Novel production technique for preparing calcium chloride from carbide slag

The invention discloses a novel production technique for preparing calcium chloride from carbide slag. The technique comprises the following steps: 1) pouring 25-33% technical hydrochloric acid and carbide slag into a reaction tank, and mechanically stirring for 3 hours to perform neutralization reaction, thereby regulating the pH value to 8.5-9.5; 2) filtering and separating the reaction slurry obtained in the step 1) through a filtering machine, thereby preparing a calcium chloride solution; 3) delivering the calcium chloride solution obtained in the step 2) into a first concentrating tower to perform concentration and impurity removal, and standing in an aging tank for 120-168 hours; 4) pouring the supernatant into a second concentrating tower to perform concentration, delivering the concentrated liquid into a secondary filtering machine, and filtering; and 5) finally, passing the filtrate obtained by the secondary filtering machine through a spray vulcanizing drying machine to obtain the anhydrous calcium