外文翻譯.wps

1、河南理工大學(xué)萬方科技學(xué)院本科畢業(yè)論文 河南理工大學(xué)萬方科技學(xué)院本科畢業(yè)論文Influence of some rock strength properties on jaw crusherperformance in granite quarryAbstract Abstract：The influence of rock strength properties on Jaw Crusherperformance was carried

2、 out to determine the effect of rock strengthon 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

3、 representatively selected from fragmented lumps 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 streng

4、th parameters of each sample werecorrelated 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 Unconf

5、ined Compressive Strength(UCS)test．6.43 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

6、OSRM)standard．the granite rock sample maybe 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 rockhas the least value(5

7、．0 s)．Based on the results of the investigation，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 abil

8、ity to resist an applied force．Strength 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 河南理工大學(xué)萬方科技學(xué)院本

9、科畢業(yè)論文 河南理工大學(xué)萬方科技學(xué)院本科畢業(yè)論文general categories and conversion factors were determined for each category．This allows for intact rock strength data to be made available through point load testing for numerical geotechnical ana

10、lysis and empirical rock mass classification systems such as the Coal Mine Roof Rating(CMRR)．Crushing is an integral portion for mineral processing operations and is critical for the preparation of ore for downstream pro

11、cess formineral processing operations．Crushing of quarried rock is carried out in stages，with the primary crushing stage typically carried out using jaw crusher and subsequent(secondary and tertiary)．From field observati

12、on，the greater the number of crushing stage，the higher theamount of fine produced as a proportion of total plant throughout．The type of crusher used also directly controls the amount of fines produced． A recent study of

13、quarry fines looked at possible relationship between quarry plant operation and the generation of quarry fines．The conclusion drawn have been criticallyrevealed that hard rock aggregate plant production is directly propo

14、rtional to the number of crushing stages；it increases with an increase in production stage．Low reduction fines generation at each stage especially where the rock or mineral are fragile，however，the cumulative fines produc

15、tion may be higher than a process using fewer stages with higher reduction．The panicle size analysis is the method used to determine the particle size distribution or the grain size distribution of rock／ore materials．In

16、practice，close size control of feed to mineral processing equipment is required in order to reduce the size effect and make the relative motion of the particles separation dependent．The particle size distribution of a ma

17、tedal is important in understanding its physical and chemical propenies．It affects the strength and load bearing properties of rocks．The easiest conventional method of determining mineral particle size is sieve analysis，