Lignosulfonate as granulation aid-particle hardener

摘要: An improved process for more economically and effectively producing crystalline by-product ammonium sulfate (A/S) by granulating A/S feedstock recycle material together with an A/S-sulfuric acid-granulation aid-particle hardener solution ammonia to bind the crystals together. Underlying gist of improvement concept is identification a low-cost readily available lignosulfonate pulp paper industry which, when used in predetermined relatively small proportions, has now been discovered be very satisfactory as granulation such crystals. Use instead alum, currently practiced, reduces manufacturing cost about much one dollar per short ton product.