CN103074501A - Gold net recovery process - Google Patents
Gold net recovery process Download PDFInfo
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- CN103074501A CN103074501A CN2013100561073A CN201310056107A CN103074501A CN 103074501 A CN103074501 A CN 103074501A CN 2013100561073 A CN2013100561073 A CN 2013100561073A CN 201310056107 A CN201310056107 A CN 201310056107A CN 103074501 A CN103074501 A CN 103074501A
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to a gold net recovery process, which comprises the following steps of weighing a gold electrolytic net, and washing and collecting gold foam which is attached on the surface of the gold electrolytic net; drying the clean gold electrolytic net after being washed; pulverizing the dried gold electrolytic net; placing the pulverized material and the gold foam into a reaction kettle, slowly adding in-situ prepared aqua regia until the reaction is ended and no yellow smoke is generated, and standing the mixture to obtain the aqua regia gold; filtering the aqua regia gold with filter paper, washing filter residue, adding caustic soda liquid into the filtered aqua regia gold to adjust the pH value to be alkaline, slowing adding hydrazine to obtain sponge gold, and washing the sponge gold; placing the washed sponge gold into concentrated nitric acid to be heated until the liquid is settled; removing the supernate after the reaction in the concentrated nitric acid, and washing the sponge gold again; and drying the sponge gold after being washed for two times, and heating and ingoting the dried sponge gold in an induction furnace at high temperature. The method is simple to operate, low in requirement of equipment and capable of meeting the environmental protection requirement.
Description
Technical field
The present invention relates to a kind of recovery method of gold net, relate in particular to a kind of recovery technique of discarded gold net.
Background technology
Electron wastes is commonly called as " electronic waste ", and the electric or electronics that refers to go out of use and do not re-use mainly comprises the elimination product of communication electronic products such as the household electrical appliance such as refrigerator, air-conditioning, washing machine, televisor and computer etc.Electronic waste needs exercise due diligence, and in some developing countries, the phenomenon of electronic waste is very serious, and the environmental pollution that causes is threatening that the local resident's is healthy.The Gui Yu town in Guangdong is that China's electronic waste among the people reclaims the area that decomposition is concentrated the most, also is faced with very serious pollution threat when the locals obtains abundant income thus.Chu Guang, poplar natural feet, the paper that the people such as Jiang Mingxi deliver " from waste of gold plating procedure, reclaiming the expanding test research of gold " (" precious metal " in December, 2005, the 4th phase, the 26th volume.) introduced a kind of complexing agent and reductive agent of adopting in the literary composition and electroplate the method for decomposing waste material as electrolytic solution, but it is complicated to adopt this method to reclaim the precious metal step such as gold, and the complexing agent and the reductive agent itself that use have certain pollution to environment.Chinese patent " the recovery technological process of gold " (application number: 85109224.1) disclose a kind of method that adopts prussiate to separate the gold in the ore, but the prussiate itself that the method is used has severe toxicity, and the user of service is caused personal injury easily.Chinese patent " a kind ofly extracts platinum from inefficacy platinum alloy net, rhodium, the method of palladium " (application number: 201220058587.2) disclose and a kind ofly from discarded platinum alloy net, reclaim platinum, rhodium, the method of the precious metals such as palladium, adopted hydrochloric acid, nitric acid, sodium-chlor, sodium hydroxide, ammonium chloride, Sodium Nitrite, hydrazine hydrate, ammoniacal liquor, sodium sulphite, Silver Nitrate, deionized water, the number of chemical such as hydrogen and nitrogen reagent, heating for dissolving in the leaching process, repeatedly suction filtration and washing, drying and purification, the processing step more complicated, and operation is more loaded down with trivial details, does not propose a kind of technique of special recovery gold.
