CN107417007A - A kind of resin method recovery process for electroplating spent acid and diluted acid waste water - Google Patents
A kind of resin method recovery process for electroplating spent acid and diluted acid waste water Download PDFInfo
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- CN107417007A CN107417007A CN201710594640.3A CN201710594640A CN107417007A CN 107417007 A CN107417007 A CN 107417007A CN 201710594640 A CN201710594640 A CN 201710594640A CN 107417007 A CN107417007 A CN 107417007A
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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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
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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
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Abstract
The present invention proposes a kind of resin method recovery process for electroplating spent acid and diluted acid waste water, and the technique mainly includes two steps, and the first step removes solid particle class impurity by the waste acid water of discharge is filtered；Second step removes a large amount of metal ions in waste water by hybrid resin, the metal ion contents such as aluminium in sulfuric acid solution, iron, lead is reached recycling.The innovative point of the present invention is that the exchange interaction of bind metal ion and the chelation of metal ion realize the removing of metal ion using hybrid resin, and the technique has recyclable operation, organic efficiency height, energy-conserving and environment-protective, safe coefficient height, the advantages of technique is simple.
Description
Technical field
The invention belongs to electroplate, chemical field, and in particular to a kind of resin method recovery work for electroplating spent acid and diluted acid waste water
Skill.
Background technology
Metal ion on plating piece there are certain requirements in electroplating industry, so acid cleaning plating piece can be used to remove before plating
The metal ions such as iron, aluminium, lead, and acid solution is gone with washing, substantial amounts of spent acid is produced in this method and washes sour water, and this effluent part
Turn into the higher diluted acid waste water of metal ion after mixing, it completely can be by reducing or removing wherein metal ion recovery again
Utilize to clean plating piece.Important source material of the sulfuric acid as chemical industry and steel industry, it produces substantial amounts of diluted acid in process of production
Waste water, and acidifying pollution and heavy metal pollution caused by a large amount of iron ions taken out of in troilite technique, traditional processing make more
With neutralisation, i.e., diluted acid waste water is fallen by acid-base neutralization reaction and precipitation reaction post processing.
A kind of sulfate wastewater reclamation device disclosed in Chinese Patent Application No. CN201120059688.2, the device are
Metal ion is removed by two-stage nanofiltration technique, realizes the purpose of waste water recycling, nanofiltration technique recycles true to sulfuric acid wastewater containing
There is good impurity-eliminating effect, but it is low to the high feed liquid processing cost height of impurity concentration, treatment effeciency, and filtering technique is to principal component
Loss late it is high.A kind of sulfuric acid to the ion containing low-concentration metallic is disclosed in Chinese Patent Application No. CN201310426232.9
Method of wastewater treatment, this method first neutralizes with ammoniacal liquor and produces metal salt precipitate, then removes body by macroporous absorbent resin
The ammonium salt introduced in system, by not generating the foreign metal ion of precipitation in ion exchange resin removing system with ammoniacal liquor, then lead to
Cross 250 DEG C of high temperature pyrolysis and obtain the sulfuric acid of recoverable, this method not only newly introduces the impurity of Ammonia, also needs to remove Ammonia again
Impurity, secondly cost recovery is high, and security is relatively low, and removal utilization rate of the macroporous absorbent resin to impurity is low.
The diluted acid waste water of high metal content has very high recycling valency in the industry such as plating, metallurgy, gas washing in SA production
Value, Chinese patent and technique reported in the literature and method high treating effect be present more but cost is high or cost is low but locates
Manage the problems such as ineffective, while the problems such as complex process, operation difficulty are big, organic efficiency is low are also that diluted acid waste water is difficult to reclaim
The remote cause of recycling.Ion exchange resin has removing well in the performance indications such as technique, operation, safety and environmental protection
Metal ion effect, but the high hydrogen ion concentration of acidity causes greatly the metal final processing capacity that comes off again after exchanging low in waste water, and chela
Though resin is good with metalloform-selective, production cost is high.
