US2165667A - Process of converting copper - Google Patents

Process of converting copper Download PDF

Info

Publication number
US2165667A
US2165667A US11899437A US2165667A US 2165667 A US2165667 A US 2165667A US 11899437 A US11899437 A US 11899437A US 2165667 A US2165667 A US 2165667A
Authority
US
United States
Prior art keywords
copper
sulphide
acid
solution
hydroxide
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
Application number
Other languages
English (en)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to US11899437 priority Critical patent/US2165667A/en
Priority to DEN41496D priority patent/DE708009C/de
Priority to GB36237/37A priority patent/GB508495A/en
Priority to FR831545D priority patent/FR831545A/fr
Priority to NL85790A priority patent/NL50726C/xx
Priority to BE425564D priority patent/BE425564A/xx
Application granted granted Critical
Publication of US2165667A publication Critical patent/US2165667A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D01F2/02—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from solutions of cellulose in acids, bases or salts
    • D01F2/04—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from solutions of cellulose in acids, bases or salts from cuprammonium solutions
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G3/00—Compounds of copper
    • C01G3/02—Oxides; Hydroxides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/60—Optical properties, e.g. expressed in CIELAB-values

Definitions

  • the present invention relates to the production of copper hydroxide, and more particularly to the conversion of copper sulphide into copper hydroxide.
  • the main object of the invention is to cheapen the recovery of copper in the form of copper hydroxide or basic copper salts from the Waste liquors resulting from the manufacture of rayon by the cupro-ammonium process.
  • the quantities of copper hydroxide required for dissolving or digesting the cellulose amount to from 50 to 65 per cent of the weight of the cellulose.
  • said part is removed therefrom by adding an equivalent amount of a suitable sulphide and by eliminating the re sultant insoluble precipitate of copper sulphide by filtration or decantation.
  • copper sulphide can, in one operation, be converted into copper hydroxide, if it is subjected to oxidizing action in the presence of caustic or other alkalis, and that, under such conditions, its tendency for oxidation becomes so strong, that the desired conversion can be quickly and completely effected by air oxidation.
  • the copper sulphide suspended in dilute caustic soda solution is aerated and agitated to efiect contact of air with the suspension.
  • the quantity of caustic soda present should be in excess of that required for forming a thiosulphate salt with the known sulphur content of the precipitate. If it is lower, it becomes increasingly difiicult to carry the reaction to its completion.
  • the acid neutralizing power of the copper hydroxide formed in the reaction is twice as great as that of the caustic soda used to produce the copper hydroxide.
  • copper sulphide itself has no acid-neutralizing value in the sense in which we are here concerned, i. e. the power of dissolving in a dilute acid, such as sulphuric acid. It can only be dissolved in a strong oxidizing acid, such as nitric -cid or aqua regla, or by fairly strong sulphuric acid in combination with an oxidizing agent such as chlorates, peroxides, etc. Heating is also necessary.
  • the former use involved digesting the copper sulphide in a hot and fairly strong solution of sulphuri acid nethod in in the presence of an oxidizing agent.
  • an oxidizing agent In the present process, not only do We eliminate the oxidizing agent and all the extra acid, but we obtain from the copper hydroxide produced a considerable part of the alkali value needed to neutralize the i'ree acid in the main copper solution. Thereiore the acid neutralizing feature dovetails into the process of copper recovery and should be considered as part of an economic whole.
  • the precipitate of copper sulphide is not pure cupric sulphide, but contains a considerable portion of cuprous sulphide. This further lowers the consumption of caustic soda in accordance with the following reaction:
  • alkalies may be used in place of caustic soda as for instance potassium hydroxide, alkaline carbonates such as sodium carbonate may also be used although the reaction in the latter case is slower.
  • the same process may be applied to copper sulphide ore.
  • the ore should be very finely powdered.
  • the treatment is carried out as described above using aeration in the presence of caustic soda solution whereupon the copper sulphide is transformed into copper hydroxide.
  • Example #1 To 1,000 lbs. of a press-cake derived from a caustic soda precipitating bath and containing about 190 lbs. of precipitated copper sulphide, the remainder by weight being substantially all water in which a little caustic soda, about 3.5%, remains from the precipitating bath, 3,600 litres water are introduced into an iron tank and the copper sulphide kept suspended by agitation.
  • the resultant copper hydroxide is washed by decantation.
