Study on flow of ore in large scale ore pass systems. Mechanism of gravity flow and mixing of ore in ore pass.

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Other Title
  • 鉱石立坑内の鉱石の流れに関する研究　（第１報）　立坑内における鉱石の重力流動と混合
  • コウセキ タテコウナイ ノ コウセキ ノ ナガレ ニ カンスル ケンキュウ 1
  • Mechanism of gravity flow and mixing of ore in ore pass
  • 立坑内における鉱石の重力流動と混合

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Abstract

Most big limestone quarries in Japan use an ore pass system with large vertical or inclined ore pass to transport the ore from the bench to the crushing room. Despite their importance in controlling the quality of quarry products, the mixing property and the mechanism of the gravity flow of ore in the ore pass system are not apparent in most quarries. The mixing property is considered to depend on the material properties of the ore, the geometry of the system and also on the mechanism of the gravity flow inside the system.<BR>Based on the observation of the so called “breathing” phenomena of the ore pass in Toumi limestone quarry, a model for the gravity flow considering the bulk density variation through secondary motions of ore and the forming of a local micro arch is proposed. Several phenomena occurring in the ore pass according to the production of ore could be easily explained using this model. Extending this gravity flow model to an inclined ore pass, the possibility is shown that the mixing property of an inclined ore pass may also depend on its length.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 106 (2), 60-64, 1990

    The Mining and Materials Processing Institute of Japan

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