CN106045123B - A kind of recycling and zero discharge recovery process method of chemical nickel waste liquid - Google Patents
A kind of recycling and zero discharge recovery process method of chemical nickel waste liquid Download PDFInfo
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- CN106045123B CN106045123B CN201610559755.4A CN201610559755A CN106045123B CN 106045123 B CN106045123 B CN 106045123B CN 201610559755 A CN201610559755 A CN 201610559755A CN 106045123 B CN106045123 B CN 106045123B
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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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- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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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
- C02F1/26—Treatment of water, waste water, or sewage by extraction
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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
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
Abstract
A kind of recycling and zero discharge recovery process method of chemical nickel waste liquid, it is characterised in that: comprise the steps of: the first step is concentrated and separated chemical nickel waste liquid: the pH value of the chemical nickel waste liquid is adjusted to 3 ~ 5；Low-temperature negative-pressure evaporation and concentration is carried out again, and heating temperature is 95 ~ 110 DEG C, and condition of negative pressure is -0.09~-0.1 MPa, guarantees that boiling temperature is no more than 70 DEG C；The molten separating sodium sulfate of acid: chemical nickel residue is carried out slowly impregnating dissolution under constant stirring with sulfuric acid solution, obtains sulphuric leachate by second step；It after being fully cooled, is filtered, obtains filtrate and sodium sulfate crystal；Third step, extraction and separation nickel sulfate: ethyl alcohol being added into filtrate, is layered after standing, is separated by solid-liquid separation and obtains nickel sulfate solid for resource utilization utilization；4th step recycles ethyl alcohol.The present invention accomplishes whole recycling of chemical nickel solid waste from technique, is truly realized the recycling of waste liquid, the environmental requirement of zero-emission, greatly reduces required social environment capacity.
Description
Technical field
The present invention relates to the recycling recovery process of chemical nickel waste liquid more particularly to a kind of recyclings zero of chemical nickel waste liquid
Drain back into process of knocking off.
Background technique
Nickel chemical plating technology technology is uniform with its chemical deposit, hardness is high, anti-corrosion, wear-resisting property is good, coated parts not by
The advantages that size shape limitation and special magnetic performance, is in each industrial circle application especially route board industry and plating row
Industry using relatively broad.But with chemical plating nickel technology application range and production-scale continuous expansion, the environment of generation is asked
It inscribes also increasingly severe.
In the actual production process, redox reaction occurs in coating bath, i.e. nickel ion is reduced into metallic nickel, hypophosphorous acid
Root is oxidized into orthophosphite.With the progress of chemical plating, nickel ion and hypophosphorous acid root are gradually used up, by-product orthophosphite
Constantly accumulation, plating speed is significant slack-off, and coating hole increases, and can generate phosphorous acid nickel precipitating, causes plating solution to fail, chemical nickel
Thus Ageing solution generates；Coating bath carries out foam washing with concentrated nitric acid again, generates nitric acid and cleans waste liquid.Pollutant concentration in both waste liquids
Higher, danger coefficient is larger, and processing difficulty is also big.
Chemical precipitation method, ion-exchange, electroosmose process, electrolysis are mainly used to such process for treating waste liquor at this stage
Method, adsorbent material method and biology and the comprehensive of them use.Since concentration is higher, waste liquid must be added dropwise to low concentration in batches
Waste water in, in the process, not only consumed a large amount of chemical agent, but also produce secondary pollution, generated nickel-containing sludge
Non-recovery is worth solid waste again, and final process result is difficult to accomplish qualified discharge.
Enterprise is all made of the outer mode disposed of committee and shifts waste liquid at present, and qualified enterprise is entrusted to carry out waste liquid
Processing.Since technical requirements are higher, various aspects cost goes up, along with the increasingly reduction of social environment capacity, to disposition
The enterprise qualification of such waste liquid increasingly standardizes, and when the river rises the boat goes up therewith for processing cost, this just greatly increase the liquid waste processing of enterprise at
This, causes burden.
