METHOD OF INCREASING CONCENTRATION OF MAGNESIUM IONS IN SOURCE WATER Russian patent published in 2022 - IPC C02F1/68 A23L2/52 

FIELD: chemical or physical processes.

SUBSTANCE: present invention relates to a method of increasing the concentration of magnesium ions in source water, wherein: (a) providing an input stream of source water Q_IN, wherein initial water has total alkalinity (CaCO₃) from 5 to 200 mg/l; (b) increasing concentration of carbon dioxide in said input stream Q_IN to obtain a stream of initial water Q_CO2, containing carbon dioxide in concentration from 20 to 100 mg/l; (c) passing a stream of Q_CO2 through a solid layer to obtain an output stream of treated water Q_OUT. Solid layer at step (c) contains a source of magnesium ions in form of solid particles having a water solubility limit of 10 g/l or less when measured at 20 °C and 100 kPa. Magnesium ion source is selected from one or more of brucite, hydromagnesite or partially calcined dolomite, particles have weight average size in range from 0.5 to 1.5 mm, and contact time at step (c) between flow Q_CO2 and solid layer is at least 0.1 min and less than 5 min.

EFFECT: increasing concentration of magnesium ions without using highly water-soluble magnesium salts, thus avoiding introduction of undesirable anions, such as chloride or sulphate.

17 cl, 3 tbl, 18 ex