WO1980001563A1 - Recuperation of cyanides from rising solutions of cyanidric processes for electrodeposition of metals - Google Patents
Recuperation of cyanides from rising solutions of cyanidric processes for electrodeposition of metals Download PDFInfo
- Publication number
- WO1980001563A1 WO1980001563A1 PCT/BR1980/000002 BR8000002W WO8001563A1 WO 1980001563 A1 WO1980001563 A1 WO 1980001563A1 BR 8000002 W BR8000002 W BR 8000002W WO 8001563 A1 WO8001563 A1 WO 8001563A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cyanides
- recuperation
- rinsing
- metals
- electrodeposition
- 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.)
- Ceased
Links
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
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/44—Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/16—Regeneration of process solutions
- C25D21/20—Regeneration of process solutions of rinse-solutions
-
- 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
- the metallic cyanides precipitated by means of the proposed process that is theRECUPERATION OF CYA NIDES FROM RINSING SOLUTIONS OF CYANIDRIC PROCESSES FOR ELEC ⁇ TRODEPOSITION OF METALS, maybe directly re-used in the re ⁇ spective dips after their rinsing (the insoluble precipi ⁇ tate) in the filters or by deposition with water, until the rinsing water attains a density of 1.000 or 0° Be, thus re ⁇ leasing the precipitated cyanide fromthe other soluble ⁇ -x ⁇ p ⁇ nent
- the same process presented may also be used for the precipi
- the value of the reclaimed material is therefore 2.1 times the value of the metallic salt used for the recuperation.
- the physical values are constant in ⁇ ternationally; -the values in money may show up in relation to the cost of the chemical products per country.
- the copper, the zinc, the cadmium, the silver, the gold and cyanides are imported materials, thus justifying avoidance of the loss of these products in the rinsing solutions in the electroplating industry.
- the electroplating industry is up against problems con ⁇ cerning the compliance with the standards of public organs, which are responsible for the preservation and protection of the ecology. They demand an efficient and complete treat ment of the industrial effluent waste products.
- the precipitation formulation may be generalized consid ⁇ ering as -M- the symbol of a metal, the atomic weight of which is between 60 and 200, thus allowing the objective of the recuperation of the cyanides and the respective metals in the rinsing solutions.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Metallurgy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Water Supply & Treatment (AREA)
- Manufacturing & Machinery (AREA)
- Hydrology & Water Resources (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Electrochemistry (AREA)
- Removal Of Specific Substances (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Electrolytic Production Of Metals (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Soluble cyanides contained in rinse solutions are transformed by chemical reaction exemplified by (M(CN)2,3,4)1,2,3-+ n MC1 = n MCN into insoluble precipitates which are recovered.
Description
. RECUPERATION OF CYANIDES FROM RINSING SOLUTIONS OF CYANIDRIC PROCESSES FOR ELECTRODEPOSITION OF METALS. a) TECHNICAL FIELD This report concerns a simple process for precipitation, re¬ cuperation and re-use of cyanides from rinsing solutions, allov7ed in the"industrial methods for the electrodeposition of metals. It is in the electroplating plant of industry that more economical and practical systems and methods are sought for the purifying treatment of rinsing solutions. The work developed in this sector of electrochemistry is rather complicated and requires specialized personnel trained for the use of the equipment employed; it is expensive due to high costs of energy and specialized labour. The large a- mount of chemical products lost in the electroplating indus¬ try is common knowledge, creating, as a result of treatment for destroying poisons, high, heavy metal content slurries, which will be lost. The Recuperation of Cyanides from Rinsing Solutions of Cya- nidric Processes for Electrodeposition of Metals serves to dispense with chemical products in the treatment of the cya¬ nide bearing rinsing solutions, transforming the soluble cyanide into insoluble cyanide, thus allowing their removal through filtration or deposition. The insoluble cyanide may, therefore, be easily re-used industrially. The process referred to, by inclusion on the technical side of electro¬ chemistry, represents an innovation over the traditional processes for the treatment of residues originating in elec¬ troplating processes. b) BACKGROUND ART
Everyone in the trade knows that the treatment of cyanide bearing rinsing solutions is attained mainly through the p'oi_ son -elimination process by destruction of the cyanide. Ano'th er known process, the recycling, is based upon the evapora- tion of the solvent in the rinsing solutions, by using ener¬ gy to concentrate the fluid which will be re-used in the re¬ spective dips.
