In the present invention a method, apparatus and computer program are presented, with which the amount of balls among ore material contained in a grinding mill is estimated as a percentage by volume of the total volume of the mill. Preferably, the invention relates to semiautogenous mills. In the invention, an expanded Kalman filter is used to estimate the ball charge such that measurements ...
2. Background. The SAG grinding process has been modeled by various authors, either generating explanatory models of the grinding process, with the aim of modeling, simulating, and optimizing the individual process, as well as integrating it into aggregate processes, such as the minetomill (M2M) paradigm, a practice that has generated the capacity to analytically assess aspects of mining and ...
In the formula, A represents the area ... Due to the large volume of the SAG mill, in order to facilitate the simulation and calculation, the SAG mill is simplified to a ring column model of ... As shown in Figure 9, the power of the best fracture case 6 is about 70 kW, and the power of the complete SAG mill is about 700 kW, which verifies the ...
This is because the product size distribution from AG/SAG mills tends to have more fine material than the HPGR circuit product (Morrell, 2009; 2011) and hence need less ball mill power. Based on ...
Since the days of mandatory high cost pilot plant testing in 6 ft × 2 ft SAG mills autogenous griding/semiautogenous grinding (AG/SAG), mill specifi c energy is now calculated by various empirical formulae and pilot testing carried out in small laboratory mills.
A Cerro Verde expansion used a similar flowsheet as the 2006commissioned circuit to triple circuit capacity. The expansion circuit includes eight MP1250 cone crushers, eight HPGRs (also x units, with 5 MW each), and six ball mills (22 MW each), for installed comminution power of 180 MW. and a nameplate capacity of 240,000 tpd.
A. Casali Add to Mendeley https://// Get rights and content Abstract Comminution, particularly milling, is on average the largest consumer of energy in mining. Actual comminution circuits consist in most of the cases in coarse crushing, SAG milling, pebble crushing and secondary ball milling.
one SAG mill ( dia.(m)* length(m)) following two parallel ball mills (5dia.(m)*7lenght(m)). The aim of this research work was to investigate on the ball filling estimation of Miduk semiautogenous (SAG) Mill via an utilized method. Miduk SAG Mill circuit is shown in Figure 1. Figure 1: Diagram of Miduk Copper Complex
the phantom ball mill is therefore expressed by the following formula: ... Calculations of the power requirement for the "phantom" ball mill ... of a single logical equation for SAG mill power ...
A Metallurgist or more correctly a Mineral Processing Engineer will often need to use these "common" Formulas Equations for Process evaluation and calculations: Circulating load based on pulp density *** Circulating load based on screen analysis *** Flotation Cell Conditioner Capacities *** Two Product Formula *** Three Product (bimetallic) Formula (Part 1) ***needs verify Three ...
Power modelling Especific energy modelling SAG mills operation data 1. Introduction Comminution, especially milling, is the most important operation in mineral processing, both for its relevance to the downstream processes as well as for the high costs associated with the energy consumption.
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As you know, there are three calculation methods. The method selection depends on the crushing/grinding stage (the power size and the necessary finished class). The crushing work index ( CWi) is an indicator characterizing the energy amount (kW * h / t) needed to destroy single pieces of material with a relatively large size range (75 + 50mm ...
bling mills (AG/SAG, rod, and ball mills) involved in reducing the size of the primary crusher product to that of the final product (usually the cyclone overflow of the last stage of grinding prior to flotation/leaching). 2. Feed rate to the circuit (dry tonnes/h) 3. Power draw of the comminution equipment (kW)
Common convention generally refers to highaspect ratio mills as SAG mills (with diameter to effective grinding length ratios of 3:1 to 1:1), lowaspect ratio mills (generally, a mill with a significantly longer length than diameter) are also worth noting.
AG/SAG mills in the data base are up to 40ft in diameter and ball mills are up to 26ft in diameter. The measured gross power draws from these mills are plotted against the model predictions in Figure 1. As indicated by this data base the accuracy of the model (1 standard deviation) is %. How to Use the Model
To calculate the operating work index of a circuit, you must measure four things: P: The power draw of the mill. This is usually calculated from the input leads to the motor, then multiplied by ...
The new measurement technique is demonstrated by surveying the load of a large SAG mill following a crash stop and a subsequent grindout. The SAG mill in this example has an internal diameter of m; a belly length inside liners of m; cone angles of 15 degrees and a trunnion diameter of m.
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is home to a collection of both free and subscriptionbased calculation tools to aid metallurgical process engineers perform comminution calculations. Grinding circuit design tools, including for SAG millball mill circuits, and geometallurgy energy models are available to subscribers. The online library of technical articles ...
3. SAG mill fractional total filling, J t, fractional ball filling, J b, and fractional rock charge filling, Jr, ( J r = J t − J b); 4. SAG mill total feed; 5. Oversize crusher product and primary cyclone underflow; and, 6. SAG mill fresh feed, including the feed sizes ( F 80. . . F 20). Step 1: Oversize Crusher Feed, Primary Cyclone Feed and ...
SAG Ball mill % ball content SAG % ore content SAG grate size and end mill design including grate geometry, location, shape, pan cavity, recycle % in pan cavity, et. al. SAG lifter and end cone geometry can change SAG mill performance more than 20%50% depending on P80 transfer size and Axb, some of which is published and some will be ...
Gross Power Draw and Specific Energy Calculator for Autogenous Grinding (AG), SemiAutogenous Grinding (SAG) and Ball Mills. Exit Mill Calculator. Shell Sizing Parameters. Parameters. Value . Value . Mill Shell Inside Diameter: [m] [ft] Mill Shell Inside Length: [m] [ft] Shell Heads Cone Angle:
The average consumed energy at SAG and ball mills to produce one ton of final product was kWh/t and kWh/t respectively. Thus, the ball mill consumes kWh/t, more energy than the ...
Methods to Estimate AG/SAG Mill Grinding Power Requirements (1) Using the results of SMC data (2) Using SAG Power Index (SPI) data (3) Using the 1989 Barratt method updated on Alex Doll's Web site (February 16, 2015) (3) Using Don Burgess' method (11th Mill Operators Conference 2012)
things. It is incorrect to say, for example, "the ball mill work index is 13 kWh/t and the SAG mill SEC is 5 kWh/t, so the total circuit energy is 18 kWh/t." This example is a real discussion that one of the authors had with a flotation engineer who was confused because of the convention of using the same units for both quantities.
EF5BM=[ P80+ ×P80] ( 3 ) The EF4 formula requires both the rod mill and ball mill work index (rod mill Wi is used to calculate the optimal feed size) and because this is a "singlestage ball mill" calculation, the F80 is actually the rod mill feed size (10,000 µm) from Table 1 and the P80 is the ball mill circuit product. The EF5 factor only applies below 75 µm to ball
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