版權(quán)說明:本文檔由用戶提供并上傳,收益歸屬內(nèi)容提供方,若內(nèi)容存在侵權(quán),請進(jìn)行舉報(bào)或認(rèn)領(lǐng)
文檔簡介
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,
溫馨提示
- 1. 本站所有資源如無特殊說明,都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請下載最新的WinRAR軟件解壓。
- 2. 本站的文檔不包含任何第三方提供的附件圖紙等,如果需要附件,請聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
- 3. 本站RAR壓縮包中若帶圖紙,網(wǎng)頁內(nèi)容里面會(huì)有圖紙預(yù)覽,若沒有圖紙預(yù)覽就沒有圖紙。
- 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
- 5. 眾賞文庫僅提供信息存儲(chǔ)空間,僅對用戶上傳內(nèi)容的表現(xiàn)方式做保護(hù)處理,對用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯,并不能對任何下載內(nèi)容負(fù)責(zé)。
- 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容,請與我們聯(lián)系,我們立即糾正。
- 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時(shí)也不承擔(dān)用戶因使用這些下載資源對自己和他人造成任何形式的傷害或損失。
評論
0/150
提交評論