Method for preparing manganese sulfate from leaching slag of electrolytic manganese metal
A technology for electrolysis of metal manganese and leaching of slag, applied in the direction of improving process efficiency, etc., can solve the problems that manganese sulfate is difficult to meet the quality standard of nickel-cobalt-manganese secondary positive electrode material, large equipment investment, and high operation requirements, and achieves significant ecological benefits and Environmental benefits, less equipment investment, and broad application prospects
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[0021] Kind of like figure 1 The method for preparing manganese sulfate using electrolytic metal manganese leaching residue of the present invention includes the following steps:
[0022] 1. Preparation of manganese carbonate: using a washing solution of electrolytic manganese leaching residue in a certain electrolytic manganese process as a raw material, after testing, the washing solution contains Mn 37.82g / L, containing (NH 4 ) 2 SO 4 91.82g / L, then precipitate the washing solution with ammonium bicarbonate. The amount of ammonium bicarbonate is 1.1 times the theoretical amount. The temperature during precipitation is 40°C and the stirring time is 30min. After filtration and separation, manganese carbonate precipitation and precipitation residue are obtained. (Ammonium sulfate is mainly contained in the remaining precipitation liquid). The reaction principle of this step is:
[0023] MnSO 4 +2NH 4 HCO 3 =MnCO 3 +(NH 4 ) 2 SO 4 +H 2 O+CO 2 ↑.
[0024] 2. Dissolv...
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