CN107445277A - Processing method, equipment and its application of cyanide wastewater - Google Patents
Processing method, equipment and its application of cyanide wastewater Download PDFInfo
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- CN107445277A CN107445277A CN201710889012.8A CN201710889012A CN107445277A CN 107445277 A CN107445277 A CN 107445277A CN 201710889012 A CN201710889012 A CN 201710889012A CN 107445277 A CN107445277 A CN 107445277A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1425—Regeneration of liquid absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1431—Pretreatment by other processes
- B01D53/1443—Pretreatment by diffusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/229—Integrated processes (Diffusion and at least one other process, e.g. adsorption, absorption)
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/408—Cyanides, e.g. hydrogen cyanide (HCH)
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/18—Cyanides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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Abstract
The present invention provides a kind of processing method of cyanide wastewater, equipment and its application, is related to field of Environment Protection.The processing equipment includes hydrophobic hollow fiber film and housing, housing has cavity, hydrophobic hollow fiber film is connected with housing and cavity is divided into the first cavity for the alkali lye that circulates and the second cavity for the cyanide wastewater that circulates, and its is simple in construction, easy to operation.Application of the above-mentioned processing equipment in Treatment of Cyanide-containing Wastewater, is effectively improved except cyanogen efficiency.The processing method includes：After cyanide wastewater acidification, the second cavity for adding filtrate in above-mentioned processing equipment after filtering, alkali lye is added into the first cavity, make the free Cyanide in filtrate in the case where the draught head of the both sides of hydrophobic hollow fiber film promotes by hydrophobic hollow fiber membrane diffusion to alkali lye, effectively improve and remove cyanogen efficiency, except total cyanogen clearance reaches more than 95% in the filtrate after cyanogen.
Description
Technical field
The present invention relates to field of Environment Protection, and the more particularly to a kind of processing method of cyanide wastewater, equipment and its application.
Background technology
With the raising of people's environmental consciousness and the guiding of national environmental protection policy, the harmless treatment of smelting wastewater and
Recycling turns into mainstream development direction.Cyanide wastewater refers to the industrial wastewater containing CN groups.Especially in the selecting of gold mine
It can discharge in the field production processes such as smelting, the recovery of cyanidation tailings secondary resource, cyanide electroplating, chemical industry and largely be given up containing cyanogen
Water.Especially gold smelting process needs to use Cyanide Leaching, produces a large amount of cyanide wastewater, also contains substantial amounts of weight in waste water
Metal, directly discharge will seriously pollute external environment.As long as domestic Treatment of Cyanide-containing Wastewater thinking at present is high cyanide containing wastewater
Handle the simultaneously valuable material such as recovery of cyanide；Low cyanide wastewater directly turns harmful cyanide using broken cyanide technology
Innocuous substance is turned to, realizes the purpose of qualified discharge.The industrial method using comparative maturity has acidifying absorption method, sulfur dioxide
~air oxidation process, chemical oxidization method, microbial degradation method etc..
At present in practical engineering application, most gold smelting industries is all highly concentrated using acidifying oxidative treatment
Spend cyanide wastewater and then carry out depth using sulfur dioxide~air oxidation process and remove cyanogen, but technological process length be present, equipment is numerous
The drawbacks such as more, operating cost height.
The content of the invention
It is an object of the invention to provide a kind of processing equipment of cyanide wastewater, its is simple in construction, easy to operation, is given up containing cyanogen
The treatment effect of water is good.
Another object of the present invention is to provide application of the above-mentioned processing equipment in Treatment of Cyanide-containing Wastewater, effectively improve and remove
Cyanogen efficiency, except total cyanogen clearance reaches more than 95% in the filtrate after cyanogen.
Another object of the present invention is to provide a kind of processing method of cyanide wastewater, it effectively improves except cyanogen efficiency, removed
Total cyanogen clearance reaches more than 95% in filtrate after cyanogen.
The present invention is solved its technical problem and realized using following technical scheme.
The present invention proposes a kind of processing equipment of cyanide wastewater, and it includes hydrophobic hollow fiber film and housing, housing
With cavity, hydrophobic hollow fiber film is connected with housing and cavity is divided into for the first cavity of the alkali lye that circulates and for flowing
Second cavity of logical cyanide wastewater.