Summary of the invention
The object of the present invention is to provide a kind of recycling and zero discharge recovery process method of chemical nickel waste liquid, the processes
On the one hand it is that enterprise solves chemical nickel liquid waste processing problem, reduces the treatment cost of waste liquor of enterprise, be on the other hand intended to prevent
Chemical nickel effluent resource zero-emission is recycled, provides space for social environment capacity by secondary pollution.
To achieve the above object of the invention, the technical solution adopted by the present invention is that: a kind of recycling zero-emission of chemical nickel waste liquid
Put back to process of knocking off, it is characterised in that: the recycling and zero discharge recovery process method comprises the steps of:
The first step is concentrated and separated chemical nickel waste liquid:
The pH value of the chemical nickel waste liquid is adjusted to 3 ~ 5, so that the ammonia nitrogen in chemical nickel waste liquid is deposited in the form of ammonium salt
?；Then the chemical nickel waste liquid for adjusting pH value being subjected to low-temperature negative-pressure evaporation and concentration again, extraneous heating temperature is 95 ~ 110 DEG C,
Condition of negative pressure is -0.09~-0.1 MPa, guarantees that the boiling temperature of chemical nickel waste liquid is no more than 70 DEG C when heat supply, when chemical nickel is useless
When the volume of liquid is the 8 ~ 12% of original volume, stops evaporation, obtain chemical nickel residue, the vapor evaporated is through condensing heel row
Out；
Second step, the molten separating sodium sulfate of acid:
The chemical nickel residue is carried out under constant stirring with sulfuric acid solution slowly to impregnate dissolution, so that the chemistry
Nickel residue all dissolves, and obtains sulphuric leachate, wherein added sulfuric acid solution amount is just that all chemical nickel residues is complete
Subject to portion's dissolution；It after being fully cooled, is filtered, obtains filtrate and white crystal, this white crystal is crude sulfuric acid
Sodium crystal；
Third step, extraction and separation nickel sulfate:
Ethyl alcohol is added into the filtrate of the second step, the ethyl alcohol of addition and the volume ratio of filtrate are 1:0.9 ~ 1.1,
It mixes well, solution becomes cloudy, and after standing, layering, upper organic phase is colorless and transparent filtrate, i.e., containing the ethyl alcohol of ortho phosphorous acid
Solution, lower layer's solid phase are green solid, i.e. nickel sulfate solid, are separated by solid-liquid separation to obtain through phase-splitter and described contain ortho phosphorous acid
Ethanol solution and nickel sulfate solid, nickel sulfate solid for resource utilization utilize；
4th step recycles ethyl alcohol:
The ethanol solution containing ortho phosphorous acid of the third step is separated by low-temperature evaporation, obtained ethyl alcohol can return
It is back in the third step and reuses, resulting raffinate is ortho phosphorous acid after evaporation.
Related content in above-mentioned technical proposal is explained as follows:
1, in above scheme, in the second step, the chemical nickel residue is heated when sulfuric acid solution is added, is added
Hot temperature is 50 ~ 100 DEG C.
2, in above scheme, in the second step, the mass concentration of added sulfuric acid solution is 45 ~ 55%.
3, in above scheme, in the second step, cooling temperature is 0~5 DEG C, and cooling temperature is lower, the crystal of precipitation
More, separating effect is also better.
4, in above scheme, in the third step, the volumetric concentration of the ethyl alcohol of addition is 95% or more.
5, in above scheme, the crude sodium sulfate crystal in the second step can be used as sodium sulphate purification recycling or its
His industrial chemicals.
6, in above scheme, the ortho phosphorous acid in the 4th step can recycle the original that can also be used as chemical industry production of phosphate fertilizer
Material.
