Functional performance analysis of ball milling has been described previously by Mclvor “Coarse” versus “fine” or product particle cutoff size is first selected usually equal to some benchmark passing size of the circuit product eg 80 The function of the grinding circuit is to generate new product size material or “fines” from “coarse” particles in the circuit feed ... As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.
Generally speaking there are three simple and direct means to increase ball mill output The first one is to allocate an impact crusher before the grinding mill As a result the mineral stone will be first crushed through the crusher As the mineral particles become smaller in size it is easy to reduce the grinding system load
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Improve The Crushing Rate Of Ball Mill Considering from the grinding media another method to achieve energy saving and consumption reducing is to accurate the diameter of steel balls and make the steel balls with proper proportion and make the grinding media has proper shape
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The mill is equipped with a discharge diaphragm at the end This diaphragm retains the grinding media in the second chamber and allows the discharge of finely ground material Closed Circuit Ball Mill System Clinker Gypsum and other desired additives are fed to the ball mill in specific proportions based on the quality requirement
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mill absorbed power and ball filling degree As indicated on the graph a small variation in power could be the result of a significant variation of balls filling degree As the ball wear rate depends directly on the surface of the media charge a small variation in power will lead to an important increase of wear rate The risk of underloading or
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Beside lower ball charge will increase P80 of ball mill because of less number of impacts but mean residence time will increase by lower ball charge because of more volume to occupy I think at last in this situation power consumption will increase
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Feed to mill is getting coarser See “Ball Mill Feed” Cut down classifier water Check feed and feed water Coarser Feed to mill is getting finer See “BallMill Feed” Add more water to classifier Check feed and feed water 7 Circulating Load Rising If circulating load too high it
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The following are factors that have been investigated and applied in conventional ball milling in order to maximize grinding efficiency a Mill Geometry and Speed – Bond 1954 observed grinding efficiency to be a function of ball mill diameter and established empirical relationships for recommended media size and mill speed that take this factor into account As well mills with different
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3 CASE STUDY A 15 mio ta cement plant is having a closed circuit ball mill for cement grinding The mill has been operating with satisfactory performance interms of system availability and output however power consumption
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Ball Mill Power Calculation Example 1 A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80 passing ¼ inch 6350 microns The required product size distribution is to be 80 passing 100 mesh 149 microns
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