A granular to fine-granular dry mix powder (an artificial kidney dialysate component A of uniform composition) for use in the preparation of the dialysate for bicarbonate dialysis and a method of producing the same. A granular to fine-granular Composition A comprising granules each comprised of a plurality of NaCl grains carrying KCl, CaCl2, MgCl2 and sodium acetate adhered to the surface of each grain. NaCl, KCl CaCl2, MgCl2 and sodium acetate are mixed in the presence of not less than 10 weight parts of water based on 100 weight parts of sodium acetate and the resultant mixture is heated at not less than 50 DEG C to bring the sodium acetate into a transiently molten state and mixing acetic acid with the same mixture.
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