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High Quality Fused Silica from Egyptian Silica Sand Concentrate

Journal Name:

  • International Journal of Science and Engineering Investigations

Publication Year:

  • 2017

Key Words:

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Abstract (2. Language): 
White silica sand from the Eastern Desert of Egypt was subjected to intensive beneficiation program to match the international grade requirements of ultra-pure fused product. Size distribution analysis of the sand sample indicates that by rejecting the +0.4 mm coarse fraction, representing about 24.7% by weight and assaying 0.036% Fe2O3, the -0.4 mm undersize assays only 0.013% Fe2O3. Attrition scrubbing of this size cut followed by a combined flotation-magnetic separation circuit, final sand concentrates assaying 0.0059% Fe2O3 and 0.015% Al2O3 was obtained with an overall recovery of 70%. Chemical leaching of this concentrate, by using HCl and stannous chloride at 50-60°C, led to the production of ultra-pure sand concentrate having 0.0043% Fe2O3. Fused silica was prepared using either an arc furnace or an electrical resistance heating Tamman furnace. The arc furnace product was greyish brown in colour and coated with carbon dissipated from the graphite hearth and the electrodes which affected its chemical constitution and physical properties. But product of the electrical Tamman furnace was clear and exhibited excellent physico-mechanical properties that satisfy very well the requirements for high temperature refractory materials, special refractory industries, investment casting and as a filler for epoxy molded resins.
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REFERENCES

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International Journal of Science and Engineering Investigations, Volume 6, Issue 62, March 2017 166
www.IJSEI.com Paper ID: 66217-20
ISSN: 2251-8843
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