Patent ID: 9653732
Date: 2017-05-16
CPC Classifications: C01B,H01B,H01M,Y02E

Claim:
1. A process for producing a monometal or mixed-metal phosphate of the type (M1 M2 M3 . . . Mx) 3 (PO 4 ) 2 .a H 2 O with 0≦a≦9, wherein (M1, M2, M3 . . . Mx) represent the one metal of the monometal or the plurality of metals of the mixed-metal phosphate and are selected from the group consisting of Mn, Fe, Co, Ni, Sc, Ti, V, Cr, Cu, Zn, Be, Mg, Ca, Sr, Ba, Al, Zr, Hf, Re, Ru, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, with the proviso that at least one of the metals in the phosphate is selected from Mn, Fe, Co and Ni, wherein the process comprises: a) producing an aqueous solution (I), which contains at least one or more of the metals Mn, Fe, Co and/or Ni as divalent cations, by introducing oxidic metal(II)-, metal(III)- and/or metal(IV) compounds or their mixtures or compounds with mixed oxide stages selected from hydroxides, oxides, oxide-hydroxides, oxide-hydrates, carbonates and hydroxide carbonates, of at least one of the metals Mn, Fe, Co and/or Ni together with the elementary forms or alloys of at least one of the metals Mn, Fe, Co and/or Ni into an aqueous medium containing phosphoric acid, and reacting the oxidic metal compounds with elemental forms or alloys of the metals in a redox reaction to result in divalent metal ions, b) when present, removing solid substances from the resulting phosphoric-acid aqueous solution (I), c) when additional metals are desired in a mixed metal phosphate, containing a metal in addition to the metals introduced into the solution in stage a), introducing at least one additional compound of at least one of the metals (M1, M2, M3 . . . Mx), into the aqueous solution (I) in the form of an aqueous solution or in the form of a solid substance in the form of a salt, wherein the at least one additional compound is selected from hydroxides, oxides, oxide-hydroxides, oxide-hydrates, carbonates, hydroxide carbonates, carboxylates, sulphates, chlorides or nitrates of the metals, d) producing an alkali metal phosphate receiver solution (II) with a pH-value of 5 to 8 from an aqueous phosphoric acid solution by neutralisation with an aqueous alkali hydroxide solution or by dissolution of one or more alkali phosphates, e) metering the aqueous solution (I) into the receiver solution (II) and at the same time metering a basic aqueous alkali hydroxide solution that the pH-value of the resulting reaction mixture is kept in the region of 5 to 8 to precipitate phosphate of type (M1 M2 M3 . . . Mx) f) separating precipitated phosphate from the reaction mixture.