Two−phase and Three−phase Froth Performance in Sphalerite Flotation Using Sulphidizing−amination Method
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摘要:
硫化—胺法是氧化锌的主要选别方法之一，在工业生产中的指标较好，但存在浮选泡沫发黏、难消泡的问题。研究了硫化−胺法浮选菱锌矿体系中两相泡沫和三相泡沫的性能，考察了硫化钠用量、十二胺用量、矿物含量、矿物粒度、矿物种类等对泡沫稳定性的影响，并测试了不同矿物含量的矿浆黏度。结果表明，在采用硫化—胺法浮选菱锌矿时，加入硫化钠能够提高两相和三相泡沫的稳定性。不同粒度的矿物颗粒对泡沫稳定性影响不同，加入−74+37 μm粒级的菱锌矿和石英颗粒均能够降低泡沫稳定性，而加入−37 μm粒级的菱锌矿和石英颗粒均能够提高泡沫稳定性，−18 μm的石英颗粒影响尤为明显。当十二胺与微细粒级石英共同存在时，浮选泡沫尤为稳定。加入石英颗粒后的三相泡沫半衰期均高于菱锌矿，这是由于石英矿浆的黏度高于菱锌矿，因而泡沫液膜的Marangoni效应增强，导致排液速率变慢，泡沫液膜变薄速率下降，泡沫稳定性更强。
Abstract:The sulphidizing−amination method is one of the main beneficiation methods for sphalerite ore, which has good indexes in industrial production, but there is a problem that the flotation foam is sticky and difficult to defoam. The performance of two−phase and three−phase foams in sphalerite flotation using sulphidizing−amination method, and the effects of sodium sulfide dosage, dodecylamine dosage, mineral content, mineral particle size, mineral type, etc. on foam stability were studied. The pulp viscosity of different mineral contents was investigated at last. The results show that in the sulphidizing−amination flotation of sphalerite, sodium sulfide can improve the stability of two−phase and three−phase foam. Mineral particles of different sizes have different effects on foam stability. Adding sphalerite and quartz particles with a particle size of −74+37 μm can reduce foam stability, while adding sphalerite and quartz particles with a particle size of −37 μm can improve foam stability. The −18 μm quartz particles have a particularly significant effect. When dodecylamine co−existed with micro−fine quartz, the flotation foam was particularly stable. The half−life of the three−phase foam after the addition of quartz particles is higher than that of sphalerite, because the viscosity of quartz pulp is higher than that of sphalerite, so the Marangoni effect of the foam film is enhanced, resulting in a slower drainage rate, a slower thinning rate of the foam film, and stronger foam stability.
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Key words:
- sulphidizing−amination flotation /
- DDA /
- sphalerite /
- sodium sulfide /
- quartz /
- half−life of froth
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