The content of the invention
It is an object of the invention to provide a kind of resin method recovery process for electroplating spent acid and diluted acid waste water, the technique passes through
The metal ions such as the iron in diluted acid waste water, aluminium, lead, zinc are separated using hybrid resin and realize that the recycling of diluted acid is plated to clean
Part removes metal ion, and the recovery process has the advantages of dilute acid recycle rate is high, process is simple, safety and environmental protection, cheap cost.
To achieve the above object, the resin method recovery process of plating spent acid and diluted acid waste water proposed by the present invention, is pressed successively
Following steps are handled waste acid water：
Step a：Remove the solid particle in waste acid water；
Step b：Metal ion in waste acid water is removed using hybrid resin；
Step c：Regeneration treatment is carried out to the used hybrid resins of step b；
Step d：Hybrid resin after regeneration is back to the removal that metal ion in waste acid water is carried out in step b.
Further, in the resin method recovery process of the plating spent acid and diluted acid waste water, in step a, using taking out
The filter type of filter pump or filter paper removes the solid particle in waste acid water.
Further, in the resin method recovery process of the plating spent acid and diluted acid waste water, the hybrid resin is by sun
Ion exchange resin and chelating resin composition.
Further, in the resin method recovery process of the plating spent acid and diluted acid waste water, in stepb using mixing
Resin removes the metal ion in waste acid water, comprises the following steps：
Step b1：Hybrid resin pre-processes；
Cationic ion-exchange resin and chelating resin are well mixed and loaded in exchange column by predetermined volume ratio, forms resin
Post, use mass fraction to be pre-processed for 2.5% sulfuric acid solution to hybrid resin in exchange column, hybrid resin is processed into
Cationic ion-exchange resin Hydrogen；
Step b2：The operation of hybrid resin；
By waste acid water with predetermined flow rate by resin column in step b1, with concentration of metal ions in the feed liquid of resin column exit
Determine the terminal of hybrid resin operation.
Further, in the resin method recovery process of the plating spent acid and diluted acid waste water, the hybrid resin middle-jiao yang, function of the spleen and stomach
The predetermined volume ratio of ion exchange resin and chelating resin is more than 4.
Further, it is described useless in step b2 in the resin method recovery process of the plating spent acid and diluted acid waste water
Sour water passes through resin column with 0.5~5BV/h flow velocitys.
Further, in the resin method recovery process of the plating spent acid and diluted acid waste water, in step c, compound tree
Fat regeneration treatment：
Resin column 2h~5h is soaked using 0.5~1.5BV of acid solution, then arranges acid solution with 0.5~1.0BV/h flow velocity
Go out, reuse acid solution and eject the waste acid water remained in resin column, hybrid resin regeneration treatment finishes.
Further, in the resin method recovery process of the plating spent acid and diluted acid waste water, the acid solution selects quality
Fraction is 3%~20% citric acid or acetic acid aqueous solution.
Compared with prior art, beneficial effects of the present invention：The technique is separated in diluted acid waste water by using hybrid resin
Iron, aluminium, lead, the metal ion such as zinc realize the recycling of waste acid water, the recovery process has that dilute acid recycle rate is high, process
Simply, safety and environmental protection, the advantages of cost is cheap.
Embodiment
The plating spent acid of the present invention and the resin method recovery process of diluted acid waste water will be described in more detail below, its
In illustrate the preferred embodiments of the present invention, it should be appreciated that those skilled in the art can change invention described herein, and
Still the advantageous effects of the present invention are realized.Therefore, description below is appreciated that knowing extensively for those skilled in the art
Road, and it is not intended as limitation of the present invention.
Plating spent acid is mainly that electroplating industry cleans spent acid caused by plating piece metal impurities using acid before plating and washed
Sour waste water；Diluted acid waste water is mainly caused diluted acid waste water and to wash sour waste water in gas washing in SA production, is united below two kinds of acids waste water
Referred to as waste acid water, having in common that for they contain larger amount of impurity metal ion in waste acid water, and wherein golden by going out
All possess the value of recyclable recycling after category ion such as Fe, Al, Pb impurity, the discharge of acids waste water can be greatly reduced.
