The Bond ball mill work index test is thought to be additive because of its units of energy; nevertheless, experimental blending results show a nonadditive behavior. [18] The SPI(R) value is known not to be an additive parameter, however errors introduced by block kriging are not thought to be significant .

work index covering grinding of fine particles is labelled M. ib (Morrell, 2008). M. ia. values are provided as a standard output from a SMC Test ® (Morrell, 2004. a) whilst M. ib. values can be determined using the data generated by a conventional Bond ball mill work index test (M. ib. is NOT the Bond ball work index). M. ic. and M. ih ...

Bond Index Ball Mill / Rod Mill BT 100 XL. The Bond's grinding coefficient for different materials can be found in various literature, W is the work index measured in a laboratory ball mill nducted upon Gold Ore Samples from the Mt Todd Project Feasibility Study, 812 Bond Ball Mill Work Index Determination 35The Bond Index Ball Mill / Rod Mill BT 100 XL is used in the planning of crushing ...

Laboratory Milling – Rod / Ball Mills including Bond Rod / Ball Work / Grindability Index. MARC manufactures a wide range of laboratory ball / rod mills and automated Bond rod / ball mills (with wave liners) to suit most metallurgical laboratory appliions.

Bond ball mill work index tests were also completed on each sample. Bond ball mill work index values ranged from to kWh/tonne. The two Sulphuret samples had the highest Bond ball mill work indices at and kWh/tonne. Horizontal mills InfoMine

14/12/2015 · Here is the old AllisChalmers Bond Work Index Grindability Test Procedure. The standard feed is prepared by stage crushing to all passing a 6 mesh sieve, but finer feed can be used when necessary. It is screen analyzed and packed by shaking in a 1000cc graduated cylinder, and the weight of 700 cc is placed in the mill and ground dry at 250 per cent circulating load.

10 mm), the crushing work index SWI is applicable; for medium size particles (from 100 mm to 2100 μm) — rod milling work index RWI; for finer particles — ball milling work index BWI (Table). These indexes are readily obtained using the specialpurpose laboratory equipment (Fig. 1). Finding the total specific energy consumption

Laboratory Milling – Rod / Ball Mills including Bond Rod / Ball Work / Grindability Index. MARC manufactures a wide range of laboratory ball / rod mills and automated Bond rod / ball mills (with wave liners) to suit most metallurgical laboratory appliions.

18/12/2013 · where W is the specific grinding energy (kWh/t), W i is the Bond ball mill work index (kWh/t), F80 is the feed 80 pct passing size (μm), and P80 is the product 80 pct passing size (μm). It can be seen that in the regime in which the Bond equation is valid, energy use increases exponentially as product size decreases with constant feed size, with an exponent .

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 ...

Bond Work Index an overview ScienceDirect Topics. The ball mill work index laboratory test is conducted by grinding an ore sample prepared to passing mm (6 mesh) to product size in the range of 45150 µm (325100 mesh), thus determining the ball mill work index .

Bond Work Index an overview ScienceDirect Topics. Ball mill design requires a Bond work index, BWi, for ball mills at the correct passing size; SAG mill design requires an appropriate SAG test, for example, SPI (Chapter 5) Flotation design needs a valid measure of kinetics for each sample, including the maximum attainable recovery and rate constants for each mineral ( .

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, ...

6/07/2021 · The first program, conducted in 2014, focused on determining the most viable processes for extracting gold from the ore, including bond ball mill work index, gravity gold recovery, flotation and ...

Bond's approach consists of determining the ore hardness characteristics, or Work Index (Wi) via standardized laboratory testwork. The full suite of Bond comminution tests provide the Ball Mill Work Index (BWi), the Rod Mill Work Index (RWi), the Crusher Work .

Numerically, the work index is the energy required in kwh/t to reduce a given material from theoretically infinite feed size to 80% passing 100 microns. The work index of a particular material is determined in the laboratory by conducting the standard Bond grindability test. Bond developed separate tests for the rod mill and the ball mill.

Bond Index Ball Mill Rod Mill Bt 100 Xl Retsch. The Bond Index conforming ball charge consists of 43 x 145 balls 67 x 117 balls 10 x 1 balls 71 x 075 balls 94 x 061 balls The optimum number of grinding balls is 285 However the ball diameters vary due to wear Therefore the total ball number should be adjusted from time to time to ensure a total mass of 20125 grams The grinding jar of the Bond ...

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 'lockedcycle' test where ground product is removed from test cycles and replaced by fresh feed.

The work index . W. i. was defined by F. Bond as the specific energy (kWh/ton) ... Ball Mill Batch Process The mill dimensions, (D × L), are × m and it is loaded with kg steel balls between 25 and 32 mm in diameter. The mill rotates on rolls and its frequency is

First, a Jar Mill grindability test requires a 5 lb. (2 kg) sample and produces a direct measured specific energy (net Hphr/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 .

21/08/2021 · The guideline reviews the data required for the analysis, including hardness characterization data generated from the SMC Test® and Bond Ball Mill Test Work Index, presents the Morrell equations and their appliions, and provides a worked example.

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 Bond Ball Mill Grindability The sample was crushed to passing 6 mesh (), from this a 700 cc volume was measured and weighed to be used as feed for the Bond Mill.