The present invention proposes a kind of application of above-mentioned processing equipment in Treatment of Cyanide-containing Wastewater.
The present invention proposes a kind of processing method of cyanide wastewater, and it includes：
After cyanide wastewater acidification, filtering, filtrate is obtained.
The second cavity that filtrate is added in above-mentioned processing equipment, alkali lye is added into the first cavity, made free in filtrate
Cyanogen is in the case where the draught head of the both sides of hydrophobic hollow fiber film promotes by hydrophobic hollow fiber membrane diffusion to alkali lye.
Processing method, equipment and its beneficial effect of application of the cyanide wastewater of the embodiment of the present invention be：
By the use of hydrophobic hollow fiber film as cyanide wastewater and alkali lye barrier, the hydrophobic of hydrophobic hollow fiber film is utilized
Structure only allows gas by the way that the free Cyanide in cyanide wastewater exists in the two alternate air film structures for providing one layer very thin, this structure
Under the promotion of partial pressure difference, diffuse through fenestra and enter alkali lye side, removed by the irreversible absorption of alkali lye, equivalent to air solution
Inhale tower and chemical absorbing tower is combined into one while occurred in the processing equipment of an efficient cyanide wastewater, directly with neutralization reaction
Chemical potential become turn to motive force, series reaction Process fusions such as " strippings~diffusion~absorption " is efficiently given up at one containing cyanogen
Carried out in the processing equipment of water, only need to consume a small amount of pump liquid electric power, heat energy need not be consumed, and the high-purity highly concentrated cyaniding that will be obtained
The aqueous solution of salt, cyanide salt recovery is carried out, while the treatment fluid Returning process after precipitation cyanide salt is recycled.
The processing method technology of cyanide wastewater is simple, equipment investment is few, stable, and this method can be reduced effectively containing cyanogen
Cyanide in Waste Water compound content.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by embodiment it is required use it is attached
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore be not construed as pair
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 is the process chart of the processing method of cyanide wastewater provided by the invention；
Fig. 2 is the structural representation of the processing equipment for the cyanide wastewater that first embodiment of the invention provides；
Fig. 3 is the structural representation of the processing equipment for the cyanide wastewater that second embodiment of the invention provides.
In figure：The processing equipment of 10a- cyanide wastewater；The processing equipment of 10b- cyanide wastewater；110- hydrophobic hollow fibers
Film；120- housings；130- cavitys；The cavitys of 131- first；The cavitys of 133- second.
Embodiment
, below will be in the embodiment of the present invention to make the purpose, technical scheme and advantage of the embodiment of the present invention clearer
Technical scheme be clearly and completely described.Unreceipted actual conditions person, builds according to normal condition or manufacturer in embodiment
The condition of view is carried out.Agents useful for same or the unreceipted production firm person of instrument, it is the conventional production that can be obtained by commercially available purchase
Product.
Processing method, equipment and its application to the cyanide wastewater of the embodiment of the present invention are specifically described below.
The present invention provides a kind of processing equipment of cyanide wastewater, and it includes hydrophobic hollow fiber film and housing, housing
With cavity, hydrophobic hollow fiber film is connected with housing and cavity is divided into the first cavity for holding alkali lye and for containing
Put the second cavity of cyanide wastewater.
The present invention provides a kind of application of processing equipment of above-mentioned cyanide wastewater in Treatment of Cyanide-containing Wastewater.
Referring to Fig. 1, the present invention provides a kind of processing method of cyanide wastewater, it includes：
First, by after cyanide wastewater acidification, filtering, filtrate is obtained.
Specifically, the total cyanogen concentration in cyanide wastewater can be raised to several gram liters from tens milligrams, in of the invention, for concentration
Scope no requirement (NR).Wherein, the free cyanogen content in cyanide wastewater is higher, and the later stage is higher except cyanogen efficiency.
Because what is in cyanide wastewater, contained is mostly metal top cradle, therefore waste water is acidified by being acidified, it is preferable that
In preferred embodiments of the present invention, the pH value of the cyanide wastewater after acidification is 1.5~2.5, makes metal top cradle abundant
Generation HCN is decomposed, only 25.6 DEG C of HCN boiling point, by making HCN volatilize to useless Aeration in the water, the HCN of volatilization is used existing technology
Alkali lye (NaOH) absorbs recovery and used, but this method has the drawbacks such as operating cost height.
