CN101665874A - Method for recycling gold from used printed electronic circuit board - Google Patents
Method for recycling gold from used printed electronic circuit board Download PDFInfo
- Publication number
- CN101665874A CN101665874A CN200910306941A CN200910306941A CN101665874A CN 101665874 A CN101665874 A CN 101665874A CN 200910306941 A CN200910306941 A CN 200910306941A CN 200910306941 A CN200910306941 A CN 200910306941A CN 101665874 A CN101665874 A CN 101665874A
- Authority
- CN
- China
- Prior art keywords
- gold
- aqueous solution
- tower
- volume
- organic phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- Y02P10/20—Recycling
Abstract
The invention relates to a method for recycling gold from a used printed electronic circuit board. The method comprises the following steps: taking a computer memory bank as experimental raw materialof gold extraction liquid; separating the goldfinger part of the memory bank; completely dissolving metal by an aqua regia solution to obtain a gold water solution; mixing methyl isobutyl ketone withthe gold water solution under the condition of the volume ratio of 0.4:1-1.2:1 at normal temperature, stirring for 5-15min, and standing to be steady; collecting an upper-layer gold-loaded organic phase after separating a lower-layer water solution in a separating funnel; and mixing the gold-loaded organic phase with an oxalic acid aqueous solution with the mass fraction of 5-10 percent under thecondition of the volume ratio of 0.6:1-1.2:1, carrying out rectification and backextraction process, keeping the low temperature of a tower at 110 DEG C, controlling the reflux ratio at 1:3-3:1, obtaining regeneration of MIBK at tower top, and acquiring black solid gold at a tower kettle. The method realizes high-efficiency separation of gold in the circuit board, has simple operation, low energyconsumption and stronger practicability, and is an economical and feasible chemical recycling technology; and the reagent can be circularly used.
Description
Technical field
The resource utilization that the present invention relates to electron wastes is recycled, and particularly reclaims the method for gold in the waste and old printing electronic circuit.
Background technology
Along with the rapid increase of electronic product and the continuous quickening of renewal rate, domestic electronic waste generation also sharply increases.Discarded circuit board quantity is big, potential value is high and environmental hazard is big etc., and characteristics make the discarded circuit board resource utilization have important recovery value and environment protection meaning.The author has carried out the experimental study of stripping to the metal ingredient in the electric PC board, contains a certain amount of gold in studies show that on the acupuncture needle of the golden finger of wiring board and CPU, and recovery value is arranged, and can gather in the crops considerable benefit.
The patented technology that reclaims gold mainly is at gold mine, and the recovery of gold yet there are no report in delivering in the patent waste printed circuit board.The content of gold is low in the waste printed circuit board, and massfraction is about 0.1%～1%.At the special system of wiring board, methods such as numerous scholar's spent ion exchange resin methods, solvent extration and electrochemistry are studied the gold that extracts in the wiring board.
Ion exchange resin is a kind of functional high molecule material that contains ion-exchange group in cross-linked polymer structures.Its fundamental characteristics is that its skeleton or carrier are cross-linked polymers, thereby any solvent all can not make its dissolving, can not make its fusion; On the polymkeric substance with functional group can ionization.Ion exchange resin is applied to the purifying and the wastewater treatment of water the earliest, because its adsorption selectivity is good, physical and chemical stability is high, the characteristics such as reusable of easily regenerating, the extracting process that can be used as a kind of environmental protection is applied in the extracting and separating of precious metal.
Solvent-extracted essence is with solvent metal simple extracting and separating from solution to be come out, again through back extraction dilution, acidifying precipitate reduction metal.For realizing separating between metal target and other metals, at first to select suitable extraction agent.Extraction agent in the hydrometallurgy industry is that a kind of metal ion can the reaction by fiting chemical optionally change organic phase over to from water, can forward water to from organic phase by the reaction of another kind of fiting chemical again, so as to the purifying that reaches metal and the organic compound of enrichment.This class organic compound had both had the reaction active groups that can cooperate with precious metal ion, and having again to increase oil-soluble hydrophobic grouping.
Electrochemical process be since different metal ion in electrolytic solution by different current potentials can be respectively with the form of simple substance form or alloy under cathodic deposition, therefore may test the separation of metal by controlling electrolysis voltage or current density.The method of electrochemical deposition does not need extra solvent, and the condition of controlling well can obtain highly purified metal, and this method equipment is simple, process cost is low, has great prospects for development.Because there is coprecipitated phenomenon in metal electrodeposition, and the conditional request of operation control is relatively stricter, therefore need further further investigation, to seek adaptability deposition rule widely, under the higher prerequisite of the rate of recovery, guarantee metal simple-substance purity and current efficiency, and electrochemical process there is higher requirement to the concentration of metal target, if ionic concn is too low, will cause serious coprecipitated phenomenon.
