共查询到16条相似文献,搜索用时 234 毫秒
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研究了用201×7强碱性阴离子交换树脂对氯化浸出液中低浓度铂的吸附性能,考察了树脂用量、吸附时间、pH值、反应温度等因素对树脂吸附铂的影响。实验结果表明,pH=1.0时树脂的吸附效果最佳,静态饱和吸附容量可达到190 mg Pt/g干树脂,铂在201×7树脂上的吸附是吸热反应,温度升高有利于铂的吸附,吸附反应热焓变ΔH=36.72 kJ/mol,熵变为ΔS=0.190 kJ/(mol·K)。对201×7树脂吸附铂的吸附等温模型及动力学进行了分析,结果表明,吸附平衡过程符合Langmuir等温式,且为优惠吸附;铂的吸附过程符合准二级动力学方程,准二级常数为k2=1.58×10-4g/(mg·min)。用2.4 mol/L的高氯酸可将载铂树脂中的铂洗脱,洗脱率为83%。 相似文献
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《中国有色金属学报》2018,(11)
采用"焙烧-硫酸浸出-中和沉淀"工艺提取明矾石精矿中的镓,获得含Ga 0.1%以上的镓精矿。为了实现镓精矿的高值化利用,提出"碱浸-离子交换-溶液净化-电积"回收镓精矿中金属镓的工艺,对最佳工艺条件进行研究。在最佳工艺条件下,镓精矿中Ga的碱浸浸出率达98.46%;离子交换实验表明,采用D5240树脂可以有效地富集镓,但杂质钒也得到富集,树脂解吸液中含镓2.1g/L,钒0.23g/L;在pH=12的条件下,可通过钙盐法除钒,当解吸液中Ca~(2+)添加量为0.02mol/L时,钒浓度降至1.45mg/L;镓电积过程中电流效率呈现先增大后减小的趋势,当电积时间为2h时,电流效率达到峰值4.3%;随着电积液中NaOH浓度的升高,阴极表面形貌由粗糙变得光滑。当NaOH浓度为200g/L时,阴极表面平整光滑,可获得99.94%金属镓。 相似文献
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采用离子交换树脂法吸附铬(Ⅲ),通过树脂选型确定强酸性阳离子交换树脂001×14.5对铬(Ⅲ)吸附容量最大,用所选的001×14.5树脂研究铬(Ⅲ)的吸附性能。静态吸附实验表明:转速大于120 r/min时,对树脂吸附的影响可忽略,即外扩散基本消除,pH=7.0时,吸附最佳,铬(Ⅲ)吸附率随树脂用量的增加而增大;001×14.5树脂吸附铬(Ⅲ)的过程符合Langmuir等温曲线,且为优惠吸附;吸附过程符合拟二级动力学方程,吸附过程的表观活化能Ea=23.4 kJ/mol,颗粒内扩散为吸附速率的主要控制步骤;用1 mol/L的硫酸对吸附后的饱和树脂进行脱附再生,脱附率可达99%。 相似文献
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采用大孔型树脂在酸性条件下处理高浓度钨酸钠溶液发现,D301大孔型弱碱性阴离子树脂处理高浓度钨酸钠溶液时性能最佳。考察交前液pH值、树脂粒径、WO3浓度、温度以及搅拌速度对离子交换过程的影响。结果表明:在溶液pH值约为6时、树脂粒径为0.42~0.59 mm、WO3浓度为350 g/L、温度为25℃的条件下,D301树脂吸附效果最佳,吸附的WO3容量达到850 mg/g干树脂,远高于传统的201×7树脂的吸附容量。 相似文献
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昆明贵金属研究所一室与化学制品车间合作,研究了从废铂铑(含少量铱)合金溶解液中,用萃取法分离提纯铂和铑的工艺流程.其方法要点是①用P204(二-2-乙基己基磷酸)萃取铑,分离铂和铑;②粗铑溶液通氯气氧化,用TAPO(三烷基氧化膦)萃取其中的微量铂、铱等贵金属杂质以纯化铑,离子交换除贱金属,甲酸还原,氢还原得纯铑;③粗铂溶液用氧化载体水解法提纯,氯化铵沉淀,锻烧得纯铂.原料溶液成分 相似文献
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The adsorption behavior of Cd2+ on 001×7 strong-acid cation exchange resin was studied with the static adsorption method. The adsorption process was analyzed from thermodynamics and kinetics aspects. The influences of experimental parameters such as pH, temperature, initial concentration and adsorption rate were investigated. The experimental results show that in the studied concentration range, 001×7 resin has a good sorption ability for Cd2+, and the equilibrium adsorption data fit to Freundlich isotherms. The adsorption is an exothermic process which runs spontaneously. Kinetic analysis shows that the adsorption rate is mainly governed by liquid film diffusion. The best adsorption condition is pH 4-5. The saturated resin can be regenerated by 3 mol/L nitric acid, and the desorption efficiency is over 98%. The maximal static saturated adsorption capacity is 355 mg/g (wet resin) at 293 K. The adsorption mechanism of Cd2+ on 001×7 resin was discussed based on IR spectra. 相似文献
