Sodium Carbonate → Sodium carbonate sulfate

Participants

Reaction Steps

The spent leaching liquor containing sodium sulphate and non-reacted sodium carbonate in an approximately 7/1 weight ratio is subjected to fractional crystallization by cooling the said solution to 18 degrees Centigrade to precipitate deca-hydrated sodium sulfate Na2SO4.10 H2O and leaving a sodium sulfate-sodium carbonate saturated solution containing about equal parts of both said chemical species. The crystallized solid, that accounts for the 59% by weight of the spent solution, is separated from the saturated solution by any of the usual solid-liquid separation techniques. The saturated solution resulting from the solid-liquid separation, that accounts for the remaining 41% by weight of the spent solution, is reconditioned by diluting every part of the solution with 4 parts of fresh water and reconditioning it with soda ash for recycling to the celestite leaching stage.

Provenance & Evidence