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为了提高砂仓中尾砂浓密效率,实现高浓度的放砂,引入声场作为研究手段,创新性的利用声场辐射方式传播的特性,将声场非接触性地作用于尾砂浆介质中.通过设计试验,配制质量分数为40%的尾砂砂浆,在尾砂浆分别沉降15,20,25,30,35和40 min后,施加频率20 k Hz,功率50 W的超声波,探究不同沉降时间后施加超声波作用对最终沉降时间和浓度的影响,同时将超声波作用在砂仓放砂阶段,并对超声波作用后不同浓度的砂浆进行流变参数测定.试验结果表明:在沉降20 min后施加超声波,砂浆沉降浓密时间最短为80 min,尾砂浆最终质量分数可达77.5%,与此同时超声波作用下可以实现砂仓稳定高浓度的放砂,放出砂浆质量分数为74.04%.对比超声波处理前后砂浆黏度与屈服应力可知,超声波可有效降低砂浆黏度22.3%,具有良好的降黏效果.超声波的振动作用,空化作用以及声流效应是使得砂浆快速浓密沉降以及放出的原因.
In order to improve the dense efficiency of tailings sand and achieve high concentration of sand, the introduction of sound field as a research tool, innovative use of the characteristics of the propagation of sound field radiation, the sound field non-contact role in the tailing mortar media.Through design tests, The tailings mortar with mass fraction of 40% was prepared. After the tailings were respectively deposited for 15, 20, 25, 30, 35 and 40 min, ultrasonic waves with a frequency of 20 k Hz and a power of 50 W were applied to investigate the effects of ultrasonic wave after different settling times On the final settling time and concentration, and at the same time the role of ultrasonic in the sand bin in the sand stage, and different concentrations of mortar ultrasonic effect after the rheological parameters measured.The results show that: After the settlement of 20 min, ultrasonic wave applied, The shortest time is 80 min, the final mass fraction of tailings mortar can reach 77.5%, meanwhile, the stable and high concentration of sand can be achieved under the action of ultrasonic waves, the mass fraction of discharged mortar is 74.04% .Comparison of the viscosity and yield stress of mortar before and after ultrasonic treatment It can be seen that the ultrasonic can effectively reduce the mortar viscosity of 22.3%, with a good viscosity reduction effect of ultrasonic vibration, cavitation and sound effects is to make the mortar faster Thick and rapid settlement and the reasons for release.