method, the slurry is conducted through an elongate generally upright mixing zone in a treatment vessel and is mixed therein to promote dissolution of the crystals and formation of sodium sulfate solids. The slurry is then conducted to a clarifying zone.
Sesquisulfate crystals descending from the mixing zone are collected in the reservoir of a collector located beneath the mixing zone. Gas is bubbled through the crystals in the reservoir to promote dissolution thereof and to provide a flow of gas bubbles ascending through the mixing zone to promote a turbulent flow regime therein and consequent mixing of the slurry. Sodium sulfate solids descending from the slurry in the clarifying zone are collected and conducted out of the vessel along with entrained liquid consisting principally of sulfuric acid andwon
two Emmy Awards for Outstanding Writing for Children, and among the
many programs he has written for and produced is the hit PBS Kids
television show Between the Lions. He has also produced animated
videos of picture books, among them many by Dr. Seuss and P. D. Eastman.
He and his wife-the novelist C. A. Belmond-divide their time between
the woods of Redding, CT. (where the squirrel-watching is great), and
France. Squirrels on Skis is his first book.

PASCAL LEMAITRE is the illustrator of numerous books for young people, and his editorial work appears regularly in The New Yorker, The New York Times, The New York Times Book Review, Time, and Print.
He spends half the year in Brussels, where he teaches at Le Cambre, and
half the year in Brooklyn, New York. To find out more