Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method for in-situ solidification and stabilization of phosphogypsum soluble substance
The invention belongs to the technical field of environmental protection and treatment, and relates to harmless treatment of industrial solid waste, in particular to a method for in-situ solidification and stabilization of phosphogypsum soluble substances. The method comprises the following steps: adding water into ardealite from wet-process phosphoric acid production, blending into slurry with the solid content of 40-60wt%, adjusting the pH value to be more than 12 by using a substance capable of generating calcium hydroxide when meeting water in a stirring state, adding calcium phosphate, a surfactant and an adsorbent, reacting for 10-30 minutes, finally adjusting the pH value of the slurry to be 6-9 by using strong acid, and analyzing the ardealite slurry percolate. Pollutants such as fluorine, phosphorus, pH and the like in the percolate meet the A-class discharge requirements of the primary standard in the GB8978-1996 sewage comprehensive discharge standard, that is, the phosphorus content is less than 0.5 mg/L, the fluorine content is less than 10mg/L, and the pH is 6-9. According to the method disclosed by the invention, soluble substances in the phosphogypsum are solidified and stabilized, the quality of the phosphogypsum is improved, a high-quality raw material is provided for subsequent resource utilization of production of building gypsum powder, a cement retarder and a soil conditioner from the phosphogypsum, and meanwhile, convenience can be provided for dam-free stockpiling of the phosphogypsum.
本发明属于环境保护及治理技术领域，涉及工业固体废弃无害化处理，具体为一种磷石膏可溶物原位固化稳定的方法。将来自湿法磷酸生产的磷石膏加水兑成固含量为40‑60wt%的浆料，在搅拌状态下用遇水能生成氢氧化钙的物质调pH至12以上，加入磷酸钙盐、表面活性剂、吸附剂，反应10‑30min，最后用强酸调整料浆pH到6‑9，取磷石膏料浆渗出液进行分析，渗出液中氟、磷及pH等污染物满足GB8978‑1996污水综合排放标准中一级标准的A类排放要求，即磷含量＜0.5mg/L、氟含量＜10mg/L、pH为6‑9。通过本发明的方法固化稳定了磷石膏中可溶物，提升了磷石膏品质，为后继磷石膏生产建筑石膏粉、水泥缓凝剂、土壤改良剂资源化利用提供了优质原料，同时亦可为磷石膏无坝堆存提供便利。
Method for in-situ solidification and stabilization of phosphogypsum soluble substance
The invention belongs to the technical field of environmental protection and treatment, and relates to harmless treatment of industrial solid waste, in particular to a method for in-situ solidification and stabilization of phosphogypsum soluble substances. The method comprises the following steps: adding water into ardealite from wet-process phosphoric acid production, blending into slurry with the solid content of 40-60wt%, adjusting the pH value to be more than 12 by using a substance capable of generating calcium hydroxide when meeting water in a stirring state, adding calcium phosphate, a surfactant and an adsorbent, reacting for 10-30 minutes, finally adjusting the pH value of the slurry to be 6-9 by using strong acid, and analyzing the ardealite slurry percolate. Pollutants such as fluorine, phosphorus, pH and the like in the percolate meet the A-class discharge requirements of the primary standard in the GB8978-1996 sewage comprehensive discharge standard, that is, the phosphorus content is less than 0.5 mg/L, the fluorine content is less than 10mg/L, and the pH is 6-9. According to the method disclosed by the invention, soluble substances in the phosphogypsum are solidified and stabilized, the quality of the phosphogypsum is improved, a high-quality raw material is provided for subsequent resource utilization of production of building gypsum powder, a cement retarder and a soil conditioner from the phosphogypsum, and meanwhile, convenience can be provided for dam-free stockpiling of the phosphogypsum.
本发明属于环境保护及治理技术领域，涉及工业固体废弃无害化处理，具体为一种磷石膏可溶物原位固化稳定的方法。将来自湿法磷酸生产的磷石膏加水兑成固含量为40‑60wt%的浆料，在搅拌状态下用遇水能生成氢氧化钙的物质调pH至12以上，加入磷酸钙盐、表面活性剂、吸附剂，反应10‑30min，最后用强酸调整料浆pH到6‑9，取磷石膏料浆渗出液进行分析，渗出液中氟、磷及pH等污染物满足GB8978‑1996污水综合排放标准中一级标准的A类排放要求，即磷含量＜0.5mg/L、氟含量＜10mg/L、pH为6‑9。通过本发明的方法固化稳定了磷石膏中可溶物，提升了磷石膏品质，为后继磷石膏生产建筑石膏粉、水泥缓凝剂、土壤改良剂资源化利用提供了优质原料，同时亦可为磷石膏无坝堆存提供便利。
Method for in-situ solidification and stabilization of phosphogypsum soluble substance
一种磷石膏可溶物原位固化稳定的方法
YANG YINGLUN (Autor:in) / XIA JUPEI (Autor:in)
19.09.2023
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
METHOD FOR SYNERGISTIC STABILIZATION/SOLIDIFICATION OF RED MUD AND PHOSPHOGYPSUM
| Europäisches Patentamt | 2020