JP2585291B2 - Acid dissolution method for precious metal containing alloys - Google Patents
Acid dissolution method for precious metal containing alloysInfo
- Publication number
- JP2585291B2 JP2585291B2 JP22723687A JP22723687A JP2585291B2 JP 2585291 B2 JP2585291 B2 JP 2585291B2 JP 22723687 A JP22723687 A JP 22723687A JP 22723687 A JP22723687 A JP 22723687A JP 2585291 B2 JP2585291 B2 JP 2585291B2
- Authority
- JP
- Japan
- Prior art keywords
- acid
- noble metal
- containing alloy
- dissolving
- acid dissolution
- 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
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
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、貴金属含有合金から貴金属を回収する際に
用いる貴金属含有合金の酸溶解法に関する。Description: TECHNICAL FIELD The present invention relates to an acid dissolving method for a noble metal-containing alloy used for recovering a noble metal from a noble metal-containing alloy.
（従来の技術とその問題点） 従来、貴金属含有合金から貴金属を回収する方法とし
ては、貴金属含有合金を硝酸で溶解することが行われて
いる。(Prior art and its problems) Conventionally, as a method of recovering a noble metal from a noble metal-containing alloy, dissolving the noble metal-containing alloy with nitric acid has been performed.
ところで硝酸で貴金属を溶解すると、必ず多量のNOx
が発生するので、NOx発生量を廃ガス処理設備の能力以
下にする為、溶解作業量（生産量）を抑えなければなら
ないという問題点があった。By the way, when precious metals are dissolved with nitric acid, a large amount of NOx
Therefore, there is a problem that the amount of dissolving work (production amount) must be suppressed in order to reduce the amount of generated NOx to the capacity of the waste gas treatment facility or less.
（発明の目的） 本発明は上記問題点を解決すべくなされたもので、貴
金属含有合金中の卑金属を酸化して金属酸化物にするこ
とにより、貴金属含有合金の酸溶解を十分に効率良く行
うことができ、かつ硝酸溶解の場合のNOxの発生を減少
或いは解消できる貴金属含有合金の酸溶解法を提供する
ことを目的とするものである。(Object of the Invention) The present invention has been made in order to solve the above problems, and oxidizes a base metal in a noble metal-containing alloy into a metal oxide, thereby sufficiently efficiently dissolving the noble metal-containing alloy in acid. It is an object of the present invention to provide a method for dissolving a noble metal-containing alloy in an acid, which can reduce or eliminate the generation of NOx in the case of dissolving nitric acid.
（問題点を解決するための手段） 上記問題点を解決するための本発明の貴金属含有合金
の酸溶解法は、貴金属含有合金を、箔又は粉粒状に加工
し、次に酸化性雰囲気中で加熱して酸化処理し、然る後
酸溶解することを特徴とするものである。(Means for Solving the Problems) The acid dissolving method of the noble metal-containing alloy of the present invention for solving the above problems is to process the noble metal-containing alloy into a foil or powder and then in an oxidizing atmosphere. It is characterized by being oxidized by heating and then dissolved by acid.
（作用） 上述の如く本発明の貴金属含有合金の酸溶解法では、
酸溶解する前に貴金属含有合金を酸化処理してその合金
中の卑金属のみを選択的に酸化するので、貴金属含有合
金の体積が酸化物によって増え、多孔質体となり、しか
も、Cu、Ni、Zn貴金属含有合金の体積が酸化物によって
増え、多孔質体となり、しかも、Cu、Ni、Zn等の酸化物
が適当な酸によくとけるためである。たとえば、Cu物は
HCl、H2SO4、HNO3等によくとける。Ni酸化物はHClによ
くとける。したがってAu−Cu−Ni合金の場合は、HClな
どがよいこととなる。特に硝酸溶解又は王水溶解した場
合、NOxの発生を抑えることができる。また酸化処理を
行う際、加熱すると酸化処理時間を短くでき、さらに加
圧することにより効果的である。しかも貴金属含有合金
を箔状又は粉粒状にするので、該合金中の酸素の拡散行
程を短くでき、合金中の卑金属の酸化を速めることがで
きる。(Action) As described above, in the method for dissolving a noble metal-containing alloy according to the present invention,
Before the acid dissolution, the noble metal-containing alloy is oxidized and only the base metal in the alloy is selectively oxidized, so that the volume of the noble metal-containing alloy increases due to the oxide and becomes porous, and furthermore, Cu, Ni, Zn This is because the volume of the noble metal-containing alloy increases due to the oxide and becomes a porous body, and moreover, oxides such as Cu, Ni, and Zn dissolve well in an appropriate acid. For example, Cu
Dissolves well in HCl, H 2 SO 4 , HNO 3 etc. Ni oxide is soluble in HCl. Therefore, in the case of an Au-Cu-Ni alloy, HCl or the like is preferable. In particular, when dissolving in nitric acid or in aqua regia, generation of NOx can be suppressed. Further, when performing the oxidation treatment, heating can shorten the oxidation treatment time, and it is effective to further apply pressure. In addition, since the noble metal-containing alloy is formed into a foil or powder, the diffusion process of oxygen in the alloy can be shortened, and the oxidation of the base metal in the alloy can be accelerated.
