泥层高度对细粒全尾浓密规律的影响

 深锥浓密机是膏体制备的关键设备,而泥层高度影响着浓密机内部料浆沉降速度和压密浓度。通过量筒静态沉降试验发现,扰动区料浆沉降速度最快,无明显规律；沉降区料浆高度越高,沉降速度越快；压密区为匀速沉降。采用动态搅拌装置,对不同泥层高度料浆浓密规律进行探究。结果表明,当泥层高度一定时,料浆浓度的变化速率随着压密时间的增加而逐渐减小,6h内料浆浓度变化最快,压密效率最高,当压密时间达到12h时,极限质量分数变化很小；在相同压密时间下,不同泥层高度下料浆极限质量分数范围为71.23%—74.43%。经分析,该料浆质量分数达到70%以上时,极限质量分数值与高径比呈线性正相关。因此,泥层高度是影响底流浓度大小的一个重要因素。

Influence of Mud Height on the Concentrastion of the Fine Tailing

The deep cone thickener is the key equipment for paste manufacture, and the mud height influences the slurry setting velocity and the thickening density in the thickener. The cylinder's static test shows that the settlement velocity of the slurry is the fastest in the disturbance area and without obvious law; the greater the initial height of the slurry, the larger its setting velocity in the setting area; a uniform settlement velocity is found in the compaction area. The concentration of the tailing with different mud heights is studied by the dynamic mixing facility. The results show that, when the mud height is fixed, the rate of the slurry concentration change is gradually reduced as the compaction time is increased. The rate of the slurry concentration change is the highest within 6h. When the compaction time is up to 12h, the rate of the limit concentration change is very small. The limit mass fraction of different mud heights is 71.23%—74.43% at the same compaction time. The analysis shows that when the limit mass fraction of tailings is above 70%, the limit concentration and the height to diameter ratio have a linear relationship. Therefore, the mud height is an important factor which affects the underflow concentration.