Summary of the invention
Purpose of the present invention is exactly to utilize problem again for what solve old electronic printed circuit board, in conjunction with the industrialization prospect of carrying technology for gold, the method that provides the combination technology of solvent extration and rectifying reverse-extraction method to reclaim gold in the old electronic printed circuit board, be a kind of under the very low condition of Gold Content the method for high efficiency separating and recovering gold.
The present invention mainly studies the performance of hexone MIBK extraction agent extracting gold and the process that MIBK and solid-state gold are reclaimed in oxalic acid rectifying back extraction.MIBK originates sufficient, and the suitability for industrialized production amount is big, low price; Solubleness in water is very little, only is 2%; The chemical stability of MIBK is good, is difficult for degraded; When mixing, can not generate emulsification with water; Bigger loading capacity is arranged, and MIBK can reach 90.5g/L to the loading capacity of gold; Selectivity to gold is good, and base metal is not extracted by MIBK; Easily by the oxalic acid back extraction, regenerability is good; Extraction equilibrium speed is fast, just can extract in 15 minutes fully.This method has realized the high efficiency separation of gold in the wiring board, and simple to operate, energy consumption is low, and reagent can recycle, and is economically viable chemical recovery technology, has stronger practicality.
The working method of the gold in the recovery old electronic printed circuit board of the present invention comprises the steps:
I. power taking brain memory bar is the experimental raw of golden extraction liquid: at first partly break away from the method for the physics fragmentation golden finger with memory bar, with wang aqueous solution metal is all dissolved, obtain the aqueous solution of gold, the present invention be applicable to pH value scope 1.0～3.0, the gold ion concentration range is at the aqueous solution of 0.001～0.5g/L;
Ii. under the volume of the aqueous solution of the volume ratio gold of hexone is 0.4: 1～1.2: 1 condition, the two is mixed in Erlenmeyer flask at normal temperatures, with mechanical stirring equipment stir be placed in 5～15 minutes leave standstill in the pear shape separatory funnel stable after;
Iii. after the lower aqueous solution in the separating funnel being separated, collect the upper strata and carry golden organic phase;
Iv. be that the volume of 5%～10% oxalic acid aqueous solution is under 0.6: 1 ~ 1.2: 1 the condition at the volume ratio massfraction that carries golden organic phase, the two is mixed in the distilling flask of rectifying tower device, carry out rectifying back extraction process, keeping the tower low temperature is 110 ℃, the control reflux ratio was at 1: 3～3: 1, in the regeneration of cat head acquisition MIBK, obtain the gold of black solid at the tower still;
V. the solid-state gold that obtains after the rectifying obtains highly purified solid-state gold further through pickling, fusing, ingot casting.
The schema of rectifier unit as shown in Figure 1.
It is raw material that rectifying column adopts glass column, the high 1000mm of tower body, and diameter 30mm, filling diameter in the tower body is that 2mm, length are the glass filler of 6mm.Reactant is put into distilling flask by charging opening, control the temperature of reactant with heating jacket, thermometer has shown the temperature of reactant in the distilling flask.Reactant is realized rectifying in tower body, the thermometer of tower head is used for the temperature of tower head.The steam of tower head is cooled after the water cooling, and a part is along with the pendulum that is attracted by electro-magnet enters receiving bottle, and a part is back to tower body.So repeatedly, the reactant in distilling flask all steams.
The gold that present method is produced is to be main raw material with the metal in the old electronic printed circuit board, produces and gets through solvent extraction rectifying reverse-extraction method.Solvent extration has utilized gold preferential bonded principle in organic phase that gold is extracted into the organic phase from aqueous phase, and the rectifying reverse-extraction method has utilized the reductibility of oxalic acid that the ionic state of gold from carry golden organic phase is reduced to the simple substance attitude.Solvent extraction-rectifying reverse-extraction method utilizes rectifying and the technology that the back extraction process combines, and has realized the synchronous process of regeneration with the efficient purification of gold of MIBK, has saved the time and the energy, all has tangible advantage in metal separation with aspect preventing the pollution of the environment.
Description of drawings
Fig. 1: rectifier unit synoptic diagram.
