16 posts
re limestone and viscosity
Sodium tripolyphosphate can work immediately (minutes), but is more expensive than soda. My experience is that soda works more slowly and has full effect after 2-3 days. If the slurry is stored for some time, you can use both dispersing agents - STPP for immediate effect, soda for long term.
Know the answer to this question? Join the community and register for a free guest account to post a reply.
84 posts
re limestone and viscosity
In Soviet Union time, more popular method lowering of viscosity was introduce in pulp surface-active material sach as technical lignosulfonates - 0.1-0.15%.
Best method measuring viscosity is method of API Specification 10A by a konsistometr in Berdens unit http://www.oglasi.ru/images/4a65a60c0b2df2292f480ef14.jpg
537 posts
re limestone and viscosity
Hello Belite,
I have not experienced any reaction time problems with soda ash as a limestone slurry thinner. In both laboratory tests and in the plant, it reacted within minutes. It would have been useless to us if it took days to fully react since we prepared and pumped 3000m3 batches of thinned slurry every 15-20 hours for more than 10 years. The soda ash solution was pumped directly into the mill feed chute and the slurry was already thinned by the time it exited the mill.
Of course the reaction time would depend on slurry temperature, moisture content, dosage rate and type of clay. One or more of these factors may have played a part in your situation, causing a delayed reaction.
Regards,
Ted.