JPH02163327A - Reducing agent for recovering noble metal - Google Patents
Reducing agent for recovering noble metalInfo
- Publication number
- JPH02163327A JPH02163327A JP31633588A JP31633588A JPH02163327A JP H02163327 A JPH02163327 A JP H02163327A JP 31633588 A JP31633588 A JP 31633588A JP 31633588 A JP31633588 A JP 31633588A JP H02163327 A JPH02163327 A JP H02163327A
- Authority
- JP
- Japan
- Prior art keywords
- reducing agent
- noble metals
- metal powder
- carbonyl
- cyanide
- 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
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 25
- 229910000510 noble metal Inorganic materials 0.000 title abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 17
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims abstract description 13
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000003513 alkali Substances 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 6
- 239000011701 zinc Substances 0.000 claims abstract description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 230000001603 reducing effect Effects 0.000 claims abstract description 5
- GRWZHXKQBITJKP-UHFFFAOYSA-L dithionite(2-) Chemical compound [O-]S(=O)S([O-])=O GRWZHXKQBITJKP-UHFFFAOYSA-L 0.000 claims abstract description 4
- UORVGPXVDQYIDP-UHFFFAOYSA-N borane Chemical compound B UORVGPXVDQYIDP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910010277 boron hydride Inorganic materials 0.000 claims abstract description 3
- 239000010970 precious metal Substances 0.000 claims description 21
- 150000001728 carbonyl compounds Chemical class 0.000 claims description 14
- 239000010953 base metal Substances 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 3
- 125000004093 cyano group Chemical group *C#N 0.000 claims description 2
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- ACVYVLVWPXVTIT-UHFFFAOYSA-M phosphinate Chemical compound [O-][PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-M 0.000 abstract description 3
- 229910021529 ammonia Inorganic materials 0.000 abstract description 2
- 239000007800 oxidant agent Substances 0.000 abstract description 2
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 abstract 2
- 230000003647 oxidation Effects 0.000 abstract 2
- 238000007254 oxidation reaction Methods 0.000 abstract 2
- WSGYTJNNHPZFKR-UHFFFAOYSA-N 3-hydroxypropanenitrile Chemical compound OCCC#N WSGYTJNNHPZFKR-UHFFFAOYSA-N 0.000 abstract 1
- 230000007062 hydrolysis Effects 0.000 abstract 1
- 238000006460 hydrolysis reaction Methods 0.000 abstract 1
- 150000002500 ions Chemical class 0.000 abstract 1
- 238000000034 method Methods 0.000 description 10
- 229910052737 gold Inorganic materials 0.000 description 8
- 239000010931 gold Substances 0.000 description 8
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 6
- 239000005708 Sodium hypochlorite Substances 0.000 description 4
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- -1 0MC carbonyl compound Chemical class 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 150000001299 aldehydes Chemical class 0.000 description 2
- 150000002343 gold Chemical class 0.000 description 2
- 150000002736 metal compounds Chemical class 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Natural products CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000012279 sodium borohydride Substances 0.000 description 1
- 229910000033 sodium borohydride Inorganic materials 0.000 description 1
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 description 1
- 229910001379 sodium hypophosphite Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
この発明は貴金属含有のシアン系溶液中から貴金属を還
元して回収するための還元剤に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a reducing agent for reducing and recovering a noble metal from a cyanide solution containing a noble metal.
〈従来の技術〉
貴金属を含むシアン系の溶液、例えば貴金属メツキ廃液
或いは貴金属メツキ層剥離後の剥離液等から貴金属を回
収する方法としては、以下のような２つの方法が知られ
ている。<Prior Art> The following two methods are known for recovering precious metals from a cyanide-based solution containing precious metals, such as precious metal plating waste liquid or stripping liquid after peeling off a noble metal plating layer.
第１の方法としては、アルミニウムや亜鉛の金属粉を「
還元剤」として溶液中に添加し、貴金属を還元・沈澱さ
せて回収する方法がある。The first method is to use aluminum or zinc metal powder.