Embodiment
The schema of rectifier unit as shown in Figure 1.
It is raw material that rectifying column adopts glass column, the high 1000mm of tower body, and diameter 30mm, filling diameter in the tower body is that 2mm, length are the glass filler of 6mm.Reactant is put into distilling flask by charging opening, control the temperature of reactant with heating jacket, thermometer has shown the temperature of reactant in the distilling flask.Reactant is realized rectifying in tower body, the thermometer of tower head is used for the temperature of tower head.The steam of tower head is cooled after the water cooling, and a part is along with the pendulum that is attracted by electro-magnet enters receiving bottle, and a part is back to tower body.So repeatedly, the reactant in distilling flask all steams.
The working method of the gold in the recovery old electronic printed circuit board of the present invention comprises the steps:
Vi. power taking brain memory bar is the experimental raw of golden extraction liquid: at first partly break away from the method for the physics fragmentation golden finger with memory bar, with wang aqueous solution metal is all dissolved, obtain the aqueous solution of gold, the present invention be applicable to pH value scope 1.0～3.0, the gold ion concentration range is at the aqueous solution of 0.001～0.5g/L;
Vii. under the volume of the aqueous solution of the volume ratio gold of hexone is 0.4: 1～1.2: 1 condition, the two is mixed in Erlenmeyer flask at normal temperatures, with mechanical stirring equipment stir be placed in 5～15 minutes leave standstill in the pear shape separatory funnel stable after;
Viii. after the lower aqueous solution in the separating funnel being separated, collect the upper strata and carry golden organic phase;
Ix. be that the volume of 5%～10% oxalic acid aqueous solution is under 0.6: 1 ~ 1.2: 1 the condition at the volume ratio massfraction that carries golden organic phase, the two is mixed in the distilling flask of rectifying tower device, carry out rectifying back extraction process, keeping the tower low temperature is 110 ℃, the control reflux ratio was at 1: 3～3: 1, in the regeneration of cat head acquisition MIBK, obtain the gold of black solid at the tower still;
X. the solid-state gold that obtains after the rectifying obtains highly purified solid-state gold further through pickling, fusing, ingot casting.
Embodiment 1
1. power taking brain memory bar is the experimental raw of golden extraction liquid: at first partly break away from the method for the physics fragmentation golden finger with memory bar, with wang aqueous solution metal is all dissolved, obtain the aqueous solution of gold, regulate its pH value and be 1.0, gold ion concentration is the aqueous solution of 0.001g/L;
2. under the volume of the aqueous solution of the volume ratio gold of hexone (MIBK) is 0.4: 1 condition, the volume of getting MIBK is 80mL, the volume of the aqueous solution of gold is 200mL, the two is mixed in Erlenmeyer flask at normal temperatures, is to stir under the 50r/min to be placed in 5 minutes to leave standstill stable layering in the pear shape separatory funnel with the mechanical stirrer low whipping speed;
3. the supernatant liquor after the layering promptly being carried golden organic phase takes out, the volume that at the volume ratio massfraction that carries golden organic phase is 5% oxalic acid aqueous solution is under 0.6: 1 the condition, the volume of getting oxalic acid aqueous solution is 133mL, the two is mixed in the distilling flask of rectifying tower device, Heating temperature to 110 ℃, the control reflux ratio is 1: 3 behind the total reflux 10min, carries out the back extraction process of gold at rectifying tower, obtain the solid-state gold of black behind the back extraction end of processing, the rate of recovery of gold is 93%;
4. the black solid gold that step 3 is obtained carries out pickling with concentrated nitric acid, washes again, filters and obtains spongiform gold, and purity is 99%.
Embodiment 2
1. power taking brain memory bar is the experimental raw of golden extraction liquid: at first partly break away from the method for the physics fragmentation golden finger with memory bar, with wang aqueous solution metal is all dissolved, obtain the aqueous solution of gold, regulate its pH value and be 2.0, gold ion concentration is the aqueous solution of 0.015g/L;
2. under the volume of the aqueous solution of the volume ratio gold of MIBK is 0.6: 1 condition, the volume of getting MIBK is 120mL, the volume of the aqueous solution of gold is 200mL, the two is mixed in Erlenmeyer flask at normal temperatures, is to stir under the 60r/min to be placed in 10 minutes to leave standstill stable layering in the pear shape separatory funnel with the mechanical stirrer low whipping speed;
3. the supernatant liquor after the layering promptly being carried golden organic phase takes out, the volume that at the volume ratio massfraction that carries golden organic phase is 7% oxalic acid aqueous solution is under 0.8: 1 the condition, the volume of getting oxalic acid aqueous solution is 150mL, the two is mixed in the distilling flask of rectifying tower device, Heating temperature to 110 ℃, the control reflux ratio is 1: 2 behind the total reflux 10min, carries out the back extraction process of gold at rectifying tower, obtain the solid-state gold of black behind the back extraction end of processing, the rate of recovery of gold is 93.8%;
4. the black solid gold that step 3 is obtained carries out pickling with concentrated nitric acid, washes again, filters and obtains spongiform gold, and purity is 99.2%.
