Dissolution of Sparingly Soluble Inorganic Compound to Aqueous Suspension with Ion Exchange Resin (Part 3)

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  • NISHINO Tadashi
    Laboratory of Inorganic Materials, Musashi Institute of Technology
  • WON Xouda
    Laboratory of Inorganic Materials, Musashi Institute of Technology

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Other Title
  • イオン交換樹脂を含む懸濁水への難溶性無機化合物の溶解 (第3報)
  • イオン コウカン ジュシ オ フクム ケンダクスイ エ ノ ナンヨウセイ ムキ
  • AlPO<sub>4</sub> and BaSO<sub>4</sub>
  • リン酸アルミニウム及び硫酸バリウム

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Dissolution rate of AlPO4 powder with different modifications in aqueous suspension containing H-R, strongly acidic H-formed ion exchange resin, was investigated as a function of suspension concentration, temperature and stirring speed. Dissolution of BaSO4 powder was carried out under the similar experimental conditions, for comparison. Fractional dissolution was calculated from the analytical result of liberated amounts of PO43- and SO42- brought about by the cation exchange reaction.<br>The results obtained were summarized as follows;<br>(1) Well-crystallized quartz-type AlPO4 (b-AlPO4) did not dissolve appreciably, whereas cristobalite-type AlPO4 (c-AlPO4), heat-treated sample of b-AlPO4, dissolved considerably for its metastability.<br>(2) Dissolution of AlPO4 did not so accelerated by suspension concentration as compared with BaSO4.<br>(3) Dissolution tendency of both AlPO4 and BaSO4 increased with increasing temperature.<br>(4) Stirring increased the collision frequency between sample powder and H-R particle to enhance the dissolution rate, in general, as shown in BaSO4. However, the increase in stirring speed hinders the dissolution tendency of AlPO4 because of slow exchange reaction at the collision interface.

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