超贫钒钛磁铁矿综合回收铁磷选矿工艺研究

对某地超贫钒钛磁铁矿中的铁及伴生磷进行了弱磁选回收铁、浮选回收磷的试验研究。结果表明,原矿在第一段磨矿细度为-200目占50%、第二段磨矿细度为-200目占80%的条件下,通过弱磁选可获得铁品位64.42%、回收率为55.45%的铁精矿;磁选尾矿经一次粗选三次精选一次扫选,可获得品位P2O535.36%、回收率93.83%的磷精矿。     

江苏某榴辉岩型金红石矿综合利用研究

针对江苏某榴辉岩型金红石矿性质和特点,采用了“磁选—重选—磁选”联合工艺流程,在获得金红石精矿含TiO2品位为90.09％,金红石回收率为63.07％的基础上,还可获得纯度为90％的石榴石与纯度为86.59％的绿辉石精矿,回收率均大于76％.试验结果为该矿的开发利用提供了合理的工艺参数和工艺指标.     

云南某硅酸盐型铁矿选矿试验研究

随着富矿开采日渐枯竭,贫矿开发的重要性越发显著.本文以云南具有代表性的某硅酸盐型低品位铁矿为研究对象,对其进行了详细的工艺矿物学研究,并根据原矿性质特点进行选矿试验研究,分别进行了弱磁选以及弱磁尾矿的强磁选、摇床重选及还原焙烧—弱磁选等试验,并最终确定了弱磁选提磁铁矿和还原焙烧—弱磁选提赤铁矿、褐铁矿的选矿流程.通过两步磁选,获得的铁精矿平均铁品位为60.07％,铁回收率为74.35％.     

磷钛矿浮选工艺研究

为了综合回收某磷钛矿中的磷和钛,采用先浮选可浮性好的磷矿石,再浮选钛铁矿的流程进行浮选实验,获得磷精矿P2O5品位36.99%,回收率89.07%;钛精矿TiO2品位47.17%,回收率51.33%的指标.达到了综合回收磷和钛的目的.     

川西地区某锂辉石矿选矿试验探讨

对川西某锂辉石矿的矿石特征进行了研究,在此基础上进行了重选试验、浮选试验以及含铁锂辉石精矿再选降铁试验,提出了采用重选加磁选回收钽铌矿物及锡石,浮选回收锂辉石的工艺流程。采用螺旋溜槽粗选、摇床精选得到钽铌和锡石混合精矿,通过磁选可有效分离钽铌矿物和锡石,最终获得精矿品位Ta_2O_5为19.66%、回收率43.78%,SnO_2品位为67.56%、回收率45.53%的指标;采用碳酸钠和氢氧化钠调浆,氧化石蜡皂、环烷酸皂为捕收剂,经一粗二扫的浮选流程可得到精矿品位Li_2O为6.04%,回收率85.88%的较好指标;对含铁锂辉石精矿经过弱磁、强磁选别后,再经酸洗处理,可提高锂辉石精矿品位,降低其铁含量。     

高硫磁铁矿石的选矿

武安高硫磁铁矿石用常规药剂，在弱碱性介质中浮选，浮选尾矿经弱磁选．可以获得硫精矿和铁精矿。硫精矿品位42．14％，回收率95．18％；铁精矿品位66．48％，回收率78．43％，含硫0．26％。符合冶炼对产品质量的要求。     

旬阳镜铁矿选矿与深加工试验研究

旬阳镜铁矿原矿全铁品位在57％左右，单一强磁选获得TFe65％以上的铁精矿，回收率大于85％，用摇床或螺旋溜槽进行重选也能选出品位合格的铁精矿，但回收率显著低于强磁选。浮选可产出高纯镜铁矿，再细磨可制得油漆填料云母氧化铁。     

某低品位矾矿选矿试验研究

浙江某低品位矾矿矿石性质复杂,嵌布粒度细,采用一次粗选三次精选两次扫选中矿依次返回的碱法浮选流程进行浮选试验,再将浮选得到的明矾石精矿经高梯度强磁选除铁,最终获得的明矾石精矿含Fe2O31.71％,SO3品位28.78％,SO3回收率82.23％.产品质量超过了明矾石特级品要求.     

