US1415526A - Process for recovering selenium and noble metals from electrolytic slimes and the like - Google Patents
Process for recovering selenium and noble metals from electrolytic slimes and the like Download PDFInfo
- Publication number
- US1415526A US1415526A US32773619A US1415526A US 1415526 A US1415526 A US 1415526A US 32773619 A US32773619 A US 32773619A US 1415526 A US1415526 A US 1415526A
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- US
- United States
- Prior art keywords
- noble metals
- selenium
- metals
- lead
- same
- 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.)
- Expired - Lifetime
Links
- 229910000510 noble metal Inorganic materials 0.000 title description 33
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 title description 23
- 229910052711 selenium Inorganic materials 0.000 title description 23
- 239000011669 selenium Substances 0.000 title description 23
- 238000000034 method Methods 0.000 title description 17
- 229910052751 metal Inorganic materials 0.000 description 17
- 125000004354 sulfur functional group Chemical group 0.000 description 13
- 239000000463 material Substances 0.000 description 11
- 239000003513 alkali Substances 0.000 description 10
- 229910052783 alkali metal Inorganic materials 0.000 description 7
- 150000001340 alkali metals Chemical class 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 230000004907 flux Effects 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 229910000978 Pb alloy Inorganic materials 0.000 description 4
- 230000004927 fusion Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 229910052714 tellurium Inorganic materials 0.000 description 3
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 150000001339 alkali metal compounds Chemical class 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 239000003518 caustics Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000003500 flue dust Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- JUWSSMXCCAMYGX-UHFFFAOYSA-N gold platinum Chemical compound [Pt].[Au] JUWSSMXCCAMYGX-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- -1 on the one hand Inorganic materials 0.000 description 1
- QYHFIVBSNOWOCQ-UHFFFAOYSA-N selenic acid Chemical class O[Se](O)(=O)=O QYHFIVBSNOWOCQ-UHFFFAOYSA-N 0.000 description 1
- 229940082569 selenite Drugs 0.000 description 1
- MCAHWIHFGHIESP-UHFFFAOYSA-L selenite(2-) Chemical compound [O-][Se]([O-])=O MCAHWIHFGHIESP-UHFFFAOYSA-L 0.000 description 1
- 150000003346 selenoethers Chemical class 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 235000010269 sulphur dioxide Nutrition 0.000 description 1
- 239000004291 sulphur dioxide Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/02—Obtaining noble metals by dry processes
- C22B11/021—Recovery of noble metals from waste materials
- C22B11/023—Recovery of noble metals from waste materials from pyrometallurgical residues, e.g. from ashes, dross, flue dust, mud, skim, slag, sludge
-
- 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
Definitions
- RTE D STATES PAET MASUIMI GmASHIG-E AND DENZO UN'O, OF KYOTO, JAPAN.
- This invention relates to a process for extracting non-metallic elements of the sulphur grou and the noble metals, such as silver, gol platinum and the like, from refuses, for example, electrolytic slimes, mattes and fluedust, produced in refining copper, silver, gold platinum and similar metals.
- This invention consists in completely separating-selenium and other elements of the sulphur group and the noble metals from each other, and in bringing elements in both groups by the same operation into such forms as render them readily recoverable. Separating the two groups and at the same time bringing thehelements in both groups into easily recoverable form has, so far as we know, been impossible in any known process heretofore used.
- the process consists in fusing a mixture containing the non-metallic elements of the sulphur group and the noble metals with reagents capable of effecting a separation of these constituents from each other, in fusion products of different specific gravities insoluble in each other, andrecovering from the fusion-products the valuable contents.
- This may 'beattained by fusionwith a collector of the noble metals, preferably lead, and an alkali metal compound: Suitablealkali metal compounds are the caustic alka-- lies and the alkali carbonates and nitratesa Alkali metal compounds of this character are generically designated by the expression an alkali metal flux.
- the material will constitute-the bottomlayer in the form of a lead alloy or alloys while selenium and the like, forming compounds with the alkali-metals, will float and form the uppermost layer.
- the remaining metals together with other metallic salts will constitute the middle layer.
- the object of this invention is to provide a very simple, efficient and-inexpensive process whereb all the selenium and other elements of t e sulphur group and the noble metals contained in the materials treated,
- electrolytic slime which usuall contains selenium, silver and gold as wel as a small proportion of copper
- one or more of the caustic alkalies, alkali carbonates or nitrates is added to the slime in such quantity as is sufficient, or more than sufiicient to convert the whole of the selenium contained in the slime into alkali compounds of selenium.
