1. The mechanical milling and crushing method is mainly a processing method for making magnesium powder by cutting, breaking chips and granulating. It is also the processing method used by most magnesium powder factories at present. It mainly produces magnesium powder and magnesium chips with large particle size., Magnesium particles, etc.
2. The atomization method is mainly to atomize the molten magnesium ingots into liquid beads by the atomizing medium sprayed from different nozzles of the same nozzle when the magnesium ingot is sprayed from the nozzle, and then solidify into powders of different sizes in the cooling chamber. The magnesium powder produced by this production method is relatively fine and has a good ball forming rate, which is mainly used in military industry and petroleum industry.
3. Emulsification method, the production process is to stir the boron-containing liquid flux and molten magnesium evenly, so that the magnesium is emulsified into a fine spherical shape in the flux, and after solidification, it is ground and sieved to become magnesium coated with salt Powder, spherical, particle size is 20 mesh to 50 mesh.
1. Large-grained magnesium granules or magnesium beans, which generally refer to large-grained magnesium granules above 1.5mm. There are two main production methods. One is the large-grained magnesium granules screened out through conventional milling and granulation. This production cost is relatively low, the efficiency is low, and the particle size is limited to less than 3mm. The other is to use magnesium ingots to melt and cast and extrude magnesium wires, and then cut and shot blast granules. Products with specific particle sizes have high production efficiency, good pelleting rate, and relatively uniform particle sizes. Magnesium ball is mainly used in the water treatment industry for the preparation of hydrogen-rich water.
2. Conventional pure magnesium powder, the general specification is 20-80 mesh, 12-40 mesh. The main purpose is to be used as a desulfurizer in steelmaking, and to be used in combination with other alloys in ductile cast iron. It can be used as a reducing agent in rare metals to purify and spheroidize.
3. Passivated magnesium powder, the general specification is 20-80 mesh, 12-40 mesh; the price of passivated magnesium powder is lower than that of pure magnesium powder, generally mainly depends on the magnesium content, conventional 97%, 95%, 92%, 90%
There are two main passivation methods. One is the chemical reaction method, the magnesium on the surface of the magnesium particles reacts with the passivating agent to form a dense reaction product film layer covering, this method has a good uniform passivation layer effect, but some metal magnesium will Loss, high cost; Another way is physical passivation, which is to fully stir the magnesium particles with silicone oil and lime, so that the lime forms a covering film on the surface of the magnesium particles. The passivation effect of this method is uneven, and the passivation The chemical effect is poor, but there is no loss of metal magnesium, and the cost is low.
Passivated magnesium powder is mainly used for desulfurization of molten steel. After passivation treatment, magnesium powder can improve the utilization rate of magnesium, reduce the diffusion speed of magnesium bubbles, avoid the splashing caused by the instantaneous vaporization of magnesium particles when entering molten steel, and accelerate the process of magnesium desulfurization. Dissolving in molten iron improves the utilization rate of magnesium.
4. Magnesium shavings, the general specification is 2*3*0.5mm, this is the initial product for the production of magnesium granules. Magnesium ingots are used to directly mill and break swarf, and then sieve and pack without going through the granulation process.It is mainly used for the production of Grignard reagent, which is a kind of metal organic halide, such as ethyl magnesium chloride, used in organic synthetic drugs, perfume and other fine chemical products; in addition, it can also be used as a desulfurizer in metallurgy. It can also be used as lighting agent, flash powder, etc.
5. Magnesium fine powder, there are two main production methods. One is sifted out from the magnesium powder processed by conventional milling chip breaking and granulation, the output is low and it needs to be accumulated for a long time; The other is It is atomized magnesium powder. This kind of fine powder has good ball forming rate, high production cost and expensive price. It is generally used in medicine and 3D printing. Magnesium fine powder is mainly used in signal flares, flares, blasting and camera flashes, and also as welding rods. Used in additives and refractories.
6. Magnesium alloy shavings. The main products are AZ91 magnesium alloy shavings, which are also processed by mechanical milling and chip breaking. The general size is similar to that of magnesium shavings. They are mainly used as raw materials for semi-solid injection molding of magnesium alloy parts.
7. Magnesium-aluminum alloy powder, the main processing method is to melt and alloy aluminum ingots (or waste materials containing aluminum) and magnesium ingots (or waste materials containing magnesium), cool and crush them, and grind them into fine powder by ball mill. The general specification from 30 mesh to 350 mesh. Generally, fireworks use 80-160 mesh specifications. It is mainly used as a luminescent agent in fireworks, as flares, signal flares, and incendiary bombs in military industry, and can also be used in refractory materials such as magnesia carbon bricks.
