Efficient reduction iron powder forming process

Abstract

The invention provides an efficient reduction iron powder forming process. The efficient reduction iron powder forming process includes the following steps that iron fine powder subjected to direct reduction and ore grinding-magnetic separation by a rotary hearth furnace is dried until the moisture content reaches 3%-5%; the dried iron fine powder and an inorganic binder are evenly mixed at a normal temperature in proportion so that a mixture can be obtained; the weight ratio of the iron fine powder to the inorganic binder is 30-40:1; the obtained mixture is fed into a high-pressure ball press machine for extrusion forming, so that iron blocks are obtained; and the obtained iron blocks are fed into a maintenance workshop, so that product reduction iron blocks are obtained, and the maintenance time is 24h. According to the efficient reduction iron powder forming process, no specific requirement for the iron fine powder quality exists, the source of the binder is wide, and cost is low. Technological operation is easy, the equipment requirement is simple, cost is low, full automation is realized, production capacity is high and the cost is reduced. The quality homogeneity of formed mixture material blocks is good, and compressive strength is high. The reduction iron fine powder subjected to ore grinding-magnetic separation is used as a breakthrough, and thus extrusion forming of superfine iron powder is achieved. The reduction iron blocks prepared through the process can completely meet the requirements for loading, unloading and transport strength.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-efficiency reduced iron powder molding process. Background technique [0002] Rotary hearth furnace direct reduction, as one of the main technologies of non-blast furnace ironmaking, has attracted widespread attention due to its advantages such as simple process flow and good economy. In this process, the iron-containing raw materials, coal powder, binder, etc. are mixed by a mixer, and then pelletized by a pelletizer, and the green pellets are dried and preheated, and then enter the rotary hearth furnace, and the temperature in the furnace is 1200°C The reduction zone at -1300°C reduces the carbon-containing pellets to direct reduced iron pellets, and the direct reduced iron pellets are subjected to grinding and magnetic separation to produce iron concentrate powder. At this time, the iron concentrate powder contains 10% water. [0003] The iron block is t...

AI Technical Summary

Problems solved by technology

The invention solves the problem that the ultra-fine reduced iron powder is difficult to form, and aims to overcome the problem that the direct reduced iron after the rotary hearth furnace direct reduction-grinding magnetic separation is difficult to transport and easy to break during the process of loading, unloading and transportation, saving costs and reducing energy consumption. Provide a treatment process to improve the falling strength and compressive strength of reduced iron blocks under the premise of reducing energy consumption

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