| 摘要 |
A method for roller-granulating potassium-sulphate, using starch as an aid to granulation. The method involves dry activation-grinding of some of the potassium-sulphate, moistening the material to be granulated with practically pure water, building up the green granules by rolling upon a granulating pan or in a tumbling barrel, and drying the said green granules, at a temperature of between 105 and 120.degree.C, to a residual moisture of between 0.1 and 0.5%. In order to improve the wetability of the primary particles, and to reduce the amount of water needed for moistening, a soluble salt of lignin-sulphonic acid is added in an amount of between 0.1 and 1 kg/t of fresh material to be granulated.
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