Alkaline powder for treating leaked hydrochloric acid and acid mist thereof and preparation method of alkaline powder

The invention provides alkaline powder for treating leaked hydrochloric acid and acid mist of the leaked hydrochloric acid and a preparation method of the alkaline powder. The alkaline powder is prepared from a neutralizer, an aid, a volatilization inhibitor, a moisture-proof agent, a dispersant and an indicator in a certain ratio by a specific method. The raw materials for preparing the alkaline powder are readily available, wherein a part of raw materials are reutilized wastes; the preparation method is simple, convenient and low in energy consumption; and the prepared powder has good moisture-proof performance, does not cake, and has good settling performance after being sprayed. The alkaline powder can be used for effectively treating the leaked sulfuric acid of which the concentration is 20 to 38 percent or more, can inhibit the volatilization of the hydrochloric acid and arrest the acid mist gas generated by the leaked hydrochloric acid, has the advantages of high neutralizing speed, simplicity and convenience in endpoint judgment and the like, and can effectively inhibit the volatilization of the hydrochloric acid gas; and the residue after the treatment is grey, loose and easy to clean or is easily sucked by negative pressure.