磁化焙烧选别细粒难选赤铁矿尾矿试验研究

采用物理方法回收细粒难选赤铁矿尾矿,金属回收率不高,为实现铁尾矿资源的高效利用,采用预富集—焙烧工艺对细粒难选赤铁矿尾矿进行选别试验,试验主要包括:尾矿的预富集试验、预富集精矿磁化焙烧试验、焙烧产品再磨再选试验。试验矿样在给矿TFe品位为15.68%的条件下,预富集试验得到了精矿TFe品位33.19%、回收率60.45%的技术指标。预富集精矿焙烧后经单一磁选工艺选别可获得TFe品位63.04%、作业回收率80.04%、总铁回收率48.40%的技术指标;经磁浮联合分选获得了精矿TFe品位65.10%、作业回收率72.16%、总铁回收率43.62%的技术指标。     

长治贫瘦煤生产气化型煤试验研究

以长治慈林山矿的贫煤和当地贫瘦煤为原料，采用2种免烘干型和一种烘干型型煤粘结剂，在试验室开发出了具有冷热强度高、防水性能好、其它质量指标满足气化用煤要求的气化型煤。已进行了300t级工业化试生产，有待于进行工业气化试验进行验证。     

Selective separation and recovery of iron and tin from high calcium type tin- and iron-bearing tailings using magnetizing roasting followed by magnetic separation

In this study, a process of magnetizing roasting followed by magnetic separation, which is used to separate or recover tin and iron from the high calcium type tin- and iron-bearing tailings (containing 35.53 wt.% Fe and 0.56 wt.% Sn), was investigated . A magnetic concentrate containing 66.3 wt.% Fe and 0.07 wt.% Sn with an iron recovery rate of 92.9 wt.% was obtained under optimal conditions: anthracite ratio of 2.5:100, roasting temperature of 850°C, roasting time of 30 min, grinding time of 10 min, and magnetic field intensity of 0.1 T. In addition, the effect of roasting parameters on the separation of iron and tin and phase transformation of SnO₂ was investigated by using X-ray powder diffraction, Scanning Electron Microscopy–Energy Dispersive Spectroscopy, etc.     

提高硫酸尾渣磁选铁精粉品位的方法

介绍硫酸尾渣磁选制取铁精粉的不同生产工艺;瑞和化肥有限公司13万t/a硫铁矿制酸装置,利用其尾渣的矿尘生产铁精粉的工艺流程及提高铁精粉品位及产率的措施,使铁精粉产量从200t/d提高到300t/d,w(Fe)从53%提高到58%,w(S)从0.9%降到0.3%,获得较好的经济效益.     

硫酸渣磁重选联合工艺回收铁精矿研究

研究了从硫酸渣中回收铁精矿的工艺流程.硫酸渣分选最佳工艺流程为:预先分级、磨矿后在120kA/m条件下磁选,磁选尾矿用螺旋溜槽重选,混合精矿的品位61.32%,回收率83.28%,产率72.86%.硫酸渣不经磨矿直接磁选得不到高品位精矿,全部磨矿后分选,精矿品位略有提高,但回收率下降较多.     

Separation of Phosphorus and Magnetic Mineral Fines from Siderite Reductive Ore by Applying Magnetic Flocculation

The characteristics of siderite reductive ore and the ultrafine grinding-magnetic flocculation separation (MFS) of this ore were investigated in the present work. The results indicated that the iron phase in the raw ore was predominantly metallic iron with an iron particle size below 30 μm, and the phosphorus compound was apatite. By applying MFS to siderite reductive ore containing 37.14% Fe and 0.52 P, a concentrate assaying 66.37% Fe and 0.19 P with 74.32% recovery was produced. The iron recovery increased by 5.77% compared with the results of the conventional magnetic separation. The high efficiency in phosphorus removal and iron recovery achieved by the MFS process may be attributed to the adequate liberation of iron particles and the increase in magnetic force on the iron mineral fines in the form of flocs in a magnetic field.     

Beneficiation of micro-fine magnetic minerals from reductive iron ore with ultrafine grinding-magnetic flocculation separation

Beneficiation of micro-fine magnetic minerals from reductive iron ore was investigated. Sample characteristics and main force analysis of magnetic floc were conducted. The results indicated that the iron phase in reductive iron ores was predominantly metallic iron (below 20 μm). By applying ultrafine grinding-magnetic flocculation separation (MFS) to the raw ore (29.85% Fe), a concentrate assaying 74.12% Fe with 81.45% iron recovery was obtained. The iron recovery increased by 6.68% compared with the conventional magnetic separation (CMS). The high efficiency in beneficiation may be attributed to an increase in magnetic force on the micro-fine iron minerals in the form of flocs.     

