2 posts
TimePosted 25/02/2014 18:05:48

### Loss (gain) on ignition slag

Hello to everybody,

Can you give me the procedure to determinate the loss (gain) on ignition for a blast furnace slags?

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536 posts
TimePosted 26/02/2014 03:27:48

### re Loss (gain) on ignition slag

Hello Edith,

The basic procedure for loss (or gain) on ignition is as follows;-

(a) Ignite a clean platinum crucible in a muffle furnace set at 1000oC for 20 minutes.

(b)  Remove the crucible from the furnace and place in a dessicator to cool.

(c) Once cooled, weight the crucible on an analytical balance to the nearest 0.0001g. (W1)

(d) Weigh out ~1g of sample into the crucible and record the weight of crucible and sample to the nearest 0.0001g. (W2)

(e) Place the crucible and sample into the furnace at 1000oC and ignite for 1hr.

(f)  Remove the crucible from the furnace and place in a dessicator to cool.

(g) Once cooled, weight the crucible on an analytical balance to the nearest 0.0001g. (W3)

(h) Calculate the loss (or gain) on ignition using the following formula;-

LOI =  (W2 - W3) / (W2 - W1) * 100

(Note: A negative result indicates a gain on ignition, GOI)

If you wish to differentiate between LOI and GOI you will have to perform the ignition in an oxygen-free atmosphere (eg nitrogen or argon). Some furnaces are available which are specifically configured for this option; eg

http://www.alibaba.com/product-detail/KJ-1800A-nitrogen-argon-atmosphere-muffle_825166167.html?s=p

Hope this helps...

Regards,

Ted.