Generally Bond work index for mill dimensioning and controlling is measured by grinding a feed material of less than mm (− 6 mesh) particle size under standardized conditions in a Bond's mill (Diameter × Length = 305 mm × 305 mm). Bond's method simulates closedcircuit grinding which is carried out in sections until the establishment ...
WhatsApp: +86 18838072829The Bond rod mill grindability test is a widely used tool to estimate the response of ores to rod milling. However, the mass of ore required to conduct the test, which can typically vary from about 8 to as much as 20 kg, may represent a challenge when sample availability is critical. The present work proposes an alternative procedure, which is ...
WhatsApp: +86 18838072829In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of circuits containing: • AG and SAG mills. • Ball mills • Rod mills • Crushers • High Pressure Grinding Rolls (HPGR) For detailed ...
WhatsApp: +86 18838072829The specification for the apparatus to determining a "Bond" rod mill work index is first described in Bond Maxson (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 inside diameter of 12 inches
WhatsApp: +86 18838072829A Nonstandard rod mill result can be converted to a Bond rod mill work index by: Bond Wi RM = × (Wi nonstandard)^ Source: Dec 2021 Public Grindability Database Bond rod mill Wi versus A×b for copper porphyries A slightly better relationship can be determined if the database is limited to projects of a similar lithology. Limiting to ...
WhatsApp: +86 18838072829The Bond rod mill work index is a commonly used metric to describe ore grindability in the middle size classes, generally from 12 mm down to 1 mm. There are a couple of rod mill designs out there ...
WhatsApp: +86 18838072829Commentary on the apparatus of the Bond rod mill Work Index by Alex Doll December, 2015 The Bond "Third Theory" of comminution was originally divided into three size classes reflecting the varieties of comminution equipment common during the time period when Bond (and his collaborators) were gathering the information to calibrate comminution models.
WhatsApp: +86 18838072829Introduction. A Bond Ball Mill Work Index test is a standard test for determining the ball mill work index of a sample of ore. It was developed by Fred Bond in 1952 and modified in 1961 (JKMRC CO., 2006). This index is widely used in the mineral industry for comparing the resistance of different materials to ball milling, for estimating the ...
WhatsApp: +86 18838072829In the Bond ball mill test, the work index is finally obtained. by. w. P Gbp PF. i = ... [Show full abstract] different characteristics of rod mill and ball mill, solving the grinding problem of ...
WhatsApp: +86 18838072829Bond Rod Index Mill, 12" x 24" consisting of a one (1) piece cast shell complete with integral wave, 1 Hp 3/60/220 volt motor/gear reducer drive, support frame which allows the mill to tilt +/ 5 degrees during operation and 45 degrees for discharge (manual operation), receiving pan, rod charge and control panel complete with digital revolution counter, start/stop buttons and emergency ...
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 18838072829It was confirmed that the introduced method is a rapid and accurate method to determine the Bond rodmill work index. The Bond rod mill work indices obtained by this method were compared to those of standard Bond work indices. The comparison of both methods based on paired ttest showed that differences of mean values for the Bond work index ...
WhatsApp: +86 18838072829Based on the standard procedure defined by Bond, the ball mill work index is determined by simulating a closed cycle dry grinding in a laboratory Bond ball mill until a stable circulating load of 250% is established (Bond, 1949, Bond, 1952, Bond, 1961). The ball mill work index is determined by Eq. (10). The recommendation is the ball mill ...
WhatsApp: +86 18838072829FIGURE 5: BOND ROD MILL WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS (MPa) 5 10 15 20 25 30 35 WiRM (metric) The lack of fit observed relating the crushing Work Index was expected to carry over to the other Bond Work Indices. Figure 5 displays the plot of rod mill Work Index (Wi RM) versus UCS. These
WhatsApp: +86 18838072829Bond Test WI's (kWh/t): Rod Mill: Ball Mill: kWh/ 9 kWh/t . Bond Standard Circuit Work Index: Assume the rod mill Work Index of applies from the actual rod mill feed sizeof 19,300 mµ (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod µ
WhatsApp: +86 18838072829Calculate a Mill's Operating Work Index. Use 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.
WhatsApp: +86 18838072829For comparing the standard Bond rodmill work index and the new modeled method, work index (W i) and produced fine particles in a cycle (G i) for the four samples determined. The performed paired Student's ttest results indicated that the Standard Deviation for G i and W i obtained by the shortened method are respectively and in ...
