粗颗粒煤泥易于脱附是限制粗颗粒煤泥浮选的主要因素,为了探究粗颗粒煤泥在柱体内轴向的脱附规律,运用一种可在浮选柱给料口上方不同轴向位置添加上升水流的自制流化床浮选柱使浮选柱给料口以上的上升水流表观流速大于粗颗粒粒群的最大沉降末速,从而将经气泡携带至给料口以上的粗颗粒带入泡沫产品,减少在给料口以上因粗颗粒脱附而引起的精煤损失。研究结果表明,难浮粗煤粒在柱体轴向的脱附率和柱体轴向高度之间成线性关系,且界面脱附约占总脱附率的40%,从而证明难浮粗颗粒的主要浮选缺陷是脱附概率大,通过在给料口以上添加上升水流或者降低给料口以上柱体高度可有效实现难浮粗颗粒的浮选。

The easy detachment of coarse coal particle is the main factor that restricts the flotation of hard-to-float coarse particle slime. In order to explore the axial detachment law of hard-to-float coarse particle in the cylinder,using a homemade fluidized bed flotation column with an increased water flow at different axial positions above the flotation column feed opening,the apparent flow rate of the ascending water flow above the feed inlet of the flotation column was made to be greater than that of the coarse particle coal slime maximum settlement of the final velocity. Thereby,the coarse-grained slime was carried by the bubbles to the feedstock port into the foam product to reduce the loss of clean coal caused by coarse particles detachment above the feedstock port. The results show a linear relationship between the desorption rate of the hard-to-float coarse coal particles in the axial direction of the cylinder and the axial height of the cylinder,and the interface detachment accounts for approximately 40% of the total detachment rate,which proves that the flotation defects of difficult flotation particles are mainly due to large detachment probability. Flotation of difficult flotation particles can be effectively achieved by rising water flow above the feed inlet or lowering the column height a- bove the feed inlet.