Based on above-mentioned, the present invention proposes a kind of resin method recovery process for electroplating spent acid and diluted acid waste water, technique master
To include two steps, the first step is by the filtered removing solid particle class impurity of the waste acid water of discharge；Second step is taken off by hybrid resin
Except a large amount of metal ions in waste water, the metal ion contents such as aluminium in sulfuric acid solution, iron, lead are made to reach recycling.This hair
Bright innovative point is that the exchange interaction of bind metal ion and the chelation of metal ion realize metal using hybrid resin
The removing of ion, the technique are easily excellent in the presence of recyclable operation, organic efficiency height, energy-conserving and environment-protective, safe coefficient height, technique
Point.
Technical scheme is totally as follows：
Step a：The solid particle in waste acid water is removed, the solid in waste acid water is filtered out using suction filter pump or filter paper
Grain；
Step b：Metal ion in waste acid water is removed using hybrid resin；
Step c：Regeneration treatment is carried out to the used hybrid resins of step b；
Step d：Hybrid resin after regeneration is back to the removal that metal ion in waste acid water is carried out in step b.
Wherein, in stepb, the metal ion that hybrid resin is removed in waste acid water includes hybrid resin and pre-processes and mix
The step of operation two of resin.
Step b1：Hybrid resin pre-processes
Cationic ion-exchange resin and chelating resin are well mixed in ratio of the predetermined volume ratio more than 4 and load exchange column
It is interior, resin column is formed, is replaced by national standard GB/T 5476-2013 and by the hydrochloric acid solution used in national standard GB/T 5476-2013
Into mass fraction be 2.5% sulfuric acid solution hybrid resin in exchange column is pre-processed, by hybrid resin be processed into sun from
Sub-exchange resin Hydrogen；
Step b2：The operation of hybrid resin
By waste acid water with predetermined flow rate by resin column in step b1, predetermined flow rate is preferably that (BV is tree to 1~5BV/h
Fat column volume abridge), with concentration of metal ions in the feed liquid of resin column exit determine hybrid resin operation terminal.
The cationic ion-exchange resin and chelating resin that the present invention uses may be selected from but be not limited to listed in Table：
In step c, hybrid resin regeneration concretely comprises the following steps：Using 0.5~1.5BV of acid solution immersions resin column 2h~
5h, then acid solution is discharged with 0.5~1.0BV/h flow velocity, reuse acid solution by the waste acid water remained in resin column ejection and
It is unlikely to hybrid resin being allowed to dry, and for ensureing resin regeneration effect, hybrid resin regeneration treatment finishes.Resin
It should be kept not in liquid in grain dress chromatographic column, the resin particle (i.e. resin is allowed to dry) for avoiding drying storage can operationally cause
The generation of bubble, the generation for phenomena such as causing feed liquid processing irregular, bias current.3%~20% citric acid or second can be selected in acid solution
Aqueous acid, enough carboxylate radicals can be introduced, by concentration difference and the chelation of carboxylate radical and metal ion, reach fine
Regeneration effect.
Embodiment 1
The first step, filtering
This example raw material use quality fraction 20% electroplates sulfuric acid wastewater containing, wherein 10~15g/ of major impurity aluminium ion concentration
L, the solid particle in feed liquid is filtered using filter paper.
Second step, hybrid resin remove the metal ion in waste acid water
(1) pretreatment of resin
D001SC resins 90mL is well mixed with D418 resins 10mL loads simple glass chromatographic column, keeps resin chromatographing
Ratio of height to diameter is in (1~7) in post:1.It is by national standard GB/T 5476-2013 and the hydrochloric acid used in national standard GB/T 5476-2013 is molten
Liquid is substituted for the sulfuric acid solution that mass fraction is 2.5% and hybrid resin in exchange column is pre-processed.I.e.：Use 1mol/L's
NaOH aqueous solution 5BV (resin column layer volume), by resin, drop is washed till with 5~15BV deionized water with 2~5BV/h flow velocity
Go out liquid pH≤8, washed with 2.5% aqueous sulfuric acid 5BV with 2~5BV/h flow velocity by resin with 5~15BV deionization
To drip pH >=6.
(2) resin is run
Spent acid filter liquor is passed through into resin column, upper column quantity 500mL, i.e. 5BV feed liquid with 0.5~1.0BV/h flow velocity.
