CN102978414A - Method for precipitating gold from cyanogen-containing gold-plated waste liquid - Google Patents
Method for precipitating gold from cyanogen-containing gold-plated waste liquid Download PDFInfo
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- CN102978414A CN102978414A CN2012104963574A CN201210496357A CN102978414A CN 102978414 A CN102978414 A CN 102978414A CN 2012104963574 A CN2012104963574 A CN 2012104963574A CN 201210496357 A CN201210496357 A CN 201210496357A CN 102978414 A CN102978414 A CN 102978414A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention provides a method for precipitating gold from a cyanogen-containing gold-plated waste liquid. The method comprises the following steps of: (1) adding the cyanogen-containing gold-plated waste liquid containing 1-500mg/L gold ions into a container, adjusting the pH to 12 with 10wt% NaOH, adding NaClO to adjust the redox potential to 350mv, and reacting for 30 minutes; adding 10wt% H2SO4 to adjust the pH to 7.5, adding NaClO to adjust the redox potential to 650mv, and reacting for 30 minutes so that the cyanogen concentration in the waste liquid is damaged to less than 1mg/L; and (2) adding a gold precipitator into the cyanogen-containing gold-plated waste liquid with damaged cyanogen, stirring for reaction and filtering. The method provided by the invention can be used for protecting environment, precipitating gold and improving the utilization rate of resources.
Description
Technical field
The invention belongs to technical field of chemical engineering, be specifically related to a kind of from contain the gold-plated waste liquid of cyanogen the method for precipitation of gold.
Background technology
Printed circuit board (Printed Circuit Board, be called for short PCB) need to carry out in the production process gold-plated, prussiate is electroplated because of advantages such as its plating quality are good, erosion resistance is high, bath stability, and operating temperature range is wide, is not also replaced fully by cyanideless electro-plating at present.Cyano group in the prussiate electroplating effluent (CN-) enters environment can cause severe contamination, and usually can contain the 10-300mg/L gold in the waste liquid, directly enters environment and can cause the wasting of resources.
Contain the gold-plated waste liquid resource of cyanogen in order to fully utilize, general enrichment, precipitation technology mainly contains at present: Zn powder substitution method is (such as non-patent literature " reclaiming the research of gold " from electroplating effluent, China's goods and materials regeneration, 1997.06.8-9.), active carbon adsorption and electrolytic process (such as patent documentation CN 101705507A) etc.High, the complex treatment process of Zn powder substitution method temperature of reaction is used for containing the weak effect of the gold-plated waste liquid of cyanogen, golden deposition rate is low, and produces new chemical substance in precipitation process, increases the wastewater treatment burden.Active carbon adsorption active regeneration difficulty, the absorption of waste liquid gold not exclusively.Gold in the electrolytic process waste liquid can only drop to 5mg/L usually.
Summary of the invention
The method that the object of the present invention is to provide a kind of gold that will contain in the gold-plated waste liquid of cyanogen to precipitate fully.
The method of the present invention that can realize above-mentioned purpose be a kind of from contain the gold-plated waste liquid of cyanogen the method for precipitation of gold, it is characterized in that, comprise the steps:
(1) destroys cyanogen
What add gold ion content and be 1-500mg/L in container contains the gold-plated waste liquid of cyanogen, with mass concentration be 10% NaOH to regulate pH be 12, adding NaClO, to regulate redox potential be 350mv, reacts 30min, adds mass concentration again and be 10% H
2SO
4Regulating pH is 7.5, and adding NaClO adjusting redox potential is 650mv, and reaction 30min makes the cyanogen concentration in the waste liquid destroyed extremely less than 1mg/L;
(2) precipitation of gold
Add golden precipitation agent containing after destroyed to cyanogen in the gold-plated waste liquid of cyanogen, stirring reaction filters.
In the above-mentioned steps (1), as container, the preferred strong enamel reaction still of non-corrosibility.
In the above-mentioned steps (2), described golden precipitation agent can be Sodium dimethyldithiocarbamate 40min or Thiocarb, can use solid, also can use its aqueous solution.
