Bond Work For An Ultrafine Mill-GOLD MINING

MINING

QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE VALUE DETERMINATION

micrometers in size. According to the Bond standard procedure the work index is determined by simulating a dry grinding in a closed circuit in the Bond ball mill to achieve 250% circulating load Bond 1949 1952 1961 . The test is performed on a material approximately weighing 10 kg which coarseness is 100% -3.327 mm.

Simulating the Bond rod mill grindability test Request PDF

The model was validated for four materials showing that it can predict the Bond rod mill work index with deviations below 10%. Requiring only 1.5–3kg of sample the procedure is demonstrated to .

bond ball mill work index customer case

bond ball mill work index customer case. The bond work index is a measure of ore resistance to crushing and grinding and is determined using the bond grindability test its value constitutes ore characteristic and is used for industrial comminution plants designing determining the bond work index value is quite compli ed timeconsuming and requires trained operating personnel and therefore is .

Bond Work Index Tests - Grinding Solutions Ltd

The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits. The test requires a minimum of 10kg of sample that has been stage-crushed to 100% passing size of <3.35 mm. Any screen size below 600µm can be used for the testwork depending on your requirements. Bond Rod Mill Grindability Test

Bond Work Index Tests - Grinding Solutions Ltd

The Bond Ball Mill Work Index BBWi test is carried out in a standardised ball mill with a pre-defined media and ore charge. The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits The test requires a minimum of 10kg of sample that has been stage-crushed to 100% passing size of <3.35 mm.

Bond Work Index - an overview ScienceDirect Topics

The ability to simulate the Bond work index test also allows examination of trun ed ball mill feed size distributions on the work index. For grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill see Figure 3.10 a question arises as to whether this practice will alter the ball mill work index BW i of the material .

Bond Work Index Formula-Equation

Metallurgical ContentBasic EquationsSize Distribution and Exposure RatioEquations for Work Index VariationsWork Index and Crack Energy 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 .

bond rod mill work modified - ristorante-stazione.ch

bond ball mill work index determination. Limestone Bond Ball Mill Work Index. The grinding jar for the Bond Index Rod Mill is 12 x 24 in size and has a waveshaped 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 mmget price

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4 BWI = 1.1 × 44.5 P i 0.23 × G p r 0.82 × 10 P 80-10 F 80 where BWI is the Bond work index; P i the opening sieve size; Gpr the grams produced per revolution; P 80 80% passing size of product; and F 80 80% passing size of feed. For limestone samples Eq. was applicable but for the sandstone samples a different approach was used to .

20150505 Bond Efficiency-GMG-ICE-v1-r04 Determining the Bond .

Where WioACTis the Actual Operating Bond Work Index kWh/t W is the specific energy input kWh/t P80 is the 80% passing size of product µm and F80 is the 80% passing size of circuit feed µm . 2. Calculate the Standard Circuit Bond Work Index WiSTD for the material being processed equation 3 . Wtotal

Testwork: Bond ball mill work index - SAGMILLING.COM

The Bond ball mill work index is one of the most commonly used grindability tests in mining and is often referred to as the Bond work index.. The test is a & 39;locked-cycle& 39; test where ground product is removed from test cycles and replaced by fresh feed.

Bond Index Ball Mill / Rod Mill BT 100 XL - RETSCH

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 Index BWI is used for the range from 2.1 mm down to 100 µm. Adjustment of grinding parameters:

GMSG GUIDELINE: DETERMINING THE BOND EFFICIENCY OF INDUSTRIAL .

Bond Test WI’s kWh/t : Rod Mill: Ball Mill: 9.5 kWh/t.8 9 kWh/t . Bond Standard Circuit Work Index: Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19300 mµ although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16000 m to a rod µ

Comparison of UCS to Bond Work Indices

FIGURE 5: BOND ROD MILL WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS MPa 5 10 15 20 25 30 35 WiRM metric The lack of fit observed relating the crushing Work Index was expected to carry over to the other Bond Work Indices. Figure 5 displays the plot of rod mill Work Index Wi RM versus UCS. These

AMIT 135: Lesson 8 Rod Mills – Mining Mill Operator Training

D = mill diameter in meters. The Marcy expression is applicable for mill diameters between 1.52 to 4.1meters. Using peripheral speed the rotational speed can be determined. Bond quantified the rod mill power draw as a function of the Work Index capacity and a series of correction factors: PM = Wmtesti FT Q. FT = F1 F2 F3 F4 F5 F6

Bond Tests 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.

Testwork: Bond rod mill work index - SAGMILLING.COM

The Bond rod mill work index is not as common as the Bond ball mill work index and there are two different variations on the mill apparatus.The SAGMILLING.COM models expect a mill with a "wave liner" and is not compatible with mills using "smooth liners".

Bond Work Index Report Matrix House

The Work Index is used when determining the size of the mill and grinding power required to produce the required ore throughput in a ball mill. 2. Procedure 2.1. Bond Ball Mill Grindability The sample was crushed to 100% passing 6 mesh 3.35mm from this a 700 cc volume was measured and weighed to be used as feed for the Bond Mill.

PDF A quick method for bond work index approximate value .

The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial .

Comminution - Wikipedia

For comminution of finer particle size ranges 20mm > P 80 > 30 μm machines like the ball mill vertical roller mill hammer mill roller press or high compression roller mill vibration mill jet mill and others are used. For yet finer grind sizes sometimes referred to as "ultrafine grinding" specialist mills such as the IsaMill are used.

Small-Scale Tests to Characterise Ore Grindibility

BOND ROD MILL GRINDABILITY The Bond rod mill grindability test is performed similarly to the ball mill test. The feed sample is stage-crushed to ½” 12.5mm and the test is run under a 100% circulating load. The test can also be closed with various sieve sizes but for AG/SAG mill analyses the standard 14-mesh 1.18mm sieve is typically used.

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Bond Work For An Ultrafine Mill