Some of a Mn-Zn ferrite ultrafine powder preparation methods, using the following steps:
(A). Manganese, zinc, iron salt solution quantitative mixing, trickle-down sodium hydroxide solution, the control system, pH value 9.0, continue stirring, aging, are manganese - zinc - molten iron gel;
(B). Will Manganese - Zinc - Iron gel filtration, washing;
(C). And then use a low-carbon organic alcohol to alcohol-water exchange of the filter cake obtained alcohol gel;
(D). Alcohol gel will be placed in autoclave incorporating a low-carbon organic alcohol as extraction agent, with nitrogen purge, sealed heating above the critical temperature of 10-50 ? organic alcohol and the critical pressure of 10-30atm solvent within the framework of Removal of the last to be aerogels.
(E). Aerogels powder will be within the framework of 700-1000 ?, under the protection of high-purity nitrogen sintered 3-8 hours, with the furnace cooling, get product. With easy to operate, simple process, saving energy and so on.