| 简介 |
A method of recycling rare earth metals included in a waste material, wherein the method comprises acidic leaching of the waste material using a non-oxidizing acid for solubilizing at least a part of metals included in the waste material while maintaining at least a part of non-metallic materials of the waste material in solid form, separating the remaining solid components of the leached waste material from a solution of the solubilized metals, and precipitating selectively at least a part of the rare earth metals in the solution while maintaining other metals in dissolved form, wherein the precipitating comprises adding sulphates to the solution of the solubilized metals and adding an alkaline solution to the solution of the solubilized metals for increasing the pH-value. As a non-onidizing acid, it is preferable to use hydrocloric acid in a concentration between 10% and 40%. As added sulphate, sodium sulphate is advantageously used as an aqueous solution. |
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