Grinding & Classification Circuits

Grinding & Classification Circuits2018-06-17T09:51:34-04:00
  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Grinding.
  • OR Select a Topic that Interests you.
  • Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
    Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.
  • Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.

Table of Bond Work Index (2 replies and 1 comment)

isqui
1 year ago
isqui 1 year ago

Hello, I was checking the Table of Ball Mill Index. Regarding the source 1 (Bond), I checked the source and the values are different. I thought the reason was that the values reported by Bond were in short ton instead of metric ton. However, I tried to calculate one value and I still get different results. For instance basalt for Bond is 20.41 kWh/short ton, which multiplied by 1.1 short ton/metric ton gives a higher value (22.45) than the one reported on the website (18.9). Where am I wrong? Thank you!

Alex Doll
1 year ago
Alex Doll 1 year ago

Hi Isqui

I've got a copy of the 1953 work index tabulation by Bond (available from here: http://www.OneMine.org/document/abstract.cfm?do
cid=33579 )

The Andesite is given as 18.25 kWh/st; 18.25 × 1.1023 = 20.12

The 911 tabulation says Andesite is 20.1 kWh/t, which is correct.

Cement clinker in Bond's list is 13.56 kWh/st; 13.56 × 1.1023 = 14.947 

The 911 tabulation says 15.0 kWh/t; also correct.

So it looks like the Source 1 column of the 911 tabulation is correct.

isqui
1 year ago

Hello Alex,

Thank you very much for your reply. We might have a different version of Bond's work then. I checked the values on "Crushing and Grinding Calculations - Part II" from 1961 on Table IIIA. I don't have access to the link you sent. From the paper, the value for Andesite is 22.13.

Best regards

RayMartin
1 year ago
RayMartin 1 year ago

The number from Fred C in 1961 was an average of 10 determinations and the Table has the rider that values can vary for the same material from different sources.  Therefore it is only a guidline.

The later values from Metso's "Basics in Mineral Processing 2015" (Bond worked for All-Chalmers, which is now Metso) gives the value for basalt as 17.10. All kwh/st.

For a particular application or project to size a mill circuit it would be prudent to have the Work Index (also for abrasion or crushing) determined at a mineral processing laboratory.

I work in the Iron Ore industry and Wi can vary widely between ore types and even within the same pit.   

Please join and login to participate and leave a comment.

BUY Laboratory & Small Plant Process Equipment

We have all the laboratory and plant equipment you need to test or build/operate your plant.

ENTER our Mining Equipment' Store

We Sell EQUIPMENT for all types of Mineral Treatment PROCESSES and Laboratory Testing needs

Do you need METALLURGICAL TESTING of your ORE?

View the Services we Provide

911Metallurgist Mineral Processing & Process Development Laboratory

We have a metallurgical test for every possible mineral type and treatment.

Need ENGINEERING Services or Plant TROUBLESHOOTING?

We can IMPROVE ALL PLANTS / Mineral Processing Engineering & LABORATORY Ore Testing

911Metallurgy Engineering

Contact us for process engineering, metallurgical investigations, plant optimization, plant troubleshooting, needs. WE “FIX” METALLURGY.

I Need Consulting Engineering Help
I Need Ore Laboratory Testing