Experiment Research Of Utilization Of Iron Tailings Synthesize Forsterite Refractory With Secondary Sintering Method

Along with the mining of the iron ore resources,the iron tailings massively piled up not only has created the land resource waste,but also has brought lots questions about environmental pollution and ecological equilibrium destruction.Therefore,carting out the iron tailings resources comprehensive utilization,develops the high attachment value product with the iron tailings,has the extremely vital economical significance and the social significance.This paper is examining the research which is to prepare the forsterite refractory by using the iron ore tailings and active magnesia,through the research of the mixture ratio of raw material,technical process and performance,result as follows:(1)Through the alculation of the forsterite chemical formula and the analysis of the constitutional diagram,we find that the experiment mixture ratio of raw material in weight is 60%active magnesia and 40%iron tailings.(2)The secondary sintering process has been decided,and the proper secondary sinter temperature is 1600℃.(3)The analytical methods including XRD,SEM,EDAX and so on, which shows that the host lattice of the sample is forsterite,and has a little periclasite and magnesia alumina spinel.(4)Obtains through the performance examination:the hot modulus of rupture of the brick is 5.15MPa,the efractoriness is over 1700℃,and excellent properties in resisting calcined soda.The thermal shock resistance is once in forced-air cooling,the Refractoriness under load 1453℃,and the properties in resisting Glauber's salt has the dehiscence phenomenon.From the above mentioned,the thermal shock resistance of the sample is bad,therefore consideration in added 5%Al₂O₃ powder in the secondary mixing process,to improves its thermal shock resistance,to this sample A performance examination result is:The principal constituent is forsterite,and has a little magnesia alumina spinel and Mg-Fe liquid phase.The thermal shock resistance is three tines in forced-air cooling,the Refractoriness under load 1543℃,and the properties in resisting Glauber's salt has not the dehiscence phenomenon.Obtains through the comparison,sample A's each performance will have the improvement,but is opposite to the high quality forsterite product performance,also has the certain disparity,if it to apply to the middle checker-work in the middle section of glass kilns,also waits for further studies.