The regeneration of 3rd step, resin
Use the 8% acetic acid aqueous solution 0.8BV immersion resins 3h (citric acids or acetic acid of acid solution optional 3%~20%
The aqueous solution), after discharged with 0.5~0.7BV/h flow velocity, new acid solution can be reused according to experimental conditions to be remained in resin bed
Spent acid ejection and be unlikely to resin being allowed to dry.
Aluminium ion concentration is down to 5.3g/L, sulfuric acid concentration 18% from resin column outlet drip after resin treatment.
Embodiment 2：
The first step, filtering
In example 2 use sulfuric acid production process in accessory substance waste acid water --- the dilute sulfuric acid of mass fraction about 18% gives up
Liquid (waste acid water), wherein 10~15g/L of major impurity aluminium ion concentration, the solid impurity in waste acid water is filtered using filter paper.
Second step, hybrid resin remove metal ion
(1) pretreatment of resin
D001AM resins 85mL is well mixed with S940 resins 15mL loads simple glass chromatographic column, keeps resin chromatographing
Ratio of height to diameter is in (1~7) in post:1.It is by national standard GB/T 5476-2013 and the hydrochloric acid used in national standard GB/T 5476-2013 is molten
Liquid is substituted for the sulfuric acid solution that mass fraction is 2.5% and hybrid resin in exchange column is pre-processed.I.e.：Use 1mol/L's
NaOH aqueous solution 5BV, by resin, is washed till drip pH≤8 with 5~15BV deionized water, used with 2~5BV/h flow velocity
2.5% aqueous sulfuric acid 5BV with 2~5BV/h flow velocity by resin, with 5~15BV deionized water be washed till drip pH >=
6。
(2) resin is run
By the spent acid aqueous solution with 1.0~1.5BV/h flow velocity by resin column, upper column quantity is the feed liquid that 400mL is 4BV.
3rd step, the regeneration of resin
Soak resin 2h using 8% acetic acid aqueous solution 0.8BV, after discharged with 1.0BV/h flow velocity, add 0.4BV's
The processing of 8% acetic acid aqueous solution, stays liquid level.
Aluminium ion concentration is down to 5.1g/L, sulfuric acid concentration 18% from resin column outlet drip after resin treatment.
Embodiment 3
The first step, filtering
In embodiment 3, waste acid water uses the dilute sulfuric acid of accessory substance mass fraction about 20% in sulfuric acid production process, wherein
Impurity aluminium ion concentration 15g/L, the solid impurity in feed liquid is filtered using filter paper.
Second step, hybrid resin remove metal ion；
(1) pretreatment of resin
D001SC resins 85mL is well mixed with D401 resins 15mL loads simple glass chromatographic column, keeps resin chromatographing
Ratio of height to diameter is in (1~7) in post:1.It is by national standard GB/T 5476-2013 and the hydrochloric acid used in national standard GB/T 5476-2013 is molten
Liquid is substituted for the sulfuric acid solution that mass fraction is 2.5% and hybrid resin in exchange column is pre-processed.I.e.：Use 1mol/L's
NaOH aqueous solution 5BV, by resin, is washed till drip pH≤8 with 5~15BV deionized water, used with 2~5BV/h flow velocity
2.5% aqueous sulfuric acid 5BV with 2~5BV/h flow velocity by resin, with 5~15BV deionized water be washed till drip pH >=
6；
(2) resin is run；
By waste acid water with 0.5~1.0BV/h flow velocity by resin column, upper column quantity is the feed liquid that 500mL is 5BV；
3rd step, the regeneration of resin；
Soak resin 5h using 8% acetic acid aqueous solution 1.0BV, after discharged with 1.0BV/h flow velocity, add 0.5BV's
The processing of 8% acetic acid aqueous solution, stays liquid level.
Aluminium ion concentration is down to 6.2g/L, sulfuric acid concentration 18% from resin column outlet drip after resin treatment.
Embodiment 4：
The first step, filtering
Use the dilute sulfuric acid of accessory substance mass fraction in sulfuric acid production process about 18%, wherein impurity lead, iron concentration
1.5~2.0g/L, the solid impurity in feed liquid is filtered using filter paper.
