Hydrometallurgical treatment

Ura.nium, The hydrometallurgical treatment of uranium ores is a concentration and purification process. Typical ore grade is 0.1—0.5% U Og, and pregnant solutions contain ca 1 kg/m of U Og. The dissolution requires the presence of an oxidant, either oxygen or a ferric salt. 

Some deposits in addition to REO contain zircon and titanium minerals. From these ores, REO and zircon can be recovered in bulk concentrate suitable for hydrometallurgical treatment. 

The first step in the hydrometallurgical treatment is leaching the feed material with an ammoniacal solution. Metals such as copper, nickel, and zinc form metal ammonium complexes and will therefore dissolve in the leach solution. Other metals like iron and chromium form insoluble hydroxides and will be found in the residue. This residue is dried and treated in the induction converter. Copper and nickel are separated from the filtered leach... 

Hydrometallurgical treatment of lateritic ores, by the reduction roast/ammonia leach process is one of the methods used for the recovery of nickel from low grade lateritic ores. In a recent study Chander and his associates (19, 20) used such... 

In Table 5 you ll find properties of some alloys on LaNj -basis produced under industrial conditions designed for each alloy depending on its physical and chemical properties charge composition, temperature of its treatment and time of isothermic exposure, procedures of hydrometallurgical treatment of reaction products. 

Derivation (1) A precipitate from the addition of sodium carbonate to a solution of a manganese salt (2) hydrometallurgical treatment of manganiferrous iron ore. 

Typical scrap materials for hydrometallurgical treatment are grinding sludges, floor sweepings, contaminated powder qualities, tungsten-copper, and solid pieces, which can be dissolved by electrolysis. 

S.R Fugleberg and Poijarvi, Hydrometallurgical Treatment of Soluble Silicate-bearing Zinc Materials , US Pat.4.148.862.10 April 1979 (Outokumpu Oy). 

FIGURE 16 A conceptual flow of the hydrometallurgical treatments for the metal recovery from spent NiMH batteries involving sulfuric add leaching (Yoshida et al., 1995). 

D. Weston, Hydrometallurgical Treatment of Nickel, Cobalt and Copper Containing Materials , United States Patent 3,793,430, 19 February 1974. 

J. Agin, Y. Le Quesne, B. Berthomieu, Process for the Hydrometallurgical Treatment of a Lateritic Nickel/Cobalt and Process for Producing Nickel and/or Cobalt Intermediate Concentrates or Commercial Products Using It, United States Patent Application 2010/0098608, 22 April 2010. 

Hydrometallurgical treatment for laterites has increased due to the importance these deposits have gained as sources of nickel and cobalt [1, 2]. In recent years many researchers have studied different ways to extract nickel and cobalt by ammoniacal or acidic solution leaching. 

The mineralogical form of the cobaltic oxide, asbolane or heterogenite, has nearly no impact on the pyrometallurgical treatment of this type of ore. On the contrary, the Mn content in asbolane has a serious impact on its hydrometallurgical treatment. It will require more reagents for leaching and a Mn removal step. This could be done by selective Mn precipitation by SO2/O2, by SX or by selective Co precipitation as hydroxide. 

Recent process development work for the recovery of copper, nickel, cobalt and precious metals (Au, Pt, Pd) from PolyMet s NorthMet deposit is described. The process uses a number of flotation process steps combined with hydrometallurgical treatment to produce a range of possible products including copper and nickel flotation concentrates for custom smelting, mixed nickel and cobalt hydroxide for refining and a precious metal precipitate for treatment. 

Matthew, I. G. and Eisner, D. 1977. The hydrometallurgical treatment of zinc silicate ores. Met. Trans. B 8B 73-83. 

Demarthe, J M and Georgeaux, A, 1980. Hydrometallurgical treatment of lead concentrate, in Proceedings Lead-Zinc-Tin 80, pp 426-444 (The Minerals, Metals and Materials Society (TMS) Warrendale and American Institute of Mining, Metallurgical and Petroleum Engineers (AIME) Littleton). 

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