THE BARRATT METHOD
Plants designed using The Barratt Method as published in the Book Mineral Processing Plant Design, Practice, and Control Proceedings, include: Alumbrera Batu Hijau Cadia (one consultant among others) Candelaria Clarabelle (Inco) Collahuasi (line 1 & 2) Dreifontein El Teniente SAG 1 Ernest Henry Esperanza Fimiston Freeport 95K expansion Lisheen Numerous benchmarking exercises to operating grinding […]
Effect Of Primary Grind Size On Mineral Liberation
The extrapolated ore fragmentation and copper sulphide liberation plots reveal that the liberation levels and hence the flotation responses of the minerals would be essentially constant across a broad range of flotation feed sizing. This observation would indicate that flotation feed sizing coarser than 200µm K80, the practical norm for copper porphyry ore processing worldwide, […]
Chilean Mill
The Quartz Mill AKA Chilean Mill is one of the more popular types of the original Chilean mill. Still used for certain grinding problems, this mill employs the convex-concave principle of crushing ores, resulting in a product surprisingly low in slime content and which has its particles, such as sulfides and gold, well polished and free of […]
Rubber Tire Driven Ball Mill -Grinding Mill on Rollers
These very nice rubber tire driven grinding mills do not come cheaply priced. A small, 1 meter X 1.5 meter Rod mill OR Ball Mill cost approximately $160,000 US (in 2014) The small(est) mill starts at 600mm x 900mm and goes up to the large(est) 2100mm x 4200mm Options in the small “tyre” or Rubber roller grinding mills […]
Indice de Trabajo de Bond y su Procedimiento
El índice de trabajo de Bond se ha usado por muchos años para indicar el consumo de energía de un molino de bolas para obtener un tamaño de partícula deseado, usualmente expresada como el pasante bajo una malla especifica como la 150 o la 200.el valor del índice de trabajo de trabajo es una característica […]
How to Charge Rods into a Rod Mill
Rods are loaded or charged into a Rod Mill using a mechanised charger. The rod charger with extendable boom moves rods safely inside the trommel/trunnion before charging with a typical 30 seconds or less cycle time per rod. How you charging a rod mill is best explained by the video below. https://heathandsherwood64.com/products/mpe/grinding and https://www.mclellanindustries.com/rodcharger.html sells them.
Overflow VS Grate Discharge Ball or Mill – Why Retrofit
Allow me to compare: Ball mills can be of the overflow or of the grate discharge type. Overflow discharge mills are used when a product with high specific surface is wanted, without any respect to the particle size distribution curve. Overflow discharge mills give a final product in an open circuit. Grate discharge mills are used when the […]
Drop Weight tests using JKMRC Rotary Breakage Tester
The Drop Weight tests (DWT) by JK is now replaced by the JKMRC Rotary Breakage Tester. It is faster as confirmed by Tony and now used by many since its intro https://www.min-eng.com In an AG/SAG mill there are two main mechanisms of breakage, namely impact (high energy) and abrasion (low energy). The industry accepted JK impact breakage parameters, […]
Principle of Operation of Hydrocyclone
The Principle of Operation of Hydrocyclone is, in simple terms, the forces of gravity and centrifuge to separate large or heavy particles from smaller and lighter one. When sized correctly will “cut” like the ‘real cyclone’ below VS the imaginary ‘ideal’ one on the left. Hydrocyclones are preferred units for sizing or desliming large […]
Ball Mill Critical Speed
A Ball Mill Critical Speed (actually ball, rod, AG or SAG) is the speed at which the centrifugal forces equal gravitational forces at the mill shell’s inside surface and no balls will fall from its position onto the shell. The imagery below helps explain what goes on inside a mill as speed varies. Use our online formula […]