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Asymmetric distributions of desired component mass fraction in point samples

机译:点样品中所需组分质量分数的不对称分布

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Introduction. Desired component mass fraction distributions in point samples at preparation plants are asymmetric, and it is due to the natural heterogeneity of ores. The theory of mass fractions distribution asymmetry in samples. The theory is based on the lump sampling of point samples. Mass fraction distributions here consist of two different-sized fractions: valuable mineral and rock. These distributions are always asymmetric. Lump dispersion for asymmetric distributions depends on the mass fraction of the valuable mineral for both released grains and aggregates. Mass fraction distribution in point samples withpoor product mass fraction is described by the Poisson formula. Materials and methods of research. Mass fraction distribution correspondence to the Poisson formula was experimentally confirmed based on an artificial rock mass represented by quartz grit with colored markers. Point samples of different mass were collected from the rock mass. Experimental estimates. The distributions obtained experimentally correspond to the distributions calculated by the Poisson formula. The paper introduces a method for experimental determination of valuable mineral average grain size and ore texture index. These values were determined for asbestos ore to exemplify the method proposed. Results discussion. Sampling standards do not consider the asymmetry of mass fraction distributions in point samples. At preparation plants the asymmetry manifests itself in hurricane samples, positive product imbalance, and divergence of double weights analysis results, that exceed the acceptable limits. The asymmetry of components mass fraction distributions in concentrates should be taken into account in sampling standards and methods, as well as at preparation plants in general.
机译:介绍。选矿厂点样品中所需的组分质量分数分布是不对称的,这是由于矿石的天然非均质性所致。样品中质量分数分布不对称的理论。该理论基于点样本的块采样。这里的质量分数分布由两种不同大小的分数组成:有价值的矿物和岩石。这些分布始终是不对称的。不对称分布的块状分散取决于释放的颗粒和聚集体中有价值矿物的质量分数。产品质量分数较差的点样品的质量分数分布由泊松公式描述。研究的材料和方法。基于由石英砂砾和彩色标记表示的人造岩体,实验证实了与泊松公式的质量分数分布对应关系。从岩体中收集不同质量的点样品。实验估计。实验得到的分布与泊松公式计算的分布相对应。本文介绍了一种有价值的矿物平均粒度和矿石质构指数的实验测定方法。这些值是针对石棉矿石确定的,以举例说明所提出的方法。结果讨论。抽样标准不考虑点样品中质量分数分布的不对称性。在选矿厂,不对称性表现为飓风样品、正产品不平衡以及双倍权重分析结果的差异,这些结果超出了可接受的限度。在取样标准和方法以及一般的制备工厂中,应考虑精矿中组分质量分数分布的不对称性。

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