CN101333025A - Process for removing arsenic in alkaline etching waste liquid for producing printed circuit board - Google Patents
Process for removing arsenic in alkaline etching waste liquid for producing printed circuit board Download PDFInfo
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- CN101333025A CN101333025A CNA2008100683968A CN200810068396A CN101333025A CN 101333025 A CN101333025 A CN 101333025A CN A2008100683968 A CNA2008100683968 A CN A2008100683968A CN 200810068396 A CN200810068396 A CN 200810068396A CN 101333025 A CN101333025 A CN 101333025A
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- circuit board
- printed circuit
- waste liquid
- arsenic
- alkaline etching
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Abstract
The invention relates to a method for removing arsenic in printed circuit board basic waste etching solution; ferric chloride solution with a concentration of 0.5-5mol/L is prepared and is ready for use according to the dosage of 1-5kg/m<3> of the printed circuit board basic waste etching solution; then the ferric chloride solution is slowly added in the printed circuit board basic waste etching solution with corresponding amount, is stirred to carry out reaction for 30-120min and is filtered. The precipitate generated in the invention is easy to be filtered, arsenic removal effect is significant, arsenic residual rate is low, additional filtrating aid approach is not needed, and the whole technique is simple and controllable.
Description
Technical field
The present invention relates to the removal method of arsenic in a kind of alkaline etching waste liquid for producing printed circuit board.
Background technology
The characteristics of alkaline etching waste liquid for producing printed circuit board (being called for short " PCB alkaline etching waste liquid for producing ") are: copper and ammonia content height, and alkalescence, pH value are between 8～10, and arsenic content is generally in 30mg/L.With the PCB alkaline etching waste liquid for producing is that raw material can be made the mantoquita product, but must make arsenic content reach standard by deeply removing arsenic.
Arsenic in the PCB alkaline etching waste liquid for producing is mainly derived from the manufacturing of copper clad plate, and by some mantoquita product of PCB alkaline etching waste liquid for producing production arsenic is had strict requirement.Basic skills about the arsenic containing solution arsenic removal has traditional chemical precipitation method, functional polymer embrane method, reverse osmosis method, solvent extration, ion exchange method, flotation process, biological process, induces dearsenification method and adsorption coprecipitation method at present.Because the singularity of PCB alkaline etching waste liquid for producing itself makes above-mentioned existing method use and has certain limitation.
About the ferrite process arsenic removal, report is more on the document, becomes to be convenient to filtering oxide compound but how to allow iron ion water at normal temperature in the waste water that needs are handled separate, and reaches the purpose of arsenic removal, has not yet to see report.Known systems adopts intensification usually, adds flocculating aids, adds crystal seed or earlier ferric hydroxide colloid has been changed into filtering hydrous iron oxide, and then is used for removal of impurities., add paper pulp and help filter for the ease of filtering such as Chinese patent 85102296; Chinese patent 200410018281.X adopts the mode that heats up to help filter; Chinese patent 200410019876.7 adopts ball shaped celluloses as the mode of carrier etc.
Report on the professional journals does not relate to how to be issued to the filtering problem of being convenient in easy operational condition yet, such as (ferric oxide mineral surface chemistry feature and adsorption mechanism researchs thereof in the carbonatite laterite such as Zhu Lijun, ACTA Scientiae Circumstantiae, Vol.17, No.2, Apr, 1997, p174～178) just surface chemistry feature and the adsorption mechanism to the ferric oxide mineral illustrates; Zhu Yinian etc. (arsenic adsorption progress, scientific seminar's collection of thesis is learned in south China youngly, and 2003, p218～222) oxide compound of iron and the adsorption mechanism of oxyhydroxide are summed up; (iron carbonyl solution-montmorillonite system is to the absorption of arsenic for Liao Libing etc., Chinese science D collects geoscience 2005,35 (8): 750 ~ 757) described the influence of system condition to the adsorption rate of arsenic, wherein the montmorillonite of Jia Ruing is exactly in order to improve the throw out phase of iron ion, so that improve strainability; Ye Ying etc. (influence of reaction of pyrrhosiderite and precursor adsorption arsenous anion ionic thereof and pretreatment process, petromineralogy magazine, Vol.24, No.6 Nov.2005 p551～555) compare pyrrhosiderite and the ironic hydroxide gel adsorption process to arsenic.
