废石尾砂胶结充填材料流动与强度性能的研究

Study on flow and strength properties of cemented filling material with waste rock-tailings

为了解决极细全尾砂作为充填骨料制备充填料浆脱水困难、充填体强度偏低的问题,通过开展废石尾砂胶结充填试验,改善充填骨料粒级组成,研究废石掺量对充填料浆流动性能及充填体强度的影响规律。结果表明:相比较全尾砂胶结充填,掺入废石可以显著改善充填料浆的流动性能,提高充填料浆的输送浓度;在相同灰砂比和浓度情况下,废石尾砂胶结充填体强度高于全尾砂胶结充填体。因此,废石尾砂胶结充填体可以降低灰砂比,减少水泥用量,消纳地表废石。在云南金厂河矿山开展工业试验,确定了充填参数为浓度80%、灰砂比1∶8、废石掺量60%,原位取芯平均抗压强度为3.36 MPa,满足采场充填体强度设计要求。

To solve the problem of dewatering difficulty and low strength of backfill causing by the extremely fine unclassified tailings when tailings were used for cemented backfill preparation.Through the cemented filling test of waste rock-tailings,the particle size composition of filling aggregate was improved,and the influence of waste rock content on the flow and strength performance of filling material was studied.The results showed that compared with unclassified tailings cemented backfill,adding waste rock could significantly improve the flow performance of filling slurry and increase the conveying concentration.At the same cement-tailing ratio and slurry concentration,the strength of waste rock cemented backfill was higher than that of unclassified tailings cemented backfill.Therefore,the cement-tailing ratio and cement consumption was reduced and the surface waste rock was absorbed by waste rock cemented backfill.The industrial test was carried out in Jinchanghe mine of Yunnan province.The filling parameters were determined,with 80%of the slurry concentration,1∶8 of the cement-tailing ratio,and 60%of the waste rock content.The average compressive strength of in-situ coring was 3.36 MPa,which met the design strength requirements of stope backfill.