Aluminum sodium dioxide

Crystal structure
Crystal structure of aluminum sodium dioxide __ Al 3+       __ Na +      __ O 2−
General
Surname	Aluminum sodium dioxide
other names	Sodium aluminate Sodium metaluminate
Ratio formula	NaAlO 2
Brief description	white odorless solid
External identifiers / databases
CAS number 1302-42-7 EC number 215-100-1 ECHA InfoCard 100,013,728 PubChem 14766 Wikidata Q411155
properties
Molar mass	81.97 g mol −1
Physical state	firmly
density	1.52 g cm −3
Melting point	1650-1850 ° C
solubility	easily in water (~ 500 g l −1 at 20 ° C)
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 290-314 EUH: 071 P: 280-305 + 351 + 338-310
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Aluminum sodium dioxide or sodium metaluminate is a chemical compound with the ratio formula NaAlO ₂ from the group of metal oxides , sodium compounds and aluminum compounds , more precisely the sodium aluminates . It crystallizes in an orthorhombic structure with space group Pna 2 ₁ (space group # 33.) Consisting eckenverküpften AlO ₄ - tetrahedra is. The Na ⁺ ions are also tetrahedrally surrounded by O ²⁻ ions.

Extraction and presentation

Sodium aluminates generally arise when sodium hydroxide solution acts on aluminum salts , with the sodium hydroxide solution being used in excess and a sodium aluminate solution being formed.

${\displaystyle \mathrm {2\ Al+2\ NaOH+2\ H_{2}O\longrightarrow } }$ ${\displaystyle \mathrm {2\ NaAlO_{2}+3\ H_{2}} }$

use

Aluminum sodium dioxide is used as a flocculant in sewage treatment , as a construction chemical ( quick hardener for concrete ) and in the manufacture of paints and soaps . The sodium aluminate solution is of far greater technical importance .

Individual evidence

1. ↑ ^{a b c d e} Entry on aluminum sodium dioxide in the GESTIS substance database of the IFA , accessed on July 23, 2016(JavaScript required) .
2. ↑ Safety data sheet for sodium aluminate Bernd Kraft. Retrieved January 1, 2018.
3. ↑ J. A. Kaduk, S.-Y. Pei: The crystal structure of hydrated sodium aluminate, Na Al O ₂ · 5/4 H ₂ O, and its dehydration product . In: Journal of Solid State Chemistry , 1995 , 115 , pp. 126-139.
4. ↑ Patent DE60001390 : Fast-setting cement containing lime and aluminates. Registered on March 2, 2000 , published on December 11, 2003 , applicant: Italcementi SpA, inventors: Umberto Costa, Lorenzo Barcella. ‌