other processes are also known which use ion exchangers, involving high capital investment for equipment and the loss of chemical products through their destruction. c) DISCLOSURE OF THE INVENTION The process which is now proposed allows the total precipi¬ tation of the cyanides in the insoluble form, together wit the cyanide metals and their recuperation for industrial re-use. According to the amount of cyanide in the rinsing solutions adequate quantities of metallic salts shall be added; these will correspond to the metal associated with the cyanide i the rinsing solution and in the electroplating dip. As an example, the zinc sulphate and/or chloride for rinsing so¬ lutions of the cyanidric zinc dip, or else the copper sul- phate and/or chloride for the rinsing solution of the cya¬ nidric copper dip, associated with acid or alkaline salts which control the pH value of the rinsing solution and the valency of the metallic ions, according to the type of met- tal, thus obtaining a full transformation of all the free cyanide and cyanides associated in complex salts to a sim¬ ple metallic cyanide, insoluble in water with an adequate pH in the rinsing solutions, without releasing cyanidric gases. All the cyanide in the water is thus transformed into an insoluble salt, and may be removed from the rinsing solu¬ tion through deposition or filtration.
By using for each type of metal in the electrodeposition of metals process separate rinsing tanks without danger of in¬ termixing metals, the metallic cyanides precipitated by means of the proposed process, that is theRECUPERATION OF CYA NIDES FROM RINSING SOLUTIONS OF CYANIDRIC PROCESSES FOR ELEC¬ TRODEPOSITION OF METALS, maybe directly re-used in the re¬ spective dips after their rinsing (the insoluble precipi¬ tate) in the filters or by deposition with water, until the rinsing water attains a density of 1.000 or 0° Be, thus re¬ leasing the precipitated cyanide fromthe other soluble α-xηpσnent The same process presented may also be used for the precipi
- UK
O W1
tation and/or recuperation of cyanide from any cyanidric li uid already used in the electroplating of zinc, cadmium, co£ per, silver, gold and their alloys.
The initial experiments have already demonstrated the sim- plicity Of the RECUPERATION OF CYANIDES FROM RINSING SOLU¬ TIONS OF CYANIDRIC PROCESSES FOR ELECTRODEPOSITION OFMETALS, where there is no need for epecialized technical personnel, nor special equipment; neither does it consume chemical prod ucts for later destruction. It reclaims efficiently the val- uable chemical products from the waters, where the value of the metallic salt used for the precipitation and recupera¬ tion is two to six times lower than the reclaimed material, e) BEST MODE OF CARRYING OUT THE INVENTION To demonstrate the technical and economic value of the proc- ess for RECUPERATION OF CYANIDES FROM RINSING SOLUTIONS OF CYANIDRIC PROCESSES FOR ELECTRODEPOSITION OF METALS, it will be exemplified in two cases:
First case: Cyanidric zinc dip, with the following formulation: - 60 g/liter of zinc cyanide at Cr$ 130,00/kg = Cr$ 7,80 50 g/liter of sodium cyanide at Cr$ 100,00/kg = Cr$ 5,00 70 g/liter of caustic soda at Cr$ 18,00/kg = Cr$ ' 1,26
One liter of zinc dip Cr$ 13,06
When one liter of the zinc dip is flushed to the rinsing tank, the following materials are needed to precipitate the soluble cyanide and part of the sodium hydroxide (caustic so da) :
- 200 g of zinc sulphate at Cr$ 14,00/kg = Cr$ 2,80 The value of the recuperation and.precipitated material af- terwards is:
- 120 g of zinc cyanide at Cr$ 130,00/kg = Cr$ 15,60
16 g of zinc hydroxide at Cr$ 40,00/kg - Cr$ 0,64 Value of recuperated material Cr$ 16,24
This means that the value of the recuperated material is 5.8 time's the value of the material used for the recuperation. The water after this treatment presents no cyanides, no heav y metals and there remains only sodium sulphate and traces
( -f'MPI : ^__ o .Λ
of sodium hydroxide, which are easily neutralized.
