METHOD FOR OBTAINING CALCIUM CARBONATE FROM MEDIA CONTAINING CALCIUM Russian patent published in 2023 - IPC C01F11/18 C01B32/60 

FIELD: chemical industry.

SUBSTANCE: invention relates to the chemical technology for the production of inorganic compounds, and in particular to methods for producing calcium carbonate. The method includes precipitation of calcium carbonate from media containing calcium chloride. As a medium containing calcium, commercial multicomponent brines of oil and gas producing enterprises are used, which are subjected to purification from oil, iron and manganese and brought into contact with calcium oxide, or calcium hydroxide, or gaseous ammonia. The precipitate of magnesium hydroxide formed during the contact is separated from the commercial brine. The commercial brine freed from magnesium is brought into contact with a saturated solution of ammonium carbonate salt, or with soda, or soda solution. The resulting precipitate of calcium carbonate is separated from the mother commercial brine enriched with ammonium chloride or sodium chloride, washed and dried. The mother enriched commercial brine of the calcium carbonate precipitation operation is used in oil production technology.

EFFECT: expansion of the range of raw materials sources, the exclusion of carbon dioxide emissions.

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