Ball mill and rod mill are suitable for different materials 1 selection by materials hardness ball mill has a strong adaptation of material and it is suitable for grinding hard materials such as slag iron ore copper ore etc rod mill is suitable for grinding brittle material such as rare metals 2 selection by required particle

Ball mill work index adjustment the bond ball mill work index test requires the operator to select an appropriate screen size to close the test the procedure states that the closing screen size should be such that the product size of the test is the same as the expected product size of the operating

Ball mills thyssenkrupp industrial solutions the grinding plant consists of an sag mill of 104 m diameter x 518 m length with a kw dual combiflex drive and a ball mill

Bonds work index ball mills insmart systems the bonds ballmill work index is a measure of the resistance of the material to grinding in a ball mill this index is widely used in the industry for comparing the resistance of different materials to ball milling for estimating the energy required for grinding and for ball mill scaleup

Feb 01 the specific grinding energy of a 244 m interior diameter wet overflow ball mill is usually calculated using the bond work index and bond’s third law equation 3 w 10 w i p f where f 80 is the 80 passing size of the feed μm p 80 is the 80 passing size of the product μm w is the specific grinding energy kw ht

For the circuit design a bo nd ball mill work index of 181kwh t was used with design contingency to increase to a maximum of 191kwht design comminution data is summarised in table

It is commonly known that one must run the bond ball mill work index test such you pick a closing mesh to give a p80 close to desired grind size this is because work index frequently changes as a function of the product size in comminution if target grind size during a project is changed or

Jan 01 for the advanced media competency test rocks from the rowland and kjos competency test ranging between –75 mm and 19 mm are subjected to a bond impact crushing work index determination a rod or ball mill work index test is also carried out and the data used to determine the autogenous or semiautogenous mill required

Mar 15 the crushingball milling circuit specific energy was estimated on the basis of the bond equation and the relevant bond work indices with the crushing energy given from the sagag f80 to a nominal product with p80 of 80 mm being added to the ball mill energy from f80 of 80 mm to the actual p80 of the pilot test given either by the sagag

May 01 finegrinding characteristics of hard materials by attrition mill powder technology 103 3 doi sx junya kano hiroshi mio fumio saito correlation of size reduction rate of inorganic materials with impact energy of balls in planetary ball

Mill ball mill closed circuit crushing to 16 mm open circuit 8’ dia rod mill to 1 mm closed circuit 8’ dia ball mill to p80 um the ore test work index circuit operating work index 9 the standard bond circuit coarse ore bins fine ore bins screen crushing screen classification rod mill ball mill this is the reference basis for all work

Mill type overview three types of mill design are common the overflow discharge mill is best suited for fine grinding to 75 – 106 microns the diaphram or grate discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150 – 250 microns the centerperiphery discharge mill has feed reporting from both ends and the product discharges

The different faces of quarry bond work index of limestone face4a results less than 20kwht remaining 6 samples are marked as hard rock because of high energy consumption and low grindability rate index terms — ball mill bond work index comminution grindability liberation limestone ultra

The grinding jar for the bond index rod mill is 12″ x 24″ in size and has a waveshaped design at least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill the rod mill work index rwi is used for particle size determination in a size range from 25 mm down to 21 mm whereas ball mill work

The use of high pressure grinding rolls is gaining significant interest as a replacement for sag milling in the comminution of hard rock ores because of the potential for reduced costs in terms of energy and grinding ball cycle test akin to the bond ball mill work index determination the first cycle starts similar to the bond work

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