CN104193058A - Gold mine cyanide-containing wastewater comprehensive treating method - Google Patents
Gold mine cyanide-containing wastewater comprehensive treating method Download PDFInfo
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- CN104193058A CN104193058A CN201410509928.2A CN201410509928A CN104193058A CN 104193058 A CN104193058 A CN 104193058A CN 201410509928 A CN201410509928 A CN 201410509928A CN 104193058 A CN104193058 A CN 104193058A
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- reverse osmosis
- flocculation agent
- cyanide wastewater
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Abstract
The invention discloses a gold mine cyanide-containing wastewater comprehensive treating method. The method consists of the steps of membrane treatment, acidation stripping treatment, chemical oxidation treatment, coagulating sedimentation treatment and photocatalytic oxidation treatment. In the treatment of the cyanide-containing wastewater, firstly, a membrane treatment method is selected to condense the cyanide-containing wastewater, fresh water is returned to the technological process, for a concentrate, an acidation stripping recycling method is adopted to recycle cyanide in the wastewater, and for the wastewater after the recycle treatment, residual pollutants in the wastewater can be removed through a chemical oxidation method, a coagulating sedimentation method and a photocatalytic oxidation method. According to the characteristics, of being complex in contained pollutants and hard to treat, of the gold mine cyanide-containing wastewater, a membrane treatment process, an acidation stripping recycling process, a chemical oxidation treatment process, a coagulating sedimentation treatment process and a photocatalytic oxidation treatment technology are combined together so as to synergistically treat the gold mine cyanide-containing wastewater; the method has the advantages that the treatment effect is good, the treatment efficiency is high, the technological process is simple, and realization of industrial application is facilitated; the treated wastewater can be returned to the production technology process to be used as recycled water to be used or be discharged after reaching the standard.
Description
Technical field
The present invention relates to field of Environment Protection Pollutant Treatment method, particularly a kind of improvement method of gold mine cyanide wastewater.
Background technology
Gold mine is in process of production owing to using Cyanide Process, can produce a large amount of cyanide wastewater, this part cyanide wastewater not only contains a certain amount of hypertoxic prussiate, but also contain thiocyanate-and copper, zinc, plumbous and so on heavy metal ion, if can not get effective processing, will produce great environmental protection hidden danger.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.Pomolio-Celdecor process can remaining a large amount of chlorine residue after processing, and produces ClCN product, causes secondary pollution problem, and the heavy metal ion such as the copper in waste water, zinc, lead fails effectively to be administered simultaneously.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, processes the waste residue producing in heavy metal process also more, easily causes secondary pollution.Therefore, aspect cyanide wastewater improvement, also still lacking more satisfactory method, if resolve this problem, China's gold industry Sustainable development and Mining Environment Conservation are being had to important meaning.
Summary of the invention
Object of the present invention is exactly the problems referred to above that exist for existing treatment process, and the cyanide wastewater that a kind of technical process is simple, treatment effect good, processing efficiency is high, stable improvement method is provided.The present invention is according to the feature that contains the multiple pollutants such as prussiate, thiocyanate-and heavy metal in gold mine cyanide wastewater, first select membrane processing method that cyanide wastewater is concentrated, clear water returns in technical process, concentrated solution adopts acidifying stripping recovery method to reclaim the prussiate in waste water, and the waste water after recycling is removed the remaining pollutent in waste water by chemical oxidization method, coagulant sedimentation and photocatalytic oxidation.Concrete technology step is as follows:
(1) cyanide wastewater, after grid filtration, is delivered 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 processing, 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 30～40 DEG C of conditions of waste liquid temperature, pass into air and carry out the processing of acidifying stripping, the gas of stripping absorbs with sodium hydroxide solution, and absorption liquid returns in the gold mine technological process of production;
(4) waste liquid after acidifying stripping regulates between pH to 9～11 with alkali lye, adds oxygenant and catalyzer to carry out oxide treatment, treatment time 10min～60min;
(5) waste water after treatment adds successively flocculation agent and flocculation agent carries out coagulating sedimentation under whipped state, and after coagulation, waste water enters settling tank and staticly settles 15min～120min;
(6) supernatant liquor after precipitation enters photocatalysis oxidation reaction system, under ultraviolet ray and nano-titania photocatalyst material effects, remaining pollutent is carried out to degradation treatment, treatment time 15min～120min;
(7) waste water after finishing dealing with 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, 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, and oxygenant is hydrogen peroxide solution, and catalyzer is copper-bath.
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.
