Process for the production of titanium dioxide pigments
AssigneeBayer Akteingesellschaft
InventorsGunter Lailach, Karl-Heinz Schultz
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Abstract
Energy required for the calcining or drying operations in the production of titanium dioxide by the sulfate process and the chloride process is at least in part provided by burning by-product offgases containing carbon monoxide obtained in the chlorination of titanium-containing raw materials under reducing conditions.
Claims10
In an improved process for the production of titanium dioxide pigments wherein titanium-containing raw materials are chlorinated under reducing conditions to produce titanium tetrachloride and by-product offgases, the titanium tetrachloride is oxidised to titanium dioxide, washed calcined and/or dried,
- the improvement comprises burning the by-product offgases to provide at least a part of the heat energy required in the calcining or drying steps.
In an improved process for the production of titanium dioxide pigments wherein titanium-containing raw materials are digested with sulfuric acid and titanium dioxide is precipitated from solution by hydrolysis and calcined,
- the improvement comprises burnin9 by-product offgases from a chlorination of titanium-containing raw materials under reducing conditions to provide at least a part of the heat energy required in said calcining step.
Dependencies are inferred from the claim text.