How do you perform a nbsp Process Retention Time Estimate Evaluation to study nbsp what time needed for a mineral to nbsp travel from nbsp before the mill until to concentrate and tailings and nbsp how to estimated this time. I thought using a nuclear tracer to be measure at the feed and at the tailings. For a conventional operation saying crushing, classification, milling, flotation , including cyclones for de-watering etc, and finally nbsp thickening nbsp , can be assumed a range of 6 to 8 nbsp hrs.
I was nbsp planning to use a nbsp radioactive nbsp material on the feed and detect it on the final products:concentrate and tailings.
Retention time is a much used, but often understood concept. For some processes (grinding, flotation and leaching) it can be a very valuable factor, but in others (crushing, screening, and gravity separation) it means much less. Retention time is also highly dependent on the ore characteristics, and can and will vary over time. In all cases it is dependent on feed characteristics and circuit configuration. If it is expressed it usually is mentioned as the average retention time, acknowledging that some a Particles pop right through and others hang around.
The average time for concentrate will normally be much less than for tails. For processes where the tails are the smaller component it may be the revers. Although I saw one operation, phosphate, where the concentrate was depressed and the tails floated leading to the reverse. And for coal the retention time for the coal is usually greater than for the tails.
For grinding, flotation, and leaching it is determined by laboratory studies as the amount of processing time needed to achieve a certain particle size (grinding) or achieve a certain concentrate grade and recovery (flotation and leaching). It is used to determine the volume of processing equipment needed to achieve those goals. And for these processes is usually in the range of several minute to hours (leaching).
For crushing, screening, and gravity separation, as the processes move at a faster rate (seconds) it has some meaning, but is often overshadowed by sizing constraints based on particle size and shape. nbsp.
Excluding stockpiles and surge bins you and not considering a complicated flotation circuit (i.e rougher scavenger and not rough- cleaner - recleaner with a regrind circuit - scavenger) you are probably looking at 30 to 60 minutes for SAG mill, 45 to 60 minutes for ball mill, and then one to 3 hours for flotation, and one to 3 hours for thickening filtering, for a total of 3 to 6 hours which could get to 8 hours. Of which 1 to 3 hours for the concentrate and 3 to 6+ for the tails (less if you go to ponds or use high rate thickeners with filters).
The retention time during reverse flotation of phosphatic ores are suppose to be very less having calcite or dolomite as the main impurities. The acidic pH in which phosphates are depressed and allowing calcite or dolomite to be floated gives very less retention time for the particles in the Cell.
Retention time = Static volumetric capacity volume flow. nbsp For things like screens, air beds, conveyor belts, etc., volume is based on bed depth.
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Tailings are the materials left over after the process of separating the valuable fraction from the uneconomic fraction of an ore.Tailings are distinct from overburden, which is the waste rock or other material that overlies an ore or mineral body and is displaced during mining without being processed The extraction of minerals from ore can be done two ways: placer mining, which uses water.
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