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Download Advances in Chemical Engineering, Vol. 9 by Thomas B. Drew (ed.), Giles R. Cokelet (ed.), John W. Hoopes PDF

By Thomas B. Drew (ed.), Giles R. Cokelet (ed.), John W. Hoopes (ed.), Theodore Vermeulen (ed.)

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Use of a continuous bench scale reactor wit1 peraturr of 1 ~ 2 0 0 ° C The a capacity of 2 kg ore/hr resulted in a 95% uranium dissolution a t 180°C and 40 psi oxygen partial pressure with a retention time of only 50 min. N o s t of the common metals such as copper, zinc, lead, molybdenum nickel, and cobalt are produced from their sulfide minerals. These ores art usually upgraded by standard mineral benefication techniques. The presenl benrficiation techniques are in most instances close to their upper limit o efficiency.

S15) examined the current state of the art for the solution mining of uranium. In a large-scale operation, the problems of preventing the loss of solvent from the mining area and the recovery of the pregnant liquor are the major considerations. The complexity of the ore-solutionfluid flow interaction in the reservoir fractures, fissures, and heterogeneities can probably be solved by the creation of hydrodynamic barriers. , by the petroleum industry are applicable to solution mining. Davis (D2) reported the results of a field test that involved the isolation of a uranium ore body by surrounding it with a curtain of grout material.

Compressed air waa introduced into the thickeners to dissolve the nickel and oxidize and precipitate the iron in solution. The ammonia saturated air from the thickeners was passed through absorption towers where it, was scrubbed with water to recover the ammonia. The lead sulfide present in the ores, concentrates, or mattrs is converted to lead sulfate, lead monoxide, or a basic lead sulfate by roasting or by oxidation in aqueous suspension. Lead carbonate can bc treated by thermal decomposition or acid treatment.

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