Fig. 9From: Analysis of Active Ion-Leaching Behavior and the Reaction Mechanism During Alkali Activation of Low-Calcium Fly AshSEM micrographs of alkali-activated low-calcium fly ash treated with 2 M NaOH for different soaking times: a raw fly ash, b 3 h, c 72 h, d EDS spectrum of precipitates, e hollow sphere, and f 672 h.Back to article page