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| Effect of Calcination Temperature and Holding Time on Characteristics of Thermal Decomposition Products of Waste Paper Sludge |
| Received:September 29, 2022 |
| DOI：DOI：10.11980/j.issn.0254-508X.2023.03.005 |
| Key Words:calcination condition waste paper sludge mineral composition microscopic morphology physical and chemical properties |
| Fund Project:河南省科技攻关计划项目（222102320262）。 |
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| Abstract:In order to improve the resource utilization efficiency of waste paper sludge， waste paper sludge from the paper mill in Zhengzhou was selected as the experimental raw material. Thermal analysis-mass spectrometry instrument （TA-MS）， X-ray diffractometer （XRD）， scanning electron microscope （SEM）， and other modern instruments were used for characterization. The effects of calcination temperature and holding time on the characteristics of thermal decomposition products of waste paper sludge were investigated. The results showed that the thermal decomposition process of waste paper sludges was mainly divided into four mass loss stages： water precipitation， organic matter decomposition， kaolinite conversion， and calcium carbonate decomposition. The main mineral components of waste paper sludges were calcite， quartz， and kaolinite. Increasing calcination temperature and prolonging holding time were beneficial to improve the crystallinity of calcite. Compared with the uncalcined sample， the carbon content of the sludge ash of waste paper papermaking at 550 ℃ was reduced by appropriate 30%， the carbon content of the sludge ash at 850 ℃ was reduced by appropriate 85%， and the carbon content of the sludge ash at 8 h was reduced by appropriate 44%. Appropriate amount of mixing waste paper sludge ash was helpful to improve the activity of cement cementitious system. |
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