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1.
腾冲高泥氧化锌矿选矿实验研究   总被引:1,自引:0,他引:1  
针对腾冲某氧化锌矿嵌布粒度细、含泥量高的技术难题进行了选矿实验研究. 结果表明,该矿中锌品位为6.65%、铁品位为12.31%,锌氧化率达92.83%,锌主要以异极矿形式存在,铁主要以磁铁矿形式存在. 经多个实验流程对比分析,采用预先洗矿(洗去小于37 mm粒级的颗粒)、沉砂磨矿后先磁选后浮选的流程,确定最佳磨矿细度为小于75 mm的颗粒达91.74%,弱磁选电流为4 A,粗选药剂用量为碳酸钠2 kg/t、六偏磷酸钠2 kg/t、硫化钠13 kg/t、KPR 2 kg/t. 采用闭路选矿流程,得到锌品位为27.89%、回收率75.26%的氧化锌精矿和铁品位为61.25%、回收率51.65%的铁精矿. 通过Zeta电位分析捕收剂KPR与异极矿的作用机理.  相似文献   

2.
采用直接还原?磁选工艺从湖南某地高磷铁矿含碳团块中提铁,研究了还原温度、还原时间、团块碱度、还原剂焦粉用量、添加剂Na2SO4用量和废塑料替代焦粉量等因素对磁选精矿指标的影响. 结果表明,在还原温度1150℃、还原时间40 min、团块碱度0.8、碳氧摩尔比0.9的条件下,添加4% Na2SO4同时添加废塑料替代25%焦粉,可得到金属化率为88.77%的焙烧矿,磁选后可得到铁品位91.99%、金属化率92.26%及P含量0.20%的金属铁粉,铁回收率达86.74%.  相似文献   

3.
《云南化工》2015,(1):6-11
云南某铁矿磁选后的含磷尾矿中,P2O5品位为17.95%,主要经济矿物为氟磷灰石和少量胶磷矿,脉石矿物主要为铝直闪石、角闪石、黑云母、赤铁矿、方解石、白云石、石英、长石和白云母。运用自动矿物分析仪的工艺矿物学参数自动定量分析测试系统,解决了传统的工艺矿物学难以准确测定矿物粒度及单体解离度的问题,为选矿工艺流程的确定提供了理论依据,具有一定的参考和指导意义。  相似文献   

4.
针对宜章同高铅锌矿尾矿的回收利用的研究,论文进行了尾矿储量、尾矿库废水性质、尾矿化学成分分析、尾矿中银矿物的物相分析、尾矿浮选探索试验、二次尾矿重选铅的试验、技术路线研究和流程综合设计的研究工作,最后达到铅锌尾矿最终选矿目标。  相似文献   

5.
刘属兴  邹国文  余娆 《陶瓷学报》2011,32(2):269-272
通过对铌钽矿尾砂的化学分析、矿物分析、粒度分析研究,加入铌钽矿尾砂、玻璃粉、方解石、氧化钛、氧化锌、长石等原料,研制出硅酸锌为主要晶体的结晶釉。其烧成温度1230℃,析晶温度1130℃,保温时间100分钟。实验结果表明,晶花的析出及大小与配方组成、烧成制度、冷却制度、磨时间、釉层厚度等因素影响明显。  相似文献   

6.
《分离科学与技术》2012,47(9):1426-1432
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.  相似文献   

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9.
选钼尾矿中提取陶瓷掺料试验研究   总被引:1,自引:0,他引:1  
选钼尾矿经弱磁选回收磁铁矿、浮选回收金云母、黄铁矿,采用球磨、脱泥浮选工艺,以硫化钠为硫化剂、水玻璃为抑制剂、BK301为捕收剂、SK9011为起泡剂,通过浮选方法一次脱除微量蓝铜矿、辉钼矿杂质;通过湿法强磁选,在13000 Gs磁场强度下采用“一次粗选,三次扫选”磁选工艺可得钠长石-透辉石-方解石-石英系列陶瓷掺料,该试验结果为中试试验提供的技术参考,有利于实现选钼尾矿资源综合利用.  相似文献   

10.
东阳市钾长石矿干法磁选除铁研究   总被引:1,自引:0,他引:1  
分析了东阳市钾长石矿中铁的赋存状态和嵌布特性,采用于式磁选方法对该矿进行了除铁工艺研究,获得了含Fe2O3小于0.2%,产率大于80%的精矿.研究成果巳得到了工业应用.  相似文献   

