Influence Of Iron Ore Powder Content On The Starting Temperature Of Gasification Reaction Of The Carbon Iron Composite

As we all know,when we are approaching the industrialization,the excess CO2 emissions will aggravate the environmental destruction and there is 15 percent of these CO2 from the steel industry,especially from the blast furnace iron making.The faster expanding production of the steel industry makes the environmental destruction more serious.What's worse,the distribution of the coking coal in our country is uneven and relatively insufficiency.The coking coal and iron ore are rising all the time.All of these make the steel industry become uncompetitive increasingly.Meanwhile,in the November in 2011,a production line in Japan has been set up in the JFE steel company and conducted the half-industrial tests in the furnace.It built by the project,"A new iron making technology to enhance the adaptability of resources and decrease the environmental loads",which is funded by the environmental ministry and the ministry of economy and environment in Japan.The line can produce 30 tons of steels per day with the poor-quality coal and iron ore.According to the prediction of the researchers,instead of the metallurgical coke,the CIC will reduce 10 percent of the energy wasted and CO2 emissions.It will not only improve the competitiveness by using low-quality materials in the blast furnace,but also offers the right direction for iron making in the blast furnace to cut down the CO2 emissions,extend the use of raw material and raise its competitiveness.In our country,there is a few researches on this field currently.In order to improve the resource condition,this study chose the non-coking coal in Shenfu and low-grade(around 57 percent)Iron Ore as the main resource,the pitch as binder,and got the Carbon Iron Composite(CIC)samples with different content of IOP finally after crushing,sieving,mixing,pressing and coking.The universal testing machine was used to test the compressive strength of CIC.The X-radial diffractometer and SEM were used to analyze briquette and the microstructure of CIC.Besides,the differential thermal analyzer was used to measure the DTA curves of CIC gasification reaction.All the data is intended to analyze the reaction mechanism and the impact of different iron ore powder(IOP)on the starting temperature of the gasification reaction of Shenfu CIC gasification reaction.The aim of this paper is to offer the basic data for cutting down the CO2 emissions,extending the use of raw materials and raising its competitiveness.These data shows:(1)The compressive strength of Shenfu CIC will rise with the increasing percentage of the iron ore powder contained.The Peak could reach 2.39MPa.(2)After pressing and coking,the CIC will transform into a porous mixture of carbon,iron,ferric oxide and iron oxide;some of iron(white grains about 0.05?lum)will fill into the holes of the mixture while CIC is pressing and coking.Some of them will gather together and binder with coal.(3)While it is pressing and coking,the CIC will reduce most of iron oxide and increase the metal in the blast furnace.(4)With the increase of IOP,the iron atoms obtained by reduction increase.This is due to the photocatalytic of the iron,he starting temperature of the gasification reaction will drop from 884.7? to 803.2? and the activation energy will decrease from 192.35 kJ mol'1 to 177.30 kJ·mol-1 when CIC vaporizes.(5)The results demonstrate that if some of the CIC were added into the furnace,within the area between 500? to 900?,the balance of CO/CO2 in the raw coal flow would be broken down.There would be more endothermic reaction and the concentration in the banded area in the furnace would become low.If there is 38.2%of iron ore powder in CIC,the concentration will decrease about 11.2%.