基于强磁预选的某氰化尾渣磁化焙烧-磁选工艺

以TFe品位为30.71%的河南某焙烧氰化尾渣为原料,采用湿式强磁预选?磁化焙烧?磁选联合工艺制备铁精粉. 结果表明,当强磁预选的磁场强度为1511.54 kA/m时,得到TFe品位44.96%、回收率78.27%的粗精矿;以该粗精矿为磁化焙烧原料,配10wt%焦粉,于750℃下磁化焙烧45 min,焙烧样经二段磨矿、二段弱磁选,当二段磨矿细度小于0.028 mm占63.9%时,可得TFe品位61.71%、回收率68.66%的铁精粉;产率为16.79%的弱磁选尾矿不含氰化物,转化为一般工业固体废物. 焙烧温度低于700℃时,部分赤铁矿未还原;焙烧温度超过800℃时,生成的磁铁矿转化成镁铁矿、铁橄榄石和方铁矿,磁铁矿含量降低,导致铁损失;焙烧温度为750℃时,磁铁矿含量最高.     

云南某高硫铅锌矿流程优化试验研究

针对云南某铅锌选矿厂产出的硫精矿中铅锌品位高、铅精矿中铅品位低的问题,考查了目的矿物的解离情况,通过铅硫混合粗精矿再磨提高了目的矿物的单体解离度,优化了工艺流程。试验结果表明:在磨矿细度为-325目质量分数占70%时,采用铅硫混合粗精矿再磨、脱锌扫选尾矿返至锌作业的工艺流程,可得到铅品位为61.23%、铅回收率为85.68%的铅精矿,锌品位为49.65%、锌回收率为93.38%的锌精矿;与不再磨流程相比,铅精矿中铅的品位提高了2.05个百分点,回收率提高了1.75个百分点,锌精矿中锌的回收率提高了2.28个百分点,同时铅精矿中锌品位及硫精矿中铅、锌品位均有所降低。     

采用正交实验法对某型煤优化配比研究

针对吉林市某型煤产品存在的问题，应用正交实验法对其原料配方、各种原料煤对型煤热值影响的主次顺序，挥发物产率和燃尽率等影响燃烧特性的因素进行了实验研究，分析了实验各因素对燃烧过程的影响；得出了所配型煤着火燃尽特性的变化规律及其关联式，并绘制了相关的实验曲线；提出了改进型煤燃烧过程主要措施，即保证炉膛高温和延长型煤在炉内的停留时间。     

云浮硫铁矿烧渣选矿试验

对云浮硫铁矿烧渣磨矿－弱磁选－阴离子反浮选试验流程、设备、工艺条件和试验结果作了介绍。在磨矿细度－２００目８８．４８％、原烧渣含铁品位４５．８７％的条件下，经磁－浮流程分选，获得综合铁精矿品位５５．４４％，回收率７７．９１％的指标。综合的尾矿品位含铁２８．５０％．     

陕北洁净型煤的煤岩配煤方法研究

为了合理利用陕北当地煤炭资源生产优质型煤,通过煤岩配煤方法,将实验煤样的镜质组反射率分布通过方程转换成类强度指数PSI集合,以标准型煤的PSI为目标求解参配煤的比例,采用MATLAB进行多元线性规划的矩阵计算。利用解多元线性规划的限制条件(归一化、加入煤泥、某个特定的原料含量等)可使所配的洁净型煤满足指标要求。结果表明:在特定的标准下,有的待配煤不适合参与配煤,需要剔除;按归一化原则得到的合成型煤与标准型煤的煤岩指标吻合度较无归一化原则时高;该方法可以实现在指定某种原料及含量时配煤;配煤计算完成后,还可以检验可加和的指标是否满足工业指标要求。     

新型洁净型煤的工业燃烧及对大气环境质量的影响

在型煤工业生产线上生产了２００ｔ新型洁净工业型煤，并在工业链条炉上进行了原煤和型煤的对比燃烧试验。结果表明：燃烧新型洁净型煤较燃烧原煤可以降低ＳＯ２和ＴＳＰ的排放，提高锅炉热效率，同时对排放的可吸入尘的分析可吉，燃烧型煤可降低烟尘中有机碳和无机碳的排放量，改善大气环境质量。     

