电解锰渣制备陶瓷砖

为减少电解锰渣对环境的污染,降低重金属锰的毒性,研究了以电解锰渣为主要原料制备陶瓷砖。首先利用CaO-Al2O3-SiO2三元系统相图获得初始配方,然后用正交试验法确定最优配方。在最优配方中,电解锰渣的质量分数高达40%。采用较低温度快速烧成工艺,烧成温度为1079℃,烧成时间为30min。制得的陶瓷砖主晶相为普通辉石与锰钙辉石,吸水率为1.86%,主要性能指标符合GB/T4100-2006《陶瓷砖》中的BⅠb类标准。实验结果显示,重金属锰出现在锰钙辉石的晶格中,成为其晶体结构的组成部分,完成了对锰的解毒。  

软锰矿浆烟气脱硫吸收液制取电解锰的工艺研究

对"软锰矿浆烟气脱硫制取电解锰、高纯碳酸锰及硫酸铵的废气脱硫资源化" 体系中脱硫吸收液制取电解锰的工艺进行了实验研究.在吸收液中先加双氧水将Fe2 氧化成Fe3 ,再加氨水调节pH值至5.5±0.5后过滤除铁,进而在滤液中按约50 mL(L(1的配比添加硫化铵, 经沉淀过滤后去除重金属.将除杂后的滤液在采用银、锡、锑、铅合金作阳极板,1Crl8Ni9Ti不锈钢板作阴极板,涤纶布作隔膜制成的电解装置进行直流电解,考查了各电解工艺参数对电流效率和槽电压的影响.结果表明电解工艺参数的较佳控制范围为:电流密度390A·m- 2左右,温度35℃左右,硫酸铵浓度110 g(L(1左右,SeO2添加量约0.04 g(L(1,槽液锰浓度约18 g(L(1,进液锰浓度约26 g(L(1,进液pH值8左右,制得的电解锰质量达到GB3418-82要求.研究结果表明,软锰矿烟气脱硫吸收液制取电解锰的工艺是可行的,开辟了一条软锰矿脱硫吸收液资源化利用的新途径.  

β—氧化铅电极在制备电解锰中的应用

添加１～２ｇ／Ｌ十六烷基三甲基溴化铵并结合空气搅拌，研制出阳极电位低、致密无针孔、可用于ＭｎＣｌ２体系制备电解金属锰的石墨基二氧化铅电极。用该电极作阳极，从ＭｎＣｌ２体系制备电解金属锰，可克服石墨阳极的缺点，并具有可使用更高阳极电流密度（７００～９００Ａ／ｍ２）和阳极放氯量少的优点。  

电解锰渣替代石膏生产水泥的试验研究

电解锰渣为含CaSO4·2H2O较高的工业废料,如果加以利用,将获得较好的经济效益与社会效益。实验将锰渣分别进行105℃低温烘干和300℃高温锻烧处理,然后替代石膏配制水泥试验并按国家标准检测方法进行相关水泥性能试验。结果表明,电解锰渣的缓凝作用虽差于天然石膏,但可完全替代天然石膏生产水泥;且高温锻烧处理的电解锰渣的缓凝和增强作用,均好于低温烘干料。  

铜负载树脂去除电解锰废水中高浓度氨氮的研究

采用自制的铜负载D113树脂处理电解锰废水中高浓度氨氮,通过静态吸附试验,确定了最佳吸附与再生条件。模拟电解锰废水中氨氮的质量浓度为1 141.07 mg/L,在最佳试验条件下通过三级吸附交换,出水氨氮质量浓度为11 mg/L,达到GB 8978—1996《污水综合排放标准》要求,去除率达到99%;以1.5 mol/L的H2SO4作为再生剂对吸附饱和的树脂进行脱附再生,再生液多次脱附再生后可回用于电解锰生产工艺中,同时实现了废水的有效治理和资源的回收利用。  