Second case: Cyanidric copper dip, with the following formulation: Cr$
60g/liter of copper cyanide at Cr$ 180,00 pAg = 10,8 81g/liter of sodium cyanide at Cr$ 100,00 p/kg = 8,1
15g/liter of sodium hydroxide at Cr$ 18,00 p g =- 0,2 One liter of .copper dip = 19,1
Therefore, a liter of copper dip when flushed to the rinsin tank needs the following amount of materials to precipitate the soluble cyanide:
161 g of copper chloride at Cr$ 111,60 p/kg = Cr$ 17,9
The value of the recuperated and precipitated material will then be the following: 210 g of copper cyanide at Cr$ 180,00 p/kg = Cr$ 37,8 The value of the reclaimed material is therefore 2.1 times the value of the metallic salt used for the recuperation.
The water after the treatment has no cyanides and no heavy metals, and there remains only the sodium chloride, which i no problem for the water treatment. The two cases given above give a good demonstration of the technical and economic value of the RECUPERATION OF CYANIDE
FROM RINSING SOLUTIONS OF CYANIDRIC PROCESSES FOR ELECTRODE
OSITION OF METALS.
The traditional processes for the treatment of cyanide bear ring waters show the following values concerning the usage of chemical products for the destruction of the unreclaim- able cyanides:
First case: For one liter of zinc bath dip:
- 360 g of chloride = Cr$ 2,88 410 g of sodium carbonate = Cr$ 7,38
Total Cr$ 10,26
Second case: For one liter of copper dip:
- 430 g of chloride = Cr$ 3,44 490 g of sodium carbonate - Cr$ 8,82 Total Cr$ 12,26
These expenditures do not yet include the cost of filtering and separating the slurry, the capital investment for equi£ ment and the running expenses for storage of these residues in adequate locations. f) INDUSTRIAL APPLICABILITY
In these comparisons, the physical values are constant in¬ ternationally; -the values in money may show up in relation to the cost of the chemical products per country. The mone tary values must be considered for comparisons, and the approximate equivalent in Brazil of one United States Dol¬ lar is thirty cruzeiros: (1..00 = Cr$ 30,00). In most countries, the copper, the zinc, the cadmium, the silver, the gold and cyanides are imported materials, thus justifying avoidance of the loss of these products in the rinsing solutions in the electroplating industry.
The electroplating industry is up against problems con¬ cerning the compliance with the standards of public organs, which are responsible for the preservation and protection of the ecology. They demand an efficient and complete treat ment of the industrial effluent waste products.
The high toxicity of cyanides is well known and, therefore, the necessary and strict controls by public organs over the electroplating industry are well justified. The process for RECUPERATION OF CYANIDES FROM RINSING SOLU- TIONS OF CYANIDRIC PROCESSES FOR ELECTRODEPOSITION OF MET¬ ALS is thus the only one which allows the treatment of waste waters with cyanides with profit to the users through the recuperation of the material via visual control of the treatment, thus eliminating the necessity for high costing equipment, avoiding any aggression on ecology.
The RECUPERATION OF CYANIDES FROM RINSING SOLUTIONS OF CYA¬ NIDRIC PROCESSES FOR ELECTRODEPOSITION OF METALS may also be a technique which can be applied to sundry other pro¬ cesses of recuperation of cyanides, the importance of which for the chemical and electrochemical industries in all coun tries needs no discussion. The following four chemical formulae demonstrate the devel-
opment of the reactions of the insoluble copper cyanide with the potassium cyanide dissolved to form the complex salt of soluble copper cyanide, demonstrating furthermore how the complex soluble copper cyanide by the addition of copper chloride transforms itself into the insoluble cop¬ per cyanide at the rinsing solution treatment stage:
- 1) CuCN + KCN = K (Cu(CN)2)
- 2) K (Cu(CN)2) + KCN = K2 (Cu(CN)3)
- 3) K2(Cu(CN)3)
- 4) (Cu(CN)2 3 4)
nCuCN insoluble
In formula four, there would be no difficulty in exchanging the copper chloride for copper sulphate. By using the insoluble zinc cyanide with the sodium cyanide in the assembly of the zinc dips, we would obtain the solu¬ ble compex salt zinc cyanide which may be precipitated with zinc sulphate at the rinsing solution treatment stage ac¬ cording to the formulation: Zn(CN)4 2" + Zn S04 = 2Zn (CN)2 insoluble
The precipitation formulation may be generalized consid¬ ering as -M- the symbol of a metal, the atomic weight of which is between 60 and 200, thus allowing the objective of the recuperation of the cyanides and the respective metals in the rinsing solutions.
