (waste water conditioner) can be used for treatment of dyeing and printing, and its mechanism is: Fe
2+Be used for decolouring, Fe
3+, Zn
2+Be used for coagulation.Therefore, this coagulating agent not only can decolour, and can also reduce the COD value.The solution of post precipitation is limpid, can not occur the phenomenon of dulling jaundice after the placement.
Lab scale with this coagulating agent treatment of dyeing and printing is as follows:
After adding 0.2% self-control coagulating agent in the former water, transfer about pH=8.50, add 1 PAM again, get the supernatant liquor analysis behind the coagulating sedimentation with NaOH.Contrast is as follows before and after its result:
Former water COD=734mg/L, 70 times of colourities, muddy redly.
Handle back COD=230mg/L, its COD clearance is 69%, and solution is clear, 10 times of colourities.
The foregoing description only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (8)
1, the comprehensive reutilization method of heavy metal in a kind of wire board plating wastewater treatment sludge is characterized in that: the mud that produces with processing circuitry plate electroplating wastewater is raw material, comprises following steps successively:
(1), reclaims gold
1., Jin dissolving
In mud, add chloroazotic acid and heating, gold, copper, iron in the mud are fully dissolved; Filter and wash with water, the sludge settling thing discards, and gold-containing solution keeps stand-by;
2., charcoal absorption gold
In gold-containing solution, add gac and fully stirring, make the abundant ADSORPTION OF GOLD of gac; Filtering separation, the gac throw out washs with dilute hydrochloric acid, removes cupric ion and iron ion; Wash with water again to neutrality; Filtrate being used to reclaimed copper;
3., Jin dissolving once more
With the ashing of gac throw out high temperature sintering; Calcination thing aqua regia dissolution; Filter and wash with water, remove insoluble impurity; Gold filtrate keeps stand-by;
4., Jin reduction
In golden filtrate, add zinc, fully stir and carry out reduction reaction generation bronze throw out; Filter and wash with water, obtain the bronze throw out, filtrate is as producing compound coagulant;
(2), reclaim copper
1., the reduction of copper
Directly drop into iron filings in the filtrate after the charcoal absorption gold separates and carry out reduction reaction, obtain the copper throw out;
2., the separation of copper and purification
Reaction soln is filtered, and throw out is removed unnecessary iron in the precipitation with the dilute hydrochloric acid washing of heat, washes with water to neutrality again, obtains pure copper powder; Filtrate is as producing compound coagulant;
(3), preparation compound coagulant
1., add iron filings in the filtrate after reclaiming copper, continue reaction and making its acidity drop to pH=2～3, the filtering reaction thing is removed unnecessary iron filings;
2., add hydrogen peroxide in the filtrate and carry out oxidizing reaction, add-on makes Fe in the solution
3+, Fe
2+Content respectively account for half, finally obtain a kind of Fe of containing
3+, Fe
2+, Zn
2+Compound coagulant.
2, comprehensive reutilization method according to claim 1 is characterized in that: before reclaiming gold mud is carried out drying, pulverizes pre-treatment.
3, comprehensive reutilization method according to claim 1 is characterized in that: in the dissolving step of gold, used chloroazotic acid replaces with waste nitric acid copper and 1: 3 by volume liquid mixture prepared of concentrated hydrochloric acid.
4, comprehensive reutilization method according to claim 1, it is characterized in that: in charcoal absorption gold step, the gac that adds is Powdered, add-on is a gac and the weight ratio of gold is 1: 0.8～1.2, adds to adopt behind the gac mode of stirring-quiet stopping-stir to make the abundant ADSORPTION OF GOLD of gac.
5, comprehensive reutilization method according to claim 1 is characterized in that: in the reduction step of gold, the zinc of adding is zinc powder, and zinc powder is removed the oxide skin on zinc powder surface in advance through 20% acetic acid carrying out washing treatment.
6, comprehensive reutilization method according to claim 1 is characterized in that: after the reduction step of gold, then carry out the purification of gold:
A, dezincify
The bronze throw out that reduction reaction is obtained washs with hot dilute hydrochloric acid, removes unnecessary zinc; The washing after-filtration separates, and the bronze throw out washes with water to neutrality again, and filtrate being used to produced compound coagulant;
B, remove copper
The rare nitric acid of bronze throw out behind the dezincify with heat is continued to wash, remove unnecessary copper; The washing after-filtration separates, and the bronze throw out washes with water to neutrality again, obtains the proof gold powder, and filtrate being used to reclaimed copper.
7, comprehensive reutilization method according to claim 6 is characterized in that: the proof gold powder is placed 1200 ℃ retort furnace calcination, obtain content at the mint fine bars more than 99.8%.
