David Michaud 
When are steel liners better than rubber/poly-met liners in a SAG mill or Ball Mill? Let’s compare! Rubber Liners are better for abrasion grinding ie: cascade action but not for cataract mills. The graph below shows the increased operating cost of rubber and steel liners as the grinding ball size increases. Larger mill, larger ball… … Read more
Liquid-Solid Relationships Specific Gravity Specific Volume
An example of how you can calculate the slurry flow/volume of a given SG, %Solids and Tonnage. EXAMPLE: 3,400 tons of dry solids is processed in 24 hours in water with a specific gravity of 1.0 and the concentration of solids by weight is 33% with the solids having a specific gravity of 3.7 then … Read more
Ore specific gravity Pulp Density Relations
Here is the formula for specific gravity of a slurry, S is: S = specific gravity of slurry Si= specific gravity of liquid phase Ss= specific gravity of solids phase Cw = concentration of solids by weight Cv= concentration of solids by volume EXAMPLE: if the liquid has a specific gravity of 1.2 and the concentration … Read more
Part of your slurry dewatering system is the production of a filter cake. Obviously that cake must have as low a moisture as possible. A great tool you can give your operator to measure, determine and monitor that concentrate filter cake humidity and control their process variable is a moisture scale like this. You just … Read more
How to Size a Cyclone or Hydrocyclone has a well establish step-by-step process for which Richard A. Arterburn was a pioneer. Since this paper and its hydrocyclone sizing method is becoming hard to find, I uploaded it on here. Use the 911Metallurgist Online Cyclone Design Calculator. Hydrocyclone Design & Sizing Parameters – Calculations & Equations I … Read more
Let me point you to two good papers on the flotation of mixed copper oxide and sulphide minerals with xanthate and hydroxamate collectors. A great detailed thesis called “An Investigation of Copper Recovery from a Sulphide-Oxide Ore with a Mixed Collector System” and one called “Flotation of mixed copper oxide and sulphide minerals with xanthate and … Read more
What is the Bond Work Index Formula-Equation? In case you had forgotten, here is a classic: You can read all the details of this now “Biblical” grinding power requirement calculation formula in Fred Bond’s original paper. You can also review the step-by-step Bond Work Index Test Procedure I posted here. See this useful summary Table of Bond Work … Read more
Learning how to compare flotation test results made easy: One set of test from Lab A is displayed by the red dots and compare to the blue and/or green data set from Lab B. Lab B is red inferior. Here are the comparative Grade VS Recovery Curves. Metallurgical Efficiency: One of the most important and basic … Read more