In described step (6), photocatalysis oxidation reaction internal system is provided with ultraviolet lamp tube and nano-titania photocatalyst material, and nano titanium oxide evenly spreads upon on the auxiliary facility of reactor wall or inside reactor.
Beneficial effect of the present invention:
The present invention is according to containing pollutent complexity, unmanageable feature in gold mine cyanide wastewater, membrane treatment process, acidifying stripping recovery process, chemical oxidation treatment technique, coagulation-settlement process and photocatalysis oxidation technique are combined, work in coordination with gold mine cyanide wastewater is carried out to advanced treatment, treatment effect is good, processing efficiency is high, system run all right, technical process is simple, be convenient to realize industrial application, waste water after treatment can return to the technological process of production and use or qualified discharge as reuse water.
Embodiment
The present invention includes following steps:
(1) cyanide wastewater, after grid filtration, is delivered 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 processing, 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 30～40 DEG C of conditions of waste liquid temperature, pass into air and carry out the processing of acidifying stripping, the gas of stripping absorbs with sodium hydroxide solution, and absorption liquid returns in the gold mine technological process of production;
(4) waste liquid after acidifying stripping regulates between pH to 9～11 with alkali lye, adds oxygenant and catalyzer to carry out oxide treatment, treatment time 10min～60min;
(5) waste water after treatment adds successively flocculation agent and flocculation agent carries out coagulating sedimentation under whipped state, and after coagulation, waste water enters settling tank and staticly settles 15min～120min;
(6) supernatant liquor after precipitation enters photocatalysis oxidation reaction system, under ultraviolet ray and nano-titania photocatalyst material effects, remaining pollutent is carried out to degradation treatment, treatment time 15min～120min;
(7) waste water after finishing dealing with 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, and oxygenant is hydrogen peroxide solution, and catalyzer is copper-bath.
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.
In described step (6), photocatalysis oxidation reaction internal system is provided with ultraviolet lamp tube and nano-titania photocatalyst material, and nano titanium oxide evenly spreads upon on the auxiliary facility of reactor wall or inside reactor.
Specific examples 1:
Certain gold mine cyanide wastewater, pH is 9.6, CN
tfor 226.25mg/L, SCN
-for 78.24mg/L, Cu
2+for 65.86mg/L, Fe
3+for 7.26mg/L, COD is 214.28mg/L, contains in addition other heavy metal ion of trace.Getting 5L waste water peristaltic pump pumps 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 producing 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, in absorption unit, fill 30% sodium hydroxide solution, at the bottom of blow-off groove interior groove, be provided with air aeration device, blow-off groove is placed in to 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 steel basin, be the sodium hydroxide solution adjusting pH to 10.0 that is 1% with mass percentage concentration under 0.8m/s condition stirring linear velocity, the hydrogen peroxide solution 20mL that interpolation mass percentage concentration is 30%, 5% copper-bath 1mL, reaction 30min, then the polymeric aluminum chlorides solution 5mL that adds 10g/L stirs 5min, then adding mass percentage concentration is 0.5 ‰ anionic polyacrylamide solution 2mL, after continuing to stir 2min, regulate stirring linear velocity 0.1m/s to stir 5min, stop stirring, leave standstill 30min, leave standstill 15min, supernatant liquor is moved in photocatalysis oxidation reaction system and is processed, ultraviolet lamp power is 8W, wavelength is 254nm, treatment time 60min.Waste water through system water outlet after treatment through assay pH between 8～9, CN
t< 0.1mg/L, SCN
-< 0.5mg/L, Cu
2+< 0.5mg/L, COD < 20mg/L, first kind pollutent is all within the highest permission emission concentration limit value, and after processing, water quality can reach reuse or emission standard.
Specific examples 2:
Certain gold mine cyanide wastewater, pH is 10.5, CN
tfor 365.54mg/L, SCN
-for 43.65mg/L, Cu
2+for 26.62mg/L, Pb
2+for 8.37mg/L, COD is 135.45mg/L, contains in addition other heavy metal ion of trace.Getting 5L waste water peristaltic pump pumps 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 producing 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, in absorption unit, fill mass percentage concentration and be 30% sodium hydroxide solution, at the bottom of blow-off groove interior groove, be provided with air aeration device, blow-off groove is placed in to 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 steel basin, be the sodium hydroxide solution adjusting pH to 10.0 that is 1% with mass percentage concentration under 0.8m/s condition stirring linear velocity, the hydrogen peroxide solution 22mL that interpolation mass percentage concentration is 30%, 5% copper-bath 1mL, reaction 30min, then the polymeric aluminum chlorides solution 5mL that adds 10g/L stirs 5min, then adding mass percentage concentration is 0.5 ‰ anionic polyacrylamide solution 2mL, after continuing to stir 2min, regulate stirring linear velocity 0.1m/s to stir 5min, stop stirring, leave standstill 30min, leave standstill 15min, supernatant liquor is moved in photocatalysis oxidation reaction system and is processed, ultraviolet lamp power is 8W, wavelength is 254nm, treatment time 60min.Waste water through system water outlet after treatment through assay pH between 8～9, CN
t< 0.1mg/L, SCN
-< 0.5mg/L, Cu
2+< 0.5mg/L, COD < 20mg/L, first kind pollutent is all within the highest permission emission concentration limit value, and after processing, water quality can reach reuse or emission standard.
