Production Process of Sludge Expanded Aggregate

The handle methods for sludge have sea filling, embed, incineration and land utilize, but with many problems. If the handle sludge from sewage treatment plant by embeds, it costs a lot of processing costs and causes secondary pollution to the environment. Use sludge produce expanded aggregate, not only instead clay to produce expanded aggregate, save land, make waste profitable, but also high temperature sterilization, Curing heavy metal, to avoid pollution.

Production Process:

The sludge and clay are transported into plant by truck, storage in materials shell for natural drying sometimes, and then send to each hopper by forklift. One apron feeder under the clay hopper, and send clay to double roller crusher. It can be set several crusher to make clay size smaller, and then sent to double shaft mixer. Sludge also come into double shaft mixer by screw conveyor under the sludge hopper. Clay and sludge mixture in double shaft mixer fully, and sent to ageing yard for storage.

The ageing material are sent to hopper by forklift, and then through another double shaft mixer mixture, and go to double roller granulator for make pellet. The pellet come into shaper by belt conveyor, after shaper, the small pellet are screening out, qualified pellet are sent to plug-in type rotary kiln for preheat and calcinations. The calcined pellet drop to vertical cooler for cooling, and screening to different size products by rotary screen, storage in yard at final for packing and delivery. The cooling air in vertical cooler is heated to high temperature secondary air which as combustion air comes into rotary kiln; it can be save energy like this. Fuel is send into rotary kiln by high pressure induced draft fan for combustion through multichannel burner, the high temperature exhaust gas with dust come into air cooler, after   the temperature of dust air cooling, then come into bag filter and escape into the atmosphere after purification in bag filter.

Capacity and Main Equipment Parameter: