SYNTHESIS OF ARAGONITE BY THE CARBONATION PROCESS USING STAINLESS REFINING DUST IN IRON STEEL PLANTS

摘要

The conditions for the synthesis of aragonite by the carbonation process were investigated, and these results were applied to the recycling of stainless refining dust in iron & steel plants. The formation of aragonite has no relation to the pH value, the mole ratio of MgCl_2/Ca(OH)_2 and Mg/Ca ion concentration in solution. The condition for the synthesis of aragonite requires that the Concentration of Mg ions should be in an appropriate range (about 0.1÷0.26 mol/l) and the concentration of Ca ions below a certain range (less than about 0.16÷0.25 mol/l). Too many Ca ions or Mg ions favor the formation of calcite. Needle-like aragonite was successively synthesized using dusts and thus, effective recycling of dusts can be expected.