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.

3- STANDARD BOND TESTS 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

Limestone Bond Ball Mill Work Index Pdf Sand Making . correlation between bond work index and. the bonds standard ball mill is used to determine the work index value of differ ent samples the bond work index is defined as the kilowatthours per short ton required to break from infinite size to a product size of passing 100 if the breakage ...

Lab Ball Mill For Sale Solutions Just Right For You. Ball mills media Reset Filters Shop by Price Availability In Stock Out of Stock Ball mills media Product Compare 0 Show Sort By -12 Ball mill 17LB All New Heavy Duty Stainless Steel Tumbler This stainless steel tumbler is comparable t 249 00 219 00 Add to Cart Add to Wish List Compare this Product Ball mill 3 Lb capacity 3 lb …

The Bond Index conforming rod charge consists of: 6 rods of 1.25" diameter and 21" length. 2 rods of 1.75" diameter and 21" length. 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.

Rapid Determination Of Bond Rod-mill Work Index By. to calculate the bond work index (w i) in a standard laboratory scale rod-mill, bond derived the following equation: (1) w i = 62 p i 0.23 g i 0.625 10 p-10 f kw h sh t where f is 80% passing size of original feed, p is 80% passing size of circuit product and p i is the test-sieve size in μm .

Bond Work Index Procedure and Method. ... bond grindability index ball mill size specification. 18th Relationships Between Bond's Grindability (G ) and . laboratory ball mill under standard conditions, and also the relationship between Bond's grindability and breakage parameter values of limestone samples. 2 THEORY When breakage is occurring in ...

Grindability Index Test Method & Procedure - 911Metallurgist The proposed grindability test uses the Bond standard test mill and a .... Energy required For grinding: comparison of plant data, estimates based on the Bond Work ...size to another. it can be expressed in different ways, the best known being the ... in a laboratory hatch ball mill, and the times required for each …

This is empirical index determined by closed circuit grindability tests developed by F.C.Bond in the mid 1930's. It requires a specific 305mm diameter x 305mm long (inside dimensions) horizontal axis ball mill without lifters operating at 70 rpm to perform grindabilities from 28 to 500 mesh.

PDF A quick method for bond work index approximate . Quick method for bond work index approximate value determination 331 The newly formed undersize mass for the first is defined in a Bond ball mill on the samples of standard size − 3 327 0

1. BALL MILL AIM: To determine the energy required for crushing the given feed and thus obtain the work index for the same. Also determine the reduction ration and critical speed of the mill. THEORY: The ball mill is classified as an intermediate and fine grinder where the action of the grinding is based on impact and attrition.

Axb: JK Drop Weight Test ore hardness index BBMWi: Bond Ball Mill Work Index C i: Crushing parameter COV: Coefficient of variation DWi: Drop Weight Index DWT: Drop Weight Test E: Young´s modulus of Elasticity Ecs: Specific Comminution Energy E is: Specific input energy F 80: 80% of the feed passing : Proprietary function

Ball Mill Specifications ... The parameter Wi, known as the work index of the ore, is obtained from batch bench tests first devised by Bond (1961). The power calculated on using equation 1, (Bond, 1961; Rowland and Kjos, 1978), relates to:

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

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

BOND WORK INDEX The Bond Work Index is a factor that measures the energy consumed in size reduction operation of the ore. The Bond's Work Index equation is: W=WI* (10/√P80 -10/√F80) where W= the energy input (Work input) per ton, kwh/metric ton WI= Work Index= specific energy per ton, kwh/metric ton (characterizes the ore)

Quantity of Wet Ball Mill System 2 No's (1 working + 1 standby)- common system 2 Parameters WBM Design Capacity 11.8 TPH Media to be Handled Limestone Limestone Analysis Refer Clause No. 6 Design Bond Work index 13 KWH/Short ton. Bidder Sign and Seal ... This specification covers the minimum requirements for the complete design, material ...

The Bond ball mill grindability test is run in a laboratory until a circulating load of 250 is developed It provides the Bond Ball Mill Work Index which expresses the resistance of material to ball milling This happens after 7–10 grinding cycles which shows that the procedure is a lengthy and complex one and is therefore susceptible to

ball mill bond work indeand for limestone: limestone bond ball mill work - marbox.pl. Limestone Bond Ball Mill Work Index Pdf Sand Making . correlation between bond work index and. the bonds standard ball mill is used to determine the work index value of differ ent samples the bond work index is defined as the kilowatthours per short ton required to break …

Bond's mill specification and grinding conditions . ... Kinetic grinding test approach to estimate the ball mill work index, Physicochem. Probl. Miner. Process., 52(1),342-352. ...

The mill dimensions, (D × L), are 0.204 × 0.3 m and it is loaded with 8.55 kg steel rods 14 to 20 mm diameter. The mill rotates on rolls and its frequency is set to 70 RPM corresponding to 85% of the critical frequency. The mill power is = 22.5 Watts, calculated by (6). Fi- P nally the product is wet screened to find the size d80. 2.4.

Ball Mill. The ball mill is a tumbling mill that uses steel balls as the grinding media The length of the cylindrical shell is usually 1–1 5 times the shell diameter Figure 8 11 The feed can be dry with less than 3 moisture to minimize ball coating or slurry containing 20–40 water by weight

First, a Jar Mill grindability test requires a 5 lb. (2 kg) sample and produces a direct measured specific energy (net Hp-hr/t) to grind from the design feed size to the required product size. The second test, a Bond Work Index determination, results in a specific energy value (net Hp-hr/t) from an empirical formula.

The Work Index (BWi) is calculated according to Fred Bond's Equation. Bond Work Index for Testing Procedure Cleaning and Storing of Ball Mill Charge after the Bond Work Index Procedure is done: Add about 500 g of silica sand into the mill containing the ball charge. Seal the mill. Rotate for 20 revolutions to clean.

Test WI of circuit feed ore = 16.1 kWh/t (The Bond ball mill test Work Index of the ore, whichapplies over the size reduction range of this circuit) W = 3,150 kW / 450 t/h = 7.0 kWh/t . The circuit's Bond WI Ratio Eff. = 16.1 / 14.4 = 1.12, or 112%

The experimental execution conditions of the standard Bond test, together with the 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

At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill.P80 of Bond ball mill Work Index tests, The laboratory procedure for running a Bond ball mill work index test requires that the operator choose a closing screen sieve size. The instruction is to . More

Work Index Ball Mill, alluding to the grind ability list of Metals, is utilized to demonstrate the granulating trouble of the material. It is measured by a rule that to compute the work file ball plant in light of yield of every unrest of the factory after the material is ground to an adjusted state by the predetermined plan.

ball mill operatng work index calculation. ball mill operatng work index calculation ball mill calculation . ball mill for work index test. Diameter of balls (mm) 38.1 31.75 25.4 19.05 15.87 Number of balls 13 20 3 21 28 Besides the results of work index tests are accordingly implemented in Equation 5 to calculate the ore work index values.