Low silicon electrolytic metal, passivation manganese powder and dehydrogenation manganese

With the rapid development of world's modern industry, there are continuously improving requirements for quality of the electronics industrial products. Therefore, quality requirements of the electronic products’ raw materials also enter into a higher stage. Ferrite soft magnetic materials are the main raw materials of electronic industrial products. Their quality largely determines the performance of electronic products.

Manganese tetroxide quality affects the performance of soft magnetic materials to some extent. And the quality of the oxide of manganese depends on the quality of the EMM to a greater extent. China's current production of manganese tetroxide production process is the use of electrolytic manganese powder and boron powder aqueous solution of oxidation in the system, some of the harmful impurities in the raw materials and some can be removed, some were difficult to remove. Individual harmful elements - silicon will increase in the production process of the manganese tetroxide. Soft magnetic materials manufacturers have strict requirements on the silicon content of manganese tetroxide. At present, the silicon content in the production of selenium manganese company's products are mostly in the SiO2 content in 200 ¼g / g, more than 100 ~ 150¼g / g. At present, few companies can produce silicon is less than 25¼g / g manganese products can meet the requirements of the production of high purity manganese tetroxide.

With the development of the ARC, the application of electrode becomes more and more widely. In addition to containing slag composition, there are10% to 20% of 0 to 0.5mm powder made from ferromanganese or manganese metal. The function of manganese in welding: to prevent the liquid metal of the weld to absorb the gas, when the metal absorb oxygen from the oxygen agent, in addition, both desulfurization and for alloy additive use. To be used under some conditions, there are strict requirements on weld strength, low carbon and oxygen-containing manganese powder, and exposure is not easily oxidized in the air and into the water. This manganese powder after passivation treatment, after treatment, the oxygen content of the manganese powder in the range of 0.4% to 0.5%, and difficult to re-aeration. Passivation of manganese metal powder is the piece of electrolytic manganese metal crushed into powder, and then to the passivation process is simple. At present, the global demand for manganese on the passivation about 2000t / a, the main producing countries of South Africa and China.

Manganese metal can be electrolytic precipitated from aqueous solution of manganese sulfate. Due to the two of hydrogen evolution reactions of cathode exist at the same time, although in the actual operation many measures are taken to inhibit the hydrogen evolution, hydrogen evolution reaction can not be completely avoided. Especially in summer metal powder supplier’s production, with high electrolytic bath temperature, the hydrogen evolution reaction becomes more serious. Therefore, the electrolytic manganese metal in cathode precipitation will always entrain adsorb a certain amount of hydrogen. The general hydrogen content is 0.015% to 0.020%. In some special cases, the requirements of EMM in the hydrogen content are 0.001% to 0.0006%. It is not impossible for EMM to achieve this requirement without dehydrogenation treatment. Because hydrogen and manganese do not generate compounds and just only adsorption or entrainment, the manganese metal piece can take off most of the hydrogen under vacuum to 550 ~ 650 .

Source:http://www.mhcmp.com