电解金属锰中微量铅镉的极谱法连续测定

在氨基乙酸-氯化铵-盐酸羟胺底液中,Pb(Ⅱ)于-0.55 V(vs,SCE),Cd(Ⅱ)(vs,SCE)于-0.74 V产生一个灵敏的导数极谱波,铅的浓度在0.02~10μg/mL、镉的浓度在0.01~5μg/mL范围内与波高呈线性关系,大量的Mn2+使铅镉的波高下降,通过分离锰后可消除干扰。电解金属锰试样经硝酸分解后,利用高氯酸在加热至冒烟时的强氧化性,将锰离子氧化为MnO2予以分离后,可直接在上述条件下进行测定,铅标准回收率94.80%~102.20%,相对标准偏差0.43%~0.86%;镉标准回收率96.60%~101.80%,相对标准偏差2.37%~4.62%。  

电解二氧化锰制备技术的研究现状及展望

介绍了电解二氧化锰（EMD）工业的发展趋势,详细的评述了EMD的制备、掺杂改性等方面的研究进展情况,并对EMD新工艺的发展趋势作了展望,同时对中国电解二氧化锰工业的发展提出了一些建议。  

An electrochemical quartz crystal microbalance study into the deposition of manganese dioxide

An electrochemical quartz crystal microbalance (EQCM) has been used to study the effects of electrolyte composition (MnSO₄ and H₂SO₄ concentrations) and anodic current density on the electrodeposition of manganese dioxide. The EQCM, in tandem with the electrode voltage during deposition, has been used to characterize features of the deposition mechanism such as the relative lifetime of the Mn(III) intermediate, the rate of soluble Mn(III) hydrolysis to form MnOOH, and the porosity of the resultant manganese dioxide deposit as a function of crystal nucleation. The connection between the results obtained here and commercial electrodeposition of manganese dioxide were also discussed.  

Electrochemical behaviour of titanium in H2SO4-MnSO4 electrolytes

The corrosion of titanium in H₂SO₄ electrolytes (0.001-1.0 M) at temperatures from ambient to 98 °C has been investigated using steady-state polarization measurements. Four distinct regions of behaviour were identified, namely active corrosion, the active-passive transition, passive region and the dielectric breakdown region. The active corrosion and active-passive transition were characterized by anodic peak current (i_m) and voltage (E_m), which in turn were found to vary with the experimental conditions, i.e., d(log?(im))/dpH=−0.8±0.1 and dE_m/dpH which was −71 mV at 98 °C, −58 mV at 80 °C and −28 mV at 60 °C. The activation energy for titanium corrosion, determined from temperature studies, was found to be 67.7 kJ mol⁻¹ in 0.1 M H₂SO₄ and 56.7 kJ mol⁻¹ in 1.0 M H₂SO₄. The dielectric breakdown voltage (E_d) of the passive TiO₂ film was found to vary depending on how much TiO₂ was present. The inclusion of Mn²⁺ into the H₂SO₄ electrolyte, as is done during the commercial electrodeposition of manganese dioxide, resulted in a decrease in titanium corrosion current, possibly due to Mn²⁺ adsorption limiting electrolyte access to the substrate.  

Charge cycling and impedance characterization of a polyphosphazene solid polymer electrolyte-manganese(IV) oxide intercalation cathode

The compatibility of polyphosphazene (PPZ) polymer electrolytes with MnO₂/C/SPE intercalation cathodes (IC) was investigated. Three-layered laminates of a phosphazene-based solid polymer electrolyte (SPE) film sandwiched between two MnO₂-based ICs (one preloaded with lithium) were constructed. The cathodes were fabricated by either solvent casting or compression techniques. Two different crystal forms of manganese(IV) oxide—λ-MnO₂ and γ-MnO₂—were employed, together with methoxy ethoxy ethoxy PPZ (MEEP) SPE binder material. Carbon black was employed as the electronically conductive phase. One cathode in each laminate was prepared in the ‘chemically intercalated’ form by using LiMn₂O₄ in place of MnO₂. The podand polymer, SMEP, which has better thin film mechanical properties than does MEEP, was complexed with lithium trifluoromethane sulfonate (Li triflate) and used as the SPE. Li⁺ ions were cycled galvanostatically between the two-ICs, through the phosphazene-based SPE layer. The performance of the cell was continuously monitored by electrochemical impedance spectroscopy (EIS) and by measuring the laminate thickness and voltage drop. The method of cathode fabrication (casting vs. pressing) was found to be the primary factor influencing the cycle life.