Process and plant for producing metal oxide from metal salts

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.