Acidification can select sulfuric acid, nitric acid, hydrochloric acid etc., but because nitric acid and hydrochloric acid have volatility, have larger
Danger, it is preferable that in preferred embodiments of the present invention, cyanide wastewater using sulfuric acid carry out acidification.Preferably dilute sulphur
Acid, dilute sulfuric acid herein refer to that sulfuric acid content is less than the sulfuric acid of the concentration of the concentrated sulfuric acid, and the content of the concentrated sulfuric acid herein is common
The content of the commercially available concentrated sulfuric acid.Preferably, dilute sulfuric acid refers to be 1 by volume:1 is obtained by mixing sulfuric acid and water.
Cyanide wastewater after acidification is filtered, for effective organics removal and its larger contained
Grain thing, the hole on follow-up organic matter and larger particulate matter blocking hydrophobic hollow fiber film is prevented, is caused at cyanide wastewater
Manage it is ineffective, and the drawbacks of be unable to continuous processing.
Preferably, in preferred embodiments of the present invention, the particle diameter of the particulate matter in filtrate after filtering is less than 21um, mistake
Filtrate after filter is free of organic matter.
Wherein, filtering can use sealing plate-frame filtering, sand filtration, carbon filter, security personnel's filtering and reverse osmosis membrane filtration etc., such as
Be filtered into through reverse osmosis membrane filtration, or any combination in five, it is preferable that be filtered into successively sealed plate-frame filtering, sand filtration,
Carbon filter, security personnel's filtering and reverse osmosis membrane filtration, obtain filtrate, effectively remove large particulate matter and organic matter.
Then, the second cavity filtrate added in above-mentioned processing equipment, alkali lye is added into the first cavity, the trip in filtrate
From cyanogen the both sides of hydrophobic hollow fiber film draught head promote under after hydrophobic hollow fiber membrane diffusion to alkali lye, first
Cyaniding salting liquid is obtained in cavity.
By the use of hydrophobic hollow fiber film as filtrate and the barrier of alkali lye, hydrophobic structure alternate provides one layer very two
Thin air film structure, this structure only allow gas by the way that the free Cyanide in filtrate diffuses through hydrophobic under the promotion of partial pressure difference
Property hollow-fibre membrane fenestra enter the film of hydrophobic hollow fiber film and be located at the side of alkali lye, free Cyanide is by the irreversible suction of alkali lye
Receive and removed.It is combined into one equivalent to air desorber and chemical absorbing tower, occurs simultaneously, directly with the change of neutralization reaction
Degree, which becomes, turns to motive force, only need to consume a small amount of pump liquid electric power, need not consume heat energy, and byproduct is high-purity highly concentrated Cymag
Saline solution, it can be sold off using reuse Returning process or as product.
Specifically, alkali lye can be NaOH solution, KOH solution, Ca (OH)2The highly basic such as solution, it is preferable that the present invention is preferably
Embodiment in, alkali lye is NaOH solution or KOH solution, preferably NaOH solution, and its alkalescence is strong, nontoxic, while industrial cost
It is relatively low.
Preferably, in preferred embodiments of the present invention, the concentration of NaOH solution is 5~10wt%, such as NaOH solution
Concentration is 5wt%, 6wt%, 7wt%, 8wt% or 10wt% etc., is effectively reacted with free Cyanide.
In order to further increase, the treatment effeciency of NaOH solution and filtrate, it is preferable that NaOH solution is relative to each other with filtrate
Counter-current flow, effectively increase the contact area of the two, effectively increase treatment effeciency.Wherein, alkali lye and the flow of filtrate be herein
It is not specifically limited.
Preferably, sodium cyanide solution is freezed, makes separation of solid and liquid after its crystallization, obtain cyanide salt and treatment fluid, more preferably
Ground, treatment fluid is added into the first cavity, the supplement as alkali lye.Not only make the cyanide salt in solution crystallize with crystal form to analyse
Go out, the crystal of the Cymag can be sold off as byproduct；Solution crystallize simultaneously after is mainly sodium hydroxide raffinate, and solid-liquid divides
From rear, the compensation liquid using obtained treatment fluid as alkali lye, the consumption of alkali can be greatlyd save.