There is a method in which precious metals are added to the solution as a "reducing agent" to reduce and precipitate the precious metals and recover them.
第２の方法としては、溶液中のシアンを次亜塩素酸ソー
ダによりいったん分解した後、水素化硼素ナトリウム、
亜二チオン酸ナトリウム、ヒドラジンなどを「還元剤」
として溶液中に添加し、貴金属を還元・沈澱させて回収
する方法がある（米国特許明細書筒４，０９２，１５４
号参照）。The second method is to decompose cyanide in the solution with sodium hypochlorite, and then use sodium borohydride.
"Reducing agents" such as sodium dithionite and hydrazine
There is a method in which precious metals are added to a solution and recovered by reducing and precipitating them (U.S. Pat. No. 4,092,154).
(see issue).
〈発明が解決しようとする課題〉
しかしながらこのような従来の技術は、貴金属の回収効
率及び回収作業性の点で必ずしも満足のいくものでなか
った。<Problems to be Solved by the Invention> However, such conventional techniques are not necessarily satisfactory in terms of recovery efficiency and recovery workability of precious metals.
すなわち、第１の方法にあっては、溶液中にＣＮ−イオ
ンなどが分解されずに残っているため、いったん還元さ
れて沈降した貴金属が再度溶解しはじめる。従って、還
元後すぐにｐ過処理して分離回収する必要があるため回
収作業性の面で不利であった。尚、いったん還元された
貴金属の再溶解現象は、空気中から溶は込んだ酸素の酸
化作用でも促進されるので、再溶解の完全防止は難しい
。That is, in the first method, since CN- ions and the like remain undecomposed in the solution, the noble metal that has been reduced and precipitated begins to dissolve again. Therefore, immediately after reduction, it is necessary to carry out a p overtreatment and separate and recover, which is disadvantageous in terms of recovery workability. It should be noted that the redissolution phenomenon of the noble metal once reduced is promoted by the oxidizing effect of oxygen introduced into the noble metal from the air, so it is difficult to completely prevent redissolution.
また、第２の方法にあっては、シアンを分解する手間が
かかると共に、多量の次亜塩素酸ソーダを添加するので
貴金属回収後に残される廃液が増加し、それの後処理が
面倒となる。また、次亜塩素酸ソーダ自体には酸化作用
があるので、この次亜塩素酸ソーダに打ち消されないだ
けの還元剤を投入する必要があり、どうしても還元剤の
消費量が増大する傾向にあった。Furthermore, in the second method, it takes time and effort to decompose cyanide, and since a large amount of sodium hypochlorite is added, the amount of waste liquid remaining after precious metal recovery increases, and its post-treatment becomes troublesome. In addition, since sodium hypochlorite itself has an oxidizing effect, it is necessary to add enough reducing agent to prevent it from being canceled out by the sodium hypochlorite, which inevitably tends to increase the amount of reducing agent consumed. .
そこで、理想的な貴金属回収としては、上記の如き課題
を解決することができるものであるといえる。すなわち
、その課題とは、
■ シアンを分解するための特別な添加剤や工程を必要
としない。Therefore, it can be said that the ideal precious metal recovery is one that can solve the above problems. In other words, the challenges are: ■ No special additives or processes are required to decompose cyanide.
■ いったん還元した貴金属を再溶解させない。■ Do not re-melt precious metals once reduced.
■ 貴金属を高い効率で還元できる。■ Precious metals can be reduced with high efficiency.
この発明に係る還元剤は、このような要件■〜■を全で
満足できる理想的な貴金属回収を実現するだめに開発さ
れたものである。The reducing agent according to the present invention was developed to realize ideal precious metal recovery that satisfies all of these requirements (1) to (3).
