SAG Mill Feed Chute Design| Long Life | Wear Resistant
This design of SAG mill feed chute lasted 9 months seeing 90,000 TPD. It is 600 brinell chrome steel. With the big liners on the bottom of the chute you need to get a Chevron cast into the top to push the feed out to the sides for the first little while and then as […]
SAG Mill Operating Load : SAG Mill Volumes
How much rock and balls must you hold in your SAG mill for it to best operate?
Mill Liner Profiler Tool -Track Liner Wear Pattern
Here is a home-made tool to measure or obtain a fingerprint of your SAG and Ball Mill Liner wear pattern/profile. Each time you shut down, get a profile and build a wear-life over time database to better predict your next reline job or monitor improvements to your liner design. Simple Tool to Track Liner Wear […]
Optimum Mill Liner Spacing | Design Effectiveness SAG
The images (chart) below is industry standard when it comes to the relationship between a mill liner’s lifter bar height and the lifter to lifter spacing. What tonnage do you think this SAG mill liner design gets?
Effect of Regrind on Grade and Recovery
How do you know if or when regrinding and applying further liberation power can improve your metal’s recovery? Below here is data showing what is to be gained by correctly applying regrind to a copper stream. On the graph, the red/white dot points to where the plan currently is light green Grade-Recovery curve VS where is could be on […]
SAG Mill Ball Size Evaluator | Evaluation Factors | Calculate Diameter
Lets calculate/select/pick a new ball for your SAG mill. Now, lets suppose you have a SAG Mill and Ball Mill that are not drawing full kW Power. The SAG Mill has a “small” circulation load of oversize given be the 3/8″ trommel screen and the 1/2″ x 1 1/4″ discharge grates. The load of 4″ balls […]
Do I Need Bigger and Larger SAG Mill Balls
How do you know if a larger SAG ball will increase your tonnage and how to select it? When is it time to change to a larger Ball in your SAG Mill? It’s difficult to generalize on SAG mill ball size selection as it depends on a number of factors: Ore properties Level of impact […]
Roping HydroCyclone -Bad Operation
HydroCyclone Roping – Incorrect Cyclone Operation is often caused by too high a volume feeding into the cyclone. If the apex capacity is exceeded a condition known as roping may occur. Normally, the underflow sprays out of the apex. When roping occurs, the air core inside the apex collapses and the spiraling motion is almost lost. […]
Hydrocyclone Efficiency Curves
The Hydrocyclone Efficiency Curves are affected by many operating factors such as feed density, apex and vortex sizes and feed pump pressure. These factors will cause your cyclone classification to operate correctly, in roping or spraying mode. Everyone knows or has seen an “Ideal Cyclone Efficiency Curve” VS an actual real life hydrocyclone Efficiency Curves? I […]
SAG Mill Trommel Screen
A SAG Mill trommel screen lets you control the true discharge size of your SAG mill or the transfer size to the downstream Ball Mill circuit. A well sized trommel should not let rocks pass to the Ball Mill if they are to be more than say 5/8″ or 16mm In the image case below, strangely […]