The add-on (in Sodium dimethyldithiocarbamate 40min or Thiocarb) of gold precipitation agent is generally 10-30000 times that contains gold ion content in the gold-plated waste liquid of cyanogen, and preferred 20-20000 times, more preferably 50-18000 doubly.
The adding mode of gold precipitation agent can be solid-state adding, also can add by the aqueous solution take mass concentration as 10-40%.
The reaction times of precipitation of gold is generally 15-120min, preferred 15-60min, and more preferably 15-30min, the temperature of reaction of precipitation of gold is generally room temperature-90 ℃.
Use method of the present invention to process and contain the gold-plated waste liquid of cyanogen, the gold in the waste liquid can be captured with sedimentary state fully, thereby has improved resource utilization.And method treatment process of the present invention is simple, but waste liquid qualified discharge after the NaClO oxide treatment has alleviated environmental pollution.
Embodiment
Describe the present invention in detail below in conjunction with embodiment; but the following examples only are the better embodiment of the present invention; protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, all should be encompassed within protection scope of the present invention.
Embodiment 1
Adding cyanogen content in the 1000ml beaker is 108.0mg/L, gold content be 5.449mg/L contain cyanogen electroplating waste liquid 400ml, the dropping mass concentration is 10% NaOH adjusting pH to 12, dripping mass concentration and be 11% NaClO regulates redox-potential (ORP) and is 350mv, carry out the first step oxidation, reaction times 30min; The dropping mass concentration is 10% H
2SO
4Regulating pH is 7.5, and dripping NaClO adjusting ORP is 650mv, carries out the second step oxidation, reaction times 30min.With silver nitrate titration method cyanogen in the waste liquid is detected, cyanogen is less than 1mg/L in the waste liquid.
The mass concentration that adds in advance preparation in the waste liquid after at room temperature destroyed to cyanogen is 40% Sodium dimethyldithiocarbamate 40min aqueous solution 82.0g, stirs 30min, filters.With atomic absorption spectrophotometry (WFX-110B type atomic absorption spectrophotometer, Rayleigh Analytical Instrument Co., Ltd in Beijing produces) gold ion in the filtrate is detected, do not detect gold ion.Adding NaClO solution in the filtrate, to adjust ORP be 50mv, filters the filtrate qualified discharge.
Embodiment 2
Substitute Sodium dimethyldithiocarbamate 40min with Thiocarb, other destroys cyanogen, golden deposition condition fully with embodiment 1.Gold ion in the filtrate is detected, do not detect gold ion.Adding NaClO solution in the filtrate, to adjust ORP be 50mv, filters the filtrate qualified discharge.
Embodiment 3
Substitute its solution of 40% with 32.8g Sodium dimethyldithiocarbamate 40min solid and join in the waste liquid of cyanogen after destroyed, other working method is fully with embodiment 1.Gold ion in the filtrate is detected, do not detect gold ion.Adding NaClO solution in the filtrate, to adjust ORP be 50mv, filters the filtrate qualified discharge.
Embodiment 4
Substitute its solution of 40% with 32.8g Thiocarb solid and join in the waste liquid of cyanogen after destroyed, other working method is fully with embodiment 2.Gold ion in the filtrate is detected, do not detect gold ion.Adding NaClO solution in the filtrate, to adjust ORP be 50mv, filters the filtrate qualified discharge.
Embodiment 5
Carry out the gold precipitation after waste liquid after cyanogen is destroyed is heated to 90 ℃, other working method is fully with embodiment 1.Gold ion in the filtrate is detected, do not detect gold ion.Adding NaClO solution in the filtrate, to adjust ORP be 50mv, filters the filtrate qualified discharge.
Embodiment 6
Stir 15min after adding golden precipitation agent, other working method is fully with embodiment 1.Gold ion in the filtrate is detected, and gold ion content is 0.987mg/L.Adding NaClO solution in the filtrate, to adjust ORP be 50mv, filters the filtrate qualified discharge.
