Method for producing aminopolicarboxylic acid complex powders, additives and ceramic powders

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[Problem]Provide water-soluble compounds that dissolve at a wide pH and are difficult to solidify with powder. Solution : The present invention includes an aminopolycarboxylic acid complex powder of a rare earth element having an average particle size of 1 μm or more and 1000 μm or less, and an amino polycarboxylic acid complex powder of the rare earth element, and a ceramic powder additive used for mixing with a ceramic powder. The present invention is a method for producing a ceramic powder containing a rare earth compound, and a ceramic powder production method in which the particle surface of the ceramic powder is coated with a rare earth compound by mixing moisture after mixing an aqueous solution dissolved in water with the ceramic powder. [Selection Figure]Figure 1