〈課題を解決するための手段〉
この発明の発明者は前記目的を達成すべく鋭意研究を重
ねた結果、既知の還元剤にカルボニル化合物を組合わせ
ることにより前記■〜■の要件を満足できることを知見
したものである。すなわち、この発明に係る貴金属回収
用の還元剤は、アルミニウム金属粉、亜鉛金属粉、水素
化硼素アルカリ、亜二千オン酸アルカリ、ヒドラジン、
次亜リン酸アルカリの少なくとも一種と、カルボニル化
合物とからなるものである。<Means for Solving the Problems> As a result of intensive research to achieve the above object, the inventor of the present invention has discovered that the requirements ① to ② above can be satisfied by combining a carbonyl compound with a known reducing agent. This is what I found out. That is, the reducing agent for recovering precious metals according to the present invention includes aluminum metal powder, zinc metal powder, alkali borohydride, alkali dithionite, hydrazine,
It consists of at least one type of alkali hypophosphite and a carbonyl compound.
カルボニル化合物中のカルボニル基は、ＣＮ−イオンと
反応してシアンヒドリンを形成し、これが加水分解によ
りアンモニアとオキシ酸に分解されるので、結果的にシ
アンが分解されることとなる。また、カルボニル化合物
のうちアルデヒドはそれ自体が還元作用をもっているた
め、酸化防止効果もある。従って、アルデヒドは溶液中
のシアンを分解するだけでなく、酸化剤や空気中から溶
込んだ酸素などの酸化作用も抑制するので、貴金属の再
溶解を確実に防止する。また、シアンを分解するための
特別な添加剤や工程を必要としないし、高い効率で貴金
属を還元できる。The carbonyl group in the carbonyl compound reacts with the CN- ion to form cyanohydrin, which is hydrolyzed into ammonia and oxyacid, resulting in the decomposition of cyanide. Furthermore, among carbonyl compounds, aldehydes themselves have a reducing effect, and therefore have an antioxidant effect. Therefore, aldehyde not only decomposes cyanide in the solution, but also suppresses the oxidizing effects of oxidizing agents and oxygen dissolved in the air, thereby reliably preventing re-dissolution of the precious metal. Additionally, no special additives or processes are required to decompose cyanide, and precious metals can be reduced with high efficiency.
この発明にカルボニル化合物としては、ホルムアルデヒ
ド、アセトアルデヒド、アセトンなどが好適である。こ
のカルボニル化合物に属する薬品は比較的安価であり、
コストの低減も図れる。Suitable carbonyl compounds for this invention include formaldehyde, acetaldehyde, and acetone. Drugs belonging to this carbonyl compound are relatively inexpensive;
Cost reduction can also be achieved.
また、このカルボニル化合物の添加量としては、０、０
５ Ｍ〜５Ｍが好適である。In addition, the amount of this carbonyl compound added is 0,0
5M to 5M is suitable.
一方、アルミニウム金属粉、亜鉛金属粉、水素化硼素ア
ルカリ、亜二千オン酸アルカリ、ヒドラジン、次亜リン
酸アルカリの少なくとも一種の添加量としては、０．０
１〜ＬＭが好適である。On the other hand, the addition amount of at least one of aluminum metal powder, zinc metal powder, alkali boron hydride, alkali dithionite, hydrazine, and alkali hypophosphite is 0.0
1 to LM is suitable.
そして、発明者は更に研究を進めていった結果、前記カ
ルボニル化合物を含んだ還元剤に、シアノ１ｊ（体を形
成する卑金属の金属粉、又は該卑金属の化合物を組み合
わせることにより、貴金属の再溶解を更に確実に防止で
きることを知見した。ここで、卑金属とは、銅、鉄、コ
バルト、ニッケルなどである。そして、その化合物とは
上記金属の酸化物、水酸化物、炭酸塩、硫酸塩などであ
る。As a result of further research, the inventor found that by combining the reducing agent containing the carbonyl compound with cyano 1j (base metal powder forming the base metal or a compound of the base metal), the noble metal could be redissolved. We have found that base metals include copper, iron, cobalt, nickel, etc., and their compounds include oxides, hydroxides, carbonates, sulfates, etc. of the above metals. It is.
