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|1. (WO2018052220) METHOD AND FACILITY FOR PREPARING SODIUM BICARBONATE AND CALCIUM CARBONATE|
|Applicants:||RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY
INDUSTRY ACADEMIC COOPERATION FOUNDATION KEIMYUNG UNIVERSITY
|Title:||METHOD AND FACILITY FOR PREPARING SODIUM BICARBONATE AND CALCIUM CARBONATE|
According to one embodiment of the present invention, provided is a method and a facility for preparing sodium bicarbonate and calcium carbonate, comprising the steps of: producing sodium bicarbonate (NaHCO3) through a reaction of sodium hydroxide and carbon dioxide by supplying a carbon dioxide-containing gas to a sodium hydroxide (NaOH) solution; producing calcium carbonate (CaCO3) through a reaction of a carbonate ion (CO32-) and a calcium ion by supplying a calcium ion-containing solution to the filtrate remaining after recovering the sodium bicarbonate; and resupplying the filtrate remaining after recovering the calcium carbonate to a solution in which the sodium hydroxide is dissolved, wherein a sodium salt having a solubility higher than that of the sodium bicarbonate is added to the sodium hydroxide solution. According to the present invention, there are effects enabling calcium carbonate and sodium bicarbonate, which are high-value-added materials, to be produced together from industrial by-products, which are to be disposed, and preventing the problem of a dissolution rate decrease of calcium ions when implementing a continuous process.