Production line and technology for producing metallized furnace burden by blast furnace gas ash

Abstract

The invention discloses a production line and a technology for producing metallized furnace burden by blast furnace gas ash and belongs to the technical field of metallurgy and mineral engineering, aiming at solving the problems of an existing technology that the grade and the metal conversion ratio of zinc oxide and the iron grade in kiln slag are relatively low, the content of the zinc oxide inthe kiln slag is too high and resources are wasted. The production line comprises a rotary kiln, a range hood, a chimney, a heat-preservation and settling chamber, a cooler, a bag-type dust collector,a cooling cylinder and a magnetic separator; the technology comprises the following steps: mixing raw materials, reducing the kiln slag, cooling the materials, carrying out magnetic selection and separation, carrying out heat preservation and settling, bonding and depositing, returning the materials and preparing the materials, carrying out dust removal and dust collection and discharging tail gas. According to the production line and the technology, disclosed by the invention, beneficial elements including iron, zinc and the like in the zinc-extracted kiln slag of the blast furnace gas ash are sufficiently utilized and the zinc-extracted kiln slag of the blast furnace gas ash are treated by adopting a rotary kiln carbon-hydrogen combined reduction and carbon circulating oxygenation reduction method; the iron grade in the treated kiln slag can reach 54 percent or more, the content of the zinc oxide reaches 0.4 percent or lower and the metal conversion rate reaches 90 percent or more;the requirements on converter production are completely met.

Description

Technical field [0001] The invention belongs to the technical field of metallurgy and mineral engineering, and particularly relates to a production line and process for producing metallized charge from blast furnace gas ash. Background technique [0002] Blast furnace gas mortar is fine-particle dust carried by blast furnace gas in the ironmaking process. It is composed of blast furnace charge powder and micro-particles produced by violent reaction in the high temperature zone. It is one of the main solid emissions of iron and steel enterprises. The main component of blast furnace gas mortar is iron, and its iron content is generally TFe30-65%, and it also contains certain harmful elements such as Zn, K, and Na. Among them, blast furnace gas mortar contains 7-10% of ZnO. [0003] At present, most domestic treatment of blast furnace gas mortar adopts the rotary hearth furnace process. When the blast furnace gas mortar is disposed of in a rotary hearth furnace, the blast furnace gas...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a production line and process for producing metallized charge from blast furnace gas ash, so as to solve the problem of low zinc oxide grade, metal conversion rate and iron grade in the kiln slag obtained by the existing process, and the zinc oxide content in the kiln slag. Excessively high causes waste of resources

Images