A method for direct reduction of industrial waste slag in rotary hearth furnace

Abstract

The invention relates to a direct reduction method for treating industrial waste slag in a rotary hearth furnace, belonging to a new direct reduction ironmaking process in the metallurgical industry. The main process is: ingredients - mixing - pellets - drying - preheating - reduction - metallized pellets. Metallized pellets with a metallization rate of over 80% can be obtained after reduction in a rotary hearth furnace. The present invention comprehensively recycles and utilizes valuable elements in iron-containing industrial waste residues, economically obtains reducing agent resources, and solves the problem of low falling strength of cold solidified carbon-containing pellets prepared in the process of comprehensive recycling of industrial waste residues It has the advantages of high metallization rate, simple operation, easy control of process conditions, less equipment investment, low production cost, easy to meet raw material conditions, etc., and the overall process is more energy-saving than the furnace smelting process. It is also more environmentally friendly, and more importantly, the method can comprehensively recycle industrial waste, reduce its pollution to the environment, and save energy and protect the environment.

Description

technical field

[0001] The invention relates to a direct reduction treatment method of industrial waste residue. Specifically, carbon-containing pellets are made from discarded iron-containing industrial waste slag and carbonaceous reducing agent, and then reduced in a rotary hearth furnace to obtain metallized pellets. Background technique

[0002] With the rapid development of my country's steel production, the amount of imported iron ore is also increasing year by year. Although the import price of iron ore has soared all the way, 619 million tons of iron ore were still imported in 2010, and the dependence on imported iron ore was as high as 63%. Therefore, it is urgent to broaden the sources of ironmaking raw materials in my country.

[0003] The rapid development of the chemical industry, while promoting the advancement of the national and local social economy, also brings a series of related negative problems. Many domestic enterprises have problems such as extensiv...