CN104193040B - A kind of gold mine cyanide wastewater integrated conduct method - Google Patents
A kind of gold mine cyanide wastewater integrated conduct method Download PDFInfo
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- CN104193040B CN104193040B CN201410478746.3A CN201410478746A CN104193040B CN 104193040 B CN104193040 B CN 104193040B CN 201410478746 A CN201410478746 A CN 201410478746A CN 104193040 B CN104193040 B CN 104193040B
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- cyanide wastewater
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Abstract
The invention discloses a kind of gold mine cyanide wastewater integrated conduct method, belong to field of Environment Protection Pollutant Treatment method, the method is by film process, the process of acidifying stripping, coagulating kinetics and Chlorine Dioxide Oxidation process four main processing steps compositions, first cyanide wastewater selects membrane processing method to be concentrated by cyanide wastewater when processing, clear water returns in technical process, concentrated solution adopts the prussiate in acidifying stripping recovery method recovery waste water, waste water after recycling removes the pollutent of the remnants in waste water by chlorine oxidation process and coagulant sedimentation.The present invention is according to, unmanageable feature complicated containing pollutent in gold mine cyanide wastewater, membrane treatment process, acidifying stripping recovery process, coagulant sedimentation and chlorine oxidation process are combined, work in coordination with and gold mine cyanide wastewater is processed, treatment effect is good, processing efficiency is high, system run all right, the waste water after process can return the technological process of production and use or qualified discharge as reuse water.
Description
Technical field
The present invention relates to field of Environment Protection Pollutant Treatment method, particularly a kind of gold mine cyanide wastewater integrated conduct method.
Background technology
Gold mine is in process of production owing to using Cyanide Process, a large amount of cyanide wastewater can be produced, this part cyanide wastewater is not only containing a certain amount of hypertoxic prussiate, but also contain the heavy metal ion of thiocyanate-and copper, zinc, lead and so on, if can not get effective process, great environmental protection hidden danger will be produced.At present, the method of conventional Treatment of Cyanide-containing Wastewater has acidifying absorption method, Pomolio-Celdecor process, Yin Kefa, sulfurous gas method etc. both at home and abroad, although adopt acidifying absorption method can reclaim a certain amount of prussiate, but because recovery of cyanide is not thorough, the remaining a certain amount of prussiate of meeting in waste water, thiocyanate ion and some heavy metal ion are not all effectively removed simultaneously.Chlorine residue that can be remaining a large amount of after Pomolio-Celdecor process process, produces ClCN product, causes secondary pollution problem, and the heavy metal ion such as copper, zinc, lead simultaneously in waste water fails effectively to be administered.Although Yin Kefa and sulfurous gas method can make cyanid up to standard, the thiocyanate-in waste water fails to be processed, and in addition, the waste residue produced in process heavy metal process is also more, easily causes secondary pollution.Therefore, also still lack more satisfactory method in cyanide wastewater process, if resolve this problem, have important meaning to China's gold industry Sustainable development and Mining Environment Conservation.
Summary of the invention
Object of the present invention is exactly the problems referred to above existed for existing treatment process, and provides the Treatment of cyanogen-contained wastewater that a kind of technical process is simple, treatment effect good, processing efficiency is high, stable.The present invention is according to the feature containing multiple pollutants such as prussiate, thiocyanate-and heavy metals in gold mine cyanide wastewater, first membrane processing method is selected to be concentrated by cyanide wastewater, clear water returns in technical process, concentrated solution adopts the prussiate in acidifying stripping recovery method recovery waste water, and the waste water after recycling removes the pollutent of the remnants in waste water by chlorine oxidation process and coagulant sedimentation.Concrete technology step is as follows:
(1) cyanide wastewater is after grid filtration, delivers to sand filtration treatment system, removes the macrobead solid pollutant in waste water;
(2) sand filtration processed waste water enters reverse osmosis treatment system and carries out reverse osmosis membrane processing, and after process, the clear liquid of output returns in the gold mine technological process of production, and the concentrated solution of output is for further processing;
(3) reverse osmosis concentrated liquid adds between sulphur acid for adjusting pH to 2 ~ 3, under waste liquid temperature 30 ~ 40 DEG C of conditions, pass into air and carry out the process of acidifying stripping, the gas sodium hydroxide solution of stripping absorbs, and absorption liquid returns in the gold mine technological process of production;
(4) alkali lye of the waste liquid after acidifying stripping regulates between pH to 9 ~ 11, passes into dioxide peroxide and carries out oxide treatment;
(5) it is that 5% ~ 30% solution of zinc sulfate, flocculation agent and flocculation agent carry out coagulating sedimentation that the waste water after process adds concentration successively under whipped state, and after coagulation, waste water enters settling tank and staticly settles 15min ~ 120min;
(6) supernatant liquor after precipitation returns in the technological process of production or qualified discharge.