Embodiment 3
1. power taking brain memory bar is the experimental raw of golden extraction liquid: at first partly break away from the method for the physics fragmentation golden finger with memory bar, with wang aqueous solution metal is all dissolved, obtain the aqueous solution of gold, regulate its pH value and be 3.0, gold ion concentration is the aqueous solution of 0.1g/L;
2. under the volume of the aqueous solution of the volume ratio gold of MIBK is 1: 1 condition, the volume of getting MIBK is 200mL, the volume of the aqueous solution of gold is 200mL, the two is mixed in Erlenmeyer flask at normal temperatures, is to stir under the 50r/min to be placed in 10 minutes to leave standstill stable layering in the pear shape separatory funnel with the mechanical stirrer low whipping speed;
3. the supernatant liquor after the layering promptly being carried golden organic phase takes out, the volume that at the volume ratio massfraction that carries golden organic phase is 8% oxalic acid aqueous solution is under 1: 1 the condition, the volume of getting oxalic acid aqueous solution is 200mL, the two is mixed in the distilling flask of rectifying tower device, Heating temperature to 110 ℃, the control reflux ratio is 1: 1 behind the total reflux 10min, carries out the back extraction process of gold at rectifying tower, obtain the solid-state gold of black behind the back extraction end of processing, the rate of recovery of gold is 98.8%;
4. the black solid gold that step 3 is obtained carries out pickling with concentrated nitric acid, washes again, filters and obtains spongiform gold, and purity is 99.5%.
Embodiment 4
1. power taking brain memory bar is the experimental raw of golden extraction liquid: at first partly break away from the method for the physics fragmentation golden finger with memory bar, with wang aqueous solution metal is all dissolved, obtain the aqueous solution of gold, regulate its pH value and be 3.0, gold ion concentration is the aqueous solution of 0.5g/L;
2. under the volume of the aqueous solution of the volume ratio gold of MIBK is 1.2: 1 condition, the volume of getting MIBK is 240mL, the volume of the aqueous solution of gold is 200mL, the two is mixed in Erlenmeyer flask at normal temperatures, is to stir under the 100r/min to be placed in 15 minutes to leave standstill stable layering in the pear shape separatory funnel with the mechanical stirrer low whipping speed;
3. the supernatant liquor after the layering promptly being carried golden organic phase takes out, the volume that at the volume ratio massfraction that carries golden organic phase is 10% oxalic acid aqueous solution is under 1.2: 1 the condition, the volume of getting oxalic acid aqueous solution is 200mL, the two is mixed in the distilling flask of rectifying tower device, Heating temperature to 110 ℃, the control reflux ratio is 3: 1 behind the total reflux 10min, carries out the back extraction process of gold at rectifying tower, obtain the solid-state gold of black behind the back extraction end of processing, the rate of recovery of gold is 95.8%.
4. the black solid gold that step 3 is obtained carries out pickling with concentrated nitric acid, washes again, filters and obtains spongiform gold, and purity is 99.2%.
The method of gold in the waste and old printing electronic circuit of recovery that the present invention proposes, be described by embodiment, person skilled obviously can be in not breaking away from content of the present invention, spirit and scope to product as herein described with making method is changed or suitably change and combination, realize technology of the present invention.Special needs to be pointed out is, the replacement that all are similar and change apparent to those skilled in the artly, they are regarded as being included in spirit of the present invention, scope and the content.