Design feature of the invention is: the chemical nickel waste liquid of generation is by the aging waste liquid of chemical nickel coating bath and the nitric acid of washing trough
Waste liquid composition, main component are nickel sulfate, sodium hypophosphite, nitric acid, ammonium salt, organic acid etc..In order to allow enterprise to reduce environmental protection
Processing cost is separated by solid-liquid separation chemical nickel waste liquid first from the angle of decrement, and it is dense to be thusly-formed chemical nickel waste liquid
Contracting technique, the concentrated separation of waste liquid form two parts later: a part is water, and another part is chemical nickel residue.The residue is
Green glue solid, such colloidal solid main component are nickel sulfate, sodium sulphate, ortho phosphorous acid, sodium nitrate and a small amount of its
His impurity, wherein the content of nickel is 4 ~ 5%, there is a Gao Zheke to 10% or more, before nickel content is about the concentration of chemical nickel waste liquid stoste
Ten times, with resource recycling be worth.
The method that general counterweight metal solid waste all uses high-temperature roasting and Ore Leaching process integration, heavy metal is carried out
Recycling, but containing the ortho phosphorous acid of more amount in the solid waste, when heating temperature is more than 130 DEG C, ortho phosphorous acid is then decomposed
At orthophosphoric acid and hydrogen phosphide, hydrogen phosphide is extremely toxic substance, and the method will form secondary pollution and there are high risks；In addition, secondary
Phosphorous acid is also dissolved into acid therewith during Ore Leaching, does not reach separating effect, and nickel can not recycle.The solid waste is long
It postpones and easily deliquesces and soften, form waste liquid, such as place accidentally, heavy metal easily infiltrates into soil and water, serious polluted surface water
And underground water, surrounding enviroment are endangered, human health is damaged.
Therefore, in this set process program, for solid waste described above, be designed as again carrying out this residue acid it is molten,
Main chemical compositions in residue are carried out whole recycling by the means such as extraction and separation.This recycling recovery process both solves enterprise
Trouble and worry thoroughly solves environmental issue for enterprise, and compensates for insoluble to such solid in process at this stage
The resource reclaim and problem of environmental pollution of waste.
(1) the solution of the present invention is concentrated chemical nickel waste liquid to isolate most moisture first, evaporates
Gas becomes condensed water after condenser condenses and enters exhaust system, mainly different using the boiling point of each substance, according to adjusting pH
To control the amount of ammonia nitrogen in condensed water, the amount of low-temp low-pressure control condensed water COD, because nickel, phosphorus, nitrate anion substance of this kind are constituted
Chemical constituent relative boiling point it is higher, will not be evaporated under low-temp low-pressure, hereby it is ensured that the discharge quality of condensed water, dense
Condensed water can discharge after contracting, can also be used as the source of recycle-water, and the sticky gelatinous chemical nickel residue of gained then enters
Two steps.
In the first step, in order to which solid ammonia prevents from carrying a large amount of ammonia nitrogens in separated water, therefore before concentration must
Chemical adjustment must be carried out, is mainly reflected in the adjustment of pH value, one side ammonia nitrogen all exists with ammonium salts, will not be with concentration
The progress of separation process and evaporate, on the other hand also consider used in separation equipment service life, so taking faintly acid
Condition, that is, pH is adjusted to 3 ~ 5, and nitric acid washing trough waste liquid can be used to be adjusted for neutral and alkaline chemical nickel-plating waste liquid, without addition volume
Outer medicament.Negative pressure evaporation condition is used when being concentrated by evaporation, boiling temperature is controlled at 60 ~ 70 degrees Celsius, to guarantee nitrate nitrogen not
It can overflow.
(2) second step of the invention is mainly the principles of chemistry that weak acid is prepared using strong acid, and sodium sulphate does not dissolve in strong acid
Principle will be precipitated in sodium sulphate chemically nickel residue with strong acid dissolution chemical nickel residue, to isolate sodium sulphate, acid is molten
The reaction equation of precipitation are as follows:
2NaH2PO2 + H2SO4→Na2SO4↓+ 2H3PO2。
(3) third step of the invention and the 4th step after also separating sodium sulphate, are left nickel sulfate and ortho phosphorous acid, can
To be slightly soluble in ethyl alcohol using nickel sulfate, ortho phosphorous acid is soluble in this feature of ethyl alcohol and carries out extraction and recrystallization, to reach sulphur
Sour nickel and ortho phosphorous acid are separated.Good solvent ethyl alcohol used in the process of this can be recycled simultaneously again by the method for evaporation
Recycling.
