Patent ID: 8460624

Claim:
A process for producing metal oxide from a metal salt comprising: supplying a first part of the metal salt to a hydrate drier to indirectly heat the first part of the metal salt in the hydrate drier using a heat transfer medium from a first stage of a multi-stage indirect cooler to dry the first part of the metal salt and to control a waste gas temperature of the process by decreasing the waste gas temperature to 110° C. to 170° C.; guiding a second part of the metal salt as a partial stream past the hydrate drier; preheating the first and second parts of the metal salt in a first preheating stage; precalcining the preheated metal salt in a second preheating stage; supplying the precalcined metal salt and a fluidizing gas having a temperature of 150° C. or less to a fluidized bed reactor to calcine the metal salt to form a metal oxide product; cooling the metal oxide product in at least one suspension heat exchanger; and then cooling the metal oxide product in the multi-stage indirect cooler.