(M(CN) 2 3 4) 1'2'3 + nMCl = nMCN
M(CN)2" + MS04 = nM(CN) 4 Δ
The technical and economic importance represented by the precipitation of cyanides from rinsing solutions from cya- nidric processes for electrodeposition of metals may, thus, be seen by the addition of metallic salts along with salts and/or acids to correct the pH value of the water and asso¬ ciated with salts, gases and/or acids to correct the valen¬ cy of metallic ions, when necessary.
O \V
Claims
1. RECUPERATION OF CYANIDES FROM RINSING SOLUTIONS OF CYA¬ NIDRIC PROCESSES FOR ELECTRODEPOSITION OF METALSRepresented by a simple process to precipitate, recuperate and re-use the cyanide contained in the rinsing solutions which are lost in the conventional industrial methods of electrodeposi^ tion of metals.. The electroplating industry demands an eco¬ nomical and practical system for the rinsing solution treat ment. It is included in the technical sector of Electroche- mistry, specifically the recuperation of residual products in the rinsing solutions. It is characteristic in that, by the addition of chemical products, the soluble cyanides con¬ tained in the rinsing solutions are transformed by a chemi¬ cal reaction into insoluble cyanides f thus making possible the recuperation and re-use for industrial purposes. This re_ cuperation must occur by the conventional processes of depo¬ sition or filtration.
2. RECUPERATION OF CYANIDES FROM RINSING SOLUTIONS OF CYA¬ NIDRIC PROCESSES FOR ELECTRODEPOSITION OF METALS, according to Claim 1, characterized by the full precipitation of insol. uble cyanides in the rinsing solutions, coupled with the met als of the residual cyanides to attempt the industrial recu¬ peration so that, according to the quantity of cyanide in the rinsing solution, there must be additions of adequate quantities of metallic salts which correspond to the metal coupled with the cyanide in the rinsing solution and the electrodeposition of metal dip.
3. RECUPERATION OF CYANIDES FROM RINSING SOLUTIONS OF CYA¬ NIDRIC PROCESSES FOR ELECTRODEPOSITION OF METALS, according to Claims 1 and 2, characterized by having all the cyanide contained in the water transformed into an insoluble salt, thus making possible the easy extraction from the rinsing solution via deposition or filtration, and that the precipi. tated metallic cyanide can be directly re-used in the re- spective dips after their rinse. The insoluble precipitate will be obtained in the pure form for re-usage in the fil¬ ters or in the deposition tanks, after the rinsing water
■^URtALT
CMPI
"Y.'IPO -
has reached a density equal to 1. 000 or 0° Be ; under these conditions , the cyanide precipitate is separated from the other soluble components .
4. RECUPERATION OF CYANIDES FROM RINSING SOLUTIONS OF CYA- NIDRIC PROCESSES FOR ELECTRODEPOSITION OF METALS, accordin to Claims 1, 2 and 3, characterized by the addition of met allic salts, where the metals of the salts show an atomic weight over 60 and, if necessary, in conjunction with salts gases and/or acids, these alter, the valency of the metalli ions contained in the rinsing solutions and/or associated with salts and/or acids, to correct the water pH.
5. RECUPERATION OF CYANIDES FROM RINSING SOLUTIONS OF CYA¬ NIDRIC PROCESSES FOR ELECTRODEPOSITION OF METALS, accordin to Claims 1, 2, 3 and 4, characterized also by being used for the precipitation and recuperation of any cyanidric li quid bearing cyanides which has been used for the electrode position process of zinc, copper, cadmium, silver or gold and their alloys.
