尾矿回填用新型固废基胶结材料试验研究

Experimental study on new solid waste base cementing material for tailings backfill

本文以工业固废氟石膏和矿渣粉为主要原材料制备新型固废基胶结材料,探究了不同氟石膏和矿渣粉掺量对新型固废基胶结材料力学性能的影响。在此基础上,研究了采用新型固废基胶结材料不同浓度尾矿浆和不同比例的灰砂比对尾矿胶结体的性能影响。相同条件下,随着尾矿浆质量浓度的提高,尾矿胶结体的各龄期抗压强度均逐渐提高。灰砂比是影响尾矿胶结体抗压强度的最重要因素,灰砂比越高,尾矿胶结体抗压强度越高。研究表明:新型固废基胶结材料最佳比例为:15%氟石膏、75%矿渣粉、10%水泥、0.6%复合激发剂,推荐采用1∶8灰砂比,70%浓度尾矿浆固结尾矿进行矿山回填。可以有效消纳工业固废和尾矿砂,在满足矿山回填性能要求的同时降低矿山回填成本,并对尾矿回填固废资源综合利用具有一定的指导作用。

This article uses industrial solid waste fluoride gypsum and slag powder as the main raw materials to prepare a new type of solid waste-based cementitious materials,and explores the influence of different amounts of fluoride gypsum and slag powder on the mechanical properties of the new solid waste-based cementitious materials.Furthermore,based on this,the influence of different concentrations of tailings slurry and different proportions of lime-sand ratio on the performance of tailings cementitious materials using new solid waste-based cementitious materials was studied.Under the same conditions,as the concentration of tailings slurry increases,the compressive strength of the tailings cementitious bodies at all curing ages gradually rises.The ash-to-sand ratio emerges as the most significant factor influencing the compressive strength of tailings cementitious bodies,with a higher ratio correlating to greater compressive strength.Research indicates that the optimal composition for the new solid waste-based cementitious materials comprises 15%fluorogypsum,75%slag powder,10%cement,and 0.6%composite activator.It is advisable to adopt an ash-to-sand ratio of 1:8 and utilize a 70%concentration of tailings slurry to solidify tailings for mine backfilling.This approach effectively consumes industrial solid waste and tailings sand,lowers the cost of mine backfilling while fulfilling its performance requirements,and offers guidance for the comprehensive utilization of tailings backfilling solid waste resources.