Method for modifying natural zeolite powder

The invention discloses a method for modifying natural zeolite powder, which uses an inorganic alkali and sodium chloride as modification medicaments to modify the natural zeolite powder by a solution soaking method. The method comprises the following steps: firstly, mixing the natural zeolite powder and the sodium chloride, soaking the mixture in sodium hydroxide solution for an adsorption reaction, washing the product of the absorption reaction with water till the pH value of the product is neutral after the reaction is finished; and secondly, drying the product of the absorption reaction to obtain modified zeolite powder. The modification method of the invention avoids the use of organic acids and the production of toxic and harmful substances, effectively prevents low-concentration ammonian pollution of the raw water of drinking water without changing the prior drinking water treatment process, does not change the pH value of the raw water after being used, does not exert influence on the subsequent processes, and improves the ammonian adsorption performance of the modified zeolite powder by 30 to 80 percent.