In described step (1), the filtrate of sand filtration treatment system is quartz sand, hard coal or manganese sand etc., and the particle diameter of filtrate is 0.5mm ~ 5mm.
In described step (2), reverse osmosis treatment system is one or more levels reverse osmosis treatment device, and reverse osmosis membrane adopts alkaline-resisting, resistant to pollution reverse osmosis membrane.
In described step (4), alkali lye is sodium hydroxide solution or milk of lime, dioxide peroxide intake is determined according to the number of the remaining prussiate in waste liquid and COD content and processing requirements, prussiate and COD content is high, process index request tight, the intake of dioxide peroxide is corresponding to be increased, otherwise, prussiate and COD content is low, process index request pine, the corresponding minimizing of intake of dioxide peroxide.
In described step (5), flocculation agent is polymer-inorganic salt flocculation agent, and flocculation agent is polyacrylamide, and flocculation agent and flocculation agent are all mixed with solution state and add.
Beneficial effect of the present invention:
The present invention is according to, unmanageable feature complicated containing pollutent in gold mine cyanide wastewater, membrane treatment process, acidifying stripping recovery process, coagulant sedimentation and chlorine oxidation process are combined, work in coordination with and advanced treatment is carried out to gold mine cyanide wastewater, treatment effect is good, processing efficiency is high, system run all right, technical process is simple, is convenient to realize industrial application, and the waste water after process can return the technological process of production and use or qualified discharge as reuse water.
Embodiment
The present invention includes following steps:
(1) cyanide wastewater is after grid filtration, delivers to sand filtration treatment system, removes the macrobead solid pollutant in waste water;
(2) sand filtration processed waste water enters reverse osmosis treatment system and carries out reverse osmosis membrane processing, and after process, the clear liquid of output returns in the gold mine technological process of production, and the concentrated solution of output is for further processing;
(3) reverse osmosis concentrated liquid adds between sulphur acid for adjusting pH to 2 ~ 3, under waste liquid temperature 30 ~ 40 DEG C of conditions, pass into air and carry out the process of acidifying stripping, the gas sodium hydroxide solution of stripping absorbs, and absorption liquid returns in the gold mine technological process of production;
(4) alkali lye of the waste liquid after acidifying stripping regulates between pH to 9 ~ 11, passes into dioxide peroxide and carries out oxide treatment;
(5) it is that 5% ~ 30% solution of zinc sulfate, flocculation agent and flocculation agent carry out coagulating sedimentation that the waste water after process adds concentration successively under whipped state, and after coagulation, waste water enters settling tank and staticly settles 15min ~ 120min;
(6) supernatant liquor after precipitation returns in the technological process of production or qualified discharge.
In described step (1), the filtrate of sand filtration treatment system is quartz sand, hard coal or manganese sand etc., and the particle diameter of filtrate is 0.5mm ~ 5mm.
In described step (2), reverse osmosis treatment system is one or more levels reverse osmosis treatment device, and reverse osmosis membrane adopts alkaline-resisting, resistant to pollution reverse osmosis membrane.
In described step (4), alkali lye is sodium hydroxide solution or milk of lime, dioxide peroxide intake is determined according to the number of the remaining prussiate in waste liquid and COD content and processing requirements, prussiate and COD content is high, process index request tight, the intake of dioxide peroxide is corresponding to be increased, otherwise, prussiate and COD content is low, process index request pine, the corresponding minimizing of intake of dioxide peroxide.
In described step (5), flocculation agent is polymer-inorganic salt flocculation agent, and flocculation agent is polyacrylamide, and flocculation agent and flocculation agent are all mixed with solution state and add.