Summary of the invention
Main purpose of the present invention is, overcomes existing gold net and reclaims the defective that technique exists, and provide a kind of novel gold net to reclaim technique, technical problem to be solved is to reduce operation steps, and environmentally friendly, thus more be suitable for practicality, and have the utility value on the industry.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
A kind of gold net reclaims technique, and the method comprises the steps:
(1) clean, golden electrolysis net is weighed, record data, the golden foam of flushing surface attachment, and collect the golden foam that washes;
(2) oven dry with the golden electrolysis net oven dry of rinsing well, is weighed record data after the cooling;
(3) pulverize, the golden electrolysis net after the oven dry is pulverized, collect simultaneously the bronze that produces when pulverizing;
(4) aqua regia dissolution is put into reactor with the golden foam that the material pulverized and step (1) obtain, and the slow adding chloroazotic acid of now joining constantly stirs, heating, replenishes simultaneously to add chloroazotic acid, until reaction finishes no longer to produce tobacco, leaves standstill, and obtains the chloroazotic acid gold;
(5) filter, with chloroazotic acid gold filter paper filtering, clean filter residue, filter residue again with the dissolving of chloroazotic acid secondary, is repeated to filter;
(6) reduction adds liquid caustic soda with the chloroazotic acid gold after filtering and regulates pH value to alkalescence, slowly adds hydrazine, until not in reaction, leave standstill, obtains cake of gold, and described cake of gold upper strata is supernatant liquor;
(7) clean, the supernatant liquor after step (6) is left standstill is poured out, and cleans cake of gold;
(8) pickling will place concentrated nitric acid to heat through the cake of gold that cleans, until the liquid clarification;
(9) clean, remove the reacted supernatant liquor of concentrated nitric acid, again clean cake of gold;
(10) oven dry will through the cake of gold oven dry of twice cleaning, be weighed after the cooling;
(11) ingot casting, the cake of gold after the oven dry is through induction furnace heat ingot casting.
Aforesaid gold net reclaims technique, through the material diameter＜5mm of step (3) pulverizing.
Aforesaid gold net reclaims technique, the reaction that described step (4) aqua regia dissolution occurs, and reaction formula is: Au+HNO
3+ 4HCl=HAcCl
4+ NO ↑+2H
2O.
Aforesaid gold net reclaims technique, and the pH value of solution is 12 ~ 15 behind the middle adding of described step (6) liquid caustic soda, is preferably 13.
Aforesaid gold net reclaims technique, and the concentrated nitric acid that adds in the described step (8) is the concentrated nitric acid of mass percent 68%.
Aforesaid gold net reclaims technique, and the volume of the concentrated nitric acid that adds in the described step (8) is 2 times of cake of gold.
Aforesaid gold net reclaims technique, and twice cleaning step of described step (7) and step (9) all uses hot water.
The invention has the beneficial effects as follows: the present invention reclaims the processing method of gold, operates fairly simplely, and less demanding to recovery system, the chloroazotic acid that uses simultaneously can not exert an influence to environment, when recycling gold to greatest extent, satisfies the requirement of protection of the environment.
Description of drawings
Fig. 1 is that the present invention's gold net reclaims process flow diagram.
Embodiment
The invention will be further described below by specific embodiments and the drawings, and embodiment limits but the present invention is not subjected to.
Gold net of the present invention reclaims technique, comprises the steps:
(1) clean, golden electrolysis net is weighed, record data with the golden foam of tap water flushing surface attachment, and are collected the golden foam that washes;
(2) oven dry is dried the golden electrolysis net of rinsing well with coal gas, weighs record data after the cooling;
(3) pulverize, with careful the breaking into pieces of hammer, the golden electrolysis net that will break into pieces is again pulverized with pulverizer with the golden electrolysis net after the oven dry, and material diameter is after crushed collected the bronze that produces when pulverizing simultaneously all less than 5mm;
(4) aqua regia dissolution is put into reactor with the golden foam that the material pulverized and step (1) obtain, slowly the adding chloroazotic acid of now joining, constantly stir, heat, replenish simultaneously the adding chloroazotic acid, until reaction finishes no longer to produce tobacco, leave standstill, obtain the chloroazotic acid gold, reaction formula is: Au+HNO
3+ 4HCl=HAcCl
4+ NO ↑+2H
2O;
(5) filter, with chloroazotic acid gold filter paper filtering, clean filter residue, filter residue again with the dissolving of chloroazotic acid secondary, is repeated to filter, reach the purpose that reclaims fully;
(6) reduction is put into the white bucket of 100L with the chloroazotic acid gold after filtering, at the bigger bucket of the outer surface cover of white bucket, in order to avoid the reaction fierceness is overflowed, add liquid caustic soda and regulate pH value to 13, slowly add hydrazine, until not in reaction, leave standstill, obtain cake of gold, the cake of gold upper strata is supernatant liquor;
(7) clean, the supernatant liquor after step (6) is left standstill is poured out, and with the cake of gold in the hot water cleaning barrels, until PH is between 7 ~ 8, supernatant liquor everywhere will be through detecting, and is discharging after satisfying emission standard;
(8) pickling, the cake of gold that cleaned add the 68% concentrated nitric acid heating that doubles the cake of gold volume again and boil the liquid clarification in white bucket, repeat several times, until liquid is limpid, (redgreen or yellow) removes the impurity such as trace copper, nickel;
(9) clean, remove the reacted supernatant liquor of concentrated nitric acid, the cake of gold in the hot water cleaning barrels is until PH7 ~ 8;
(10) oven dry, the cake of gold that has cleaned is placed in the Stainless Steel Kettle, and the gas range heating, drying is weighed after the cooling;
(11) ingot casting, the cake of gold after the oven dry is through induction furnace heat ingot casting.
