Study of Semi-Dry High Target Solidification/Stabilization of Harmful Impurities in Phosphogypsum by Modification

Abstract

Phosphogypsum (PG) treatment is one of the research hotspots in the field of environmental protection. Many researchers both at home and abroad have devoted themselves to studies on harmless resource treatment of PG, but the treatment technology is unable to meet the demand of PG consumption due to the huge production and storage demands. In order to solve the problem of PG pollution, this study explored the different solidified effects of various modification formulations on the hazardous components in PG, using industrial solid waste calcium carbide slag (CCS) as an alkaline regulator; Portland cement (PC), polyaluminum chloride (PAC) and CaCl2 as the main raw materials of the solidification and stabilization formula and the water content in PG as the reaction medium. The results showed that CCS (0.5%), PC (0.4%) and PAC (0.3%) had a more significant solidified effect on phosphorus (P) and fluoride (F). PAC was added in two steps and reacted under normal temperature and pressure, and its leaching toxicity meets the requirements of relevant standards, which laid an excellent foundation for PG-based ecological restoration materials and filling materials, with low economic cost, simple process and strong feasibility. This will provide great convenience for the later mining and metallurgy.

Recycling phosphogypsum in road construction materials and associated environmental considerations: A review

“…Wu et al. found that the 0.5% calcium carbide slag, as an alkaline conditioning agent, mixed with 0.4% silicate cement, 0.3% polymeric aluminium chloride and CaCl 2 had a significant curing effect on P and F. The leaching toxicity met the requirements of the relevant standard ( Wu et al., 2022c ), laying a good foundation for PG-based eco-remediation materials and fillers. The use of calcium carbide slag as an alkali neutraliser for PG has the advantages of low economic cost, simple process, and high feasibility.…”

Production Waste Management: Qualitative and Quantitative Characteristics and the Calculation of the Hazard Class of Phosphogypsum

“…Wu et al [30] studied the effect of the hardening of various modification compositions on hazardous components of phosphogypsum (Yunnan Yuntianhua Environmental Protection Technology Co., Ltd., Wuhan, China) using calcium carbide slag from industrial solid waste (CCS) as an alkaline regulator, Portland cement (PC), polyaluminum chloride (PAC), and calcium chloride as the main raw materials of the solidification, and the water content stabilization formula in phosphogypsum as the reaction medium. The results showed that CCS (0.5%), PC (0.4%), and PAC (0.3%) have a more significant hardening effect on phosphorus (P) and fluoride (F − ), which makes it possible to obtain materials and fillers based on phosphogypsum with low economic costs.…”