これら、卑金属の金属粉、又は該卑金属の化合物の添加
量としては、０．０１〜１．０ Ｍが好適である。The amount of these base metal powders or base metal compounds added is preferably 0.01 to 1.0 M.
〈実 施 例〉 以下この発明の好適な実施例を説明する。<Example> Preferred embodiments of the present invention will be described below.
この実施例では、金メツキ被膜を溶解したシアン系の金
剥離液から、本願発明に係る還元剤により金を還元・回
収する実験を行った。この金剥離液中の総シアン量は、
ＫＣＮとして５０ｇ／ｌであった。また金の量は４．３
ｇ／ｌで、ｐＨはＫＯＨにより１３に１周整しである。In this example, an experiment was conducted in which gold was reduced and recovered from a cyan-based gold stripping solution in which a gold plating film was dissolved using a reducing agent according to the present invention. The total amount of cyanide in this gold stripping solution is
It was 50 g/l as KCN. Also, the amount of gold is 4.3
g/l, the pH is adjusted once to 13 by KOH.
そして、この金剥離液に以下のような組成の本願発明に
係る還元剤を添加し、１日後及び５日後の金の残留量を
高周波プラズマ分析装置（島津製作所製Ｉ ＣＰＳ−５
０）により測定した。Then, a reducing agent according to the present invention having the following composition was added to this gold stripping solution, and the residual amount of gold was measured after 1 day and 5 days using a high frequency plasma analyzer (I CPS-5 manufactured by Shimadzu Corporation).
0).
１廉斑上
還元剤の組成：
・アルミニウム金属粉−・−−０，２Ｍ・ホルムアルデ
ヒド・・−・−−１，０ＭＣカルボニル化合物）
・ヒドラジン
残留全濃度：
・１日後−・−・・・−・
１５日後
０．１Ｍ
２、５ ｍｇ／ １
１、６ ｍｇ／ ト
アセトアルデヒド・−−−−−−−１，０Ｍ（カルボニ
ル化合物）
残留全濃度：
・１日後−・−・−・−・−ｍ−・・−・・−２，２ｍ
ｇ／ ｌ−５日後−一−−−−・・−・−一−−−−−
−−−−・−０，９ｍｇ／ １実４Ｉ鉗斐
還元剤の組成：
・アルミニウム金属粉・−−−−−０，２Ｍ・アセトア
ルデヒド−・−・−・−１，ＯＭ（カルボニル化合物）
・銅金属粉・−一−−−−−−−−・−・・−・−−−
−−−０，１Ｍ（卑金属）
残留全濃度：
・１日後−−−−ｍ−・−−−−−−−−一・−・−０
，３ｍｇ／ ｉ！・５日後−一−−−・〜・−一−−−
−−−−・−０，３ｍｇ／ ｊ２実逼ｌ汁土
還元剤の組成：
・亜鉛金属粉・・・
・ホルムアルデヒド
（カルボニル化合物）
・銅金属粉−−−一−−・−・・・・・（卑金属）
残留全濃度：
・１日後・−・・・・・・−・−・−一一一−−−・−
５，２ｍｇ／ｆｆ・５日後−−−−−−−−一−−−−
−−・・・・・・・・ １．６ｍｇ／１０．３Ｍ
１、０ Ｍ
０．１Ｍ
実五〇九ｌ
還元剤の組成：
・アルミニウム金属粉・
０．３Ｍ
文法ｌ九１
還元剤の組成：
・水素化硼素ナトリウム−０，１Ｍ
・ホルムアルデヒド−・−−−−−−−−１，０Ｍ（カ
ルボニル化合物）
・銅金属粉−−−−−−・−・−・−・（卑金属）
０．２Ｍ
残留全濃度：
・１日後−・−・・−−一−−−−−−・・５日後・−
一一一・・・
８、３ ｍｇ／ ｉ！
’３．６ｍｇ／ｌ
亥１１達ｉ
還元剤の組成：
・アルミニウム金属粉−・・−・−
・亜二チオン酸ナトリウム
・次亜リン酸ナトリウム・
・ホルムアルデヒド・−一一−−−−−・・−・（カル
ボニル化合物）
・ンａ 石ｆｉ！ニッケル−・−・・−一−−−・−・
（卑金属の化合物）
０．１Ｍ
０１２Ｍ
ＯｌＩＭ
Ｏ，５Ｍ
０、１ Ｍ
・１日後−・・・−ｍ−−−・−・・・・−・−・・−
・・ １．２ ｍｇ／ １・５日後−・−・・・・−・
・・−・−−−−−−−・ ４．５ ｍｇ ／ ４２こ
の実施例６の場合は１日後には残留全濃度がいったん１
．２ ｔａｇ／ ｊ！まで低下し、その後再溶解により
５日後には４．５ ｔａｇ／ ｉまで増えた。この場合
の再溶解は従来技術の如（還元後すぐに起こるのではな
く、少なくとも数日たって起こるので、従来のように還
元直後の早象、なる分離・回収を強いられることがなく
操作上特に問題ない。1. Composition of the reducing agent: - Aluminum metal powder --- 0,2M formaldehyde --- 1,0MC carbonyl compound) - Total residual concentration of hydrazine: - One day later --- - After 15 days 0.1M 2,5 mg/ 1 1,6 mg/ Toacetaldehyde ------- 1,0M (carbonyl compound) Total residual concentration: - After 1 day - - - - - - - m-・・・・・−2,2m
