Sodium Silicate → Sodium orthosilicate

Participants

Reaction Steps

A phyllosilicate was prepared as in EP-A-0 731 058 by dissolving 1319 g of disodium hydrogenphosphate dihydrate in 60 kg of water glass having a percentage composition Na2O/SiO2/H2O=15.3/29.7/55 (% by weight), and the solution was spray-dried in a laboratory spray drier (spray tower) from Anhydro to give an amorphous sodium silicate with an active substance content of 83%. 15 kg of the amorphous sodium silicate were heat-treated at 720° C. for 90 min in a muffle furnace (Narbertherm, model W1000/H). This was repeated once more. The cooled silicate powder (about 24 kg) was pulverized using a jaw crusher and a disk mill. 2.55 kg of the silicate powder were mixed with 450 g of Arbocell FIC 200 in a tumble mixer. The mixture was compacted in accordance with the general procedures “Roll compaction” at a pressure of 60 kN, and processed in accordance with the general procedure “Production of particle size fractions” to give a particle size fraction of from 500 to 1000 μm.

Provenance & Evidence