Registration Dossier
Registration Dossier
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EC number: 273-761-1 | CAS number: 69012-64-2 Amorphous silicon dioxide particles from the volatilization and vaporization of furnace feed materials in the manufacture of ferrosilicon and silicon.
Adsorption / desorption
Administrative data
- Endpoint:
- adsorption / desorption
- Remarks:
- adsorption
- Adequacy of study:
- supporting study
Data source
Reference
- Reference Type:
- publication
- Title:
- Silicate and Phosphate Adsorption on Gibbsite Studied by X-ray Photoelectron Spectroscopy Angular Distributions
- Author:
- Alvarez, Robustiano., Charles S. Fadley, and James A. Silva
- Year:
- 1 980
- Bibliographic source:
- Soil Sci Soc Am J 1980 44: 422-425.
Materials and methods
Test guideline
- Qualifier:
- no guideline followed
- Type of method:
- batch equilibrium method
- Media:
- other: synthetic gibbsite
Test material
- Reference substance name:
- Tetrahydroxysilane
- EC Number:
- 233-477-0
- EC Name:
- Tetrahydroxysilane
- Cas Number:
- 10193-36-9
- IUPAC Name:
- orthosilicic acid
Constituent 1
Study design
Batch equilibrium or other method
- Analytical monitoring:
- not required
- Details on test conditions:
- The adsorbent chosen for this study was solid A1(OH)3 powder with a surface area of 9.7 m2/g as measured by the BET method. The adsorbates were aqueous solutions of Si(OH)4 (75 ppm Si) CaSiO3 (75 ppm Si), , Ca(NO3)2 (0.005M), and Ca(H2PO4)2 (0.01M). The gibbsite was
shaken with unbuffered solutions of the adsorbates for three hours and allowed to equilibrate for 8 hours then was separated by filtration through a Buchner funnel, and the remaining solid leached with a relatively large volume of water [solid to water ratio = 1:50]. Most of the more
weakly bonded adsorbate species would be removed from the gibbsite surface by this leaching. The solid samples were then dried for eight hours at 55°C at atmospheric pressure and subsequently pressed into small wafers. Examination of the surfaces of these wafers was carried out with a
Hewlett Packard 5950A ESCA spectrometer capable of an instrumental resolution of —0.5 eV. The pressure in the spectrometer chamber during these measurements was ~10"8 torr.
Duration of adsorption equilibration
- Duration:
- 11 h
Results and discussion
Applicant's summary and conclusion
- Executive summary:
Summary of observations:
1) No Si was detected on the A1(OH)3 surface in the Si(OH)4 treatment which suggests weak adsorption of Si on gibbsite in the absence of Ca.
2) When CaSiO3 was the adsorbate, both Ca and Si were detected on the adsorbent surface with an approximate Ca/Si ratio of 1/8.
3) Ca and P were both present on the adsorbent after Ca(H2PO4)2 treatment.
4) Atomic concentration ratio estimates calculated from peak intensities, kinetic energies, and photoelectron cross-sections, showed that Ca/Si exceeds Ca/P on the alumina surface.
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