粉煤灰/聚合硫酸铁复合材料处理炼钢连铸冷却喷淋水

炼钢连铸冷却喷淋水中的高含油量易形成黏性油泥团，堵塞管道和设备，导致处理后的水难以达到回用水质的要求，除油降浊是其处理稳定达标的关键环节。为了寻求对连铸含油冷却喷淋水处理工艺简单、投资少、费用低、效率高的絮凝/吸附处理工艺及方法，实验制备了粉煤灰/聚合硫酸铁复合材料（PFA），表征了其结构、形貌，研究了其除油降浊的最佳pH值、反应温度、最佳配比、最佳投加量等，并从处理效率、投药成本、除浊率等方面考虑，确定最佳运行条件：pH为7~8，反应温度为50℃，搅拌300 r·min-1左右，反应3 min，静置10 min，粉煤灰/聚合硫酸铁的配比为100：8~100：18，投加量为80~220 mg·L-1。处理后水样含油浓度为低于5 mg·L-1、循环水处理成本低于0.1元·（t水）-1，除浊率为89.5%，满足实际生产使用要求，达到炼钢废水循环利用的目的。

Treatment of cooling spray water from steelmaking and continuous casting by FA/PFS composite materials

It is easy for high oil content sludge in steelmaking and continuous casting cooling spray water to form an oily sticky conglomerate that clogs pipes and equipment, affecting the water quality of the effluent significantly. Removing the oil and reducing the turbidity are key to meeting compliance standards. To improve and achieve simple, low investment, low cost, and high efficiency flocculation/adsorption processes and methods, experiments with FA/PFS (PFA) composite materials were performed to characterize their structure and morphology and determine the optimum pH, temperature, best ratio of components, optimal dosage, etc. for treatment. In addition, the best operating conditions were determined as follows in terms of processing efficiency, administrative costs, turbidity removal rate, and other factors:pH of 7~8, reaction temperature of 50℃, stirring of approximately 300 r·mim-1, reaction time of 3 min, standing time of 10 min, FA/PFS ratio of 100:8~100:18, and dosage of 80-220 mg·L-1. The oil concentration of the treated water sample was less than 5 mg·L-1, the cost of the circulating wastewater treatment was less than 0.1 RMB/tons of water, and the turbidity removal rate was 89.5%, which met the requirements of actual production, and accomplished the aim of steel waste recycling.