Process for the separation of iron and titanium values by extraction and the subsequent preparation of anhydrous titanium dopxode

Claim 1

A PROCESS FOR THE PREPARATION OF ANHYDROUS TITANIUM DIOXIDE WHICH COMPRISES: (1) DISSLOVING IN HYDROCHLORIC ACID AT A TEMPERATURE OF FROM ABOUT 40 TO ABOUT 80*C. A TITANIFEROUS MATERIAL, SAID HYDROCHLORIC ACID INITIALLY RANGING FROM ABOUT 6 TO ABOUT 12 MOLAR AND THE MOLE RATIO OF SAID ACID TO THE ACID SOLUBLE METAL VALUES IN SAID ORE RANGING FROM ABOUT 1 TO 4 ON AN EQUIVALENT BASIS, (2) CONTACTING THE ACID LEACHATE WITH AT LEAST A STOICHIOMETRIC MOLAR EQUIVALENT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF TRIALKYL PHOSPHATES AND ALKYL AMINES, MONOALKYL PHOSPHATES AND DIALKYL PHOSPHATES, THE ALKYL GROUPS OF SAID TRIALKYL PHOSPHATES CONTAINING FROM ABOUT 4 UP TO ABOUT 8 CARBON ATOMS, THE ALKYL GROUPS OF SAID ALKYL AMINES CONTAINING FROM ABOUT 6 UP TO ABOUT 12 CARBON ATOMS AND THE ALKYL GROUPS OF SAID MONO- AND DIALKYL PHOSPHATES CONTAINING FROM ABOUT 4 TO ABOUT 18 CARBON ATOMS, SAID TRIALKYL PHOSPHATES AND ALKYL AMINES PREFERENTIALLY EXTRACTING DISSOLVED IRON VALUES FROM SAID ACID LEACHATE AND SAID MONO- AND DIALKYL PHOSPHATES PREFERENTIALLY EXTRACTING DISSOLVED TITANIUM SPECIES FROM SAID ACID LEACHATE, (3) SEPARATING THE ACID AQUEOUS AND ORGANIC PHASES (4) RECOVERING THE TITANIUM VALUES AS THE HYDRATED OXIDE, AND (5) CALCINING SAID HYDRATED OXIDE THEREBY CONVERTING IT INTO A SUBSTANTIALLY IRON FREE, ANHYDROUS TITANIUM DIOXIDE.