Preferably, crystallize to freeze 1.5~2h at 0~-1 DEG C, effectively improve the precipitation efficiency of Cymag.
Preferably, it is stirred in crystallization process with 100~150r/min speed, makes further to improve Cymag
Precipitation efficiency.
The feature and performance of the present invention are described in further detail with reference to embodiments.
Embodiment 1
Referring to Fig. 2, the present invention provides a kind of processing equipment 10a of cyanide wastewater, it includes hydrophobic hollow fiber film
110 and housing 120.
Housing 120 has cavity 130, and hydrophobic hollow fiber film 110 is connected with housing 120 and cavity 130 is divided into
One cavity 131 and the second cavity 133.
Specifically, the processing equipment 10a of cyanide wastewater is cylinder, and hydrophobic hollow fiber film 110 surrounds dredging for tubulose
Water-based hollow fiber film tube, the inwall of hydrophobic hollow fiber membrane tube surround the second cavity 133, hydrophobic hollow fiber membrane tube
Outer wall surrounds the first cavity 131 with housing 120.
Preferably, the first cavity 131 is used to hold alkali lye, and the second cavity 133 is used to hold cyanide wastewater, effectively increases alkali
Attraction of the liquid for the free Cyanide in cyanide wastewater.
Preferably, the first cavity 131 has the first inlet (not shown) and the first liquid outlet (not shown), the second cavity
133 have the second inlet (not shown) and the second liquid outlet (not shown), wherein, the processing equipment 10a of cyanide wastewater is vertical
Installation, because HCN has volatility, in order to increase its reaction efficiency with alkali lye, it is preferable that the first inlet is located to give up containing cyanogen
The one end of processing equipment 10a away from ground of water, the first liquid outlet are located at the processing equipment 10a equipment of cyanide wastewater close to ground
One end, the processing equipment 10a equipment that the second inlet is located at cyanide wastewater gives up close to the one end on ground, the second liquid outlet containing cyanogen
The one end of processing equipment 10a away from ground of water.
Embodiment 2
Referring to Fig. 3, the present invention provides a kind of processing equipment 10b of cyanide wastewater, it includes hydrophobic hollow fiber film
110 and housing 120.
Housing 120 has cavity 130, and hydrophobic hollow fiber film 110 is connected with housing 120, specifically, with housing 120
Axis direction be longitudinal direction, hydrophobic hollow fiber film 110 laterally sets that cavity 130 is divided into the first cavity 131 and second is empty
Chamber 133.
Specifically, the processing equipment 10b of cyanide wastewater is cylinder, and hydrophobic hollow fiber film 110 is sheet.
Preferably, the first cavity 131 is used to hold alkali lye, and the second cavity 133 is used to hold cyanide wastewater, effectively increases alkali
Attraction of the liquid for the free Cyanide in cyanide wastewater.
Preferably, the first cavity 131 has the first inlet and the first liquid outlet, and the second cavity 133 has the second feed liquor
Mouth and the second liquid outlet, wherein, the processing equipment 10b of cyanide wastewater is vertically installed, because HCN has volatility, in order to increase
Its reaction efficiency with alkali lye, it is preferable that the first inlet is located at the one end of processing equipment 10b away from ground of cyanide wastewater,
The processing equipment 10b that first liquid outlet is located at cyanide wastewater is located at the place of cyanide wastewater close to the one end on ground, the second inlet
Equipment 10b is managed close to the one end on ground, the one end of processing equipment 10b away from ground of the second liquid outlet cyanide wastewater.
Embodiment 3
A kind of processing method of cyanide wastewater, the total cyanide content of the cyanide wastewater is 400mg/L, the cyanide wastewater
PH=4.68.The processing method comprises the following steps：
Dilute sulfuric acid is added into cyanide wastewater, the pH value of cyanide wastewater is adjusted to 1.5, carries out acidification reaction；Wherein dilute sulphur
Acid is 1 according to volume ratio:1 is obtained by mixing sulfuric acid and water.
