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
WhatsApp: +86 18838072829Bond Ball/Rod Mill Work Index. Bond ball mill work index (BBMWI) test is a standard test used to measure the ball mill work, which is calculated in accordance with the procedure proposed by the Bond [21]. The BBMWI determines how much energy is needed to grind a sample of ore in a ball mill [22].
WhatsApp: +86 18838072829Rowland,, 1978, "Determination and use of operating work indices in controlled grinding circuitsA proposed concept," Mill Operator's Conference and Exhibit, Northwestern Branch, Australasian Institution of Mining and Metallurgy, Mt. Isa, Queensland Australia, June.
WhatsApp: +86 18838072829The voids (or interstitial space) within a rod load are approximately half those in a ball mill grinding load. Rods in place weigh approximately 400 pounds per cu. ft. and balls in place approximately 300 pounds per cu. ft.. Thus, quantitatively, less material can progress through the voids in the rod mill grinding media than in the ball mill ...
WhatsApp: +86 18838072829[Show full abstract] different characteristics of rod mill and ball mill, solving the grinding problem of difficult attrition bauxite. Compared with the traditional onestage grinding, the power ...
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WhatsApp: +86 18838072829The work index equation for a ball mill test was generated by Fred Bond to empirically predict the operating work index of an industrial ball mill (8 ft dia by 8 ft effective grinding length ...
WhatsApp: +86 18838072829Unrelated 'entertaining' image. The specification for the apparatus to determining a "Bond" rod mill work index is first described in Bond Maxton (1943). It states that the apparatus is a tumbling rod mill to be operated in a locked cycle test at a fixed circulating load. The geometry of the grinding chamber is described as: mill ...
WhatsApp: +86 18838072829Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements when sizing ball mills*. Various correction factors may have to be applied. The test is a closedcircuit dry grindability test performed in a standard rod mill.
WhatsApp: +86 18838072829This 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. Source 2. Source 3. Source 3. Source 4.
WhatsApp: +86 18838072829A quick method for Bond work index approximate value determination. D. Todorović Maja Trumić L. Andric V. Milošević Milan Trumić. Materials Science. 2016. 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 ...
WhatsApp: +86 18838072829A quick method for Bond work index approximate value determination. D. Todorović, Maja Trumić, L. Andric, V. Milošević, Milan Trumić. Materials Science. 2016. 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 ...
WhatsApp: +86 18838072829Technical Information. Information about sample size, calibration, precision and accuracy. The SMC Test® is the most widelyused comminution test in the world for AG SAG Mills, HPGRs and Crushers. The SMC Test® was developed to provide a range of useful comminution parameters through highly controlled breakage of rock samples.
WhatsApp: +86 18838072829for the rod mill and for the ball mill. The particle size distributions reported are shown in Figure 1. It follows that the No 1 rod mill/ball mill circuit was operating very efﬁ ciently when comparing the combined operating work indices for both mills with the rod mill and ball mill laboratory work indices.
WhatsApp: +86 18838072829The results showed that using the nonstandard mills (between 20 and 35 cm in diameter), the Bond´s model constants (α=; β=, and γ = ), are unable to predict the Work Index ...
WhatsApp: +86 18838072829Wr rod milling work index kWh/t Fb80 80% passing size for pseudo ball mill feed Pb Power for ball milling 10 1 110 1 80 **W (F b b − ).....(3) Wb rod milling work index kWh/t. The 110 is replaced by the actual finished ... 16,000µ for the rod mill and 4,000µ for the ball
WhatsApp: +86 18838072829use a rod mill F80 of 16,000 µm and a rod mill P80 of 1,000 µm. Note that—in order for no correction factor for ball mill product fineness to apply—the ball mill circuit P80 should be no less than approximately 70 µm (Bond, 1962). This Bond Efficiency determination should not be applied to cir
WhatsApp: +86 18838072829The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a predefined 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 stagecrushed to 100% passing size of < mm.
WhatsApp: +86 18838072829Use this online formula to calculate a Ball Mill, Rod Mill or SAG Mill Operating Work Index. Based on Fred Bond's work you can estimate the energy used into your grinding circuit. This is the most accurate and informative method, but much of the data necessary for its application is not yet available. A) Total Apparent Volumetric Charge ...
WhatsApp: +86 18838072829You need a twostage solution, first stage opencircuit mill and then second stage closedcircuit 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 (+ mm) and the Bond ball mill work index for the fine component ( mm).
WhatsApp: +86 18838072829• WiC Max The maximum crushing work index of a set of specimens, metric units. • Std Dev The standard deviation of crushing work index of a set of specimens, metric units. • WiC density The coarse particle density measured in a crushing work index test, t/m³. The `wirm` (rod mill work index) table includes the following fields:
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