Study On The Reduction Of Carbon-bearing Pellet Of RHF Treatment

Containing pellets by rotary hearth furnace process can be used to process iron ore(powder),can also be used to handle dust containing iron metallurgical enterprises,particularly iron and steel enterprises iron-bearing dust containing zinc have distinct advantages.Turned end of furnace processing containing carbon ball mission process of key is solid carbon restore iron oxide,due to processing raw materials of different,containing iron raw materials in the of iron oxide of exists way also different,restore dynamics and mechanism also different,papers for three species turned end of furnace containing carbon ball mission process processing of material(that iron fine mine,and containing zinc steel dust and the copper slag)carried out theory and experiment research,discussion different restore material in turned end of furnace in the of restore mechanism,for turned end of furnace processing different containing iron raw materials of restore process parameter of developed provides theory.First according to different materials containing carbon reduction process is a thermodynamic analysis,thermodynamic calculations showed that: direct reduction of phase c Fe2SiO4,starting temperature for 807 ?,higher than FeO starting temperature 100 ?,when restoring the Fe2SiO4,CO concentration in the gas phase is greater than 86%,to restore Fe2SiO4 to Fe;Zinc-bearing dust phase reduction of Zn O in c when restoring directly,when after the temperature more than 880?,CO concentration of the carbon gasification reaction over ZnO to restore the required concentration,ZnO convert direct reduction with carbon gasification reaction of the indirect restoration.Iron ore,zinciron and steel dust and slag containing iron phase composition for ferric oxide,ferrous oxide and fayalite,this article on chemically pure Fe2O3,FeO,Fe2SiO4 thermogravimetric experiment of solid carbon reduction,explores three types of pure substance reduction control mechanism for subsequent iron ore,zinc-steel dust provides the basis and kinetics of copper slag.According to turned end of furnace process of features,using laboratory high temperature furnace on turned end of furnace process for has hot state simulation experiment research,through orthogonal experiment,research has different process parameter(that: temperature,and C/O than,and restore agent,factors)on containing carbon ball mission restore of effect,results showed that: restore agent type on copper slag containing carbon ball mission of restore effect maximum,restore temperature on iron fine mine and containing zinc steel dust containing carbon ball mission of restore effect maximum,in same conditions Xia,different material containing carbon ball mission of terminated restore degrees respectively is,Iron ore slag steel dust containing zinc 70.1%,54.1%,49.4%,accordingly to determine copper slag reduction difficult,followed by dust containing zinc,iron and steel,the reduction of iron ore concentrate hard minimum.In part of the dynamics,succession model,temperature reduction,calculated iron concentrate and dust containing zinc steel pellets containing carbon reducing the activation energy of the reaction is 179.8 kJ/mol,respectively KJ/mol and 261.3 kJ/mol,reduction of speed sessions for the gasification of carbon;Copper slag activation energy for carbon-bearing pellet reduction 373.6 kJ/mol,for reduction of speed control link interface or a local chemical reaction.This article discusses the typical restore process of the raw material,involved in iron concentrate of coal-based direct reduction of dust recycling,metallurgy and other metallurgical raw materials processing and so on,through comparative analysis,deepening the rotary hearth furnace pellet containing carbon reduction of basic research,as well as a guidance on the practical application.