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首页> 外文会议>International Seminar on Paste and Thickened Tailings >Design of the paste backfill recipe for the Pinos Altos Mine, Mexico--influence of tailings clay mineral fraction on strength and rheology
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Design of the paste backfill recipe for the Pinos Altos Mine, Mexico--influence of tailings clay mineral fraction on strength and rheology

机译：Pinos Altos Mine的粘贴回填设计设计，墨西哥 - 尾矿粘土矿物分数对力量和流变的影响

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Agnico-Eagle Mexico S.A. de C. V. (AEM) plans to commission a new paste backfill plant at the Pinos Altos mine (Mexico) in March 2010. In 2008-2009, the paste recipe was designed to develop required strength for free standing of the backfill in stope after 28 days. This recipe development was not as easy as usual because the tailings contain a significant proportion of clayey minerals and these cohesive minerals control the rheology of tailings. This paper presents the different laboratory investigations performed to achieve the required strength considering the flow characteristics of the tailings. The paste recipe design was performed in two phases. The first one included testing of different paste recipes with varying water and binder (Chihuahua cement) content. The main investigation of the rheology (laboratory rheometer tests) of the paste was performed during this phase. The second phase was carried out to optimise the paste recipe by changing different ingredients to improve the geomechanical properties considering the clay mineral content in tailings. Tests with slag (Lafarge Canada), with deslimed tailings and with water reducing admixtures (BASF Glenium 7700~(TM) and 7102~(TM)) were performed (Glenium 7102 and 7700 are trademarks from BASF Construction Chemicals). In this phase, five backfill samples were also cured under 300 kPa of vertical pressure, which is similar to the one estimated at the bottom of a typical stope. Among mixtures tested, paste with 7% Chihuahua cement/71% solids and paste with 7% Chihuahua cement and Lafarge Slag in a 20:80 proportion/71% solids gave the best results. These mixtures were selected for tests under vertical pressure and results showed significant strength increases at 28 curing days relative to the standards. Thus, significant strength increase is expected in stope due to consolidation relative to laboratory results. Tests with deslimed tailings and admixtures were not conclusive, and these options to increase strength were not retained. The rheological measurements performed on all mixtures tested showed a Bingham plastic behaviour. A clear influence of the water and binder content were observed on the yield stress of the paste.
机译：Agnico-鹰墨西哥SA de CV与（AEM）计划委员会于2010年3月在诺斯图斯矿（墨西哥）的新贴回填厂在2008- 2009年，该贴的配方设计开发所需的强度回填的独立在28天后采场。这个食谱的发展是不容易像往常一样，因为尾矿含有粘土矿物的显著比例，这些矿物质凝聚力控制尾矿的流变。本文介绍了不同的实验室进行研究，以达到所需强度考虑尾矿的流动特性。分两个阶段执行粘贴配方设计。第一种包括不同膏配方具有不同水和粘合剂（吉娃娃水泥）的含量测试。在这个阶段进行糊的流变学（实验室测试流变仪）的主要调查。第二阶段进行，通过改变不同成分，以提高地质力学特性考虑尾矿的粘土矿物的含量，以优化浆料配方。测试用熔渣（拉法基加拿大），与除掉矿泥的尾矿和与减水剂（BASF GLENIUM 7700〜（TM）和7102〜（TM））进行（GLENIUM 7102和7700是从巴斯夫化学建材商标）。在这个阶段，五个回填样品也低于300千帕的垂直压力，这是一个类似于估计的典型采场的底部固化。在所测试的混合物，粘贴用7％吉娃娃水泥/ 71％固体，并用7％的吉娃娃水泥和拉法基渣在20:80比例/ 71％固体粘贴，得到最好的结果。被选择用于在垂直压力之下和结果测试这些混合物显示出在28天固化相对于标准显著强度增加。因此，显著强度增加，预计在采场，由于相对于实验室结果整合。与除去矿泥尾矿和外加剂试验没有定论，而且这些选项来增加强度并没有保留。上所有的混合物进行流变学测量测试的表现出宾汉塑性行为。未观察到对糊状物的屈服应力的水和粘结剂含量的影响清楚。

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