بررسي اثر نوع چسب و دانه بندي سنگ آهن بر خواص مكانيكي و فيزيكي گندله توليدي گل گهر سيرجان

چكيده انگليسي :

100 Investigation of the type of binder and particle size iron ore on the mechanical and physical properties of pellets produced in Sirjan Golgohar Abouzar Moghaddam Pour Khajoee a moghaddam@ma iut ac ir January 12 2015 Department of Materials Engineering Isfahan University of Technology 84156 83111 Iran Degree M Sc Language Farsi Dr Mehdi Ahmadian Assoc Prof supervisor E mail ahmadian@cc iut ac ir Dr Masoud Panjehpour Assoc Prof supervisor E mail panjehpour@cc iut ac irAbstractIn this study the effect of specific surface of magnetite concentrate of Golgohar Mining andIndustrial Company on properties of pellets produced and alternative bentonite binder withcompound boron to reduce bentonite consumption studied To investigate the effect of specificsurface the concentrates with different specific surfaces of 1850 2050 2250 and 2400 cm2 g 0 7 wt bentonite 8 5 wt water and 0 03 wt NaOH was used The optimum specific surface whitinvestigating properties of green and fired pellets was determined By using the concentrate withoptimum specific surface to reduce the consumption of bentonite from different percentages ofboron oxide was used and optimal value of bentonite was determined Colemanite as boron oxide containing compound with different percentages in both state calcined and non calcined withbentonite was used The results showed that with increasing specific surface magnetiteconcentrates green and fired pellets compressive strength increased while the porosity andreducibility of fired pellets decreased Hence specific surface magnetite concentrates with theamount 2050 cm2 g as appropriate specific surface was selected Compressive strength of greenpellets with the increase of the boron oxide increased and then decreased Use of boron oxide major influence on the compressive strength of fired pellets showed so that use of 0 8 percentboron oxide to lead 36 percent increase in compressive strength pellets fired Using 0 4 percentboric oxide increased 11 percent porosity fired pellets and then whit increase the percentage ofboron oxide porosity reduced and reducibility for pellets produced with 0 4 percent boron oxideplus 0 5 percent bentonite obtained more than any other The 0 5 percent bentonite was selected asthe amount optimum The results showed that use of non calcined colemanite caused significantreduction in compressive strength fired pellets and use of colemanite as binder in iron orepelletizing requires calcination colemanite treatment Increase the percentage of calcinedcolemanite without bentonite compressive cold strength increased Also the porosity andreducibility of fired pellets with calcined colemanite was more than pellets are produced withcalcined colemanite plus 0 5 percent bentonite was obtained Properties of green pellets producedwith calcined colemanite achieved less than the minimum amount required Using combination ofcalcined colemanite and bentonite significantly compressive strength of pellets green and firedincreased The obtained results showed that with decrease of the consumption of bentonite from 0 7to 0 5 percent and alternative with 0 25 wt calcined colemanite properties of green and firedpellets improved Keywords Pellet Bentonite Specific surface Boron oxide Colemanite

مقدم پور خواجويي، ابوذر

بررسي اثر نوع چسب و دانه بندي سنگ آهن بر خواص مكانيكي و فيزيكي گندله توليدي گل گهر سيرجان

بنتونيت , سطح وپژه , اكسيد بور , كلمانيت