wollastonite


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Related to wollastonite: tremolite
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Words related to wollastonite

a white or greyish mineral typically found in metamorphic limestone

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Of all the mines of the Middle-Lower Yangtze Metallogenic Belt, it is the Fengjiashan wollastonite mine (also known as the Daye copper mine) which has become most significant to mineral collectors during the past ten years.
In the Balti TPP secondary Ca-silicates are represented mainly by [beta]-C2S (belite), merwinite and wollastonite; while in the Eesti TPP also C3S, rankinite, as well as C4AF and akermanite are found.
In HDPE filled with talc or wollastonite, which were established to be stable samples in our previous work (9), no obvious oxidation was measured from the surface to the center at any stage throughout the duration of the test period.
NYCO, a pioneer in the production and use of fine-diameter, high-aspect-ratio wollastonite reinforcement, offers a new-generation product, Nyglos 4W, which has been shown to enhance the performance of vertical automotive body panels made with engineering alloys and liquid crystal polymers.
Mexico's Mineral Production Precious metals (kg) 1995 1996 Gold 19,944 24,083 Silver 2,495,388 2,536,000 Base metals (tonnes) Antimony 1,783 983 Arsenic 3,619 2,942 Bismuth 994 1,070 Cadmium 1,760 1,813 Copper 339,213 327,978 Lead 179,740 167,114 Molybdenum 3,881 4,211 Tin 0 2 Tungsten 286 188 Zinc 354,565 348,328 Ferrous metals and coal (tonnes) Coal 7,347,479 8,780,000 Coke 2,147,603 2,184,000 Iron 5,547,823 6,109,000 Manganese 141,184 173,000 Industrial minerals (formes) Barite 149,740 470,000 Celestite 138,342 141,000 Dolomite 931,770 930,000 Feldspar 121,779 140,000 Fluorite 522,655 524,000 Graphite 33,898 40,000 Gypsum 3,477,840 3,759,000 Kaolin 6,823 14,000 Phosphate 620,259 682,000 Salt 7,669,000 8,508,000 Silica 1,292,264 1,425,000 Sulfur 871,380 921,000 Wollastonite 0 2,584
Other surface-modified inorganic extenders, pigments, and fillers are Trikup (alumina trihydrate), Monykup (antimony oxide), Titankup (titanium dioxide), Wollastokup (wollastonite), Carbokup (calcium carbonate), Silikup (silica), and Klakup (aluminum silicate).
The associate species for the modeling of the liquid phase include CaSi[O.sub.3] (wollastonite) which is stable between 298 to 1398 K, CaSi[O.sub.3] (pseudowollastonite) which is stable at 1398 to 1817 K, [Ca.sub.2]Si[O.sub.4] (calcium othosilicate), [Ca.sub.3]Si[O.sub.5] which is stable in the temperature range from 1523 to 2343 K and Ca3Si2O7 (rankinite) which is stable up to 1737 K [17].
Commonly used mineral fillers for isotactic polypropylene (iPP) include talc, calcium carbonate, glass fibers, and wollastonite. Because of its acicular crystal habit and a relatively high-level hardness, wollastonite (CaSi[O.sub.3]--calcium metasilicate) contributes to the iPP composites reinforcing properties [2-4].
Table 1--effect of mineral filler type on durability of silane finish Acidic fillers Neutral fillers [Fe.sub.2][O.sub.3] 100 Ti[O.sub.2] 84 Zr[O.sub.2] 78 [Al.sub.2]Si[O.sub.5] 87 Clay 66 Kaolin 96 Sn[O.sub.2] 77 ZnO 100 Alkaline fillers Ca[(OH).sub.2] 57 MgO 98 E-Glass 50 Wollastonite 21 CaC[O.sub.3] 19 Mica 55 Table 2--performance of silane coupling agents in a silica-filled polyester composite Flexural strength, Mpa Additive (0.3%) Viscosity based on filler of mix, cp.
In the present work, biocomposites containing bioglass ceramic Apatite Wollastonite (AW) and Polymethamethacrylate (PMMA) were processed successfully using PIM.
In the front fascia, the material is reinforced with mica by means of a Bayer-patented technology, while the rear fascia, rocker panels, rear bumper cover, and the spoiler are reinforced with wollastonite. These mineral fillers are added directly to the polyol blend to produce the RRIM parts.
These garnets are associated with a mineral of the wollastonite group, as masses of white fibers (the crystals were enclosed in these soft, fibrous masses, and thus were protected from damage during blasting and collecting).
Recoverable reserves of selected Indian resources (Mt unless otherwise stated) Fuel minerals Reserve Coal 192,000 Lignite 6,473 Metallic minerals Chromite 88 Iron ore (hematile) 9,602 (magnetite) 3,143 Manganese ore 176 Bauxite 2,525 Copper ore 416 Gold ore 18 Lead-zinc ore 186 Titanium 102 Tungsten 26 Vanadium 13 Molybdenum (t) 5,389 Non-metallic minerals Apatite 13 Asbestos 23 Barytes 70 China clay 986 Diamond ('000 ct) 1,084 Dolomite 4,967 Gypsum 239 Kyanite 3 Limestone 76,446 Magnesite 233 Mica (t) 109,000 Rock phosphate 147 Beach sand sillimanite 51 Soapstone/steatite 84 Wollastonite 4 Source: Indian Bureau of Mines The world does not stand still
Apart from commonly used fillers (talc, calcium carbonate, glass fibers), wollastonite (CaSi[O.sub.3]--calcium metasilicate) is often used as a reinforcing filler for iPP [2-4].
From minerals occurring in the ash samples taken from the ash fields of power plants the following compounds are present in minor amounts: gypsum CaS[O.sub.4].2[H.sub.2]O, ettringite [Ca.sub.6] [Al.sub.2](S[O.sub.4])3[(OH).sub.12] * 26[H.sub.2]O, magnesite MgC[O.sub.3], dolomite CaMg[(C[O.sub.3]).sub.2], rutile Ti[O.sub.2], monocalcium silicate CaSi[O.sub.3]/CaO?Si[O.sub.2] (wollastonite), dicalcium ferrite [Ca.sub.2] [Fe.sub.2] [O.sub.5]/2CaO * [Fe.sub.2][O.sub.3] (srebrodolskite), monocalcium aluminate Ca[Al.sub.2][O.sub.4]/CaO * [Al.sub.2][O.sub.3], tricalcium aluminate [Ca.sub.3][Al.sub.2] [O.sub.6] /3CaO * [Al.sub.2][O.sub.3], clinoenstatite MgSi[O.sub.3], and bredigite [Ca.sub.14][Mg.sub.2](Si[O.sub.4])8.