英文.wps

1、Influence of some rock strength properties on jaw crusherperformance in granite quarryAbstract：The influence of rock strength properties on Jaw Crusher performance was carried out to determine the effect of rock strengt

2、h on crushing time and grain size distribution of the rocks．Investigation was conducted on four different rock samples namely marble．dolomite．1imestone and granite which were representatively selected from fragmented l

3、umps in quarries．Unconfined compressive strength and Point load tests were carried out on each rock sample as well as crushing time and size analysis．The results of the strength parameters of each sample were correlated

4、 with the crushing time and the grain size distribution of the rock types。 The results of the strength tests show that granite has the highest mean value of 101.67 MPa for Unconfined Compressive Strength(UCS)test．6.43

5、MPa for Point Load test while dolomite has the least mean value of 30.56 MPa for UCS test and 0.95MPa for Point Load test。 According to the International Society for Rock Mechanic OSRM)standard．the granite rock sample ma

6、ybe classified as having very high strength and dolomite rock sample，low strength．Also，the granite rock has the highest crushing time(2 1．O s)and dolomite rock has the least value(5．0 s)．Based on the results of the inves

7、tigation，it was found out that there is a great influence of strength properties on crushing time of rock types．1 IntroductionThe strength of a material refers to the materials ability to resist an applied force．Strength

8、 property of rock is the ability of the rock material to resist failure when load is applied without yielding or fracture．The mechanical properties of rock depend upon the interaction between the crystals，particles and

9、cementation materialof which it is composed．The yield strength of a material is an adequate indicator of the material’s mechanical strength and is the parameter that predicts plastic deformation in the material．from whic

10、h one can make informed decisions on how toincrease the strength of a material depending on its micro-structural properties and thestudy of quarry fines looked at possible relationship between quarry plant operation and

11、the generation of quarry fines．The conclusion drawn have been critically revealed that hard rock aggregate plant production is directly proportional to the number of crushing stages；it increases with an increase in produ

12、ction stage．Low reduction fines generation at each stage especially where the rock or mineral are fragile，however，the cumulative fines production may be higher than a process using fewer stages with higher reduction．The

13、panicle size analysis is the method used to determine the particle size distribution or the grain size distribution of rock／ore materials．In practice，close size control of feed to mineral processing equipment is required

14、 in order to reduce the size effect and make the relative motion of the particles separation dependent．The particle size distribution of a matedal is important in understanding its physical and chemical propenies．It affe

15、cts the strength and load bearing properties of rocks．Theeasiest conventional method of determining mineral particle size is sieve analysis，where grain size is separated on sieve of different sizes／apertures using Sieve

16、Shaker．Thus the particle size distribution is defined in tems of discrete size ranges and measured in micron．It is usually determined over a list of size ranges thatcovers nearly all the sizes present in the sample． Some

17、 methods of determination allow much narrower size ranges to be defined that can be obtained by use of sieves and are applicable to panicle sizes outside the range available in sieves．However，the idea of notional‘sieve’t

18、hat‘retains’particles above a certain size and‘passes’panicles below that size is universally used in presenting panicle size distribution data of all kinds．The size distribution may be expressed as a‘range’analysis，in w

19、hich the amount in each size range is listed in order of finenessof particles．It may also be presented in‘cumulative form’in which the total of all sizes‘retained’or‘passed’by a single notional‘sieve’is given for a range