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《中国有色金属学会会刊》2022,32(7):2438-2450
This study assessed the adsorption process and the reaction kinetics involved in the selective recovery of vanadium from an acid solution containing iron as an impurity. Four commercial resins were studied: Lewatit® MonoPlus TP 209 XL, Lewatit® TP 207, Dowex? M4195 (chelating resin) and Lewatit® MonoPlus S 200 H (strong cationic exchange resin). To investigate the effect of time on the adsorption process, batch experiments were carried out using the following initial conditions: pH 2.0, 298 K, and a proportion of 1 g of resin to 50 mL of solution. The variation of pH over time was analyzed. Chelating resin released less H+ ions as the adsorption occurred, resulting in a lower drop of pH when compared to S 200 H resin. Ion adsorption by the resins was also evaluated through FT-IR and SEM?EDS before and after the experiments. Among the evaluated kinetic models (pseudo-first order, pseudo-second order, Elovich and intraparticle diffusion models), the pseudo-second order model best fits the experimental data of the adsorption of vanadium and iron by all of the four resins. M4195 resin showed the highest recovery of vanadium and the lowest adsorption of iron. Kinetic data, which are fundamental to industrial processes applications, are provided. 相似文献
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利用沉钨钼后液首先经氯化钾沉淀反应得到铼酸钾,其次采用离子交换法将铼酸钾溶液转为高铼酸溶液,最后经氨水中和-浓缩结晶-重结晶得到高纯铼酸铵。结果表明:向沉钨钼后液中加入KCl固体再浓缩析出KReO4白色晶体,其主要杂质Na、Ca、Fe、Cl含量均小于1.00%,特别是W、Mo含量均小于0.10%,且Re结晶率可达94.92%~98.38%。采用动态法脱K,选用C160(H+型)树脂,当KReO4溶液pH为中性,料液流速控制在2BVs·h-1时,C160树脂对K+穿透容量和饱和容量分别为117.87和128.39g·L-1,且树脂利用率达到91.81%;所得纯HReO4溶液中K、Na、Ca、Fe、W、Mo、Mg浓度均降至0.50 mg·L-1以下。通过添加优级纯氨水中和HReO4溶液,控制终点pH为7~8,再经浓缩结晶+1次重结晶,所得铼酸铵纯度达到99.99%以上,其SEM形貌为树枝状。 相似文献
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虽然离子交换法是从拜耳法种分母液中回收镓的最有效的方法,但由于淋洗难的问题未能解决,国内外虽经十余年的研究,该法仍未能取得应用.本文叙述了用离子交换法从生产Al2O3的种分母液中回收镓的实验结果,由于开发成功碱性络合淋洗剂,解决了镓树脂因酸性淋洗而引起的降解问题,为离子交换法回收镓提供了实现工业化的可能.实验结果表明种分母液温度降至50℃~55℃后,不经其他任何处理就可进吸附柱.吸附后的种分母液返回Al2O3生产流程,饱和树脂用稀碱溶液洗涤,然后用碱性络合淋洗剂进行淋洗,淋洗率大干95%,所得淋洗液含镓大于2g/l,净化并电解后可得到99.99%的金属镓.由于本工艺流程简单,试剂便宜,消耗少,产品成本低.三废处理量少,对环境污染小,生产上具有明显的经济效苴. 相似文献