to include SAG and Ball milling. The hardness of each sample was measured in terms of SAG power index, SPI (for SAG grinding) and Bond Ball mill work index, BWi (for ball mill grinding). A further measure, the Minnovex crusher index, Ci was also measured for use in the CEET program to determine SAG mill feed size (Kosick and Bennett, 2001).

Essa® Bond Test-Work Equipment. Internationally accepted mineral metallurgical standard test procedures to determine the physical properties of ores include the Bond ball mill work index and the Bond rod mill work index. These are empirical indices determined by close circuit grindability tests developed by F.C.Bond in the mid 1930's.

However, upon close inspection of Bond's original paper published in 1949, Bond stated that the net energy input to the laboratory scale ball mill was 93 J/rev which is comparable to the digital ...

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

Bond Ball Mill Index Test Jktech. The Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a ball mill. It can be used to determine the grinding power required for a given throughput of material under ball mill grinding conditions. Details

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.

For overflow ball mills, the charge should not exceed 45% of the mill volume . For grate discharge mills, the charge should occupy about 50% of the mill volume . Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge, He, and the radius of the mill, R, i.e.,

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

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 …

laboratory ball mill. if the mill diameter is greater than 3.81m. The cylindrical . Feed Characteristics . The laboratory ball mill was designed for grinding limestone, meaning that the work index required for the specific power calculation was assumed to be the work index of limestone, which is 11.6 KWh/t, with a specific gravity of 2.6 g/cm. 3

technical data of ball mill from brazzaville. Technical Specification Of Ball Mill. ball mill technical specification,ball mill technical data, Ball mill is a key equipment for regrinding It is widely used in the mining, new type building material, glass, ceramics and etc According to different forms of discharging materials,it can be divided into tabular type and flowing type .

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 ...

and its correlation. As a fast method, the determination of the Bond index from the Hardgrove index (by calculation) is almost matching with measured Bond's work index. The Bond's work index of the above rock samples calculated from the Hardgrove index value has …

Bond Work Index Formula-Equation

It is structured as a specification and can be included in mining companies' tender documents to mining vehicle original equipment manufacturers (OEMs). ... including hardness characterization data generated from the SMC Test® and Bond Ball Mill Test Work Index, presents the Morrell equations and their applications, and provides a worked ...

The Bond work index determination according to the standard Bond's test is done on all these samples with compara-tive sieve size of 74, 105 and 150 microns. The Bond Work Index is calculated using the formula (Bond, 1961): (√ √) (1) where: W i – Bond work index (kWh/t); P c – test sieve mesh size (µm);

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 …

Ball mill charge size distributions originally specified for Bond grindability tests to determine the Bond Work index (BWi) are not commercially available. Those proposed to date do not match all of Bond's (1961) original specifications of total ball mass, number and surface area.

Essa® Bond Test-Work Equipment. Internationally accepted mineral metallurgical standard test procedures to determine the physical properties of ores include the Bond ball mill work index and the Bond rod mill work index. These are empirical indices determined by close circuit grindability tests developed by F.C.Bond in the mid 1930's.

An alternative mill ball charge is proposed that closely approximates Bond's original total ball mass, number of balls and ball surface area. Results of 30 Bond Work index tests of six pure ...

To find mixing index. 5. To determine Critical index, Work Index, Bond's Law, Rittinger's Law and Kick's Law for Ball mill. 6. To determine the scr een efficiency for the given sample. 7. To determine Rittinger's constant, Bond's constant, Kick's constant and Work Index. To determine nip angle, Reduction Ratio, Ribbon Factor, 8.

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).

This ball mill, also called mill for measuring bond work index, is a key device for measuring grinding work index. It is widely used by teaching and researching departments for grindability test. Specifications: Mill Linings. Ball and Pebble Mills may be lined with rubber, ceramic and wear resistant metallic liners. Grinding Media.

A new Bond Work index ball charge is tested to substitute for Bond's specifications. • This charge approximates specified total ball mass, number and surface area. • Closing screen size (P 1) determines the 80% size passing of fines produced (P 80). • BWi test P 80 values are shown to correlate to P 1 values with an R 2 ≥ 0.9977. •

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

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 …

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 ...

• WiRM – The Bond rod mill work index determination, metric units. The rod mill work index table includes results from laboratories whose apparatus does not conform to Bond's original specification. The most significant deviation is several laboratories in Australia use a mill without a wave liner – the liner specified by Bond.

This test determines the Bond Ball Mill Work Index, which can be used with Bond's Third Theory of Comminution to calculate net power requirements for sizing ball mills. The test is a closed-circuit, dry grindability test is run in a standard ball mill, and can be performed at sizes ranging from 595 mm to …

The Bond low-energy impact crushing work index (more informally, the Bond crushing work index) is not as common as the Bond ball mill work index, and it is a notoriously noisy test.. The test is a 'per-specimen' test where individual specimens of prepared rock are hand-picked by the test operator and placed into the apparatus.

Alsto ball mill a complying machine with the appropriate barrel and ball charge. The Bond Index Ball Mill is supplied standard with a barrel and rotating yoke assembly and the electric motor drive; with a standalone bench, funnel and screen.

Bond Ball Mill Index Test JKTech. 29 ensp 0183 ensp The Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a ball mill It can be used to determine the grinding power required for a given throughput of material under ball mill grinding conditions It is a locked cycle test conducted in closed circuit with a laboratory screen

The ability to simulate the Bond work index test also allows examination of truncated 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 ...