NOPR Collection:

Increased metal tolerance by Thiobacillus ferrooxidans (SRco) isolated from Ambamata complex ore mine

Thu, 01 Jun 1995 00:00:00 GMT

Title: Increased metal tolerance by Thiobacillus ferrooxidans (SRco) isolated from Ambamata complex ore mine Authors: Dave, S R; Pandhi, N D Abstract: Two isolates of T. ferrooxidans (SRco) cultures 1 and 2 have been developed to tolerate Cd²⁺, Co²⁺, Cu²⁺ and Ni²⁺ in different conditions. Cadmium, in the form of cadmium sulphate, has been found to be most tolerated by the organisms, followed by copper, nickel and cobalt in the form of sulphate salts. Ni²⁺ and Co²⁺ are tolerated equally by the organisms, but organisms needed more time to oxidize 95% Fe²⁺- Fe³⁺ in presence of Co²⁺ as compared to Ni²⁺. Cu²⁺ is found to be most inhibitory even at low concentrations while Co²⁺ shows inhibitory action at higher concentration. Isolates have been developed to tolerate as high as (and show 95% iron oxidation) 1.75, 1.527, 1.254 and 1.254% (correspond to 16, 24, 21, 21 mM) cadmium, copper, nickel and cobalt, respectively. Page(s): 139-141

Preparation of anhydrous FeF₃ by solid state reaction of iron oxide with ammonium hydrogen fluoride

Thu, 01 Jun 1995 00:00:00 GMT

Title: Preparation of anhydrous FeF₃ by solid state reaction of iron oxide with ammonium hydrogen fluoride Authors: Juneja, J M; Singh, Sohan; Adhyapak, S V; Rao, U R K Abstract: The preparation of anhydrous F_eF₃ has been investigated by solid state reaction of Fe₂O₃ with NH₄HF₂. The reaction has been studied in both vertical and horizontal reactors. The difficulties encountered in carrying out the reaction upto 50g charge scale are discussed. The horizontal reactor provides better control of the kinetic factors than the vertical reactor. Page(s): 136-138

Studies on portland blast-furnace slag cement with limestone as a retarder

Thu, 01 Jun 1995 00:00:00 GMT

Title: Studies on portland blast-furnace slag cement with limestone as a retarder Authors: Salem, Th M; EI-Didamonyh, H; Mohamed, T A Abstract: Portland blast-furnace slag cement pastes with 5% limestone as a retarder have been investigated. The hydration kinetics measured from the free lime and combined water contents as well as mechanical properties have been determined. The results revealed that the limestone can be used instead of gypsum as a retarder. The limestone increased the pH value of the hardened cement paste. The increase of slag content decreases the water of consistency and increases the setting time. In addition, the increase of slag content tends to decrease the combined water as well as free lime contents. The slag content has slight effect on the mechanical properties. Page(s): 132-135

Composite plate analysis for ship's hull

Thu, 01 Jun 1995 00:00:00 GMT

Title: Composite plate analysis for ship's hull Authors: Satsangi, S K Abstract: Composites are widely used in shipbuilding for reducing the hull weight so that with the installed power greater speed can be achieved. The vessels are built in accordance with the various Classification Society Rules which in most cases lead to conservative designs, however, the basis of the rules prohibits to utilize the properties of the material to its fullest. In the present paper, an attempt has been made to analyze a composite plate under bending by evaluating the properties of each lamina from the properties and quantities of the constituent materials. Page(s): 125-131

NOPR Collection:

Increased metal tolerance by Thiobacillus ferrooxidans (SRco) isolated from Ambamata complex ore mine

Preparation of anhydrous FeF3 by solid state reaction of iron oxide with ammonium hydrogen fluoride

Studies on portland blast-furnace slag cement with limestone as a retarder

Composite plate analysis for ship's hull

Preparation of anhydrous FeF₃ by solid state reaction of iron oxide with ammonium hydrogen fluoride