Second step, hybrid resin remove metal ion
(1) pretreatment of resin
D001SC resins 80mL is well mixed with D401 resins 20mL loads simple glass chromatographic column, keeps resin chromatographing
Ratio of height to diameter is in (1~7) in post:1.It is by national standard GB/T 5476-2013 and the hydrochloric acid used in national standard GB/T 5476-2013 is molten
Liquid is substituted for the sulfuric acid solution that mass fraction is 2.5% and hybrid resin in exchange column is pre-processed.I.e.：Use 1mol/L's
NaOH aqueous solution 5BV, by resin, is washed till drip pH≤8 with 5~15BV deionized water, used with 2~5BV/h flow velocity
2.5% aqueous sulfuric acid 5BV with 2~5BV/h flow velocity by resin, with 5~15BV deionized water be washed till drip pH >=
6；
(2) resin is run；
By dilute acid soln with 1.5~2.0BV/h flow velocity by resin column, upper column quantity is the feed liquid that 1000mL is 10BV；
3rd step, the regeneration of resin；
Soak resin 5h using 10% acetic acid aqueous solution 0.8BV, after discharged with 1.0BV/h flow velocity, and add 0.5BV
10% acetic acid aqueous solution processing, stay liquid level.
Liquid iron, the plumbum ion concentration≤800ppm oozed after resin treatment from resin column outlet, sulfuric acid concentration 17%.
Embodiment 5：
The first step, filtering；
In embodiment 5, waste acid water uses the dilute sulfuric acid of accessory substance mass fraction about 20% in sulfuric acid production process, wherein
Impurity aluminium ion concentration 15g/L, the solid impurity in feed liquid is filtered using filter paper.
Second step, hybrid resin remove metal ion；
(1) pretreatment of resin
D001SC resins 80mL is well mixed with D401 resins 20mL loads simple glass chromatographic column, keeps resin chromatographing
Ratio of height to diameter is in (1~7) in post:1.It is by national standard GB/T 5476-2013 and the hydrochloric acid used in national standard GB/T 5476-2013 is molten
Liquid is substituted for the sulfuric acid solution that mass fraction is 2.5% and hybrid resin in exchange column is pre-processed.Use 1mol/L's
NaOH aqueous solution 5BV, by resin, is washed till drip pH≤8 with 5~15BV deionized water, used with 2~5BV/h flow velocity
2.5% aqueous sulfuric acid 5BV with 2~5BV/h flow velocity by resin, with 5~15BV deionized water be washed till drip pH >=
6。
(2) resin is run
By the spent acid aqueous solution with 1.0~1.5BV/h flow velocity by resin column, upper column quantity is the feed liquid that 500mL is 5BV.
The regeneration of 3rd step, resin
Soak resin 2h using 8% aqueous citric acid solution 0.8BV, after discharged with 1.0BV/h flow velocity, and add
0.8BV 8% aqueous citric acid solution processing, stays liquid level.
Aluminium ion concentration is down to 6.5g/L, sulfuric acid concentration 19% from resin column outlet drip after resin treatment.
The technique of the foreign metal ions such as aluminium, iron, lead is removed in the present invention in waste acid water before raw aqueous acid is not destroyed
Putting to foreign metal ion has selection separation property well, such as aluminium ion can be reduced into≤6g/L by stoste 15g/L, iron,
Plumbum ion concentration is down to by 1.5~2.0g/L of stoste≤800ppm and the separation purifying technique have can follow bad property, easily manipulation and
The advantages that safety and stability.
Innovative point of the invention maximum is that separation purifying technique is not simple ion exchange process, and it is not only improved point
Single-minded selection of the separation material to foreign metals such as aluminium ions is improved from material ions switching performance, and with chelation
Property, reducing hydrogen ion of the ion exchange resin in acid solution is exchanged during causes acid solution to be lost；Cation exchange
Resin can not realize that chelation, chelating resin can not also realize ion exchange, i.e., single resin is difficult to realize that ion is handed over
The effect of changing and chelation, and hybrid resin overcomes above mentioned problem, and according to the mixed of both practical application process modifications resin
Composition and division in a proportion example can remove the foreign metal ions such as the aluminium ion in acid solution with this two kinds effects well.