g/l-5 days later-1-----・・---1----
-----・-0,9mg/ 1 fruit 4I Composition of the reducing agent: - Aluminum metal powder - -----0,2M - Acetaldehyde - - - - -1,OM (carbonyl compound) - Copper metal powder・−1−−−−−−−−・−・・−・−−−
---0,1M (base metal) Total residual concentration: ・After 1 day---m-・----1・-・-0
,3mg/i!・5 days later -1---・～・-1---
----・-0.3 mg/ j2fruit composition of soil reducing agent: - Zinc metal powder... - Formaldehyde (carbonyl compound) - Copper metal powder --------...・(base metal) Total residual concentration: ・After 1 day・−・・・・−・−・−111−−−・−
5.2 mg/ff・5 days later--------
--・・・・・・・・・ 1.6mg/10.3M 1,0M 0.1M Real 509l Composition of reducing agent: - Aluminum metal powder - 0.3M Grammar 191 Composition of reducing agent : - Sodium boron hydride - 0,1M - Formaldehyde - -------1,0M (carbonyl compound) - Copper metal powder - -------, -, -, (base metal) 0 .2M Total residual concentration: - 1 day later - - - - - - - - - - - 5 days later -
111... 8.3 mg/i! '3.6mg/l 亥11边 Reducing agent composition: - Aluminum metal powder - - - - - Sodium dithionite - Sodium hypophosphite - Formaldehyde -11 - - - -・-・(carbonyl compound) ・n a stone fi! Nickel－・－・・－１－－－・－・
(Base metal compound) 0.1M 012M OlIM O,5M 0,1 M ・1 day later---m---
... 1.2 mg/ 1.5 days later ---
·····················································································4.5 mg
．． 2 tag/j! It decreased to 4.5 tag/i after 5 days due to redissolution. In this case, redissolution does not occur immediately after reduction, as in the prior art, but occurs at least several days after reduction, so there is no need for early separation and recovery immediately after reduction, which is particularly important for operation. no problem.
〈発明の効果〉
この発明に係る貴金属回収用の還元剤は以上説明してき
た如き内容のものなので、■シアンを分解するための特
別な添加剤や工程を必要とせず、■いったん還元した貴
金属を再溶解させず、■貴金属を高い効率で還元できる
一一−−−−−という効果を奏することができる。しか
も、比較的安価な薬品により得られるのでコスト的にも
有利である。<Effects of the Invention> Since the reducing agent for recovering precious metals according to the present invention has the content as explained above, ■ it does not require special additives or processes to decompose cyanide, and ■ it can reduce precious metals once reduced. It is possible to achieve the following effects: 1. Noble metals can be reduced with high efficiency without re-melting. Moreover, since it can be obtained using relatively inexpensive chemicals, it is advantageous in terms of cost.