Cyanide wastewater after the completion of acidification reaction passes through successively through sand filtration, carbon filter, accurate filter and reverse osmosis membrane filtration
Filtrate is detected after four filtration systems, the grain graininess in filtrate is less than 20um, without organic matter.
Obtained filtrate is entered in the processing equipment for the cyanide wastewater that embodiment 1 or embodiment 2 provide, filtrate is pumped into
Second cavity, while 5wt% NaOH solution is pumped into the first cavity, specifically, filtrate enters the flow 43.2L/ of the second cavity
H, the flow of NaOH solution is 180L/h.
After testing, cyanide wastewater circulation primary in the processing equipment for the cyanide wastewater that embodiment 1 or embodiment 2 provide
Afterwards, outflow contains after cyanogen that total cyanogen content is reduced to 4.44mg/L in liquid, and Hydrolysis rate reaches 98.89%；By 2 circulations, containing cyanogen
Total cyanogen is reduced within 1.5mg/L in liquid afterwards.
The cyaniding salting liquid obtained in the first cavity will be placed in electricity condensation kettle and is cooled to -1 DEG C after 2 circulations,
Speed of agitator 100r/min, cool time 2h, the Cymag in solution is crystallized with crystal form to be separated out, after separation of solid and liquid, recovery
Cymag, obtained treatment fluid is reclaimed and adds supplement of second cavity as alkali lye.
Embodiment 4
A kind of processing method of cyanide wastewater, the total cyanide content of the cyanide wastewater is 110.92mg/L, and this contains cyanogen and given up
The pH=5.2 of water.The processing method comprises the following steps：
Dilute sulfuric acid is added into cyanide wastewater, the pH value of cyanide wastewater is adjusted to 2.0, carries out acidification reaction；Wherein dilute sulphur
Acid is 1 according to volume ratio:1 is obtained by mixing sulfuric acid and water.
Cyanide wastewater after the completion of acidification reaction passes through successively through sand filtration, carbon filter, accurate filter and reverse osmosis membrane filtration
Filtrate is detected after four filtration systems, the grain graininess in filtrate is less than 20um, and organic matter is free of in filtrate.
Obtained filtrate is entered in the processing equipment for the cyanide wastewater that embodiment 1 or embodiment 2 provide, filtrate is pumped into
Second cavity, while 5wt% NaOH solution is pumped into the first cavity, specifically, the flow that filtrate enters the second cavity is 54L/
H, the flow of NaOH solution is 220L/h.
After testing, cyanide wastewater circulates for the first time in the processing equipment for the cyanide wastewater that embodiment 1 or embodiment 2 provide
Afterwards, outflow contains after cyanogen that total cyanogen content is reduced to 8.37mg/L in liquid, and Hydrolysis rate reaches 92.45%；After first time is circulated
Enter film circulation again containing liquid after cyanogen, after 4 circulations containing cyanogen after total cyanogen content in liquid be 1.83mg/L.
The cyaniding salting liquid obtained in the first cavity will be placed in electricity condensation kettle and is cooled to -0.5 after 4 circulations
DEG C, speed of agitator 125r/min, cool time 1.5h, the Cymag in solution is crystallized with crystal form to be separated out, after separation of solid and liquid,
Cymag is reclaimed, obtained treatment fluid is reclaimed and adds supplement of second cavity as alkali lye.
Embodiment 5
A kind of processing method of cyanide wastewater, the total cyanide content of the cyanide wastewater are 79.56mg/L, the cyanide wastewater
PH=5.2.The processing method comprises the following steps：
Dilute sulfuric acid is added into cyanide wastewater, the pH value of cyanide wastewater is adjusted to 1.83, carries out acidification reaction；Wherein dilute sulphur
Acid is 1 according to volume ratio:1 is obtained by mixing sulfuric acid and water.
Cyanide wastewater after the completion of acidification reaction passes through successively through sand filtration, carbon filter, accurate filter and reverse osmosis membrane filtration
Filtrate is detected after four filtration systems, the grain graininess in filtrate is less than 20um, and organic matter is free of in filtrate.
Obtained filtrate is entered in the processing equipment for the cyanide wastewater that embodiment 1 or embodiment 2 provide, filtrate is pumped into
Second cavity, while 5wt% NaOH solution is pumped into the first cavity, specifically, the flow that filtrate enters the second cavity is 45L/
H, the flow of NaOH solution is 250L/h.