6. RECUPERATION OF CYANIDES FROM RINSING SOLUTIONS OF CYA- NIDRIC PROCESSES FOR ELECTRODEPOSITION OF METALS, accordin to Claims 1, 2, 3, 4 and 5, characterized by having a gen¬ eralized chemical formulation in which the symbol -M- rep¬ resents a metal with an atomic weight between 60 and 200, and the generic formula considered is presented thus: (M(CN)2 3 4)1,2'3~ + nMCl = nMCN
M(CN)4~ + MS04 = nM(CN)2
OA '
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT900680A AT374507B (en) | 1979-01-29 | 1980-01-18 | METHOD FOR RECOVERY OF CYANIDES |
| DE19803030676 DE3030676A1 (en) | 1979-01-29 | 1980-01-18 | RECUPERATION OF CYANIDES FROM RISING SOLUTIONS OF CYANIDRIC PROCESSES FOR ELECTRODEPOSITION OF METALS |
| DK391480A DK391480A (en) | 1979-01-29 | 1980-09-16 | RECOVERY OF CYANIDES FROM RINSE SOLUTIONS FROM CYANIDIC METHODS OF ELECTRICAL DISPOSAL |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BR7900702 | 1979-01-29 | ||
| BR7900702A BR7900702A (en) | 1979-01-29 | 1979-01-29 | CYANIDE RECOVERY FROM WASHING WATERS OF METAL ELECTRODEPOSITION CYANIDRAL PROCESSES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1980001563A1 true WO1980001563A1 (en) | 1980-08-07 |
Family
ID=4014093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/BR1980/000002 Ceased WO1980001563A1 (en) | 1979-01-29 | 1980-01-18 | Recuperation of cyanides from rising solutions of cyanidric processes for electrodeposition of metals |
Country Status (28)
| Country | Link |
|---|---|
| EP (1) | EP0022839A4 (en) |
| JP (1) | JPS56500136A (en) |
| AR (1) | AR231428A1 (en) |
| AU (1) | AU537457B2 (en) |
| BE (1) | BE881417A (en) |
| BR (1) | BR7900702A (en) |
| CA (1) | CA1160018A (en) |
| CH (1) | CH645077A5 (en) |
| CS (1) | CS221253B2 (en) |
| DD (1) | DD148795A5 (en) |
| ES (1) | ES488033A0 (en) |
| FI (1) | FI67356C (en) |
| GB (1) | GB2055900B (en) |
| GR (1) | GR67263B (en) |
| HU (1) | HU182603B (en) |
| IE (1) | IE49370B1 (en) |
| IL (1) | IL59207A (en) |
| IT (1) | IT1188898B (en) |
| MX (1) | MX153331A (en) |
| NL (1) | NL8020027A (en) |
| NO (1) | NO153217C (en) |
| PL (1) | PL128213B1 (en) |
| PT (1) | PT70738A (en) |
| RO (1) | RO80891A (en) |
| SE (1) | SE441521B (en) |
| WO (1) | WO1980001563A1 (en) |
| YU (1) | YU19780A (en) |
| ZA (1) | ZA80402B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014111254A (en) * | 2012-11-01 | 2014-06-19 | Katayama Chem Works Co Ltd | Treatment method of a cyanogen-containing effluent |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT375683B (en) * | 1982-06-15 | 1984-08-27 | Wolfram Manner | METHOD FOR THE RECOVERY OF INGREDIENTS FROM ACID OR ACIDIFIED SOURING, ACIDATING OR GALVANOLOLES |
| CA2057217C (en) * | 1990-12-11 | 1999-08-31 | Bruce Edward Holbein | A process for the decontamination of toxic, heavy-metal containing soils |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1614523A (en) * | 1922-05-13 | 1927-01-18 | American Cyanamid Co | Process of producing heavy metal cyanides |
| US2845330A (en) * | 1955-08-15 | 1958-07-29 | Holden Artemas F | Method of recovering cyanides from waste aqueous solutions containing metal cyanides |
| US3736239A (en) * | 1971-03-18 | 1973-05-29 | Us Interior | Neutralization of metal containing wastes |
