Abstract 1. IN A PROCESS FOR THE PREPARATION OF ACICULAR, MAGNETIC Y-FE2O3 BY REACTION OF PRECURSOR A-FEOOH TO FE3O4 FOLLOWED BY OXIDATION TO SAID Y-FE2O3, WHEREIN SAID PRECURSOR A-FEOOH IS PREPARD BY OXIDIZING FERROUS ION IN AN ACIDIC CRYSTAL GROWTH LIQUID SOLUTION, IN THE PRESENCE OF SEED CRYSTALS OF A-FEOOH ADDED THERETO, WHILE ADDING ALKALI TO SAID ACIDIC CRYSTALS GROWTH SOLUTION TO PRECIPITATE SAID PRECURSOR A-FEOOH, SAID SEED CRYSTALS BEING PREPARED BY OXIDATION OF FERROUS ION IN A SEED PREPARATION LIQUID SOLUTION CONTAINING ALKALI, THE IMPROVEMENT, WHEREIN (A) SAID SEED CRYSTALS ARE PREPARED AT A TEMPERATURE LOWER THAN 50*C., (B) SAID SEED PREPARATION SOLUTION CONTAINS AN AMOUNT OF ALKALI AT LEAST 15% IN EXCESS OF A STOICHIOMETRIC AMOUNT REQUIRED FOR OXIDATIVE CONVERSION OF SAID FERROUS ION TO FERRIC ION AND (C) ACID IS ADDED TO SAID SEED PREPARATION SOLUTION AFTER FULL OXIDATIVE PREPARATION OF SAID SEED CRYSTALS, BUT BEFORE ADDITION OF SAID SEED CRYSTALS TO SAID CRYSTAL GROWTH SOLUTION, TO LOWER THE PH OF SAID SEED PREPARATION SOLUTION TO 2-5.
IN A PROCESS FOR THE PREPARATION OF ACICULAR, MAGNETIC Y-FE2O3 BY REACTION OF PRECURSOR A-FEOOH TO FE3O4 FOLLOWED BY OXIDATION TO SAID Y-FE2O3, WHEREIN SAID PRECURSOR A-FEOOH IS PREPARD BY OXIDIZING FERROUS ION IN AN ACIDIC CRYSTAL GROWTH LIQUID SOLUTION, IN THE PRESENCE OF SEED CRYSTALS OF A-FEOOH ADDED THERETO, WHILE ADDING ALKALI TO SAID ACIDIC CRYSTALS GROWTH SOLUTION TO PRECIPITATE SAID PRECURSOR A-FEOOH, SAID SEED CRYSTALS BEING PREPARED BY OXIDATION OF FERROUS ION IN A SEED PREPARATION LIQUID SOLUTION CONTAINING ALKALI, THE IMPROVEMENT, WHEREIN (A) SAID SEED CRYSTALS ARE PREPARED AT A TEMPERATURE LOWER THAN 50*C., (B) SAID SEED PREPARATION SOLUTION CONTAINS AN AMOUNT OF ALKALI AT LEAST 15% IN EXCESS OF A STOICHIOMETRIC AMOUNT REQUIRED FOR OXIDATIVE CONVERSION OF SAID FERROUS ION TO FERRIC ION AND (C) ACID IS ADDED TO SAID SEED PREPARATION SOLUTION AFTER FULL OXIDATIVE PREPARATION OF SAID SEED CRYSTALS, BUT BEFORE ADDITION OF SAID SEED CRYSTALS TO SAID CRYSTAL GROWTH SOLUTION, TO LOWER THE PH OF SAID SEED PREPARATION SOLUTION TO 2-5.
Claim 2
Dependent Claim
168 words
IN A PROCESS FOR THE PREPARATION OF ACICULAR, MAGNETIC Y-FE2O3 BY REACTION OF PRECURSOR A-FEOOH TO FE3O4 FOLLOWED BY OXIDATION TO SAID Y-FE2O3, WHEREIN SAID PRECURSOR A-FEOOH IS PREPARD BY OXIDIZING FERROUS ION IN AN ACIDIC CRYSTAL GROWTH LIQUID SOLUTION, IN THE PRESENCE OF SEED CRYSTALS OF A-FEOOH ADDED THERETO, WHILE ADDING ALKALI TO SAID ACIDIC CRYSTALS GROWTH SOLUTION TO PRECIPITATE SAID PRECURSOR A-FEOOH, SAID SEED CRYSTALS BEING PREPARED BY OXIDATION OF FERROUS ION IN A SEED PREPARATION LIQUID SOLUTION CONTAINING ALKALI, THE IMPROVEMENT, WHEREIN (A) SAID SEED CRYSTALS ARE PREPARED AT A TEMPERATURE LOWER THAN 50*C., (B) SAID SEED PREPARATION SOLUTION CONTAINS AN AMOUNT OF ALKALI AT LEAST 15% IN EXCESS OF A STOICHIOMETRIC AMOUNT REQUIRED FOR OXIDATIVE CONVERSION OF SAID FERROUS ION TO FERRIC ION AND (C) ACID IS ADDED TO SAID SEED PREPARATION SOLUTION AFTER FULL OXIDATIVE PREPARATION OF SAID SEED CRYSTALS, BUT BEFORE ADDITION OF SAID SEED CRYSTALS TO SAID CRYSTAL GROWTH SOLUTION, TO LOWER THE PH OF SAID SEED PREPARATION SOLUTION TO 2-5.