Ceramic membranes with satisfactory
chemical stability and high
mechanical strength have wide chemical industrial applications in
treating wastewater at harsh conditions. However, the ceramic supports
usually need to be sintered at high temperatures to provide high mechanical
strength for the ceramic membranes, thus requiring higher energy consumption.
Herein, “ball effect” of spherical fly ash particles
(as sintering aids) has been put forward to simplify the mixing process
among the alumina powders and decreased the sintering consumption
of ceramics without a ball milling process, thereby facilitating the
fabrication of tubular ceramic supports for industrial applications.
The liquid phase sintering mechanism has also been discussed from
three aspects, including sintering temperature, fly ash loading, and
holding time. After that, ceramics with high bending strength and
high permeability were successfully prepared, and thus used as the
supports for fabricating ceramic microfiltration (MF) membranes (with
a permeability of 1.2 m3 m–2 h–1 bar–1 and a pore size of 150–200 nm). The
MF membranes also showed a great potential to treat industrial spent
tin wastewater from printed circuit boards. This study provides comprehensive
research on analyzing the mixing mechanism and liquid phase sintering
mechanism of ceramic supports and promotes the actual industrial applications.
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