Hydrothermal Transport and Deposition of Silica

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The strong Si-O-bond under dry conditions and in absence of impurities needs high activation energy for mobilization. Chemical activation with water based on the reaction: SiO{sub 2(s)} + nH{sub 2}O{sub (g,f)} = SiO{sub 2} {center_dot} nH{sub 2}O{sub (g,f)} lowers the energy barriers remarkably. Under normal conditions the equilibrium is extremely shifted to the left, however at increased temperatures and water-pressures (hydrothermal conditions) the reaction may cause strong chemical transport. The efficiency (rate) of transport depends on the physico-chemical and physical parameters (temperature, pressure, viscosity e.g.) as well as on the mechanism of flow. The phase composition and micro-structure of the ... continued below

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Florke, Otto W. January 1, 1976.

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Description

The strong Si-O-bond under dry conditions and in absence of impurities needs high activation energy for mobilization. Chemical activation with water based on the reaction: SiO{sub 2(s)} + nH{sub 2}O{sub (g,f)} = SiO{sub 2} {center_dot} nH{sub 2}O{sub (g,f)} lowers the energy barriers remarkably. Under normal conditions the equilibrium is extremely shifted to the left, however at increased temperatures and water-pressures (hydrothermal conditions) the reaction may cause strong chemical transport. The efficiency (rate) of transport depends on the physico-chemical and physical parameters (temperature, pressure, viscosity e.g.) as well as on the mechanism of flow. The phase composition and micro-structure of the silica-deposit formed by the reverse process, strongly depends on the rate of transport and deposition and on temperature of the substrate.

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  • Conference on Scale Management in Geothermal Energy Development, San Diego, CA, August 2--4, 1976

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  • Report No.: COO--2607--4;CONF-760844-1
  • Grant Number: E(11-1)-2607;NSF-G-AER-74-17445
  • Office of Scientific & Technical Information Report Number: 886846
  • Archival Resource Key: ark:/67531/metadc874183

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1976

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 29, 2016, 1:50 p.m.

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Florke, Otto W. Hydrothermal Transport and Deposition of Silica, article, January 1, 1976; United States. (digital.library.unt.edu/ark:/67531/metadc874183/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.