超细粒级浸出渣充填配比试验研究

为了探究超细粒级浸出渣与分级尾砂混合作为充填骨料的充填体强度能否达到凡口铅锌矿井下充填的要求,开展了浸出渣与分级尾砂的充填配比试验。通过充填配比试验,分析不同配比和质量分数的充填料浆的流动性和充填体强度特性。结果表明:质量分数对充填体强度的影响较大;灰砂比、质量分数越大,充填体的强度越高;在一定范围内,增加浸出渣的用量可提高充填体的强度;扩散度可以很好地反映充填料浆的流动性,充填料浆的流动性随质量分数增加而减小,当质量分数较高时增加水泥用量可提高充填料浆的流动性,增加浸出渣含量会导致充填料浆的流动性降低。根据凡口铅锌矿充填技术要求及室内充填配比试验结果,得出不同部位的最佳充填配比:矿房采场的最佳灰砂比、浸出渣与分级尾砂之比、质量分数分别为1∶6、1∶5、71%,间柱采场为1∶6、1∶6、69%,首层和浇面为1∶3、1∶6、71%。

Experimental study over the backfilling matching ratio of the super fine particles'leaching residue

The present paper takes it as its goal to make an exploration of the backfill strength of the super fine particles' leaching residue so as to satisfy the filling demands of the Fankou Leadzinc Mine by classifying the tailings into a kind of mixed filling aggregates.To achieve the above said purpose,we have,first of all,conducted the filling strength experiment and the fluidity experiment by classifying the tailings and the super-fine particle leaching residues.And,then,we have analyzed the flowing properties and the strength characteristic features of the filling materials in different ratios and mass fractions through the above mentioned filling ratio experiment.The results we have gained through the aforementioned experiments prove that the mass concentration has a great effect on the backfilling responding strength.That is to say,the greater the cement-sand ratio and the mass fraction,the higher the backfilling responding strength would be.For a certain range,it is possible for the increase of the amount of super-fine leaching residues to heighten the backfilling strength.What is more,it has been found that the composition of the leaching residue can also obviously influence the strength of the eventual backfilled materials,whereas the fluidity of the filling slurry can also obviously be reflected in the diffusance and the fluidity of the filling slurry tends to decrease with the increase of the mass fraction.In addition,in case the mass fraction is high,the increase of the cement amount may help to enhance the fluidity of the filling slurry.Thus,it can be deduced that the content increase of the leaching residue can help to reduce the fluidity of the filling slurry.And,finally,we have gained the optimal filling ratio of the different positions according to the filling technical demands of the lead-zinc mine and the corresponding laboratory experiment data,which can be stated as follows:The optimum cement-sand ratio,the ratio of the leaching slag to the classified tailings,the mass fraction of chamber stopes,the inter pillar mining,the first floor and pouring surface should be 1∶6,1∶5,71％;1∶6,1∶6,69％;1∶3,1∶6,71％,respectively.Thus,the above illustrated research results are in a well-proved position to provide a theoretical and practical value and the methods to be used for the leaching residue in filling of the said lead-zinc mine.