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Crystal growth of phospho-gypsum in Na2SO4 solution

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2011, 21(1), pp.6-14
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

이계승 1 이정미 2 Song Young Jun 1 Kang Ho Shin 1 Kim Youn Che 1 Si Nae Yoon 3 Yun Ho Jang 1 Lee Sung Riong 1

1강원대학교
2한국광물자원공사
3대구산업정보대학

Accredited

ABSTRACT

The re-crystallization process for recovering granular crystalline gypsum from phospho-gypsum have proposed. The process consists of two stages; at the first stage, needle-like fine gypsum is recovered with under-product of 325 mesh wet screening after the speedy hydration of dehydrated phospho-gypsum, and at the second stage, granular crystalline gypsum is recovered with upper-product of 325 mesh wet screening after dehydration and re-crystallization of the needlelike fine gypsum in Na2SO4 solution. This paper is mainly focused on the influence of dehydration time, cooling speed of temperature and re-crystallization temperature on the recovery of granular crystalline gypsum. And the re-crystallization velocity of needle-like fine gypsum at room temperature and the variation of Ca 2+ concentration of gypsum slurry during over all re-crystallization process were also discussed.

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