(1) Introduction

A large amount of zinc-containing dust is generated during the steel production process, and the general TFe content (mass fraction) is 30%~70%, which also contains a certain content of carbon and harmful elements such as potassium, sodium, and zinc. According to the characteristics of iron-containing dust and mud, various iron-containing dust and mud are mixed in a certain proportion, which can not only make up for the lack of pelletizing performance of single raw materials, improve the strength of the pellets, but also realize the reduction of iron-containing dust and mud pellets in the rotary hearth furnace without adding or adding a small amount of reducing agents and fluxes, making full use of valuable resources such as Fe, C and CaO in the dust and mud, and also make use of potassium, sodium, Harmful elements such as zinc are enriched, and the metallized pellets produced can be used as coolant for converter steelmaking, or added to blast furnaces to reduce coke ratio and CO2 emissions.

(2) Key technologies

① Determination of the chemical composition, phase and mineral phase composition, microstructure and particle size distribution of iron-containing dust and mud, optimization of cold compaction process parameters and composition matching technology;

② High-temperature direct reduction technology of iron-containing dust and mud cold compaction.

(3) Technical and economic effects

Systematic research on the chemical composition, phase and mineral phase composition, particle size distribution, and microstructure of iron-containing dust and mud in iron and steel enterprises, optimization of process parameters for the cold compaction process; determination of direct reduction process parameters with iron dust and mud contained in rotary hearth furnace; The produced metallized pellets can be used as coolant for converter steelmaking, or added to blast furnace to reduce coke ratio and CO2 emissions.