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Calcium silicate is the chemical compound Ca2SiO4, also known as calcium orthosilicate and is sometimes formulated as 2CaO·SiO2. It is also referred to by the shortened trade name Cal-Sil or Calsil. It occurs naturally as the mineral larnite.
Calcium silicate is used as an anticaking agent in food preparation, including table salt[6] and as an antacid. It is approved by the United Nations' FAO and WHO bodies as a safe food additive in a large variety of products.[7] It has the E number reference E552.
Calcium silicate is commonly used as a safe alternative to asbestos for high-temperature insulation materials. Industrial-grade piping and equipment insulation is often fabricated from calcium silicate. Its fabrication is a routine part of the curriculum for insulation apprentices. Calcium silicate competes in these realms against rockwool and proprietary insulation solids, such as perlite mixture and vermiculite bonded with sodium silicate. Although it is popularly considered an asbestos substitute, early uses of calcium silicate for insulation still made use of asbestos fibers.
It is used in passive fire protection and fireproofing as calcium silicate brick or in roof tiles. It is one of the most successful materials in fireproofing in Europe because of regulations and fire safety guidelines for commercial and residential building codes. Where North Americans use spray fireproofing plasters, Europeans are more likely to use cladding made of calcium silicate.[why?] High-performance calcium-silicate boards retain their excellent dimensional stability even in damp and humid conditions and can be installed at an early stage in the construction program, before wet trades are completed and the building is weather-tight. For sub-standard products, silicone-treated sheets are available to fabricators to mitigate potential harm from high humidity or general presence of water. Fabricators and installers of calcium silicate in passive fire protection often also install firestops.[citation needed]
While the best possible reaction to fire classifications are A1 (construction applications) and A1Fl (flooring applications) respectively, both of which mean "non-combustible" according to EN 13501-1: 2007, as classified by a notified laboratory in Europe, some calcium-silicate boards only come with fire classification of A2 (limited combustibility) or even lower classifications (or no classification), if they are tested at all.[citation needed]
Acid mine drainage remediation
Calcium silicate, also known as slag, is produced when molten iron is made from iron ore, silicon dioxide and calcium carbonate in a blast furnace. When this material is processed into a highly refined, re-purposed calcium silicate aggregate, it is used in the remediation of acid mine drainage (AMD) on active and passive mine sites.[8] Calcium silicate neutralizes active acidity in AMD systems by removing free hydrogen ions from the bulk solution, thereby increasing pH. As its silicate anion captures H+ ions (raising the pH), it forms monosilicic acid (H4SiO4), a neutral solute. Monosilicic acid remains in the bulk solution to play other important roles in correcting the adverse effects of acidic conditions. As opposed to limestone (a popular remediation material),[9] calcium silicate effectively precipitates heavy metals and does not armor over, prolonging its effectiveness in AMD systems.[8][10]
As a product of sealants
It is used as a sealant in roads or on the shells of fresh eggs: when sodium silicate is applied as a sealant to cured concrete or egg shells, it chemically reacts with calcium hydroxide or calcium carbonate to form calcium silicate hydrate, sealing micropores with a relatively impermeable material.[11][12]
Calcium silicate is often used in agriculture as a plant available source of silicon. It is "applied extensively to Everglades mucks and associated sands planted to sugarcane and rice" [14]
See also
Wikimedia Commons has media related to Calcium silicate.
^ . Archived from the original on June 5, 2012. Retrieved July 28, 2013. Codex General Standard for Food Additives (GSFA) Online Database, FAO/WHO Food Standards Codex alimentarius, published by the Food and Agricultural Organization of the United Nations / World Health Organization, 2013.
^ abZiemkiewicz, Paul. . Wvmdtaskforce.com. Archived from the original on 20 July 2011. Retrieved 25 April 2011.
^Skousen, Jeff. . Overview of Acid Mine Drainage Treatment with Chemicals. West Virginia University Extension Service. Archived from the original on 24 May 2011. Retrieved 29 March 2011.
^Hammarstrom, Jane M.; Philip L. Sibrell; Harvey E. Belkin. (PDF). Applied Geochemistry (18): 1710–1714. Archived from the original (PDF) on 5 June 2013. Retrieved 30 March 2011.
^Giannaros, P.; Kanellopoulos, A.; Al-Tabbaa, A. (2016). "Sealing of cracks in cement using microencapsulated sodium silicate". Smart Materials and Structures. 25 (8): 8. Bibcode:2016SMaS...25h4005G. doi:10.1088/0964-1726/25/8/084005.
^Passmore, S. M. (1975). "Preserving eggs". Nutrition & Food Science. 75 (4): 2–4. doi:10.1108/eb058634.
