Brass does not fire... it melts.
Whether brass can survive a kiln firing depends on the temperature you are firing to...
Brass melts above 900 C.
It get REALLY soft above 700C
Kilns can fire much higher than that. So, its not a good idea
This is a correction to the previous answer. Many kilns are programmable. While these kilns have a max temp, you can go as low as you want. So you can easily program a kiln to heat at 900C.
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You can fire certain plaster mixtures in a kiln. These mixtures are typically used for casting bronze or aluminum and they disintegrate upon firing. But firing just plain plaster in a kiln is not a good idea. Plaster disintegrates at a very low temperature compared to the high temperature kilns are capable of, so if you're trying to dry plaster molds or anything like that in your kiln I would not recommend it. I've also heard that firing plaster can create some toxic fumes.
Kiln
There is raccu kiln, electrical kiln, and gas kiln.
Temperatures in a kiln are generally measured in two ways: by a pyrometer or by a pyrometric cone. Pyrometers are electronic thermometers which read the temperature inside the kiln. Pyrometric cones are pieces of ceramic formulated to bend at specific temperatures in a kiln. Most potters use both methods of measuring temperature because the temperature at which clays and glazes fire is very critical.
As a thumb rule the kiln inclination is 3.5% of its length.
A down draft kiln is a furnace where the flue (exit for burned gases) is the located near bottom of the fire box. This type of furnace requires a tall chimney to produce enough draft (or air flow) and typically produces even heat distribution through out the fire box.