Method for preparing primary reduction iron powder by combining inner and outer carbon matching and microwave heating

Abstract

The invention provides a method for preparing primary reduction iron powder by combining inner and outer carbon matching and microwave heating and belongs to the technical fields of microwave metallurgy and powdery metallurgy. The method comprises the following steps of: crushing raw materials including an iron-containing raw material, wood charcoal, coal and a CaCO3 raw material and carrying out layered material distribution, wherein a bottom layer is a mixture of the coal and the CaCO3 raw material, a middle layer is a mixture of the wood charcoal and the iron-containing raw material, and an upper layer is the coal; placing the distributed materials into a microwave reactor to be heated to be at 1000-1200 DEG C and keeping the heat for 5-60 minutes; and then cooling, crushing, sieving and carrying out wet type magnetic selection on reduced furnace materials, and drying to obtain the primary reduction iron powder. The method disclosed by the invention enables a process for preparing the high-grade primary reduction iron powder to be relatively reasonable; a unique material distribution manner and the rapid microwave heating are effectively combined so that the quality of primary reduction iron powder is guaranteed, the heat-preservation time is greatly shortened, the energy consumption is reduced and the production efficiency is improved; and the method can be used for rapidly producing the good-quality primary reduction iron powder.

Description

technical field [0001] The invention belongs to the technical fields of microwave metallurgy and powder metallurgy, and relates to a method for preparing primary reduced iron powder by combining internal and external carbon blending and microwave heating. Background technique [0002] Powder metallurgy technology was invented nearly 100 years ago, and it was still in its infancy until half a century ago. During World War II, the leading products of powder metallurgy were bronze and self-lubricating bearings. Iron powder also came out during this period and became a symbolic raw material for the continuous development of powder metallurgy. [0003] The types of iron powder are developed from atomized iron powder (Hametag process) to electrolytic iron powder (Husqvarna Company), and then to reduced iron powder. In 1945, magnetic separation and secondary hydrogen reduction were carried out on the primary reduced iron powder for the first time, so that the compressibility of t...

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Problems solved by technology

[0006] Traditional heating is mainly carried out by conduction heat transfer, radiation heat transfer and mass transfer heat transfer. The heat transfer is slow. When the endothermic reaction is intense, the heat cannot be replenished in time, which limits the rapid progress of the reaction, which in turn makes the production cycle longer and There is a jamming situation