Summary of the invention
The objective of the invention is at the above problem, the removal method of arsenic in a kind of alkaline etching waste liquid for producing printed circuit board is provided.
The present invention includes following steps:
(1) consumption by iron trichloride is 1～5kg/m
3Alkaline etching waste liquid for producing printed circuit board, compound concentration is the liquor ferri trichloridi of 0.5～5mol/L, and is standby;
(2) the above-mentioned liquor ferri trichloridi for preparing is slowly joined in the alkaline etching waste liquid for producing printed circuit board of corresponding amount, stirring reaction 30～120min filters.
The liquor ferri trichloridi of 0.5～5mol/L is formulated with the FERRIC CHLORIDE ANHYDROUS solid in (1) step of the present invention, or the dilution of the liquor ferri trichloridi of high density is formed.
The reaction in (2) step of the present invention is to carry out in reactor, after having filtered, with the residual solid of a spot of clear water cleaning reaction still inwall.
Arsenic removal principle of the present invention is: iron ion can be hydrolyzed into the filtering throw out of being convenient to of puffy, and this throw out can arsenic-adsorbing, thereby reaches the purpose of arsenic removal.
Technique effect of the present invention is: the precipitation that the present invention produces is easy to filter, and effect of removing arsenic is obvious, and the arsenic residual rate is low, does not need the extra filter means that help, and integrated artistic is simple, and is controlled.
Embodiment
Embodiment one: the PCB alkaline etching waste liquid for producing arsenic removal of production of copper product salt enterprise.
1, prepares liquor ferri trichloridi in advance: with 2.8kg FeCl
3Solid is dissolved in the water of 11.5kg, is mixed with the liquor ferri trichloridi of 1.5mol/L;
2, toward 1m
3Reactor in suction 0.85m
3The PCB alkaline etching waste liquid for producing, start stirring rake, slowly import the liquor ferri trichloridi that previous step prepares in advance then, reaction 1.5h filters, three batches of continuous production have filtered afterwards with the residual solid of a spot of clear water cleaning reaction still inwall at every turn.Following each table of three batches analytical results:
Table 1
Table 2
Table 3
By above-mentioned each table as seen, effect of removing arsenic is obvious, and strainability is fine.
Embodiment two: the PCB alkaline etching waste liquid for producing arsenic removal of production of copper product salt enterprise.
1, prepares liquor ferri trichloridi in advance: with 2kg FeCl
3Solid is dissolved in the water of 12.2kg, is mixed with the liquor ferri trichloridi of 1mol/L;
2, toward 1m
3Reactor in suction 0.85m
3The PCB alkaline etching waste liquid for producing, start stirring rake, slowly import the liquor ferri trichloridi for preparing in advance then, reaction 2h filters, 3 batches of continuous production have filtered afterwards with the residual solid of a spot of clear water cleaning reaction still inwall at every turn.Following each table of analytical results:
Table 4
Table 5
Table 6
By above-mentioned each table as seen, all hang down 1mg/L through the arsenic content in the PCB alkaline etching waste liquid for producing of this method processing, and filtration time is all very short.
Embodiment three: the PCB alkaline etching waste liquid for producing arsenic removal of production of copper product salt enterprise.
1, prepares liquor ferri trichloridi in advance: with 0.85kg FeCl
3Solid is dissolved in the water of 1.1kg, is mixed with the liquor ferri trichloridi of 4.8mol/L, if the dissolving difficulty can add the hydrochloric acid hydrotropy in right amount.
