摘要
Abstract
Phosphogypsum is a solid waste produced in the wet-process phosphoric acid process,its harmless treat-ment and disposal is the key link to ensure the sustainable development of phosphorus chemical industry.Phosphogyp-sum contains phosphate,free inorganic acid,organic matter,fluoride and other impurities,which must be harmlessly treated before it can be applied to the agricultural field.This paper summarizes the harmless treatment technology of phosphogypsum,including physical method,chemical method,biological method and target pollutant oriented treat-ment method.The principle of harmless treatment is to remove the harmful components in phosphogypsum,or change the internal structure characteristics of phosphogypsum,so as to indirectly reduce the content of harmful substances in phosphogypsum.The research status of harmlessly treated phosphogypsum for the preparation of medium-element fer-tilizers,soil amendments,slow-release fertilizers and soil microbial additives was reviewed.It is recommended to carry out technological research and development in the future to address the large fluctuations in the composition of phos-phogypsum raw materials,in order to improve product stability.In addition,efforts should be made to achieve new breakthroughs in the process of producing slow-release fertilizers from phosphogypsum,in order to enhance the level of high-value utilization of phosphogypsum.关键词
磷石膏/土壤改良/无害化处理/缓释肥/微生物助剂/有害杂质Key words
phosphogypsum/soil improvement/harmless treatment/slow-release fertilizer/microorganism assis-tant/harmful impurities分类
化学工程
