连续式泡沫浮选分离青黛的研究

Separation of Indigo Naturalis by foam flotation technique in a continuous mode

目的研究连续式泡沫浮选分离青黛最佳工艺条件。方法以青黛中靛蓝质量分数和回收率为指标,对捕收区高度、泡沫层高度、冲洗水速率、给料速率、充气速率进行了单因素考察,研究其对连续式泡沫浮选青黛的影响效果并优化其工艺参数。结果捕收区高度为1.5 m,泡沫层高度为30 cm,给料速率为0.1 cm/s,冲洗水速率为0.01cm/s,充气速率为1.5 cm/s,在此条件下青黛浮选回收率可达75%以上,靛蓝质量分数在5.0%以上。结论连续式泡沫浮选分离青黛工艺稳定可行,为中试放大提供了一定依据。

To study the process of foam flotation in separation of Indigo Naturalis in acontinuous mode and to optimize the operational conditions. Methods Taking content and rate of recovery rate of indigo as index to investigate the single factors, such as the height of collecting region, the height of froth layer, flushing water rate, delivery rate, air flow rate, and aerating velocity, to study the effect of continuous foam floatation on Indigo Naturalis, and to optimize the process conditions finally. ResultsThe flotation performance is good when the height of collecting region is 1.5 m, the height of froth layer is 30 cm, the delivery rate is 0.1 cm/s, the flushing water rate is 0. 01 cm/s, the aerating velocity is 1.5 cm/ s. The recovery rate of indigo is more than 75% and indgo content is over 5.0%. Conclusion Foam flotation technique is stable and can be used to the separation of Indigo Naturalis in a continuous mode. And this study is the foundation of semi-works production of Indigo Naturalis.