Abstract: The wastewater in iron pyrite exploitation contains lots of iron (with low acidity) and has a potential harm to environment. The treatment and utilization of iron pyrite wastewater is meaningful for environment protection. Thus，the preparation of black iron pigment from iron pyrite wastewater were explored with a wet oxidation precipitation method through regulating the pH of the original reaction solution (7—12)，reaction temperature (70—95℃)，reaction time (1—4.5h) and the stirring rate (50—250 r/min). Black iron pigment with high quality was obtained at the conditions of pH 9.5，temperature 85℃，reaction time 2.5h and stirring rate 150 r/min. XRD and SEM analysis showed that the particle size of the prepared black iron pigment is about 60nm，and Fe3O4 content is higher than 95%. The product can reach the requirements for the first-grade standard in black iron pigment industry.

摘要： 采用湿法氧化沉淀法，通过调节反应溶液初始pH值（7～12）、反应温度（70～95 ℃）、反应时间（1～4.5 h）和搅拌速度（50～250 r/min），探索了硫铁矿废水制备铁黑颜料的工艺条件。结果表明：在pH值为9.5、反应温度为85 ℃、反应时间为2.5 h、搅拌速度为150 r/min的条件下，能制备得到较优的铁黑颜料。其经XRD、SEM及铁黑颜料技术指标检测分析，表明该铁黑颜料粒径在60 nm左右，Fe3O4含量在95%以上，各项指标均能达到氧化铁黑颜料行业标准中一级品的要求。