MLA技术在某铜钼矿选矿工艺研究中的应用

MLA是目前世界上最先进的工艺矿物学参数自动定量分析测试系统之一。目前国内MLA技术主要用于指导选矿工艺研究,以要进行选矿加工的矿石为研究对象,为选矿流程提供矿物组成、含量、目标矿物嵌布粒度、磨矿产品解离度、伴生元素赋存状态等信息,指导确定选矿工艺,提高选矿试验研究效率。本研究采用MLA技术指导某铜钼矿选矿工艺研究。根据MLA工艺矿物学研究结果确定选矿工艺和药剂制度,通过条件试验确定详细的工艺参数和各药剂用量,最终在原矿铜品位0.63%、钼品位0.022%的条件下,得到铜品位24.82%,铜回收率91.90%,钼品位35.15%,钼回收率57.56%的选别指标。与现场生产指标相比,铜回收率接近,钼回收率提高12%。     

Influences of collector DLZ on chalcopyrite and pyrite flotation

The interaction mechanism of collector DLZ in the flotation process of chalcopyrite and pyrite was investigated through flotation experiments, zeta potential measurements and infrared spectrum analysis. Flotation test results indicate that DLZ is the selective collector of chalcopyrite. Especially, the recovery of chalcopyrite is higher than 90% in neutral and weak alkaline systems, while the recovery of pyrite is less than 10%. When using CaO as pH regulator, at pH=7-11, the floatability of pyrite is depressed and the recovery is less than 5%. Zeta potential analysis shows that the zeta potential of chalcopyrite decreases more obviously than that of pyrite after interaction with DLZ, confirming that collector DLZ shows selectivity to chalcopyrite and pyrite. And FT1R results reveal that the flotation selectivity of collector DLZ is due to chemical absorption onto chalcopyrite surface and only physical absorption onto pyrite surface.     

脂类捕收剂DLZ对黄铜矿和黄铁矿浮选的选择性作用

通过浮选实验、吸附量和红外光谱测定,考察了捕收剂DLZ对黄铜矿和黄铁矿浮选性能的影响及作用机理.结果表明:DLZ在pH=2.7～12.05时对黄铜矿的捕收能力强,最大回收率95.7%,而对黄铁矿的捕收能力弱,且PH=6.9～12.05时其回收率小于10%.用CaO作pH调整剂时,在pH=7～11时黄铜矿的回收率与用NaOH调PH相差不大,但黄铁矿可浮性被抑制,回收率低于5%.DLZ在黄铜矿上的吸附量比在黄铁矿上的大,特别是强碱条件下;其吸附量随用量的增加而增大.DLZ与矿物作用的红外光谱分析表明:黄铜矿与DLZ作用后出现了DLZ的相关特征吸收峰,而黄铁矿与DLZ以及Cu~(2+)作用前后的红外光谱曲线基本没有变化,可见DLZ在黄铜矿表面的吸附属于化学吸附,在黄铁矿表面的吸附属于物理吸附.     

氧化亚铁硫杆菌浸矿体系中黄铁矿的电化学行为(英文)

运用循环伏安、稳态极化扫描和交流阻抗等电化学测试方法,研究黄铁矿在氧化亚铁硫杆菌浸矿体系和无菌酸性体系下的电化学氧化机理。结果表明,在无菌和A.ferrooxidans菌存在的条件下,黄铁矿的氧化反应分为两步:第一步是黄铁矿氧化生成元素S;第二步是元素S被氧化生成SO42-。加入A.ferrooxidans后黄铁矿的氧化机理没有发生改变,但是氧化速度加快。随着黄铁矿与A.ferrooxidans作用时间的延长,极化电流密度增加,黄铁矿表面钝化膜溶解的点蚀电位降低。在细菌存在的条件下,电极的阻抗值下降,表明微生物的存在加速了黄铁矿电极的腐蚀作用,有利于黄铁矿的氧化溶解。     