The technological innovation that the present invention's gold net that above-mentioned structure like this consists of reclaims technique all has many saving graces for technician of the same trade now, and the progressive that really possesses skills.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet be not to limit the present invention, any those skilled in the art, within not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, any simple modification that foundation technical spirit of the present invention is done above embodiment, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (7)
1. a gold net reclaims technique, it is characterized in that the method comprises the steps:
(1) clean, golden electrolysis net is weighed, record data, the golden foam of flushing surface attachment, and collect the golden foam that washes;
(2) oven dry with the golden electrolysis net oven dry of rinsing well, is weighed record data after the cooling;
(3) pulverize, the golden electrolysis net after the oven dry is pulverized, collect simultaneously the bronze that produces when pulverizing;
(4) aqua regia dissolution is put into reactor with the golden foam that the material pulverized and step (1) obtain, and the slow adding chloroazotic acid of now joining constantly stirs, heating, replenishes simultaneously to add chloroazotic acid, until reaction finishes no longer to produce tobacco, leaves standstill, and obtains the chloroazotic acid gold;
(5) filter, with chloroazotic acid gold filter paper filtering, clean filter residue, filter residue again with the dissolving of chloroazotic acid secondary, is repeated to filter;
(6) reduction adds liquid caustic soda with the chloroazotic acid gold after filtering and regulates pH value to alkalescence, slowly adds hydrazine, until not in reaction, leave standstill, obtains cake of gold, and described cake of gold upper strata is supernatant liquor;
(7) clean, the supernatant liquor after step (6) is left standstill is poured out, and cleans cake of gold;
(8) pickling will place concentrated nitric acid to heat through the cake of gold that cleans, until the liquid clarification;
(9) clean, remove the reacted supernatant liquor of concentrated nitric acid, again clean cake of gold;
(10) oven dry will through the cake of gold oven dry of twice cleaning, be weighed after the cooling;
(11) ingot casting, the cake of gold after the oven dry is through induction furnace heat ingot casting.
2. gold net according to claim 1 reclaims technique, it is characterized in that, through the material diameter＜5mm of step (3) pulverizing.
3. gold net according to claim 1 reclaims technique, it is characterized in that, and the reaction that described step (4) aqua regia dissolution occurs, reaction formula is: Au+HNO
3+ 4HCl=HAcCl
4+ NO ↑+2H
2O.
4. gold net according to claim 1 reclaims technique, it is characterized in that, the pH value of solution is 12 ~ 15 behind the middle adding of described step (6) liquid caustic soda.
5. gold net according to claim 1 reclaims technique, it is characterized in that the concentrated nitric acid that adds in the described step (8) is the concentrated nitric acid of mass percent 68%.
6. gold net according to claim 1 reclaims technique, it is characterized in that, the volume of the concentrated nitric acid that adds in the described step (8) is 2 times of cake of gold.
7. gold net according to claim 1 reclaims technique, it is characterized in that twice cleaning step of described step (7) and step (9) all uses hot water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2013100561073A CN103074501A (en) | 2013-02-22 | 2013-02-22 | Gold net recovery process |
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|---|---|---|---|
| CN2013100561073A CN103074501A (en) | 2013-02-22 | 2013-02-22 | Gold net recovery process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404265A (en) * | 2014-12-02 | 2015-03-11 | 中条山有色金属集团有限公司 | Gold powder washing purification method |
| CN110983065A (en) * | 2019-12-23 | 2020-04-10 | 昆山全亚冠环保科技有限公司 | Method for reducing gold in iodine-containing waste liquid |
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| CN1237644A (en) * | 1998-05-28 | 1999-12-08 | 北京市理化分析测试中心 | New process for refining high-purity gold by wet method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404265A (en) * | 2014-12-02 | 2015-03-11 | 中条山有色金属集团有限公司 | Gold powder washing purification method |
| CN110983065A (en) * | 2019-12-23 | 2020-04-10 | 昆山全亚冠环保科技有限公司 | Method for reducing gold in iodine-containing waste liquid |
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Application publication date: 20130501 |