Vermiculite Health, Safety and Environmental Aspects
Vermiculite, in ore concentrate and exfoliated state, may contain small quantities of crystalline silica, as quartz. This is usually only present as non-respirable particles but
Vermiculite Ore Containing
Protect Your Family from Asbestos-Contaminated Vermiculite Insulation
The expanded vermiculite is a light-weight, fire-resistant, and odorless material and has been used in numerous products, including insulation for attics and walls. Sizes of vermiculite products range from very fine particles to large (coarse) pieces nearly an inch long. Concerns about Asbestos-contaminated Vermiculite Insulation
Exposure to asbestos-containing vermiculite ore and …
Exposure to asbestos-containing vermiculite ore and respiratory symptoms among individuals who were children while the mine was active in Libby, Montana Environ Health ... Libby, Montana, was home to the largest vermiculite ore mine in the United States. The processing, use, and transport of the ore, which was contaminated with amphibole ...
Frequently Asked Questions About Vermiculite
When vermiculite (Zonolite ore) is disturbed it can release billions of asbestos fibers into the air which increases the risk of lung cancer, mesothelioma, asbestosis and other asbestos related diseases. If the area containing the vermiculite is avoided and left undisturbed, then risk of exposure to asbestos fibers is decreased.
Hazardous Materials: EPA's Cleanup of Asbestos in Libby
Vermiculite ore--containing high concentrations of asbestos--was mined at Libby between 1923 and 1990, and accounted for most of the world's vermiculite. Mining, processing, or any disturbance of the contaminated vermiculite releases asbestos fibers into the air, which can lead to respiratory illnesses, including asbestosis.
BNSF potentially liable for asbestos | Western News
W.R. Grace acquired Zonolite in 1963 and operated the vermiculite mine until Sept. 1990. The Montana Supreme Court's ruling noted that the vermiculite "contained a significant amount of amphibole asbestos" and that ore processing "released dust containing fine asbestos fibers into the air." Ore concentrate was loaded on BNSF …
How vermiculite is made
Vermiculite ore deposits may also contain a variety of other materials such as mica, quartz, and feldspar. These deposits vary from one mining location to another. During the …
Mineralogical Aspects of Expanded Vermiculite Ores
It is believed that about 70% of the deposits are not pure vermiculite, but rather mixed-layer mica-vermiculite structures containing vermiculite and biotite (phlogopite) in various proportions . Such a structure can be regular or irregular, but in any case it affects the properties of vermiculite ore, in particular expansion.
CCOHS: Vermiculite Insulation Containing Asbestos
Vermiculite is a silver-gold to gray-brown mineral that is flat and shiny (flakes) in its natural state. It's composition and the presence of trace minerals or other contaminants depends on where it is located. When vermiculite ore is heated to around 1000 degrees C, it pops (or puffs up) which creates pockets of air.
EPA/Asbestos/Vermiculite Fact Sheet
Vermiculite is the mineralogical name given to hydrated laminar magnesium-aluminum-iron silicate that resembles mica in appearance. All vermiculite …
Limiting Worker Exposures to Asbestos- Containing …
Vermiculite ore mined near Libby, Montana was contaminated with ... When working with asbestos, including asbestos-containing vermiculite, the goal at a minimum is to reduce asbestos exposure to below the OSHA 8-hour time-weighted average permissible exposure limit of 0.1 fiber/cm . To ensure this
Vermiculite mineral extraction method | open cast mining …
VERMICULITE: Vermiculite is a mineral ore that can contain asbestos as a harmful byproduct. It was first discovered in 1824 in the English county of Worcester, Massachusetts, but commercial mining did not begin until 1923. ... Rocks containing the rich vein of vermiculite are excavated from a vast open pit in the ground. The mud …
Frequently Asked Questions
1) What is vermiculite? Vermiculite is a naturally occurring mineral that expands when heated. Expanded vermiculite has unique and versatile characteristics; it is lightweight, provides energy savings when used as insulation, it is non-combustible, highly absorbent, pH neutral, inert, non-reactive to all but very strong acids and compressible.
