Modeling community asbestos exposure near a vermiculite processing facility: Impact of human activities on cumulative exposure John L. Adgate, Sook J.A. Cho, Bruce H Alexander, Gurumurthy Ramachandran, Katherine K. Raleigh, Jean Johnson, Rita B. Messing, A. L. Williams, James Kelly, Gregory C. PrattWeb
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Exfoliated vermiculite is formed by heating the ore to approximately 2,000 degrees Fahrenheit (oF), which explosively vaporizes the water in the mineral structure and causes the vermiculite to expand by a factor of 10 to 15 [7]. The Ellwood City facility produced exfoliated vermiculite. Detailed process information was not available for the ...Web
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Vermiculite ore from a mine near Libby, Montana, is known to be contaminated with amphibole asbestos (primarily winchite, richterite, and tremolite), which is liberated in the mining and processing of the ore [Agency for Toxic Substances and Disease Registry (ATSDR) 2008; Meeker et al. 2003].The mining and processing of …Web
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drying in rotary or fluid bed dryers, and expansion by exposure to high heat. All mined vermiculite is dried and sized at the mine site prior to exfoliation. Crude Ore Processing - Figure 11.28-1 is a process flow diagram for vermiculite processing. Crude ore from open-pit mines is brought to the mill by truck and is loaded onto outdoor ...Web
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Vermiculite, a naturally occurring mineral, was mined and processed in Libby, Montana, from the early 1920s until 1990. We now know that this vermiculite, which was shipped to many locations around the United States for processing, contained asbestos. The National Asbestos Exposure Review (NAER) is a project of the Agency for ToxicWeb
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EPA staff toured the Scotts facility and viewed the vermiculite exfoliation process in 2000 [3]. The following description summarizes the process observed during that visit; it may not represent processes used before 2000. The exfoliation process is no longer used at the facility; vermiculite was phased-out from the products in 2001.Web
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South Carolina is the largest producer of vermiculite in the United States, which poses a threat to state residents. Although the mineral is not dangerous, vermiculite ore often contains large amounts of asbestos. People who worked at or lived near vermiculite mines or vermiculite processing facilities may have been exposed to …Web
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The various grades of milled vermiculite contained asbestos at concentrations ranging from 0.3% to 7.0% (Atkinson et al., 1982). This milled vermiculite was the material shipped throughout the country. Most of the vermiculite was shipped to facilities around the country for exfoliation, a process that is similar to popping popcorn.Web
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activity-based modeled exposure estimates for vermiculite processing waste contact. We modeled associations between pleural abnormalities and asbestos exposure using …Web
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The six-digit source classification code (SCC) for vermiculite processing is 3-05-033. Vermiculite ore is mined using open-pit methods. Beneficiation includes screening, flotation, drying in rotary or fluid bed dryers, and expansion by exposure to high heat. All mined …Web
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Libby, MT, USA, was the home to workers at a historical vermiculite mining facility and served as the processing and distribution center for this industrial product that was contaminated with ...Web
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activity-based modeled exposure estimates for vermiculite processing waste contact. We modeled associations between pleural abnormalities and asbestos exposure using multiple logistic regression to adjust for year of birth, , and potential occupational asbestos exposure. r. e s u l t s: Radiographs were obtained for 461 participants.Web
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received vermiculite from the Libby, Montana, mine. From 1951 to 1964, the site was leased the site to the Ari-Zonolite Company. Following the removal of the vermiculite concentrate processing equipment in 1964, several businesses have occupied the site. None of these businesses were involved in vermiculite processing activities. The lastWeb
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The Glendale plant closed in 1964 and the Phoenix plant stopped processing Libby vermiculite in 1992. The public health consultations for the both sites are available for review at: Glendale Main Library 5959 W. Brown St. ... community members can contact Environmental Health Community Coordinator Jennifer Botsford, AZDHS, …Web
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Vermiculite Processing Operations in Northeast Minneapolis. ... People who had direct contact with the waste were probably exposed to asbestos fibers. Samples show that the waste contains up to 10% Libby asbestos. Activities such as playing on the piles, or shoveling and moving the waste rock cause asbestos fibers to be released into the air. ...Web
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where Libby vermiculite had been reportedly processed. As part of this investigation, EPA visited the Vermiculite Northwest/W.R. Grace plant in March 2000 and collected soil, dust, and air samples inside the former plant. EPA identified Vermiculite Northwest/W.R.Grace as a site for further investigation as a result of this sampling effort.Web
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Collaborating to promote vermiculite. Encouraging and promoting best practices. Dedicated to safety, integrity and honesty. Vermiculite is one of the world's most versatile minerals. It has a wide range of uses in …Web
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AP-42 Background Document for Section 11.28 Vermiculite Processing. April 6, 1993. Date: (Revised: January 24, 1995) (Finalized April 13, 1995) Subject:Background Information for Proposed AP-42 Review and Update of Mineral Products Industry Chapters 11 and 12 of AP-42 EPA Contract 68-D2-0159, Work Assignment MRI Project 4602-01.Web
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Table 3.5 lists the properties of vermiculite and some of the common smectite minerals found in nature. Layer structure and composition have much in common with mica group minerals (Fig. 3.13).The distinguishing properties of these clay minerals are: layer charge, accessible particle size (i.e., largely or exclusively confined to the clay-size fraction), and …Web
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the piles of vermiculite processing waste, as access to the site was not restricted. The prox-imity of the neighborhood to the plant and the opportunities for contact with the waste rock created a scenario for substantial non-occupational exposure to asbestos. Responding to residential concern in 2000 (Gordon 2000), the MDH and ATSDR initi-Web
