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. ).
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 work index most commonly referred to is the BBM work index. This value is obtained in a 12" × 12" laboratory mill running at 70 rpm, with rounded …
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
In general, Bond's work index is used to determine the grinding efficiency and also to calculate the power requirement. The process is very time consuming and it requires skilled labor and specialized mill. A systematic investigation was carried out to predict Bond's work index using simple field measurable properties of rocks.
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...
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 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 (ball mills). The relationship between wi and grinding …
Bond's work index is one of the mostly widely used metrics of mineral grindability. In spite of its ubiquity, users are often not aware of the nuances of the work index family: what are...
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) …
The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial ...
The brittleness indices of the ores were calculated using the chemical composition of the gangue, and a good correlation between brittleness indices and Bond work indices was observed, which ...
Evaluating the comminution energy requirements of ores using traditional Bond work index testing is well established; such testing is conducted on essentially all development properties, and is widely used as a benchmark for plant performance.
The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial ...
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 ...
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 …
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 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 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 …
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 …
From a practical point of view, the work index is divided into ball milling work index (the short form of Bond ball milling work index), rod milling work index, and crushing work index. The corresponding methods of test and determination with a small amount of ore samples in the laboratory are put forward, too.
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 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 .
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 ...
Download scientific diagram | Correlation of crushing work index and drop-weight index. from publication: What can go wrong in comminution circuit design? | | ResearchGate, the professional ...
Dawson Metallurgical Laboratories, Inc. • SAGDesign (SAG to T80 12 M followed by Bond BM Wi on SAG ground ore) • Bond Ball Mill Work Index (Crushed Feed) • Specific Gravity (part of the SAGDesign test).
This test is an effective way to calculate and compare the Bond Work Index (BW¡) of different ores. The higher the Bond Work Index, the more difficult it is to grind the material. This procedure is important to mineral processing industries as it helps to determine the proper equipment necessary for grinding by estimating the power and energy ...
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 ...
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. ...
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 …
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 …