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 passing size of <3.35 mm.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 processing laboratories. The …

Following sample homogenization, a 10 kg sub-sample was rotary split for Bond mill work index testing (BWI) and the remainder was crushed to passing 10 mesh. Following sample homogenization, each sample was further rotary split into a 10 …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 [Bond 1961].

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.Bond mill work index averages 12.0 kWh/st for the 40 samples, and the Starkey SAG mill grindability test gave an average result of 67 minutes. Hardness for SAG grinding is comparable to similar orebodies in Chile, whereas ball mill hardness is slightly lower. Flotation

Bond Grinding Circuit Efficiency - ceecthefuture. Mill Ball Mill Closed circuit crushing to 16 mm Open circuit 8' dia. rod mill to 1 mm Closed circuit 8' dia. ball mill to P80 um The ore Test Work Index = Circuit Operating Work Index 9 The Standard Bond Circuit Coarse Ore Bins Fine Ore Bins Screen Crushing Screen Classification Rod Mill Ball Mill THIS IS THE REFERENCE BASIS FOR ...Ore characterization tests on drop weight, bond mill work index, abrasion and crushability were conducted at the laboratories during 2019 and …

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 ...The aim of this study was to develop a new method for assessing the Bond work index in a ball mill (BBWI), which is based on a first order kinetics present in the Bond ball mill for grinding mineral raw materials (Austin et al., 1981; Ahmadi and Shahsavari, 2009). Theoretical basis of quick procedure

The grindability of an ore in the process of mineral dressing can be determined by use of the Bond work index (W i).This index is determined on a laboratory-scale using a Bond ball-mill and by simulating dry grinding in a closed circuit until the 250% circulating load has been obtained.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.

The Bond lowenergy 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 'perspecimen' test where individual specimens of prepared rock are handpicked by the test operator and placed into the apparatus.A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample requirements: A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred. JKTech would stage crush the sample to minus 3.35 mm, as required for the Bond Ball Mill Work Index test feed.

You need a two-stage solution, first stage open-circuit mill and then second stage closed-circuit mill. First stage, will be broken into two parts as well, you use a Bond rod mill work index for the coarse component of the ore (+2.1 mm) and the Bond ball mill work index for the fine component (-2.1 mm).SMC Data Processing. The results from conducting the SMC Test® are used to determine the drop-weight index (DWi) which is a measure of the strength of the rock as well as the comminution indices Mia, Mih and Mic. In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of ...

An analysis of the results shows a direct relationship between the Bond work index and the Denver work index when the Bond test is defined adequately to the Denver lab mill. Read more ArticleThe average Bond mill work index of the 12 composites tested was 14.5 kWh/t. "These results provide very strong support for an improvement on the more conservative recovery estimates employed in our PEA of 92%, and are very much in line with the higher recoveries realized from 36 years of continuous historical production at Madsen1," states ...

The bond work index test obtained high work index 52.60 kw.h/t and consumed power 11.72 kw.h/t to grind one ton of low grade iron ore and this attributed to the high concentration and hardness of ...Standard Bond Ball Mill Grindability Test Methodprocedure. 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 ...

Bond Work Index. A standard 12″ × 12″ laboratory Bond ball mill was used to conduct the work-index experiments. About 50 kg of each of the BHQ and BHJ samples was prepared in −3.35 mm size by a jaw crusher followed by a roll crusher. Size analysis results for the crushed products of the BHQ and BHJ samples are shown in Fig. 1.Comminution testwork was also initiated with Bond Mill Work index rate tests completed on 3 ore zone composites. An average work rate of 14.8 kWh/t was determined for …

Bond S Rod Mill For Work Index - Mc World. Bond work index - an overview sciencedirect topics. the rod mill work index laboratory test is conducted by grinding an ore sample prepared to 80% passing 12.7 mm ( inch, the original test being developed in imperial units) to a product size of approximately 1 mm (in the original and still the standard ...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.

BOND WORK INDEX The Bond Work Index of a material of its hardness or its resistance to crushing or grinding. This is sometimes referred to as the HandgroveGrindability Index based on the design of the rod mill. Objective: The experiment aims to familiarize the students with the procedure for the determination of the Bond Work Index of a given ore.Data were developed form the bond mill work index, gold and tungsten flotation, conventional and high-rate thickening, cyanide leaching, and cip adsorption tests. Publication Date 19890101

The grindability of an ore in the process of mineral dressing can be determined by use of the Bond work index (Wi). This index is determined on a laboratory-scale using a Bond ball-mill and by ...Bond Mill work index tests were also performed on 04 June 2014 for Anthracite coal: - For the model C1 - SGS and UMG test report A - anthracite coal RELO C1Bond MIll 04.06.2014.pdf - For the model C1 - SGS and UMG test report B - anthracite coal RELO C1 Bond MIll 04.06.2014.pdf

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 materials (calcite, magnesite, labradorite (feldspar), quartz, andalusite and glass) using closing screen apertures (P 1 ) values of 500, 250, 125, 90 and ...Bond Work Index - an overview | ScienceDirect Topics