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金属矿山 ›› 2016, Vol. 45 ›› Issue (10): 97-102.

• 矿物工程 • 上一篇    下一篇

聚丙烯酰胺对细粒赤铁矿沉降行为的影响

张进1,2,张芹1,2,胡陈强1,2,龙伟1,2,曾睿1,2,潘登1,2   

  1. 1.武汉科技大学资源与环境工程学院,湖北 武汉 430081;2.冶金矿产资源高效利用与造块湖北省重点实验室,湖北 武汉 430081
  • 出版日期:2016-10-15 发布日期:2016-11-04
  • 基金资助:

    基金项目:国家自然科学基金项目(编号:50974099)。

Effects of Polyacrylamide on Sedimentation Behavior of Fine-grained Hematite

Zhang Jin1,2,Zhang Qin1,2,Hu Chenqiang1,2,Long Wei1,2,Zeng Rui1,2,Pan Deng1,2   

  1. (1.College of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;2.Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resource,Wuhan 430081,China
  • Online:2016-10-15 Published:2016-11-04

摘要: 细粒铁精矿在浓缩过滤环节存在沉降速率慢,溢流固体悬浮物浓度高,精矿滤饼含水率高等问题。通过添加絮凝剂产生凝聚、桥连等作用使矿物颗粒形成絮团,可以促进细粒铁精矿沉降。以某赤铁矿精矿为研究对象,阴离子型、阳离子型、非离子型和两性聚丙烯酰胺为絮凝剂,通过沉降试验及赤铁矿表面ζ电位测定来考察聚丙烯酰胺对赤铁矿絮凝沉降行为的影响。结果表明:赤铁矿颗粒与絮凝药剂分子间相互作用方式主要包括静电力、氢键、范德华力、化学吸附等,而ζ电位在这一过程中是否起主要作用以及对这一过程是起促进或者弱化作用主要取决于絮凝剂使用种类、用量和矿浆pH值。试验结果为选择合适絮凝剂更好促进细粒铁精矿沉降提供了理论依据和指导。

关键词: 细粒赤铁矿精矿, 絮凝, 沉降率, &zeta, 电位

Abstract: Fine grained iron concentrate in concentrated filter link has problems of slow sedimentation rate,large overflow suspended solid value,high concentrate filter cake moisture content and so on.By adding flocculants,the mineral grains floccules based on cohesion and bridging function,which promotes the sedimentation of fine ore grain.A hematite concentrate were as research object,the anionic,cationic,nonionic and amphoteric polyacrylamide as the flocculating agents,through the sedimentation test and Zeta potential measurement to examine the effects of polyacrylamide on flocculation and sedimentation behavior of fine-grained hematite.Test results show that,the interactions between ore grain and flocculation drug molecules include electrostatic force and hydrogen bond,Van Der Waals force,chemical adsorption,and Zeta potential plays a main role in this process or not and promotes or weakens this process which mainly depends on the type,the dosage of flocculants and pH value of the slurry.It provides theoretical basis and guidance for adding flocculants to select appropriate flocculant to promote the settlement of fine iron concentrate.

Key words: Fine-grained hematite concentrate, Flocculation, Sedimentation rate, Zeta potential