The preparation method of ultra-fine homogeneous aluminum powder includes aluminum ingot melting, milling, material transportation, gas-solid separation, collection of finished products, and product packaging, and is characterized by the following steps: a) Aluminium ingots are first melted in a high-speed disc atomizer in a fully-enclosed container, and atomized and powdered under the protection of the intrinsic gas; b) The atomized aluminum powder is infiltrated by the inert gas blown into the bottom of the container and the oil sprayed into the upper part of the container, and is also transported from the upper part of the container through the pipeline protected by the inert gas to the primary cyclone separator and the secondary spray screen. The tower is subjected to gas-solid separation; c) The oil immersed aluminum powder separated by a cyclone separator sinks into the bottom and the product enters the packaging drum. The gas and fine aluminum powder enter the secondary spray tower through the pipeline, and the oil-impregnated aluminum powder sinks into the bottom and returns to the container. The filter returns to the fan cycle and the circulating oil returns to the cycle again; d) Accumulated oil-infiltrated aluminum powder from the container is recovered as a product, packaged and sealed.
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