论文部分内容阅读
本文叙述了直径为 ０．６９ｍ湿式半自磨机连续运转情况，并采用各种模型来预测按比例放大的半自磨机的性能特性。使用这种小型磨机一直是众多作者所争论的问题。然而由它所提供的试验数据的优点，已引起人们的关注，并按照这种试验思路继续研究。其优点是：所需的试料少；具有使用钻机获取岩芯来测试矿石易变性的能力；便于在不同操作条件下记录磨机内物料量的变化；容易倒空磨机内的物料。使用这种试验方法，每批试验仅需５００ｋｇ矿石。 与大型半自磨机相比较，说明净比功耗的基本范围与产品粒度分布极为吻合。若用８０ｍｍ钢球和给矿粒度上限在８０～１２５ｍｍ范围内，必然会出现吻合的现象。大型半自磨机的所有特性，可由小型半自磨机模拟再现，并且容易测定，也可以比较用不同的模拟程序所做的预测。 通过试验研究得出如下结论：只要知道钢球直径和试料的给矿粒度，则从小型自磨机的试验中获得的数据，可以准确用于半自磨回路的设计，即用常规公式，将计算结果直接按比例放大。模拟可以提高试验结果的价值，对许多选择性的试验非常有用。这种研究对以下２种情况更显示其优点： （１）可按比例放大建设因没有足够试料进行半工业试验的小选厂； （２）可按比例放大设计大型磨矿回路，从而达到避免
This paper describes the continuous operation of a wet semi-autogenous mill with a diameter of 0.69 m and uses various models to predict the performance characteristics of the semi-autogenous mill that is scaled up. The use of such small mills has been the subject of debate by many authors. However, the advantages of the experimental data provided by it have drawn people’s attention and continue to be studied in accordance with this experimental idea. The advantages are: fewer samples required; the ability to use rigs to obtain cores to test ore variability; ease of recording changes in material volume within the mill under different operating conditions; and ease of emptying the material in the mill. Using this test method, only 500kg ore per batch is required. Compared with the large semi-autogenous mill, it shows that the basic range of net specific power consumption is in good agreement with the product particle size distribution. If 80mm steel balls and feed grain size in the upper limit of 80 ~ 125mm, there will inevitably be the phenomenon of anastomosis. All the features of a large semi-autogenous mill can be modeled by a small semi-autogenous mill and easily measured, as well as predictions made with different simulations. Through the experimental study concluded that as long as the ball diameter and sample to know the ore size, the data obtained from the test of the small self-mill, can be accurately used in semi-self-grinding circuit design, that is, using the conventional formula, The calculation results directly proportional to enlarge. Simulation can increase the value of test results and is useful for many selective assays. This study shows its merits in the following two cases: (1) Scaled-up construction of small beneficiation plants that do not have enough samples for semi-industrial tests; (2) Large scale grinding circuits can be scaled up to achieve avoid