Capacity: max production capacity for aluminum sulphate is 25 TPD
Year of Installation: 2009
Process: This is a batch process, meaning the plant does not have to be operated 24/7.
Current Status: Still in Operation
This is a continuous process for the manufacture of aluminum sulfate by the reaction of sulfuric acid with alumina-containing solid in an aqueous suspension. The reaction is performed by bringing together, in a reaction zone, water, sulfuric acid and an alumina-containing solid. While these can be independently added to the reaction zone, it is preferred to employ a mixing sequence which permits facile control and the most efficient thermal balance of the process. Preferably, the alumina-containing solid is suspended in water to form a slurry which is introduced into a mixing zone where it is contacted with sulfuric acid. The alumina-containing solid and sulfuric acid are admixed in substantially stoichiometric proportions, e.g., from 80-120 percent of the theoretical amounts for the reaction. The amount of water used is sufficient to provide a sulfuric acid concentration in the reaction zone from 30 to about 60 weight percent. The sulfuric acid is of sufficient concentration to achieve a desirable exothermic heat of solution for preheating the reactants and is introduced into the interior of the stream of the alumina slurry using a coaxial introduction nozzle. The blended streams are then passed through a mixing zone where they are intimately admixed by helical flow with multiple and repeated changes in the direction of rotation of the helical flow. The reactants are preheated to the incipient reaction temperature, at least about 150° F., by the exothermic heat of solution of the sulfuric acid and/or alumina suspension reactant streams and any supplemental heating that may be necessary. The reaction mixture, at the incipient reaction temperature, is then passed into a continuous flow reaction zone which is maintained at a temperature from 225° to 260° F. by cooling with indirect heat exchange. The pressure of the reaction zone is maintained at sufficient super atmospheric pressure of the reactants to permit achieving the aforesaid temperature. The reactants are passed through the reaction zone at a rate sufficient to provide a residence time therein from 5 to about 45 minutes, sufficient to achieve from 78 to about 100 percent completion in the reaction. The crude reaction product is withdrawn from the reaction zone, diluted, cooled and subjected to density separation to recover unreacted alumina and more dense, inert solids. The unreacted alumina can be recycled. The separated reaction product is diluted to prepare an aqueous solution of aluminum sulfate of the desired concentration.
GET IN TOUCH
Call us at (609) 586-8004 or CONTACT US