RECOVERY OF NICKEL FROM NICKEL SULFATE SOLUTIONS

The recovery of Ni, Co, Zn and/or Cu from sulphate solns. contg. them is carried out by simultaneously introducing H2S and a calceferous base into the soln. in amts. such that the dissolved metal is pptd. as sulphide at the same time as CaSO4 is pptd., maintaining the soln. at a pH of 2.5-3.5, and s...

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Bibliographische Detailangaben
Hauptverfasser:	AGAR, GORDON E, TIPMAN, ROBERT N, YAWNEY, DENNIS B
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS FERROUS OR NON-FERROUS ALLOYS INORGANIC CHEMISTRY MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLIDMATERIALS OR FLUIDS METALLURGY PERFORMING OPERATIONS PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The recovery of Ni, Co, Zn and/or Cu from sulphate solns. contg. them is carried out by simultaneously introducing H2S and a calceferous base into the soln. in amts. such that the dissolved metal is pptd. as sulphide at the same time as CaSO4 is pptd., maintaining the soln. at a pH of 2.5-3.5, and subjecting the ppte. to forth flotation to isolate the sulphides. The process can be used to isolate the metals from sulphate solns. obtd. by oxidising sulphide ores. Inexpensive lime (limestone, qicklime or slaked lime) is used; good sepns. can be achieved in large-scale operations (e.g. with >99% of the metal recovered in the concentrate). A suitable starting soln. contains 5-50 g Ni/1. Pptn. is pref. effected at 40-80 degrees C (esp. 50-75 degrees C) using limestone. In a continuous process, pptn. is effected in a series of tanks through which the soln. is circulated in countercurrent to the H2S, the lime being added to each tank so as to maintain a pH of 2.5-3.5. After pptn., the mixt. is pref. degassed by reducing the ambient pressure, the H2S-risk gas obtd. being recycled to the pptn. step. The mixt. can then be concd. to form a thick slurry, or the ppte. can be filtered off and slurried in H2O. Flotation is pref. effected in the presence of a sulphhydryl collector, e.g. K amyl xanthate.