Vermiculite ore deposits, like most other rocks, contain an assemblage of other minerals besides the vermiculite (Addison and Davies 1990). There may be major components such as feldspars, pyroxenes, amphiboles, carbonates, and quartz, as well as minor components such as phosphates, iron oxides, titanium oxides and zircon (Atkinson et al 1982).

Resources | Free Full-Text | Decreasing Ore Grades in

Mining industry requires high amounts of energy to extract and process resources, including a variety of concentration and refining processes. Using energy consumption information, different sustainability issues can be addressed, such as the relationship with ore grade over the years, energy variations in electricity or fossil fuel use. A rigorous analysis and understanding of the energy ...

Limiting Potential Exposures of Workers to Asbestos | NIOSH | CDC

Vermiculite ore mined near Libby, Montana, which accounted for more than half the worldwide production of vermiculite from 1925 to 1990, was contaminated with asbestos and asbestos-like fibers. Workplace exposure to these fibers caused a serious health problem in local miners and millers, as well as some downstream workers.

Community Exposure to Asbestos From a Vermiculite

Actual concentrations in the ore shipped to the various expansion plants across the country were probably lower due to the processing of the ore in Libby prior to shipment, ranging from<1%to 7% in the vari- ousgradesofore(U.S.EPA,2000).Theorewasusuallyshipped by rail. 941 942J. KELLY ET AL.

PDF 11.28 Vermiculite Processing -

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 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.


vermiculite ore shipped from the Libby mine. The non-exfoliation sites also had fewer material handling and processing steps (e.g., receiving shipments as bagged product vs. in bulk via railcar). o For instance, at gypsum wallboard manufacturing facilities (the largest grouping of non-exfoliation sites), the vermiculite ore was commonly

5 Things You Need to Know About Vermiculite | Family Handyman

Jun 17, 2019 · What is vermiculite? Vermiculite is a mineral that was used for insulation. If your home was built before 1990, you might have vermiculite insulation in your walls or attic. Up to 85 percent of all vermiculite insulation in the U.S. came from a mine in Libby, Montana, sold under the name Zonolite.

EPA/Asbestos/Vermiculite Fact Sheet

Vermiculite is produced from ore mined throughout the world. In the United States, mines are located in Montana, South Carolina, and Virginia. When heated, the ore expands into a light, rather fluffy material, that is fire resistant, chemically inert, absorbent, light weight, and …

Protect Your Family from Asbestos-Contaminated Vermiculite

Sizes of vermiculite products range from very fine particles to large (coarse) pieces nearly an inch long. Top of Page. Concerns about Asbestos-contaminated Vermiculite Insulation. A mine near Libby, Montana, was the source of over 70 percent of all vermiculite sold in …

Vermiculite Building Insulation & Asbestos Hazards

An IMC official said Koos purchased vermiculite ore from American Vermiculite (a South African mine) and from W.R. Grace, but, to their knowledge, none of the ore came from the Libby mine. The ore was shipped to the facility by truck and rail and the exfoliation process was performed indoors. EPA did not see any evidence of vermiculite on the site.