CN110294546A - A kind of brown oxide waste liquid processing method - Google Patents
A kind of brown oxide waste liquid processing method Download PDFInfo
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- CN110294546A CN110294546A CN201910374972.XA CN201910374972A CN110294546A CN 110294546 A CN110294546 A CN 110294546A CN 201910374972 A CN201910374972 A CN 201910374972A CN 110294546 A CN110294546 A CN 110294546A
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F2101/20—Heavy metals or heavy metal compounds
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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
- C02F2101/30—Organic compounds
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- Environmental & Geological Engineering (AREA)
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
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Abstract
The invention discloses a kind of brown oxide waste liquid processing methods, belong to technical field of waste water processing.The brown oxide waste liquid processing method the following steps are included: firstly, first alkaline matter is added into brown oxide waste liquid, make the pH value 6-8 of brown oxide waste liquid, and be stirred, the silane in brown oxide waste liquid allowed to be fully hydrolyzed；Then, continue to add alkaline matter into brown oxide waste liquid, so that the pH value of brown oxide waste liquid is greater than 8.5, and be stirred, generate sediment；Then, flocculant being added into brown oxide waste liquid and then flocculation aid, stratification being filtered, obtain filter residue and filtrate, the processing to brown oxide waste liquid can be completed.The present invention passes through the above method, not only the silane group in brown oxide waste liquid can be made to be fully hydrolyzed, copper ion is set to precipitate completely, but also imidazole group and copper ion can be made to form chelating object not soluble in water, so as to significantly reduce the copper ion concentration and COD concentration in brown oxide waste liquid, to reach the requirement of discharge standard.
Description
Technical field
The present invention relates to technical field of waste water processing, specifically a kind of brown oxide waste liquid processing method.
Background technique
Printed wiring board (Printed Circuit Board, PCB), belongs to electronic equipment manufacturing industry, is that guarantee is various
The platform of electronic component formation electric interconnection.The polymeric substrate that PCB is used can be glass-fiber-fabric enhancing epoxy resin or
The polymer such as phenol, polyamide, and brownification liquid is the processing for improving PCB multilayer printed circuit internal layer copper and polymeric material bonding
Liquid can be improved the binding force between multi-layer board.In addition, not only can be improved viscous by being handled with brownification liquid PCB
The specific surface area of junction, and one layer of organic metal conversion film can also be formed, to prevent copper to be further corroded, protect copper wire
Acid resistance is improved, to ensure that the quality and performance of PCB multilayer board in road.
However, brownification liquid is in pcb board production process, when using certain degree, due to being unable to satisfy the production of PCB
Technical requirements, therefore need to prepare brownification liquid again, at this point, brown oxide waste liquid will be generated.Wherein, the copper content in brown oxide waste liquid
Generally at (2.0-2.6) × 104Between mg/L, COD (Chemical Oxygen Demand, COD) is generally in (5-
6)×104Between mg/L.For common Sewage Disposal, it is not subject to the excessively high waste liquid of copper ion concentration, institute
Just can be carried out discharge after brown oxide waste liquid needs to reduce copper ion concentration in brown oxide waste liquid.
In the prior art, for example a kind of brownification liquid COD treatment process disclosed in Chinese patent CN109179803A,
A kind of brownification liquid processing side disclosed in a kind of brown oxide waste liquid treatment process and CN102603102B disclosed in CN105502760A
Method etc., although the copper ion in brown oxide waste liquid can be removed by the method for electrolysis, due to generating in pcb board production process
Brown oxide waste liquid in copper ion concentration it is higher, if being used directly to cathode copper, be not easy to be electrolysed, and there is also energy consumptions
The problems such as high and copper ion removal rate is lower.
Summary of the invention
The purpose of the present invention is to provide a kind of brown oxide waste liquid processing methods, to solve mentioned above in the background art ask
Topic.