^Gascho, Gary J. (2001). "Chapter 12 Silicon sources for agriculture". Studies in Plant Science. 8 (8): 197–207. doi:10.1016/S0928-3420(01)80016-1. ISBN9780444502629.
January 20, 2023
calcium, silicate, metasilicate, calcium, metasilicate, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspa. For the metasilicate see Calcium metasilicate This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Calcium silicate news newspapers books scholar JSTOR July 2017 Learn how and when to remove this template message Micro cell redirects here For the battery type see Micro cell Calcium silicate is the chemical compound Ca2SiO4 also known as calcium orthosilicate and is sometimes formulated as 2CaO SiO2 It is also referred to by the shortened trade name Cal Sil or Calsil It occurs naturally as the mineral larnite Calcium silicate NamesPreferred IUPAC name Calcium silicateSystematic IUPAC name Dicalcium silicateOther names BeliteCalcium monosilicate Calcium hydrosilicate Calcium metasilicate Calcium orthosilicate Micro cell Silene Silicic acid calcium saltIdentifiersCAS Number 1344 95 2 Y111811 33 7 hydrate Y12168 85 3 calcium oxide Y3D model JSmol Interactive imageChEBI CHEBI 190294ChemSpider 14235 N23811 calcium oxide YECHA InfoCard 100 014 282EC Number 235 336 9E number E552 acidity regulators KEGG D03309 NMeSH Calcium silicatePubChem CID 1494144154858 hydrate25523 calcium oxideUNII S4255P4G5M Y404G39282C calcium oxide YCompTox Dashboard EPA DTXSID5049570InChI InChI 1S 2Ca O4Si c 1 5 2 3 4 q2 2 4 NKey JHLNERQLKQQLRZ UHFFFAOYSA N NSMILES Ca Ca O Si O O O PropertiesChemical formula Ca 2O 4SiMolar mass 172 237 g mol 1Appearance White crystalsDensity 2 9 g cm3 solid 1 Melting point 2 130 2 C 3 870 F 2 400 K Solubility in water 0 01 20 C 1 ThermochemistryStd molarentropy S 298 84 J mol K 3 Std enthalpy offormation DfH 298 1630 kJ mol 3 PharmacologyATC code A02AC02 WHO HazardsOccupational safety and health OHS OSH Main hazards IrritantNFPA 704 fire diamond 200Flash point Not applicableNIOSH US health exposure limits PEL Permissible TWA 15 mg m3 total TWA 5 mg m3 resp 1 REL Recommended TWA 10 mg m3 total TWA 5 mg m3 resp 1 IDLH Immediate danger N D 1 Safety data sheet SDS 4 Except where otherwise noted data are given for materials in their standard state at 25 C 77 F 100 kPa N verify what is Y N Infobox references Contents 1 Properties 2 Use 2 1 High temperature insulation 2 2 Passive fire protection 2 3 Acid mine drainage remediation 2 4 As a product of sealants 2 5 As a component of cement 2 6 Agriculture 3 See also 4 ReferencesProperties EditCalcium silicate is a white free flowing powder It can be derived from naturally occurring limestone and diatomaceous earth a siliceous sedimentary rock citation needed It is one of a group of compounds that can be produced by reacting calcium oxide and silica in various ratios 5 e g 3CaO SiO2 alite Ca3SiO5 2CaO SiO2 Ca2SiO4 3CaO 2SiO2 Ca3SiO7 and CaO SiO2 wollastonite CaSiO3 It has a low bulk density and high physical water absorption citation needed Use EditCalcium silicate is used as an anticaking agent in food preparation including table salt 6 and as an antacid It is approved by the United Nations FAO and WHO bodies as a safe food additive in a large variety of products 7 It has the E number reference E552 High temperature insulation Edit Calcium silicate passive fire protection board being clad around steel structure in order to achieve a fire resistance rating Calcium silicate is commonly used as a safe alternative to asbestos for high temperature insulation materials Industrial grade piping and equipment insulation is often fabricated from calcium silicate Its fabrication is a routine part of the curriculum for insulation apprentices Calcium silicate competes in these realms against rockwool and proprietary insulation solids such as perlite mixture and vermiculite bonded with sodium silicate Although it is popularly considered an asbestos substitute early uses of calcium silicate for insulation still made use of asbestos fibers Passive fire protection Edit Circuit integrity fireproofing of cable trays in Lingen Ems Germany using calcium silicate board system qualified to DIN 4102 Other methods for exterior protection of electrical circuits include boards made of sodium silicate bonded and pressed vermiculite and flexible wraps made of ceramic fibre and rockwool It is used in passive fire protection and fireproofing as calcium silicate brick or in roof tiles It is one of the most successful materials in fireproofing in Europe because of regulations and fire safety guidelines for commercial and residential building codes Where North Americans use spray fireproofing plasters Europeans are more likely to use cladding made of calcium silicate why High performance