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处置选厂大量尾砂的必要性通常认为是一重要的生态问题。另一方面胶结充填采矿法需要大量的砾石和波特兰水泥,这就给矿山工作加重了经济负担。这些经济问题引起为寻求一种解决问题的办法而进行研究,最有吸引力的解决问题的办法,是使用选厂尾砂作为胶结充填料的骨料,并且采用不太昂贵的物料取代波特兰水泥。本文介绍了使用由各种类型胶结剂与意大利一个选厂的细粒尾砂组成的各种混合料,充填回采工作面的试验研究结果,作为胶结剂,研究了波特兰水泥,波特兰水泥与粉煤灰组成的混合料、被活化的高炉炉渣、以及石灰与两种天然火山凝灰岩或粉煤灰组成的混合料。为了揭示尾砂参数的作用,按照意大利采用的水泥试验标准,采用普通砂子进行了同样的试验,同时还研究了各种成份、含水量和硬结时间的影响.其结论如下:1.用粉煤灰代替26～40%(重量比)的波特兰水泥,仅在硬结期短的情况下,强度稍有下降;经过12周或更长的硬结时间后,充填体的极限强度可达到14MPa,这个数值超过了在只有波特兰水泥而无添加剂时的强度。2.无论是采用石灰和粉煤灰混合料,还是采用石灰和凝灰岩混合科,这种不含水泥的胶结剂所得到的试验结果是一样的;它们的极限强度都低于0.20MPa,即使硬结时间很长也是这样。3.如果使用被10%(重量比)的波特兰水泥活化了的高炉炉渣作为胶结剂,那么其极限强度和只有波特兰水泥而没有添加剂的情况是一样的。最后,讨论了有关的试验研究标准值。
The need to dispose of a large number of tailings is generally considered to be an important ecological issue. On the other hand, the cementing and filling mining method requires a large amount of gravel and Portland cement, which adds to the economic burden on the mining work. These economic problems have led to the search for a solution to the problem and the most attractive solution to the problem is to use the tailings of the mill as the aggregate of the cements and replace the Porter with less expensive ones Blue cement. This paper presents the results of a pilot study using various types of cements and fine-grained tailings from a selected mill in Italy as filling agents to study the effects of Portland cement, Portland A mixture of cement and fly ash, activated blast furnace slag, and a mixture of lime and two natural volcanic tuffs or fly ash. In order to reveal the role of tailing parameters, the same test was conducted using ordinary sand according to the cement test standard adopted by Italy, and the influences of various components, water content and setting time were also studied.The conclusions are as follows: Gray instead of 26 ~ 40% by weight of Portland cement, the strength decreased slightly only in the short hardening period; after 12 weeks or longer hardening time, the ultimate strength of the filling body can reach 14MPa, This value exceeds the strength of Portland cement with no additives. 2. The cement-free cement obtained the same test results, both with lime and fly ash mixes, or with a lime and tuff mixing section; their ultimate strengths were all below 0.20 MPa, even though the induration It’s been a long time. 3. If blast furnace slag activated by 10% by weight Portland cement is used as a cement, the ultimate strength is the same as for Portland cement with no additives. Finally, the relevant experimental study standard values are discussed.