Hydrotalcite synthesis via co-precipitation reactions using MgO and Al(OH)(3) precursors

作者：Salomao Rafael^*; Milena L M; Wakamatsu M H; Pandolfelli Victor C

来源：Ceramics International, 2011, 37(8): 3063-3070.

DOI：10.1016/j.ceramint.2011.05.034

• Hydrotalcite
• Magnesium oxide
• Aluminum hydroxide
• Hydration

Hydrotalcite (Mg6Al2(OH)(16)(CO3)center dot 4H(2)O), also known as aluminum magnesium layered double hydroxide (LDH) or anionic clay, is a synthetic compound that was broadly investigated in the past decade due to its many potential applications, such as clinic anti-acid, catalyst support, adsorptive flotation, flame retardant, acid scavengers in polymer composites and as a raw material for high temperature insulating porous ceramics. This compound is usually produced by controlled chemical equilibrium shifting processes (such as co-precipitation) that requires various other purification steps (centrifugation, for example) and careful drying (freeze drying or ultrafiltration). In this paper, a novel route to synthesize hydrotalcite is presented, based on the hydration, dissolution and co-precipitation reactions carried out almost simultaneously in aqueous suspension containing reactive magnesium oxide and aluminum hydroxide. Compared to other methods (the regular co-precipitation, particularly), it presents various technological advantages such as low time-energy consumption, no further purification step requirement, high output and competitive production costs.

• 出版日期2011-12