攀枝花低品位钒钛磁铁矿磨矿研究

为了回收利用攀枝花低品位钒钛磁铁矿,通过单因素试验和正交试验研究了磨矿时间、磨矿矿浆质量分数、钢球充填率、钢球配比对该低品位钒钛磁铁矿磨矿细度的影响,结果表明磨矿时间是影响磨矿细度和单体解离度的主要因素。试验得到的最佳磨矿参数为:磨矿时间7min,磨矿矿浆质量分数55%,钢球充填率40%,钢球配比大球∶中球∶小球=1∶1.3∶2.2,在最佳磨矿参数下得到的磨矿细度为-200目质量分数占73.7%。弱磁选试验获得的钛精矿TiO_2品位为10.003%、回收率为86.05%。本研究成果为攀枝花低品位钛资源的综合利用提供了技术支持。     

临沂低品位钛矿的矿物组成及铁钛元素的分布状态

采用矿物自动分析系统研究了山东临沂低品位钛矿的矿物组成和铁、钛元素的分布状态. 结果表明,TFe和TiO2品位分别为14.25%和6.68%,矿石中磁铁矿、钛铁矿及榍石含量分别为2.60%, 5.40%和8.27%;脉石矿物以角闪石为主,其次是斜长石. 矿石中磁性铁含量仅为1.88%,占全铁总量的13.21%;钛在矿石中的分布较分散,其中40.69%分布在钛铁矿中,44.14%分布在榍石中. 以榍石和钛铁矿为目的矿物,理论上,选矿时可生产TiO2品位为41.45%的混合钛精矿,钛精矿产率为13.67%,钛的选矿回收率为84.83%.     

Cu2+对泥鳅急性毒性试验

基于目前水环境重金属污染事件的频繁发生,人们对水生态系统的关注也越来越高.一些重金属在水体中可转化为持久的高毒性的金属化合物,通过在机体内富集并通过食物链放大从而威胁到人们的身体健康.[1]本文选用铜离子对泥鳅进行了急性毒性试验,用以对环境监测和鱼类养殖提供理论上的参考.     

槲皮素抗菌活性的研究

以大肠杆菌、金黄色葡萄球菌等为实验菌株,采用药敏纸片法考察槲皮素的抗菌活性.槲皮素对金黄色葡萄球菌的抗菌效果最好,最低杀菌浓度小于0.0061 μmol·mL-1;对胶质芽孢杆菌抗菌效果次之,最低抑菌浓度小于0.0061 μmol·mL-1;对大肠杆菌、苏云金芽孢杆菌、枯草芽孢杆菌、铜绿假单胞菌也有较为明显的抗菌效果,最低抑菌浓度分别为0.0242 μmol·mL-1、0.0061 μmol·mL-1、0.0485 μmol·mL-1、0.0121 μmol·mL-1,最低杀菌浓度分别为1.5522 μmol·mL-1、6.2086 μmol·mL-1、3.1043 μmol·mL-1、1.5522 μmol·mL-1;对人仓白杆菌无抗菌效果.槲皮素具有广谱抗菌性,并且对革兰氏阴性菌的抗菌作用强于革兰氏阳性菌.     

麦芽糖醇的纳滤浓缩

为了节约能耗,采用D和G 2种纳滤膜对麦芽糖醇进行了提纯和浓缩研究。实验中用G膜去除麦芽糖醇中的多糖醇,用D膜除去山梨糖醇和水分。研究结果表明:渗透液的通量随压力、循环流量和温度的增加而增大,而随物料质量分数的增加而减小;另外,截留率随压力和循环量的增加而增大,而随物料的质量分数和温度的增加而减小。综合考虑操作条件对分离效果的影响,最后确定了适宜的操作条件,对于D膜,操作压力为1.2—1.5 MPa,循环流量60—100 L/h;对于G膜,操作压力为1.0—1.2 MPa,循环流量40—60 L/h,操作温度均为40—45℃。     

Synthesis and some studies on fluorinated cationic surfactants: surface and biocidal activities

Three fluorinated cationic surfactants were prepared by condensing N-(2-bromoethyl)perfluoroalkylamides with stoichiometric amounts of pyridine, triethanolamine, and triethylamine to produce three quaternary ammonium salts. The surface and biocidal properties of these surfactants were investigated to find the relation between the structure of the hydrophilic portion of the compounds and their efficiency as biocides. The properties studied included critical micelle concentration (CMC), effectiveness (II_CMC), surface excess concentration (T_max), and area occupied by a molecule (A_min). Free energies of micellization (ΔG _mic ^o) and adsorption (ΔG _ads ^o) of the surfactants in aqueous solution were calculated. The minimal inhibitory concentrations of the prepared compounds were tested against five strains as representative group of microorganisms.     

