abstract |
CALCIUM CARBONATE IN NEEDLE CRYSTAL FORM IS MADE BY DISSOLVING LIME IN AQUEOUS SUCROSE SOLUTION AND TREATING THE SOLUTION WITH CARBON DIOXIDE, THE SUCROSE BEING FREE FROM CRYSTAL POISONS. IF THE SUCROSE IS TO BE RE-USED IT MUST BE TREATED E.G. BY ANION EXCHANGE RESIN TO REMOVE CRYSTAL POISONS. |