Exposure to Asbestos-Containing Vermiculite Ore and …
Zonolite Mountain, a mountain containing high concentrations of vermiculite ore. The ore was mined beginning in the 1920s by the Zonolite Company and then later by W.R. Grace, which bought the mine in 1963. It is estimated that between 1924 and 1990, when the mine was closed, a total of 5.8 million tons of vermiculite ore was mined and dis
The Vermiculite Association
Vermiculite is the mineralogical name given to hydrated laminar magnesium-aluminium-iron silicates that resemble mica in appearance. All vermiculite ores contain a range of other …
Mineral resource of the month: vermiculite
Vermiculite comprises a group of hydrated, laminar magnesium-aluminum-iron silicate minerals resembling mica. They are secondary minerals, typically altered biotite, iron-rich phlogopite or other micas or clay-like minerals that are themselves sometimes alteration products of amphibole, chlorite, olivine and pyroxene. Vermiculite deposits are …
Vermiculite
Vermiculite has a talc-like structure in which some Fe 3 ... which allows for the use of this mineral as an amendment to treat soils containing heavy metals (Xu et al., 2017). Incorporating vermiculite into compost reduces nitrogen losses by reducing NH 3 emission (He et al., 2018). Vermiculite is an effective pool of key cations (e.g. Ca, K ...
Vermiculite: Structural Properties and Examples of the Use
2. Obtaining vermiculite small particles . Natural vermiculite flakes are characterized by high values of aspect ratio. In clay science, exfoliation involves a degree of separation of the layers of a host structure where units, either individual layers or stacking of several layers, are dispersed (freely oriented and independent) in a solvent or polymer …
Exposure to Asbestos-Containing Vermiculite Ore and …
The vermiculite ore contained amphibole asbestos. Libby amphibole asbestos was determined to be composed of tremolite, winchite, and richterite (Meeker et al. 2003).The International Agency for Research on Cancer recently concluded that "all forms of asbestos are 'carcinogenic to humans'" and that "mineral substances (e.g., talc …
What is Vermiculite? | Asbestos | US EPA
Vermiculite is the mineralogical name given to hydrated laminar magnesium-aluminum-iron silicate that resembles mica in appearance. All vermiculite ores contain …
What Is Vermiculite and How Is It Used?
Improving drainage: Vermiculite is added to improve the soil texture of heavy clay soil that is waterlogged because of poor drainage.; Improving water retention: Adding vermiculite also improves the soil texture of sandy soil that drains too fast and does not retain enough water.; Seed starting: Vermiculite as the sole material or in a potting mix …
W.R. Grace Offers $18.5M to Settle Montana …
Vermiculite ore containing asbestos on display at the Center for Asbestos Related Disease in Libby. ... Asbestos from a vermiculite mine owned by W.R. Grace beginning in 1963 polluted the …
Perlite vs Vermiculite vs Pumice vs Peat Moss. Explained!
Once vermiculite ore is mined, it is rapidly heated to extreme temperatures causing the hydrated silicate to expand and change texture from solid rock to a soft clay-like texture that is absorbent. Vermiculite in its exfoliated (expanded) state takes on properties similar to clay. ... Sphagnum moss is a genus containing roughly 380 species of ...
Mesothelioma associated with commercial use of vermiculite containing
Objectives: To describe asbestos-related mortality among manufacturing workers who expanded and processed Libby vermiculite that contained amphibole fiber. Methods: Standardized mortality ratio was calculated for 465 white male workers 31 years after last Libby vermiculite exposure. Results: Two workers died from mesothelioma, resulting in …
Mineral resource of the month: vermiculite
Vermiculite deposits are associated with volcanic ultramafic rocks rich in magnesium silicate minerals, and flakes of the mineral range in color from black to shades of brown …
Vermiculite : Properties, Uses, Deposits » Geology Science
Asbestos-containing vermiculite poses health risks, and it is crucial to determine the safety of the vermiculite source and handle it appropriately. The physical …
Zonolite Insulation
Zonolite insulation is a toxic vermiculite-containing product found in attics of millions of older American homes, posing a potential danger to residents. Skip to main content. Menu Open. Search. Mesothelioma. ... Vermiculite and asbestos have much in common: Both are resistant to fire and chemical corrosion, and both make excellent …
Vermiculite | Encyclopedia.com
l Rocks containing vermiculite are dug from a huge open pit in the ground. The soil on top of the rocks, called the overburden, is removed with power shovels or earth scrapers. The exposed rock layers are then drilled with large pneumatic or hydraulic drills, and the holes are filled with explosive charges. ... Vermiculite ore deposits may also ...
Exposure to Asbestos-Containing Vermiculite Ore and …
Libby is a small community located in the Kootenai River Valley of northwestern Montana approximately 6 miles southwest of Zonolite Mountain, a …
Transformation process from phlogopite to vermiculite …
At normal or low temperatures, phlogopite is transformed through phlogopite containing vermiculite crystal layer and phlogopite–vermiculite mixed-layer mineral, but pure vermiculite particles can be observed only from fine vermiculite particles. ... In the natural vermiculite ore, the content of Fe 3+ is higher than that of phlogopite ore ...
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