To achieve the above object, the embodiment of the present invention provides the following technical solutions:
A kind of brown oxide waste liquid processing method, comprising the following steps:
(1) alkaline matter is added into brown oxide waste liquid, makes the pH value 6-8 of brown oxide waste liquid, and is stirred, and makes brownification useless
Silane in liquid is fully hydrolyzed；
(2) continue to add alkaline matter into brown oxide waste liquid, so that the pH value of brown oxide waste liquid is greater than 8.5, and be stirred, it is raw
At sediment；
(3) then flocculant and flocculation aid, stratification is added into brown oxide waste liquid then to be filtered, obtain filter residue and
Filtrate.
In the step (1), alkalinity is being added into brown oxide waste liquid for a kind of preferred embodiment used in the embodiment of the present invention
Before substance, ferrous sulfate is first added into brown oxide waste liquid.
Another kind preferred embodiment used in the embodiment of the present invention, in the step (1), the time of stirring is 30-
120min。
Another kind preferred embodiment used in the embodiment of the present invention, in the step (2), the time of stirring is 30-
120min。
Another kind preferred embodiment used in the embodiment of the present invention, in the step (1) and step (2), alkaline matter is
One of sodium hydroxide, white lime, potassium carbonate and sodium carbonate.
Another kind preferred embodiment used in the embodiment of the present invention, in the step (3), the additive amount of flocculant is 100-
150ppm。
Another kind preferred embodiment used in the embodiment of the present invention, the flocculant are organic flocculant.
Another kind preferred embodiment used in the embodiment of the present invention, the flocculant are poly dimethyl allyl chlorination
One of ammonium, polyvinylamine, xanthan gum, guar gum and sodium carboxymethylcellulose.
Another kind preferred embodiment used in the embodiment of the present invention, in the step (3), the additive amount of flocculation aid is 4-
15ppm。
Another kind preferred embodiment used in the embodiment of the present invention, the flocculation aid are polyacrylamide, starch-acryloyl
One of amine graft copolymer and polyethylene glycol oxide.
Compared with prior art, the beneficial effect of the embodiment of the present invention is:
(1) brown oxide waste liquid processing method provided in an embodiment of the present invention, treatment process is simple, processing cost is low, and handles
Significant effect.Wherein, the embodiment of the present invention is first promoted the pH value of brown oxide waste liquid to 6-8 by addition alkaline matter, and is stablized
For a period of time, the silane group in brown oxide waste liquid can be made to be fully hydrolyzed, making it no longer is the reproducibility group of long-chain, so as to
To significantly reduce the COD concentration in brown oxide waste liquid.
(2) embodiment of the present invention is also by after silane is fully hydrolyzed, continuing to add alkaline matter for the pH of brown oxide waste liquid
Value is promoted to 8.5 or more, and stable a period of time again, under copper ion and zinc ion in brown oxide waste liquid can be made to precipitate completely
Come, while imidazole group can also be made to react under alkaline condition with copper ion, forms chelating object not soluble in water, thus
The copper ion concentration in brown oxide waste liquid can be significantly reduced and the COD concentration in brown oxide waste liquid can be further decreased,
To be satisfied with the discharge standard requirement of " CJ343-2010 sewage is discharged into town sewer water standard ".
(3) embodiment of the present invention can also add a small amount of sulfuric acid by before adding alkaline matter in brown oxide waste liquid
Ferrous iron, so as to be destroyed under acidic conditions to the complex copper in brown oxide waste liquid by ferrous sulfate, so as to
Further increase the removal rate of copper ion.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
It should be noted that equipment and instrument and reagent appeared in following each embodiments, if not otherwise specified
It is using this field is conventional or commercially available equipment and instrument and reagent.In addition, the brown oxide waste liquid in following each embodiments is from more
A circuit board plant.
