How to make secondary use of paper waste residue?

　　How can such a tricky environment killer be reused?

　　The papermaking waste residue is aerated concrete made from pulverized coal ash or sand and cement, lime as the main raw material, adding appropriate amount of adjusting material (gypsum) and a small amount of gas generating material (aluminum paste), and through raw material processing, mixing of ingredients, static stop cutting A new type of wall material formed by autoclaving.

　　There are two kinds of solid residues - ash and slag after the waste residue is burned in the boiler. As the flue gas is discharged from the tail of the boiler, the solid particles collected by the dust collector are fly ash; the particles are larger or have a blocky shape and are collected from the bottom of the hearth as bottom slag. From the perspective of comprehensive utilization of fly ash, generally include slag, collectively referred to as ash. Fly ash is mainly composed of silica-alumina glass, microcrystalline mineral particles and unburned residual carbon particles. Its chemical composition is mainly silica and alumina. The traditional method of handling fly ash is mainly adopted in the form of open-air dumping, and a small amount is used for reclamation, lake filling and land requisition. However, long-term open storage does not only occupy a large area of land, pollute the air, but also cause serious pollution of groundwater. In China, the amount of fly ash is huge and the growth rate is extremely fast. At present, it exceeds 100 million tons per year, which is increasing the environmental pollution. The management and comprehensive utilization of fly ash has caused great concern.

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