Beneficiation of Cassiterite and Iron Minerals From a Tin Tailing with Magnetizing Roasting-Magnetic Separation Process

The beneficiation of cassiterite and iron minerals from tin tailings with magnetizing roasting and low-intensity magnetic separation (MR-LMS) process was studied in this work. It showed that the process was effective in recovering the tin and iron values from the refractory ore, produced a high-quality iron concentrate assaying 64.68% Fe with the recovery of 87.47% and a tin-rich middling assaying 4.10% Sn with the tin recovery of 63.55%, from the tin tailing assaying 0.20% Sn and 14.56% Fe. It has been found that the key point of the process was the step of magnetizing roasting, which converted hematite and limonite into magnetite. The separation efficiency of the process closely correlated with roasting temperature, roasting time, lignite addition, and the liberation of cassiterite with the iron minerals.     

用湿式弱磁选选矿方法回收钢渣中铁的试验研究

文章以莱钢钢渣为原料,进行了湿式弱磁选回收铁的工艺试验研究和湿式磁选磨矿细度试验,所生产的铁精矿产率为31.08%,选矿比3.25,品位为61.30%,全铁回收率为68.21%。     

干化污泥型煤抗压强度的实验研究

利用微波干燥脱水污泥制备型煤粘结剂,与粉煤混合压制成型煤。通过正交试验考察成型压力、干化污泥含水率及添加比例对型煤抗压强度的影响。结果表明：微波干化的污泥型煤较粘土型煤的抗压强度大;成型压力、干化污泥含水率及添加比例均为型煤抗压强度的显著因素,各因素优化范围：成型压力为25～30MPa,干化污泥水分为40％左右,干化污泥添加比例为20％～30％。     

不锈钢粉尘磁选-还原实验研究

在分析不锈钢电弧炉冶炼粉尘物化性质的基础上,探索了磁选-还原工艺降低不锈钢粉尘中Ca, Mg, O等杂质含量的可能性. 结果表明,采用磁选-还原-磁选工艺处理不锈钢粉尘,磁性物质产率为37.39%,TFe品位达53.66%,主要杂质CaO和MgO总量为11.61%,添加一定量Fe粉和Cu粉后可作为铁基粉末冶金摩擦材料的原料. 综合考虑磁性物质产率、TFe品位和脱钙效果,合适的磁场强度范围为60~90 mT.     

Separation and recovery of iron from a low-grade carbonate-bearing iron ore using magnetizing roasting followed by magnetic separation

In this study, a process of magnetizing roasting followed by low-intensity magnetic separation (MR-LMS), which is used to separate and recover iron from a low-grade carbonate-bearing iron ore (containing 34.6 wt.% Fe), was investigated. A magnetic concentrate containing 65.4 wt.% Fe with an iron recovery rate of 92.6 wt.% was obtained under optimal conditions: roasting temperature of 800°C, roasting time of 8 min, bitumite ratio of 10:100, grinding fineness of around 85 wt.% passing 38 µm, and magnetic intensity of 0.12 T. In addition, the phase transformation and magnetic properties were analyzed by X-ray diffraction (XRD) and vibrating sample magnetometry (VSM) to reveal the mechanism.     

菱铁矿磁化焙烧与磁选分离制备铁精矿

对国内某地菱铁矿进行无还原剂全粒级磁化焙烧-磁选研究. 结果表明,菱铁矿在无还原剂条件下于800℃焙烧15 min,所得焙烧矿在磨矿粒度小于0.074 mm占90%、磁场强度0.10 T条件下磁选,得到铁品位63.15%、铁回收率92.52%的铁精矿. 磁选精矿中的锰、镁和部分钙与铁元素以类质同像共存.     

硫铁矿烧渣富铁除硫研究

利用硫酸厂生产SO2后硫铁矿残渣,用水洗溶解可溶性物质、磁选、球磨法富集铁,化学浸泡去除铁精矿中的硫,浓碱法浮选法去除二氧化硅等。经磁选、浮选等方法处理后,烧渣的含铁质量分数由42.4%提高到63.58%;含硫量由1.37%下降到0.12%。产品可用作炼生铁三级品原料。