- lead is also added to the slime in such av proportion as to form an alloy with the noble metal contained therein.
- the addition of the same may be entirely omitted or the amount decreased in proportion to the lead-contents of the slime,
- the ingredients are carefully mixed and subjected for two or three hours to a suitable temperature, preferably 800-900 0., which will vary according to the amount of selenium and alkalies present. It is understood that the temperature and time factors will vary somewhat with the character of the material under treatment. lVhen the chemical reaction is completed, the fused substances naturally separate into three layers according to the difference of specific gravities of the respective fusion-products.
- the noble metals converted into lead al-" loys will form the undermost or bottom layer together with a portion of copper if the same is present in the original material treated.
- the alkali selenides, selenites or selenates will form the uppermost or surface layer, while the middle layer will be composed of residual copper and other metallic salts in case copper or other metals are contained in the material originally treated.
- the function of the lead is simply to form alloys with the noble metals which are present in the free state during fusion.
- the separation of gold and other noble metals may be accomplished by any well known process for example, cupellation.
- Tellurium may often occur associated withselenium in the slime and if present passes into the surface layer together with selenium and other non-metallic elements.
- tellurium is precipitated at the same time as selenium. Separation of tellurium and selenium may be effected by any of the known processes.
- the process of this invention may be applied to mattes and flue dust in exactly the same manner as in the case of eletrolytic slimes except that the mattes must be finely pulverized before alkalies are added to the same.
- a process for treating material containing non-metallic elements of the sulphur group and the noble metals comprising fusing the same in the presence of lead and an alkali metal flux and recovering the nonmetallic elements of the sulphur group and the noble metals from the fusion-products.
- a process for treating material containing non-metallic elements of the sulphur group and the noble metals comprising fusing the same in the presence of lead anda sodium flux, and recovering the nonmetallic elements of the sulphur group and the noblemetals from the fusionsproducts.
- Lamaze 4 A process 'for treating material containing selenium and the noble metals, com prising fusing the same in the presence of a collector of the noble metals and an alkali 5 metal flux and recovering the selenium and the noble metals from the fusion-products.
- a process for treating material containing selenium and the noble metals comprising fusing the same in the presence of lead and an alkali metal flux, and recover- 10 ing the selenium and the noble metals from the fusion-products.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
RTE D. STATES PAET MASUIMI GmASHIG-E AND DENZO UN'O, OF KYOTO, JAPAN.
PROCESS FOR REGOVEAING SELENIUM AN'D NOBLE METALS FROM ELECTROLYTIC SLIMES AND THE LIKE.
No Drawing.
Kamikyo-ku', Kyoto, Japan, both J apanese' subjects, have invented certain new and useful'Improvements in and Relating to a Process for Recovering Selenium and Noble Metals from Electrolytic Slimes and the like; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.
This invention relates to a process for extracting non-metallic elements of the sulphur grou and the noble metals, such as silver, gol platinum and the like, from refuses, for example, electrolytic slimes, mattes and fluedust, produced in refining copper, silver, gold platinum and similar metals.
This invention consists in completely separating-selenium and other elements of the sulphur group and the noble metals from each other, and in bringing elements in both groups by the same operation into such forms as render them readily recoverable. Separating the two groups and at the same time bringing thehelements in both groups into easily recoverable form has, so far as we know, been impossible in any known process heretofore used.
The process consists in fusing a mixture containing the non-metallic elements of the sulphur group and the noble metals with reagents capable of effecting a separation of these constituents from each other, in fusion products of different specific gravities insoluble in each other, andrecovering from the fusion-products the valuable contents. This may 'beattained by fusionwith a collector of the noble metals, preferably lead, and an alkali metal compound: Suitablealkali metal compounds are the caustic alka-- lies and the alkali carbonates and nitratesa Alkali metal compounds of this character are generically designated by the expression an alkali metal flux. When the fusion is completed the mass naturally divides itself into three layers or zones according to the difference of specific gravities of its constituents. All the noble metals contained in Specification of Letters Patent.
recover both at the same time. to this invention it is possible to recover the Patented May 9, 1922.
Application filed October 1, 1919. Serial No. 327,736.
the material, will constitute-the bottomlayer in the form of a lead alloy or alloys while selenium and the like, forming compounds with the alkali-metals, will float and form the uppermost layer. The remaining metals together with other metallic salts will constitute the middle layer.
