Method for extracting crude selenium

The invention provides a method for extracting crude selenium. The method includes the steps of A), feeding sulfur dioxide and sulfite into pressing-leached slurry obtained by filtering copper-removedmud, and performing reaction to obtain mixed slurry; B), performing filter pressing on the mixed slurry to obtain filter-pressed liquid and wet copper-removed filter cake; C), performing filter pressing on the filter-pressed liquid again to obtain filter cake and filtrate; D), feeding sulfur dioxide and sulfite into the filtrate, performing reaction to obtain mixed slurry, and performing filter pressing on the mixed slurry to obtain the crude selenium. The method has the advantages that the grade of the crude selenium extracted by the method is larger than 95%, precious metal content is lowered greatly, and the problem that selenium recycled in the leaching process of anode mud cannot be sold directly is solved. 本发明提供了种提取粗硒的方法，包括以下步骤：A)向过滤脱铜泥后的压浸浆液中通入二氧化硫或亚硫酸盐，反应后得到混合浆液；B)将所述混合浆液进行压滤，得到压滤后液和湿脱铜泥滤饼；C)将所述压滤后液再次进行压滤