Beneficial effects of the present invention:
(1) processing step involved in the present invention is simple, and there is no violent chemical reaction, operating safety factors
It is high.
(2) do not increase polluter additionally in technical process of the invention, also do not generate secondary pollution.
(2) main component in chemical nickel residue is effectively separated by the present invention, realizes recycling all recycling benefits
Technique purpose.
(3) solid matter caused by the present invention has economic value, can be used as the chemical raw material of Chemical Manufacture.
(4) sulfuric acid mainly relatively low using price in the present invention, cost is relatively low for dosing.
(5) present invention accomplishes whole recycling of pollutant from technique, is truly realized the recycling of waste liquid, the ring of zero-emission
Guaranteed request greatly reduces required social environment capacity, also solves the trouble and worry of enterprise.
(6) main component in solid waste is effectively separated by nickel recovery of the invention up to 97% or more, real
The technique purpose that recycling all recycles is showed.
(7) condensed water is substantially without phosphorus caused by the present invention, nickel, low COD, low nitrogen content, has reached the discharge of sewage three-level
Standard substantially reduces the pressure to environment.
Detailed description of the invention
Attached drawing 1 is process flow chart of the invention.
Specific embodiment
The present invention will be further described below with reference to examples:
A kind of embodiment 1: recycling and zero discharge recovery process method of chemical nickel waste liquid
The recycling and zero discharge recovery process method comprises the steps of:
The first step is concentrated and separated chemical nickel waste liquid:
The pH value of the chemical nickel waste liquid is adjusted to 3 ~ 5, so that the ammonia nitrogen in chemical nickel waste liquid is deposited in the form of ammonium salt
?；Then the chemical nickel waste liquid for adjusting pH value is subjected to low-temperature negative-pressure evaporation and concentration again, extraneous heating temperature is 100 DEG C, is born
Press strip part is -0.09MPa, guarantees that the boiling temperature of chemical nickel waste liquid is no more than 70 DEG C when heat supply, when the volume of chemical nickel waste liquid
For original volume 10% when, stop evaporation, obtain chemical nickel residue, the vapor evaporated become after condensing condensed water row
Out, the COD content of condensed water is no more than 200mg/L, and the ammonia-nitrogen content of condensed water is no more than 8mg/L；
Second step, the molten separating sodium sulfate of acid:
The chemical nickel residue is being stirred continuously and is carrying out slowly impregnating dissolution under heating condition with sulfuric acid solution, is being added
Hot temperature is 80 DEG C, and the mass concentration of added sulfuric acid solution is 50%, so that the chemical nickel residue all dissolves, obtains sulphur
Acid leaching liquor, wherein added sulfuric acid solution amount is just will be subject to all chemical nickel residues all dissolution；Wait be fully cooled
Afterwards, i.e., it is filtered when cooling temperature reaches 0~5 DEG C, obtains filtrate and white crystal, this white crystal is crude sulfuric acid
Sodium crystal can be used as sodium sulphate purification recycling or other industrial chemicals；
Third step, extraction and separation nickel sulfate:
Ethyl alcohol is added into the filtrate of the second step, the volumetric concentration of the ethyl alcohol of addition is 95% or more, addition
The volume ratio of ethyl alcohol and filtrate is 1:1, is mixed well, and solution becomes cloudy, and after standing, layering, upper organic phase is colorless and transparent
Filtrate, i.e., containing the ethanol solution of ortho phosphorous acid, lower layer's solid phase is green solid, i.e. nickel sulfate solid, is obtained through being separated by solid-liquid separation
The ethanol solution and nickel sulfate solid containing ortho phosphorous acid, nickel sulfate solid is utilized for resource utilization, through calculating, nickel
Element recovery rate reaches 98.7%；
4th step recycles ethyl alcohol:
The ethanol solution containing ortho phosphorous acid of the third step is separated by low-temperature evaporation, obtained ethyl alcohol can return
It is back in the third step and reuses, resulting raffinate is ortho phosphorous acid after evaporation, can recycle and can also be used as chemical industry phosphorus
The raw material of fertilizer production.