To sum up, in the resin method recovery process of plating spent acid provided in an embodiment of the present invention and diluted acid waste water, by making
The recycling that the metal ions such as the iron in diluted acid waste water, aluminium, lead, zinc realize waste acid water, the recovery are separated with hybrid resin
Technique has the advantages of dilute acid recycle rate is high, process is simple, safety and environmental protection, cheap cost.
The preferred embodiments of the present invention are above are only, any restrictions effect is not played to the present invention.Belonging to any
Those skilled in the art, in the range of technical scheme is not departed from, to the invention discloses technical scheme and
Technology contents make the variation such as any type of equivalent substitution or modification, belong to the content without departing from technical scheme, still
Belong within protection scope of the present invention.
Claims (8)
1. a kind of resin method recovery process for electroplating spent acid and diluted acid waste water, it is characterised in that successively as follows to spent acid
Water is handled：
Step a：Remove the solid particle in waste acid water；
Step b：Metal ion in waste acid water is removed using hybrid resin；
Step c：Regeneration treatment is carried out to the used hybrid resins of step b；
Step d：Hybrid resin after regeneration is back to the removal that metal ion in waste acid water is carried out in step b.
2. the resin method recovery process of plating spent acid according to claim 1 and diluted acid waste water, it is characterised in that in step
In a, the solid particle in waste acid water is removed using the filter type of suction filter pump or filter paper.
3. the resin method recovery process of plating spent acid according to claim 1 and diluted acid waste water, it is characterised in that described mixed
Resin is made up of cationic ion-exchange resin and chelating resin.
4. the resin method recovery process of plating spent acid according to claim 3 and diluted acid waste water, it is characterised in that in step
The metal ion in waste acid water is removed using hybrid resin in b, comprised the following steps：
Step b1：Hybrid resin pre-processes；
Cationic ion-exchange resin and chelating resin are well mixed and loaded in exchange column by predetermined volume ratio, forms resin column,
Use mass fraction to be pre-processed for 2.5% sulfuric acid solution to hybrid resin in exchange column, hybrid resin is processed into sun
Ion exchange resin Hydrogen；
Step b2：The operation of hybrid resin；
Waste acid water is determined with predetermined flow rate by resin column in step b1 with concentration of metal ions in the feed liquid of resin column exit
The terminal of hybrid resin operation.
5. the resin method recovery process of plating spent acid according to claim 4 and diluted acid waste water, it is characterised in that described mixed
The predetermined volume ratio of resin cationic exchanger resin and chelating resin is more than 4.
6. the resin method recovery process of plating spent acid according to claim 4 and diluted acid waste water, it is characterised in that in step
In b2, the waste acid water passes through resin column with 0.5~5BV/h flow velocitys.
7. the resin method recovery process of plating spent acid according to claim 1 and diluted acid waste water, it is characterised in that in step
In c, hybrid resin regeneration treatment：
Resin column 2h~5h is soaked using 0.5~1.5BV of acid solution, then discharges acid solution with 0.5~1.0BV/h flow velocity, then
The waste acid water remained in resin column is ejected using acid solution, hybrid resin regeneration treatment finishes.
8. the resin method recovery process of plating spent acid according to claim 7 and diluted acid waste water, it is characterised in that the acid
Liquid is from the citric acid or acetic acid aqueous solution that mass fraction is 3%~20%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110841331A (en) * | 2019-10-23 | 2020-02-28 | 江苏永葆环保科技有限公司 | Method for separating iron and zinc in iron-containing waste acid |
| CN111534821A (en) * | 2020-03-31 | 2020-08-14 | 宁波三达化工有限公司 | Regeneration method of polishing waste acid |
| CN112279440A (en) * | 2020-05-27 | 2021-01-29 | 江苏国瑞科技有限公司 | Recycling process of waste acid |
| CN114229803A (en) * | 2021-11-23 | 2022-03-25 | 武汉钢铁有限公司 | Recycling method of dilute sulfuric acid byproduct in coke oven flue gas |
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