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:
I:Summany
TQZ85 series air float auto centering valve seat Boring Machine domestic initiative machine.
TOZ85 series air float auto-centering valve seat boring machine is a kind of high precisionand efficiency special machine with tool grinder and vacuum testing for workpiece it's suitable for rebuilding and repairing kinds of valve seat and valve rod hole of engine cylinder head. It has been sold to more than 30 countries and areas and win high reputation at home and abroa.
Valve Seat Fine Boring Machine Valve Seat Fine Boring Machine,Valve Seat Cutting Tool,Valve Seat Grinder,Valve Cutting Tool NingXia DaHe Machine Tool (Group) Imp And Exp Co.,Ltd , https://www.nxdhjcmachine.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
★Air floating, auto-centering vacuum clamping, high accuracy ,Frequency motor spindle, stepless speed
★Regrinding cutter with machine grinder, Supply vacuum test device for checking the valve tightness, Widely used, rapid clamping rotary fixture
★Supply all kinds angle cutter according order
Leaching of manganese ore
II: Machine Features