Embodiment 1
This embodiment offers a kind of brown oxide waste liquid processing methods comprising following steps:
(1) sodium hydroxide that mass concentration is 40% is added into 1000ml brown oxide waste liquid, until the pH value of brown oxide waste liquid
Stablize and be stirred 60min 7.0, and according to the mixing speed of 120rpm, the silane in brown oxide waste liquid is allowed to be fully hydrolyzed, and
It can sufficiently react and neutralize various inorganic acids and organic acid；Specific chemical reaction process is as follows:
H2SO4+2NaOH→Na2SO4+2H2O,
HNO3+NaOH→NaNO3+H2O,
H3PO4+3NaOH→Na3PO4+3H2O,
CH3COOH+NaOH→CH3COONa+H2O,
C6H8O7+NaOH→C6H7O7Na+H2O,
C2H4O3+NaOH→C2H3O3Na+H2O,
CH4O3S+NaOH→CH3O3SNa+H2O；
In addition, silane exists usually in the form of hydrolysis in neutral aqueous solution, specific chemical reaction process is as follows:
Si(OHR)3+3H2O→Si(OH)3+ 3ROH,
SiOH+NaOH→SiONa+H2O；
(2) during above-mentioned stirring, continue to add the sodium hydroxide that mass concentration is 40% into brown oxide waste liquid, directly
PH value to brown oxide waste liquid rises to stabilization after 9.0, is stirred 60min according still further to the mixing speed of 120rpm, makes brownification
Copper ion and zinc ion in waste liquid precipitate completely, generate sediment；Specific chemical reaction process is as follows:
CuSO4+2NaOH→Cu(OH)2↓+Na2SO4,
ZnSO4+2NaOH→Zn(OH)2↓+Na2SO4,
Zn(NO3)2+2NaOH→Zn(OH)2↓+2NaNO3,
Zn3(PO4)2+6NaOH→3Zn(OH)2↓+2Na3PO4,
(CH3COO)2Zn+NaOH→Zn(OH)2↓+2CH3COONa,
Zn(CF3SO3)2+2NaOH→Zn(OH)2↓+2NaCF3SO3；
In addition, imidazole radicals (1,3 diaza, penta ring) in alkaline medium, can make to remove one or several nitrogen originals on imidazoles
Son, and be directly connected with hydrogen atom, remaining part can enable imidazole radicals that a variety of interference chemical reactions occur；Due to imidazole radicals
Coordination nitrogen has coordination to metal ion, can form chelating object, and the solubility of the chelating object is minimum, the property hair of compound
Change has been given birth to, has no longer been the organic matter of reproducibility.Similarly, the reproducibility imidazoles in brown oxide waste liquid and their derivative are exhausted
It is most of that more stable chelate can also be formed in alkaline medium.So by above-mentioned useless to brownification with sodium hydroxide
The pH of liquid makees further to adjust, and not only copper ion and zinc ion can be made to precipitate, but also can make in brown oxide waste liquid
Reductive organic matter is destroyed, and forms compound not soluble in water, so as to reduce the COD concentration in brown oxide waste liquid.
(3) then, flocculant is added into the brown oxide waste liquid that generation has sediment and then flocculation aid, stratification are used
Plate and frame type filter-press is filtered, and is made to be separated by solid-liquid separation, is obtained filter residue and filtrate.Wherein, flocculant is organic flocculant, specifically
Polydimethyl diallyl ammonium chloride, additive amount 120ppm can be selected；Polyacrylamide can be selected in flocculation aid, addition
Amount is 4ppm；Certainly, according to the yield of practical sediment, other flocculants also may be selected and flocculation aid is used cooperatively.
Heavy copper process due to the precipitation reaction process in above-mentioned steps (2) than common metal waste water, generated heavy copper sludge quantity are wanted
More, if be used cooperatively using flocculation aids such as inorganic flocculating agents and polyacrylamide such as conventional aluminium polychlorides
It talks about, mud-water separation speed is slow after coagulating sedimentation and the residence time is longer, therefore is unsuitable for the treatment process.In contrast, lead to
It crosses and is cooperated using the flocculation aids such as polydimethyl diallyl ammonium chloride and polyacrylamide, cohesiveness is strong, hydrolysis-stable
Property is good, and not at gel, therefore can rapidly make to be separated by solid-liquid separation, so as to improve the treatment effect and efficiency of brown oxide waste liquid.
In addition, the filtrate that the step obtains meets " CJ343-2010 sewage is discharged into town sewer water standard ", thus can directly into
Row discharge, copper can be extracted by way of copper smelting by pyrometallurgy in the prior art by obtaining filter residue.
