The median Bond ball mill work index and Bond rod mill work index will be similar for most projects, thought significant variation can manifest for any one particular sample. Relation of Bond ball mill work index and crushing work index. Rarely is there a relationship between the Bond ball mill work index and the Bond crushing (impact) …
The standard methods to measure resistance to grinding are energy–size relationships, such as the Bond work index. Due to the fineness of industrial cement, the Bond work index does not model accurately blends …
Bond´s equation have evidenced quite reliable for different grinding designs and reached an extensive acceptance to nowadays. Table 4 shows the Bond work indices for some …
In this study, a variability bysis is carried out with the Bond standard grindability tests on different critical metal ores (W, Ta), ranging from coarse grinding (rod mills) to fine grinding...
The ball mill values largely followed the Bond laboratory work index results, which were also obtained for each ore type. The AG/SAG operating work indices show their usual elevated levels ...
The traditional Bond work index proposed by F.C. Bond over 60 years ago is still today a useful tool for characterizing material crushability and grindability in the minerals industry.
The main objective of this study is to determine Bond's work index. For this purpose, from grinding tests, a phenomenological model and the population balance model (PBM) were obtained and combined to calculate the Bond's work index. Grinding kinetics tests for nonmetallic and metallic sample ores were used.
What is the Bond Work Index Formula-Equation? In case you had forgotten, here is a classic: What is the Bond Work Index Formula-Equation? ... From Eq. (16) and Table I, the ores tested (with an average specific gravity of 2.86) have an average crack energy of 4.0 joules per centimeter. Since the work input varies as the crack length, or …
Exposure time, power level, samples mass, particle size and the use of quenching with water were important variables affecting both the ore's Bond Work Index (Wi) and flotation performance.
The Bond low-energy impact test, also named impact work index or Bond impact crushing work index, can measure the crushing work index (CWI) and describes …
Table of Bond Work Index (2 replies and 1 comment) isqui. 6 years ago. ... The number from Fred C in 1961 was an average of 10 determinations and the Table has the rider that values can vary for the same material from different sources. ... I work in the Iron Ore industry and Wi can vary widely between ore types and even within the same pit. ...
The Bond ball work index is widely used in the field of minerals processing as an indicator of ore grindability. The work index is determined by means of a locked-cycle test procedure that typically requires seven to eight cycles to stabilise at a re-circulating load of 250%. A typical test requires
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.
Equally important is the need to represent, approximately, the correct size reduction in a comminution ... for typical ores (S.G. = 2.8g/cm3). Denser samples require more weight, proportional to the S.G. ... (Bond, 1947), and then the crusher work index (CWI) or …
The maximum difference in the Bond work index for the five tested gold ores was 11% (e.g. Whereas, an average interval between the two-sequence types of the tested ore was approximately 2.5%. (e.g. ).
This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on 'around the world sample'. You can find the SG of each mineral samples on the other table. Source 1: Table of materials reported by Fred Bond. Source 2: Outokumpu, The …
This research attempts to develop a methodology for assessing the efficiency of grinding operations as a function of rock strength properties and ore texture in relation to the Bond Work Index ...
Understanding your ore's variation of work index by size is particularly useful for SAG mill troubleshooting and production forecasting. Examples of the variation in work index at …
The Bond Abrasion Test determines the Abrasion Index, which is used to determine steel media and liner wear in crushers, rod mills, and ball mills. Bond developed the following correlations based on the …
comminution.9 Typically, Merensky ores are milled to about 60% passing 74 mi-crometers. When PGM prices are high, however, it is often good business to maximize revenue by milling at higher than designed capacities while sac-ing recoveries. Merensky ores have bond work indices of about 21 kW h/t at the coarser sizes and up to 25 kW h/t at the
The work indices are important for determination of crushing energy requirements and the abrasion index is important for estimating equipment metal wear and grinding media consumption. The hardness according to Mohs scale of Gibbsitic and Boehmitic bauxites are typically 1–3, while it ranges from 6½–7 for Diasporic bauxites .
The Bond work index (BWI) is a well-known method used when selecting comminution equipment, to evaluate the grinding efficiency and to calculate the required grinding power. ... devised an approximate procedure comparing the grindability data of an unknown ore with a reference ore whose grindability data are known and determined in …
The Bond- and the Hardgrove methods are widely used for the determination of brittle materials' grindability. Generally, the determination of the Bond work index of inhomogeneous materials can be carried out with high deviation using the conventional grindability apparatuses and methods, because of the highly different …
The higher the Work Index the more work required to crush the rock. The amount of energy required to do this work is important to understand to maximise efficiency.
The Bond work index (Bond, 1960) is based on Bond's law, which states that the energy consumed is proportional to the 1.5 power of particle size rather than the square of …
PLK (Partially Laterised Khondalite) rock is a general terminology used in this paper for those rocks which are in general associated in bauxite mining such as Partially Altered Khondalite (PAK) rocks, Partially Kaolinised Khondalite (PKK) rocks and Lithomerge. This paper deals with the Bond's work index, Hardgrove index and …
Bond work index studies were carried out for the BHQ and BHJ ores with different product fineness in order to evaluate the energy requirements in fine grinding. A higher Bond work index value was found for the BHJ ore (15.4 kWh/ton) than for the BHQ ore (12.4 kWh/ton).
The three tests are: The Bond ball mill work index (Wi BM, or BWi) conducted from a feed size of approximately 2 mm to a product size on the order of 100 µm. The Bond rod mill work index (Wi RM, or RWi) …
PDF | It is a well-known fact that the value of the Bond work index (wi) for a given ore varies along with the grinding size. In this study, a... | Find, read and cite all the research you need on ...
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.. Below describes in general terms the Bond Work Index …
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