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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Milling circuit selection for the Nkomati 375 ktpm concentrator
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Milling circuit selection for the Nkomati 375 ktpm concentrator

机译：Nkomati 375 ktpm选矿厂的铣刨回路选择

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Dowding, Reynard and Associates Mineral Projects (DRAMP) was approached by the ARM/Lion Ore JV during July 2006 to conduct a feasibility study and control budget estimate for a new greenfield project for their NKOMATI Nickel mine 45 km east of Machadadorp. The scope included the evaluation and review of previous studies as well as a techno-economic trade-off on four possible comminution circuits ranging from conventional crushing and ball milling to fully autogenous milling. The following document encapsulates the thought process, decisions and the references used in selecting the final comminution route for the new 375 ktpm MMZ concentrator. Apart from the pilot test work performed, design simulations from a number of sources, performance results from a recently commissioned 100 ktpm MMZ concentrator, together with an understanding of the geology and mineralogy of the orebody and possible variations in the characteristics of the orebody over the life of mine were assessed. The results from all the above-mentioned work indicated that it would be possible to treat the MMZ ore at the desired throughputs to the desired grind sizes in a fully autogenous grinding (ABC-type) circuit. Autogenous milling is generally considered to be one of the higher risk milling circuits. This is mainly due to the fact that the ore, which is utilized as the grinding media, could be variable in terms of hardness and mineralogy/geology. Nevertheless, it is a very popular route as the cost benefits, more specifically the operating cost, are normally very attractive. This is especially the case when large low grade orebodies are evaluated. In North/South America, autogenous and semi-autogenous grinding circuits have been successfully employed during the past 20 years on large scale low grade operations. Taking all the above factors into account, the DRA/Nkomati project team recommended an autogenous circuit with the option to add steel to both the primary and secondary mills (if required) for the new operation in order to create the opportunity for significant operating cost savings. One has to bear in mind that all the new design simulations and decisions are based on previous work and potential unknown variations within the orebody will never be fully understood until the pit is operational for some time.
机译：ARM / Lion Ore合资企业在2006年7月与Dowding，Reynard和Associates矿产项目（DRAMP）进行了接洽，以对其Machadadorp以东45公里的NKOMATI镍矿的新绿地项目进行可行性研究和控制预算估算。范围包括对先前研究的评估和审查，以及从常规破碎和球磨到全自动研磨的四种可能的粉碎回路的技术经济折衷。下面的文件总结了在为新型375 ktpm MMZ选矿厂选择最终粉碎路线时所用的思考过程，决策和参考。除了进行的中试工作，许多来源的设计模拟，最近调试的100 ktpm MMZ选矿厂的性能结果，以及对矿体的地质和矿物学的了解以及矿体特性在整个过程中的可能变化。评估了我的生命。所有上述工作的结果表明，有可能在全自动研磨（ABC型）回路中以所需的产量将MMZ矿石处理至所需的研磨尺寸。自生铣削通常被认为是高风险铣削回路之一。这主要是由于用作研磨介质的矿石在硬度和矿物学/地质方面可能是可变的。然而，这是一条非常受欢迎的路线，因为成本收益（尤其是运营成本）通常非常有吸引力。当评估大型低品位矿体时尤其如此。在北美/南美，过去20年来，自磨和半自磨线路已成功用于大规模低品位作业。考虑到上述所有因素，DRA / Nkomati项目团队建议使用一种自生电路，可以选择在新轧机的主轧机和二级轧机中添加钢（如果需要），以便为节省大量的运营成本创造机会。必须记住，所有新的设计模拟和决策都是基于先前的工作，在矿井运行一段时间之前，将永远无法完全理解矿体内潜在的未知变化。

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