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Research progress of solid waste treatment in rotary kilns |
WANG Guangwei1, LIU Jiawen1, LI Renguo1, XU Kun1, NING Xiaojun1, WANG Chuan2 |
1. School of Metallurgy and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Swerim AB, SE-971 25 Luleå, Sweden |
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Abstract The annual growth of industrial solid waste and urban solid waste output is in opposition to the green ecological environment as industrialization advances and living standards rise of residents. Landfills, composting and incineration are the main traditional methods for treating solid waste, nevertheless, they pollute the environment, have low utilization rates and other additional drawbacks. As a result of its significant processing capacity, straightforward operation and inexpensive price, rotary kilns have received a lot of attention recently. In the rotary kiln, the zinc-bearing iron dust can be dezincified to produce secondary zinc oxide powder that can be sold and iron-bearing resources that can be used again in the sintering process. The conversion of harmful Cr6+ to non-toxic Cr3+ is finished after the chromium sludge is pyrolyzed by the rotary kiln, and the national emission standards are satisfied. The waste tire recycling technique with the highest capacity is pyrolysis in the rotary kiln, which is the utilization method of waste tires backed by national policies. Besides, its product has high calorific value, little pollution, and is simple to transport. The only sustainable carbon source is biomass, and the calorific value and energy density of biomass can be increased by pyrolysis technology. The rotary kiln, which is the most popular biomass pyrolysis device, serves as the foundation for the use of biomass energy and the decrease of carbon emissions. Gypsum desulfurization using integrated rotary kiln drying and calcination process is simple method that can be used to renovate old rotary kilns. In conclusion, rotary kilns are thought as low-carbon and effective device of solid waste disposing, and they will be essential for green economic growth and the transformation and upgrading of industrial structures.
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Received: 04 May 2023
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