| JPS50656A (en) * | 1973-05-08 | 1975-01-07 | ||
| SU528265A1 (en) * | 1972-09-26 | 1976-09-15 | Государственный научно-исследовательский и проектный институт по обогащению руд цветных металлов "Казмеханобр" | The method of purification of wastewater from copper and cyanides |
-
1979
- 1979-01-29 BR BR7900702A patent/BR7900702A/en unknown
-
1980
- 1980-01-18 CH CH734480A patent/CH645077A5/en not_active IP Right Cessation
- 1980-01-18 JP JP50039180A patent/JPS56500136A/ja active Pending
- 1980-01-18 GB GB8031140A patent/GB2055900B/en not_active Expired
- 1980-01-18 WO PCT/BR1980/000002 patent/WO1980001563A1/en not_active Ceased
- 1980-01-18 RO RO80102238A patent/RO80891A/en unknown
- 1980-01-18 NL NL8020027A patent/NL8020027A/en not_active Application Discontinuation
- 1980-01-23 IL IL59207A patent/IL59207A/en unknown
- 1980-01-23 ZA ZA00800402A patent/ZA80402B/en unknown
- 1980-01-24 CS CS80517A patent/CS221253B2/en unknown
- 1980-01-24 MX MX180937A patent/MX153331A/en unknown
- 1980-01-25 ES ES488033A patent/ES488033A0/en active Granted
- 1980-01-25 GR GR61039A patent/GR67263B/el unknown
- 1980-01-25 YU YU00197/80A patent/YU19780A/en unknown
- 1980-01-28 PT PT70738A patent/PT70738A/en unknown
- 1980-01-28 IE IE161/80A patent/IE49370B1/en unknown
- 1980-01-28 HU HU80178A patent/HU182603B/en unknown
- 1980-01-28 CA CA000344508A patent/CA1160018A/en not_active Expired
- 1980-01-28 DD DD80218685A patent/DD148795A5/en unknown
- 1980-01-29 BE BE0/199166A patent/BE881417A/en not_active IP Right Cessation
- 1980-01-29 FI FI800250A patent/FI67356C/en not_active IP Right Cessation
- 1980-01-29 AR AR279780A patent/AR231428A1/en active
- 1980-01-29 AU AU54999/80A patent/AU537457B2/en not_active Ceased
- 1980-01-29 PL PL1980221661A patent/PL128213B1/en unknown
- 1980-01-29 IT IT47738/80A patent/IT1188898B/en active
- 1980-08-15 EP EP19800900266 patent/EP0022839A4/en not_active Withdrawn
- 1980-09-23 SE SE8006649A patent/SE441521B/en not_active IP Right Cessation
- 1980-09-26 NO NO802849A patent/NO153217C/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1614523A (en) * | 1922-05-13 | 1927-01-18 | American Cyanamid Co | Process of producing heavy metal cyanides |
| US2845330A (en) * | 1955-08-15 | 1958-07-29 | Holden Artemas F | Method of recovering cyanides from waste aqueous solutions containing metal cyanides |
| US3736239A (en) * | 1971-03-18 | 1973-05-29 | Us Interior | Neutralization of metal containing wastes |
| SU528265A1 (en) * | 1972-09-26 | 1976-09-15 | Государственный научно-исследовательский и проектный институт по обогащению руд цветных металлов "Казмеханобр" | The method of purification of wastewater from copper and cyanides |
| JPS50656A (en) * | 1973-05-08 | 1975-01-07 |
Non-Patent Citations (1)
| Title |
|---|
| Sewage and Industrial Wastes, Volume 22, No. 9, issued September 1950 (Lancaster, Pennsylvania) David Milne, "Disposal of Cyanides by Complexation" see pages 1192-1199. * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014111254A (en) * | 2012-11-01 | 2014-06-19 | Katayama Chem Works Co Ltd | Treatment method of a cyanogen-containing effluent |
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