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Technical Cement Forum / high free lime

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bazarah 20/09/2009 19:26:03

high free lime

Hey Friends;

How do you know the kiln feed is hard to burn? If free lime high in clinker

it may be caused operation process not quality? Our kiln by pass system

Target kiln feed:

LSF: (96 -98.5) %

SM: (1.95 – 2.15)

AM: (1.2 -1.4 )

Residue: 90 ^u : (6 -8 ) %

200 ^u : (0.5 – 1.0 ) %

Clinker:

C3S : (52.0 – 55.0) only!

free lime:(1.90 – 2.30) high

liter weight :1120- 1230

If you have any experience or idea to improve this problem,

we are highly appreciated to receive your sharing.

Thanks in advance

Best regards

Bazarah

Raj Sahu 21/09/2009 03:57:54

Complete mineralogical and microstructural evaluation study of limestone needed to know the root cause of hard burning nature of limestone.Use of suitable mineralizer will improve reaction kinetics and may reduce free lime content.

electron1539 21/09/2009 11:24:12

the modulii LSF in accepted limit also AM

SM is below the recommended limit that mean that the material will be easy to burn

the sieve 200 is look good : less than 2.2 %

u have to investigate 3 more things ;

1- quartz XRD rietveld of residue 63µ

2- quartz XRD rietveld of residue 40µ

3- burnability test for a sample of kiln feed

and what about the type of fuel ? is it coal ?

bazarah 21/09/2009 13:33:24

Dear sir

I am very much thank full to you for quick response

These problems happen after kiln stoppage then running but we can not increase

feed more to avoid high free lime, our feed materials are same area crushed.

Normal operation: kiln feed ( 215- 227)t/h with free lime ( 1.60 – 1.80)

Now : kiln feed ( 200- 204)t/h with free lime ( 1.90 – 2.20)

the type of fuel is crude oil if you have procedure for burn ability test can you

send to me my email :abazarah@hotmail.com

Regards,

Bazarah

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