谦比西铜矿缓倾斜中厚破碎矿体分流出矿技术

Divided-flow Drawing Technology of Gently Inclined Medium-thick Broken Ore Bodies in Chambishi Copper Mine

缓倾斜中厚破碎矿体作为一种难采矿体,多年以来长期困扰采矿工程技术人员;而无底柱分段崩落法以其安全、高效和适应性强的优点,可以较好地适应该类型矿体的开采。但无底柱分段崩落法存在的下盘损失和贫化大问题,一直影响该采矿方法的应用效果。为解决该问题,以谦比希铜矿缓倾斜中厚破碎矿体开采为工程背景,依据随机介质放矿理论的放矿口分流效应,提出了双进路分流出矿技术方案。为了验证该方案的可行性,首先在实验室建立了放矿模型,根据进路的出矿顺序不同,设计了3种出矿方案。由实验结果可知:先从距离矿体较远的进路出矿,回采指标较好。基于实验室实验结果,在谦比希铜矿主采区西区408 m水平分段5#采场进行了工业试验,将回采率提高了9.34个百分点,贫化率降低了0.36个百分点,试验效果显著。

Gently inclined medium-thick ore body as a kind of hard-to-caving ore body has perplexed mineral engineering technicians for a long time. The pillarless sublevel caving with its advantages of safety, efficiency and adaptability can better ex- plore this type of ore body. However, this method has problems of high footwall ore loss and dilution which usually affects its application. To solve this problem, under the background of caving gently inclined medium-thick ore body in Chambishi Copper Mine and based on the diversion effect of draw-point from stochastic medium theory of ore-drawing, a divided-flow drawing technology scheme with double drifts was put forward. In order to verify the feasibility of the scheme, ore drawing model was firstly established in the laboratory. Then according to the difference of drifts drawing sequence, three kinds of drawing scheme were designed. The experiment resuhs show that the recovery indicators were better when drawing from the drift farther away from ore body. According to the laboratory experimental results, industrial tests were carried out in No. 5 stope at 408 meters＇ level of Chambishi Copper Mine. In the tests, the recovery ratio was increased by 9. 34%, and dilution ratio was decreased by 0. 36%, so the experimental effect was very remarkable.