Process of treating metatitanic acid

Claim 1

IN A PROCESS OF REMOVING THE SO4 IMPURITY FROM METATITANIC ACID PRODUCED BY HYDROLYSIS OF AN AQUEOUS SULFURIC ACID SOLUTION OF TITANIUM SULFATE, INTRODUCING INTO A SLURRY OF SAID METATITANIC ACID A MEMBER OF THE ALKALINE GROUP CONSISTING OF THE ALKALI METAL HYDROXIDES, CARBONATES AND BASIC CARBONATES TO A 7-12 PH, THEN INTRODUCING INTO THE SLURRY AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF THE WATER-SOLUBLE SALTS, THE OXIDES, HYDROXIDES, CARBONATES AND BASIC CARBONATES OF BE, CD, AL, MG, ZN, LA, ZR, CE, TH, CB, SB AND TA IN AMOUNT EQUAL TO 0.1 TO 6 PER CENT CALCULATED AS METAL OXIDE BASED ON THE TIO2 CONTENT OF THE METATITANIC ACID, SAID MEMBER OF THE ALKALINE GROUP BEING IN SUFFICIENT AMOUNT TO NEUTRALIZE ALL OF THE SO4 CONTENT OF THE METATITANIC ACID AND TO REACT WITH ANY SALT IN THE SLURRY RESULTING FROM THE INTRODUCTION OF THE MEMBER OF THE GROUP CONSISTING OF THE WATER-SOLUBLE SALTS, THE OXIDES, HYDROXIDES, CARBONATES AND BASIC CARBONATES OF SAID CLASS OF METALS CONSISTING OF BE, CD, AL, MG, ZN, LA, ZR, CE, TH, CB, SB AND TA, FILTERING AND THEN WASHING THE RESIDUE UNTIL SUBSTANTIALLY FREE OF SOLUBLE SALTS.