Ore sample. The ore samples were taken from medium–low grade calcium magnesium phosphate ore in Guizhou's phosphate rock area and crushed to − 1 mm. Fluorapatite, dolomite and quartz pure ...Web
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Crushing Work Index. Material. 17. Iron Ore. 14. Copper Ores. 3. Glass. Crushing Work Index. Material. 14. Quartz. 13. Limestone. 16. Gold Ores. The kilowatt-hours per tone (kWh/t) will work out your work index. The number of kittowatts consumed in a hour divided by the tonnes of rock gives you your work index.Web
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For example, the effect of ore crushing on the shovels of the Gol-e-Gohar iron ore mine was presented with a mathematical model to determine their production levels. This model was obtained using data …Web
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"crushability or grindability", also cal led work index and the "wear profile", ... Crushing of ore and minerals. There are three stages in crushing as stage 1, 2 and 3.Web
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Abstract and Figures. Sinter plants process a mixture of iron ore fines, recycled ironmaking products, slag-forming agents and solid fuel (coke) with the finality of obtaining a product with the ...Web
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6.Evaluation Index of Crushing Process Crushing Processing Capacity. It is expressed in terms of the amount of ore processed per unit time, t/h, to evaluate the crushing process quantitatively ...Web
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Because of the difficulty in determination of this index, alternatives to the standard method have been developed by many researchers (Vedat and Huseyin, 2003). In the determination of ball mill work index 15 kg of representative ore at + 3.35 mm is crushed to − 3.35 mm (Amtech, 2006).Web
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Traditional measurements of ore grindability are the Bond Work Index (Wi) values (Bond, 1952), divided into a low energy crushing work index (WiC) for coarse rocks (75-50 …Web
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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 …Web
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Copper ore samples from Canada are designated Copper ore 1, and copper ore samples from the South American meta-sedimentary copper mine are denoted as Copper ore 2 to Copper ore 6.Copper ore 1 samples represent the same sample with different values of parameters F 80, P 80 and P 100.The samples are shown in the table …Web
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Most of the high-grade hematite iron ores are typically subjected to simple dry processes of crushing and classification to meet the size specifications required for direct shipping ore (DSO). This involves multistages of crushing and screening to obtain lump (−31.5 + 6.3 mm) and fines (approximately −6.3 mm) products.Web
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Abrasion Index. Bauxite ore typically falls into the lower UCS ranges and therefore lends itself to various types of crushing technologies. Of all the variables listed, the two main variables that drive the crusher selection are the feed rate and the percentage of moisture in the feed. ... Another major step in the crushing circuit, for bauxite ...Web
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Moreover, the proportion of pretreated ore crushing products in the proportion of −5000 μm + 74 μm particle size also increased by 6.54 wt%. The average particle size of the pretreated ore crushing products was 4552 μm, which was 17.98% smaller than that of untreated ore. Download : Download high-res image (564KB)Web
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The Bond ball mill grindability test is one of the most common metrics used in the mining industry for ore hardness measurements. The test is an important part of the Bond work index methodology ...Web
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The bond work index of ore indicates how much energy is required to grind the ore and it is a very significant property from a plant point of view. ... The crushing energy for applications in the ...Web
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The results show that the UG2 ore's response to HPGR crushing conforms to the response that has been observed in other ores, e.g., zinc ore, iron ore, copper ore, and gold ore [17,19,45,46]. The data presented in Figure 7 also show that the distribution of cracks between silicate and chromite phases was dependent on the crushing method …Web
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Hard ore Work Index 16 = 100,000/65,000 = 1.54 kwh/t. For the purposes of this example, we will hypothesize that the the crushing index of the hard ore with the increased energy input of 1.54 kw/t reduces the ball mill feed size to 6,500 micrometers. As a result, the mill output will increase with this reduced size to approximately 77,000 tons ...Web
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The BWi is the main parameter for measuring the resistance to the grinding of ore minerals. It represents the energy required for processing (e.g., …Web
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Ore crushing and . sizing at the ... Table 2.2 Average work index for some selected materials (Gupta and Yan, 2006) Material . Work index (W i in kWh/t) Abrasion index (Ai) Limestone . 11.7 .Web
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Ore washing consists of two operations: fragmentation and separation. The crushing operation is mainly to use the washing and soaking effects of water to swell and break the clay, and sometimes it ...Web
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Ore work index Ore bulk density Ore abrasion index (abrasivity) The rock's compressive strength The ore clay content The ore's fragmentability. Soft and low …Web
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Work index indicates the difficulty of ore crushing or ore grinding in mineral processing operation. The initial definition is the work W i consumed by crushing the …Web
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Work Index values (crushing, rod mill and ball mill). Data from 11 mines located around the world is analysed for correlations between UCS and various Wi values. Introduction Need to accurately predict future mine and mill production rates requires a knowledge of ore grindability well in advance of when ore are actually mined.Web
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2.1 Energy. Rock drilling, blasting, and comminution (crushing and grinding) consume a vast amount of energy in hard rock mines. As mentioned in Sect. 1, statistics from hard rock mines indicates that drilling and blasting consumes 2% and comminution does 53% of the total energy input in the whole production chain from mining to mineral …Web
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That study considered an Allis Chalmers Superior 60–109 crusher with a diameter of 2.77 m and productivity from 3434 to 4801 t/h for crushing ore with a uniaxial compressive strength (USC) of 128 MPa. This is similar to the UCS of the structural canga (UCS of 100 MPa) and jaspillites (UCS of 100 to 400 MPa) from the truckless mine in this …Web
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standard Bond crushing, and rod mill work indices, abrasion indices and by Dawson for Bond Ball Mill Work Index tests using crushed feed, and Standard …Web
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We have an existing plant and I want to calculate the CWi based on Bond formulation and compare it with lab tests results. At the existing plant the data are: F80= 370mm. P80= …Web
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The clay content of ore body and high crushing index of ore were the main problems. The blinding problem of the screens due to clay content of ore body was used to reduce effective area of the screens. Hence, it used to cause to the increase circulating load to the crushers as the time proceeds starting from the first run. Thus,Web
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The test determines the Bond Impact Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements when sizing …Web
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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.Web
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The SPI (SAG Power Index) is another related inde x used to determine the ore comminution behavior in AG/SAG mills. The index is obtained from a ba tch test in a mill of 305 mm × 102 mm operatedWeb
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