ball mills and sag mill problem
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- ball mills and sag mill problem
the mill is used primarily to lift the load (medium and charge). Additional power is required to keep the mill rotating. 8.1.3 Power drawn by ball, semi-autogenous and autogenous mills A simplified picture of the mill load is shown in Figure 8.3 Ad this can be used to establish the essential features of a model for mill power.
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SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21 . 6 7 The largest SAG mill is 42′ (12.8m) in diameter powered by a 28 MW (38 000 HP) motor. 8 A SAG mill with a 44′ (13.4m) diameter and a power of 35 MW (47 000 HP) has ...
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Depending on the mill size the SAG mills draws between 2 MW and 17 MW. The product from the SAG mill is further reduced in size using pebble crushers and ball mills. Hence, typical gold or copper ore requires between 2.0 and 7.5 kWh per ton of energy to reduce the particle size.
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Ball Mill - an overview ScienceDirect Topics. The ball mill accepts the SAG or AG mill product. Ball mills give a controlled final grind and produce flotation feed of a uniform size. Ball mills tumble iron or steel balls with the ore. The balls are initially 5–10 cm diameter but …
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Rom Ball Mills A Comparison With Agsag, Rom ball mills a comparison with agsag milling critical size buildup problems rom ball mills like sag mills utilise the table 3 a summary of rom ball and sag mill test conditions Ball Mills And Sag Mill Problem Amp From Canada
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Principle of SAG Mill operation. SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%.[6][7] The largest SAG mill is 42′ (12.8m) in diameter, powered by a 28 MW (38,000 HP ...
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The design of such grinding mills is extremely critical, requiring sophisticated software tools, proprietary calculation worksheets, and experienced technical engineers and drafters. This blog will review how the mill design process has changed over the …
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the ball mill, but they can also be used as a one-stage grinder. The absence of, or reduction in the number of, balls means they can be less costly to operate than ball mills. SAG mills of over 40-foot diameter have been constructed. Like the ball mill, the AG/SAG mill will have a critical rotation speed above which grinding ceases. Mill motor ...
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mills with the rod mill and ball mill laboratory work indices. Note, in Figure. 1, that the rod mill product slope is less than 0.5 due to an extra amount of nes present being fi fi ner than 650 μm. These fi nes proceed to the ball mill improving the ball mill effi ciency. Also, the plotted rod mill P80 value, as shown in Figure 1, is 2900 ...
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Ball Mills And Sag Mill Problem Amp. Ball Mills and Sag Mill problem AMP Maintenance Forums. Hello all, I work in an industrial copper company as vibration analysis supervisor. This company started to work about 2 years ago. We have two Ball Mills and one Sag. Free consultation 40 years of industry experience providing one-stop solution
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Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size …
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SAG Mill vs Ball Mill. ... As the diameter and length of mills increased several critical problem areas were identified. One of the most important was the severe …
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The fraction of mill volume occupied by rocks, grinding media and slurry in grinding mills are dominant factors influencing AG and SAG mill power draw and grinding rate.
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Ball Mills And Sag Mill Problem. AGSAG mill is inefficient in grinding particles of a certain size, typically in the range of 25-55 mm, i.e., pebbles. Therefore, cone crushers are often used as pebble crushers and integrated into AGSAG mill circuits to break the critical size particles that accumulate in the mill and to increase the performance ...
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Problems And Solutions On Ball Mill In Mineral Processing. problems and solutions on ball mill in mineral processing GRINDING PROCESS IN SAG AND BALL MILLS I Atutxa and I to grind and crush ore is a new field being explored by main industrial players No problem our control Ball mill The solution BrainWave ball mill BrainWave is a proven control system Read More The
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Ball Mills and Sag Mill problem AMP . 21/11/2007· This company started to work about 2 years ago We have two Ball Mills and one Sag Mill We had some visual inspection on pinion and ring gears, during these inspections we found some abnormal wear on this gears (pictures show this problem in enclosure) After that we decided to do some tests as vibration and oil analysis
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Hello everyone, After the SAG mill there is a SAG box, where the output of the SAG is transferred into. There are 4 pumps (2 operational and 2 in stand-by) that transfers the material to a cyclones battery and then to two ball mills. When the material is fed into the SAG box, its distribution i
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Grinding in ball mills is an important technological process applied to reduce the. size of particles which may have different nature and a wide diversity of physical, mechanical and chemical ...
