Application and preparation of manganese carbide Mn3C

Overview of manganese carbide Mn3C powder

Manganese carbide is a stable compound formed from manganese and carbon. The molecular formula is Mn3C, the melting point is about 1520°C, and the density is 6.89g/cm3. Heat of generation △fHm (298K)=-(15.06±12.55)kJ/mol. When smelting high-carbon ferromanganese or manganese-silicon alloy in a blast furnace or electric furnace, what is obtained is not pure manganese or manganese silicide, but manganese carbide. Therefore, the heat absorbed by the reaction is less than that of reduction to metallic manganese or manganese silicide. The reaction start temperature is low. Therefore, high carbon ferromanganese contains more carbon. When smelting silico-manganese alloys, the generated manganese carbide Mn3C encounters silicon to generate silicide MnSi, which is more stable than Mn3C, and the carbon in Mn3C is squeezed out to obtain a manganese-silicon alloy. The existing technology of smelting manganese metal and graphite to prepare manganese carbide has the following problems: 1) The raw materials are demanding, and electrolytic manganese metal is used as the raw material.

Due to the complicated preparation process of electrolytic manganese metal, manganese carbonate ore and manganese oxide ore are mainly obtained by acid hydrolysis, impurity removal and electrolysis. The manganese carbonate ore acid leaching method can directly use the chemical reaction of sulfuric acid and manganese carbonate to prepare manganese sulfate solution, and then prepare the electrolyte through a series of processes such as neutralization, purification, and filtration, and add additives such as selenium dioxide, ammonium sulfite, etc. Can enter the electrolytic cell for electrolysis; the process of manganese oxide reduction-acid leaching method to produce electrolytic manganese is different from the production process of manganese carbonate. The main reason is that manganese dioxide does not react with sulfuric acid under normal conditions and must be treated as divalent manganese Then it reacts with sulfuric acid to prepare a manganese sulfate solution. The treatment method is generally roasting, which is to mix manganese dioxide and a reducing substance (usually coal) together and then heat it in a sealed manner. C reduces the tetravalent manganese to two at a certain temperature. Manganese is smashed and then acid leached and impurity removed to obtain electrolyte. 2) The melting temperature is high, as high as 1300℃～1500℃. According to the analysis of the Mn-C binary phase diagram, the melting point of the Mn-C system is as high as 1300°C. In order to make the reaction complete, it is necessary to ensure a high temperature, and induction furnace smelting is often used. 3) Since the whole process is in a molten state, the material and refractory materials of the roasting equipment are required to be high. At present, my country's industry is developing in the direction of environmental protection and energy conservation. Therefore, it is of great practical significance to develop a new technology for low-temperature, economical, clean and efficient preparation of manganese carbide.

Application of manganese carbide Mn3C powder

Manganese carbide Mn3C powder is used in hard coatings, indicators, welding materials, spray tools, steelmaking industry, aerospace and other fields. As a grain refiner for cermet and tungsten carbide, manganese carbide can significantly improve the properties of the alloy.

Manganese carbide can be used to prepare trimanganese tetroxide. Manganese tetroxide is one of the important raw materials for the production of manganese-zinc ferrite soft magnetic materials in the electronics industry, and it is widely used. According to reports, the manganese carbide hydrolysis method is one of the preparation methods of manganese tetroxide powder. Studies have disclosed a method for producing trimanganese tetroxide using carbon-manganese alloy, a one-step method for producing trimanganese tetroxide with low selenium and high specific surface area using carbon-manganese alloy, and the preparation of Mn3O4 nanopowder by manganese carbide hydrolysis and oxidation method. Manganese (transition metal carbide) hydrolysis and oxidation method to prepare Mn3O4 powder does not involve catalysts, acids, alkalis and other chemical reagents. Compared with electrolytic metal manganese powder suspension oxidation method to prepare Mn3O4, it is obviously a veritable green Craft. However, the preparation of manganese carbide is the key to the preparation of Mn3O4 materials by manganese carbide hydrolysis. In this method, 92% of electrolytic metal manganese (high purity) and 8% of graphite are smelted in a 50kg induction furnace (temperature up to 1500℃), and the metal manganese and graphite are placed in a graphite crucible, and the graphite is broken into fine particles. The pellets make it melt as much as possible in the liquid phase alloy, and after the charge is fully melted, it is kept for a certain period of time, and then rapidly cooled to obtain a manganese carbide alloy block. The alloy block is crushed into powder. Then the obtained manganese carbide powder is subjected to oxidative hydrolysis reaction to prepare Mn3O4 material.

In addition, manganese carbide can also be used to prepare a transformer oil, which is made from the following parts by weight of raw materials: zinc acetylacetonate 4-5, oleic acid 0.7-1, ethanol 20-24, polyimide 2-3, and ethylene two Amine 0.2-0.4, silane coupling agent KH5700.4-0.6, transformer base oil 1000-1100, polyethyleneimine 2-3, stearic acid 0.3-0.4, butyl paraben 0.8-1.2, methyl ethyl Ketone 0.4-0.6, manganese carbide 3.2-3.3, cobalt oxide 2.2-2.5, vanadium carbide 2.4-2.6, petroleum sodium sulfonate 1.3-1.5; the preparation method of the present invention is simple, the process operation is simple, suitable for large-scale production, and can be extended It improves the service life of transformer oil and reduces potential safety hazards.

Preparation of manganese carbide Mn3C powder

A method for preparing manganese carbide by gas-based reduction of manganese oxide. After mixing manganese oxide, binder and water, agglomerate and dry, and the resulting dry block is placed in a mixed atmosphere containing H2, CH4, CO and N2 , Calcined at a temperature of 1100 ~ 1300 ℃, that is, manganese carbide products. The specific steps are as follows: the mass percentage of -325 mesh size is 90% analytically pure manganese dioxide and trimanganese tetroxide, adding 0.5% CMC and 7.5% moisture to pelletizing, and then drying. The dried sample is calcined in an atmosphere of 10% CH4, 30% H2, 10% CO, and 50% N2 at a calcination temperature of 1150°C and a calcination time of 120min, and then in a N2 atmosphere. After cooling to room temperature, the calcined product obtained is a manganese carbide product, and the conversion rate of manganese dioxide is 95%. The SEM picture of manganese carbide obtained under this condition is shown in the figure:

Manganese carbide Mn3C powder price

The price of manganese carbide Mn3C powder varies randomly with factors such as production cost, transportation cost, international situation, exchange rate, and market supply and demand of manganese carbide Mn3C powder. Tanki New Materials Co., Ltd. aims to help various industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full set of customized services. If you are looking for manganese carbide Mn3C powder, please feel free to contact us for the latest price of manganese carbide Mn3C powder.

Manganese carbide Mn3C powder supplier

As a global supplier of manganese carbide Mn3C powder, Tanki New Materials Co., Ltd. has extensive experience in advanced engineering material properties, applications and cost-effective manufacturing. The company has successfully developed a series of powder materials (including boron carbide, aluminum carbide, titanium carbide, etc.), high-purity targets, functional ceramics and structural devices, and provides OEM services.