Claims (10)
1. the method for a precipitation of gold from contain the gold-plated waste liquid of cyanogen is characterized in that, comprises the steps:
(1) destroys cyanogen
What add gold ion content and be 1-500mg/L in container contains the gold-plated waste liquid of cyanogen, with mass concentration be 10% NaOH to regulate pH be 12, adding NaClO, to regulate redox potential be 350mv, reacts 30min, adds mass concentration again and be 10% H
2SO
4Regulating pH is 7.5, and adding NaClO adjusting redox potential is 650mv, and reaction 30min makes the cyanogen concentration in the waste liquid destroyed extremely less than 1mg/L;
(2) precipitation of gold
Add golden precipitation agent containing after destroyed to cyanogen in the gold-plated waste liquid of cyanogen, stirring reaction filters.
2. method according to claim 1 is characterized in that, described golden precipitation agent is Sodium dimethyldithiocarbamate 40min or Thiocarb.
3. method according to claim 1 is characterized in that, the add-on of golden precipitation agent be contain gold ion content in the gold-plated waste liquid of cyanogen 10-30000 doubly.
4. method according to claim 3 is characterized in that, the add-on of golden precipitation agent be contain gold ion content in the gold-plated waste liquid of cyanogen 20-20000 doubly.
5. method according to claim 3 is characterized in that, the add-on of golden precipitation agent be contain gold ion content in the gold-plated waste liquid of cyanogen 50-18000 doubly.
6. method according to claim 1 is characterized in that, the adding mode of golden precipitation agent is that solid-state adding or the aqueous solution take mass concentration as 10-40% add.
7. method according to claim 1 is characterized in that, the reaction times of precipitation of gold is 15-120min.
8. method according to claim 7 is characterized in that, the reaction times of precipitation of gold is 15-60min.
9. method according to claim 7 is characterized in that, the reaction times of precipitation of gold is 15-30min.
10. method according to claim 1 is characterized in that, the temperature of reaction of precipitation of gold is room temperature-90 ℃.
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| CN201210496357.4A CN102978414B (en) | 2012-11-28 | 2012-11-28 | Method for precipitating gold from cyanogen-containing gold-plated waste liquid |
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| CN201210496357.4A CN102978414B (en) | 2012-11-28 | 2012-11-28 | Method for precipitating gold from cyanogen-containing gold-plated waste liquid |
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| CN102978414B CN102978414B (en) | 2015-02-18 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106702158A (en) * | 2015-07-13 | 2017-05-24 | 灵宝欣宏金属科技有限公司 | Regenerating method for waste generated by manufacturing gold potassium citrate and/or potassium dicyanoaurate through electrolysis method |
| CN108374090A (en) * | 2018-03-28 | 2018-08-07 | 广东致卓环保科技有限公司 | A kind of gold refinement method applied to the gold-plated waste liquid of sulfurous acid system |
| CN113802008A (en) * | 2021-09-16 | 2021-12-17 | 兰州大学 | Method for treating waste liquid containing platinum group noble metal |
| CN113832343A (en) * | 2021-09-07 | 2021-12-24 | 昆明理工大学 | Method for recovering gold in thiosulfate gold leaching system by precipitation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106702158A (en) * | 2015-07-13 | 2017-05-24 | 灵宝欣宏金属科技有限公司 | Regenerating method for waste generated by manufacturing gold potassium citrate and/or potassium dicyanoaurate through electrolysis method |
| CN106702158B (en) * | 2015-07-13 | 2019-01-01 | 灵宝欣宏金属科技有限公司 | Electrolysis method manufactures the regeneration method of waste produced by citric acid gold potassium and/or gold potassium cyanide |
| CN108374090A (en) * | 2018-03-28 | 2018-08-07 | 广东致卓环保科技有限公司 | A kind of gold refinement method applied to the gold-plated waste liquid of sulfurous acid system |
| CN108374090B (en) * | 2018-03-28 | 2019-07-12 | 广东致卓环保科技有限公司 | A kind of gold refinement method applied to the gold-plated waste liquid of sulfurous acid system |
| CN113832343A (en) * | 2021-09-07 | 2021-12-24 | 昆明理工大学 | Method for recovering gold in thiosulfate gold leaching system by precipitation method |
| CN113802008A (en) * | 2021-09-16 | 2021-12-17 | 兰州大学 | Method for treating waste liquid containing platinum group noble metal |
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| CN102978414B (en) | 2015-02-18 |
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