磨矿细度对钛铁矿浮选指标的影响

不同的磨矿细度对钛精矿的浮选指标影响很大,适宜的磨矿细度既能保证有用矿物较完全的单体解离,又不至于造成过粉碎而恶化浮选效果。试验研究证明,对该矿石兼顾精矿品位和回收率两方面的指标,以-0.074 mm为标准进行衡量,其占有率为85%的磨矿细度为最佳入选细度。     

中矿再磨提高某矿山选铜回收率的试验研究

为提高选铜回收率,应用浮选中矿选择性分级再磨新工艺对某铜矿进行了试验研究。研究表明新工艺优化了入选原矿矿浆浓度和细度以及浮选给矿粒度组成,延长了矿物浮选时间,从而有效地提高了铜的回收率。新工艺流程粗精矿铜品位2.01%,回收率达88.48%,比原工艺流程高出2.82个百分点。这说明中矿选择性分级再磨能有效提高该矿的选铜回收率。     

云南某低品位高结合率氧化铜矿选冶联合试验研究

云南某难选铜矿石属低品位高结合率氧化铜矿,采用选冶联合工艺实现了对该铜矿的高效回收.浮选试验研究表明,磨矿细度为-0.074 mm占80%,调整剂水玻璃用量800 g/t,组合捕收剂丁黄药+异戊黄(1∶1)用量240 g/t,铜回收指标最佳,经二粗二精闭路试验获得的铜精矿中铜品位9.17%,回收率17.76%.浮选尾矿经磁选除铁,磁选尾矿采用硫酸浸出,当磨矿细度为-0.045 mm占54%,硫酸用量60 kg/t,液固比3∶1,转速250 r/min,浸出温度45℃,浸出时间2h时,铜浸出率为81.88%,铜的综合回收率达86.55%.     

氧化铜矿浮选工艺

为有效回收氧化铜矿石中的铜矿物,采用硫化-黄药浮选工艺对某氧化铜矿石进行浮选试验研究.考察了磨矿细度、药剂制度等工艺条件,并进行闭路试验.结果表明采用复合调整剂,复合捕收剂,经两次粗选、两次精选、三次扫选,磨矿细度为-0.074 mm 65%的工艺流程,闭路试验获得的铜精矿Cu品位为20.72%,Cu回收率为94.67%;Au、Ag的回收率分别为81.05%、46.67%.     

精确化装补球制度在冬瓜山铜矿的应用研究

针对冬瓜山铜矿磨矿产品细度差,过粗和过粉碎级别产率过高等问题,应用精确化装补球技术对一段球磨机的磨矿介质进行优化,并确定了Φ60∶Φ40∶Φ30=30∶25∶45的磨机初装球方案,实验室研究结果表明,此初装球方案与现场方案相比,磨矿产品细度提高了10.14%,过粗级别(+0.1 mm)降低了10.78%,过粉碎级别(-0.010 mm)降低了1.55%,中间易选级别(0.1~0.010 mm)提高了12.33%,达到了预期效果.     

攀枝花钛精矿浮选新工艺研究

针对攀钢选钛厂现有流程复杂、钛铁矿回收率低等问题,提出了"弱磁除铁—浮选脱硫—钛浮选"的全粒级选别新工艺流程。该工艺流程简单,试验指标理想。小型试验获得了钛精矿(TiO2)品位47.4%,钛回收率45.8%的选矿指标。试验中发现:原矿中的钛磁铁矿、入选细度和矿浆的pH值等因素对浮选指标有较大的影响。     

振动磨粉磨水泥厂选粉机粗粉和矿渣的试验研究

研究了利用振动磨粉磨水泥厂选粉机粗粉和矿渣的粉磨特性,试验结果得出了用振动磨粉磨选粉机粗粉和矿渣的细度下限,粉磨选粉机粗粉和矿渣至水泥产品细度的单位容积产量及新增-80μm单位容积产量。     

辽宁某磁选尾矿回收磷灰石浮选试验

为充分利用矿产资源,对某磁选尾矿进行回收磷灰石浮选试验,通过一次一因素条件试验和正交试验分析研究了磨矿细度、粗选质量分数、药剂用量等因素对浮选的影响.结果表明:对P2O5品位为4.21%的磁选尾矿,磨矿细度-0.074 mm含量为45%时,经一次粗选二次精选,中矿循序返回,可以获得磷精矿P2O5品位36.19%,回收率90.41%的选矿指标.最终的磷精矿达到HG/T 2673-1955《酸法加工磷肥用磷矿》一类专业标准,使磷灰石得到有效的回收利用.     

