The Production Of Manganese Metal Powder
High pressure jet mill is a kind of mature super fine crushing technology which metal powder supplier produce metal manganese powder
. It uses high-speed airflow energy make particle impact mutually, collision and friction, leading to the grain crushing.
High-speed airflow is through the installation in the mill around the nozzle produced by high pressure air after extrusion swell. Due to the nozzle nearby velocity gradient is very high, the majority of crushing effect occurred around the nozzle. In the milling chamber, the collision of particles and particles is far more than the collision of particles and wall, namely that the main airflow mill is crushing effect between particles impact or collision. Jet mill is one of the most commonly used super fine crushing equipment manufacturing, product fineness general can reach 1 ~ 5 m, the product particle size limit mixing flow is depends on the solid content, and unit energy consumption is inversely proportional. Solid content is lower, the product particle size is small. Airflow pulverization products with characteristic like narrow particle size distribution, particle surface smooth, particle shape rules, high purity, active, good dispersion and so on. And process in the closed system with high automation, simple operation, inert gas protection, there is little fire, explosion accidents and less dust generation, to protect the environment better. Its defect is the material requirements of fine grain, productivity is low, relatively, it is high cost.
With jet mill for grinding, in addition to jet mill itself, also have the auxiliary equipment, the auxiliary equipment includes current generating equipment, air purification equipment and processing equipment, charging equipment, product collection equipment, exhaust gas flow entrained material capture recovery equipment, dust removal equipment, etc. Because metal manganese powder is inflammable and explosive, so it must use inert gas flow crushing, process layout characteristics should guarantee the inert gas recycling.
High pressure roller grinding produce metal manganese powder: high pressure roller mill is a relatively new grinding equipment, with advantages like high efficiency, low energy consumption, wear light, the noise is small, easy operation, application scope etc.
High pressure roller mill is mainly composed of feeding device, material level control device, roller (a constant roller, a dynamic roll), transmission device (motor, pulley, gear shaft), hydraulic system, transverse leakage-proof device and so on.
The material of high pressure roller mill supplied by feeding device (gravity or preloading spiral feeder), in the counter rotating two roller between, particles because of their mutual extrusion and shattered, in more than 50 mpa pressure under the action of stress, most be crushed material through the two roller between the minimum clearance broken effectively.
Two roller, one is a bearing in bearing fixed roller, the other is a movement of the roller, through dynamic roll to material layer on abrasive force , two roller counter rotating at the same speed, roller ends with sealing device to prevent material in high pressure from roller under the action of lateral clearance of leak out. Due to high pressure roller mill unique working principle, make it suitable for grinding various kinds of different hardness of brittle material.
Metal manganese is hard and brittle, is comparatively suitable to use high pressure roller mill grinding, with high pressure roller produce manganese powder, not only the production efficiency is high, but also easy to system seal dust explosion.
Mixing mill production manganese powder: mixing mill generally must exist liquid medium, is suitable for the preparation of manganese powder, when manganese powder used in the production of chemical products, in the next stage is subject to wet processing, often using agitating mill, and have a water medium exist, then also need to pay attention to eliminate hydrogen security hidden danger. Because of manganese powder and water reaction hydrogen release, especially in the grinding process, a new form of manganese powder and water reaction more intense, workshop should it is strictly prohibited to fireworks, and well ventilated.
Oxidation manganese powder production: oxidation manganese powder is in ordinary electrolytic manganese powder surface form a layer of oxidation film, prevent it contact with air and further oxidation. Production oxidation manganese powder of the key steps has three aspects: one is the low oxygen electrolytic manganese powder production; second is oxidation process also the manganese powder surface passivation process; third is dry, drying temperature should not exorbitant, and should be protected by inert gas.
Source:http://www.mhcmp.com
by: anelwew
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