WhatsApp: +86 18838072829GSL can carry out Bond Rod Mill Work Index tests to determine the energy requirements for milling ore in a rod mill. The test requires a minimum of 20kg of material. Closing screen sizes typically range from to 212µm. Abrasion Index Test. The Abrasion Index is a recognised procedure to quantify abrasiveness and approximate wear ...
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 18838072829A Bond rod mill work index test (BRMWI) is a standard test for determining the rod mill work index of an ore sample [21]. The BRMWI is a measure of the resistance of the material to crushing and grinding in a rod mill and is used to calculate the grinding power needed for a given material parcel regarding rod mill grinding conditions. Along ...
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 18838072829Cleaning and Storing of Ball Mill Charge after the Bond Work Index Procedure is done: Add about 500 g of silica sand into the mill containing the ball charge. Seal the mill. Rotate for 20 revolutions to clean. Empty the mill charge and sand into the ball try once grinding is complete. Clean out the mill using a brush. Put the lid on the mill.
WhatsApp: +86 18838072829In the paper proposed by García et al. [5], a deep study on the Bond ballmill and Bond rodmill standard tests is shown with different ores. The most impacting result of this work is the ...
WhatsApp: +86 18838072829See this useful summary Table of Bond Work Index by Minerals. For any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the Work Index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um. The sample was received crushed appropriately for the ball mill test.
WhatsApp: +86 18838072829This is because work index frequently changes as a function of the product size in comminution. If target grind size during a project is changed, or if the test is run at the wrong product size, then it is necessarily to provide a correction. The goal of this work is to create an equation to adjust a Bond ball mill work index from one P 80 basis
WhatsApp: +86 18838072829The Bond rod mill grindability test is a widely used tool to estimate the response of ores to rod milling. However, the mass of ore required to conduct the test, which can typically vary from about 8 to as much as 20 kg, may represent a challenge when sample availability is present work proposes an alternative procedure, which is based on the sizemass balance model with a ...
WhatsApp: +86 18838072829Bond rod mill standard testStandard conditions for determining the work index of rod mills under laboratory conditions are: mill size = 305 mm (internal diameter) × 610 mm (internal length) with wave type lining ... Bond had used short tons to determine work index. To convert to metric tons the factor has been used here, (62 × ...
WhatsApp: +86 18838072829The Ball mill work index is the final Bond work index, applicable to the size range of ball milling (very roughly: from mm to about 75 µm; yes, it overlaps the Rod Mill Wi range). More on ...
WhatsApp: +86 18838072829You can also review the stepbystep Bond Work Index Test Procedure I posted here. See thisuseful summaryTable of Bond Work Index by Minerals. For any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the Work Index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to ...
WhatsApp: +86 18838072829Bond Abrasion Index (Ai) sufficient mass to produce 4 x 400 g of charges of 19+ ore. Bond rod mill work index (RWi). Typically, 1012 kg at the target crush size. Bond ball mill work index (BWi). Between 610 kg at the target crush size will suffice depending on the number of cycles. Levin open circuit grindability test.
WhatsApp: +86 18838072829The Bond rod mill work index is not as common as the Bond ball mill work index, and there are two different variations on the mill apparatus. The models expect a mill with a "wave liner", and is not compatible with mills using "smooth liners". Most laboratories outside of Australia use the wave liner style of machine these ...
WhatsApp: +86 18838072829Wi Bond Work Index Ws Specific energy correction for size distribution (kWh/t) WiBM Bond Ball Mill Test Work Index (kWh/t) 3. KEYWORDS Autogenous Grinding (AG), Ball mill, Bond Work Index (Wi), Comminution circuit, High Pressure Grinding Rolls (HPGRs), Rod mill, SemiAutogenous Grinding (SAG), Specific energy (W) 4. INTRODUCTION AND BACKGROUND
WhatsApp: +86 18838072829samples and perform the rod mill test on the samples blend. Bond Ball Mill (BBM) Standard Test The procedures to carry out the Bond grindability tests in ball mills and rod mills are outlined in They are usually referred to as the standard tests, but it must be highlighted that the procedures haven't been defined by ...
WhatsApp: +86 18838072829The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and maximum and finally the type of circuit open/closed ...
WhatsApp: +86 18838072829• WiBM The Bond ball mill work index, in metric units. • WiRM The Bond rod mill work index, in metric units. • WiC The Bond impact crushing work index, in metric units. • Density The coarse particle density measured in either the Bond impact crushing work index test or the drop weight test, t/m³.
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