104 research outputs found
An Interactive Dialogue for the Creation, Maintenance and Querying of a Data Base Representative of the Anatomy of an Administrative System
No full textTitle: An Interactive Dialogue for the Creation, Maintenance and Querying of a Data Base Representative of the Anatomy of an Administrative System, Author: Pratima Mathur, Location: ThodeThe logical structure of a database is given, and is
representative of the anatomy of an administrative system,
and of the personnel organization by which it is operated.
This project will adopt an appropriate host computer,
terminal, and physical representation of the database, for
the main purpose of developing a user-terminal dialogue by
which the database can be created and maintained. The
dialogue should be as easy and flexible to use by an audit
analyst as is possible, while at the same time imposing a
systematic and disciplined approach to the task.ThesisMaster of Science (MS
Strategies for Recycling of Primary and Secondary Resources for Germanium Extraction
No full textIn this review, availability of germanium in primary and secondary resources and its recovery from these resources are presented. With nearly 40% germanium consumed in fiber optics and scarcity of resources, the global consumption outplays the primary production. Germanium exists as a substituted element in zinc sulfide matrix of lead-zinc sulfides and lignites. Nearly 60% of the germanium supply is met by zinc refining residues, and about 20-30% of germanium is produced from coal and its by-products. Germanium recovery from various resources such as zinc plant residues, coal and coal plant waste, spent optical fibers, and copper flue dust has been examined. Bioleaching was exploited by few researchers to extract germanium from zinc sulfides, sulfide tailings, jarosite, coal fly ash, and flue dust. This review covers the various work carried out by different chemical separation processes, viz., chemical precipitation, solvent extraction (SX), ion exchange (IX), and membrane processes, as well as biological approaches
Recovery and Recycling of Cerium from Primary and Secondary Resources- a Critical Review
No full textVarious processes for the recovery of cerium from metallurgical, non-metallurgical and secondary sources are reviewed. Cerium is present as a major constituent of primary resources like monazite, bastnäsite, etc. Various secondary resources of cerium include phosphogypsum, red mud, blast furnace slag, NiMH batteries, FCC catalyst, glass films, CFLs, catalytic converters, etc. This review encompasses the research carried out for the extraction of cerium by pyro-hydrometallurgical methods followed by separation and purification with flowsheets. Also are enlisted in various processes like solvent extraction, ion exchange, membrane adsorption, ionic liquids, carbon-based nanomaterials, used for purification of cerium from the solution. Besides, the alternate methods to prepare cerium salts like fused salt electrolysis and metallothermic reduction are described
An Overview of the Recent Status of Critical and Strategic Metal Production and Development in India
No full textMaterial Recycling: Unearthing Metals from Anthropogenic and Industrial Resources
No full textGiven the need to achieve sustainability in material processing, the present chapter emphasizes exploring secondary resources as sustainable alternates to primary ores via replenishment cum recycling of anthropogenic and industrial wastes. These resources often contain metals in lower values except in a few cases like WEEEs; but processing of such is benign to the environment, economical, and ensures extended producer responsibility
Battery Recycling- Charged with Huge Potential
No full textGiven the availability of used batteries across the country, their recycling will provide India a viable and attractive option to address an acute shortage of critical metals required for the country which is on the cusp of unprecedented development and growth, this article provides insights on the values hidden in these spent batteries and various process developed at CSIR-NML
Global Outlook on the Availability of Critical Metals and Recycling Prospects from Rechargeable Batteries
No full textRecovery of Rare Earth Elements from Metallurgical Wastes
No full textThe metallurgical wastes from ferrous and nonferrous
industries contain several valuable base, rare and rare earths elements. The common of these are red mud, fly ash, steel slag, and other which are mostly dumped or still demanding huge consumption. This chapter presents works carried out globally and the various features of the wastes that make them suitable for rare earth extraction. Several processing options used globally to treat such discarded materials are presented in vogue. This chapter also addresses the demerits of waste disposal, world distribution of such resources and the current operations to tackle these wastes in the pursuit of value recovery
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