Embodiment 2
This embodiment offers a kind of brown oxide waste liquid processing methods comprising following steps:
(1) sodium hydroxide that mass concentration is 40% is added into 1000ml brown oxide waste liquid, until the pH value of brown oxide waste liquid
Stablize and be stirred 60min 6.5, and according to the mixing speed of 120rpm, the silane in brown oxide waste liquid is allowed to be fully hydrolyzed, and
It can sufficiently react and neutralize various inorganic acids and organic acid.
(2) during above-mentioned stirring, continue to add the sodium hydroxide that mass concentration is 40% into brown oxide waste liquid, directly
PH value to brown oxide waste liquid rises to stabilization after 9.6, is stirred 60min according still further to the mixing speed of 120rpm, makes brownification
Copper ion and zinc ion in waste liquid precipitate completely, generate sediment.
(3) then, flocculant is added into the brown oxide waste liquid that generation has sediment and then flocculation aid, stratification are used
Plate and frame type filter-press is filtered, and is made to be separated by solid-liquid separation, is obtained filter residue and filtrate.Wherein, flocculant is organic flocculant, specifically
Polydimethyl diallyl ammonium chloride, additive amount 120ppm can be selected；Polyacrylamide can be selected in flocculation aid, addition
Amount is 4ppm.The filtrate that the step obtains meets " CJ343-2010 sewage is discharged into town sewer water standard ", therefore can be straight
Capable discharge is tapped into, copper can be extracted by way of copper smelting by pyrometallurgy in the prior art by obtaining filter residue.
Embodiment 3
This embodiment offers a kind of brown oxide waste liquid processing methods comprising following steps:
(1) add white lime into 1000ml brown oxide waste liquid, until brown oxide waste liquid pH stable 7.0, and according to
The mixing speed of 120rpm is stirred 60min, and the silane in brown oxide waste liquid is allowed to be fully hydrolyzed, and can sufficiently react neutralization
Various inorganic acids and organic acid.
(2) during above-mentioned stirring, continue to add white lime into brown oxide waste liquid, until in the pH value of brown oxide waste liquid
It is raised to and stablizes after 9.6, be stirred 60min according still further to the mixing speed of 120rpm, make copper ion and zinc in brown oxide waste liquid
Ion precipitates completely, generates sediment.
(3) then, flocculant is added into the brown oxide waste liquid that generation has sediment and then flocculation aid, stratification are used
Plate and frame type filter-press is filtered, and is made to be separated by solid-liquid separation, is obtained filter residue and filtrate.Wherein, flocculant is organic flocculant, specifically
Polydimethyl diallyl ammonium chloride, additive amount 120ppm can be selected；Polyacrylamide can be selected in flocculation aid, addition
Amount is 4ppm.The filtrate that the step obtains meets " CJ343-2010 sewage is discharged into town sewer water standard ", therefore can be straight
Capable discharge is tapped into, copper can be extracted by way of copper smelting by pyrometallurgy in the prior art by obtaining filter residue.
Embodiment 4
This embodiment offers a kind of brown oxide waste liquid processing methods comprising following steps:
(1) add sodium hydroxide into 1000ml brown oxide waste liquid, until brown oxide waste liquid pH stable 6.5, and according to
The mixing speed of 120rpm is stirred 90min, and the silane in brown oxide waste liquid is allowed to be fully hydrolyzed, and can sufficiently react neutralization
Various inorganic acids and organic acid.
(2) during above-mentioned stirring, continue to add sodium hydroxide into brown oxide waste liquid, until the pH value of brown oxide waste liquid
Rise to and stablize after 9.5, be stirred 60min according still further to the mixing speed of 120rpm, make copper ion in brown oxide waste liquid and
Zinc ion precipitates completely, generates sediment.
(3) then, flocculant is added into the brown oxide waste liquid that generation has sediment and then flocculation aid, stratification are used
Plate and frame type filter-press is filtered, and is made to be separated by solid-liquid separation, is obtained filter residue and filtrate.Wherein, flocculant is organic flocculant, specifically
Polyvinylamine, additive amount 100ppm can be selected；Polyacrylamide, additive amount 15ppm can be selected in flocculation aid.The step
Suddenly the filtrate obtained meets " CJ343-2010 sewage is discharged into town sewer water standard ", therefore can directly be discharged, and obtains
Copper can be extracted by way of copper smelting by pyrometallurgy in the prior art to filter residue.