11.
大红山微细粒铁尾矿沉降特性研究   总被引:2,自引:0,他引:2  
本文以大红山铁尾矿的充填为研究对象,研究了尾矿的粒度分布和自然沉降特性,比较了PAM和CBC-T对矿浆的沉降效果.研究结果表明:大红山铁尾矿属于微细粒尾矿的范畴,由于颗粒细、沉降速度慢、含水率高,很难满足充填要求;采用PAM进行絮凝处理,可以提高沉降速度,但絮体结构疏松,对胶结体强度有不良影响;采用CBC-T处理矿浆,能够显著地提高沉降速度和改善水质,在1 h内使沉降体浓度提高到60%以上,能够满足充填工程对尾矿的技术要求.  相似文献   

12.
    
BACKGROUND: Reject water (return liquor) from dewatering of anaerobically digested activated sludge in municipal wastewater treatment plants contains from 10 to 50% of the phosphorus load when being recycled to the aeration tank. Phosphorus removal from reject water could be an effective way to decrease phosphorus loads entering the aeration tank. An innovative approach involves the replacement of iron salts, which are commonly used for phosphorus removal, with ferrous ions produced by iron‐reducing bacteria from iron ore. The aim of the research was to examine the feasibility of phosphorus removal from return liquor using bioreduction of iron ore. RESULTS: Ferrous production, phosphate and organic carbon removal rates were determined as a function of different iron ore particle sizes in batch experiments. Iron‐reducing bacteria ensured the production of ferrous ions from iron ore up to concentrations of 550 mg L?1. The ferrous production rate was linearly dependent on the calculated specific surface area of the iron ore particles. The phosphorus concentration in the reject water was reduced by 90% during bioreduction of iron ore. The phosphorus removal rate did not depend on specific surface area of iron ore particles when the particle size of iron ore was smaller than 7 mm. The organic carbon removal rate did not seem to be dependent on iron ore particle size. CONCLUSION: Removal of phosphate using iron ore can be more economical than conventional chemical precipitation of phosphate using iron salts because of the lower cost of iron ore. Copyright © 2008 Society of Chemical Industry  相似文献   

13.
    
Polybenzoxazine (PBZ) xerogels have been synthesized via quasi solventless method and coated with silver nanoparticles using the layer‐by‐layer (LbL) deposition method. After coating, the samples were carbonized at 800 °C to obtain high surface area porous carbon materials to be used for CO2 storage. Evidences of the successful LbL deposition of the coating was provided by ultraviolet–visible and attenuated total reflection–Fourier transform infrared spectroscopy and the silver nanoparticles top layer was confirmed by scanning electron microscopy–energy‐dispersive X‐ray spectroscopy, transmission electron microscopy, X‐ray diffraction, and X‐ray photoelectron spectroscopy. Results showed that the samples coated with silver nanoparticles displayed an increased CO2 capacity from 3.02 to 3.39 mmol g?1 when compared with the plain carbon PBZ. The LbL method for the modification of the pore surface in porous PBZ is simple and allows the facile tuning of the inner PBZ pore's surface chemistry with metallic nanoparticles that could be enhanced CO2 storage capacity. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45097.  相似文献   

14.
    
Dibenzylidene sorbitol (DBS) was chosen as an in situ forming nucleating agent to study ultrahigh molecular weight polyethylene (UHMWPE) crystallization and microporous membrane. The experimental results indicated that DBS self‐assembled into fibrils first and the solution became a physical gel before UHMWPE crystallization during thermally induced phase separation (TIPS) of UHMWPE/liquid paraffin (LP)/DBS solution, and the temperature of DBS self‐assembly shows a strong dependence of DBS concentration. With decreasing temperature further, DBS fibrils as heterogeneous nucleating agent accelerated UHMWPE crystallization, which was showed more clearly in UHMWPE/LP/DBS phase diagram. UHMWPE microporous membranes were prepared through TIPS method with the control of DBS concentration. It was found that UHMWPE microporous membranes in the presence of DBS fibrils show small porous size and low water permeability, but relatively larger mechanical strength. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40706.  相似文献   

