高效减水剂对含盐卤充填料浆输送特性的影响

摘要

With the special geological and hydrological conditions of Sanshandao gold mine,there were large amounts of bittern ions in backfill mixing water according to the test results,which has an adverse effect in slurry gravity transportation. The possibility of using superplasticizer to improve slurry transportation properties was explored in this paper to realize high concentration gravity transportation. The backfill slurry was prepared with using classified tailings,backfill water,cement and adding different kinds and amounts of superplasticizer. The slurry settling and bleeding rates were tested by standing in the measuring cylinder. And the rheological properties were tested by using R/S-SST rheometer. The influence law of superplastici-zer on slurry settling and rheological properties were revealed by comparative analysis. The results showed:The slurry mixed with 0. 5‰ naphthalene superplasticizer suffered the largest decline in bleeding rates. And it provided an effective way of re-ducing stope dewatering pressure;The slurries with 0. 5‰ naphthalene superplasticizer admixture under high cement-tailings ratio condition and 0. 5‰polycarboxylene superplasticizer admixture under low cement-tailings ratio condition suffered the lar-gest decline in settling rates;The rheological property of backfill slurry contained bittern can be represented as Bingham flow pattern. The best transport efficiency could be achieved by mixing 0. 5‰ polycarboxylene superplasticizer when the slurry vis-cosity and yield stress both showed relatively low values. In conclusion,the suspension of backfill slurry contained bittern could be enhanced by superplasticizer. And the slurry viscosity and yield stress were both effectively reduced. Thus the pipe wall ab-rasion was decreased.%三山岛金矿地质水文条件特殊,测得充填用水中富含盐卤离子,对料浆自流输送造成不利影响。本研究探索使用高效减水剂改善含盐卤料浆的输送特性,以实现高浓度自流输送。以分级尾砂、充填用水、水泥为原料,掺入不同类型、掺量的高效减水剂制备充填料浆,在量筒中静置并测试沉降速率和泌水率,使用R/S-SST流变仪测试流变特性。通过对比分析揭示出减水剂影响料浆沉降及流变特性的规律,得出结论：掺入0．5‰萘系减水剂料浆泌水率降幅最大,能够有效降低采场脱水压力；高灰砂比情况下掺入0．5‰萘系减水剂、低灰砂比情况下掺入0．5‰聚羧酸盐系减水剂,料浆沉降速率降幅最大；含盐卤充填料浆流变特性可用Bingham流型表征,0．5‰聚羧酸盐系减水剂掺量的料浆黏度系数和屈服应力均较低,输送效果最佳。减水剂能够增强含盐卤充填料浆的悬浮性,有效降低料浆黏度系数及屈服应力,减少管壁磨损。