2, toward 1m
3Reactor in suction 0.85m
3The PCB alkaline etching waste liquid for producing, start stirring rake, slowly import the liquor ferri trichloridi for preparing in advance then, reaction 2h filters, 3 batches of continuous production, with the residual solid of a spot of clear water cleaning reaction still inwall, analytical results is following respectively to be shown after having filtered at every turn:
Table 7
Table 8
Table 9
Embodiment four: the PCB alkaline etching waste liquid for producing arsenic removal of production of copper product salt enterprise.
1, prepares liquor ferri trichloridi in advance: with 4.25kg FeCl
3Solid is dissolved in the water of 52.3kg, is mixed with the liquor ferri trichloridi of 0.5mol/L;
2, toward 1m
3Reactor in suction 0.85m
3The PCB alkaline etching waste liquid for producing, start stirring rake, slowly import the liquor ferri trichloridi for preparing in advance then, reaction 30min filters 3 batches of continuous production, with the residual solid of a spot of clear water cleaning reaction still inwall, analytical results is following respectively to be shown after each the filtration:
Table 10
Table 11
Table 12
Claims (3)
1. the removal method of arsenic in the alkaline etching waste liquid for producing printed circuit board is characterized in that comprising the steps:
(1) consumption by iron trichloride is 1～5kg/m
3Alkaline etching waste liquid for producing printed circuit board, compound concentration is the liquor ferri trichloridi of 0.5～5mol/L, and is standby;
(2) the above-mentioned liquor ferri trichloridi for preparing is slowly joined in the alkaline etching waste liquid for producing printed circuit board of corresponding amount, stirring reaction 30～120min filters.
2. the removal method of arsenic in the alkaline etching waste liquid for producing printed circuit board according to claim 1, it is characterized in that: the liquor ferri trichloridi of 0.5～5mol/L is formulated with the FERRIC CHLORIDE ANHYDROUS solid in described (1) step, or the dilution of the liquor ferri trichloridi of high density is formed.
3. the removal method of arsenic in the alkaline etching waste liquid for producing printed circuit board according to claim 1 and 2 is characterized in that: the reaction in described (2) step is to carry out in reactor, after having filtered, with the residual solid of a spot of clear water cleaning reaction still inwall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100683968A CN101333025B (en) | 2008-07-11 | 2008-07-11 | Process for removing arsenic in alkaline etching waste liquid for producing printed circuit board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100683968A CN101333025B (en) | 2008-07-11 | 2008-07-11 | Process for removing arsenic in alkaline etching waste liquid for producing printed circuit board |
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| CN101333025A true CN101333025A (en) | 2008-12-31 |
| CN101333025B CN101333025B (en) | 2010-12-01 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102807278A (en) * | 2012-08-07 | 2012-12-05 | 华南理工大学 | Method for removing irons from alkaline etching liquid waste of printed-circuit boards |
| CN102815780A (en) * | 2012-08-07 | 2012-12-12 | 华南理工大学 | Method of removing arsenic from basic etching waste liquid of printed circuit board |
| CN102815818A (en) * | 2012-08-07 | 2012-12-12 | 华南理工大学 | Method of removing arsenic from printed circuit board acid etching exhausted liquid |
-
2008
- 2008-07-11 CN CN2008100683968A patent/CN101333025B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102807278A (en) * | 2012-08-07 | 2012-12-05 | 华南理工大学 | Method for removing irons from alkaline etching liquid waste of printed-circuit boards |
| CN102815780A (en) * | 2012-08-07 | 2012-12-12 | 华南理工大学 | Method of removing arsenic from basic etching waste liquid of printed circuit board |
| CN102815818A (en) * | 2012-08-07 | 2012-12-12 | 华南理工大学 | Method of removing arsenic from printed circuit board acid etching exhausted liquid |
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| Publication number | Publication date |
|---|---|
| CN101333025B (en) | 2010-12-01 |
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