Technique for directly reducing iron by using tunnel vehicle bottom type fast reducing furnace

Abstract

The present invention relates to fast reduction of directly reduced iron, and is especially the production process of fast reducing iron oxide in a fast no-tank reducing furnace in the bottom of a tunnel bogie to replace traditional externally heated reaction tank in a tunnel kiln. The present invention features that pressed and dried pellets are spread on bogie of the no-tank reducing furnace, rather than inside a reaction tank, for heating reduction reaction. The present invention has the direct action of the high temperature reducing atmosphere onto the iron oxide pellets in great contact area, fast reaction speed, high quality of reduced iron, greatly raised output, greatly reduced power consumption and greatly lowered production cost.

Description

Technical field: [0001] The invention relates to a rapid reduction process of direct reduced iron (also called sponge iron, metallized pellets), especially a tankless tunnel car bottom type rapid reduction furnace to replace the traditional external heat reaction tank tunnel kiln for iron oxides ( Such as ferroferric oxide magnetite and iron scale, ferric oxide hematite, basic iron carbonate siderite and sulfuric acid slag, blast furnace ash, steelmaking dust and steel rolling oily sludge, etc.) A production process for rapid reduction. Background technique: [0002] The process flow of the traditional production of direct reduced iron is shown in Figure 1. The reductant (carbon C) processed from coke powder or anthracite is mixed with the desulfurizer (lime Ca), and then the iron oxide is layered into the clay refractory. It is put into a quality or sic reaction tank, then enters a tunnel kiln, is heated to a temperature of 1100-1200°C within 30-40 hours for reduction reac...

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Problems solved by technology

In this way, because the reducing agent (carbon C) and the iron-based oxide have only a small contact surface, more importantly, the reducing agent (carbon C) and the iron-based oxide are all contained in the reaction tank, resulting in a long reaction time and reduced Incomplete, uneven, overoxidation and other consequences affect the output and quality of direct reduced iron; increase the consumption of the reaction tank itself and the cost of excessive energy consumption caused by slow heat conduction

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