Technology for extracting iron from steel-making and ironmaking fly ash by micro-wave heating

Abstract

The invention discloses a technology for extracting iron from steel-making and ironmaking fly ash by micro-wave heating. The technology comprises procedures of evenly distributing the fly ash into mobile bed of a microwave reduction furnace, heating and cooling the fly ash; the heating procedure is orderly divided into a baking temperature zone, a preheating temperature zone, a baking temperature zone and a sintering temperature zone; the temperature is gradually improved to heat; the temperature of the baking temperature zone is 80-120 DEG C; the temperature of the preheating temperature zone is 200-600 DEG C; the temperature of the baking temperature zone is 700-1100 DEG C; the temperature of the sintering temperature zone is 1300-1550 DEG C; and the delivery speed of the mobile bed is controlled at 0.8-1.2m / m. The microwave belongs a body heating mode, is fast to heat, even to heat, and low in energy consumption; the fly ash contains carbon; the reducing agents such as carbon do not need to be added; and ferric oxide can be directly restored, so as to play the roles of saving energy sources and reducing the production cost. The microwave is a clean energy source, does not generate any pollution, and benefits for environmental protection.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a process for extracting iron from steelmaking and ironmaking dust removal ash, in particular to a technology for extracting iron from steelmaking and ironmaking dust removal dust by using microwave heating. Background technique [0002] The dedusting ash produced by the steel mill contains 50% iron oxide, 9% carbon, and the rest is mainly composed of calcium oxide, magnesium oxide, aluminum oxide, zinc, indium and so on. [0003] Currently, tunnel kiln burning coal heating method is used to separate iron from dedusting ash. This method has the following disadvantages: a. Due to the use of producer gas heating method, the heat is from the outside of the material through convection, conduction, radiation and other heat transfer methods from the surface to the inside. It takes a long time to transfer, and at the same time, it needs to heat the furnace body with a large space,...

AI Technical Summary

Problems solved by technology

[0003] Currently, tunnel kiln burning coal heating method is used to separate iron from dedusting ash. This method has the following disadvantages: a. Due to the use of producer gas heating method, the heat is from the outside of the material through convection, conduction, radiation and other heat transfer methods from the surface to the inside. It takes a long time to transfer, and at the same time, it needs to heat the furnace body with a large space, the thermal efficiency is low, and there are disadvantages such as long process time and high energy consumption; b, it is easy to cause uneven distribution of materials, difficult to control product quality, and easy to occur Burning, over-burning; c. It needs to consume a lot of coal during production, which pollutes the environment and has high production costs