You 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 18838072829The mill product can either be finished size ready for processing, or an intermediate size ready for final grinding in a rod mill, ball mill or pebble mill. AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill.
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 18838072829Key words: Comminution, Bond work index, Grinding, Crushing, Ball mills, Rod Mills. Theoretical efficiency
WhatsApp: +86 18838072829Ball Mill Work Index has been widely used for ball mill sizing, and is also utilized in computer simulation. BOND ROD MILL GRINDABILITY TEST The Bond Rod Mill Grindability Test is also performed according to the original Bond procedure. It requires 15 kg of minus ½ mesh material that is preferably prepared at the testing facility. The Bond Rod ...
WhatsApp: +86 18838072829There are three variants of this test; crushing work index, rod mill work index, and ball mill work index [2]. In this review, only the ball mill work index will be discussed, since ball mills are the only equipment of the three that are capable of significant degrees of fine grinding. The ball mill standard grindability test utilises a ...
WhatsApp: +86 18838072829The 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 methodology ...
WhatsApp: +86 18838072829Ball Mills or Rod Mills in a complete range of sizes up to 10′ diameter x 20′ long, offer features of operation and convertibility to meet your exact needs. They may be used for pulverizing and either wet or dry grinding systems. ... The parameter Wi, known as the work index of the ore, is obtained from batch bench tests first devised by ...
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:
WhatsApp: +86 18838072829Typically R = 8. Rod Mill Charge: Typically 45% of internal volume; 35% 65% range. Bed porosity typically 40%. Height of bed measured in the same way as ball mills. Bulk density of rods = tons/m3. In wet grinding, the solids concentration 1s typically 60% 75% by mass. A rod in situ and a cutaway of a rod mill interior.
WhatsApp: +86 18838072829A screen analysis down to 3 mesh is also made. Bond Impact, grindability tests, and abrasion index tests are also run on the sample. Rod mill grindability tests for Work Index are run at 10 or 14 mesh, and ball mill Work Index tests are run at the desired grind if finer than 28 mesh.
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 18838072829To calculate the Bond work index ( Wi) in a standard laboratory scale rodmill, Bond derived the following equation: (1) W i = 62 P i G i 10 P 10 F kw h sh t where F is 80% passing size of original feed, P is 80% passing size of circuit product and Pi is the testsieve size in μm [1].
WhatsApp: +86 18838072829A 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 mm, as required for the Bond Ball Mill Work Index test feed.
WhatsApp: +86 18838072829The operational work indices: W~oR for the rod mill and W~oBj for each ball mill hydrocyclone section are given by (Rowland, 1973)" PeR PeBj W,oR = Gz Gkj FrR k# P~o FrB k8o~ Pso~ Commution, Classification and Agglomeration C43 Here FTR and FTB are particular application and equipmentrelated factors, depending on the ...
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 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 passing size of < mm.
WhatsApp: +86 18838072829Rod mills generate small amounts of fines, as fine particles typically accumulate in the space between rods without enduring comminution [2]. Effective grinding of this material occurs in the ball mill compartment, generating finer fragmentation. The Bond Rod Mill Work Index (BRMWI) test was only possible for Blend 5 (Table 2) due to excessive
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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 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
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