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1、第3O卷第6期礦冶工程V01.3O№62010年l2月MININGAhIDMETALLURGICALENGINEERINGDeceln~r2010蛇紋石與黃鐵礦間的異相凝聚/分散及其對(duì)浮選的影響①盧毅屏,張明強(qiáng),馮其明,歐樂明,張國(guó)范,龍濤(中南大學(xué)資源加工與生物工程學(xué)院,湖南長(zhǎng)沙410083)摘要:通過浮選試驗(yàn)、濁度測(cè)定、電位測(cè)定和吸附量測(cè)定研究了蛇紋石與黃鐵礦問的異相凝聚/分散及其對(duì)浮選的影響。結(jié)果表明,在pH=7—10.2,蛇紋石與黃鐵礦表面問靜電力表現(xiàn)為引力,顆粒間的異相凝聚嚴(yán)重,且當(dāng)蛇紋石量占黃鐵礦量5%時(shí),就會(huì)顯著降低黃鐵礦回收率。原因是蛇紋石異相凝聚于黃鐵礦表面,不僅自身
2、的可浮性差,還會(huì)降低戊基黃藥在黃鐵礦表面的吸附量。增加捕收劑用量或添加六偏磷酸鈉均能有效改善黃鐵礦的浮選。六偏磷酸鈉可以使蛇紋石表面電位由正轉(zhuǎn)負(fù),有效減弱異相凝聚。關(guān)鍵詞:浮選;蛇紋石;異相凝聚;分散;黃鐵礦中圖分類號(hào):TD923文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):0253—6099(2010)06—0042—04Heterocoagulation/DispersionbetweenSerpentineandPyriteanditsInfluenceonFlotationLUYi—ping,ZHANGMing—qiang,F(xiàn)ENGQi—ruing,OULe—ruing,ZHANGGuo—fan,L
3、ONGTao(SchoolofMineralsProcessingandBio—engineering,CentralSouthUniversity,Changsha410083,Hunan,China)Abstract:Heterocoagulation/dispersionbetweenserpentineandpyriteanditsinfluenceonflotationwerestudiedwithflotationtestsandthedeterminationofturbidity,~'-potentialandadsorptionamount.Theresultssho
4、wthat,forapulppHrangingfrom7to10.2,electrostaticforcebetweenserpentineandpyritecanbecharacterizedasattractive,andheterocoagulationamongparticlesisstrong,andwhentheamountofserpentinereaches5%ofthatofpyrite,therecoveryofpyritecanbesignificantlyreduced.Thismayattributetothecoverageofserpentineonpyr
5、itesurfacebecauseofheterocoagulation,whichmaynotonlyresultinapoorfloatabilityofserpentine,butalsoreducetheadsorptionofamylxanthateonpyritesurface.TheflotationbehaviorofpyriteCaBbeeffectivelyimprovedbyincreasingcollectordosageorbyaddingsodiumhexametaphosphate(SHP),asthesurface~'-potentialofserpen
6、tinecanbetransferredfrompositivetobenegativebySHP,andtheheterocoagulationcanthereforebeefectivelyweakened.Keywords:flotation;serpentine;heterocoagulation;dispersion;pyrite在硫化銅鎳礦的浮選中,蛇紋石是主要的脈石礦硫化銅鎳礦的浮選中,針對(duì)蛇紋石常用的處理方物,其含量較多、易泥化、嚴(yán)重地干擾含鎳礦物的浮法有酸法浮選與添加蛇紋石抑制劑等。酸法工藝的確選¨I4J。對(duì)于鎳精礦來說,降低冶煉能耗,首先必須降能活化鎳黃鐵礦浮選,降
7、低精礦中氧化鎂的含量,并可低鎳精礦中MgO含量。鎳精礦中MgO含量過高,使大大提高銅的回收率,但酸法浮選酸耗很大,造成設(shè)備冶煉爐溫升高,成本增加,爐渣粘度增大,使冶煉回收的腐蝕,難以在生產(chǎn)實(shí)踐中應(yīng)用J。常用的蛇紋石抑率降低;采用閃速爐時(shí),因爐渣相粘度過大而導(dǎo)致閃制劑有CMC、六偏磷酸鈉、水玻璃、古爾膠卜m等。它速爐結(jié)瘤,局部腐蝕爐體產(chǎn)生漏爐。因此,鎳礦山一直們?cè)诟∵x中起抑制作用,改善硫化銅鎳礦的浮選。Ed—把降低鎳精礦中MgO含量作為攻關(guān)目標(biāo)。