Vermiculite


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Related to Vermiculite: Vermiculite Concrete

vermiculite

[vər′mik·yə‚līt]
(mineralogy)
(Mg,Fe,Al)3(Al,Si)4O10(OH)2·4H2O A clay mineral constituent similar to chlorite and montmorillonite, and consisting of trioctahedral mica sheets separated by double water layers; sometimes used as a textural material in painting, or as an aggregate in certain plaster formulations used in sculpture.

Vermiculite

A generic name for treated minerals which are used for insulation and fire protection, often as an aggregate in plaster or concrete.

Vermiculite

 

a mineral of the hydromica group with a schistous structure and additional interlaminate molecular water. Upon heating, small vermiform rods are formed from the layers of vermiculite. Chemical composition corresponds approximately to the formula Mgx(Mg, Fe)3 x[AlSi3 O10] · (OH)2 · 4H2O. It crystallizes in a monoclinic system and forms laminated aggregates or large laminated crystals of a golden yellow or brown color. Hardness on the mineralogical scale, 1-1.5; density, 2400-2700 kg/m3. It is not susceptible to pulverization and is similar to graphite in lubricating qualities.

When heated to a temperature of 900-1000° C, vermiculite swells (as a result of flaking of particles under the influence of evaporating interlaminate water), with an increase in volume of 15-20 times. Interlayers of air arising between the scaly layers of the mineral cause low density and high heat-and sound-insulating properties of exfoliated vermiculite. Vermiculite is a product of secondary change in dark micas (biotite and phlogopite). Commercial deposits of vermiculite in the USSR are known on the Kola Peninsula (Murmansk Oblast) and in the Urals (Cheliabinsk Oblast); and abroad, in the USA (Montana, Colorado, Wyoming, North Carolina, and Georgia) and in western Australia. Vermiculite is used in construction for the manufacture of heat-insulating products, sound-absorbing materials, lightweight concrete, and plastering solutions; as a filler in rubber, plastic, paints, chemical pesticides; in the manufacture of antifriction materials; and in agriculture, to improve soil structure.

vermiculite

A natural mica expanded by heat(i.e., exfoliated) to form lightweight thermal insulating
References in periodicals archive ?
Global Vermiculite Mining Market Report 2019 from the publisher provides the strategists, marketers and senior management with the critical information they need to assess the global vermiculite mining market.
Treatments Determinations T1 * T2 T3 T4 T5 pH [H.sub.2]O] 5.84 6.73 5.51 5.72 5.29 EC mS [cm.sup.-1] 0.12 0.08 0.81 0.19 0.16 Dw kg [m.sup.-3] 473.60 216.97 304.83 132.17 580.60 Dd kg [m.sup.-3] 162.03 139.56 153.74 69.75 465.22 TP % 93.12 85.42 88.35 83.55 54.92 AFP % 39.79 62.50 35.32 44.78 12.76 EAW % 8.83 12.52 20.42 12.34 10.15 BW % 2.42 0.84 3.27 1.13 1.57 RW % 42.08 9.56 29.33 25.30 30.44 * T1--vermiculite, T2--carbonized rice husk (CRH), T3--commercial (peat + vermiculite + CRH), T4--coconut fiber (CF), and T5 - composted Pinus bark (CPB).
The higher survival percentage of cuttings was obtained in the vermiculite substrate with the cv.
Montmorillonite and vermiculite are used as effective sorbents for removing toxic ions [14-18], toxic molecules from waste water [19-21], dyes [22-25], or other compounds [26, 27].
Five grams of milled vermiculite samples (Ver-B and Ver-SL) were mixed with 250 ml of 0.5 or 1 M HC1 solutions.
had vermiculite from the Grace mine used in them as insulation.
These changes are the result of the close collaboration of government officials, the world's most respected scientists in the area of vermiculite and members of our industry.
In this context, the present study assessed the composition, distribution and chemical state of the modifying species in vermiculite pillared with Al-M solutions, where M corresponds to an acidic metal (M= zirconium - Zr, cerium -Ce, and hafnium -Hf) added to the aluminum pillaring solution.
We're wondering if the inspector didn't want to go into the attic due to the vermiculite. Or he was just too lazy.
Hydroxy-interlayered vermiculite has been commonly identified in soils (Toksoy-Koksal et al.