# report 1 - EXM 301 MINERAL PROCESSING LAB REPORT 1 A REPORT...

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EXM 301 MINERAL PROCESSING LAB REPORT 1 A REPORT ON THE DETIRMINATION OF THE BOND WORK INDEX KYLIE NETTLETON 30262427 CONTENTS 1.00AIM 2.00INTRODUCTION 3.00PROCEDURE 4.00RESULTS 5.00DISCUSSION 6.00CONCLUSION 7.00REFERENCES 8.00APPENDIX A – Bond Work Index Grindability Test Record Sheet APPENDIX B – Raw Data

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1.00AIM The aim of this experiment is to determine the Bond Work Index of a quartz sample, using the laboratory ball mill. 2.00INTRODUCTION The Bond Work Index was developed by Fred C. Bond and was first published in 1961. The index relates to “the energy required in kwh/t to reduce a given material from theoretically infinite feed size to 80% passing 100 microns” 1 . The work index of a material can be determined by conducting the standard Bond grindability test in a laboratory. The test is a closed cycle, dry grinding and screening process that is repeated until a steady state is reached. It has been used extensively in the milling industry as a method of predicting and evaluating the performance of crushing and grinding equipment 2 . The equation for the Bond Work Index is as follows: = . ( . )( ) . ( ) . [ Wi 44 5 1 102 x 0 23 G 0 82 10P - ] 10F x = grind size G = the grindability of the ore P = 80% passing size of product F = 80% passing size of feed 3.00PROCEDURE The procedure stated below is an abstract from Murdoch University’s EXM301 Mineral processing I Laboratory Manual, 2009, pp 7. 1. The steel ball charge must conform to the following requirements. Ball Diameter (mm) No. of Balls 38.10 43 31.75 67 25.40 10 19.05 71 15.87 94 Total 285 Mass of Balls = 20.125 kg 2. An 8-10kg sample of minus 3.35mm quartz material will be provided. Sub sample this material into 16 lots and set a sample of about 100g aside for a particle size analysis. Place samples under drying lights to ensure they are dry. 1 2 Mular & Jergensen 1982
3. Using one lot of feed sample, determine the maximum mass that can occupy a volume of 700ml. Vibrate the sample to ensure maximum packing density. Determine the bulk density of the feed (g/mL). The mass of the feed is equal to the initial charge mass to be ground, so keep this material for step 5. The charge mass divided by 3.5 is equal to the Ideal Product, for a 250% circulating load mass. 4. The appropriate grind size in this experiment is 180 microns. Conduct a particle size analysis of the feed to accurately determine the 80% passing size F, and the proportion of minus 180 microns in the feed. (Select sieves from 3.35mm size down to 180 µm). 5. Place the 700mL volume of sample into the mill, together with the ball charge and secure the mill lid. ** Safety** Wear dust mask and keep dust extractor system running. Check with demonstrator before operating. 6. Operate the mill at 70 rpm, without water and grind the sample for 100 revolutions. Stop the

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report 1 - EXM 301 MINERAL PROCESSING LAB REPORT 1 A REPORT...

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