深井开采膏体充填管线磨损机理研究

会泽铅锌矿开采深度超过1 000 m,属深井开采。主要采用膏体充填处理采空区,由于长时间膏体料浆摩擦管壁,管线磨损严重甚至磨穿管壁,导致部分浆液外淤,管道卸压会导致堵管事故的发生,堵管次数随着管线的磨蚀呈上升趋势。通过研究发现,影响管线磨损的因素包括固体颗粒粒级组成、形状、浆体的性质、粘度、流速及管材质量等。在充填过程中,通过对提高膏体浓度、增加管线输送阻力和改变尾砂粒级组成等进行分析,结合现场实验,提出了合理解决管线磨损和延长管线寿命的一系列措施,取得了较好的效果。

Study on Wear Mechanism of Paste Backfilling Pipeline in Deep Mining

The mining depth of Huize lead ＆zinc ore deposit is more than 1 000 m, it belongs to deep mining. The goaf is main ly treated by paste backfilling; the tube wall has been severe worn, even wore out, due to the friction of pipe wall by paste slurry for a long time, which give rise to external silting of partial slurry, so that pressure relief of pipeline can generate pipe blockage, the times of pipe blockage showed an increasing tendency following with the abrasion of pipeline. The research results showed that the influencing factor of pipeline abrasion includes： the particle size compositions of solid particle, shape, the property, viscosity, flow velocity of slurry and tube quality, etc. According to the analysis of paste concentration increasing, pipeline transport resistance increasing and changing of tailings＇ size fraction composition, etc. and combining with the field experiment, a series measures is proposed to rationally solve the problems of pipe line abrasion and lengthen the service life of pipeline, and good effect is obtained.