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silica
silica saturation
silica saturation The concentration of silica (SiO
2) in an
igneous rock, relative to the concentration of other chemical constituents in the rock which combine with the silica to form
silicate minerals. On this basis, three classes of igneous rock are recognized: (
a) silica-oversaturated rocks (e.g.
granite), in which there is more than enough silica to satisfy the requirements of all the major silicate minerals, the free silica appearing as
quartz in the rock; (
b) silica-saturated rocks (e.g.
diorite), in which there is just enough silica present to satisfy the requirements of all the major silicate minerals, there being neither an excess nor deficiency of silica, resulting in a lack of both quartz and feldspathoid minerals in the rock; and (
c) silica-undersaturated rocks (e.g.
nepheline syenite), in which there is not enough silica present to satisfy the requirements of all the major silicate minerals, the silica deficiency being accommodated by the crystallization of feldspathoids (
nepheline,
leucite) in place of
feldspar, the feldspathoids containing less silica in their structure than feldspars.
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Using silica to control bleed and segregation in self-compacting concrete
Magazine article from: Concrete; 2/1/2003; ; 700+ words
; ...silica' is synonymous with fillers, be they sands, pfa, silica fume (micosilica) or precipitated silica. Some fine silicas can also provide a degree of pozzolanic activity. Silica sols are, however, very different in that they react readily...
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Silica removal processes.
Magazine article from: National Driller; 4/1/2005; ; 700+ words
; ...treatment objective may include reducing silica concentration to permit increased cycles...effective to remove most (if not all) colloidal silica, this usually is a small fraction of the total silica in natural water supplies. Conventional...
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Silica gel is in urgent need of quality improvement.(Inorganics)
Magazine article from: China Chemical Reporter; 12/26/2008; ; 700+ words
; Silica gel is a silicon dioxide xerogel with a...dimension network structure and cellularity. Silica gel's unique characteristics of controllable...technology for the production of staple silica gel categories in China, mainly including...
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Silica Liability: READY TO EXPLODE
Magazine article from: Canadian Underwriter; 8/1/2004; ; 700+ words
; ...learn of a new threat coming down the pipe - silica liability. While crystalline silica has been a known industrial hazard since the...lawyers filing asbestos claims. As the number of silica deaths drops each year, why is the industry...
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Silica wet masterbatch: a new process for pre-dispersion of silica in emulsion polymers.
Magazine article from: Rubber World; 6/1/1998; ; 700+ words
; There is a growing interest in silica-reinforced rubber compounds. For example, silica use in tire compounds has grown five to ten percent...With the numerous advantages now realized by silica-based tire compounds, one might wonder about...
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Advanced silica gel products for gloss reduction and corrosion protection.
Magazine article from: Paint & Coatings Industry; 9/1/2005; ; 700+ words
; ...belong to a class of synthetic silica materials known as hydrated silicas, which have an average water...The physical properties of silica gel differ from other specialty silicas, The internal structure of silica gel is composed of a large...
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Silica to rise in US truck tyres as Europe gets mature.(Statistical Data Included)
Magazine article from: European Rubber Journal; 12/1/1999; ; 700+ words
; ...are seen as the next big market for silica to conquer -- as long as coupling agents...developed to provide interaction between silica and the natural rubber used in truck tyres. The next growth burst for silica will be in the US truck tyre market...
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Silica injury claims rattle insurers.
Newspaper article from: Knight Ridder/Tribune Business News; 7/15/2004; 700+ words
; ...insurers are sweating about another mineral that can heavily damage the lungs: silica. Silica is a mineral found in sand, granite, concrete, and other substances. The silica dust that can cause lung disease becomes airborne in mining, foundry work...
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Silica: Health & beauty from nature
Magazine article from: Better Nutrition; 12/1/1997; ; 700+ words
; ...where it is chiefly found in the form of silica or silicon dioxide (also called flint...inorganic sources, it occurs mainly as oxide silica in sand and quartz and as silicates in...can just refer to the dietary forms as "silica." A trace element, silica is critical...
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Silica: Natural beauty's best friend
Magazine article from: Better Nutrition; 5/1/2000; ; 700+ words
; ...THE BEST OF HEALTH. One such mineral, silica, or more properly silicon, is essential...blood vessels, skin and hair. While silica may not be the first beauty nutrient that...skin and nails depend upon it. In fact, silica not only enables your body's framework...
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Silica
Encyclopedia entry from: Gale Encyclopedia of Alternative Medicine
Silica Description Silica, sometimes called Silicea terra or abbreviated as sil., is a homeopathic remedy. Silica is a mineral and is prepared from silicon dioxide found in flint...
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silica saturation
Book article from: A Dictionary of Earth Sciences
silica saturation The concentration of silica (SiO 2 ) in an igneous rock, relative to the concentration of other chemical constituents in the rock which combine with the silica to form silicate minerals. On this basis, three classes of...
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pelagic silica
Book article from: The Oxford Companion to the Earth
pelagic silica Diatoms and radiolarians predominate in siliceous pelagic...which secrete a test (or frustule) of amorphous hydrated silica, also known as opal or opaline silica (SiO 2 · n H 2 O). Diatoms vary greatly in size...
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silica gel
Book article from: The Columbia Encyclopedia, Sixth Edition
silica gel chemical compound. It is a colloidal form of silica , and usually resembles coarse white sand. It may be...catalyst carrier, and in purifying various substances. Silica aerogel is fully dehydrated silica gel; it is very porous...
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silica
Book article from: The Columbia Encyclopedia, Sixth Edition
silica or silicon dioxide, chemical compound...soluble in dilute hydrofluoric acid. Pure silica is colorless to white. It occurs in several...stems and other tissue of higher plants. Silica has many important uses. It is used as...
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