Vermiculite Ore Containing
Home > Products > Vermiculite Ore Containing

Vermiculite Ore Containing

What is Vermiculite? | Asbestos | US EPA

All vermiculite ores contain a range of other minerals that were formed along with the vermiculite in the rock. Vermiculite ores from some sources have been found to contain asbestos minerals but asbestos is not intrinsic to vermiculite and only a few ore bodies have been found to contain more than tiny trace amounts.

Read More

EPA/Asbestos/Vermiculite Fact Sheet

Vermiculite ores often contain a range of other minerals including, in some cases, asbestos. Asbestos is not a major contaminant, and only a few ore deposits have been found to contain more than trace amounts of asbestos minerals. However, exposure to airborne asbestos particles has been linked to respiratory ailments in-

Read More

Vermiculite - Wikipedia

Vermiculite is a hydrous phyllosilicate mineral which undergoes significant expansion when heated. Exfoliation occurs when the mineral is heated sufficiently, and commercial furnaces can routinely produce this effect. Vermiculite forms by the weathering or hydrothermal alteration of biotite or phlogopite. Large commercial vermiculite mines currently exist in the United States of America, Russia, South Africa, China, and Brazil.

Read More

Expanded vermiculite ores examined in this study

Feb 13, 2019 · Table 1. Expanded vermiculite ores examined in this study: their sources and amphibole, talc, and/or serpentine impurities. Notes: XRD = X-ray diffraction analysis of bulk ore samples (B) and sink fractions (S). SEM-EDS = Scanning Electron Microscope – Energy-Dispersive X-Ray Spectroscopy. Band Depth Ratio = 1.40/1.42-µm band depth ratio.

Read More

EPA/Asbestos/Vermiculite Fact Sheet

Vermiculite ores often contain a range of other minerals including, in some cases, asbestos. Asbestos is not a major contaminant, and only a few ore deposits have been found to contain more than trace amounts of asbestos minerals. However, exposure to airborne asbestos particles has been linked to respiratory ailments in-

Read More

Hazardous Substance Tools: What about vermiculite?

Vermiculite is a mineral ore that has been expanded to produce the familiar light granules that are sometimes used as loose fill insulation. Only a few vermiculite ores contain asbestos. However, between 1960 and 1990, 70 percent of the world’s vermiculite ore came from a mine in Libby, MT, and was marketed as Zonolite.

Read More

How vermiculite is made - material, history, used ...

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 manufacturing process, some of these materials may pose potential health hazards to workers.

Read More

Expanded vermiculite ores examined in this study

Table 1. Expanded vermiculite ores examined in this study: their sources and amphibole, talc, and/or serpentine impurities. Notes: XRD = X-ray diffraction analysis of bulk ore samples (B) and sink fractions (S). SEM-EDS = Scanning Electron Microscope – Energy-Dispersive X-Ray Spectroscopy. Band Depth Ratio = 1.40/1.42-µm band depth ratio.

Read More

Golden Vermiculite Ore – VISIGHT

GOLDEN VERMICULITE ORE. Vermiculite is a mineral that contains magnesium and degenerates from hydrated aluminium silicates. This product appears as brown crystalline powder/flakes. It can be used in coatings and refractory materials. Vermiculite ore process heat-resistant, inert, inorganic, lightweight and absorbent, making it an excellent ...

Read More

Vermiculite: Uses for growing plants, safety, and ...

Sep 12, 2019 · A typical chemical analysis of commercial vermiculite shows it contains 38-46% silicon oxide (SiO2), 16-35% magnesium oxide (MgO), 10-16% aluminum oxide (Al2O3), 8-16% water, plus lesser amounts of several other chemicals. After mining, the ore is separated from other minerals and screened to classify it into different particle sizes.

Read More

The Danger in Your Garden - Asbestos Contaminated Vermiculite

Jul 08, 2020 · Vermiculite, a naturally occurring mineral was, until 1990, mined from the same ore deposits as the deadly mineral fiber asbestos. Asbestos ore is made up of long, thin fibers that can only be seen through a microscope.

Read More

Vermiculite – Aerospring Gardens

Vermiculite is derived from 19 varieties of micaceous minerals and the ores contain silica, alumina, iron oxides and magnesium oxide. The expanding properties upon heating were observed by Thomas Webb in 1824, who heated ore over a candle and watched it turn into elongate forms that resembled worms.

