Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
  • C01G7/00—Compounds of gold
  • C01G7/003—Preparation involving a liquid-liquid extraction, an adsorption or an ion-exchange
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
  • C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
  • C08G12/04—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
  • C08G12/06—Amines
  • C08G12/08—Amines aromatic
• • 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
  • C22B3/42—Treatment or purification of solutions, e.g. obtained by leaching by ion-exchange extraction
• • 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

• This invention relates to a poly-Schififs base which l d t t ti f up t 12 hours. can be used as speclfic complex form Of 1011 exchanger Any metal residues still adhering to the complex-former for gold. after such a treatment can be removed by treatment with It is known Bayef f Aflgewandte Chemie sodium or potassium cyanide. The material may then be 76 76 (1964)] that it is possible, by polycondensing 2,5- d again to ab orb gold,
• the charged N N complex-forming poly-Schiffs base is heated to a temperature above about 250 and up to 600 C.
• the organic CHCH n material is destroyed in this heating process and the gold This material is able to form complexes with metal is recovered in metallic form.
• the poly-Schiflfs base ions particularly those of the first and second subsidiary has a very high capacity of absorbing gold, the amounts groups of the periodic system, and to release them again. of this polymer used are rather small. Therefore, destroy- It has now been found that improved polycondensates ing these absorbing agents may be more economical then can be obtained by polycondensing l,4-diamino-2,5-dias expensive recovering process.
• the polycondensate is insoluble in the conventional peratures in the range from 40 to 90 C.
• the following organic solvents for example, alcohols, ethers, dimethyl general formula may be attributed to these polyconr formamide, acetone, chloroform, benzene and hydrocardensates. bons, and also in water. It is resistant to weak acids and weak alkaline liquors.
• n is a number greater than Y10 and may 2,5-dimercaptobenzene dihydrochloride were dissolved be as high as 2,000, preferably in the range of about 20 with continuous stirring in 70 ml. of distilled water to about 200. through which nitrogen was bubbled.
• the glyoxal is preferfree diamine, 14 ml. of a 12% by weight soda solution ably used in an amount equivalent to that of the 1,4- were added dropwise to the solution in a stream of diamino-Z,S-dimercaptobenzene or in an excess of up to nitrogen S0 that the P 0f e l e s o t 10 times the stoichiometrically necessary quantity. 7. Following complete neutralisation, the brownish-green The polycondensate according to the invention isa comsolution was heated to 60 C. in a paratfin bath, after plex-forrner which is practically specific for gold (III) which 8.8 g.
• the poly-SchifiYs base was stirred for 20 hours at room temperature in 0.1 N hydrochloric acid.
• the product was then suctionfiltered and successively washed three times with ml. of distilled water, 10 ml. of methanol and 10 ml. of ether and then dried over diphosphorus pentoxide at C./ 14 mm. Hg until its weight was constant.
• EXAMPLE 2 1 m1. of a 0.01 molar solution of zinc sulphate, 1 m1. of cadmium acetate, 1 ml. of mercury (II) acetate, 1 ml. of copper acetate and 1 ml. of tetrachloro-gold (III)- acid, were mixed together and made up to 1 litre with distilled water. 1 g. of poly-Schilts base, obtained as in Example 1, was added to this solution which was then shaken for 12 hours at room temperature. The macromolecule was then filtered off, after which the metal contents both of the filtrate and of the macromolecule are determined.
• the gold quantitatively combined with the macromolecule
• the copper (II)-, cadmium and zinc ions remained quantitatively in the solution. Only about one tenth of the mercury originally introduced also combined.
• the macromolecule was found to have combined with 1.92 mg. of gold (98%), 0.22 mg. of mercury (11%) and less than 0.002 mg. each of copper, cadmium and zinc.
• the product was shaken for 3 hours with 100 ml. of a 0.01 N sodium cyanide solution.
• Poly-Schilfs base consisting essentially of recurring units of the formula II N l-SH 118- I HS Ifil N SH Villa...

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Environmental & Geological Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Geology (AREA)
• Inorganic Chemistry (AREA)
• Manufacturing & Machinery (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Manufacture And Refinement Of Metals (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=6982364

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (2)

Citations (2)

• 1965
  • 1965-10-28 DE DE19651570310 patent/DE1570310A1/de active Pending
• 1966
  • 1966-08-26 US US575239A patent/US3481904A/en not_active Expired - Lifetime
  • 1966-10-04 GB GB44247/66A patent/GB1089148A/en not_active Expired
  • 1966-10-21 NL NL6614960A patent/NL6614960A/xx unknown

Patent Citations (2)

Also Published As

Similar Documents