Abstract
The porous structure and dissolution of phlogopite, as a function of the conditions of acid-leaching, are discussed. Surface areas and pore distributions of the products from HNO 3 -, HCl- and H 2 SO 4 -leachings of the mica from the apatite mine of Siilinjärvi, Finland were analyzed. The pores formed during leaching were found to be slit-shaped or ink-bottle type, as indicated by adsorption—desorption isotherms of nitrogen. The pores formed on selective dissolution of potassium from phlogopite were so narrow that not even nitrogen could penetrate them. The products of leaching with HNO 3 were much more microporous than the products of leaching with HCl and H 2 SO 4 . The maximum values obtained for totally leached phlogopite were 620 m 2 g −1 and 0.46 cm 3 g −2 for surface area and total pore volume, respectively. The temperature of leaching, acid concentration and acid nature affected the results. Surface areas and pore distributions for leached phlogopite samples obtained were similar to those of the active coal and active kaolin used as reference materials.
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