（実施例） 本発明による貴金属含有合金の酸溶解法の一実施例に
ついて説明する。Au0.25wt％、Ag25wt％、Cu74wt％、残
部Zn、Cd、Ni等より成る合金を、厚さ50μｍ、幅3mmの
箔に加工した。次に箔を電気炉で800℃、7.5時間、大気
中で加熱して酸化処理した。然る後この酸化した材料と
比較例として酸化処理していない材料とを同時に３時間
塩酸中に浸漬して酸溶解処理した。(Example) An example of the acid dissolving method for a noble metal-containing alloy according to the present invention will be described. An alloy composed of 0.25 wt% of Au, 25 wt% of Ag, 74 wt% of Cu and the balance of Zn, Cd, Ni, etc. was processed into a foil having a thickness of 50 μm and a width of 3 mm. Next, the foil was heated and oxidized in an electric furnace at 800 ° C. for 7.5 hours in the air. Thereafter, the oxidized material and the unoxidized material as a comparative example were simultaneously immersed in hydrochloric acid for 3 hours to perform an acid dissolution treatment.
その結果、酸化処理していない材料は、重量変化は殆
んど無く、外観の変化も見られなかったが、酸化処理し
た材料は、重量が11.53g（酸化前10g）から2.30gと変化
し、分析値もAu0.7wt％、Ag74wt％、Cu5wt％となった。As a result, the non-oxidized material showed almost no change in weight and no change in appearance, but the oxidized material changed its weight from 11.53 g (10 g before oxidation) to 2.30 g. The analysis values were Au 0.7 wt%, Ag 74 wt%, and Cu 5 wt%.
上記実施例は、塩酸による酸溶解処理の場合である
が、硝酸による酸溶解処理の場合は、卑金属が酸化した
分だけ、NOxの発生が抑えられる。In the above embodiment, the acid dissolving treatment with hydrochloric acid is performed. However, in the case of the acid dissolving treatment with nitric acid, generation of NOx is suppressed by the amount of oxidation of the base metal.
尚、貴金属含有合金中に、Snが含まれている場合、そ
のまま硝酸で溶解すると、難濾過性のSn化合物が生じ、
硝酸溶解後の濾過工程で目詰まりを起こし、濾過工程が
ネックとなってしまうが、本発明のように予め酸化処理
し、その後硝酸溶解した場合は、難濾過性のSn化合物の
生成が抑えられ、濾過がスムーズになるという別の効果
もある。In addition, when Sn is contained in the noble metal-containing alloy, if it is dissolved with nitric acid as it is, a hardly filterable Sn compound is generated,
In the filtration step after dissolving nitric acid, clogging occurs, and the filtration step becomes a bottleneck.However, when oxidation treatment is performed in advance as in the present invention and then dissolving in nitric acid, generation of a hardly filterable Sn compound is suppressed. Another effect is that the filtration becomes smooth.
また酸溶解は、上記説明の塩酸、硝酸に限らず王水に
よる酸溶解でも良いもので、この場合も酸溶解が十分に
行われるようにかつ濾過をスムーズにさせるため予め貴
金属含有合金を酸化処理するものである。The acid dissolution is not limited to hydrochloric acid and nitric acid as described above, but may be acid dissolution using aqua regia.In this case, too, the precious metal-containing alloy is oxidized in advance so that the acid dissolution is sufficiently performed and the filtration is smooth. Is what you do.
（発明の効果） 以上の説明で判るように本発明による貴金属含有合金
の酸溶解法によれば、貴金属含有合金の酸溶解が十分に
効率良く行われ、濾過作業もスムーズに行われ、しかも
NOxの発生の減少或いは解消できて、溶解作業量（生産
量）を抑える必要が無く、貴金属回収能率を向上するこ
とができるという効果を奏する。(Effect of the Invention) As can be understood from the above description, according to the method for dissolving a noble metal-containing alloy according to the present invention, the acid dissolution of the noble metal-containing alloy is sufficiently efficiently performed, and the filtering operation is smoothly performed.
It is possible to reduce or eliminate the generation of NOx, so that there is no need to suppress the dissolving work amount (production amount), and it is possible to improve the precious metal recovery efficiency.
Claims (1)
金属含有合金を、箔又は粉粒状に加工し、次に酸化性雰
囲気中で加熱して酸化処理し、然る後酸溶解することを
特徴とする貴金属含有合金の酸溶解法。(1) In dissolving a noble metal-containing alloy in an acid, the noble metal-containing alloy is processed into a foil or powder, and then heated and oxidized in an oxidizing atmosphere, and then acid-dissolved. An acid dissolving method for a noble metal-containing alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22723687A JP2585291B2 (en) | 1987-09-10 | 1987-09-10 | Acid dissolution method for precious metal containing alloys |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22723687A JP2585291B2 (en) | 1987-09-10 | 1987-09-10 | Acid dissolution method for precious metal containing alloys |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6470135A JPS6470135A (en) | 1989-03-15 |
| JP2585291B2 true JP2585291B2 (en) | 1997-02-26 |
Family
ID=16857645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22723687A Expired - Lifetime JP2585291B2 (en) | 1987-09-10 | 1987-09-10 | Acid dissolution method for precious metal containing alloys |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2585291B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5237603A (en) * | 1989-12-11 | 1993-08-17 | Sony Corporation | Cordless telephone which intermittently monitors predetermined channels from all available channels |
| US5044010A (en) * | 1990-03-29 | 1991-08-27 | At&T Bell Laboratories | Arrangement and method for selecting an available communication channel for a cordless telephone |
| US5313653A (en) * | 1992-01-30 | 1994-05-17 | Motorola, Inc. | Method for a communication unit to maintain a data base of system services |
| CA2154608A1 (en) * | 1995-07-25 | 1997-01-26 | Mourad Michael Hanna | Method of purifying gold |
| US6805972B2 (en) * | 2002-08-27 | 2004-10-19 | Johns Hopkins University | Method of forming nanoporous membranes |
| WO2010102391A1 (en) * | 2009-03-13 | 2010-09-16 | Recapture Metals Limited | Rhenium recovery |
-
1987
- 1987-09-10 JP JP22723687A patent/JP2585291B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6470135A (en) | 1989-03-15 |
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