Mechanism of Paper Chromatography of Inorganic Ions on Impregnated Papers: Separation of Ag(I), Cu(II), Ni(II), Co(II), Hg(II), Pb(II) & Fe(III)

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Observation of energy spectrum of electron albedo in low latitude region at Hyderabad, India

The preliminary results are presented of the measurement of the energy spectrum of low energy (5-24 MeV) albedo electrons, moving upward as well as downwards, at about 37 km (-4 mb) altitude, over Hyderabad, India, in low latitude region. The flux and energy spectrum was observed by a bi-directional, multidetector charged particle telescope which was flown in a high altitude balloon on 8th December 1984. Results based on a quick look data acquisition and analysis system are presented here

Application of Physico-chemical Principles in Extraction Metallurgy

Physical chemistry has two important tools namely, thermo-dynamics which indicates the possibility of a reaction, and kinetics giving the rate at which a reaction proceeds. This paper indicates how these tools can profitably by utilized for the extraction of metals. The authors illus-trate as to how physical chemistry has been helpful in the clear understanding of the high-temperature reactions and in searching out new methods for metal-winning. A fer instances where thermo-dynamic data have been applied for developing scientific extraction methods are pointed out and their limitations indicated. The instances cited include the separation of nickel and zinc from a mixture of their oxides, the preparation of titanium tetraoxide and the development of Pidgeons process for the production of magnesium

Vaccum - A New Tool in Extractive Metallurgy

Theoretical considerations involved in metal extraction reactions under vacuum have been discussed.The general advantages of carrying out reactions under vacuum are derived from the lowered temperature for reaction and the possibility of carrying reactions to completion, by the removal of one of the reaction products. The conditions for the reduction and dissociation of oxides, sulphides, halides, hydrides and nitrides are discussed and various examples cited of reactions of this type adopted for metal-winning

Propagation of a bore produced by the sudden break of a dam

In this paper we study the progress of a bore, produced by the sudden break of a dam, when there is a flow of water ahead of the dam and the bed has a mild slope and offers resistance, employing Whitham's rule. We first derive certain interesting results from the general discussion of the differential equation, expressing the variation of the bore strength with the undisturbed Froude number, M0, ratio of bedslope to bed resistance, gα/R = a2 and the bore strength M(x) Ξ {h(x)/h0(x)} where h(x) and h0(x) are the bore height and the undisturbed height of the water immediately ahead of the bore, the horizontal distance x being measured from the dam. The parameters M0 and a2 combine to influence the bore strength in a very special way. We also examine the asymptotic cases when the bore strength M and M 1. The intermediate cases are investigated numerically to bring out the effects of the parameters, α, a2, M0 and the dam height on the strength of the bore, its velocity and the fluid velocity behind it

Nickel Resources in India and their Exploitation

NICKEL is one of the important strategic alloying elements : its consumption has increased considerably after World War II and during the last few years it increased by 6U-70°,,. It is felt that the increase would have been still higher if more nickel was available. The present annual production outside the communist block has well exceeded 400 000 tons and there is every likelihood of further rise in production in the near future as new production centres are being established. The largest single producer of nickel is Canada with the world's richest deposits at Sudbury, Ontario