Embodiment 5
This embodiment offers a kind of brown oxide waste liquid processing methods comprising following steps:
(1) 5g ferrous sulfate is first added into 1000ml brown oxide waste liquid, and the complex copper in brown oxide waste liquid is abolished；It connects
, the sodium hydroxide that mass concentration is 40% is added into brown oxide waste liquid, until the pH stable of brown oxide waste liquid and is pressed 7.0
It is stirred 60min according to the mixing speed of 120rpm, the silane in brown oxide waste liquid is allowed to be fully hydrolyzed, and can sufficiently be reacted
With various inorganic acids and organic acid.It should be noted that since ferrous sulfate only in acid condition just can be to complex copper
It is destroyed, therefore it is necessary to first add ferrous sulfate before adding alkaline matter.
(2) during above-mentioned stirring, continue to add the sodium hydroxide that mass concentration is 40% into brown oxide waste liquid, directly
PH value to brown oxide waste liquid rises to stabilization after 9.0, is stirred 60min according still further to the mixing speed of 120rpm, makes brownification
Copper ion and zinc ion in waste liquid precipitate completely, generate sediment.
(3) then, flocculant is added into the brown oxide waste liquid that generation has sediment and then flocculation aid, stratification are used
Plate and frame type filter-press is filtered, and is made to be separated by solid-liquid separation, is obtained filter residue and filtrate.Wherein, flocculant is organic flocculant, specifically
Xanthan gum, additive amount 120ppm can be selected；Polyacrylamide, additive amount 4ppm can be selected in flocculation aid.The step
Obtained filtrate meets " CJ343-2010 sewage is discharged into town sewer water standard ", therefore can directly be discharged, and obtains
Filter residue can extract copper by way of copper smelting by pyrometallurgy in the prior art.
Embodiment 6
This embodiment offers a kind of brown oxide waste liquid processing methods comprising following steps:
(1) add potassium carbonate into 1000ml brown oxide waste liquid, until brown oxide waste liquid pH stable 6.0, and according to
The mixing speed of 120rpm is stirred 30min, and the silane in brown oxide waste liquid is allowed to be fully hydrolyzed, and can sufficiently react neutralization
Various inorganic acids and organic acid.
(2) during above-mentioned stirring, continue to add potassium carbonate into brown oxide waste liquid, until in the pH value of brown oxide waste liquid
It is raised to and stablizes after 8.5, be stirred 30min according still further to the mixing speed of 120rpm, make copper ion and zinc in brown oxide waste liquid
Ion precipitates completely, generates sediment.
(3) then, flocculant is added into the brown oxide waste liquid that generation has sediment and then flocculation aid, stratification are used
Plate and frame type filter-press is filtered, and is made to be separated by solid-liquid separation, is obtained filter residue and filtrate.Wherein, flocculant is organic flocculant, specifically
Guar gum, additive amount 120ppm can be selected；Starch-acrylamide grafted copolymer, additive amount can be selected in flocculation aid
For 4ppm.The filtrate that the step obtains meets " CJ343-2010 sewage is discharged into town sewer water standard ", therefore can be direct
It is discharged, copper can be extracted by way of copper smelting by pyrometallurgy in the prior art by obtaining filter residue.
Embodiment 7
This embodiment offers a kind of brown oxide waste liquid processing methods comprising following steps:
(1) it is sodium carbonate that mass concentration is added into 1000ml brown oxide waste liquid, until the pH stable of brown oxide waste liquid exists
8.0, and be stirred 120min according to the mixing speed of 120rpm, allow the silane in brown oxide waste liquid to be fully hydrolyzed, and can be with
Sufficiently reaction neutralizes various inorganic acids and organic acid.
(2) during above-mentioned stirring, continue to add sodium carbonate into brown oxide waste liquid, until in the pH value of brown oxide waste liquid
It is raised to and stablizes after 9.0, be stirred 120min according still further to the mixing speed of 120rpm, make copper ion and zinc in brown oxide waste liquid
Ion precipitates completely, generates sediment.
