METODE DAN BAHAN PENGISIAN KEKUATAN AWAL YANG TINGGI DAN PENGENDAPAN CEPAT DENSITAS PULP YANG TINGGI

摘要

This invention discloses a high pulp density, fast setting and high early strengthbackfill method for underground mining, in which novel binding materials, with highearly strength properties, are used as the binding reagent, where mine tailings, naturalsands, ground sands and industrial waste materials are used as aggregate. The bindingmaterial, aggregate and water are mixed together uniformly to produce a high pulpdensity backfill slurry with 65 - 85% pulp densities. The backfill slurry produced istransported to underground mining stopes through a pipeline by gravity or pumping.Once the backfill slurry fills the stope, it quickly solidifies within several hours intoa solid backfill body with high early strength. One obvious advantage of the presentinvention, compared with the traditional backfill methods using Portland cement asbinding material, is that one tonne of the novel material obtains the same compressivestrength as threes tonnes of Portland cement as binding material. Another importantproperty of the present backfill materials and methods is that the curing time for thebackfill body will be decreased from 7 - 28 days to 1 - 3 days, which can significantlydecrease the operation cycle time for underground mining and increase efficiency.Because of the very good early strength and homogeneous backfill body, betterworking conditions and improved safety in mining operations are achieved. Further,because of the large amount of mine tailing being used as aggregates withoutclassification, the surface pollution in mines is decreased. The new methods disclosedin this invention may be combined with various mining methods to form upwardbackfill, downward backfill, partial backfill, complete backfill and other types ofbackfill, to be used in diverse mining conditions.