Primary autogenous mill feed is either primary crusher discharge or run of mine ore, containing material on each size of the screen analysis below the largest piece in the feed. It is subject to the large variations in size analysis normally found in primary crusher products or run of mine ore. There can also be … Read more
The first two Grinding Efficiency Measurement examples are given to show how to calculate Wio and Wioc for single stage ball mills. Figure 1. The first example is a comparison of two parallel mills from a daily operating report. Mill size 5.03m x 6.1m (16.5′ x 20′ with a ID of 16′). This example shows … Read more
In the context of this paper a simulation model for a size reduction device is an equation or equation set which allows the calculation of the product size distribution from the device for a specified size distribution of feed. The model might be expressed as a simple algebraic expression, as a matrix equation, or as … Read more
Early laboratory balling and pelletizing tests resulted in balls or pellets superior in quality as compared to production pellets, no matter what the variable being tested. In order to indicate more closely what a material would do for balling and pelletizing in a plant we felt it was necessary to approach the plant conditions. When … Read more
The relationship between the grinding power consumption and the product size distribution has been widely studied since it is a subject of major interest for plant design and optimization. The conventional approaches, generally of empirical nature, have led to the formation of equations such as Bond’s, which has been used in sizing most of the … Read more
The inferred particle size model is a key part of the grinding control system presently being used. The model, as used during the evaluation period, related the percent +65 mesh material in the cyclone overflow to three of the mill operating variables: ball mill feed, mass flow of ore to the cyclones, and mass flow … Read more
The marked changes in electrokinetic potentials of quartz in dodecylammonium acetate (DDA) solutions were postulated to result from the association of adsorbed collector ions into two-dimensional aggregates, called hemi-micelles. The rapid increase in flotation rate of quartz was shown to coincide with hemi-micelle formation. Micelle Hypothesis In dilute solutions alkyl ammonium and related salts behave … Read more