海水条件下矿山充填应用硅灰的试验研究  

Experiment Study on the Application of Silica Fume in Mine Filling with Seawater

作　　者：颜丙乾 吕文生[1,2] 杨鹏[1,3] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]金属矿山高效开采与安全教育部重点实验室,北京100083 [3]北京联合大学北京市信息服务工程重点实验室,北京100101

出　　处：《矿业研究与开发》2015年第10期6-9,共4页Mining Research and Development

基　　金："十二五"国家科技支撑计划项目(2012BAB08B01)

摘　　要：三山岛金矿充填用水中Cl-、SO42-和Mg2+等成分浓度较高,影响充填体的强度。根据海水和硅灰的化学成分检测结果,分析研究海水中氯盐、硫酸盐、镁盐对充填体的破坏机理,并通过试验验证硅掺量为8%时,卤水制作充填试块的抗压强度显著提高;另外,提高充填料浆的浓度和灰砂比,也对提高充填体抗压强度有较大的作用。分析认为,硅灰对于提高充填体的密实性,减少氯离子的渗透性和硫酸盐的流动性,降低充填料浆中的Ca(OH)2含量,减少钙矾石形成发挥了重要作用。因此,为了提高卤水条件下的充填体强度,掺加硅灰有一定的意义。The seawater affects the strength of the filling body in Sanshandao Gold Mine,due to high concentrations of Cl-,SO42-, Mg2＋and other ingredients.Based on the chemical composition of the seawater and silica fume,the failure mechanism of the filling body under chloride,sulfate,magnesium in seawater was analyzed.Tests indicated that when the amount of silica fume was 8%in filling water,the compression strength of filling body enhanced obviously.Besides,increasing the concentration of filling slurry and the cement-sand ratio was in favor of filling strength.Analysis believed that the silica fume played an important role in improving the density of the filling body,reducing the permeability of chloride ions and sulfate liquidity,reducing the Ca（OH）2content of filling slurry,and decreasing the ettringite formation.Therefore,adding silica fume had a certain significance to improve the strength of the backfill under the seawater condition.

关 键 词：海水 硅灰 胶结充填 充填体强度 

分 类 号：TD857[矿业工程—金属矿开采]