MANUFACTURING OF HIGHEST CONCENTRATED QUA SIPELLETS BY SPHERICAL CRYSTALLIZATION OF IRON(II) SULFATE

For the example iron(II) sulphate, a process for the manufacturing of spherical cristalls is described, which produces iron(II) sulphate in DAB quality with a yield of about 70% in the fraction range of 0.5-1.0 0 mm using iron(II)sulphate in technical quality as raw material. Beca use ferrous sulphate in technical quality shows different behaviour fo r different batches of raw material, the influences of additions of sa me and foreign ions on the particle-size distribution of the spherical cristallisation process were determined and quantified.With the aid o f these results, possibilities for optimization of yield in the prefer red fraction range in spite of using lower quality of raw material wer e obtained.