Design Retention time is usually obtained from laboratory testwork and proper use of LabtoPlant flotation scaleup factors. An Example of flotation cell capacity and circuit retention time approximation: Estimate the volume of conditioners and flotation cells required to handle 9100 dry tons of ore per 24 hours at 30% pulp solids by weight ...
WhatsApp: +86 18838072829In this work, the RTD measurements were carried out for a primary ball mill in closed circuit with hydrocyclones at two feed rates (, 280 and 230 tons per hour (t/h)) by means of tracer technique. Also, perfect mixer, NMixer, and Weller models were studied to describe the RTD curves.
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WhatsApp: +86 18838072829The formula for critical speed is CS = 1/2π √ (g/ (Rr) where g is the gravitational constant, R is the inside diameter of the mill and r is the diameter of one piece of media. This reduced to CS = /√ (Rr). Dry mills typically operate in the range of 50%70% of CS and most often between 60%65% of CS.
WhatsApp: +86 18838072829torque mill test is the mill energy input divided by the solids load. The energy specific cumulative grinding rate at each screen size is calculated from a torquemill test as in the example that follows. Torque mill solids load during test: kg ( lb) of ball mill feed sample from plant survey. Sample is reconstituted with water to be
WhatsApp: +86 18838072829From the ratio of total weight of balls in the mill to the daily addition weight of balls, the ratio of the grate openings size of the mill to the original ball size, and the rotation rate of...
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WhatsApp: +86 18838072829To calculate hydraulic retention time (HRT), use the formula: HRT = Volume / Q, where: HRT Hydraulic retention time [h]; Volume Volume of the tank or reactor [m³]; and. Q Influent volumetric flow rate [m³/h]. Let's say, for example, that you'd like to find the HRT of an aeration tank with a capacity of 3000 m3, and the plant's ...
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WhatsApp: +86 18838072829The formula for calculating critical mill of speed: N c = / √ (D d) Where: N c = Critical Speed of Mill. D = Mill Diameter. d = Diameter of Balls. Let's solve an example; Find the critical speed of mill when the mill diameter is 12 and the diameter of balls is 6. This implies that;
WhatsApp: +86 18838072829The bottom parameters used in ball milling design (power calculations), rod mill or any tumbling mill ... Ball Roller Power Calculation Model #1. A wet grinding ball mill in closed circuit is to be detective 100 TPH of a substance with a work index of 15 and a size distributor of 80% passing ¼ inch (6350 microns). ...
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WhatsApp: +86 18838072829If a ball mill contained only coarse particles, then 100% of the mill grinding volume and power draw would be applied to the grinding of coarse particles. In reality, the mill always contains fines: these fines are present in the ball mill feed and are produced as the particles pass through the mill.
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WhatsApp: +86 18838072829The flowrate Q could be measured from the production P [tons/h] and the circulating load C and given by Q [tons/h] = C P [tons/h] . The circulating load could be obtained by measuring the particle size distribution of the feed, the product and the reject, and by then using the Koulen method. (see this post)
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WhatsApp: +86 18838072829You now have the unit capacity. Then take the volumetric feed rate of the new ore per time. Divide the unit capacity by the feed rate and you have the nominal retention time. Say your unit capacity is 1/2 cubic meter and you are feeding 6 cubic meters per hour, your retention time would be about 5 minutes.
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WhatsApp: +86 188380728291. Closed Circuit = W 2. Open Circuit, Product Topsize not limited = W 3. Open Circuit, Product Topsize limited = W to W Open circuit grinding to a given surface area requires no more power than closed circuit grinding to the same surface area provided there is no objection to the natural topsize.
WhatsApp: +86 18838072829Here is a formula that allows you to calculate the circulating load ratio around a ball mill and hydrocylone as part of a grinding circuit. For example your ball mill is in closed circuit with a set of cyclones. The grinding mill receives crushed ore feed.
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