| 摘要 |
PURPOSE:To recover efficiently product MnO2 and Mn oxide by adding hot water to the material accumulated in an electrolytic cell in the stage of producing electrolytic MnO2, adding water to the solid component recovered by a solid- liquid sepn. and stirring the mixture then recovering further the solid component by the solid-liquid sepn. thereby removing easily gypsum, etc. from the accumulated material described above. CONSTITUTION:The accumulated material consisting of a mixture composed of product MnO2 in addition to the wax, gypsum and Mn oxide produced in an electrlytic cell when the Mn oxide is suspended and electrolytic MnO2 is produced by a slurry method. More specifically, the accumulated material is separated and recovered from the electrolytic cell and thereafter water is added and th material is heated to >=70 deg.C to melt the wax, etc. and to float the same on the surface of the hot water; at the same time, CaSO4.2H2O is dissolved and extracted in the hot water. Such treated liquid is then subjected to a solid- liquid sepn. to separate the wax and CaSO4.2H2O. Water is added to the resultant sludge-like accumulated material and after thorough stirring, the material is subjected to the solid-liquid sepn., by which the product MnO2 and the raw material Mn oxide are recovered at a good yield. |
