• 自然科學版 英文版
    自然科學版 英文版
    自然科學版 英文版

    您目前所在的位置:首頁 - 期刊簡介 - 詳細頁面

    中南大學學報(自然科學版)

    Journal of Central South University

    第10卷    第2期    總第20期    1979年6月

    [PDF全文下載]    [Flash在線閱讀]

        

    礦泥重選理論初探
    黃樞1

    (1.礦山系選礦教研室)

    摘 要: 現有礦泥重選設備,除離心選礦機外,礦漿流態都屬層流。運用層流理論公式可求出單個礦粒的移動速度,同時得知流膜厚度、底面的坡度和摩擦系數是影響礦粒分選好壞的重要因素。當粒群在層流流膜中運動時,促使礦粒懸浮的不是水流的紊動作用而是顆粒與顆粒間的切應力。過去提出的一些礦漿分層概念都不夠全面。本文根據泥沙運動的一般規律及結合礦泥流膜的特點,將礦漿分成擾動層、懸移層、推移層和沉積層,并闡明各層的作用。指出下部推移層的松散不足和沉積層壓緊是固定式礦泥溜槽效率低的原因。利用搖動可以強化礦泥分選過程。

     

    關鍵字: 離心選礦機; 礦泥; 礦粒; 摩擦系數; 流膜; 橫流皮帶溜槽; 重選設備; 分散壓; 細顆粒; 礦漿流態

    An Approach to the Theory of Gravity Slime Concentration
    黃樞1

    1.礦山系選礦教研室

    Abstract:The flow pattern of pulp in currently used gravity slime concentrators except centrifugal separator belongs to laminar type. The travelling velocity of single particle sliding along an inclined surface in laminar flow may be calculated by the theoretical formula, and consequently it is known that the major factors affecting the separating efficiency of particles are the thickness of flow film, the slope of inclined surface and the coefficient of friction between particles and inclined surface. In practice, however, a mass movement of particles really takes place there and the acting force which causes particles maintaining in suspension is the shear stress between particles involved and not the eddy movement at all. Previous concepts proposed for the stratification of pulp in slime concentrator are considered to be not complete. According to the general role of pulp movement and the characteristics of slime flow film, in this paper the author proposes that the pulp in slime concentrator may be divided into four layers, i.e. turbulent layer, suspension layer, transportation layer and sedimentation layer, and explains the mechanism of each layer. A low efficiency of slime sluice of fixed type is due to inadequacy of loosing at trasportation layer and the packing of sedimentation layer. The process of slime concentration may be improved by the application of a shaking force to the bed of a concentrator.

     

    Key words:

    中南大學學報(自然科學版)
      ISSN 1672-7207
    CN 43-1426/N
    ZDXZAC
    中南大學學報(英文版)
      ISSN 2095-2899
    CN 43-1516/TB
    JCSTFT
    版權所有:《中南大學學報(自然科學版、英文版)》編輯部
    地 址:湖南省長沙市中南大學 郵編: 410083
    電 話: 0731-88879765 傳真: 0731-88877727
    電子郵箱:zngdxb@csu.edu.cn 湘ICP備09001153號
    新快三