Experimental Study on Defoaming of Flotation Concentrate with Different Defoamers and Their Effect on Flotation
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摘要:
为了解决稳定的浮选精煤泡沫给精煤的储存、转运和脱水带来的系列工业生产问题, 进行了硅油消泡剂(G)和乳化烃类油消泡剂(R)对浮选精煤泡沫的消泡试验, 考察了消泡剂的添加方式和用量对浮选精煤消泡效果的影响, 以及消泡剂残留于循环水对浮选流程的影响。结果表明, 消泡剂以喷淋方式加入更能有效增加消泡速率和消泡程度; 随着消泡剂用量的增加, 消泡效果越好, 且硅油消泡剂优于乳化烃类油消泡剂; 循环水中较低用量消泡剂的残留对浮选影响较小, 当残留量较大时, 硅油消泡剂降低了浮选选择性, 抑制了浮选, 而乳化烃类油消泡剂有利于浮选。综合考虑, 建议使用低用量的乳化烃类油消泡剂, 以喷淋方式对浮选精煤进行消泡。
Abstract:In order to solve a series of industrial production problems of storage, transport and dehydration of coal flotation concentrate caused by the strong stability of their foam, the defoaming experiments of silicone defoamer (G) and emulsified hydrocarbon oil defoamer (R) for flotation concentrate were studied to revel the effect of the adding method and dosage of defoamer on the defoaming results. In addition, the effect of residual defoamer in circulating water on flotation process was revealed by the flotation test. The results showed that the rate and degree of defoaming can be increased more effectively by defoamers added in the way of spraying. The defoaming property is better with the increase of the dosage of defoamers and the silicone defoamer is superior to emulsified hydrocarbon oil defoamer. A low amount of defoamer in circulating water has little effect on flotation. When the residual amount increasing, silicone oil defoaming agent reduces flotation selectivity and inhibits flotation, while emulsified hydrocarbon oil defoamer can promote it. It is suggested that the flotation concentrate should be defoamed with low dosage emulsified hydrocarbon oil by spraying.
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Key words:
- flotation concentrate of coal /
- defoaming /
- defoamer /
- spray /
- recycled water /
- flotation
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图 2 消泡剂不同加入方式下泡沫层高度随时间的变化(ZJ：静置；DJ：以滴加方式加入消泡剂；PL：以喷淋方式加入消泡剂；G：硅油消泡剂；R：乳化烃类油消泡剂；20 ∶ 20 mg/L的消泡剂；100 ∶ 100 mg/L的消泡剂)
Figure 2.
图 3 不同消泡剂种类和用量下泡沫层高度随时间变化图(PL：以喷淋方式加入消泡剂；G：硅油消泡剂；R：乳化烃类油消泡剂；0：无消泡剂，仅喷淋水；20 ∶ 20 mg/L的消泡剂；100 ∶ 100 mg/L的消泡剂)
Figure 3.
表 1 不同条件下的消泡率
Table 1. Defoaming rate under different conditions
条件 PL-0 PL-G-20 PL-G-100 PL-R-20 PL-R-100 消泡率/% 12.73 35.45 59.09 28.18 42.73 注：条件同图 3；消泡率——被消除泡沫层高度占原泡沫层高度百分比。 
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表 2 浮选结果
Table 2. Flotation results
消泡剂种类 消泡剂用量/(L·mg-1) 尾煤 精煤 精煤可燃体
回收率/%质量/g 产率/% Aad/% 质量/g 产率/% Aad/% / / 196.1 68.61 73.54 89.7 31.39 14.81 59.56 G 10 194.4 67.90 72.75 91.9 32.10 13.26 60.08 R 10 185.5 64.95 71.54 100.1 35.05 16.45 61.30 G 100 252.0 89.58 57.91 29.3 10.42 18.73 18.33 R 100 160.1 58.13 80.90 115.3 41.87 18.63 75.42
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