The object of this invention is to provide a very simple, efficient and-inexpensive process whereb all the selenium and other elements of t e sulphur group and the noble metals contained in the materials treated,
may be extracted and completely recovered in elemental form.
If selenium or other elements of the sulphur group are contained'even in a tracein any noble metal, the good 'quality of such metal is damaged' The removal of such impurity during refining is, therefore, a matter of great importance.
Since selenium and like elements have strong chemical ailinity for the noble metals, and as they appearin the same group with the latter in course'of analysis, it has hitherto been practically impossible to separate the non-metallic elements and the noble metals one from the other, in such a manner as to According non-metallic elements of the sulphur group and the noble metals from a mixture containing the same without substantial loss of any of the constituents. This is realized by utilizing the following properties in combination, namely, (1) prominent chemical af- .finitybetween non-metallic elements of sulphur group and alkali-metals, (2) easy formation of alloys of lead with noble metals, I
and natural separation of non-metallic elements of sulphur group combined with alkali-metals, on the one hand, and alloys of lead with noble metals, on the other, accord ing to thedifi'erence of specific gravities of the products in the fused state.
. In order that the invention may be ea sily v understood, an application of the process for extracting and recovering the element selenium and the noble metals from an electrolytic slime produced in copper refining, will now be described and illustrated, by way of example.
In carrying out the process for example, with electrolytic slime which usuall contains selenium, silver and gold as wel as a small proportion of copper, one or more of the caustic alkalies, alkali carbonates or nitrates, is added to the slime in such quantity as is sufficient, or more than sufiicient to convert the whole of the selenium contained in the slime into alkali compounds of selenium. .At the same time, lead is also added to the slime in such av proportion as to form an alloy with the noble metal contained therein. If lead is present in the slime used, the addition of the same may be entirely omitted or the amount decreased in proportion to the lead-contents of the slime, The ingredients are carefully mixed and subjected for two or three hours to a suitable temperature, preferably 800-900 0., which will vary according to the amount of selenium and alkalies present. It is understood that the temperature and time factors will vary somewhat with the character of the material under treatment. lVhen the chemical reaction is completed, the fused substances naturally separate into three layers according to the difference of specific gravities of the respective fusion-products.
The noble metals converted into lead al-" loys will form the undermost or bottom layer together with a portion of copper if the same is present in the original material treated.
The alkali selenides, selenites or selenates will form the uppermost or surface layer, while the middle layer will be composed of residual copper and other metallic salts in case copper or other metals are contained in the material originally treated.
Chemical reactions occuring during the fusion, may be represented by the following equation where, for brevity, it is assumed that the noble metal present is silver only 1. When caustic soda is used:
2. Then sodium carbonate is used 3. When sodium nitrate is used:
It is understood that similar reactions will occur if gold, platinum or other metals of this group are present in the material undergoing treatment.
The function of the lead is simply to form alloys with the noble metals which are present in the free state during fusion.
The separation of gold and other noble metals may be accomplished by any well known process for example, cupellation.
In order to recover the selenium from the surface layer-mass the latter is dissolved in water and an acid, for example, sulphuric or hydrochloric, added thereto to neutralize the excess alkali, after which air is passed through the solution to precipitate the selenium present. This-reaction may be represented by the following equation Selenium may still remain as selenite or selenate in the solution. It may be reduced to elementary form by passing sulphur-dioxide .through the acidified solution, and this reaction may be represented by the following equation Na,SeO,+2SO +H O:Se-l-2NaHSO,
Tellurium may often occur associated withselenium in the slime and if present passes into the surface layer together with selenium and other non-metallic elements.
When the surface layer is treated in the manner stated above, tellurium is precipitated at the same time as selenium. Separation of tellurium and selenium may be effected by any of the known processes.
The process of this invention may be applied to mattes and flue dust in exactly the same manner as in the case of eletrolytic slimes except that the mattes must be finely pulverized before alkalies are added to the same.
We claim 1. A process for treating material containing non-metallic elements of the sulphur group and the noble metals, compris-.
ing fusing the same in the presence of a collector of the noble metals and an alkali metal flux, and recovering the non-metallic elements of the sulphur group and the noble metals from the fusion-products.
2. A process for treating material containing non-metallic elements of the sulphur group and the noble metals, comprising fusing the same in the presence of lead and an alkali metal flux and recovering the nonmetallic elements of the sulphur group and the noble metals from the fusion-products.
