毛坪铅锌矿采场充填体放热特性试验研究

为了研究毛坪铅锌矿采场胶结充填体的水化产热及温度变化特性，基于现场采集的尾砂和机制砂，采用相似材料实验方法，配制八种不同水灰比、不同骨料比例的充填体试样，在实验室测定胶结充填体试样的温度变化曲线，然后计算充填体材料胶结过程中的水化热，最后分析充填材料水化热与产热量随时间的变化规律。结果表明：充填体试样呈现前期迅速升温，然后缓慢下降至环境温度的整体趋势；水化产热速率及温度变化与充填体材料的配比以及环境温度有关。得到的主要结论为：机制砂比例和水灰比越大，充填体材料胶结的产热量越大，而增大充填体材料的尾砂含量能有效降低充填体水化产热量；水含量对充填体的产热影响最大，因此降低水化产热量最有效的方法是降低水灰比，其次是增大骨料中的尾砂含量，为毛坪铅锌矿选择合理的充填体配比提供了依据。

Study on the exothermic characteristics of backfill in the golf of Maoping Lead Zinc Mine

In order to study the hydration heat generation and temperature change characteristics of cemented backfill in Maoping lead zinc mine stope, based on the tailings and machine-made sand collected on site, eight backfill samples with different water cement ratio and different aggregate ratio are prepared by using the similar material experimental method. The temperature change curve of cemented backfill samples is measured in the laboratory, and then the hydration heat in the cementation process of backfill materials is calculated, finally the variation law of hydration heat and heat production of filling materials with time is analyzed. The results show that the filling sample shows an overall trend of rapid temperature rise in the early stage and then slow decline to the ambient temperature, and the variation of hydration heat production rate and temperature is related to the ratio of filling materials and ambient temperature. The main conclusions are as follows: the greater the proportion of machine-made sand and water cement ratio, the greater the heat production of filling material cementation, and increasing the tailings content of filling material can effectively reduce the heat production of filling hydration; the water content has the greatest impact on the heat production of the filling body, thus the most effective way to reduce the heat production of hydration is to reduce the water cement ratio, followed by increasing the tailings content in the aggregate, which provides a basis for selecting a reasonable filling body ratio in Maoping lead-zinc mine