Mineralizing CO₂ as MgCO₃·3H₂O Using Abandoned MgCl₂ Based on a Coupled Reaction–Extraction–Alcohol Precipitation Process

Abstract

A novel coupled reaction–extraction–alcohol precipitation process was proposed to mineralize CO2 as MgCO3·3H2O directly by abandoned MgCl2. Rod-like crystal MgCO3·3H2O was obtained, and the conversion rate of MgCl2 increased sharply by using this novel coupled reaction–extraction–alcohol precipitation process. The effect of an added C1–C3 alcohol precipitation agent on the conversion rate of MgCl2 was in the following order: ethanol > isopropanol > n-propanol > methanol. Moreover, the optimal conditions for the highest conversion rate of MgCl2 by single-factor experiments were obtained as follows: initial concentration of MgCl2 solution is 2 mol·L–1, volume ratio of ethanol and aqueous phase is 2, mole ratio of N235 and aqueous phase is 2, volume ratio of diluent and N235 is 0.5, with a stirring rate of 300 r·min–1 at 298.15 K and at atmospheric pressure.

Recovery of Magnesium from Industrial Effluent and Its Implication on Carbon Capture and Storage

“…7,8 Natural magnesium sources are magnesium-bearing ores, for example, dolomite, magnesite, brucite, and magnesium-containing waters, for example, salt lake brines, seawater, and geothermal water. 1,9 Besides, municipal and industrial wastewater can also be a significant source of magnesium but is often neglected. 10 In fact, magnesium in wastewater is considered as a stimulant for water quality deterioration and land degradation.…”

“…Magnesium (Mg) is used in alloys with aluminum (Al) to make the cars lighter and also in new types of batteries; thus, its demand and price are predicted to grow rapidly over the next decades . The predicted high demand of magnesium is also from its high demand in other fields, for example, paper manufacturing, fertilizer production, − and water/wastewater treatment. , Natural magnesium sources are magnesium-bearing ores, for example, dolomite, magnesite, brucite, and magnesium-containing waters, for example, salt lake brines, seawater, and geothermal water. , …”

Insight into thermal dissociation of tri‐n‐octylamine hydrochloride: The key to realizing CO2 mineralization with waste calcium/magnesium chloride liquids

“…Among the various CCS methods, mineralization by converting CO 2 to carbonate minerals offers an attractive approach for the safe storage and effective utilization of CO 2 . Some Mg 2+ /Ca 2+ —rich aqueous resources, such as seawater, salt lake brines, and industrial effluents have potential application in mineralization of CO 2 .…”

“…Our research group has investigated a novel coupled reactive extraction‐crystallization process systematically to realize the storage of CO 2 with the liquid wastes, such as distiller waste containing plentiful CaCl 2 from ammonia soda process and abandoned MgCl 2 ‐rich brines after the production of potassium fertilizer from salt lake. In the process, CaCl 2 , MgCl 2 were transformed to high‐valued carbonates.…”

Mechanism studies on thermal dissociation of tri-n-octylamine hydrochloride with FTIR, TG, DSC and quantum chemical methods

“…As effective extractants, high molecular mass aliphatic water-insoluble amines, especially tertiary amines such as tri-n-octylamine (TOA), tris-(2-ethylhexyl)-amine (TEHA), N235 (a mixture of tertiary amines with carbon number 8 to 10 in each chain), are used for the extraction of HCl directly from HCl-containing solutions [1][2][3][4][5][6][7][8][9] or in the reactive extraction-crystallization coupled process of CaCl 2 , [10][11][12][13] MgCl 2 , 13,14 SrCl 2 , 15 LiCl, 16 etc. (converting them to their respective carbonates by introducing CO 2 and amine extractants, such as TOA).…”