bond s work index ball mill details specification

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 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

Bond Work Index Procedure and Method This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or finer feed ore samples. These equation application methods are used to process <1/2″ ore samples in a Ball Mill using a standard ball charge.

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 passing 6 mesh (3.35mm), from this a 700 cc volume was measured and weighed to be used as feed for the Bond Mill.

The Bond work index is one of the most useful and interesting parameters used in designing grinding equipment. However, it must be obtained under restrained conditions, especially in regards to the Bond standard lab mill. The main objective of this study is to show how this index can be obtained using a Denver ball mill, which is present in most mineral …

Page(s) Details of Revision : Approved: 23/4/08 All ... MOPU-1001-0A M-019SP Ball Mill Specification LIHIR GOLD LIMTED. EQUIPMENT SPECIFICATION NO. M018. SAG MILL GM2001. ... Work under this specification shall be performed in accordance with the above referenced codes and standards. In instances where national codes do not exist, materials and ...

Comminution Circuits – Featured Projects ANTAPACCAY. Southern Peru, 2009-2013 (108,000 tpd – 80,000 tpd) Predictions of mill throughput from a porphyry copper open pit based on comminution test results of 22 composites and the available motor power of a "Standard" SAG Mill/Ball Mill circuit consisting of one 40 ft dia. x 22 ft EGL SAG Mill rated at 24 MW GMD and …

Sheet 1 of 10 SPECIFICATION FOR STONE MASTIC ASPHALT SURFACE COURSE 1. The material shall be designed and manufactured to comply with BS EN 13108-5, this specification, Annex D of this appendix and with the requirements of Appendix 7/1 for the project concerned. BINDER 2. The binder shall be one of the following as specified in the project's ...

The Bond mill itself is made to the standard specification: 0.31 x 0.31 metres with an average ball charge size of 25 mm and total ball weight of 20Kg. Rotational speed is specified as 70rpm.

This is a SAG or AG mill model that estimates the specific energy consumption (E SAG) using the equations of Morrell (2004). Testwork Required. The SMC™ test, stored in the "DWT" testwork table (SMC is a Drop Weight Test). Bond ball mill work index. The method requires all the parameters of the ball mill work index test to be filled in:

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)

The specification for the apparatus to determining a "Bond" rod mill work index is first described in Bond & Maxton (1943). It states that the apparatus is a tumbling rod mill to be operated in a locked cycle test at a fixed circulating load. The geometry of the grinding chamber is described as: mill inside diameter of 12 inches

Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to give a P80 close to desired grind size.

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 ...

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.

Additionally, while techniques like the Bond Work Index and 'scale-up factors' are useful for coarse grinding, they can significantly underestimate grinding needs below 100 microns. Similarly, Tower Mill laboratory tests typically use much finer media than can be used in full scale operation and testwork is done in 'batch' mode.

However, Bond Work Indeces are related to the type of equipment to be used (rod mill, ball mill, SAG uses Drop Ball parameter-Kwhr/m3-, so it is more complex than just specific energy consumption ...

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%

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

Grinding at both Ball and Vertical Mills Dosage 0.03%–0.10% Mill Output Improvement upto 10% Recommended for both Ball and Vertical Mills Improved coal/ and Particle size distribution CEMAX RM – Grinding Aids for Raw Mill CEMAX CL – Grinding Aids for Coal Mill for Coal/Petcoke grinding Allow higher mill output for challenging situations

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.

Wi = The Bond Ball Mill Work index ( 1952 )- is a measure of the resistance of the material to crushing and grinding . A Bond Ball Mill Work Index test may be required for the design of a new mineral processing plant . It is determined by Bond Ball Mill Grindability test in a lab using a Bond Mill.

Test design Slide 12 Main purpose Maximum Capacity Cost low Energy Size Division Less fines Production Bond's work index 13. Test design Slide 13 Effect of circulating load on Bond's work index The follow figures shown variation in the Bond work index with test sieve size as test results[7].

This ball mill is typically designed to grind mineral ores and other materials with different hardness, and it is widely used in different fields, such as ore dressing, building material field, chemical industry, etc. Due to the difference of its slurry discharging method, it is divided to two types: grid type ball mill and overflow type ball mill.

= Bond laboratory ball work index (kWh/tonne) P. 1 = closing screen size in microns . Gbp = net grams of screen undersize per mill revolution . P = 80% passing size of the product in microns . F = 80% passing size of the feed in microns . Circuit Equipment Configurations – Although the model can be used for a very wide range of

in general is the Bond Work Index which uses a pilot scale wet ball mill. This covered a very wide range of values but was apparently not precise enough for use with coal. It also used a slurry sample which was inappropriate for coal for pulverized combustion. Numerous other grindability tests have been proposed but have failed to win acceptance.

This video was put together by Joshua Wright and Aldo Vasquerizo as a supplemental lecture for University of Nevada Reno.If you have any questions, need advi...

The Bond_Op. Work Index spreadsheet was designed to estimate the Operational Work Index of a given grinding installation of known dimensions and operating conditions, based on the traditional Bond's Law and the Hogg & Fuersteneau Power Model (see Mill Power_Ball Mills spreadsheet for further details on such model).

handbook for ball mill grinding pdf. work index series (ball mill, rod mill, and. MacPherson few kilos of material on several samples, is a more typical approach to grinding mill design. ... is to. Contact Us. Basic Operation of Manual Mill. Jun 7, 2013 load tools and perform a basic milling operation using the ET manual mills. Basic Operation ...

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