影响防垢剂效果的因素分析

讨论了不同防垢剂、加药浓度、钙离子浓度对防垢效果的影响,以现场水为介质对防垢剂效果进行了评定,确定其影响因素最大的是水质条件,并针对不同的水质进行了一系列的试验。找出了影响防垢剂防垢效果的因素,并对其进行了分析。     

Effectiveness of Amine Concentration and Circulation Rate in the CO2 Removal Process

Optimization of an amine-based method is vital to ensure product quality, equipment safety, and system efficiency. Here, the effectiveness of amine concentration and circulation rate is evaluated for a diglycolamine (DGA)-based facility. The performance is measured using the concentration of carbon dioxide in the treated gas and the net acid gas loading of the amine solution. Both amine concentration and circulation rate were observed to affect the system efficiency. An optimal operating range was identified for the gas plant studied established on the performance criteria. The analysis is based on a proprietary mass transfer-based process simulator of an amine-based acid gas treating facility and field data.     

Effect of Benzheterazoles on the Micellar Behavior of Sodium Dodecylsulfate in Dimethylsulfoxide: A Conductometric and Spectroscopic Approach

In this article, we report intermolecular interactions in terms of the effect of benzfused heterocyclic compounds, i.e., 2-thioureidobenzimidazole and 2-thioureidobenzoxazole (0.00, 0.01, and 0.05 mol kg⁻¹), on the micellization behavior of sodium dodecylsulphate (SDS) (1–52 mmol kg⁻¹) in dimethylsulphoxide (DMSO) at different temperatures (293.15–313.15 K) through conductometric and spectroscopic investigations. The variation of specific conductance with SDS concentration has been utilized to estimate the critical micelle concentration ( CMC). The above-performed techniques infer that the presence of additives results in a decrease in the CMC values. Various standard thermodynamic parameters such as free energy change (), enthalpy change (), and entropy change () of micellization have been determined using the temperature dependence of CMC. The above calculated parameters and also UV–visible and fluorescence spectroscopy have been used to obtain information regarding the various interactions between the compounds and surfactant aggregates. In addition, an attempt has also been made to examine the minimum inhibitory concentration (MIC) of the heterocompounds, which indicates the effectiveness of these compounds against fungus growth at a particular concentration. These synthetic heterocyclic compounds find increasing applications in material science, medicinal chemistry, and biochemistry due to their antifungal and antioxidant properties.     

铬酸浓度对铝阳极氧化多孔膜阻挡层形成过程的影响

对铝在不同浓度的铬酸中阳极氧化多孔膜阻挡层形成过程进行研究,随着铬酸浓度的增加,阻挡层形成电流密度增加,形成阻挡层所需的时间减少,阻挡层厚主变薄。这些现象可归结为阻挡层形成时应力集中的结果。     

十二烷基苯磺酸钠表面张力的研究

通过表面张力的测定,研究了浓度、温度对溶液表面张力的影响,同时考察无机盐浓度对溶液表面张力的影响.结果表明:十二烷基苯磺酸钠溶液表面张力随浓度的增加、温度的升高和无机盐浓度逐渐的增大而降低,最终确定其CMC值为1.47×10-3mol/L,由于键能和水合离子半径的原因,NaCl对十二烷基苯磺酸钠表面张力的影响明显于KCl.     

改进磷酸浓缩换热方式 提升浓缩运行周期

针对全球磷矿资源贫化,浓缩装置产能、开车周期大幅下降的现状,对浓缩工艺进行改造:采取稀磷酸不过滤澄清,并经蒸汽预加热至80℃进入浓缩系统;在稀酸中添加抗沉积剂,减缓结垢;控制适宜浓缩磷酸浓度和优化石墨换热器结垢清洗工艺。改造后浓缩产能提升30%,运行周期达28~30 d,提高DAP产量相当于年增产值3 600万元,节约蒸汽费用14.2万元。