1 two-stage crushing limestone screening washed three times .

Limestone  Initial crushing of jaw crusher , secondary crusher hammer crusher selection . After a crushing limestone screening by three , one , three straight sieve screening , secondary screening of rotary screen and add water, three times a hammer to break into the screening . This ensures that the soil does not contain miscellaneous pure limestone into plants.

After settling tank washing water will be recycled after separation miscellaneous soil .

Limestone crushing, washing and screening process is complicated section , process layout height up and down over 50m.

2 combination of wet and dry raw material preparation .

White siliceous raw materials used in cement production plus pyrophyllite quartz sand , siliceous dust in order to reduce environmental pollution , pyrophyllite plus roller press after jaw broken after two broken into two separate parallel wet grinding mill . Wet grinding the rubber lining and grinding pebbles , another raw material vertical roller mill and disc made ​​of alloy materials to reduce the grinding process of metallic iron mixed.

Limestone and other raw materials used in vertical mill grinding , pyrophyllite slurry in the vertical mill mixed with other materials , drying , a vertical mill raw material composition and moisture should ensure that qualified .

Since the preparation of raw materials used in the process of dry and wet two separate grinding , raw material into two control and material drying in the vertical mill , the biggest difficulty is the design .

3 . Guessed cooling system is quite complex.

Guessed the kiln temperature at first by a roll crusher station , then into the bleacher spray quench to about 100 ℃, the bleacher guessed transported via conveyor equipment , as white cement guessed water quenching process Guessed All sensible heat has been turned into steam evaporation can not be recycled , resulting in the firing of white cement heat consumption is much higher than that of ordinary portland cement . After the project is to control the water quenching temperature in the bleacher guessed at 550 ℃ ~ 600 ℃ into the bleacher second time grate cooler exhaust is cooled to below 100 ℃ . This makes grate cooler exhaust gases in the waste heat recovery, the grate cooler about 180 ℃ ~ 200 ℃ for rotary kiln exhaust secondary air and tertiary air calciner .

The above system bleaching machine design and production control is very difficult , bleaching machine must be fully within the spray atomization and spray limit within a certain range , that can only be sprayed on the kiln guessed , try not to spray bleach in the machine the brick lining in the bleacher to be completely evaporated water , the vapor bleacher temperature controlled at 350 ℃ ~ 400 ℃, the temperature control in the bleacher guessed 550 ℃ ~ 600 ℃.

White cement kiln firing system due in part to the complexity of the process , from process layout and the firing kiln and kiln firing tower with ordinary Portland cement kiln firing system layout elevation , with the same specifications kiln phase than all raised nearly 9m.

Also the bleacher 350 ℃ ~ 400 ℃ steam , in order to fully utilize this part of the waste heat in the kiln specially set up a hot- tube heat exchanger , when water vapor through a heat exchanger to heat the cold air can be 200 ℃ so, ( vertical mill ) drying petroleum coking coal mill.

4 Preheat decomposition kiln firing system using single five cyclone preheater and TTF three spray PRECALCINER , feeding can achieve four , five switching.

The preheater exhaust gas to be used for raw material drying medium vertical mill , according to theoretical calculations , when the raw material into the kiln drying ≤ 15% moisture requirements ; When raw material grinding moisture fluctuations, raw material moisture 15 when % to 16.5 %, with connecting pipes fed into the kiln control ( ie, four warm- working state ) from C3 ~ C2 -cyclone , the exhaust gas temperature at this time of the C1 level can be increased to 420 ℃ can meet the raw material drying requirements. Eventually feed into the vertical mill after birth by a cyclone dust collector exhaust after large bag filter dust collection efflux , when raw material vertical mill stopped , the C1 -cyclone exhaust gas through the cyclone C1 level to high temperature fan the winds of possession after the first spray cooling pipes to get into the bag filter .