酸浸钢渣制备磁性絮凝剂及其在油田废水处理中的应用
Preparation of Magnetic Flocculant from Acid-Leached Steel Slag and Its Application in Oilfield Wastewater Treatment
蒋成银 1孟海龙 1蒋崇珊 1杨建兴 1李桂菊 2张陈德 2王思远2
作者信息
- 1. 中国石油长庆油田分公司第三采气厂,中国 乌审旗 017300
- 2. 天津科技大学海洋与环境学院,中国 天津 300457
- 折叠
摘要
通过酸浸法处理炼钢厂废料,经过水解和聚合反应制成一种磁性絮凝剂,可实现资源再利用.X射线衍射分析显示,该絮凝剂主要成分是γ-Fe2O3,红外谱图和Zeta电位分析证实其为无机高分子混凝剂,其主要絮凝机理为吸附电中和.研究发现,制备过程中熟化时间对铁离子形态转化有显著影响,经过 5 天熟化制备的产品中Fe(b)含量最高,絮凝效果最佳.在应用实验中以长庆油田苏里格气田采出液为研究对象,该絮凝剂的适用pH范围为7～11,最佳投加量为 0.3～0.4 g/L.实验结果显示,该絮凝剂使浊度去除率高达 99％以上,COD去除率达 64％以上.与市场上常用的聚合氯化铝相比,其沉降速度更快,下层絮体体积更小,性能优异,应用前景广阔.
Abstract
In this contribution,the steelworks waste underwent acid leaching to be hydrolyzed and polymerized into a magnetic flocculant,thereby achieving resource recycling.X-ray diffraction analysis revealed that the received flocculant primarily consisted of γ-Fe2O3.Furthermore,infrared spectroscopy and Zeta potential char-acterizations indicated that it was an inorganic polymer flocculant,with the main flocculation mechanism being ad-sorption and electric neutralization.It was found that the maturation time had a significant impact on the transforma-tion of iron ion.The product obtained after 5 days of maturation exhibited the highest Fe(b)content,signifying the most effective coagulation component and optimal coagulation effect.Application experiments conducted on the pro-duced liquid of Sulige gas field from Changqing oilfield demonstrated that the coagulant was effective within a pH range of 7～11,with an optimal dosage of 0.3～0.4 g/L.Under these conditions,the turbidity removal rate excee-ded 99％,and the COD removal rate surpassed 64％.In comparison to the commonly used PAC in the market,this coagulant boasted several outstanding features,including a faster sedimentation rate and a smaller volume of settled flocs,indicating its extensive range of application prospects.
关键词
磁性絮凝剂/资源再用/沉降性能/油田废水Key words
magnetic flocculant/resource reuse/settling performance/oilfield wastewater引用本文复制引用
基金项目
国家自然科学基金资助项目(22276135)
中国石油长庆油田公司科学研究与技术开发项目(2023-15543)()
出版年
2024
NETL
NSTL
万方数据