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it is important to note that the bond ball mill work index on sag ground ore is similar to but not the same as a crushed bond ball mill work index. it is ~ 7% higher because the sag mill grinds the softest components quickly and leaves the harder material to be ground in the ball mill. figure 3 presents the graph of sag pinion energy vs. bwi.

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in the chrome ore pelletisation process chromite ore along with 4–5% coke is milled in the wet ball mill and filtered ore cake is mixed with bentonite and used for production of green pellets. the vertical shaft furnace is used for sintering (drying, preheating, sintering and cooling) of green pellets at the temperature ~ 1300 °c for 6 to 8 h depending on the process variables.

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the bond ball mill work index (bbwi) is the industry standard procedure for assessing the grindability of ores. the test involves conducting a locked cycle grinding test using bond's standard mill design. the locked cycle test enables a batch process to emulate the grinding behaviour of a continuous mill with a 250% recirculating load.

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