Methods for producing gypsum and sodium bicarbonate
with controlled particle size - using sodium sulfate
and apparatus for producing sodium bicarbonate
(22) 16.12.2024
(43) 19.06.2025
(57) The present invention relates to methods for producing gypsum and sodium bicarbonate with controlled particle size using sodium sulfate, and an apparatus for producing sodium bicarbonate and, more specifically, to: a method for producing sodium bicarbonate, comprising the steps of producing a sodium sulfate solution containing sodium ions from a mixture of a leaching agent and a sodium sulfate-containing material, producing sodium bicarbonate (NaHCO3) by adding carbon dioxide and anunonia into the sodium sulfate solution, and controlling the particle size of the sodium bicarbonate by heating the sodium bicarbonate at a temperature of 60-100 °C; a method for producing gypsum by adding a calcium-containing material into the filtrate remaining after collecting the sodium bicarbonate in the step of producing the sodium bicarbonate; and a reactor for producing sodium bicarbonate, comprising a leach reactor in which a sodium aqueous solution is produced by leaching sodium ions from a sodium sulfate-containing material by using a leaching agent, a carbonation reactor in which a gas containing carbon dioxide or a carbonation solution and a gas containing ammonia or an ammonia solution are supplied to the sodium aqueous solution to cause a reaction which produces sodium bicarbonate (NaHCO3), and a particle size reactor in which the particle size of sodium bicarbonate is coarsened in a sodiumbicarbonate-generating aqueous solution at 60-100 °C.
(73) Research Institute Of Industrial Science & Technology [KR/KR]
