Grinding

Indice de Trabajo de Bond y su Procedimiento

Indice Bond Formula

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 … Read more

How to Charge Rods into a Rod Mill – The Charging Process Equipment

Rod Mill Charger Loading Machine

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.   http://heathandsherwood64.com/products/mpe/grinding and http://www.mclellanindustries.com/rodcharger.html sells them.

Overflow VS Grate Discharge Ball or Mill – Why Retrofit

Compare Overflow VS Grate Discharge Ball Mill

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 … Read more

Drop Weight tests (DWT) using JKMRC Rotary Breakage Tester

JK Drop Weight 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 http://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, … Read more

Principle of Operation of Hydrocyclone

What does a cyclone do

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 … Read more

Ball Mill Critical Speed

ball mill critical speed formula derivation

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 … Read more

Rod Mill Work Index Table

Here is a list presented in table form of Rod Mill Work Index as tested/presented by SME handbook of mineral processing, N.L Weiss Editor, N.Y. 1985. Rapid Determination of Bond Rod-mill Work Index by Craig Taylor on Scribd  

Table of Bond Work Index by Minerals

This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on ‘around the world sample’.  You can find the SG of each mineral samples on the other table. Source 1: Table of materials reported by Fred Bond Source 2: Outokumpu, The science of comminution Source 3: Equipment and pipelines Source 4: … Read more

Relative Bond Work Index BWi | Comparative Grindability Test Procedure

Ball Charge

The test is designed to give a reasonable indication of the grinding work index of an ore material relative to one or more known standards. It is not applicable to mill tailings material. Basic Equipment Set of screens @ 75 to 2440 micron sizes. Ro-Tap Sieve Shaker Ball mill rolls CMS ball mill No.1 with approximately … Read more

Bond Grindability Test Procedure

BWi

The Bond Ball Mill Grindability test is designed to give a measure of the grinding characteristics of a material by finding the amount of size reduction resulting from a controlled energy input. Ball Mill Grindability of a material depends upon its hardness, structure, the manner in which it is fractured. The grindability is useful in evaluating power requirements … Read more