Method for preparing aluminum molybdate with cationic membrane electrolysis method

Abstract

The invention discloses a method for preparing aluminum molybdate with a cationic membrane electrolysis method. An aluminum sheet is taken as an anode, an inert electrode is taken as a cathode, an aqueous solution containing a depolarizer and sodium molybdate is taken as an anolyte, an acid solution, an alkaline solution or a salt solution is taken as a catholyte, and the aqueous solution containing the depolarizer and the sodium molybdate is electrolyzed in a double-chamber electrolytic cell with a cationic membrane serving as a diaphragm with the temperature controlled to range from the room temperature to 90 DEG C in a constant-current electrolysis or constant-voltage electrolysis manner until all Na<+> ions are transferred to a cathode chamber; a product obtained in an anode chamber is washed and filtered with deionized water, an obtained filter cake is dried at the temperature of 300-400 DEG C for 1-4 h, and the aluminum molybdate which is high in purity and free of impurity phases is obtained. According to the method, the effect of cationic membrane electrolysis is used, the Na<+> ions are transferred to the cathode chamber, the effect caused by the Na<+> ions is eliminated, the reaction time is short, and the finally obtained aluminum molybdate product is high in purity and free of the impurity phases.

Description

technical field [0001] The invention relates to a method for preparing aluminum molybdate by cationic membrane electrolysis, which belongs to the field of inorganic materials. technical background [0002] al 2 (MoO 4 ) 3 belongs to A 2 (MO 4 ) 3 Compounds of structural type, where A=Y, Sc, In, Al and rare earth metals from Ho to Lu, M=W, Mo, belong to the orthorhombic crystal system, have a negative bulk thermal expansion coefficient, due to A 2 (MO 4 ) 3 The structure has a relatively large compatibility and can accommodate +3-valent cations with an ionic radius of 67.5-107.5pm. Therefore, it is possible to change the type of A ions or form different A 2 (MO 4 ) 3 The solid solution of the compound of the structure type can change the temperature at which the crystal structure type changes from the orthorhombic phase transition to the monoclinic phase, thereby preparing materials with positive, negative, or zero thermal expansion coefficients. It has potential a...

AI Technical Summary

Problems solved by technology

But the solid-state synthesis method has a lot of metal oxide impurities because the raw material mixing cloth is uniform; The shortcoming of sol-gel method, aqueous phase precipitation method, hydrothermal method, microwave method etc. is that the existence of additive is arranged or reaction time is longer (up to hours or even days)

Images