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ball mills for gold mining in uk

Ball Mill

Ball Mill

Ball mill is the vital equipment for recrushing after being crushed.

Processing ability:0.5-500t/h

Feeding size:≤25mm

Applied material:cement, silicate, new-type building material, refractory material, fertilizer, ore dressing of ferrous metal and non-ferrous metal, glass ceramics, etc.

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brazil's weg installs sag and ball mill slip ring motors

Global mining drives major WEG via its Russian Commercial Operation WRU has completed a major project for customer PJSC Polyus Gold at its Natalka mine in the Magadan Region. The scope of supply included a pair of slip ring motors of 9,000 kW at 1,000 rpm and another two motors of 7,500 kW also at 1,000 rpm and fully designed to be interchangeable with the old existing motors providing a smooth drop-in replacement. The motors are being applied in pairs to SAG and ball mills that operate through dual pinion drives supplying power to each mill

Historically, WEG says the customer was facing problems for a number of different reasons such as mechanical fits, overheating of antifriction bearings and electrical overload events. “The WEG team evaluated different options in order to offer the most reliable product. A robust design of slip ring rotor motors was recommended including reliable features such as fixed or liftable brushes, internal or external slip ring chamber and different series of sleeve bearings or antifriction bearing in oil bath. The final design was approved after customer inspection at WEG headquarters facilities in Brazil and a technical visit to a cooper mine in Chile where similar WEG motors are successfully operating. A key factor for this project was the local WEG specialists in the market providing fast response to the customer and listening carefully to the customer needs.”

The WEG Slip Ring Mining motors were designed in such a way to allow another technical key factor for this project where  they can operate both as a slip ring motor or as an induction motor fed by inverter when the temperature is very cold (-50°C) and the ore inside the mills gets frozen and then the mills speed can be automatically controlled. The electric motors were delivered in July 2020. Due to sanitary restrictions, the commissioning was postponed to December and work was carried out from November 15 to December 23, 2020.  The target for Natalka is 1,200 t of ore per hour and the average in 2019 was 1,400 t per hour – in the fourth quarter 2020, hourly productivity was usually exceeding 1,500 t

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grinding media - 911metallurgist

Current ball milling theory suggests that grinding capacity is influenced by the size of balls charged to the mill. In selecting the appropriate ball charge, the first objective is to determine that ball size which will grind the coarse particles most efficiently. This size should be the largest ball size charged to the mill. The second objective is to provide the correct ball size distribution to grind the finer particles in the composite ball mill feed. This objective may necessitate charging a second, smaller ball size with the maximum ball size. The practice of charging a pre-determined ratio of two or more ball sizes to a mill is called rationed ball charging

Maximum ball size is determined by several factors, including composite feed size, Bond Work Index, mill speed, mill diameter, and circulating load. An empirical equation was published by Azzaroni in 1981 to describe the relationship between these variables. The Azzaroni equation indicates that the correct ball size for the 2.93 m mill is 81 mm. Years of experience show that a 76 mm ball grinds the coarse particles most effectively

Ball size distribution is governed by the wear law of the mill and by the wear characteristics through the cross-section of the balls charged to the mill. With this in mind, it is interesting to make a qualitative comparison of the ball size distributions which should be generated by 76 mm pearlitic carbon steel balls versus 76 mm martensitic alloy steel balls in the 2.93 m mills

The 76 mm pearlitic carbon steel balls used have a relatively flat hardness gradient from surface to center. Therefore, the inherent wear characteristic of these balls should be nearly constant during their life in a mill

grinding media - 911metallurgist

Martensitic alloy steel balls are much harder, than pearlitic carbon steel balls throughout their cross-section. However, 76 mm martensitic balls generally have a hardness gradient. This gradient reflects varying amounts of soft transformation products such as bainite and pearlite in the ball micro-structure. The wear rates of these products are higher than that of martensite at equivalent carbon content. As a result, the inherent wear rate of martensitic balls increases slightly at the ball becomes smaller. Therefore, for a given ball mill with a constant wear law, the resultant seasoned 76 mm martensitic ball chart should contain more large balls, fewer small : balls, and less surface area than a seasoned charge of 76 mm pearlitic carbon steel balls. The reduced number of small balls, combined with a lower ball charge surface area, might explain the 6% lower grinding efficiency of a 76 mm martensitic ball charge compared to a 76 mm pearlitic ball charge

We analyzed the ball size distributions resulting from charging 76 mm pearlitic carbon steel balls versus charging 76 mm martensitic alloy steel balls. This analysis was made using a computer simulation program that Lorenzetti et al described in 1977 to assess ball size distributions. Results for the 2.93 mills indicated that the martensitic steel ball charge should reduce consumption by at least 30%. However, the surface area of the charge should decrease 5% compared to the pearlitic , steel ball charge because of the hardness gradient effect described above

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