Bioleaching of pyrite by A. ferrooxidans and L. ferriphilum

Pyrite oxidation rates were examined under various conditions in the presence of A.ferrooxidans and L.ferriphilum,in which different pulp concentration,inoculation amount,external addition of Fe3+ and initial pH value were performed.It is found that A.ferrooxidans and L.ferriphilum show similar behaviors in the bioleaching process.The increasing pulp concentration decreases the leaching rate of iron,and external addition of high concentration Fe3+ is also adverse to leaching pyrite.The increased inoculation amount and high initial pH value are beneficial to leaching pyrite,and these changed conditions bring more obvious effects on leaching pyrite by L.ferriphilum than by A.ferrooxidans.The results also show that adjusting the pH values in leaching process baffles leaching pyrite due to the formed jarosite.Jarosite formed in leaching process was observed using XRD,SEM and energy spectrum analysis,and a considerable amount of debris with a crystalline morphology is present on the surface of pyrite.The results imply that the indirect action is more important for bioleaching pyrite.     

基于磁选预富集的湖北枣阳金红石矿石选矿试验

为高效率、低成本、小污染、高效益地开发利用湖北枣阳金红石矿石资源,根据主要脉石矿物有弱磁性,而金红石无磁性的特点,以高梯度中强磁选预富集工艺为基础进行了金红石选矿试验。结果表明：①在磨矿细度为-0.074 mm占88.60%的情况下,1粗1扫高梯度中强磁选抛尾产率可达29.16%,中强磁选精矿金红石含量为3.07%、回收率为89.50%;②高梯度中强磁选精矿经1粗3精3扫闭路浮选,可获得金红石含量64.53%、回收率为82.21%的金红石浮选精矿;③金红石浮选精矿采用高梯度强磁选-焙烧-酸浸工艺提纯,高梯度强磁选背景磁感应强度为1.2 T,焙烧温度为900 ℃、时间为45 min,盐酸浸出的酸浓度为10%、液固比为1∶5、温度为80 ℃、时间为30 min,最终获得金红石含量为87.88%、回收率为71.21%、TiO2品位为90.12%的金红石精矿。与传统的重选预富集工艺相比,采用磁选工艺可减少细粒金红石损失,提高金红石回收率,为国内金红石资源的高效开发利用提供了一种新思路。     

物联网在教育行业的应用

物联网是由信息系统和物理系统高效融合产生的,是通过传感设备将现实中的各种物件相互连通,由此而形成的网络。每个物件都有特定的标识,便于识别和管理。本文从解释物联网的定义和特征出发,了解物联网的基础架构,从而探讨物联网在教育行业中的应用。     

湖北某铜钼矿浮选试验研究

对湖北某铜钼矿进行了浮选试验研究。通过条件试验确定了丁基黄药和新型捕收剂DY的合适用量, 考察了石灰用量对选别指标的影响。闭路试验结果表明, 以DY为捕收剂时, 可获得精矿铜品位25.50%、钼品位0.60%、铜回收率91.87%、钼回收率72.39%的选别指标; 以丁基黄药为捕收剂时, 可获得精矿铜品位25.12%、钼品位0.42%、铜回收率92.02%、钼回收率51.31%的选别指标。新型捕收剂DY对铜的选别指标与丁基黄药接近, 对钼的选别指标显著优于丁基黄药。     

铜绿山矿提高浮选回收率的工艺改造

为了解决铜绿山铜矿随矿石性质变化,铜回收率逐渐下降的问题,对现场浮选尾矿进行了铜再回收实验室试验研究,据此实施了增设扫选的工艺改造,改造后系统尾矿品位从0.086%降至0.057%,铜回收率从91.79%提高至94.62%,升幅达2.83个百分点,较年初制定的考核目标高出2.32个百分点。每年可增加经济效益730万元以上。     

湖北某高硫铁矿选别试验研究

系统研究了某高硫铁矿降低铁精矿中硫含量的选别工艺。根据降硫工艺的先后顺序, 采用先磁选再降硫和先降硫再磁选两种工艺流程。先磁选后降硫工艺, 采用再磨磁选和浮选两种方法降硫, 再磨磁选降硫工艺得到铁精矿品位67.08%(含硫0.14%), 回收率91.91%; 浮选降硫工艺得到铁精矿品位64.90%(含硫0.13%), 回收率91.90%。先降硫后磁选工艺得到铁精矿品位63.19%(含硫0.13%), 回收率88.43%。推荐先磁选后降硫工艺。