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 GROUP CONSISTING OF THE WATER-SOLUBLE SALTS, THE OXIDES, HYDROXIDES, CARBONATES AND BASIC CARBONATES OF THE CLASS OF METALS CONSISTING OF BE, CD, AL, 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, THEN INTRODUCING INTO THE SLURRY A MEMBER OF THE ALKALINE GROUP CONSISTING OF AMMONIUM HYDROXIDE, AMMONIUM CARBONATE AND AMMONIUM BASIC CARBONATE TO A 7-12 PH, FILTERING AND THEN WASHING THE RESIDUE UNTIL PRACTICALLY FREE OF SOLUBLE SALTS.