A kind of embodiment 2: recycling and zero discharge recovery process method of chemical nickel waste liquid
The recycling and zero discharge recovery process method comprises the steps of:
The first step is concentrated and separated chemical nickel waste liquid:
By the pH value of the chemical nickel waste liquid to 3 ~ 5, so that the ammonia nitrogen in chemical nickel waste liquid exists in the form of ammonium salt；So
The chemical nickel waste liquid for adjusting pH value is subjected to low-temperature negative-pressure evaporation and concentration again afterwards, extraneous heating temperature is 95 DEG C, condition of negative pressure
For -0.1MPa, when heat supply, guarantees that the boiling temperature of chemical nickel waste liquid is no more than 70 DEG C, when the volume of chemical nickel waste liquid is original body
When long-pending 12%, stop evaporation, obtain chemical nickel residue, the vapor evaporated becomes condensed water discharge, condensed water after condensing
COD content be no more than 200mg/L, the ammonia-nitrogen content of condensed water is no more than 10mg/L；
Second step, the molten separating sodium sulfate of acid:
The chemical nickel residue is being stirred continuously and is carrying out slowly impregnating dissolution under heating condition with sulfuric acid solution, is being added
Hot temperature is 50 DEG C, and the mass concentration of added sulfuric acid solution is 55%, so that the chemical nickel residue all dissolves, obtains sulphur
Acid leaching liquor, wherein added sulfuric acid solution amount is just will be subject to all chemical nickel residues all dissolution；Wait be fully cooled
Afterwards, i.e., it is filtered when cooling temperature reaches 0~5 DEG C, obtains filtrate and white crystal, this white crystal is crude sulfuric acid
Sodium crystal can be used as sodium sulphate purification recycling or other industrial chemicals；
Third step, extraction and separation nickel sulfate:
Ethyl alcohol is added into the filtrate of the second step, the volumetric concentration of the ethyl alcohol of addition is 95% or more, addition
The volume ratio of ethyl alcohol and filtrate is 1:1.1, is mixed well, and solution becomes cloudy, and after standing, layering, upper organic phase is colourless
Bright filtrate, i.e., containing the ethanol solution of ortho phosphorous acid, lower layer's solid phase is green solid, i.e. nickel sulfate solid, through being separated by solid-liquid separation
To the ethanol solution and nickel sulfate solid containing ortho phosphorous acid, nickel sulfate solid is utilized for resource utilization, through calculating,
The nickel element rate of recovery reaches 98.5%；
4th step recycles ethyl alcohol:
The ethanol solution containing ortho phosphorous acid of the third step is separated by low-temperature evaporation, obtained ethyl alcohol can return
It is back in the third step and reuses, resulting raffinate is ortho phosphorous acid after evaporation, can recycle and can also be used as chemical industry phosphorus
The raw material of fertilizer production.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of recycling and zero discharge recovery process method of chemical nickel waste liquid, it is characterised in that: the recycling and zero discharge returns
Process of knocking off comprises the steps of:
The first step is concentrated and separated chemical nickel waste liquid:
The pH value of the chemical nickel waste liquid is adjusted to 3 ~ 5, so that the ammonia nitrogen in chemical nickel waste liquid exists in the form of ammonium salt；So
The chemical nickel waste liquid for adjusting pH value is subjected to low-temperature negative-pressure evaporation and concentration again afterwards, extraneous heating temperature is 95 ~ 110 DEG C, negative pressure
Condition is -0.09~-0.1 MPa, guarantees that the boiling temperature of chemical nickel waste liquid is no more than 70 DEG C when heat supply, when chemical nickel waste liquid
When volume is the 8 ~ 12% of original volume, stops evaporation, obtain chemical nickel residue, the vapor evaporated is discharged after condensing；
Second step, the molten separating sodium sulfate of acid:
The chemical nickel residue is carried out under constant stirring with sulfuric acid solution slowly to impregnate dissolution, so that the chemical nickel is residual
Slag all dissolves, and obtains sulphuric leachate, wherein added sulfuric acid solution amount is just that all chemical nickel residues is all molten
Subject to solution；It after being fully cooled, is filtered, obtains filtrate and white crystal, this white crystal is that crude sodium sulphate is brilliant
Body；
Third step, extraction and separation nickel sulfate:
Ethyl alcohol is added into the filtrate of the second step, the ethyl alcohol of addition and the volume ratio of filtrate are 1:0.9 ~ 1.1, sufficiently
It mixes, solution becomes cloudy, and after standing, layering, upper organic phase is colorless and transparent filtrate, i.e. the ethyl alcohol containing ortho phosphorous acid is molten
Liquid, lower layer's solid phase are green solid, i.e. nickel sulfate solid, be separated by solid-liquid separation obtain the ethanol solution containing ortho phosphorous acid with
Nickel sulfate solid, nickel sulfate solid are utilized for resource utilization；
4th step recycles ethyl alcohol:
The ethanol solution containing ortho phosphorous acid of the third step is separated by low-temperature evaporation, obtained ethyl alcohol can be back to
It is reused in the third step, resulting raffinate is crude ortho phosphorous acid after evaporation.
