摘要
为了强化微细粒尾矿的沉降,以d90约为20μm的微细粒难沉降尾矿为试验对象,研究了絮凝剂的种类、分子量、用量等对微细粒铁尾矿沉降性能的影响,探讨了微细粒尾矿沉降的最佳絮凝剂药剂制度。结果表明：阴离子型、阳离子型和非离子型有机高分子絮凝剂对微细粒尾矿的沉降较自然沉降时均是有利的,在絮凝剂用量为50 g/t时,用阳离子型聚丙烯酰胺时尾矿的沉降速度是其他两种类型絮凝剂的5~7倍;尾矿的沉降速度随阳离子型絮凝剂分子量的增大先增大后减小,在分子量达到1 100万时,沉降速度达到最大,为5.60cm/min;压缩区浓度随着阳离子型絮凝剂分子量的增大逐渐增大,但是增加量不大;尾矿的沉降速度随阳离子型絮凝剂用量的增加先增大后减小,当用量达到50 g/t时,微细粒尾矿的沉降速度达到最大值,为5.60 cm/min;压缩区浓度随着阳离子型絮凝剂用量的增加而逐渐降低。综合分析得到最佳的药剂制度为：分子量为1 100万的阳离子型絮凝剂BSF8140,用量为50 g/t。
In order to strengthen the sedimentation of micro-fine tailings,the effects of type,molecular weight and dosage of flocculants on the sedimentation characteristics of micro-fine iron ore tailings with d90= 20 μm were studied,as well as the optimal reagent system for fine tailings sedimentation was selected. The results showed that anionic,cationic and non-ionic organic polymer flocculants are all favorable to the settlement of micro-fine tailings. When agent consumption was 50 g / t,the settling rate of tailings treated with cationic polyacrylamide was 5-7 times of those treated with other two types of flocculants. With the increases of molecular weights of cationic flocculants,tailings settling velocity increased first and then decreased. The maximum settling velocity of 5. 60 cm / min was obtained when the molecular weight of cationic flocculants reached 11 million. Compression zone concentration had a slight increase with the increases of molecular weight of cationic flocculants. With the increases of dosages of cationic flocculants,tailings settling velocity increased first and then decreased as well. And the maximum settling velocity of 5. 60 cm / min was achieved at a dosage of 50 g / t. While the compression zone concentration was gradually reduced. Based on the comprehensive analysis,the optimum reagent system,50 g / t cationic coagulant BSF8140 with a molecular weight of 11 million,was determined.
出处
《矿产保护与利用》
北大核心
2015年第6期59-64,共6页
Conservation and Utilization of Mineral Resources
基金
教育部新世纪优秀人才支持计划资助项目(NCET-12-0962)
关键词
铁矿
微细粒尾矿
絮凝剂
沉降速度
压缩区浓度
iron ore
micro-fine tailings
flocculant
settling velocity
compression zone concentration
