A low current EMM of silicon, one of the main purposes is electrolytic manganese metal electronic grade manganese tetroxide. Manganese tetroxide is an important component of manganese zinc ferrite soft magnetic materials, due to the rapid development of the global modern industry, the electronics industry for the quality of the product requirements continue to increase, and therefore, the quality of raw materials, production of electronic products also made more The higher the requirements. Mn-Zn ferrite soft magnetic materials are the most important raw materials for electronic industry products. The quality of electronic products determines the performance of electronic products.
The quality of trimanganese tetraoxide affects the performance of soft magnetic materials to a certain extent, and the quality of trimanganese tetraoxide depends to a large extent on the quality of electrolytic manganese.
China's current production process of trimanganese tetraoxide is produced by oxidation of electrolytic manganese metal powder aqueous solution. Some harmful impurities in the raw materials can be removed, and some are difficult to remove. Individual harmful elements - silicon will also increase in the production process of trimanganese tetraoxide. The soft magnetic material manufacturers have to trimanganese tetraoxide silicon content strict requirements, general requirements w (SiO 2) ≤100μg / g ,
even to the individual 60 ~ 80μg / g. At present, the production of selenium-containing manganese enterprise The content of silicon in the products is mostly 100~150μg/g, and the content of SiO 2 is above 200μg/g. The trimanganese tetraoxide production enterprise requires that the silicon content in the electrolytic manganese is about 30 μg/g, and it is better to reach 20 μg/g. According to the current production process of electrolytic manganese enterprises in China, the silicon content in electrolytic manganese can not meet this standard. It must be added in the process of purifying the solution to remove silicon. At the same time, it is necessary to maintain the environmental sanitation of the product site to produce low-silicon manganese metal products.
At present, there are a few companies in China that can produce electrolytic manganese products containing less than 25μg/g of silicon, which can fully meet the requirements of producing high-purity trimanganese tetraoxide.
Second, the passivation of manganese powder with the development of arc welding, the application of coated electrodes is more and more widely, in addition to containing slag composition, there are 10% to 20% made of ferromanganese or manganese metal. ~0.5mm powder. The function of manganese in welding is to prevent the liquid metal at the weld from absorbing gas, and to act as an oxygen absorbing agent when the metal absorbs oxygen, in addition to the use of desulfurization and alloying additives. Under some conditions where the weld strength is strictly required, metal manganese powder with low carbon content and low oxygen content is used, and it is not easy to be oxidized when exposed to air and placed in water. The metal manganese powder needs to be passivated, and the treated metal manganese powder has an oxygen content in the range of 0.4% to 0.5%, and is not easy to increase oxygen.
The passivated manganese metal powder is mainly pulverized into powder by electrolytic manganese metal sheet, and then passivated, and the process is simple.
At present, the global demand for passivated manganese powder is about 2000t/a, and the main producing countries are South Africa and China.
Third, dehydrogenated manganese
Electrochemical analysis of manganese from aqueous solution of manganese sulfate, due to the simultaneous reaction between manganese and hydrogen evolution in the cathode, although many measures to inhibit hydrogen evolution were taken during the actual operation, the hydrogen evolution reaction could not be completely avoided, especially in summer production, electrolysis. In the case where the bath temperature is high, the hydrogen evolution reaction is more serious. Therefore, the electrolytic manganese metal precipitated from the cathode always entrains or adsorbs a certain amount of hydrogen. Generally, the hydrogen content is between 0.015% and 0.020%. In some special cases, the hydrogen content of electrolytic manganese is required to be 0.001% to 0.0006%. Electrolytic manganese metal is not possible to achieve this requirement without dehydrogenation treatment.
Since hydrogen and manganese do not form a compound, they are only adsorbed or entrained. Therefore, it is only necessary to heat the metal manganese sheet to 550 to 650 ° C under vacuum to remove most of the hydrogen.Automatic Lathe Machine
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