Solid Waste Grinding Special Vertical Mill learned that the cement industry encourages the use of non-carbonate raw materials such as calcium carbide slag, paper sludge, desulfurized gypsum, fly ash, metallurgical slag tailings and volcanic ash to replace traditional limestone raw material. So how to use papermaking sludge? What about the processing technology?

The cement industry encourages the use of non-carbonate raw materials such as calcium carbide slag, paper sludge, desulfurized gypsum, fly ash, metallurgical slag tailings and volcanic ash to replace traditional limestone raw material. So how to use papermaking sludge? What about the processing technology?

With the continuous development of society, the monitoring of enterprises’ “waste water, solid waste, and waste gas” emissions has gradually increased. The fine fibers and inorganic salts in the papermaking process are deposited in large quantities in the primary and secondary sedimentation tanks of wastewater treatment to form sludge. For every 1000 kg of paper produced, about 500-700 kg of wet sludge is produced, and the composition is complex, High water content, more difficult to handle. At present, most paper mills often use traditional methods such as thickening, extrusion into blocks, boiler combustion or landfill, which not only have high processing costs, but also easily cause secondary pollution.

How to use papermaking sludge in cement industry? What is the process?

The existing new dry-process cement clinker production line is used to produce cement clinker and co-process sludge. Paper sludge with a moisture content of ≥ 70% is directly added to the vertical mill , mixed with cement raw materials and finely ground to obtain cement raw meal. The amount of papermaking sludge added is 5% to 12% of the weight of cement raw meal. After homogenization, it is introduced into the calcination system and fired into cement clinker; The kiln exhaust gas is passed into the vertical mill for drying. This method does not need to put sludge and cement raw materials into the vertical mill through pre-batching, mixing and belt conveying processes, and does not need to pre-dehydrate or dry the sludge. It can treat sludge with high moisture content, with large processing capacity and no secondary pollution, and can save cement raw materials such as limestone and clay, and has no adverse effect on the quality of cement clinker.