Causticizing Process in Direct Causticizing Technology

Fundamental and bench scale experiment of our association has been finished. Pilot plant test is now under running and data have been accumulated and analyzed.The results of fundamental and bench scale test are summerized as follows.(1) It was confirmed that the development target which is shown below could be accomplished.Reaction Temperature 70-80°CReaction Time 0.5-1 hrCausticization over 90%white liquor concentration 250g/l (as Na2O)(2) Causticization and behavior of non process elements were investigated and data for scaleup were accumulated by carrying out the recycled test of ferric oxide.(3) Size distribution of the particle before and after hydrolysis of Na2Fe204 was measured. It was found out that the particle didn't get finer.(4) Washing effeciency of recovered ferric oxide after hydrolysis was checked.