8, comprehensive reutilization method according to claim 1 is characterized in that: in the reduction step of copper, in advance the iron filings that drop into are carried out carrying out washing treatment with dilute hydrochloric acid, remove the oxide skin on iron filings surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710019758XA CN100500600C (en) | 2007-02-09 | 2007-02-09 | Integrative recovering and reusing method for heavy metals in wire board plating wastewater treatment sludge |
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|---|---|---|---|
| CNB200710019758XA CN100500600C (en) | 2007-02-09 | 2007-02-09 | Integrative recovering and reusing method for heavy metals in wire board plating wastewater treatment sludge |
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| Publication Number | Publication Date |
|---|---|
| CN101037285A true CN101037285A (en) | 2007-09-19 |
| CN100500600C CN100500600C (en) | 2009-06-17 |
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|---|---|---|---|
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102061383A (en) * | 2010-11-10 | 2011-05-18 | 紫金矿业集团股份有限公司 | Selective copper removing method for high-copper gold loaded carbon |
| CN102071323A (en) * | 2010-12-16 | 2011-05-25 | 惠州市奥美特环境科技有限公司 | Method for producing high-purity gold by utilizing electroplating waste liquid containing gold |
| CN102618724A (en) * | 2012-04-26 | 2012-08-01 | 大恩(天津)环境技术研发有限公司 | Method for separating and recovering heavy metals from melted garbage burning fly ash |
| CN102887536A (en) * | 2012-10-12 | 2013-01-23 | 金川集团股份有限公司 | Method for comprehensively utilizing high-acid low-copper solution |
| CN103194614A (en) * | 2013-03-22 | 2013-07-10 | 紫金矿业集团股份有限公司 | Low-grade copper-bearing gold ore dump leaching-carbon adsorption production method |
| CN103397190A (en) * | 2013-07-29 | 2013-11-20 | 紫金矿业集团股份有限公司 | Method for producing high-purity gold and copper sulphate from gold-bearing copper sludge |
| CN104404265A (en) * | 2014-12-02 | 2015-03-11 | 中条山有色金属集团有限公司 | Gold powder washing purification method |
| 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 |
| CN108251647A (en) * | 2017-12-14 | 2018-07-06 | 孙光潮 | The method that the copper-contained sludge obtained by flocculent precipitation Treatment of Copper waste water does copper sponge |
| CN108300870A (en) * | 2017-12-14 | 2018-07-20 | 孙光潮 | The method that copper-contained sludge does copper sponge obtained by flocculent precipitation Treatment of Copper waste water |
| CN112662898A (en) * | 2020-12-02 | 2021-04-16 | 昆明理工大学 | Method for efficiently extracting germanium from zinc-germanium leaching solution |
| CN113388739A (en) * | 2021-06-17 | 2021-09-14 | 福州大学 | Method for recovering precious metals in gold plating wastewater by using natural materials |
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2007
- 2007-02-09 CN CNB200710019758XA patent/CN100500600C/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102061383A (en) * | 2010-11-10 | 2011-05-18 | 紫金矿业集团股份有限公司 | Selective copper removing method for high-copper gold loaded carbon |
| CN102071323A (en) * | 2010-12-16 | 2011-05-25 | 惠州市奥美特环境科技有限公司 | Method for producing high-purity gold by utilizing electroplating waste liquid containing gold |
| CN102618724A (en) * | 2012-04-26 | 2012-08-01 | 大恩(天津)环境技术研发有限公司 | Method for separating and recovering heavy metals from melted garbage burning fly ash |
| CN102618724B (en) * | 2012-04-26 | 2013-12-18 | 大恩(天津)环境技术研发有限公司 | Method for separating and recovering heavy metals from melted garbage burning fly ash |
| CN102887536A (en) * | 2012-10-12 | 2013-01-23 | 金川集团股份有限公司 | Method for comprehensively utilizing high-acid low-copper solution |
| CN102887536B (en) * | 2012-10-12 | 2014-06-25 | 金川集团股份有限公司 | Method for comprehensively utilizing high-acid low-copper solution |
| CN103194614B (en) * | 2013-03-22 | 2015-10-21 | 紫金矿业集团股份有限公司 | The method that a kind of low-grade copper gold dump leaching-charcoal absorption is produced |
| CN103194614A (en) * | 2013-03-22 | 2013-07-10 | 紫金矿业集团股份有限公司 | Low-grade copper-bearing gold ore dump leaching-carbon adsorption production method |
| CN103397190A (en) * | 2013-07-29 | 2013-11-20 | 紫金矿业集团股份有限公司 | Method for producing high-purity gold and copper sulphate from gold-bearing copper sludge |
| CN104404265A (en) * | 2014-12-02 | 2015-03-11 | 中条山有色金属集团有限公司 | Gold powder washing purification method |
| 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 |
| CN108251647A (en) * | 2017-12-14 | 2018-07-06 | 孙光潮 | The method that the copper-contained sludge obtained by flocculent precipitation Treatment of Copper waste water does copper sponge |
| CN108300870A (en) * | 2017-12-14 | 2018-07-20 | 孙光潮 | The method that copper-contained sludge does copper sponge obtained by flocculent precipitation Treatment of Copper waste water |
| CN108251647B (en) * | 2017-12-14 | 2019-09-24 | 孙光潮 | The method that the copper-contained sludge obtained by flocculent precipitation Treatment of Copper waste water does copper sponge |
| CN112662898A (en) * | 2020-12-02 | 2021-04-16 | 昆明理工大学 | Method for efficiently extracting germanium from zinc-germanium leaching solution |
| CN113388739A (en) * | 2021-06-17 | 2021-09-14 | 福州大学 | Method for recovering precious metals in gold plating wastewater by using natural materials |
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| Publication number | Publication date |
|---|---|
| CN100500600C (en) | 2009-06-17 |
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