Sodium Carbonate → Sodium orthosilicate

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Reaction Steps

A crystalline alkali metal phyllosilicate, as described on page 2, was prepared by dissolving 810 g of anhydrous sodium carbonate in 60 kg of water glass having a percentage composition Na2O/SiO2/H2O=15.3/29.7/55. The solution was spray-dried in a laboratory spray drier (spray tower) from Anhydro to give an amorphous sodium silicate having an active substance content of 82%. 15 kg of the amorphous sodium silicate were heat-treated at 720° C. for 90 min in a muffle furnace (Nabertherm, model W1000/H). This was repeated once more. The cooled silicate powder (about 24 kg) was pulverized with a jaw crusher and a disk mill. 2.55 kg of the silicate powder were mixed with of Arbocell FIC 200 in a tumble mixer. The mixture was compacted in accordance with the general procedures “Roll compaction” at a pressure of 20 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