Claims (1)
1. a method that reclaims gold in the waste and old printing electronic circuit is characterized in that comprising the steps:
I. power taking brain memory bar is the experimental raw of golden extraction liquid: at first partly break away from the method for the physics fragmentation golden finger with memory bar, with wang aqueous solution metal is all dissolved, obtain the aqueous solution of gold, regulate pH value of aqueous solution and be 1.0～3.0, gold ion concentration is 0.001～0.5g/L;
Ii. under the volume of the aqueous solution of the volume ratio gold of hexone is 0.4: 1～1.2: 1 condition, the two is mixed in Erlenmeyer flask at normal temperatures, with mechanical stirring equipment stir be placed in 5～15 minutes leave standstill in the pear shape separatory funnel stable after;
Iii. after the lower aqueous solution in the separating funnel being separated, collect the upper strata and carry golden organic phase;
Iv. be that the volume of 5%～10% oxalic acid aqueous solution is under 0.6: 1 ~ 1.2: 1 the condition at the volume ratio massfraction that carries golden organic phase, the two is mixed in the distilling flask of rectifying tower device, carry out rectifying back extraction process, keeping the tower low temperature is 110 ℃, the control reflux ratio was at 1: 3～3: 1, in the regeneration of cat head acquisition MIBK, obtain the gold of black solid at the tower still;
V. the solid-state gold that obtains after the rectifying obtains highly purified solid-state gold further through pickling, fusing, ingot casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910306941A CN101665874A (en) | 2009-09-14 | 2009-09-14 | Method for recycling gold from used printed electronic circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910306941A CN101665874A (en) | 2009-09-14 | 2009-09-14 | Method for recycling gold from used printed electronic circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101665874A true CN101665874A (en) | 2010-03-10 |
Family
ID=41802651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910306941A Pending CN101665874A (en) | 2009-09-14 | 2009-09-14 | Method for recycling gold from used printed electronic circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101665874A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108165743A (en) * | 2017-12-28 | 2018-06-15 | 郴州雄风环保科技有限公司 | A kind of full extraction and separation prepare high-purity Au, Pt, Pd technology |
-
2009
- 2009-09-14 CN CN200910306941A patent/CN101665874A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108165743A (en) * | 2017-12-28 | 2018-06-15 | 郴州雄风环保科技有限公司 | A kind of full extraction and separation prepare high-purity Au, Pt, Pd technology |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101392325B (en) | Method for extracting gold from waste printed circuit board | |
| CN101914785B (en) | Method for recycling silver and copper from silver-copper alloy scrap | |
| CN105256150B (en) | A kind of method that rubidium caesium is extracted from acid bittern | |
| CN102145256B (en) | Method for separating boron isotopes by simulated moving bed chromatography | |
| Lee et al. | Resource recovery of scrap silicon solar battery cell | |
| CN104889140A (en) | Processing method for waste printed circuit board | |
| CN101597769B (en) | Normal temperature and pressure quick desorption electrolysis method of gold loaded carbon | |
| CN104388987A (en) | Method for preparing copper powder from metal powder of waste printed circuit boards by means of electrolysis | |
| Siwal et al. | A review on electrochemical techniques for metal recovery from waste resources | |
| CN103540748B (en) | A kind of metal of waste printed circuit board substrate and nonmetallic separation method | |
| CN103421956A (en) | Technology for recycling platinum and palladium from acid solution containing low concentration of platinum family precious metals by adopting reducing precipitation method | |
| Luyima et al. | Leaching studies for metals recovery from waste printed wiring boards | |
| CN102286664B (en) | Method for extracting copper from organic silicon chemical waste residue and recovering extraction liquid | |
| Cho et al. | Korea’s metal resources recycling research project–valuable recycling | |
| CN106145465B (en) | Electrodeionization-electrodeposition process reuse cyanidation gold-extracted tail washings device and method | |
| CN101665874A (en) | Method for recycling gold from used printed electronic circuit board | |
| CN102240663A (en) | Method for separating and recycling rare noble metals and waste plastics in waste circuit board | |
| CN103334013A (en) | Novel leaching process of extracting precious metals such as gold, silver and the like from silver separating residues | |
| CN104178629A (en) | Method of recovering valuable metals from waste electronic circuit board multi-metal powder | |
| CN105483375B (en) | A kind of method for improving copper efficiency in Microorganism Leaching printed substrate using NCNTs modification carbon electrodes | |
| CN104910379A (en) | Preparation method of amino group-containing porous material, and application of amino group-containing porous material in recover of waste electric appliance precious metals | |
| Li et al. | Copper recovery from waste printed circuit boards and the correlation of Cu, Pb, Zn by ionic liquid | |
| CN110306070A (en) | A kind of extracting process of indium | |
| CN112708781B (en) | Method for recovering metal Sn from waste circuit board by adopting efficient Sn-removing medicament | |
| CN105132691B (en) | A kind of method that metallic copper is extracted from waste printed circuit board |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100310 |