Effect of water vapor pressure on the phase composition of lithium monoaluminates formed in the interaction of aluminum hydroxide and lithium carbonate

• Published in: Russian journal of applied chemistry Vol. 90; no. 8; pp. 1219 - 1224
• Main Authors: Isupov, V. P., Bulina, N. V., Borodulina, I. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-08-2017; Springer Nature B.V
• Subjects: Aluminum; Aluminum base alloys; Aluminum hydroxide; Bayer process; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Gibbsite; Helium; Humidity; Industrial Chemistry/Chemical Engineering; Inorganic Synthesis and Industrial Inorganic Chemistry; Lithium; Lithium carbonate; Phase composition; Pressure effects; Vapor pressure; Vapors; Water pressure; Water vapor
• ISSN: 1070-4272; 1608-3296
• DOI: 10.1134/S1070427217080043

It is shown that the partial water vapor pressure affects the phase composition of lithium monoaluminates formed when aluminum hydroxide (gibbsite) and lithium carbonate are heated in air, in the atmosphere of helium, and in a dynamic vacuum. When the mixture is heated to 800°C in an air atmosphere with partial water pressure of 1300 Pa, a nearly single-phase lithium monoaluminate α-LiAlO
2
is formed. In the reaction in the atmosphere of helium, in which the partial water vapor pressure does not exceed 4 Pa, γ-LiAlO
2
is formed together with α-LiAlO
2
, with the content of the former exceeding that produced in the reaction in air. When the mixture is heated under dynamic vacuum conditions with partial water vapor pressure lower than 0.1 Pa, mostly γ-LiAlO
2
is formed.