金属矿山
金屬礦山
금속광산
Metal Mine
2015年
10期
95-99
,共5页
陈婉琦%张芹%王天正%戴柯进
陳婉琦%張芹%王天正%戴柯進
진완기%장근%왕천정%대가진
细粒赤铁矿%絮凝剂%沉降速率
細粒赤鐵礦%絮凝劑%沉降速率
세립적철광%서응제%침강속솔
Ultrafine hematite%Flocculants%Sedimentation rate
为改善细粒赤铁矿精矿在浓缩脱水过程中存在的沉降时间长、过滤速率低、穿漏现象严重、滤饼含水率高等问题,以巴西某赤铁矿精矿为研究对象,考察了絮凝剂种类及用量、矿浆pH、温度及混匀程度等对赤铁矿沉降行为的影响. 结果表明:絮凝剂添加量对赤铁矿精矿沉降效果有显著影响,用量过低时,对改善沉降效果不明显,用量过高时会产生"胶体保护",沉降速率不再随絮凝剂用量增加而提高;聚丙烯酸钠类絮凝剂在酸性条件下对精矿的沉降效果好,聚丙烯酰胺类在碱性条件下沉降效果较好;温度较低时,不利于絮凝剂与矿物颗粒作用,沉降效果差,温度过高时,絮凝剂发生降解,沉降效果变差;翻转混匀次数少时絮凝剂分子分散不好,精矿沉降速率低,在充分混合时,细粒赤铁矿沉降速率达到最大值,进一步增加翻转混匀次数,会造成絮团断裂,精矿沉降速率降低. 试验结果对赤铁矿精矿沉降时选取合适的絮凝剂,提高精矿沉降效果具有重要意义.
為改善細粒赤鐵礦精礦在濃縮脫水過程中存在的沉降時間長、過濾速率低、穿漏現象嚴重、濾餅含水率高等問題,以巴西某赤鐵礦精礦為研究對象,攷察瞭絮凝劑種類及用量、礦漿pH、溫度及混勻程度等對赤鐵礦沉降行為的影響. 結果錶明:絮凝劑添加量對赤鐵礦精礦沉降效果有顯著影響,用量過低時,對改善沉降效果不明顯,用量過高時會產生"膠體保護",沉降速率不再隨絮凝劑用量增加而提高;聚丙烯痠鈉類絮凝劑在痠性條件下對精礦的沉降效果好,聚丙烯酰胺類在堿性條件下沉降效果較好;溫度較低時,不利于絮凝劑與礦物顆粒作用,沉降效果差,溫度過高時,絮凝劑髮生降解,沉降效果變差;翻轉混勻次數少時絮凝劑分子分散不好,精礦沉降速率低,在充分混閤時,細粒赤鐵礦沉降速率達到最大值,進一步增加翻轉混勻次數,會造成絮糰斷裂,精礦沉降速率降低. 試驗結果對赤鐵礦精礦沉降時選取閤適的絮凝劑,提高精礦沉降效果具有重要意義.
위개선세립적철광정광재농축탈수과정중존재적침강시간장、과려속솔저、천루현상엄중、려병함수솔고등문제,이파서모적철광정광위연구대상,고찰료서응제충류급용량、광장pH、온도급혼균정도등대적철광침강행위적영향. 결과표명:서응제첨가량대적철광정광침강효과유현저영향,용량과저시,대개선침강효과불명현,용량과고시회산생"효체보호",침강속솔불재수서응제용량증가이제고;취병희산납류서응제재산성조건하대정광적침강효과호,취병희선알류재감성조건하침강효과교호;온도교저시,불리우서응제여광물과립작용,침강효과차,온도과고시,서응제발생강해,침강효과변차;번전혼균차수소시서응제분자분산불호,정광침강속솔저,재충분혼합시,세립적철광침강속솔체도최대치,진일보증가번전혼균차수,회조성서단단렬,정광침강속솔강저. 시험결과대적철광정광침강시선취합괄적서응제,제고정광침강효과구유중요의의.
In order to improve the problems of long settling time,low filtration rate,severe wear leakage phenomenon,low content in filter cake during thickening and dehydration for fine grained hematite concentrate. Effects of types and dosage of flocculants,slurry pH,temperature,and degree of mixedness on the sedimentation behavior were studied,using an iron concen-trate from Brazil as research object. The results indicated that:there were significant influence on sedimentation of hematite concentrate by adjusting flocculants addition,for too low addition have no obvious improvement on the sedimentation rate,with excessive addition could initiate colloid protecting,and the sedimentation velocity will not increase with dosage increase of floc-culants. Sodium polyacrylate flocculants have good settling performance in alkaline conditions,while polyacrylamide flocculants have good settling performance in acidic condition. Hypothermia have disadvantage in improving the sedimentation rate,hyper-thermia would lead to degradation of flocculants. Sufficient reversal and mixing was conducive to sedimentation,excessive mix-ing will worsen sedimentation effects. The results have important implications for suitable flocculant selection in iron concen-trate settling and improve the concentrate sedimentation.