### QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE

specification of the Bond mill are given in Table 1. Table 1. Bond s mill specification and grinding conditions Mill diameter D m cm 30.48 Mill Length L m cm 30.48 Number of mill rotations in minutes n min-1 70 Mill balls weight M b kg 21.125 Geometry of mill liner smooth Grinding type dry V ore cm 3

Chat Online### Bond formula for the grinding balls size calculation

Oct 19 2017 · In our example the grinding balls diameter needed to load into the mill must be equal to 40-50 mm. Let s sum up. The grinding balls diameter determined by the Bond formula has a recommendatory character and serves as a starting point for calculating the necessary proportion grinding media feeding a new mill.

Chat Online### A Method of C alculating Autogenous/ Semi-Autogenous

rod mill work index has not been de ned as yet. The ball ﬁ mill work index is con rmed at 16 kWh/t. The operating ﬁ work index though is in the range of 21 kWh/t to 25 kWh/t showing high inefﬁ ciency. This raises the point that in some cases the Bond EF4

Chat Online### Orway Mineral Consultants Canada Ltd. Mississauga ON

2006). The laboratory bench-scale SAG mill reproduces operating conditions of a commercial SAG mill in a closed circuit dry grinding environment. The ground product for the laboratory SAG mill is then submitted to the Bond ball mill work index test. The number of SAG mill

Chat Online### Bond Index Ball Mill / Rod Mill BT 100 XLRETSCH

The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave-shaped design. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill. The Rod Mill Work Index (RWI) is used for particle size determination in a size range from 25 mm down to 2.1 mm whereas Ball Mill Work

Chat Online### JK Bond Ball Mill TestJKTech

Use of Work Index Since its introduction in the 1960s the Bond Ball Mill Work Index (BBMWi) parameter has been extensively used in predicting ball mill power draw. Along with comminution circuit design the work index parameter is widely used in tracking mill performance. Due to

Chat Online### Bond Rod Mill Index Test JKTech

Measuring ore grindability in rod mills. The Bond Rod Mill Work Index is a measure of the resistance of the material to grinding in a rod mill. It can be used to determine the grinding power required for a given throughput of material under rod mill grinding

Chat Online### (PDF) A comparison of wear rates of ball mill grinding media

The Bond abrasion index test was first . The application of the method to industrial mills shows that a grinding mill operation could present an invariant behaviour that can be exploited for

Chat Online### AMIT 135 Lesson 6 Grinding CircuitMining Mill Operator

Grinding takes place in more "open" space which makes the retention time longer and adjustable compared to crushers. Theoretical size reduction and power ranges for different grinding mills image (135-6-1) AG/SAG Mills Autogenous Grinding (AG) Mill. Wet or dry Primary coarse grinding (up to 400 mm feed size) Grinding media is grinding feed

Chat Online### CORRELATION BETWEEN BOND WORK INDEX AND

The Bond s standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80 passing 100 µm. If the breakage characteristics of a material remain constant over all size ranges the calcul ated work

Chat Online### QPEC Bond Index Mill Closeup View QPEC Bond Index Mill

and thereby the grinding mill size. Advantages The Quinn package grinding unit (Bond Index type) provides an automated system for testing the grindability of ores. Important features are 1. The grinding mill is 12" inside diameter by 12" inside length with radius corners to meet Bond specifications and for ease of cleanout.

Chat Online### RETSCHLaboratory Mills Crushers and Sieve Shakers

NEW Mixer Mill MM 500 vario The first mixer mill worldwide which accommodates 6 grinding jars or adapters RETSCH Laboratory Mills Crushers and Sieve Shakers RETSCH is the leading solution provider for neutral-to-analysis sample preparation and characterization of solids.

Chat Online### bond ball mill work index for pure quartz

A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s) Sample Requirements A minimum of 10 kg of material crushed to nominally minus 10 mm is preferred JKTech would stage crush the sample to minus 335 mm as required for the Bond Ball Mill Work Index test feed.