calcium silicate boards retain their excellent dimensional stability even in damp and humid conditions and can be installed at an early stage in the construction program before wet trades are completed and the building is weather tight For sub standard products silicone treated sheets are available to fabricators to mitigate potential harm from high humidity or general presence of water Fabricators and installers of calcium silicate in passive fire protection often also install firestops citation needed While the best possible reaction to fire classifications are A1 construction applications and A1Fl flooring applications respectively both of which mean non combustible according to EN 13501 1 2007 as classified by a notified laboratory in Europe some calcium silicate boards only come with fire classification of A2 limited combustibility or even lower classifications or no classification if they are tested at all citation needed Acid mine drainage remediation Edit Calcium silicate also known as slag is produced when molten iron is made from iron ore silicon dioxide and calcium carbonate in a blast furnace When this material is processed into a highly refined re purposed calcium silicate aggregate it is used in the remediation of acid mine drainage AMD on active and passive mine sites 8 Calcium silicate neutralizes active acidity in AMD systems by removing free hydrogen ions from the bulk solution thereby increasing pH As its silicate anion captures H ions raising the pH it forms monosilicic acid H4SiO4 a neutral solute Monosilicic acid remains in the bulk solution to play other important roles in correcting the adverse effects of acidic conditions As opposed to limestone a popular remediation material 9 calcium silicate effectively precipitates heavy metals and does not armor over prolonging its effectiveness in AMD systems 8 10 As a product of sealants Edit It is used as a sealant in roads or on the shells of fresh eggs when sodium silicate is applied as a sealant to cured concrete or egg shells it chemically reacts with calcium hydroxide or calcium carbonate to form calcium silicate hydrate sealing micropores with a relatively impermeable material 11 12 As a component of cement Edit It also occurs in cements where it is known as belite or in cement chemist notation C2S 13 Agriculture Edit Calcium silicate is often used in agriculture as a plant available source of silicon It is applied extensively to Everglades mucks and associated sands planted to sugarcane and rice 14 See also Edit Wikimedia Commons has media related to Calcium silicate Alite Jaffeite Plaster Perlite VermiculiteReferences Edit a b c d e NIOSH Pocket Guide to Chemical Hazards 0094 National Institute for Occupational Safety and Health NIOSH R B Heimann Classic and Advanced Ceramics From Fundamentals to Applications Wiley 2010 ISBN 352763018X a b Zumdahl Steven S 2009 Chemical Principles 6th Ed Houghton Mifflin Company p A21 ISBN 978 0 618 94690 7 SDS Sheet Library BNZ Materials Archived from the original on 2012 03 04 Retrieved 2017 07 19 H F W Taylor Cement Chemistry Academic Press 1990 ISBN 0 12 683900 X p 33 34 1 Archived 2008 12 25 at the Wayback Machine Food Additive Details Calcium silicate Archived from the original on June 5 2012 Retrieved July 28 2013 Codex General Standard for Food Additives GSFA Online Database FAO WHO Food Standards Codex alimentarius published by the Food and Agricultural Organization of the United Nations World Health Organization 2013 a b Ziemkiewicz Paul The Use of Steel Slag in Acid Mine Drainage Treatment and Control Wvmdtaskforce com Archived from the original on 20 July 2011 Retrieved 25 April 2011 Skousen Jeff Chemicals Overview of Acid Mine Drainage Treatment with Chemicals West Virginia University Extension Service Archived from the original on 24 May 2011 Retrieved 29 March 2011 Hammarstrom Jane M Philip L Sibrell Harvey E Belkin Characterization of limestone reacted with acid mine drainage PDF Applied Geochemistry 18 1710 1714 Archived from the original PDF on 5 June 2013 Retrieved 30 March 2011 Giannaros P Kanellopoulos A Al Tabbaa A 2016 Sealing of cracks in cement using microencapsulated sodium silicate Smart Materials and Structures 25 8 8 Bibcode 2016SMaS 25h4005G doi 10 1088 0964 1726 25 8 084005 Passmore S M 1975 Preserving eggs Nutrition amp Food Science 75 4 2 4 doi 10 1108 eb058634 Doval M Palou M amp Mojumdar S C J Therm Anal Calorim 2006 86 595 https doi org 10 1007 s10973 006 7713 0 Gascho Gary J 2001 Chapter 12 Silicon sources for agriculture Studies in Plant Science 8 8 197 207 doi 10 1016 S0928 3420 01 80016 1 ISBN 9780444502629 Retrieved from https en wikipedia org w index php title Calcium silicate amp oldid 1094752703, wikipedia, wiki, book, books, library,