Specific examples 1:
Certain gold mine cyanide wastewater, pH is 9.8, CN
tfor 627.38mg/L, SCN-be 69.36mg/L, Cu
2+for 136.47mg/L, COD are 207.46mg/L, NH
3-N is 48.95mg/L, other heavy metal ion in addition containing trace.Getting 5L waste water peristaltic pump is pumped in quartz sand filtration post, quartz sand particle size is 1 ~ 2mm, waste water after filtration is passed in flat plate reverse osmosis membrane pilot unit contained, the concentrated solution produced after reverse-osmosis treated is placed in blow-off groove, blow-off groove is a stainless steel tightness system, outside is provided with liquid-inlet pipe, drain pipe, chemical feed pipe, escape pipe, pH meter, thermometer and tensimeter, escape pipe connects absorption unit, the sodium hydroxide solution of 30% is filled in absorption unit, air aeration device is provided with at the bottom of blow-off groove interior groove, blow-off groove is placed in thermostatically heating to 30 DEG C in water-bath, add the vitriol oil, regulate between waste liquor PH to 2 ~ 3, open aerating apparatus, stripping 20min, waste liquid after stripping is placed in chlorine dioxide reaction device, chlorine dioxide reaction device interior bottom portion is provided with ceramic micropore aerator, pH to 10.0 is regulated with sodium hydroxide solution, open chlorine dioxide generator, pass into chlorine dioxide reaction 30min, dioxide peroxide intake is 1240mg, reaction terminates rear stopping and passing into dioxide peroxide, waste water is moved in steel basin, open and stir, 5% solution of zinc sulfate 5mL is added successively under stirring linear velocity is 0.8m/s condition, the polymeric aluminum chlorides solution 15mL of 10g/L stirs 5min, then 0.5 ‰ anionic polyacrylamide solution 4mL are added, regulate after continuing to stir 2min and stir linear velocity 0.1m/s stirring 5min, stop stirring, leave standstill 30min, get supernatant liquor assay and obtain pH between 8 ~ 9, CN
t< 0.1mg/L, SCN-< 0.5mg/L, Cu
2+< 0.5mg/L, COD < 20mg/L, NH
3-N < 1.0mg/L, first kind pollutent is all within the highest permission emission concentration limit value, and after process, water quality can reach reuse or emission standard.
Specific examples 2:
Certain gold mine cyanide wastewater, pH is 9.2, CN
tfor 445.23mg/L, SCN-be 16.69mg/L, Cu
2+for 48.55mg/L, Pb
2+for 8.75mg/L, COD are 119.65mg/L, NH
3-N is 23.41mg/L, other heavy metal ion in addition containing trace.Getting 5L waste water peristaltic pump is pumped in quartz sand filtration post, quartz sand particle size is 1 ~ 2mm, waste water after filtration is passed in flat plate reverse osmosis membrane pilot unit contained, the concentrated solution produced after reverse-osmosis treated is placed in blow-off groove, blow-off groove is a stainless steel tightness system, outside is provided with liquid-inlet pipe, drain pipe, chemical feed pipe, escape pipe, pH meter, thermometer and tensimeter, escape pipe connects absorption unit, the sodium hydroxide solution of 30% is filled in absorption unit, air aeration device is provided with at the bottom of blow-off groove interior groove, blow-off groove is placed in thermostatically heating to 30 DEG C in water-bath, add the vitriol oil, regulate between waste liquor PH to 2 ~ 3, open aerating apparatus, stripping 20min, waste liquid after stripping is placed in chlorine dioxide reaction device, chlorine dioxide reaction device interior bottom portion is provided with ceramic micropore aerator, pH to 10.0 is regulated with sodium hydroxide solution, open chlorine dioxide generator, pass into chlorine dioxide reaction 30min, dioxide peroxide intake is 950mg, reaction terminates rear stopping and passing into dioxide peroxide, waste water is moved in steel basin, open and stir, 5% solution of zinc sulfate 5mL is added successively under stirring linear velocity is 0.8m/s condition, the polymeric aluminum chlorides solution 15mL of 10g/L stirs 5min, then 0.5 ‰ anionic polyacrylamide solution 4mL are added, regulate after continuing to stir 2min and stir linear velocity 0.1m/s stirring 5min, stop stirring, leave standstill 30min, get supernatant liquor assay and obtain pH between 8 ~ 9, CN
t< 0.1mg/L, SCN-< 0.5mg/L, Cu
2+< 0.5mg/L, COD < 20mg/L, NH
3-N < 1.0mg/L, first kind pollutent is all within the highest permission emission concentration limit value, and after process, water quality can reach reuse or emission standard.