  • Example #2 In the manufacture of synthetic fibres, according to the cuprammoniurn method, withdrawn alkaline precipitating liquor has to be reconditioned for circulation.
  • One of the treatments necessary for this purpose consists in removing the gain in copper by adding equivalent amount of sodium sulphide and by th n leading the liquid through various settling tanks where the insoluble copper sulphide accumulates on the bottom and istherefrom periodically withdrawn for recovery.
  • the resulting copper hydroxide is washed with water and may be further pu "ified in any known or other suitable manner.
  • the relative purity of the substances used and the relative purity of the compounds produced does not occasion departure from the spirit of my invention.
  • the copper hydroxide which is produced may be 100% pure copper hydroxide or it may be a partially dehydrated copper hydroxide, a pure copper hydroxide admixed with copper oxide in complete or stage formation.
  • the natiu'al bright blue color of the pure copper hydroxide may be tinged brown or black.
  • a process of converting copper sulphide into copper hydroxide which consists in suspending the copper sulphide in an alkaline solution of a metallic base, and agitating that solution and permeating it with air during agitation thereby yielding copper hydroxide free of acid ions.
  • a process of converting copper sulphide into copper hydroxide which consists in suspending the copper sulphide in an alkaline solution of a metallic base, and agitating that solu tion and permeating it with air during the agitation, said alkali being caustic soda thereby yielding copper hydroxide free of acid ions.
  • a process of converting copper sulphide into copper hydroxide which consists in suspending the copper sulphide in an alkaline solution of a metallic base, and agitating that solution and permeating it with air during the agitation, said alkaline solution having a concentration in excess of that required for forming a thiosulphate salt with the known sulphur content of the precipitate thereby yielding copper by droxide free of acid ions.
  • a process of recovering copper content from the precipitating liquor of the cupro-ammonium process of rayon manufacture which consists in first converting the copper content to a copper sulphide by adding an equivalent amount of a suitable sulphide and removing the resultant insoluble precipitate of copper sulphide by suitable means, suspending the copper sulphide in a solu tion of a fixed alkali, agitating the solution while permeating it with air and dissolving the resulting copper hydroxide in waste acid liquor of the same cupro-ammonium process which contains part of the original copper content in the form or" copper sulphate and a certain percentage of free acid, whereby the free acid is neutralized and the copper content more readily recovered from the solution.
  • a process of producing copper hydroxide from copper sulphide which consists in agitating while permeated with air a solution of the following proportions and general characterizations; 1,000 pounds of a press-cake containing about 190 pounds of precipitated copper sulphide and 3,000 liters of water, together with pounds of caustic soda 50 per cent; and continuing the agitation until the sample is completely soluble in acid.
  • a process of converting copper sulphide as derived from the alkaline precipitating liquor utilized in the production of rayon by the cuproammonium method which consists in agitating while permeated with air a solution of the following proportions and general characteristics; 4,000 liters of the withdrawn copper sulphide sediment of the precipitating liquor of rayon manufacture containing 275 pounds of copper sulphide and 121 pounds of caustic soda brought to an aggregate of 6,000 liters by adding water; the treatment being continued until a sample is substantially completely soluble in acid.
  • a process of recovering copper content from the precipitating liquor of the cupro-ammonium process of rayon manufacture which consists in first converting the copper content to a copper sulphide by adding an equivalent amount of a suitable sulphide and removing the resultant insoluble precipitate of copper sulphide by suitable means, suspending the copper sulphide in a solution of a fixed alkali, agitating the solution while permeating it with air and dissolving the resultant copper hydroxide in acid.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Removal Of Specific Substances (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
US11899437 1937-01-04 1937-01-04 Process of converting copper Expired - Lifetime US2165667A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US11899437 US2165667A (en) 1937-01-04 1937-01-04 Process of converting copper
DEN41496D DE708009C (de) 1937-01-04 1937-12-31 Verfahren zur Herstellung von Kupferhydroxyd
GB36237/37A GB508495A (en) 1937-01-04 1937-12-31 Improvements in or relating to processes of producing copper hydroxide
FR831545D FR831545A (fr) 1937-01-04 1937-12-31 Perfectionnements relatifs aux procédés de préparation de l'hydrate de cuivre
NL85790A NL50726C (enrdf_load_stackoverflow) 1937-01-04 1937-12-31
BE425564D BE425564A (enrdf_load_stackoverflow) 1937-01-04 1938-01-03

