三山岛金矿盐卤水对胶结充填体早期强度的影响  

Effect of Bittern in Shanshandao Gold Mine on the Early Strength of Cemented Backfill Block

作　　者：林枝祥 杨鹏[1,2] 吕文生[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]北京联合大学,北京100101

出　　处：《金属矿山》2015年第7期164-167,共4页Metal Mine

基　　金："十二五"国家科技支撑计划项目(编号:2012BAB08B01)

摘　　要：以往的研究表明,水中盐卤成分较高时,将对尾砂胶结充填体的强度有负面影响,而有时为提高胶结充填体的早期强度,会添加少量的早强剂如硫酸钠、氯化钠等。为了解三山岛金矿盐卤水对尾砂胶结充填体强度的影响,研究了分别拌合盐卤水和普通自来水的尾砂胶结试块和水泥净浆试块的强度,并对2种拌合水的水泥净浆试块进行了XRD分析。结果表明,三山岛金矿的盐卤水可提高尾砂胶结试块和水泥净浆试块的早期强度。其原因是拌合水成分不同,试块内部的水化反应也不同,盐卤水水泥净浆试块中生成的氢氧钙石和C-S-H凝胶更多;对试件强度有负面影响的钙矾石的量虽然也有所增加,但就早期强度而言,C-S-H凝胶和氢氧钙石的积极影响更明显。该盐卤水对尾砂胶结充填体长期强度的影响将有待后期试验研究。Previous studies have shown that high bittern composition has negative influence on strength of cemented tailings backfilling block. But sometimes in order to improve the early strength of cemented filling block,few early strength agents,such as sodium sulfate,sodium chloride would be added. In order to study the effect of bittern on the strength of cemented tailing backfilling block in Sanshandao Gold Mine,the strength of cemented tailings test block and cement test block respectively mixing with bittern and tap water have been researched. And XRD technology is used to analyze the cement test block mixing with bittern and tap water. The results show that the bittern in Sanshandao Gold Mine improved the early strength of cemented tailings test block and cement test block. The main reason for the difference is that the mixing water has different components,making the hydration reaction different in internal test block. Cement test block mixing with bitter generated more portlandite and C-S-H gel. Although the amount of ettringite which is harm for the specimen strength increased,in terms of early strength,the positive effect of C-S-H gel and portlandite is more obvious. The long-term strength of cemented tailings backfill affected by bittern will be experimented.

关 键 词：盐卤水 胶结充填 尾砂胶结试块 水化反应 单轴抗压强度 

分 类 号：TD926.4[矿业工程—选矿]