Vermiculite
Vermiculite is a safe inert material and is light in colour. When heated it expands (exfoliates) up to 30 times its original volume. The exfoliation process converts the dense flakes of ore into lightweight porous granules containing innumerable minute air layers.
Vermiculite | Formula, Properties & Application
Explore the properties, types, and diverse applications of Vermiculite, a unique mineral, while addressing related safety concerns.
Summary Report
Vermiculite ore Vermiculite that has been removed from the ground (mined), but not yet cleaned and milled into a concentrated form. ... during their evaluations of 28 sites that received asbestos-containing . vermiculite from a mine in Libby, Montana. These 28 site evaluations : focused on potential past, current, and future pathways of ...
Workers Exposed To Libby Vermiculite Ore Have High …
More than one-quarter of tested workers at an Ohio manufacturing plant historically exposed to asbestos-containing vermiculite ore exhibited signs of scarring of the chest wall lining, or pleural ...
American Journal of Respiratory and Critical Care Medicine
Vermiculite from South Africa and South Carolina are minimally contaminated with asbestos, unlike vermiculite mined in Montana and Quebec. In these latter two areas, …
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 …
Resolving the Vermiculite Asbestos Conflict
Operators mined most of the vermiculite ore through large open cuts; several adits, one 750 feet long, also provided access to the ore. Initial processing took place at a ... >10% vermiculite containing, Item 198.6 may be used to evaluate the asbestos content of the material; provided, however, that any test results using this method must be ...
American Journal of Respiratory and Critical Care Medicine
This case analysis raises several concerns: risks of vermiculite induced disease among former workers of the more than 200 expansion plants throughout the United States; health effects of brief but very high-intensity exposures to asbestos; and possible health effects in end-users of consumer products containing vermiculite.
The Vermiculite Association Membership Application
Actively engaged in the mining of vermiculite ore and/or the production of vermiculite concentrate, or 3. A sales agent or broker of a person, firm, organization or corporation which qualifies as, but is not, a Mining Member ... Actively engaged in the manufacture of products containing vermiculite, or 3. A mining company that produces 10,000 ...
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.
Vermiculite Insulation Containing Asbestos Diseases, …
When vermiculite ore is heated to around 1000 degrees C, it pops (or puffs up) which creates pockets of air. This expanded form is light weight, fire resistant, ... What are the health risks of vermiculite containing asbestos? Asbestos can cause health problems when inhaled into the lungs. Breathing in very small,
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 ... Some countries will even require any material containing more than 0.1% crystalline silica to be labelled as a carcinogen. Information given in this booklet is only ...
α-Fe2O3 Nanoparticles/Iron-Containing Vermiculite …
Many researchers have focused on raw phyllosilicates as ideal materials for the immobilization of photocatalytic active nanoparticles to avoid potential environmental and health risks (e.g., [1,2]).Vermiculites play a great role as the layered carrier in the synthesis of photocatalysts with high performance.
Analytical Method for the Determination of Asbestos in Vermiculite …
Dry the exfoliated product either on a hotplate or in an oven. 8.3.6 Soil Samples Containing Crude Vermiculite Ore Soil samples containing crude (unexfoliated) vermiculite ore probably also contain organic constituents which need to be removed prior to analysis. Exfoliation in a muffle furnace is the optimum approach, because in one operation ...
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.
Membership Application
2. actively engaged in the mining of vermiculite ore and/or the production of vermiculite concentrate, or. 3. a sales agent or broker of a person, firm, organization or corporation which qualifies as, but is not, a ... 2. actively engaged in the manufacture of products containing vermiculite, or. 3. a mining company that produces 10,000 tonnes ...
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 and yellow. …
Health Statistics Review of Asbestos-Related Diseases in …
ATSDR issued cooperative agreements to select state public health agencies to conduct health statistics reviews related to potential human exposure to contaminated vermiculite ore (an asbestos-containing mineral) at sites across the United States.
US4780147A
the patent discloses that the dispersions can be prepared by treating vermiculite crystal with a solution containing a cation which can diffuse between the interlayers of the crystal's mineral structure and cause gross swelling in a direction normal to the main cleavage plane of the layer during immersion in water, immersing the treated vermiculite in water and permitting the …
Western Mineral Products Vermiculite Processing …
Vermiculite ore containing hazardous Libby asbestos was processed in Northeast Minneapolis from 1938-1989. This page contains information about the vermiculite, ways people were exposed, potential health impacts, and …
Vermiculite 101: Everything You Need to Know (Best Tips)
Expert Tips for Gardening with Vermiculite A. Handling and Usage in Gardening. Proper Handling: When using vermiculite for gardening, it's crucial to wear protective gear such as gloves, masks, and goggles to avoid inhalation and direct skin contact, ensuring safety during application.; Optimal Environment: To minimize health risks, work with vermiculite in well …
The Vermiculite Association Membership Application
2.Actively engaged in the mining of vermiculite ore and/or the production of vermiculite concentrate, or 3.A sales agent or broker of a person, firm, organization or corporation which qualifies as, but is not, a Mining Member ... 2.Actively engaged in the manufacture of products containing vermiculite, or 3.A mining company that produces 10,000 ...
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 associated with volcanic ultramafic …
What is Vermiculite?
Vermiculite is the mineralogical name given to hydrated laminar magnesium-aluminum-iron silicate that resembles mica in appearance. All vermiculite ores contain a range of other minerals that were formed along with the vermiculite in the rock.
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 matrix [].
ATSDR Asbestos Work | Asbestos | ATSDR
Select mortality and cancer incidence among residents in various U.S. communities that received asbestos-contaminated vermiculite ore from Libby, Montana; Libby vermiculite exposure and risk of developing asbestos-related lung and pleural diseases; Exposure to asbestos-containing vermiculite ore and respiratory symptoms among individuals who ...
BNSF potentially liable for asbestos
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 railcars.
VERMICULITE Indian Minerals Yearbook 2020
per year (t/yr) of vermiculite ore with estimated reserves of 1.2 million tonnes (Mt) of vermiculite ore. With expansion of its mining operations continuing, Brasil Minerios produced about 51,600 tonnes of vermiculite concentrate in 2017. Bulgaria In 2016, Wolf f & Muller Minerals Bulgaria OOD, a German-Bulgarian joint-venture company, mined
12/09/2013 New York State Departmen
• Sprayed vermiculite-containing fireproofing applied after 1973 contained no added asbestos • Analysis of bulk samples by electron microscopy found asbestos fibers were less than one percent of the total mass after ore beneficiation. The vermiculite industry has been concerned
Current Research and Opportunities to Address …
Exposure to asbestos-containing vermiculite ore and respiratory symptoms among individuals who were children while the mine was active in Libby, Montana. Environ Health Perspect 118:1033-1038 https://pubmed.ncbi.nlm.nih.gov/20332072/ .