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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 21.67 the largest sag mill is 42′ 12.8m in diameter, powered by a 28 mw 38,000 hp Ball mill. ball mill is also known as ball grinding mill. ball mill is the key equipment for recrushing after the crushing of the materials. it is widely used in cement,silicate products, new building materials, refractory materials, fertilizers, various ores and glass ceramics, etc. dryer machineBall mills have been the primary piece of machinery in traditional hard rock grinding circuits for 100 years. they are proven workhorses, with discharge mesh sizes from 40m to 200m. use of a ball mill is the best choice when long term, stationary milling is justified by an operation. sold individually or as part of our turn-key ore Aug 06, 2012 ball mill is primarily used for fine grinding.it is key equipment which repulverises the material after it is crushed. kefid company has been amongst the pioneers for many years in the design and application of milling systems for the size reduction The jaw crusher has been a staple of the hardrock mining industry since its invention. it is used as a primary crusher for all types of ores. the jaw typically takes the larger run of mine product and produces a sized discharge for feed to a secondary crusher such as a cone crusher, ball mill, or hammer mill. we have sold our jaw crushers to Sbm is a iron ore machine manufacturer in china and supplies rock crushers and grinding mills for iron ore beneficiation plant the most commonly used crushers and grinding mills in iron ore crushing and grinding process for iron ore mining are jaw crusher cone crusher hammer crusher and ball mill scm supermicro mill etc. more details.Feb 20, 2017 the grinding charge in a ball mill consist of cast or forged steel balls. these balls are fed together with the feed and consequently ball mills can be in operation for months without stopping. the ball size is often in the diameter range of 20-75 mm. the biggest size is chosen when the mill is used as a primary grinding mill.