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time purchased the vermiculite mine and associated processing facilities in Libby, MT. The plant produced vermiculite prod-ucts from ore mined and processed in Libby through the use of two expansion furnaces, which heated the ore to approx-imately 2000 F. W. R. Grace documents indicate that whileWeb
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operating, such as exposure from plant emissions and from contact with piles of vermiculite and waste rock on the site, have been eliminated. In the past, community members or workers may ... The Texas Vermiculite Company may have started processing vermiculite at the site as early as 1953, when they acquired the lease to the …Web
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The objective of this analysis was to estimate potential cumulative asbestos exposure for all non-occupationally exposed members of this community. Questionnaire data from a …Web
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In order to obtain expanded vermiculite products, the processing procedure of vermiculite involves six main steps: crushing, screening, magnetic separation, preheating, roasting, and cooling. 1. Crushing process. To prepare vermiculite for roasting and various applications, it must be crushed using various crushers to achieve the …Web
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Vermiculite was mined and processed in Libby, Montana, from the early 1920s until 1990. We now know that this vermiculite, which was shipped to many locations around the U.S. for processing, contained asbestos. The National Asbestos Exposure Review (NAER) is a project of the Agency for Toxic Substances and Disease Registry (ATSDR).Web
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We also measured the water contact angle for sodium vermiculite (NaV) and obtained a similar value (52 ± 1°) to that of KV (Supplementary Fig. 5).Web
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Workers at the former Zonolite/W.R. Grace vermiculite processing plant in St. Louis, operating from the late 1940s to 1988, were exposed to asbestos from the processing and handling of asbestos-contaminated ... emissions and contact with piles of vermiculite and waste rock, have been eliminated. In the past, workers or the community may have takenWeb
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Vermiculite of Hawaii received asbestos-contaminated vermiculite from the Libby mine and processed it by exfoliation. Commercial exfoliation of vermiculite is a process of heating it in a furnace to expand or "pop" it into lightweight nuggets. Vermiculite of Hawaii operated as a vermiculite exfoliation facility during 1954–1983. OtherWeb
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Asbestos Manufacturing in Davidson. From the 1930s to the 1960s, the Carolina Asbestos Corporation operated an asbestos manufacturing plant in Davidson, North Carolina. The plant made asbestos tiles, shingles and fabric. During the decades the plant operated, asbestos waste was dumped in a ditch on the property as well as in …Web
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In Minneapolis, Minnesota, a vermiculite processing plant operated from the 1930s until the late 1980s. The plant utilized vermiculite ore from Libby for much of those 50 to 60 years, meaning many of the plant's workers and nearby residents were at risk. ... contact a doctor immediately. Undergo testing to determine if your excessive coughing ...Web
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refers to a commercial process where vermiculite is heated until it expands into low-density, accordion-like nuggets. Exposure pathway The route a substance takes from its source to its end point and how people can come into contact with or get exposed to it. An exposure pathway has five parts: a source of contamination; an environmentalWeb
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Worked for vermiculite processing facility 2 56 0.9 Lived with a WM/WRG worker 84 1.3 Moved waste rock from WM/WRG 276 4.3 Used waste rock from WM/WRG 275 4.3 at home on the lawn or in the garden Played in or around waste rock piles at WM/WRG 655 10.2 Installed or removed vermiculite insulation 377 5.9Web
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This process is termed "exfoliation." As a result, expanded vermiculite consists of accordion-shaped granules that are lightweight and exhibit high porosity (Kipp et al., …Web
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The utility of the PVP–vermiculite nanocomposite materials can be found in area of wastewater cleaning as the remover of color from dye wastewater, since vermiculite is an excellent adsorbent for basic blue dye, requiring moderately short contact times. The phenols and iodine form a molecular complex with pyridine, as well as with PVP.Web
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Benign pleural effusions were identified among 12 workers in a vermiculite processing plant in Marysville, Ohio, which received most of its vermiculite from ... which was 51% among former mine workers, 23% among contacts of former workers, and 14% among other Libby residents . In another round of screenings conducted in 2003–2007 ...Web
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The vermiculite is used as an ingredient of refractory elements... Perlindustria Manufacturates Vermiculite for agriculture, construction and industry. +34 93 209 60 19 • info@perlindustriaWeb
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is a process flow diagram for vermiculite processing. Crude ore from open-pit mines is brought to the mill by truck and loaded onto outdoor stockpiles. Primary processing consists of screening the raw material to remove the waste rock greater than 1.6 centimeters (cm) (5/8 inch [in.]) and returning the raw ore to other stockpiles.Web
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activity-based modeled exposure estimates for vermiculite processing waste contact. We modeled associations between pleural abnormalities and asbestos exposure using multiple logistic regression to adjust for year of birth, , and potential occupational asbestos exposure. r. e s u l t s: Radiographs were obtained for 461 participants.Web
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In order to obtain expanded vermiculite products, the processing procedure of vermiculite involves six main steps: crushing, screening, magnetic separation, …Web
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The former W.R. Grace processing plant known as "Vermiculite Northwest" is located at the intersections of N. Harding, N. Randolph, and N. Loring in an industrial area near the Willamette River in northeast Portland, Oregon. Vermiculite was processed at the site from the early 1950's through 1993.Web
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