Electrolytic manganese metal deposition process is cathode Mn products. Since the manganese potential is very negative (-1.18V), and the Mn 2+ hydrolysis pH Ó¨ 25 is 7.655, the pH Ó¨ 70 is 6.65. In order to increase the hydrolysis pH and improve the current efficiency, the electrolyte must maintain high (NH 4 ) 2 SO. 4 content, its role is: 1 the formation of manganese ligand ions, improve the pH value of Mn 2+ hydrolysis, so that Mn 2+ is not easy to hydrolyze, see Figure; 2 buffering; 3 increase the conductivity of the solution. The normal electrolysis operation cannot be maintained without adding (NH 4 ) 2 SO 4 . The ratio of mineral acid to mass (mass ratio) of MnCO 3 ore fines is 1:0.55~0.6. Main technical conditions for leaching of MnCO 3 ore: THIS ITEMS ARE ALL SPARE PARRS USED ON HOWO TRUCK ,PRDUCTS INCLUDES ENGINE ,VALVES ,Brake Chambers,PISTONS,ENGINE RINGS ,BODY PARTS ,REDIATORS AND SO ON .ALL THE SPARE PARTS USED BY HOWO TRUCK SHANGQIU FLAT WORLD MACHINERY CO.,LTD , https://www.flatworldtrucks.com
The requirement of (NH 4 ) 2 SO 4 content is related to the use of antioxidants in electrolysis. For example, SeO 2 is used as an antioxidant, and the content of (NH 4 ) 2 SO 4 is 100-120 g/L, such as using SO 2 as an antioxidant. The dosage of (NH 4 ) 2 SO 4 needs to be 130~140g/L.
The main reaction formula of MnCO 3 ore leaching is MnCO 3 +H 2 SO 4 ===MnSO 4 +H 2 O+CO 2 ↑
Fe 3 O 4 +4H 2 SO 4 ===FeSO 4 +Fe 2 (SO 4 ) 3 +4H 2 O
FeO+H 2 SO 4 ===FeSO 4 +H 2 O
CuO+H 2 SO 4 ===CuSO 4 +H 2 O
CoO+H 2 SO 4 ===CoSO 4 +H 2 O
NiO+H 2 SO 4 ===NiSO 4 +H 2 O
MgO+H 2 SO 4 === MgSO 4 +H 2 O
Calculated according to the requirement of leaching solution containing Mn40kg/m 3 , the calculation formula of manganese carbonate ore powder is 
Temperature: 1 is not heated, the heat of H 2 SO 4 can be used to raise the slurry to 55~65 °C. 2 external heating to 80 ° C
Liquid to solid ratio: 8~10:1
Leaching acid: 70~80g/L
Leaching end point pH: 1.5
Leaching time: 2~3h
Leaching of manganese ore