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金属矿山 ›› 2020, Vol. 49 ›› Issue (07): 115-121.

• 矿物工程 • 上一篇    下一篇

有机-无机杂化改性聚丙烯酰胺絮凝性能研究

方子川,陶乐,赵婧琳,孙春宝,邹文杰   

  1. 1. 北京科技大学土木与资源工程学院,北京 100083;2. 中国有色金属工业协会,北京100083
  • 出版日期:2020-07-15 发布日期:2020-08-21
  • 基金资助:
    国家自然科学基金项目(编号:51604019),矿物加工科学与技术国家重点实验室开放基金项目(编号:BGRIMM-KJSKL-2017-19)。

Study on the Flocculation Performance of Organic-inorganic Hybrid Modified Polyacrylamide

Fang Zichuan,Tao Le,Zhao Jinglin,Sun Chunbao,Zou Wenjie   

  1. 1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. China Nonferrous Metals Industry Association, Beijing 100083, China
  • Online:2020-07-15 Published:2020-08-21

摘要: 为强化絮凝剂聚丙烯酰胺(PAM)的絮凝性能,在PAM分子链上引入无机阳离子胶体基团进行有机-无机杂化改性。采用水溶液原位聚合法合成有机-无机杂化改性氢氧化铝聚丙烯酰胺(Al(OH)3-PAM)和氢氧化镁聚丙烯酰胺(Mg(OH)2-PAM);通过红外光谱分析表征聚合物的结构,采用乌氏粘度计测定出两者的粘均分子量分别为270万、320万;以-0.038 μm的高岭土纯矿物为试验对象,通过沉降试验研究了所合成絮凝剂对高岭土的絮凝沉降性能。结果表明,当絮凝剂用量均为70 g/t时,Al(OH)3-PAM、Mg(OH)2-PAM的前10 s初始沉降速度分别为7.713 mm/s、11.181 mm/s,800万阳离子聚丙烯酰胺(CPAM)初始沉降速度为3.923 mm/s;Al(OH)3-PAM、Mg(OH)2-PAM作用下的絮团较CPAM产生的絮团小而密实;杂化改性聚丙烯酰胺絮凝性能显著优于CPAM及铝盐、镁盐分别与300万分子量阴离子PAM的复配絮凝剂,分子量高的Mg(OH)2-PAM絮凝沉降性能更佳。

关键词: 聚丙烯酰胺, 杂化改性, 絮凝沉降试验, 阳离子胶体基团

Abstract: In order to enhance the flocculation performance of polyacrylamide (PAM), the inorganic cationic colloid groups were grafted onto the PAM molecular chain for organic-inorganic hybrid modification. Hybrid modified aluminum hydroxide polyacrylamide (Al(OH)3-PAM) and magnesium hydroxide polyacrylamide (Mg(OH)2-PAM) were synthesized using in-situ polymerization of aqueous solution. The structure of hybrid modified PAM was analyzed and characterized by infrared spectroscopy. The viscosity average molecular weights of Al(OH)3-PAM and Mg(OH)2-PAM were determined to be 2.7 million and 3.2 million using the ubbelohde viscometer. The flocculation and sedimentation performance of the synthesized flocculant was studied by sedimentation test with the kaolin pure mineral of -0.038 μm. When the flocculant dosage is 70 g/t, the initial settling velocity in the first ten seconds of Al(OH)3-PAM and Mg(OH)2-PAM are 7.713 mm/s and 11.181 mm/s, respectively, while that of 8 million cationic polyacrylamide (CPAM) is only 3.923 mm/s. The flocs after the action of Al(OH)3-PAM and Mg(OH)2-PAM is smaller and denser than that produced by CPAM. The performance of hybrid modified polyacrylamide is significantly better than that of CPAM and aluminum salt-PAM as well as magnesium salt-PAM composite flocculant, and the hybrid modified polyacrylamide Mg(OH)2-PAM with higher molecular weight has better flocculation and sedimentation performance.

Key words: Polyacrylamide, Hybrid modification, Flocculation sedimentation test, Cationic colloid groups