CN104193058B - A kind of gold mine cyanide wastewater comprehensive processing method - Google Patents

A kind of gold mine cyanide wastewater comprehensive processing method Download PDF

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CN104193058B
CN104193058B CN201410509928.2A CN201410509928A CN104193058B CN 104193058 B CN104193058 B CN 104193058B CN 201410509928 A CN201410509928 A CN 201410509928A CN 104193058 B CN104193058 B CN 104193058B
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cyanide wastewater
gold mine
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waste water
processing method
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CN104193058A (en
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刘强
李哲浩
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Changchun Gold Research Institute
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Changchun Gold Research Institute
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Abstract

The invention discloses a kind of gold mine cyanide wastewater comprehensive processing method, the method is made up of film process, the process of acidifying stripping, chemical oxidation treatment, coagulating kinetics and Treatment by Photocatalysis Oxidation step, 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, and the waste water after recycling removes the pollutent of the remnants in waste water by chemical oxidization method, coagulant sedimentation and photocatalytic oxidation.The present invention is according to, unmanageable feature complicated containing pollutent in gold mine cyanide wastewater, by membrane treatment process, acidifying stripping recovery process, chemical oxidation treatment technique, coagulating kinetics technique together with Treatment by Photocatalysis Oxidation combine with technique, work in coordination with and gold mine cyanide wastewater is processed, have that treatment effect is good, processing efficiency is high, technical process is simple, be convenient to realize the advantages such as industrial application, the waste water after process can return the technological process of production and use or qualified discharge as reuse water.

Description

A kind of gold mine cyanide wastewater comprehensive processing method
Technical field
The present invention relates to field of Environment Protection Pollutant Treatment method, particularly a kind of administering method of gold mine cyanide wastewater.
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 improvement, 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 cyanide wastewater administering method 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 chemical oxidization method, coagulant sedimentation and photocatalytic oxidation.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, adds oxygenant and catalyzer carries out oxide treatment, treatment time 10min ~ 60min;
(5) waste water after process adds flocculation agent successively under whipped state and flocculation agent carries out coagulating sedimentation, and after coagulation, waste water enters settling tank and staticly settles 15min ~ 120min;
(6) supernatant liquor after precipitation enters photocatalysis oxidation reaction system, carries out degradation treatment, treatment time 15min ~ 120min under ultraviolet and nano-titania photocatalyst material effects to the pollutent of remnants;
(7) waste water after having processed 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 uniform application is on the auxiliary facility of reactor wall or inside reactor.
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, chemical oxidation treatment technique, coagulation-settlement process and photocatalysis oxidation technique 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, be convenient to realize industrial application, 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, adds oxygenant and catalyzer carries out oxide treatment, treatment time 10min ~ 60min;
(5) waste water after process adds flocculation agent successively under whipped state and flocculation agent carries out coagulating sedimentation, and after coagulation, waste water enters settling tank and staticly settles 15min ~ 120min;
(6) supernatant liquor after precipitation enters photocatalysis oxidation reaction system, carries out degradation treatment, treatment time 15min ~ 120min under ultraviolet and nano-titania photocatalyst material effects to the pollutent of remnants;
(7) waste water after having processed 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 uniform application is 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 are 214.28mg/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 steel basin, pH to 10.0 is regulated with the sodium hydroxide solution that mass percentage concentration is 1% under stirring linear velocity is 0.8m/s condition, add the hydrogen peroxide solution 20mL that mass percentage concentration is 30%, the copper-bath 1mL of 5%, reaction 30min, then the polymeric aluminum chlorides solution 5mL adding 10g/L stirs 5min, then adding mass percentage concentration is 0.5 ‰ anionic polyacrylamide solution 2mL, regulate after continuing to stir 2min and stir linear velocity 0.1m/s stirring 5min, stop stirring, leave standstill 30min, leave standstill 15min, supernatant liquor is moved in photocatalysis oxidation reaction system and processes, ultraviolet lamp power is 8W, wavelength is 254nm, treatment time 60min.The water outlet of waste water after system process 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 process, 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 are 135.45mg/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 that mass percentage concentration is 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 steel basin, pH to 10.0 is regulated with the sodium hydroxide solution that mass percentage concentration is 1% under stirring linear velocity is 0.8m/s condition, add the hydrogen peroxide solution 22mL that mass percentage concentration is 30%, the copper-bath 1mL of 5%, reaction 30min, then the polymeric aluminum chlorides solution 5mL adding 10g/L stirs 5min, then adding mass percentage concentration is 0.5 ‰ anionic polyacrylamide solution 2mL, regulate after continuing to stir 2min and stir linear velocity 0.1m/s stirring 5min, stop stirring, leave standstill 30min, leave standstill 15min, supernatant liquor is moved in photocatalysis oxidation reaction system and processes, ultraviolet lamp power is 8W, wavelength is 254nm, treatment time 60min.The water outlet of waste water after system process 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 process, 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 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, adds oxygenant and catalyzer carries out oxide treatment, treatment time 10min ~ 60min;
(5) waste water after process adds flocculation agent successively under whipped state and flocculation agent carries out coagulating sedimentation, and after coagulation, waste water enters settling tank and staticly settles 15min ~ 120min;
(6) supernatant liquor after precipitation enters photocatalysis oxidation reaction system, carries out degradation treatment, treatment time 15min ~ 120min under ultraviolet and nano-titania photocatalyst material effects to the pollutent of remnants;
(7) waste water after having processed 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), 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 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, 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 comprehensive processing method according to claim 1, it 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 uniform application is on the auxiliary facility of reactor wall or inside reactor.
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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
CA2941223C (en) * 2015-09-21 2018-09-25 Veolia Water Solutions & Technologies Support Method for recovering cyanide from a barren solution
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
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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