A detailed characterization was performed of the particles produced under various Pb:Si molar feed ratios for a maximum flow reactor temperature of 1000 °C. The silica particles formed in the high temperature region coagulated and only partially coalesced to form large agglomerate structures of high specific surface area. For a lead-only feed, the resulting particles were hydrocerussite with small but detectable amounts of massicot. As the silica precursor was inlet in excess amounts (Pb:Si < 1:12, the crystalline lead compounds disappeared and amorphous lead-silica complexes dominated. The particle morphology also changed from cylindrical, polygonal, and spherical shapes to large agglomerate structures composed of several size modes of primary particles. At Pb:Si molar feed ratios of 1:12 and 1:29, the particles making up the chainlike agglomerate structure were primarily spherical, with larger lead silicate spherical particles (=0.5 μm) attached to the agglomerate. The lead was found to be distributed throughout the large agglomerate structures, implying easier capture of lead emissions in particulate control devices.
|Original language||English (US)|
|Number of pages||9|
|Journal||Journal of the Air and Waste Management Association|
|State||Published - Jun 1 1996|
ASJC Scopus subject areas
- Waste Management and Disposal
- Management, Monitoring, Policy and Law