Abstract：
Iron phosphate-based coating and iron silicate-based coating were used to inhibit the oxidation of sulfide minerals in rainy and submerged environments. The inhibiting effectiveness of coating agents on the oxidation of iron sulfide minerals was investigated using pyrite and rock samples resulting from acid drainage. The film formed with both surface-coating agents was identified by pyrite surface analysis. It was also confirmed that the formation of coatings varies depending on the crystallographic orientation. The inhibitory effects under rainy and submerged conditions were investigated using column experiments. Submerged conditions accelerated deterioration compared to that under rainy conditions. Iron phosphate coating had a significantly better oxidation-inhibitory effect (84.86-98.70%) than iron silicate coating (56.80-92.36%), and at a concentration of 300 mM, H+ elution was inhibited by more than 90% throughout the experiment. Furthermore, methods for effective film formation were investigated in terms of producing Fe3+; (1) application of coating agents mixed with oxidant (H2O2), (2) application of coating agent after the use of the oxidant. In a rainy environment, applying iron phosphate-based coating using the sequential method showed oxidation inhibition effects for cycles 1-9, whereas applying the mixed material showed effects for cycles 9-13. The use of a surface-coating agent after applying an oxidant did not inhibit oxidation. The surface coating agent and the oxidizing agent should be applied as a mixture to form a film.
摘要：
磷酸铁基涂层和硅酸铁基涂层用于抑制多雨和淹没环境中硫化物矿物的氧化。使用酸排水产生的黄铁矿和岩石样品研究了涂层剂对硫化铁矿物氧化的抑制作用。通过黄铁矿表面分析鉴定了用两种表面涂层剂形成的膜。还证实了涂层的形成根据结晶取向而变化。使用柱实验研究了在雨天和水下条件下的抑制作用。与多雨条件相比，淹没条件加速了恶化。磷酸铁涂层的氧化抑制效果(84.86-98.70%)明显优于硅酸铁涂层(56.80-92.36%),在300mM的浓度下，在整个实验中,H+洗脱被抑制超过90%。此外，在生产Fe3+方面研究了有效成膜的方法；（1）涂覆剂与氧化剂（H2O2）混合，(2)涂剂应用后再使用氧化剂。在多雨的环境中，使用顺序方法施加磷酸铁基涂层对循环1-9显示出氧化抑制作用,而施加混合材料对循环9-13显示出效果。在施加氧化剂之后使用表面涂层剂不会抑制氧化。表面涂层剂和氧化剂应作为混合物施加以形成膜。
