Manganous Oxide Feed Grade Specifications

Grade	MnO	Mn02	Fe as FeO	Si02	Pb	As	Cd	Hg	Ni
78-80	+62% Mn	2% Max	4-5% Min	2-%Max	30 ppm	30 ppm	Nil	Nil	200 ppm
76-78	+60% Mn	2% Max	5%    Min	3.5 Max	50 ppm	50 ppm	Nil	Nil	200 ppm
72.74	+56% Mn	2% Max	7%    Min	4.5 Max	50 ppm	50 ppm	Nil	Nil	150 ppm
62-65	+55% Mn	2% Max	12% Min	6.5 Max	80 ppm	100 ppm	Nil	Nil	100 ppm
36-38	+32% Mn	2% Max	32%  Min	6.5 Max	80 ppm	100 ppm	Nil	Nil	200 ppm

Activity test with w/w H2SO4 diluted in Distilled water for determination of Extractable Manganese %

Grade MnO	Mn (T)	Fe (T)	Extractable       Mn	Solubility of      Fe	Ph	% Extraction Mn
78-80	62% Min	4%   Min	53.5	2.5	1.84	+ 86 %
76-78	61% Min	5%   Min	50.5	2.5	2.14	+ 82 %
72-74	58% Min	7%   Min	45.02	4.4	1.86	+ 77 %
62-65	55% Min	10% Min	43.70	6.5	1.76	+ 78 %
36-38	32% Min	36% Min	26.10	29.5	1.70	+ 80 %

The above test is for chemical manufacturers to determine solubility of Manganese & Iron in mild Sulphuric acid for determination of efficiency in Industrial production of salts, chemicals & compounds and economic evaluation of raw material used.

Procedure : 10 grams specimen sample is digested at 90 C for 1½ hrs. in 10 grams of H2So4 diluted in distilled water. Iron & Manganese titrated with KMn04. For titrating Mn; Iron is precipitated by adding ZnO and solution filtered before titration.