Characteristic variation of precipitate in limestone layer

摘要

In successive alkalinity-producing systems (SAPS), precipitate generated on limestone layer tends to be increased over time, deteriorating the permeability of SAPS and reducing the treatment efficiency of mine drainage as well as the life of SAPS. A flushing system, as the alternative to deal with it, has been emerged recently but the study on characteristics of precipitate that travels in pipe has still remained far behind. This study is intended to identify the characteristics of precipitate generated on limestone layer and thus, the growth test of precipitate was conducted and consequently, changes to the type of precipitate and physical & chemical properties were identified. Besides, minimum transport velocity of precipitate which is the major design factor in flushing system was estimated through the test.