METHOD AND FACILITY FOR PREPARING SODIUM BICARBONATE AND CALCIUM CARBONATE

• Main Authors: SON, Min-Ah, KIM, Se-Hun, PARK, Du-Young, LEE, Min-Woo, HAN, Kun-Woo, KIM, Gook-Hee, LEE, Man-Su, AHN, Chi-Kyu
• Format: Patent
• Language: English; French; Korean
• Published: 22.03.2018
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; INORGANIC CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

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 (CO3 2-) 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. Selon un mode de réalisation, la présente invention concerne un procédé et une installation de préparation de bicarbonate de sodium et de carbonate de calcium, comprenant les étapes consistant à : produire du bicarbonate de sodium (NaHCO3) par réaction d'hydroxyde de sodium et de dioxyde de carbone par l'apport d'un gaz contenant du dioxyde de carbone à une solution d'hydroxyde de sodium (NaOH); produire du carbonate de calcium (CaCO3) par réaction d'un ion carbonate (CO3 2-) et d'un ion calcium par l'apport d'une solution contenant des ions calcium au filtrat restant après la récupération du bicarbonate de sodium; et réintroduire le filtrat restant après la récupération du carbonate de calcium à une solution dans laquelle l'hydroxyde de sodium est dissous, un sel de sodium ayant une solubilité supérieure à celle du bicarbonate de sodium étant ajouté à la solution d'hydroxyde de sodium. Selon la présente invention, il existe des effets permettant au carbonate de calcium et au bicarbonate de sodium, qui sont des matériaux à haute valeur ajoutée, d'être produits ensemble à partir de sous-produits industriels, qui doivent être préparés, et empêchant le problème d'une diminution du taux de dissolution d'ions calcium lors de la mise en œuvre d'un processus continu. 본 발명의 일 실시예 따르면, 수산화나트륨(NaOH) 용액에 이산화탄소 함유 가스를 공급하여 수산화나트륨과 이산화탄소의 반응으로 중조(NaHCO3)를 생산하는 단계, 상기 중조를 회수하고 남은 여액에 칼슘이온 함유 용액을 공급하여 탄산이온(CO3 2-)과 칼슘이온의 반응으로 탄산칼슘(CaCO3)을 생산하는 단계, 및 상기 탄산칼슘을 회수하고 남은 여액을 상기 수산화나트륨이 용해된 용액에 재공급하는 단계를 포함하며, 상기 수산화나트륨 용액에 상기 중조 보다 용해도가 높은 나트륨염을 더 공급하는, 중조 및 탄산칼슘 제조방법 및 제조설비를 제공하며, 이에 따르면, 버려지는 산업부산물로부터 고부가가치 물질인 탄산칼슘과 중조를 함께 생성할 수 있고, 연속 공정 구현 시 칼슘이온의 용출률이 하락하는 문제점을 방지하는 효과가 있다.