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Mill drive arrangement. Mill drives are generally located on the outside of the mill to facilitate maintenance. • Mill discharge arrangement. If the SAG and ball mills feed separate pump systems this is not an issue. If the two stages feed the same pump system, …
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ONLINE SAG MILL PULSE MEASUREMENT AND. 2/6/ Depending on the mill size the SAG mills draws between 2 MW and 17 MW The product from the SAG mill is further reduced in size using pebble crushers and ball mills Hence, typical gold or copper ore requires between 20 …
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What should we do to solve those problems? 1 First of all, it is necessary to do analyses including changes of nature of the ore, whether the amount of ore, water, sand and overflow size are normal. Then do the measures to deal with them. 2 Reduce the amount of feed to the mill until the working state of the ball mill returns to normal.; 3 Appropriately reduce the amount of volume of rinse …
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The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. …
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Attrition mill is a type of grinding mill by kinds of media to crush lump to powder-like substances. The impact can be rock on rock such as in an Autogenous Grinding (AG) mill, rock and a small ball charge (~10%), used in Semi Autogenous Grinding (SAG) mills, balls of various sizes in Ball Mills and less commonly these days, steel rods in Rod Mills.
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As the mills tumble and turn the grinding media wears away until the mill charge is too low to maintain the grind. The solution to this problem is to add more …
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2.1 SAG mill modeling In MODSIM, one of the simulation models used for a SAG mill unit is SAGT (Semi-Autogenous Grinding with Trommel) model. In this model, a SAG mill with a trommel screen at mill discharge is modeled using the full population balance including particle attrition and …
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We have two Ball Mills and one Sag Mill. We had some visual inspection on pinion and ring gears, during these inspections we found some abnormal wear on this gears (pictures show this problem in enclosure). After that we decided to do some tests as vibration and oil analysis. Result of the vibration and oil analysis tests are as a below:
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ball mills and sag mill problem romania. Ball Mill Grindability – Bond Work Index Abrasion Index Crushing Grinding and Concentration Pilot Plant SAG AG Mills can be sized according to any of the most appropriate methods of rock hardness testing like SPI JK Barrett and Starkey This discussion will be limited to testing for selection of rod and ball mills
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Your problem can occur in a SAG Mill or Ball Mill. Other point to consider is the particle size distribution, it is possible to receive a finer ore from the mine and the particle size distribution of the product from the crushing circuit is different, In this case, the residence time in …
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ball mills and sag mill problem. Developments in SAG Mill Design and Operation Over the last few years, SAG mill manufacturing technology has advanced rapidly. The bounds of mill size have been pushed from two directions. Firstly, the advent of ring motors has removed the constraint applied by …
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ore per day in six overflow ball mills. The concentrate is transported to a smelter a few miles away. The crushed ore from primary and secondary ores is conveyed into bins. The ore from the bins is fed into the ball mill using a conveyor belt. The ball mill grinding circuit is illustrated in Figure 2. % Solids 78.9 Circulating Load 474% Advance ...
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The ball mills are operated at a ball charge volume of 30–32% and 78.5% critical speed. The SAG mill trommel undersize is combined with the ball mills' discharge and pumped to two parallel packs (clusters) of twelve 660 mm diameter cyclones. The cyclone underflow from each line reports to a ball mill, while the cyclone overflow is directed ...
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Ball Mill Sole Plate. This crown should be between .002″ and . 003″, per foot of length of sole plate. For example, if the sole plate is about 8′ long, the crown should be between .016″ and .024″. Ball Mill Sole Plate. After all shimming is completed, the sole …
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Semi-autogenous plus ball mill has been the "work horse" of mills. SAG vs Ball Mill Advantages . AG & SAG Mill Grinding Compared – Which is Best. Grinding rods and balls can be obtained in uniform sizes, weights and of a specified quality. Their …
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1. SAG mill is the primary tool for grinding. SAG mill is used before the other mills. Ball mill is a secondary, and it is used after the SAG mill. 2. SAG mill breaks the raw material into pieces for the further grinding. Ball mill is used to grind the pieces of raw …
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AG Mill and SAG Mill. Feeding size: ≤25mm. Capacity: 0.65-615t/h. Output size: 0.074-0.89mm. Applications: It is commonly used in the mineral processing industry and ferrous and non-ferrous metal ore and nonmetal ore processing plants. It can also be used in …
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