3. A process for treating material containing non-metallic elements of the sulphur group and the noble metals, comprising fusing the same in the presence of lead anda sodium flux, and recovering the nonmetallic elements of the sulphur group and the noblemetals from the fusionsproducts.
Lamaze 4. A process 'for treating material containing selenium and the noble metals, com prising fusing the same in the presence of a collector of the noble metals and an alkali 5 metal flux and recovering the selenium and the noble metals from the fusion-products.
5. A process for treating material containing selenium and the noble metals, comprising fusing the same in the presence of lead and an alkali metal flux, and recover- 10 ing the selenium and the noble metals from the fusion-products.
In testimony whereof, we afiix our signatures.
MASUMI GHIKASHIGE.
DENZO UNO.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US32773619 US1415526A (en) | 1919-10-01 | 1919-10-01 | Process for recovering selenium and noble metals from electrolytic slimes and the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US32773619 US1415526A (en) | 1919-10-01 | 1919-10-01 | Process for recovering selenium and noble metals from electrolytic slimes and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1415526A true US1415526A (en) | 1922-05-09 |
Family
ID=23277816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US32773619 Expired - Lifetime US1415526A (en) | 1919-10-01 | 1919-10-01 | Process for recovering selenium and noble metals from electrolytic slimes and the like |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1415526A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2474966A (en) * | 1941-05-01 | 1949-07-05 | Hartford Nat Bank & Trust Co | Method of preparing selenium |
| US2816008A (en) * | 1955-12-06 | 1957-12-10 | American Smelting Refining | Recovery of selenium from scrap selenium rectifiers |
| US2835558A (en) * | 1955-08-09 | 1958-05-20 | Diamond Alkali Co | Recovery of selenium |
| US2981595A (en) * | 1958-10-27 | 1961-04-25 | Phelps Dodge Corp | Recovery of tellurium |
| US3899322A (en) * | 1972-06-20 | 1975-08-12 | Rockwell International Corp | Noble-type metal recovery process by use of molten salt bath |
| US3928549A (en) * | 1974-06-20 | 1975-12-23 | Us Energy | Thermochemical production of hydrogen |
| EP0176491A1 (en) * | 1984-09-28 | 1986-04-02 | Boliden Aktiebolag | A method for recovering precious metals |
| CN101857921B (en) * | 2009-04-13 | 2012-05-30 | 欣伟科技股份有限公司 | Devices for recovering precious metals |
| CN101851703B (en) * | 2009-04-03 | 2012-06-27 | 欣伟科技股份有限公司 | Devices for recovering precious metals |
| EP1577408B2 (en) † | 2002-11-29 | 2013-12-11 | Mitsubishi Materials Corporation | Method for separating platinum group elements from selenum/tellurium bearing materials |
-
1919
- 1919-10-01 US US32773619 patent/US1415526A/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2474966A (en) * | 1941-05-01 | 1949-07-05 | Hartford Nat Bank & Trust Co | Method of preparing selenium |
| US2835558A (en) * | 1955-08-09 | 1958-05-20 | Diamond Alkali Co | Recovery of selenium |
| US2816008A (en) * | 1955-12-06 | 1957-12-10 | American Smelting Refining | Recovery of selenium from scrap selenium rectifiers |
| US2981595A (en) * | 1958-10-27 | 1961-04-25 | Phelps Dodge Corp | Recovery of tellurium |
| US3899322A (en) * | 1972-06-20 | 1975-08-12 | Rockwell International Corp | Noble-type metal recovery process by use of molten salt bath |
| US3928549A (en) * | 1974-06-20 | 1975-12-23 | Us Energy | Thermochemical production of hydrogen |
| EP0176491A1 (en) * | 1984-09-28 | 1986-04-02 | Boliden Aktiebolag | A method for recovering precious metals |
| US4613365A (en) * | 1984-09-28 | 1986-09-23 | Boliden Aktiebolag | Method for recovering precious metals |
| EP1577408B2 (en) † | 2002-11-29 | 2013-12-11 | Mitsubishi Materials Corporation | Method for separating platinum group elements from selenum/tellurium bearing materials |
| CN101851703B (en) * | 2009-04-03 | 2012-06-27 | 欣伟科技股份有限公司 | Devices for recovering precious metals |
| CN101857921B (en) * | 2009-04-13 | 2012-05-30 | 欣伟科技股份有限公司 | Devices for recovering precious metals |
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