Results 191 to 200 of about 469 (250)
Selective Reduction of Esters to Access Aldehydes Using Fiddler Crab-Type Boranes. [PDF]
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Journal AWWA, 1957
THE principal items of cost in fluoridating public water supplies are the chemicals, the feeding equipment, and labor; of these, the chemical costs are by far the greatest. Consequently, if the cost of chemicals were reduced, the fluoridation procedure would be an even smaller factor economically. The greatest reduction of such costs can be achieved by
Franz J. Maier, Exvin Bellack
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THE principal items of cost in fluoridating public water supplies are the chemicals, the feeding equipment, and labor; of these, the chemical costs are by far the greatest. Consequently, if the cost of chemicals were reduced, the fluoridation procedure would be an even smaller factor economically. The greatest reduction of such costs can be achieved by
Franz J. Maier, Exvin Bellack
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Evaluating fluorspar for fluoridation
Journal AWWA, 1996Data from this study indicate that fluoridation with natural fluorspar could be practical if the raw water is of an appropriate quality.There has been concern about the availability of commercial fluoride chemicals for publicly fluoridated water, coupled with potential problems of overdosing.
Ching‐Gang Peng +2 more
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Proceedings of the Yorkshire Geological Society, 1955
Summary The paper presents an account of the mineralogy, geological occurrence and history of the blue and white banded fluorspar found near Castleton in Derbyshire. Blue John is shown to be a fluorspar, coloured by bituminous inclusions, deposited as cavity-linings and replacements in Carboniferous Limestone of reef and massif facies ...
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Summary The paper presents an account of the mineralogy, geological occurrence and history of the blue and white banded fluorspar found near Castleton in Derbyshire. Blue John is shown to be a fluorspar, coloured by bituminous inclusions, deposited as cavity-linings and replacements in Carboniferous Limestone of reef and massif facies ...
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The Worldwide Availability of Fluorspar
Natural Resources Forum, 1987This paper reviews a recent assessment of fluorspar reserves and resources for 13 market economy countries and the People's Republic of China, and how they relate to the overall availability of fluorspar on the world market. Current world production, consumption and world trade issues are discussed.Nearly 5 million tonnes of fluorspar were produced in ...
C. C. KILGORE, L. PELHAM
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1961
Fluorspar, a non-metallic mineral hitherto used largely as a flux, has become the basic source material for an active and growing chemical industry producing chemicals and materials with unique characteristics of great value to industry. These materials are finding such large-scale, diverse and essential applications that marked increases in demand are
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Fluorspar, a non-metallic mineral hitherto used largely as a flux, has become the basic source material for an active and growing chemical industry producing chemicals and materials with unique characteristics of great value to industry. These materials are finding such large-scale, diverse and essential applications that marked increases in demand are
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Chemical & Engineering News Archive, 2010
IN JUNE 2009, the U.S. asked the World Trade Organization (WTO) to help settle a dispute over Chinese export restraints on industrially important raw materials. One of those was fluorspar, a mineral that is an essential raw material in the production of a wide variety of fluorine-containing products including refrigerants, coatings, foam-blowing agents,
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IN JUNE 2009, the U.S. asked the World Trade Organization (WTO) to help settle a dispute over Chinese export restraints on industrially important raw materials. One of those was fluorspar, a mineral that is an essential raw material in the production of a wide variety of fluorine-containing products including refrigerants, coatings, foam-blowing agents,
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URANIUM CONTENT AND LEACHABLE FRACTION OF FLUORSPARS
Health Physics, 2000Much attention in the radiological health community has recently focused on the management and regulation of naturally occurring radioactive materials. Although uranium-bearing minerals are present in a variety of fluorspar deposits, their potential consideration as naturally occurring radioactive materials has received only limited recognition.
E R, Landa, T B, Councell
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Nature, 1953
IT has been shown in previous publications1 that at least some of the maxima in the absorption spectra of natural coloured fluorites coincide with those obtained by artificial irradiation, thus completing the proof that the natural colour is due chiefly to radioactivity.
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IT has been shown in previous publications1 that at least some of the maxima in the absorption spectra of natural coloured fluorites coincide with those obtained by artificial irradiation, thus completing the proof that the natural colour is due chiefly to radioactivity.
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Use of Fluorspar in Water Fluoridation
Journal of Environmental Engineering, 1996This paper describes work aimed at investigating the physico-chemical factors influencing the fluorspar dissolution kinetics, with the objective of evaluating the feasibility of fluorspar as a source of water fluoridation. Experimental results indicated that under optimum conditions effluent fluoride concentrations well above 2 mg/L were obtained ...
Ching-Gang Peng, Jian Qi, Alan J. Rubin
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