| 摘要 |
The present invention relates to a method for the wasteless processing of great quantities of phosphate gypsum waste into a form suitable for use as additive in colours, enamels, synthetic resins, and as binding component for especially loose soils for road constructions. The method for processing of phosphate gypsum waste consists of three heating steps in the temperature range of 460-650 K during about 60 minutes until pH over 5,9 is obtained. The process is running in machinery which includes a horizontal rotating chamber (1), on the inside of which on the axis a fixed cylinder (2) is attached, wherethrough a heating factor is passing in opposite direction. The rotating chamber (1) consists of three processing zones (3), (4), (5). The first zone (3) has on the inner periphery loosely set chain units (7), the second zone (4) is equipped with a worm-wheel (8) firmly set on the fixed cylinder (2), and the third zone (5) has on the full length a free hanging chain unit (11) and at least two rows of flat wing units (12). |