After testing, cyanide wastewater circulates for the first time in the processing equipment for the cyanide wastewater that embodiment 1 or embodiment 2 provide
Afterwards, outflow contains after cyanogen that total cyanogen content is reduced to 11.59mg/L in liquid, and Hydrolysis rate reaches 85.43%；After first time is circulated
Enter film circulation again containing liquid after cyanogen, after 4 circulations containing cyanogen after total cyanogen content in liquid be 5.10mg/L.
The cyaniding salting liquid obtained in the first cavity will be placed in electricity condensation kettle and is cooled to -1 DEG C after 4 circulations,
Speed of agitator 150r/min, cool time 2h, the Cymag in solution is crystallized with crystal form to be separated out, after separation of solid and liquid, recovery
Cymag, obtained treatment fluid is reclaimed and adds supplement of second cavity as alkali lye.
To sum up, the processing equipment of cyanide wastewater provided in an embodiment of the present invention, its is simple in construction, easy to operation, is given up containing cyanogen
The treatment effect of water is good.Application of the above-mentioned processing equipment in Treatment of Cyanide-containing Wastewater, effectively improve except cyanogen efficiency, except the filter after cyanogen
Total cyanogen clearance reaches more than 95% in liquid.The processing method of cyanide wastewater provided by the invention, it is effectively improved except cyanogen efficiency,
Except total cyanogen clearance reaches more than 95% in the filtrate after cyanogen.
Embodiments described above is part of the embodiment of the present invention, rather than whole embodiments.The reality of the present invention
The detailed description for applying example is not intended to limit the scope of claimed invention, but is merely representative of the selected implementation of the present invention
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
Every other embodiment, belongs to the scope of protection of the invention.
Claims (10)
- A kind of 1. processing equipment of cyanide wastewater, it is characterised in that including hydrophobic hollow fiber film and housing, the housing With cavity, the hydrophobic hollow fiber film be connected with the housing and by the cavity be divided into for hold alkali lye first Cavity and the second cavity for holding cyanide wastewater.
- 2. processing equipment according to claim 1, it is characterised in that the housing is cylinder, and the hydrophobicity is hollow Tunica fibrosa surrounds the hydrophobic hollow fiber membrane tube of tubulose, and the inwall of the hydrophobic hollow fiber membrane tube surrounds second sky Chamber, outer wall and the housing of the hydrophobic hollow fiber membrane tube surround first cavity.
- 3. processing equipment according to claim 1, it is characterised in that the housing is cylinder, and the hydrophobicity is hollow Tunica fibrosa laterally sets the cavity being divided into the first cavity and the second cavity.
- 4. application of the processing equipment as described in claims 1 to 3 any one in Treatment of Cyanide-containing Wastewater.
- A kind of 5. processing method of cyanide wastewater, it is characterised in that including：After cyanide wastewater acidification, filtering, filtrate is obtained；Second cavity that the filtrate is added in the processing equipment described in claims 1 to 3 any one, by the alkali Liquid adds first cavity, pushes away draught head of the free Cyanide in the both sides of the hydrophobic hollow fiber film in the filtrate It is dynamic lower by the hydrophobic hollow fiber membrane diffusion to the alkali lye.
- 6. according to the method for claim 5, it is characterised in that the alkali lye is NaOH solution or KOH solution；Preferably, The concentration of the NaOH solution is 5~10wt%.
- 7. according to the method for claim 5, it is characterised in that the pH value of the cyanide wastewater after acidification is 1.5 ~2.5；Preferably, the cyanide wastewater carries out acidification using sulfuric acid.
- 8. according to the method for claim 5, it is characterised in that the particle diameter of the particulate matter in filtrate after filtering be less than 21um。
- 9. according to the method for claim 5, it is characterised in that also include：The solution in the first cavity after collection processing, Separation of solid and liquid after crystallization；Preferably, crystallize to freeze 1.5~2h at 0~-1 DEG C.
- 10. according to the method for claim 9, it is characterised in that carried out in crystallization process with 100~150r/min speed Stirring；Preferably, the treatment fluid obtained after separation of solid and liquid is added into first cavity.
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