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11899437 US2165667A (en) 1937-01-04 1937-01-04 Process of converting copper

Publications (1)

Publication Number Publication Date
US2165667A true US2165667A (en) 1939-07-11

Family

ID=21967860

Family Applications (1)

Application Number Title Priority Date Filing Date
US11899437 Expired - Lifetime US2165667A (en) 1937-01-04 1937-01-04 Process of converting copper

Country Status (6)

Country Link
US (1) US2165667A (enrdf_load_stackoverflow)
BE (1) BE425564A (enrdf_load_stackoverflow)
DE (1) DE708009C (enrdf_load_stackoverflow)
FR (1) FR831545A (enrdf_load_stackoverflow)
GB (1) GB508495A (enrdf_load_stackoverflow)
NL (1) NL50726C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961942A (en) * 1973-11-06 1976-06-08 The United States Of America As Represented By The Secretary Of The Interior Hydrometallurgical process for copper recovery from sulfide ores

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961942A (en) * 1973-11-06 1976-06-08 The United States Of America As Represented By The Secretary Of The Interior Hydrometallurgical process for copper recovery from sulfide ores

Also Published As

Publication number Publication date
BE425564A (enrdf_load_stackoverflow) 1938-03-31
FR831545A (fr) 1938-09-07
DE708009C (de) 1941-07-10
NL50726C (enrdf_load_stackoverflow) 1941-08-15
GB508495A (en) 1939-06-30

Similar Documents

Publication Publication Date Title
DE1812332C3 (de) Verfahren zur Fällung von Mangan, Eisen und/oder Kobalt aus Lösungen derselben
US2165667A (en) Process of converting copper
US2018987A (en) Process of preparing active bleaching clays
US1691511A (en) Process of making chemical pulp
JPS6111890B2 (enrdf_load_stackoverflow)
US2168985A (en) Preparation of ikon free copper
US2974011A (en) Process of purifying beryllium compounds
US2298800A (en) Process for the production of beryllium oxide or hydroxide
US1475563A (en) Purification of brines
US2031844A (en) Manufacture of caustic soda
US2532308A (en) Process of recovering copper oxide and a d-tartrate from a spinning solution
US1912332A (en) Recovery of zinc compounds from technical zinc liquors
US1700982A (en) Gas-purification solution and process
US2333672A (en) Process of producing alkaline sulphates from ferrous sulphate
US1811142A (en) Process for the recovery of tin from alkaline stannate solutions
US1765560A (en) Process for the recovery of sodium sulphite from spent sulphite liquors
US2173895A (en) Process for producing sulphide pigments
US2493262A (en) Process of preparing basic sai
US1278257A (en) Cream of tartar from wine-lees.
US1873727A (en) Double aluminum alkali fluoride compounds
US2162176A (en) Regeneration of copper from cuprammonium artificial silk waste lyes
SU63111A1 (ru) Способ извлечени сурьмы из отработанного сурьм но-сернистого электролита
US2045625A (en) Manufacture of ferric sulphate
US1458491A (en) Method of making oxidized aromatic substances
US3167390A (en) Treatment of waste acid liquor