单体多级浮选槽浮选时浆中各组分的流失研究

Components Removal in Multi Stages' Single-cell Flotation Deinking

研究了单体多级浮选槽浮选时各组分(如油墨、长纤维、短纤维、细小纤维和无机物等)的去除或流失情况及操作参数(如转子转速、添加皂与否以及浆料浓度)对这些组分去除或流失的影响。结果表明,添加皂的浮选对油墨的脱墨选择性很好。浮选后纸浆得率的下降主要是由于灰分和细小纤维的流失。灰分的流失与转子转速和是否添加皂无关,但增加浆浓会增加灰分的流失;细小纤维的流失则与转子转速的下降和浆浓的增加有关。

In addition to ink removal, valuable materials, such as fibers and minerals will be lost in flotation deinking, which lowers yield and thus decreases the profitability of the process. The removal or loss of ink, ash, long and short fibers and fiber fines from multi stages＇ single-cell flotation was introduced in this paper. The effect of operational parameters, such as rotor speed, soap addition and flotation consistency on the removal selectivity of each component was also discussed. The results showed that the removal selectivity of ink is very good, and by adding soap just before flotation, the removal selectivity even can be improved. The removal selectivity of ash, long and short fibers and fiber fines is considerably lower than that of ink. The flotation yield reduction is mainly caused by the loss of ash and fiber fines. The ash removal selectivity is practically independent of the rotor speed or soap addition. But increasing pulp consistency will increase the removal of ash. The removal of fiber fines will be related to the decreasing of rotor speed and increasing of pulp consistency.