Rotary Kiln belongs to building material equipment, according to
different materials, which can be divided into cement kiln,
metallurgy chemical kiln and lime kiln. Cement kiln is used for
making cement clinker and there are dry and wet methods to make
cement clinker. Metallurgy chemical kiln is widely used for
magnetic roasting of poor iron ore and oxidizing roasting of chrome
and nickel in the steel factory; backing high-alumina mine in the
refractory material factory; baking chamotte and alumina in the
aluminum factory and baking chrome ore and chrome powder in the
chemical plant. The Lime Kiln is used for roasting active lime in
steel works and ferroalloy plants and light roasting dolomite.
CITIC IC rotary kiln technical data sheet:
Product specifications (m) | Kiln dimensions | Capacity (t/d) | Rotation speed (r/min) | Motor power (kw) | Total weight (t) |
| Diameter(m) | Length(m) | Obliquity(%) |
| Φ2.5×40 | 2.5 | 40 | 3.5 | 180 | 0.44-2.44 | 55 | 149.61 |
| Φ2.5×50 | 2.5 | 50 | 3 | 200 | 0.62-1.86 | 55 | 187.37 |
| Φ2.5×54 | 2.5 | 54 | 3.5 | 204 | 0.48-1.45 | 55 | 196.29 |
| Φ2.7×42 | 2.7 | 42 | 3.5 | 320 | 0.10-1.52 | 55 | 198.5 |
| Φ2.8×44 | 2.8 | 44 | 3.5 | 400 | 0.437-2.18 | 55 | 201.58 |
| Φ3.0×45 | 3 | 45 | 3.5 | 500 | 0.5-2.47 | 75 | 210.94 |
| Φ3.0×48 | 3 | 48 | 3.5 | 700 | 0.6-3.48 | 100 | 237 |
| Φ3.0×60 | 3 | 60 | 3.5 | 300 | 0.3-2 | 100 | 310 |
| Φ3.2×50 | 3.2 | 50 | 4 | 1000 | 0.6-3 | 125 | 278 |
| Φ3.3×52 | 3.3 | 52 | 3.5 | 1300 | 0.266-2.66 | 125 | 283 |
| Φ3.5×54 | 3.5 | 54 | 3.5 | 1500 | 0.55-3.4 | 220 | 363 |
| Φ3.6×70 | 3.6 | 70 | 3.5 | 1800 | 0.25-1.25 | 125 | 419 |
| Φ4.0×56 | 4 | 56 | 4 | 2300 | 0.41-4.07 | 315 | 456 |
| Φ4.0×60 | 4 | 60 | 3.5 | 2500 | 0.396-3.96 | 315 | 510 |
| Φ4.2×60 | 4.2 | 60 | 4 | 2750 | 0.4-3.98 | 375 | 633 |
| Φ4.3×60 | 4.3 | 60 | 3.5 | 3200 | 0.396-3.96 | 375 | 583 |
| Φ4.5×66 | 4.5 | 66 | 3.5 | 4000 | 0.41-4.1 | 560 | 710.4 |
| Φ4.7×74 | 4.7 | 74 | 4 | 4500 | 0.35-4 | 630 | 849 |
| Φ4.8×74 | 4.8 | 74 | 4 | 5000 | 0.396-3.96 | 630 | 899 |
| Φ5.0×74 | 5 | 74 | 4 | 6000 | 0.35-4 | 710 | 944 |
| Φ5.6×87 | 5.6 | 87 | 4 | 8000 | Max4.23 | 800 | 1265 |
| Φ6.0×95 | 6 | 95 | 4 | 10000 | Max5 | 950×2 | 1659 |
CITIC IC carbonization rotary kiln used kiln technical
characteristics:
♦ Kiln body is made of high quality composed of carbon steel or
alloy steel plate and automatic welding;
♦ Tyre,Support Roller,Open gear adopts alloy cast steel;
♦ Sliding bearing with large gap not scraping tile bearing;
♦ Transmission device adopts hard tooth surface reducer, flexible
diaphragm coupling, dc motor;
♦ Adopts hydraulic gear wheel;
♦ Preheater scales were used respectively to veiw of kiln head, and
cylinder pressure tight seal;
♦ A slow drive device.
With the arrival of rotary kilns, cement manufacturing processes
became sharply defined according to the form in which the raw
materials are fed to the kiln. Raw materials were
either ground with addition of water, to form a slurry containing
typically 30-45% water, or they were ground dry, to form a powder
or "raw meal".
In the Wet Process, the kiln system is fed with liquid slurry, the
water then being evaporated in the kiln.
In the Semi-Wet Process, raw material is prepared as a slurry, but
a substantial proportion (50-80%) of the water is mechanically
removed, usually by filtration, and the
resulting "filter cake" is fed to the kiln system.
In the Dry Process, the kiln system is fed with dry raw meal
powder.
In the Semi-Dry Process, a limited amount of water (10-15%) is
added to dry raw meal so that it can be nodulised, and the damp
nodules are fed to the kiln system.
The original rotary cement kilns were called 'wet process' kilns.
In their basic form they were relatively simple compared with
modern developments. The raw meal was supplied
at ambient temperature in the form of a slurry.
A wet process kiln may be up to 200m long and 6m in diameter. It
has to be long because a lot of water has to be evaporated and the
process of heat transfer is not very efficient.
The slurry may contain about 40% water. This takes a lot of energy
to evaporate and various developments of the wet process were aimed
at reducing the water content of
the raw meal. An example of this is the 'filter press' (imagine a
musical accordion 10-20 metres long and several metres across) -
such adaptions were described as 'semi-wet' processes.
The wet process has survived for over a century because many raw
materials are suited to blending as a slurry. Also, for many years,
it was technically difficult to get dry
powders to blend adequately.
In a modern works, the blended raw material enters the kiln via the
pre-heater tower. Here, hot gases from the kiln, and probably the
cooled clinker at the far end of the kiln, are
used to heat the raw meal. As a result, the raw meal is already hot
before it enters the kiln.
The dry process is much more thermally efficient than the wet
process.