2. a kind of recycling and zero discharge recovery process method of chemical nickel waste liquid according to claim 1, it is characterised in that:
In the second step, the chemical nickel residue is heated when sulfuric acid solution is added, heating temperature is 50 ~ 100 DEG C.
3. a kind of recycling and zero discharge recovery process method of chemical nickel waste liquid according to claim 1, it is characterised in that:
In the second step, the mass concentration of added sulfuric acid solution is 45 ~ 55%.
4. a kind of recycling and zero discharge recovery process method of chemical nickel waste liquid according to claim 1, it is characterised in that:
In the second step, cooling temperature is 0~5 DEG C.
5. a kind of recycling and zero discharge recovery process method of chemical nickel waste liquid according to claim 1, it is characterised in that:
In the third step, the volumetric concentration of the ethyl alcohol of addition is 95% or more.
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| CN106894047B (en) * | 2017-03-10 | 2019-01-22 | 傅楚闽 | A kind of environmental protection recycling method of nickel in chemical nickel-plating ageing liquid |
| CN107119311A (en) * | 2017-06-29 | 2017-09-01 | 昆山福仕电子材料工业有限公司 | The quick clean online plating solution negative pressure evaporation reuse method of electronickelling production line and equipment |
| CN109809614A (en) * | 2019-03-20 | 2019-05-28 | 包头昊明稀土新电源科技有限公司 | Water system green secondary cell wastewater zero emission treatment method and equipment |
| CN111333241A (en) * | 2020-03-10 | 2020-06-26 | 太仓市金鹿电镀有限公司 | Electroplating wastewater treatment method and working method thereof |
| CN111977732A (en) * | 2020-09-04 | 2020-11-24 | 黑龙江科霖环境咨询有限公司 | Low-temperature negative-pressure evaporation method for high-concentration online instrument waste liquid |
| CN113104914A (en) * | 2021-04-13 | 2021-07-13 | 深圳市环境工程科学技术中心有限公司 | Concentration and decrement treatment method for chemical nickel waste liquid |
| CN113860615A (en) * | 2021-10-29 | 2021-12-31 | 深圳市福田区环境技术研究所有限公司 | Chemical nickel waste liquid treatment process |
| CN114873613B (en) * | 2022-05-16 | 2023-10-27 | 湖北吉星化工集团有限责任公司 | Method for refining and recovering sodium hypophosphite by using byproduct sodium sulfate |
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| US5192418A (en) * | 1991-07-08 | 1993-03-09 | Bethlehem Steel Corporation | Metal recovery method and system for electroplating wastes |
| JP2003080268A (en) * | 2001-09-07 | 2003-03-18 | Yoshitama Seito Co Ltd | Treatment method for waste chemical plating solution |
| JP4399529B2 (en) * | 2003-07-25 | 2010-01-20 | 吉玉精鍍株式会社 | Treatment method of electroless plating waste liquid |
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