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Author : Jens Götze
Publisher : MDPI
Page : 275 pages
File Size : 40,5 Mb
Release : 2018-11-20
Category : Electronic books
ISBN : 9783038973485
This book is a printed edition of the Special Issue "Mineralogy of Quartz and Silica Minerals" that was published in Minerals
Author : Reigart Meredith Santmyers
Publisher : Unknown
Page : 20 pages
File Size : 41,5 Mb
Release : 1931
Category : Quartz
ISBN : UOM:39015077576679
Author : F. Rice,World Health Organization
Publisher : Unknown
Page : 62 pages
File Size : 45,8 Mb
Release : 2000
Category : Drugs
ISBN : MINN:31951D01789356A
A concise assessment of the adverse effects on human health caused by exposure to quartz the most common form of crystalline silica. Quartz is a frequently occurring solid component of most natural mineral dusts. Human exposure occurs most often during occupational activities involving movement of earth disturbance of silica-containing products such as masonry and concrete or use or manufacture of silica-containing products. As respirable quartz dust particles can be inhaled and deposited in the lung the report gives particular attention to evidence of an increased risk of lung cancer in occupationally exposed workers. Most studies in laboratory animals have concentrated on adverse effects associated with long-term inhalation of particles. Effects observed include cellular proliferation nodule formation suppressed immune function and alveolar proteinosis. While exposure clearly induces pulmonary tumours in one species other species show less or no malignant tumour response. The evaluation of risks to human health draws on a large number of epidemiological studies of workers exposed to respirable quartz dust. Occupational exposure has been linked to an increased incidence of silicosis ung cancer and pulmonary tuberculosis. Studies have also documented statistically significant increases in cases of bronchitis emphysema chronic obstructive pulmonary disease autoimmune-related diseases including scleroderma rheumatoid arthritis and systemic lupus erythematosus and renal disease. In reviewing these findings the report underscores several uncertainties inherent to the study of respiratory diseases in occupational populations that complicate the assessment of risks associated with exposure to quartz dust. The need for improved methods of exposure assessment and data analysis is stressed.
Author : Reigart Meredith Santmyers
Publisher : Unknown
Page : 22 pages
File Size : 48,6 Mb
Release : 1931
Category : Quartz
ISBN : UOM:39015077576828
Author : Society for Mining, Metallurgy, and Exploration (U.S.)
Publisher : SME
Page : 57 pages
File Size : 50,8 Mb
Release : 1998
Category : Medical
ISBN : 9780873351669
In practical language, Crystalline Silica addresses what crystalline silica is, where it is found and used, and how it is identified. In addition, the book discusses the regulatory decisions yielding new interest in this ubiquitous substance and presents an overview of the techniques used to determine its presence and abundance. A list of selected readings and supplemental resources and a glossary of terms beyond the scope of this publication round out the text.
Author : Jens Götze,Winfried Zimmerle
Publisher : Unknown
Page : 106 pages
File Size : 52,5 Mb
Release : 2000
Category : Nature
ISBN : STANFORD:36105029509689
Author : Peter J. Heaney,Charles T. Prewitt,Gerald V. Gibbs
Publisher : Walter de Gruyter GmbH & Co KG
Page : 624 pages
File Size : 53,8 Mb
Release : 2018-12-17
Category : Science
ISBN : 9781501509698
Volume 29 of Reviews in Mineralogy provides an updated silica review which focuses on the most recent developments. This book describes the crystal structures and phase transitions of silica and its stuffed derivatives; bridges the relationship between the microstructural character of real silica minerals and the behavior of silica in the geological environment; covers Quantum mechanical considerations of the Si-O bond; shows how calculations based upon first-principles theory can explain and predict silica transitions at high temperatures and pressures; covers spectroscopic analyses of silica and how they reveal vibrational behaviors in response to variations in temperature, pressure, and composition and finally details the uses of silica for industrial purposes.
Author : M. A. Vos
Publisher : Ontario, Ministry of Natural Resources
Page : 48 pages
File Size : 55,9 Mb
Release : 1981
Category : Nature
ISBN : STANFORD:36105032019130
Author : Raymond Bardeen Ladoo
Publisher : Unknown
Page : 8 pages
File Size : 49,5 Mb
Release : 1922
Category : Diatomaceous earth
ISBN : UOM:39015086555227
Author : Byron R. Berger,Byron Berger
Publisher : Unknown
Page : 334 pages
File Size : 51,9 Mb
Release : 1985
Category : Nature
ISBN : UOM:39015010199589
Author : Thomas Vert
Publisher : John Wiley & Sons
Page : 387 pages
File Size : 40,6 Mb
Release : 2016-05-02
Category : Technology & Engineering
ISBN : 9781119219866
The first book since 1974 written by a steelmaking end user and refractory engineer Why do you pick the refractory you do? How do you choose? Where do you start the selection process? The answers to these questions must always take into account the balance of competing interests among operations, purchasing, and the suppliers. Refractory Material Selection forSteelmaking is the ultimate guide to finding ideal answers to these questions. By following the step-by-step instructions—paired with detailed explanations and full-color diagrams—readers will be able to critically select the materials that are most appropriate for them. This book considers: The goals of refractory selection What causes refractories to wear out The properties of refractories and their raw materials Specific refractory applications Key strategies used to procure refractories Tom Vert's 25 years of experience in steelmaking combined with a ceramic engineering background provide comprehensive information that will benefit anyone working with refractories in steelmaking or any other industry.
