摘要
河南某钼精选尾矿粒度微细,-23 μm粒级占 65%,其中Cu和Mo品位分别为 0.20%和 0.08%,具有一定的回收价值.作者前期通过在丙烯酰胺上引入疏水单体——十二烷基葡萄苷,合成了具有较好疏水性的PADD絮凝剂,并将其用于该钼精选尾矿中微细粒铜钼硫化矿的选择性絮凝浮选回收工艺.研究结果表明,在粗选矿浆pH为 4.2、六偏磷酸钠用量 500 g/t、PADD用量 100 g/t、硫酸铜用量 100 g/t、煤油用量 75 g/t、乙硫氨酯用量 75 g/t和 2 号油用量 40 g/t的条件下,经过一次粗选、一次扫选和两次精选、中矿合并返回至粗选的闭路试验流程,获得了铜品位 12.054%、铜回收率 89.98%、钼品位 3.214%、钼回收率 64.20%的铜钼混合精矿,有效地实现了钼精选尾矿中有价金属铜和钼的综合回收.基于较强的疏水性,PADD主要通过疏水作用力与微细粒铜钼硫化矿发生选择性絮凝作用,从而显著提高钼精选尾矿中微细粒铜钼硫化矿选择性絮凝浮选效果.
Abstract
The granularity of a molybdenum cleaner tailings from Henan Province was fine,with-23 μm grade accounting for 65％.The Cu and Mo grades of the tailings were 0.20％and 0.08％,respectively,which had a certain recovery value.PADD flocculant was synthesized by introducing hydrophobic monomer-dodecyl gluconide on acrylamide,which had a good hydrophobicity.In the work,PADD was used as flocculant to recovery fine Cu-Mo sulfide ore from the molybdenum cleaner tailings via selective flocculation flotation.Under the conditions of pulp pH 4.2,the dosages of sodium hempetaphosphate,PADD,cupric sulfate,kerosene,ethylthiamine and 2#oil were 500 g/t,150 g/t,100 g/t,170 g/t,151 g/t and 60 g/t,respectively,the closed circuit of once roughing flotation,once scavenging flotation,twice cleaning flotation,and the middles Ⅰ,Ⅱ and Ⅲ were combined return to the roughing flotation were performed.The obtained final mixed concentrate had the Cu grade of 12.054％,Cu recovery of 89.98％,Mo grade of 3.214％,and Mo recovery of 64.20％,which efficiently comprehensive recovered the valuable Cu and Mo from the molybdenum cleaner tailings.Based on the strong hydrophobicity,PADD selectively flocculated micro-fine copper molybdenum sulfide ore mainly through the hydrophobic force,and then significantly improved the selective flocculation flotation effect of micro-fine copper molybdenum sulfide ore in molybdenum tailings.
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