(3) then, flocculant is added into the brown oxide waste liquid that generation has sediment and then flocculation aid, stratification are used
Plate and frame type filter-press is filtered, and is made to be separated by solid-liquid separation, is obtained filter residue and filtrate.Wherein, flocculant is organic flocculant, specifically
Sodium carboxymethylcellulose, additive amount 150ppm can be selected；Polyethylene glycol oxide can be selected in flocculation aid, and additive amount is
15ppm.The filtrate that the step obtains meets " CJ343-2010 sewage is discharged into town sewer water standard ", thus can directly into
Row discharge, copper can be extracted by way of copper smelting by pyrometallurgy in the prior art by obtaining filter residue.
It is dense that COD is carried out respectively to the filtrate obtained after untreated brown oxide waste liquid in above-described embodiment 1-5 and processing
The detection of degree and copper ion concentration, (wherein, the detection method of COD concentration is in the prior art fast to testing result such as following table
The closed Catalytic digestion method of speed, the detection method of copper ion concentration are cupral extraction spectrophotometric method):
It, can be with from upper table it is recognised that being handled using processing method provided in an embodiment of the present invention brown oxide waste liquid
Significantly reduce brown oxide waste liquid in COD concentration and reduce brown oxide waste liquid in copper ion concentration, so as to so that treated palm fibre
Change the discharge standard requirement that waste liquid meets " CJ343-2010 sewage is discharged into town sewer water standard ".Wherein, the present invention mentions
The embodiment 2-5 of confession, by first promoting the pH of brown oxide waste liquid to 6.5-7.0, after a period of stabilisation, then by brown oxide waste liquid
PH is promoted to 9 or more, then after a period of stabilisation, COD concentration is less than 500mg/L, copper in the brown oxide waste liquid that can make that treated
Ion concentration is less than 2mg/L.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (10)
1. a kind of brown oxide waste liquid processing method, which comprises the following steps:
(1) alkaline matter is added into brown oxide waste liquid, makes the pH value 6-8 of brown oxide waste liquid, and is stirred, and is allowed in brown oxide waste liquid
Silane be fully hydrolyzed；
(2) continue to add alkaline matter into brown oxide waste liquid, so that the pH value of brown oxide waste liquid is greater than 8.5, and be stirred, it is heavy to generate
Starch；
(3) flocculant then is added into brown oxide waste liquid and then flocculation aid, stratification are filtered, obtain filter residue and filtrate.
2. a kind of brown oxide waste liquid processing method according to claim 1, which is characterized in that in the step (1), past
Before adding alkaline matter in brown oxide waste liquid, ferrous sulfate is first added into brown oxide waste liquid.
3. a kind of brown oxide waste liquid processing method according to claim 1, which is characterized in that in the step (1), stirring
Time be 30-120min.
4. a kind of brown oxide waste liquid processing method according to claim 1, which is characterized in that in the step (2), stirring
Time be 30-120min.
5. a kind of brown oxide waste liquid processing method according to claim 1, which is characterized in that the step (1) and step
(2) in, alkaline matter is one of sodium hydroxide, white lime, potassium carbonate and sodium carbonate.
6. a kind of brown oxide waste liquid processing method according to claim 1, which is characterized in that in the step (3), flocculation
The additive amount of agent is 100-150ppm.
7. a kind of brown oxide waste liquid processing method according to claim 6, which is characterized in that the flocculant is organic wadding
Solidifying agent.
8. a kind of brown oxide waste liquid processing method according to claim 7, which is characterized in that the flocculant is poly- diformazan
One of base diallyl ammonium chloride, polyvinylamine, xanthan gum, guar gum and sodium carboxymethylcellulose.
9. a kind of brown oxide waste liquid processing method according to claim 1, which is characterized in that in the step (3), help solidifying
The additive amount of agent is 4-15ppm.
10. a kind of brown oxide waste liquid processing method according to claim 9, which is characterized in that the flocculation aid is poly- third
One of acrylamide, starch-acrylamide grafted copolymer and polyethylene glycol oxide.
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