Claims (7)
1. a gold mine cyanide wastewater comprehensive processing method, the step of the method is as follows:
(1) cyanide wastewater, after grid filtration, is delivered 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 processing, 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 30～40 DEG C of conditions of waste liquid temperature, pass into air and carry out the processing of acidifying stripping, the gas of stripping absorbs with sodium hydroxide solution, and absorption liquid returns in the gold mine technological process of production;
(4) waste liquid after acidifying stripping regulates between pH to 9～11 with alkali lye, adds oxygenant and catalyzer to carry out oxide treatment, treatment time 10min～60min;
(5) waste water after treatment adds successively flocculation agent and flocculation agent carries out coagulating sedimentation under whipped state, and after coagulation, waste water enters settling tank and staticly settles 15min～120min;
(6) supernatant liquor after precipitation enters photocatalysis oxidation reaction system, under ultraviolet ray and nano-titania photocatalyst material effects, remaining pollutent is carried out to degradation treatment, treatment time 15min～120min;
(7) waste water after finishing dealing with returns in the technological process of production or qualified discharge.
2. a kind of gold mine cyanide wastewater comprehensive processing method according to claim 1, is characterized in that: in described step (1), 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 comprehensive processing 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 comprehensive processing method according to claim 1, 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 comprehensive processing method according to claim 1, is characterized in that: in described step (4), oxygenant is hydrogen peroxide solution, and catalyzer is copper-bath.
6. a kind of gold mine cyanide wastewater comprehensive processing 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.
7. a kind of gold mine cyanide wastewater comprehensive processing method according to claim 1, it is characterized in that: in described step (6), photocatalysis oxidation reaction internal system is provided with ultraviolet lamp tube and nano-titania photocatalyst material, and nano titanium oxide evenly spreads upon on the auxiliary facility of reactor wall or inside reactor.
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Cited By (6)
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| CN104529013A (en) * | 2015-01-01 | 2015-04-22 | 长春黄金研究院 | Cyanide-containing waste water recovery and treatment method |
| CN104876365A (en) * | 2015-05-28 | 2015-09-02 | 长春黄金研究院 | High-concentration cyanogen-contained tailing slurry treatment method for gold industry |
| US9890052B2 (en) * | 2015-09-21 | 2018-02-13 | Veolia Water Solutions & Technologies Support | Method for recovering cyanide from a barren solution |
| CN108689543A (en) * | 2018-06-21 | 2018-10-23 | 招远市招金金合科技有限公司 | A kind of cyanidation tailings select the classification treatment process of sulphur system water |
| CN109354278A (en) * | 2018-10-25 | 2019-02-19 | 上海丽臻环保科技有限公司 | A kind of processing method of small water high-concentration industrial-water |
| CN115920296A (en) * | 2022-12-23 | 2023-04-07 | 四川万里锌业有限公司 | Non-toxic cleaning method for waste slag containing zinc |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104529013A (en) * | 2015-01-01 | 2015-04-22 | 长春黄金研究院 | Cyanide-containing waste water recovery and treatment method |
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| CN108689543B (en) * | 2018-06-21 | 2024-01-19 | 招远市招金金合科技有限公司 | Graded treatment process for cyanide tailings sulfur separation system water |
| CN109354278A (en) * | 2018-10-25 | 2019-02-19 | 上海丽臻环保科技有限公司 | A kind of processing method of small water high-concentration industrial-water |
| CN115920296A (en) * | 2022-12-23 | 2023-04-07 | 四川万里锌业有限公司 | Non-toxic cleaning method for waste slag containing zinc |
| CN115920296B (en) * | 2022-12-23 | 2023-12-08 | 四川万里锌业有限公司 | Non-toxic cleaning method for zinc-containing waste residues |
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