Claims (5)
1. a gold mine cyanide wastewater integrated conduct method, the step of the method is as follows:
(1) cyanide wastewater is after grid filtration, delivers to sand filtration treatment system, removes the macrobead solid pollutant in waste water;
(2) sand filtration processed waste water enters reverse osmosis treatment system and carries out reverse osmosis membrane processing, and after process, the clear liquid of output returns in the gold mine technological process of production, and the concentrated solution of output is for further processing;
(3) reverse osmosis concentrated liquid adds between sulphur acid for adjusting pH to 2 ~ 3, under waste liquid temperature 30 ~ 40 DEG C of conditions, pass into air and carry out the process of acidifying stripping, the gas sodium hydroxide solution of stripping absorbs, and absorption liquid returns in the gold mine technological process of production;
(4) alkali lye of the waste liquid after acidifying stripping regulates between pH to 9 ~ 11, passes into dioxide peroxide and carries out oxide treatment;
(5) it is that 5% ~ 30% solution of zinc sulfate, flocculation agent and flocculation agent carry out coagulating sedimentation that the waste water after process adds concentration successively under whipped state, and after coagulation, waste water enters settling tank and staticly settles 15min ~ 120min;
(6) supernatant liquor after precipitation returns in the technological process of production or qualified discharge.
2. a kind of gold mine cyanide wastewater integrated conduct method according to claim 1, is characterized in that: in described step (1), and the filtrate of sand filtration treatment system is quartz sand, hard coal or manganese sand, and the particle diameter of filtrate is 0.5mm ~ 5mm.
3. a kind of gold mine cyanide wastewater integrated conduct method according to claim 1, it is characterized in that: in described step (2), reverse osmosis treatment system is one or more levels reverse osmosis treatment device, and reverse osmosis membrane adopts alkaline-resisting, resistant to pollution reverse osmosis membrane.
4. a kind of gold mine cyanide wastewater integrated conduct method according to claim 1, it is characterized in that: in described step (4), alkali lye is sodium hydroxide solution or milk of lime.
5. a kind of gold mine cyanide wastewater integrated conduct method according to claim 1, it is characterized in that: in described step (5), flocculation agent is polymer-inorganic salt flocculation agent, and flocculation agent is polyacrylamide, and flocculation agent and flocculation agent are all mixed with solution state and add.
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| CN105776765A (en) * | 2016-04-29 | 2016-07-20 | 广东新大禹环境科技股份有限公司 | Cyanide-containing wastewater treatment method |
| CN109354328B (en) * | 2018-12-10 | 2019-07-12 | 国家地质实验测试中心 | A kind of acidic mine waste water processing system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101456637A (en) * | 2008-11-25 | 2009-06-17 | 天津大学 | Treatment process and method of electroplating wastewater |
| CN101759274A (en) * | 2010-01-11 | 2010-06-30 | 长春黄金研究院 | Recycling and harmless treatment method for cyaniding tailing slurry |
| CN102502994A (en) * | 2011-11-09 | 2012-06-20 | 北京纬纶华业环保科技股份有限公司 | Method and system for treating cyanide-containing wastewater at low concentration |
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| JP5143790B2 (en) * | 2009-06-22 | 2013-02-13 | 新日鉄住金エンジニアリング株式会社 | Cyanogen-contaminated groundwater treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101456637A (en) * | 2008-11-25 | 2009-06-17 | 天津大学 | Treatment process and method of electroplating wastewater |
| CN101759274A (en) * | 2010-01-11 | 2010-06-30 | 长春黄金研究院 | Recycling and harmless treatment method for cyaniding tailing slurry |
| CN102502994A (en) * | 2011-11-09 | 2012-06-20 | 北京纬纶华业环保科技股份有限公司 | Method and system for treating cyanide-containing wastewater at low concentration |
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