Chat Online### bond index for vertical millsnijhuisarchitectuur

The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave-shaped design At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill The Rod Mill Work Index (RWI) is used for particle size determination in a size range from 25 mm down to 21 mm whereas Ball Mill Work.

Chat Online### Bond Mobile Mill Work Index For Pure Quartz

A Bond ball mill work index is then performed on the mill product for the design of SAG-ball mill circuits. This is important because it was found that there was a 1–1.5 kWh/t higher ball mill work index if the –3.35 mm ball mill test feed size is obtained by SAG mill grinding

Chat Online### difference between ball milldifference between ball mills

difference between ball milldifference between ball mills. difference between grate and overflowing ball mill. wi the bond ball mill work index 1952is a measure of the resistance of the material to crushing and grinding bond ball mill work index test may be required for the design of a new mineral processing plant t is determined by bond ball mill grindability test in a lab using a bond mill

Chat Online### Clinker grindabilityPage 1 of 3

Nov 04 2013 · revolutions within a test mill that were required to produce a surface area of 350 m2/kg. The second was a breakability test which assessed the height that a steel ball must be dropped from to break a clinker nodule. I don t know if this testing is still available but it was useful when grinding

Chat Online### Hardgrove Grindability IndexWikipedia

As grindability depends on many unknown factors HGI is determined empirically using a sample mill according to the following procedure Procedure of measurement. 50 g of air dried coal featuring a grain size in the range between 0.6 and 1.18 mm are filled into the sample mill and a weight is put on the mill s grinding

Chat Online### Bond Tests Mining SGS

Bond F. C. "Crushing Tests by Pressure and Impact" Trans AIME Vol 169 1947 pp 58-66. Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bond s Third Theory of Comminution to calculate net power requirements when sizing ball mills . Various correction factors may have to be applied.

Chat Online### limestone grinding work index fred dakota net worth

Bond Ball Grinding Mill Work Index Mobile Crsuher Portable. Bond Grinding Work Index Of Indian Iron Ore 2 the operating work index (Wio) of an existing grinding circuit can be calculated given known mill power draw throughput feed and product size distributions. kWh/t = Power applied per ton of feed to the grinding.

Chat Online### andesite bond ball mill work indexciacademy

Note that the ball mill operating work index is applied only on the portion that needs the additional grinding (Q2) ball mill bond work index for limestone. limestone bond ball mill work index pdf . limestone bond ball mill work index pdf. A quick method for bond work index approximate value . Fulltext (PDF) The Bond work index is a measure of

Chat Online### bond method for ball mill work index test jamaica

Bond Work Index an overview ScienceDirect Topics. An alternative approach to determine the effect of closing screen size on the Bond ball mill work index BW i in the absence of extensive test work is to use computer simulation The batch grinding process has been modelled using the size–mass balance approach Austin 37 Chapter 11 and if we can do this then we can effectively simulate the Bond

Chat Online### Procedure for determination of ball Bond work index in the

1. Introduction. A Bond Ball Mill Work Index test is a standard test for determining the ball mill work index of a sample of ore. It was developed by Fred Bond in 1952 and modified in 1961 (JKMRC CO. 2006).This index is widely used in the mineral industry for comparing the resistance of different materials to ball milling for estimating the energy required for grinding and for ball mill

Chat Online### MODELING THE SPECIFIC GRINDING ENERGY AND BALL

2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALL-MILL SCALEUP Ball-mill scale up (Bond s Law)Data zBond work index w i zFeed D f and product d size (both 80 cumulative passing) Result The specific grinding energy w Mill power draw P = wT where T the mill capacity Mill dimensions (from Tables or charts)

Chat Online### Correlations for the Grindability of the Ball Mill As a

Bond s work index which is defined as the resistance of the material to grinding. The standard equation used by them for the ball mill work index (Bond work index) is as follows. / F 80 80 0.23 0.82 /10 44.5 1.1 GP W i bg i (4)

Chat Online