残留金濃度：Residual gold concentration:
Claims (2)
て回収するための還元剤であって、 アルミニウム金属粉、亜鉛金属粉、水素化硼素アルカリ
、亜二チオン酸アルカリ、ヒドラジン、次亜リン酸アル
カリの少なくとも一種と、カルボニル化合物とからなる
貴金属回収用の還元剤。(1) A reducing agent for reducing and recovering precious metals from cyanide-based solutions containing precious metals, including aluminum metal powder, zinc metal powder, alkali boron hydride, alkali dithionite, hydrazine, and hypophosphorous. A reducing agent for precious metal recovery comprising at least one acid-alkali and a carbonyl compound.
卑金属の金属粉、又は該卑金属の化合物を組み合わせて
成る貴金属回収用の還元剤。(2) A reducing agent for recovering precious metals, which is formed by combining the reducing agent according to claim 1 with a metal powder of a base metal that forms a cyano complex, or a compound of the base metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31633588A JPH02163327A (en) | 1988-12-16 | 1988-12-16 | Reducing agent for recovering noble metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31633588A JPH02163327A (en) | 1988-12-16 | 1988-12-16 | Reducing agent for recovering noble metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02163327A true JPH02163327A (en) | 1990-06-22 |
Family
ID=18075979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31633588A Pending JPH02163327A (en) | 1988-12-16 | 1988-12-16 | Reducing agent for recovering noble metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02163327A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003039791A1 (en) * | 2001-11-02 | 2003-05-15 | The Trustees Of Princeton University | Methods for the preparation of metallic alloy nanoparticles and compositions thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4855169A (en) * | 1971-11-08 | 1973-08-02 | ||
| JPS52145325A (en) * | 1976-05-31 | 1977-12-03 | Nissan Motor Co Ltd | Reduction recovery of noble metal |
| JPS55134137A (en) * | 1979-04-05 | 1980-10-18 | Ube Ind Ltd | Palladium recovering method |
| JPS60187634A (en) * | 1984-03-06 | 1985-09-25 | Hitachi Plant Eng & Constr Co Ltd | Method for removing copper from waste liquor after chemical copper plating |
| JPS6134125A (en) * | 1984-07-26 | 1986-02-18 | Mitsubishi Chem Ind Ltd | Method for recovering silver |
| JPS6137933A (en) * | 1984-07-30 | 1986-02-22 | Mitsubishi Chem Ind Ltd | Method for recovering silver |
-
1988
- 1988-12-16 JP JP31633588A patent/JPH02163327A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4855169A (en) * | 1971-11-08 | 1973-08-02 | ||
| JPS52145325A (en) * | 1976-05-31 | 1977-12-03 | Nissan Motor Co Ltd | Reduction recovery of noble metal |
| JPS55134137A (en) * | 1979-04-05 | 1980-10-18 | Ube Ind Ltd | Palladium recovering method |
| JPS60187634A (en) * | 1984-03-06 | 1985-09-25 | Hitachi Plant Eng & Constr Co Ltd | Method for removing copper from waste liquor after chemical copper plating |
| JPS6134125A (en) * | 1984-07-26 | 1986-02-18 | Mitsubishi Chem Ind Ltd | Method for recovering silver |
| JPS6137933A (en) * | 1984-07-30 | 1986-02-22 | Mitsubishi Chem Ind Ltd | Method for recovering silver |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003039791A1 (en) * | 2001-11-02 | 2003-05-15 | The Trustees Of Princeton University | Methods for the preparation of metallic alloy nanoparticles and compositions thereof |
| US6932851B2 (en) | 2001-11-02 | 2005-08-23 | The Trustees Of Princeton University | Methods for the preparation of metallic alloy nanoparticles and compositions thereof |
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