Author : Sarkis G. Ampian,Robert L. Virta
Publisher : Unknown
Page : 36 pages
File Size : 44,7 Mb
Release : 1992
Category : Silica
ISBN : UOM:39015095077429
In 1987, the International Agency for Research Against Cancer conducted a review of the health literature and concluded that crystalline silica was a probable human carcinogen. As a result of this finding, OSHA was required to regulate crystalline silica under its Hazard Communication Standard (HCS). The standard requires that all materials handled by OSHA-regulated facilities be labeled according to the requirements of HCS and that workers receive proper training on the handling of the material if the crystalline silica content equals or exceeds 0.1 weight percent (0.1%). MSHA currently is considering enacting its own HCS. This will be similar to OSHA's HCS. If the standard is enacted, most mineral producers will have to determine the respirable monitor filter and bulk crystalline silica contents of their ores and products so that workers and/or customers will know whether they are in compliance with the 0.1% HCS and/ or the OSHA permissible exposure level (PEL) of 50 micro-g for an 8-hour workday for respirable crystalline silica as determined from monitor samples. Two major concerns with the HCS are the widespread occurrence of crystalline silica in nature and the suitability of current technology for routinely determining crystalline silica concentrations at the 0.1% HCS level. Most ores are extracted from silica-bearing deposits, and silica is a common constituent of rocks and soils. OSHA's HCS will have the greatest impact on the producers of crushed stone, diatomite, dimension stone, gravel, industrial sand, perlite, pumice, pyrophyllite, sand, and talc because these materials frequently are shipped directly from the mill to the customer. MSHA's HCS would affect nearly all mineral producers. Those producers that have crystalline silica present in concentrations near the 0.1% cutoff point will have the most difficulty with the analysis. Crystalline silica can be quantified at the 0.1% level by X-ray difractometry in simple systems containing one, two, and possibly three minerals if (l) none of the accessory minerals has X-ray diffraction reflections that coincide or overlap with those of crystalline silica and (2) the standard has a particle size distribution and crystallinity similar to those of the sample. In some instances, it may not be possible to determine the crystalline silica content of a sample with any degree of certainty using the recommended regulatory protocol. In all cases, it is recommended that a qualified mineralogist identify the minerals in a sample prior to any regulatory analysis. Additionally, the uncertainty as to whether some silica polymorphs should be classified as crystalline or noncrystalline and the suitability of metastable high-temperature standards, such as cristobalite and tridymite, for regulatory analysis at ambient temperatures should be addressed further. This overview is written both to highlight these problems and to serve as a guide for analysts, regulators, and industry personnel who are involved in the crystalline silica issue. It also covers some of the difficulties and/or shortcomings in quantifying crystalline silica, such as the ubiquitous mineral quartz, in the workplace.
Author : Nan C. Jensen
Publisher : Unknown
Page : 44 pages
File Size : 54,7 Mb
Release : 1942
Category : Silica
ISBN : UOM:39015074126718
Author : Anonim
Publisher : Unknown
Page : 68 pages
File Size : 55,9 Mb
Release : 1992
Category : Silica
ISBN : MSU:31293012300731
Author : I. Fanderlik
Publisher : Elsevier
Page : 305 pages
File Size : 46,6 Mb
Release : 2013-10-22
Category : Technology & Engineering
ISBN : 9781483291680
In terms of chemical composition, silica glass is the simplest amorphous substance that has been commercially utilized in many fields of application in a number of industrial branches, thanks to its physico-chemical properties. The present volume gives a comprehensive overview on the latest developments in glass technology. The influence of genetic types of raw materials on the choice of melting technology is discussed. Phase transformations of quartz-silica glass and the influence of the impurities of melting furnaces and furnace material is examined. The quartz raw materials suitable for the manufacture of clear, opaque and synthetic silica glasses, various manufacturing processes, the physico-chemical properties of silica glasses and their utilization in technological practice are reviewed in detail. The book provides a wealth of detailed information on the properties and use of silica glass which will be of considerable interest to workers in the glass industry, including those in research and development, as well as to people in the fields of electronics, electrical engineering, communication technology, optics and the chemical, power engineering and metallurgical industries. It will also be a useful information supplement on the properties and applications of silica glass for students in technical schools and universities.