中低品位硅钙质磷矿石双反浮选的探索试验

贵州某磷矿石P₂O₅ 、SiO₂和MgO质量分数（w）分别为19.12%、24.18%和2.28%,属于中低品位硅钙质磷矿石. 采用胺类捕收剂AY和脂肪酸类捕收剂GJBW对该磷矿石进行浮选,考察磨矿细度和药剂制度对浮选的影响. 初步试验结果表明:采用双反浮选工艺,即粗选脱硅,扫选和精选同时脱硅、脱镁的开路试验流程,获得了P₂O₅含量为26.65%的磷精矿. 但磷精矿中P₂O₅回收率仅为58.27%,有待开展浮选工艺和药剂的优化试验.     

石英──磁铁矿体系选择性磨细研究

用磨矿动力学参数和选择性破裂函数作为石英、磁铁矿有无选择性碎裂现象发生的判据；讨论了配比对它们的磨矿速率、粒级产率和新生比表面的影响．在磨纯矿物时、磁铁矿比石英易磨，磨矿速率相差较大；在磨纳混合物料时，两者之间存在相互干扰，并且这种干扰随磨矿细度的大小不同而不同，导致了磨矿速率差的减小．但粒度特性方程式却不受干扰．     

Mineralogical characterization of a polymetallic sulfide ore to improve silver recovery

Based on the mineralogical characterization for the polymetallic sulfide ore, the way to improve silver recovery was studied. The results showed that silver was the most valuable metal whose grade was 448.82 g/t Ag, while 0.118% Cu, 1.65% Pb and 1.06% Zn may be comprehensively utilizated. The main silver-bearing minerals were argent and aregentite which accounted for 87.18% of total silver. Argentite and other metal minerals were distributed in the gangue minerals in complex forms. Argentite grains of 33.76% minus 50 μm indicated that a fine grinding scheme was necessary to enhance the degree of dissociation, and meanwhile selective grinding must be considered to prevent a complete grinding of coarse grains. The optimum regrinding fineness in the Cu flotation was determined as 73% minus 37 μm, while grains of 68.5% minus 74 μm in one-stage grinding remained unchanged as much as possible. Consequently, silver recovery increased to 2.68%, as well as the content of Pb simultaneously decreased from 7.26% to 2.68% in the Cu concentrate. From the lead pyrometallurgical point of view, recovering larger amounts of silver and lead at the expense of decreasing the grade of lead to a suitable level is not only economically viable for the plant, but also convenient for subsequent processing. Silver and lead recovery increased to 13.18% and 12.58%, respectively, while the Pb grade decreased from 53.1% to 46.12% for the Pb concentrate.     

Flotation technology of refractory low-grade molybdenum ore

Because of the low grade, high oxidation rate and the accumulation of little associated metal sulfide ore in the molybdenum concentrate during flotation, the Qingyang molybdenum ore is difficult to beneficiate. The experimental studies of grinding fineness, the amount of roughing modifier, depressant and collector were completed. In the cleaning process, the contrast experiments of one regrinding, the regrinding and scrubbing, two-stage regrinding was carried. The result shows that the grade of molybdenum ore concentrate is 45.31%, the recovery is 65.98% and the rich ore ratio reaches 20.59% by the regrinding and scrubbing seven cleaning, the regrinding of concentrations from middling of molybdenum-sulfur separation. The regularly-concentrated material from the apparatus was as the middling products. Hence, ideal beneficiation index can be obtained with a rational mineral processing, which offers new beneficiating technology for the refractory low-grade molybdenum ore in China.     

沉积变质型黄梅磷灰岩工艺矿物学研究

利用矿物自动定量分析系统（AMICS）及偏光显微镜对黄梅沉积变质型磷灰岩开展了系统的工艺矿物学研究,并进行了浮选验证试验。研究结果表明:该磷灰岩中主要磷矿物为磷灰石（23.57%）,主要脉石矿物为石英（26.32%）和钾长石（26.51%）,次要的脉石矿物为白云石（12.12%）和方解石（3.68%）;且磷灰石、石英、钾长石的嵌布粒度较粗,只有少量白云石和方解石以浸染的方式嵌布在胶磷矿内部;当矿石粒度度小于0.074 mm占57.71%时,磷灰石、石英和钾长石基本实现单体解离（解离度＞80%）;随后采用一粗一精浮选试验进行验证,发现在该磨矿粒度下,可获得91.84%的浮选回收率,且精矿中P₂O₅品位为35.77%。     

