Author:
Zhao Xi,Zhang Shiyi,Ma Haoran,Xie Huaqing,Guo Rui
Abstract
Industrial waste salt is mainly produced by industrial production processes of pesticides, drug synthesis, printing and dyeing, as well as solid-liquid separations, concentration and crystallization of solution, and sewage treatment, etc. At the present stage, the annual output of waste salt in China has exceeded 2.0×107 tons and the high-temperature melting method is considered to be a promising treatment method, but there are problems such as molten salt adhesion and agglomeration, unused high-temperature sensible heat, and waste of water resources. A novel process for waste heat recovery by high temperature melting dry method is proposed in this paper, using a combination of centrifugal granulation and waste heat recovery to dispose high-temperature molten salt and effectively recover heat. Through thermal equilibrium analysis and calculation, the waste heat recovering efficiency of the waste heat recovery using the novel process can reach up to 98%. Taking the annual treatment of 100,000 tons of waste salt as an example, the benefits of effective heat recovery converted to standard coal could be approximately 5 billion. While efficiently utilizing waste heat resources, the novel process brings considerable economic benefits to enterprises, has good industrial application prospects, and helps to advance the process of national hazardous waste solid waste treatment.
Reference5 articles.
1. Qixin Chen, Jia Wei. Typical process and prospect analysis of industrial waste salt resource utilization[J]. Energy Conservation and Environmental Protection, 2021(06): 78–80.
2. Petr K., Navratil J. D., Jan J. Scientific and engineering literature mini review of molten salt oxidation for radioactive waste treatment and organic compound gasification as well as spent salt treatment [J]. Science and Technology of Nuclear Installations, 2015:1–10.
3. Haiyun Zhou, Yezhong Bao, Mingjing Zou et al. Practice and analysis of high-temperature melting treatment technology in rotary kiln for pesticide waste salt[J]. Industrial Water Treatment, 2021, 41(08): 140–145.
4. Haiyun Zhou, Yechuang Bao, Jian Bao, Jianzhong Zhu. Research progress on the status quo of industrial waste salt treatment and disposal [J]. Environmental Science and Technology, 2020, 33(02): 70–75.