Synthesis method of hercynite powder

The invention belongs to the technical field of preparation of materials and relates to a synthesis method of hercynite powder. The synthesis method comprises specific steps as follows: (1), ferrous sulfate and aluminum sulfate are weighed in a certain mass ratio and put in a corundum crucible reactor, a certain amount of boiled distilled water with oxygen removed is added to the reactor, drops of kerosene are added to the reactor, and the mixture is stirred until ferrous sulfate and aluminum sulfate are dissolved; (2), boiled distilled water with oxygen removed is used for preparation of an ammonium bicarbonate solution in a certain mass concentration, the ammonium bicarbonate solution is sucked with a rubber cap dropper, the pointed end of the dropper is inserted under the liquid level of kerosene in the reactor, a certain quantity of ammonium bicarbonate solution is dropwise and slowly added, and the mixture is quickly stirred; (3), centrifugal precipitation is performed after a complete reaction, a supernatant liquid between precipitates and an oil layer is sucked out with the rubber cap dropper, the precipitates are sintered in a nitrogen atmosphere under the protection of an oil layer, and hercynite powder with a small grain size is obtained. The process is simple, synthesis conditions are easy to control, the synthesis temperature is low, and the diameter of synthesized hercynite particles is in a submicron order range.