钙硅质胶磷矿浮选工艺研究

针对湖北某中低品位钙硅质胶磷矿,分别进行单一反浮选、双反浮选和常温正反浮选工艺研究及药剂费用对比,结果表明：采用单一反浮选,可得到磷精矿P2O530.37%,MgO 0.36%,回收率88.38%的较好指标,且最为经济,每吨原矿药剂费用仅为15.28元;若希望精矿质量更好些,回收率更高些,建议采用双反浮选,可得到磷精矿P2O531.60%,MgO 0.43%,回收率90.63%的好指标,每吨原矿药剂费用为23.40元;正反浮选相对来说精矿质量一般、回收率较低、药剂费用较高、磨矿细度较细,指标分别为磷精矿P2O530.54%,MgO 0.70%,回收率84.62%,每吨原矿药剂费用为26.98元.     

辽宁凤城含铀硼铁复合矿分选研究

针对辽宁凤城硼铁复合矿资源,在综合测定矿石成分及其目的矿物嵌布特性的基础上开展矿物分选试验研究,采用弱磁场磁选机回收磁铁矿,应用水力旋流器、螺旋溜槽以及摇床等重选设备回收晶质铀矿物,以氧化石蜡皂作为捕收剂、Na2CO3作为矿浆pH值调整剂浮选分离硼矿物．结果表明,当磨矿细度小于0．047mm占99．26％时,铁精矿中TFe品位达到60．27％,回收率为79．21％;重选回收铀矿物效果较好,但是浮选分离指标有待大幅度提高．进一步提高目的矿物单体解离度是改善分选指标的关键．     

Removing iron by magnetic separation from a potash feldspar ore

A new permanent magnetic separator was introduced to treat the ores with the characteristics of weak magnetic iron minerals and in a fine size range. The new machine was applied to the iron removal from potash feldspar. The effects of the magnetic field intensity, pulp density and grinding fineness on the iron removal were investigated. The optimized operation parameters were achieved and listed as follows: the ?0.074 mm content is 85%, the pulp density is 45% and the magnetic field strength is 2T. A close test of middles regrinding was also carried out to improve concentrate yield. The data show that the grade of TFe(total iron) in potash feldspar product decreased from 1.31% to 0.21% and the concentrate yield reached 85.32%. All the results indicated that the traditonal high-intensity electromagnetic separators can be betterly substituted by the new permanent magnetic separator. This study may provide the theoretical evidence for iron removal from potash feldspar.     

胶磷矿不同磨矿细度单体解离度测定及其浮选应用

通过测定胶磷矿在不同磨矿细度下的单体解离度,来计算磷矿的理论最大回收率,进而通过比较实际回收率与理论最大回收率来判定浮选指标的优劣.利用偏光显微镜观测,采用过尺线测法,在磨矿细度-0.076mm含量分别占84.23%、88.71%、92.74%和95.16%的条件下,测定了磷块岩中有用矿物(胶磷矿)和脉石矿物(白云石、石英)的单体解离度.据此计算获得了对应磨矿细度下胶磷矿的理论最大回收率,分别为95.11%、95.71%、96.70%和96.72%.初步浮选试验显示磨矿细度在-0.076mm占88.71%时较为适宜,浮选脱镁率为88.76%,磷精矿实际回收率为87.54%.在此磨矿细度下,通过优化浮选工艺流程及药剂制度,浮选磷精矿实际回收率可达91.24%,精矿中磷酸盐矿物的回收率可达95.33%,说明通过测定胶磷矿的单体解离度来优化指标是可行的.     

云南会泽高镁中低品位胶磷矿单一反浮选

为了降低云南会泽高镁中低品位磷矿的氧化镁的含量,提高五氧化二磷的品位,采用全硫酸一粗一扫的单一反浮选工艺对云南会泽高镁中低品位磷矿进行了试验.在原矿五氧化二磷的品位为23.71％,最佳磨矿细度为-0.074 mm 88.2％的条件下,以硫酸作为pH调整剂和抑制剂（不需要添加磷酸等其他的抑制剂）,以改性的棉籽油脂肪酸皂为捕收剂,进行浮选试验.结果表明：在粗选硫酸用量为10 kg/t,扫选硫酸用量为6 kg/t,捕收剂TSM-2用量分段加药,第一段粗选添加1.2 kg/t,第二段为0.3 kg/t时,获得精矿五氧化二磷品位为30.09％,回收率达到86.53％,氧化锰由原矿的4.55％降至精矿的0.78％,脱镁率为88.13％的较好指标.为云南会泽磷矿的利用开辟了新途径.