Metal manganese is easily oxidized in the air and forms the oxide film on its surface. It will affect its physical properties, chemical properties and performance. When it is used in powder state, metal powder has a large surface area, and its oxidation is intensified. According to technical conditions, some provisions declare that the manganese content should not be less than 99.00% in manganese powder. Therefore it is necessary to have cooled determination of manganese content in manganese powder.

Separation method for the reduction of manganese and manganese metal in other metallurgical intermediate products although many reports, but does not apply to high-purity manganese powder. Relatively large radius of the ion of this method as an oxidant, it is difficult to spread to the surface of the metal through the metal surface into the membrane, and the reaction products are solid phase. It further hinders dissolution. The metal manganese can not be completely leaching. On the other hand, the original solvent such as Br methanol, the compounds of manganese on the surface of the fine into a very strong ability to dissolve. It lost its selection and there is no practical value.

Manganese powder in the surface oxide film oxides MnO and Mn3O4, there is almost no other high manganese oxide. Dissolved manganese metal solvent, must be maintained at pH 8-8.7, the leaching system should not be there is a strong oxidizing or reducing agent. In this condition, MnO, with the metal manganese is dissolved, Mn3O4 and other high manganese oxide solution in the ammonium salt solution (It is fastest in NH4NO3 solution), and brown manganese oxide is not dissolved. Due to the buffering effect of the ammonium salt, can keep the solution at pH 8-8.7. After leaching 100mL100g / L NH4NO3 1.5mL ammonia solution, the determination of residues in Mn3O4 by the total oxygen content in the test sample and the adsorbed oxygen content and the amount of total iron and total manganese amount to calculate the metal manganese content. The analytical procedure described below applies only to the oxygen content of less than 1.00T manganese powder sample. For different process to produce manganese analysis, metal powder supplier should have the study in surface phase firstly.

Placing 0.1000g sample in the erlenmeyer flask, then adding 100mL 100g/L NH4NO3 -.5mL ammonia solution. Please use the rubber stopper with two holes plugged to have a mixing rotor. At this time, the argon electromagnetic is needed at 42-45 ℃, leaching it in on hour. Wash it and use the four-story slow filter paper and pulp decompression filter. The residue and filter paper should be moved into the beaker of necking. Then the sulfonitric acid should be processed into solution. The determination result shows the manganese content.Source:http://www.mhcmp.com