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Lignosulfonate 1
- Thread starter saldanha
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it may give you an idea of its chemical structure.![[smile]](/data/assets/smilies/smile.gif "[smile] [smile]")
it may give you an idea of its chemical structure.
Sodium Lignosulphonate is used as a viscosity modifier in chalk slurries. By reducing the viscosity it enables a higher solids content and hence less energy use at the driers in cement production.
I'd wait for confirmation before taking this as gospels since this is a left over bit of information from some years ago.
JMW
I'd wait for confirmation before taking this as gospels since this is a left over bit of information from some years ago.
JMW
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1
- #6
Lignosulfonates are surface active products. There is no exact formula for them. But roughly there is benzene rings in polymeric structure where to is bounded different kind of functional groups (HSO3-, H3CO-, -O-, -OH). There is many kinds of lingnosulfonates which differents from each other by molecular weith, amount of hydrocarbons, pH, amount of sulfonate-groups.
They are used mainly as binders and dispersing agents. Most important use is in oil industries where they use it as dispersing agent in oil drilling. It is also used as plasticer and water reducing agent in makeing congrete. There is quit many uses for it.
Try link :
They are used mainly as binders and dispersing agents. Most important use is in oil industries where they use it as dispersing agent in oil drilling. It is also used as plasticer and water reducing agent in makeing congrete. There is quit many uses for it.
Try link :
Lattar,
thanks for the link. I was relieved to see my memory hadn't been faulty!
JMW
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thanks for the link. I was relieved to see my memory hadn't been faulty!
JMW
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
- Thread starter
- #8
Thanks all of you for your contributions.
In our process we fluidize iron ore with a CO/H2 reach gas as reducing agent. This is to produce directly reduced iron (DRI) 92% metalised for steel production. The gas also contains CO2, CH4 and N2.
Lignosulfonate as recently been adopted as a mean of dust control at the iron ore stockyard.
Coincidentally exactly at the time this product was adopted we are now having clustering of our product. Clustering is making our operation very difficult.
Can this product cause this clustering effect?
Just for interest: the shaft is at about 800 deg. C
Localized overheating can cause clustering. Clustering can also be caused by some form of oxidation however the atmosphere is highly reducing in the shaft.
In our process we fluidize iron ore with a CO/H2 reach gas as reducing agent. This is to produce directly reduced iron (DRI) 92% metalised for steel production. The gas also contains CO2, CH4 and N2.
Lignosulfonate as recently been adopted as a mean of dust control at the iron ore stockyard.
Coincidentally exactly at the time this product was adopted we are now having clustering of our product. Clustering is making our operation very difficult.
Can this product cause this clustering effect?
Just for interest: the shaft is at about 800 deg. C
Localized overheating can cause clustering. Clustering can also be caused by some form of oxidation however the atmosphere is highly reducing in the shaft.
Can i suggest you also direct this technical query at the suppliers and the web-site Lattar provided in case you don't find an answer here?
JMW
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
JMW
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
JKEngineer
Chemical
Ligonsulfonates are the solubilized breakdown products resulting from the kraft pulping process. The lignin in the wood is digested by the cooking liquor ("white liquor") which contains sodium sulfide, sodium hydroxide, and other good things. The result, after the cook is that the very large lignin molecules are broken down into smaller, sulfonated pieces that can be dissolved and removed from the fibrous cellulose in the wood. The resulting black liquor is washed out of the pulp, concentrated and then burned to recover energy from the organics and to regenerate the cooking chemicals.
There is no single molecular formula for lignosulfonates. Any good kraft pulping text, or possibly TAPPI in the US, CPPA, SAPPI, etc. elsewhere, should be a source of specific information on the chemistry and structures.
Jack M. Kleinfeld, P.E. Kleinfeld Technical Services, Inc.
Infrared Thermography, Finite Element Analysis, Process Engineering
There is no single molecular formula for lignosulfonates. Any good kraft pulping text, or possibly TAPPI in the US, CPPA, SAPPI, etc. elsewhere, should be a source of specific information on the chemistry and structures.
Jack M. Kleinfeld, P.E. Kleinfeld Technical Services, Inc.
Infrared Thermography, Finite Element Analysis, Process Engineering
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