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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 18838072829The Rod mill work index is one type of a Bond work index, applicable to the size range of rod milling (very roughly, 12 mm to 1 mm). The Lowenergy Impact Crushing work index is another Bond work ...
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 Sections and They are usually referred to as the standard tests, but it
WhatsApp: +86 18838072829bond rod mill work index essa Bond Rod Mill Work Index Equipment amp Apparatus Review . Sep 22 2017 The middle size class represented by rod milling is fitted to a tumbling test referred to as the Bond rod mill work index WiRM or RWi The apparatus used to determine this work index was described in 1943 by Bond amp Maxton The author has noted there are some laboratories that ...
WhatsApp: +86 18838072829The particle size of the product is finer than the other two, and the particle size of the product is 2 ~ It is generally used to grind products and then supply them to ball mills. 4. Different cylinder proportions. Although ball mills and rod mills are both long and cylindrical, their cylindrical ratios are different.
WhatsApp: +86 18838072829The Bond rod mill work index ( Wir) is measured using Bond´s standard rod mill grindability test, which is conducted in lockedcycle mode to emulate the continuous closedcircuit operation. Besides the laborintensive conduct of the test, which typically requires from 5 to 10 cycles for reaching steadystate, it normally requires 820 kg of ...
WhatsApp: +86 18838072829An global operational work index, W iog, is defined for a conventional grinding plant consisting of a rod mill followed by three inverse hydrocycloneball mill grinding circuits and its value is estimated online. This global operational work index is based on an equivalent unitary ball mill circuit. The foundation for W iog is Bond's equation ...
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WhatsApp: +86 18838072829A rod mill operation principle and inside motion. https://
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 18838072829The Bond Index conforming rod charge consists of: 6 rods of " diameter and 21" length; 2 rods of " diameter and 21" length; The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a waveshaped design. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill.
WhatsApp: +86 18838072829FIGURE 8: ROD MILL/BALL MILL WORK INDEX RATIO v. UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS (MPa) 0 1 2 WiRM/WiBM (metric) Siddall et al (1996) identified the ratio of Bond rod mill Work Index and ball mill Work Index as being indicative of an ore's compentency. Figure 8 plots this ratio versus UCS; no trend is apparent ...
WhatsApp: +86 18838072829Large Batch Laboratory Rod Mill / Ball Mill. Sale! Grinding Mill for Metallurgical Pilot Testing of 10 to 150 Kilo/Hr. US 50,000 40,000. Sale! Small Grinding / Regrinding Mill 3 to 10 Kilo/Hr. US 40,000 35,000. Attrition Grinding Mill. Read more; Bond Work Index Test Ball Mill. US 14,500. Bond Rod Work Index Mill. Bond Grindability ...
WhatsApp: +86 18838072829Catalog excerpts. BALL MILLS, ROD MILLS BOND INDEX MILLS Labtech Essa manufacture a range of metallurgical laboratory sized ball and rod mills to suit most applications. Included in the range is a Bond index mill which has specific application in establishing the grindability of ores (see sheet 2 of this data sheet) The ball and the rod mill ...
WhatsApp: +86 18838072829Rod Mills are particularly useful, if you run a low tonnage operation and are looking for coarse product. Our Rod Mills are available in multiple diameters to fit the needs of your operation. Grinding, primarily by attrition, Rod Mills require comparatively low levels of power to operate. Rod Mills can be either wet or dry designs.
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 18838072829Open circuit 8' dia. rod mill to 1 mm Closed circuit 8' dia. ball mill to P80 um The ore Test Work Index = Circuit Operating Work Index 9 The Standard Bond Circuit Coarse Ore ... • Bond Test WI's (kWh/t): Crushing: Rod Mill: Ball Mill: • Bond Standard Circuit Work Index: W Total = + + = kWh/t
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.
WhatsApp: +86 18838072829mills with the rod mill and ball mill laboratory work indices. Note, in Figure. 1, that the rod mill product slope is less than due to an extra amount of nes present being fi fi ner than 650 μm. These fi nes proceed to the ball mill improving the ball mill effi ciency. Also, the plotted rod mill P80 value, as shown in Figure 1, is 2900 ...
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 Sections and They are usually referred to as the standard tests, but it
WhatsApp: +86 18838072829What is the Bond Work Index FormulaEquation? In case you had forgotten, here is a classic: You can read all the details of this now "Biblical" grinding power requirement calculation formula in Fred Bond's original paper. You can also review the stepbystep Bond Work Index Test Procedure I posted here.
WhatsApp: +86 18838072829that the Bond CWi and the standard Bond BM Wi both recorded average values of 8 kWh/t, it was surprising that the Bond Rod Mill Wi average was kWh/t. Since the ore is unusually soft, the Rod Mill Wi is probably irrelevant in determining required power for the SAG mill. Drop Weight Tests
WhatsApp: +86 18838072829dard Circuit, assume m diameter overflow mills, and use 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
WhatsApp: +86 18838072829The SMC Test's® versatility allows it to be used for a range of comminution optimization and modelling applications. The last 20 years has seen an increasing awareness of the need for detailed ore characterization data with which to map orebody hardness, regardless of the nature of the project. In the case of new project development the need ...
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 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 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...
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 18838072829The Bond rod mill work index (Wi RM, or RWi) conducted from a feed size of approximately 10 mm to a product size on the order of 1 mm. The Bond crushing (impact) work index (Wi C, CWi, LEIT or IWi) conducted on specimens of a nominal dimension between 50 mm and 75 mm.
WhatsApp: +86 18838072829The Bond Rod Mill Work Index (BRMWI) test was only possible for Blend 5 (Table 2) due to excessive fines in the other blends. The calculated power required for the remaining blends only considered grinding the coarse fraction in the rod compartment. The Bond formula and power model were used to verify the effects of operational variables, hardness
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