| 形态 | Fine white powder with particle
sizes generally below 1mm. This is not
the same as the commercial products “fumes
silica,” “silica gel,” “precipitated silica,” or
“fused silica.” It is formed during the electric
arc production of elemental silicon from quartz, which is reduced to silicon monoxide,
escaping from the furnace and oxidized by air
to silicon dioxide. This condenses to form
spherical particles. For the production of ferrosilicon,
iron metal is added to the charge;
during charging there is also exposure to
crystalline silica. |
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