粘结剂对某高铁尾矿含碳球团强度的影响.pdf

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1、第33卷第6期矿冶工程V01．33№62013年12月MININGANDMETALLURGICALENGINEERINGDeeember2013粘结剂对某高铁尾矿含碳球团强度的影响①刘真真，孙体昌，余文，高恩霞，徐承焱，刘志国(北京科技大学金属矿山高效开采与安全教育部重点实验室，北京100083)摘要：CMC、糖浆、淀粉、膨润土、水玻璃、标准水泥等单一及复合粘结剂对某高铁尾矿压球球团强度的影响。结果表明，CMC、膨润土为粘结剂时生球效果较佳，落下次数大于4次，湿球抗压大于40N，干球抗压大于18

2、0N；糖浆作为粘结剂时能显著提高球团干球强度，其落下次数大于20次，抗压强度达到730N；高温强度试验表明，球团强度在焙烧初期急速下降，焙烧后期随着烧结现象的发生和金属铁的生成，球团强度逐渐增强；球团孔隙率测定试验表明，在焙烧初期球团孔隙率迅速增大，在焙烧5min时达到最大，超过50％；最终确定0．4％CMC和8％膨润土为该矿的最佳粘结剂配比组合，在此条件上压球，并将球团矿直接还原磁选，可得到全铁品位95．64％，回收率88．42％的直接还原铁。关键词：含碳球团；粘结剂；高温强度；孔隙率；还原铁

3、中图分类号：TF046文献标识码：Adoi：10．3969／j．issn．0253-6099．2013．06．022文章编号：0253-6099(2013)06-0084—04ImpactofBinderonStrengthofCarbon-containingPelletofHigh—ironTailingsLIUZhen—zhen，SUNTi—chang，YUWen，GAOEn—xia，XUCheng·yan，LIUZhi—guo(StateKeyLaboratoryofHighEffici

4、entMiningandSafetyofMetalMinesofMinistryofEducation，UniversityofScienceandTechnologyBeqing，Beo'ing100083，China)Abstract：TheimpactofsingleandmixedbinderofCMC，molasses，starch，bentonite，sodiumsilicateandstandardcementonthestrengthofpressedpelletsofhigh—

5、irontailingswasstudied．ResultsshowthatCMCorbentoniteusedasthebinderresultedingreenpelletswithmorethan4timesofdropping，wetcompressivestrengthgreaterthan40N，drycompressivestrengthgreaterthan180N；whilemolassesusedasthebindercanremarkablyincreasethestren

6、gthofdrypelletswithmorethan20timesofdroppingandcompressivestrengthupto730N．Ahigh-temperaturestrengthtestshowedthatthecompressivestrengthofpelletsdroppedsharplyatthebeginningofroasting，butgraduallyincreasedwiththeoccurrenceofsinteringandmetallicironge

7、neration．Resultsofpelletporositydeterminationtestsshowedthatpelletporosityalsoincreasedquicklyatthebeginningofroasting．maximallyover50％afterbeingroastedfor5min．ItwasfinallydeterminedthatthemixtureofCMC(themassfractionof0．4％)andbentonite(themassfracti

8、onof8％)isusedasanoptimalbindercombination．Afterbeingpressedundersuchcondition，pelletwassubjectedtotheprocessofdirectreduction—magneticseparation，leadingtothedirectreducediron(Dm)withaTFegradeof95-4％andrecoveryof88．42％．Keywords：carbon—containingpellet