Read More

Photographs of commercial, expanded vermiculite ore.

The goal of this study was to determine if in situ near-infrared reflectance measurements could be used to reliably identify the source of vermiculite ore and therefore its potential to contain asbestos. Spectra of 52 expanded ore samples, including attic insulation, commercial packing materials, and horticultural products from Libby, Montana ...

Read More

Western Mineral Products: Vermiculite Processing ...

Mar 13, 2019 · Vermiculite Processing Operations in Northeast Minneapolis. 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 publications and resources.

Read More

Asbestos - Vermiculite - EH: Minnesota Department of Health

Mar 07, 2019 · A member of the phyllosilicate group of minerals, it resembles mica in appearance. In its pure form, vermiculite is clean, odorless, nontoxic and sterile. Recent findings about vermiculite ore contaminated with tremolite asbestos have caused concern over possible health effects for workers and others who had long-term contact.

Read More

Schundler Company Vermiculite Technical Information--EPA News

"Vermiculite ores from some sources have been found to contain asbestos minerals, but asbestos is not intrinsic to vermiculite and only a few ore bodies have been found to contain more than tiny trace amounts." (See EPA:Vermiculite). To be sure, asbestos is not a major contaminant in vermiculite

Read More

Vermiculite – Aerospring Gardens

Vermiculite is derived from 19 varieties of micaceous minerals and the ores contain silica, alumina, iron oxides and magnesium oxide. The expanding properties upon heating were observed by Thomas Webb in 1824, who heated ore over a candle and watched it turn into elongate forms that resembled worms.

Read More

Vermiculite mineral extraction method–open cast mining ...

Vermiculite is a mineral ore that can include asbestos as a harmful waste. It was first found in the year 1824 in the English county of Worchester, Massachusetts but was

Read More

US5079280A - Low temperature expandable vermiculite and ...

A method of decreasing the expansion temperature and improving the expansion characteristics of vermiculite ore comprising subjecting vermiculite ore containing interlamellar cations to a potassium nitrate solution for a time interval sufficient to ion-exchange interlamellar cations within said ore with potassium ions. Subsequent to this ion exchange the low temperature expandable vermiculite ...

Read More

for Vermiculite from Libby, Montana Analysis of ...

the ability to find asbestos if present in vermiculite ores and products. This article contains information on most of the available methods for vermiculite analy-sis based on an extensive review of published articles, government reports and other documents. The lim

Read More

A risk assessment for exposure to grunerite asbestos ...

Vermiculite Ore Containing Tremolite Asbestos. The mineral vermiculite has the generalized chemical formula (Mg, Ca) 0.35 (Mg, Fe, Al) 3 (Al, Si) 4 O 10 (OH) 2 nH 2 O. On heating, the mineral loses water rapidly and expands to form a lightweight aggregate used for various purposes, e.g., insulation, soil conditioning, and filter medium.

Read More

Why is vermiculite attic insulation a problem for both ...

Jul 09, 2018 · There were veins of asbestos in the mined ore that ended up in the final product, and it is estimated that between 3 million and 30 million homes have vermiculite insulation in the attic. Peak period of production was the 1950s through the 1970s, and the estimate of homes affected varies so widely because it was primarily sold for homeowner ...

Read More

Vermiculite: A Review of the Mineralogy and Health Effects ...

Vermiculite ores may contain a variety of other minerals including asbestos, which, if present in significant quantities, could pose a health risk to producers and end users. A variety of regulations are in place that should prevent inadvertent exposure to asbestos in vermiculites, but great care is needed if true asbestos hazards are to be ...

Read More

Schundler Company Vermiculite Technical Information ...

Further studies were done with scanning electron microscopy (SEM) of the crude, unexpanded vermiculite. The conclusion: "The results of our analysis program confirm that the sample of crude vermiculite ore provided by American Vermiculite Corporation is composed of high grade vermiculite containing only minor traces of impurities.

Read More

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

Read More

STRATEGY FOR FURTHER ASSESSMENT OF VERMICULITE

Strategy for Further Assessment of Vermiculite Ore Asbestos Sites September 30, 2008 I. Background : The Agency is committed to developing a strategy by the end of FY08 for conducting further assessments of vermiculite ore asbestos sites: "We agree it would be prudent to take another look at the completed site assessments

Read More