The Cd2+ -bearing solutions prepared in laboratory were treated by natural cryptomelane. According to the experimental results, it is at least 2 days before the process can reach balance; the disposal quantities become larger when the radius of the cryptomelane becomes smaller; if the concentrations are not too high, the disposal quantities of Cd2+ by unit mass of mineral powder will increase with the increasing concentration; pH value is the dominant factor governing the disposal quantities of Cd2+ : the quantity of the treated Cd2+ gets down until reaching the minimum when the pH value is lower than 3, and then goes up and arrives at the maximum until pH value is near 11. The negative ions in the solution affect the quantity through complexation with Cd2+ ions. Within the whole range of concentration, the disposal quantities curve can be fitted well by Langmuir isotherms, with the maximum being 5.54 mg/g. The treatment of the ions by the mineral powder is accompanied by the dissolution of the Mn2+ and K + ions. When the cinders of the powder are leached, they still hold most of the Cd2+ (79.82%) separated from the solution.