新型固化剂对铜矿全尾砂充填体抗压强度的影响

Influence of New Curing Agent on Unconfined Compressive Strength of New Unclassified Tailings Cemented Materials in Copper Mine

针对铜矿全尾砂颗粒细及胶结充填成本高问题,进行了新型固化剂对铜矿全尾砂充填抗压强度影响的研究。研究结果表明:当充填总浓度分别为65%、68%、70%,灰砂比为1∶8时,使用新型固化剂试块的28 d抗压强度达到2.556、3.333、3.842 MPa,比使用水泥时提高了650%、520%、461%;当总浓度为70%,灰砂比为1∶8,养护龄期为3、7、28 d时,使用新型固化剂试块的强度分别为1.454、2.983、3.842 MPa,比使用水泥提高了516%、665%、461%;当总浓度为70%,养护龄期为28 d,灰砂比为1∶10、1∶9、1∶8时,使用新型固化剂试块的分别为2.076、2.738、3.842 MPa,比使用水泥时提高了382%、449%、461%。该新型固化剂满足矿山生产要求,克服了水泥全尾砂充填体强度低及充填成本高等技术难题。

Aimed at the problems of fine grain size of unclassified tailing and high costs of consolidation and backfill,the influences of the new curing agent to unconfined compressive strength of unclassified tailings cemented materials are studied.The study results show that：when the solid concentration are 65 %,68 %,70 % respectively and the cement sand ratio is 1 ∶ 8,the compressive strength of the new curing agent samples cured for 28 d are 2. 556,3. 3333. 842 MPa respectively,the compressive strength of the samples suing new curing agent are increased 650 %,520 %,461 % than that of the cement samples;when the solid concentration is 70 %,the cement sand ratio is 1 ∶ 10 and the curing age are 3,7,28 d,the compressive strength of the new curing agent samples are 1 454,2. 983,3. 842 MPa,the compressive strength of the samples using new curing agent are increased 516 % 、665 % 、461 % than that of the cement samples;when the the solid concentration is 70 %,the curing age is28 d and the cement ratio are 1 ∶ 10,1 ∶ 9,1 ∶ 8,the compressive strength of the new curing agent samples are 2. 076,2. 738,3. 842 MPa,the compressive strength of the samples using new curing agent samples are increased 382 %,449 %,461 % than that of the cement samples. The new type of curing agent can meet the mine backfilling materials requirements,besides that,the deficiencies of low strength and high costs of the unclassified tailings cemented materials are also overcomed by adopting the new type of curing agent.