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In this study, multilayer films containing chitosan, tin disulfide (SnS2) nanoparticles, and single‐walled carbon nanotubes were prepared on glassy carbon electrodes with the use of a layer‐by‐layer assembly technique. The resulting films were characterized with cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scanning electron microscopy, and ultraviolet–visible absorption spectroscopy. The results of CV and EIS indicates that the peak currents and charge‐transfer resistance all had linear responses to the number of assembled layers. The multilayer‐film‐modified electrode showed excellent electrocatalytic properties for some species, such as dopamine hydrochloride (DA), ascorbic acid (AA), and uric acid (UA). The well‐separated voltammetric signals of DA, UA, and AA could be obtained on the assembled multilayer‐film‐modified electrode, and the peak‐to‐peak potential separations were 171, 136, and 307 mV for DA–UA, DA–AA, and UA–AA on CV, respectively. These facts showed that the multilayer‐film‐modified electrode could be used as a new sensor for the simultaneous detection of DA and UA in the presence of AA in a real sample. In addition, the multilayer films were stable, selective, and reproducible. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013  相似文献   

16.
为了利用磁选含磷尾矿中的磷资源,在水玻璃和L2-Z作为硅酸盐矿物抑制剂的条件下,采用一粗一精的正浮选流程进行了浮选试验。结果表明,在磷矿浮选中添加L2-Z后,获得的磷精矿中Mg O质量分数降至1.0%以下,磷精矿的P2O5质量分数提高至36%以上。由此得出,L2-Z抑制剂对硅酸盐具有较好的抑制效果。  相似文献   

17.
为了脱除高铁铝土矿里的铁,提高铝土矿的溶出性能,分别采取磁选和重选的方法,研究不同磁场强度,矿石粒度对矿石磁选的影响,不同矿石粒度对铝土矿重选的影响,实验结果表明,采用磁选方法,较佳条件为矿石粒度-0.074mm,95%,磁场强度为1.2T,A12O3,回收率为72.86%,Fe2O3,的脱除率为77.31%,采用重选方法,较佳条件为矿石粒度为-0.074inrn,85%,此时A1203的回收率为65.15%,Fe20,脱除率73.24%。  相似文献   

18.
    
Despite recent significant progress in fabricating tough hydrogels, it is still a challenge to realize high strength, large stretchability, high toughness, rapid recoverability, and good self‐healing simultaneously in a single hydrogel. Herein, Laponite reinforced self‐cross‐linking poly(N‐hydroxyethyl acrylamide) (PHEAA) hydrogels (i.e., PHEAA/Laponite nanocomposite [NC] gels) with dual physically cross‐linked network structures, where PHEAA chains can be self‐cross‐linked by themselves and also cross‐linked by Laponite nanoplatelets, demonstrate integrated high performances. At optimal conditions, PHEAA/Laponite NC gels exhibit high tensile strength of 1.31 MPa, ultrahigh tensile strain of 52.23 mm mm?1, high toughness of 2238 J m?2, rapid self‐recoverability (toughness recovery of 79% and stiffness recovery of 74% at room temperature for 2 min recovery without any external stimuli), and good self‐healing properties (strain healing efficiency of 42%). The work provides a promising and simple strategy for the fabrication of dual physically cross‐linked NC gels with integrated high performances, and helps to expand the fundamentals and applications of NC gels.  相似文献   

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设计了一种中心吸附铁化合物的磁力旋流器,利用试验和数值模拟的方法,对比分析了磁力旋流器磁场强度和分离性能。在试验中,简化了磁力旋流器磁系的结构,改变导磁铁片厚度、铁芯结构、磁系结构等参数,分析磁系对含铁化合物的吸附能力。利用数值模拟方法得到磁系的磁场强度,为分离能力预测提供依据。结果表明:磁场强度与导磁铁片的厚度成反比,随着导磁铁片厚度增大,磁场强度减小,磁力旋流器对铁化合物颗粒的吸附能力减弱,试验中导磁铁片的厚度为2mm时分离效果最好;铁棒铁芯磁系与铁管铁芯磁系相比具有更大的磁场强度;挤压式磁系与普通磁系相比具有更大的磁场强度。导磁铁片厚度的增大会使磁系端面漏磁量减少,铁芯侧面漏磁量增大;铁棒铁芯磁系的漏磁量相对较小,挤压式磁系的漏磁相对较小。  相似文献   

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