Method for preparing calcium bicarbonate powder by solvent method

The invention discloses a method for preparing calcium bicarbonate powder by a solvent method. The method comprises the following steps of (1) adding calcium salts into a solvent with the relative dielectric constant being smaller than 50 to obtain a solution A containing calcium ions, wherein the concentration of the calcium ions in the solution A is 1 to 140 mmol/L; (2) adding basic substances into the solvent with the relative dielectric constant being smaller than 50 to obtain a solution B, wherein the mol ratio of the basic substances in the solution B to the calcium salts in step (1) is(0.5 to 4):1; (3) after the solution A and the solution B are mixed, introducing carbon dioxide gas; performing centrifugation or filtering after white turbid liquid of calcium bicarbonate generated;after the solvent volatilization, obtaining calcium bicarbonate powder with the purity at least being 95 percent. The preparation method provided by the invention can be used for fast preparing the calcium bicarbonate by a one