辉钼矿焙烧烟气淋洗液中铼的富集

利用离子交换法对淋洗液中铼的富集进行了研究,结果表明,采用凝胶型强碱性阴离子树脂201×7可以较好地吸附淋洗液中的铼,吸附后先用5%NH4OH+5 g/L NH4Cl解吸掉大部分的钼,再用2 mol/L的NH4SCN解吸铼,可以得到含铼1 g/L以上的富铼溶液。     

钼精矿浸出液中铼与钼的分离试验研究

以钼精矿浸出液为研究对象,通过离子交换试验,实现了铼与钼的有效分离。结果表明,在最佳试验条件下,即采用201#树脂为离子吸附剂,浸出液pH=8.5,流速为20mL/min时,铼的吸附率可达99.97%,其饱和吸附容量达43.66g/kg;采用9%NH4SCN为解吸剂,铼的解吸率可达99.99%,201#树脂再生性能良好,适宜循环使用。     

石煤浸出液离子交换法提钒的研究

选择了几种离子交换树脂,对石煤酸浸含钒液在不同条件下进行离子交换实验.结果表明:采用离子交换法能够很好地除去浸出液中大部分杂质,并能使钒得到富集;不同树脂对钒的吸附均受吸附时间、溶液pH值等实验条件的影响,不同解吸剂与解吸时间也会影响树脂解吸的效果;1#树脂吸附率在4h左右可达到99%的最大吸附能力,选择合适的解吸剂可在4h内使钒的解吸率达到95%以上;解吸液经过净化,沉钒,煅烧后得到的五氧化二钒纯度在99%以上.     

钼精矿焙烧烟道灰中铼的回收

含铼钼精矿经外加热式回转窑焙烧,伴生的稀贵金属铼进入烟尘,采用自激式高效收尘方式和装置进行回收,对焙烧烟尘中的主要成分进行分析,研究了浸出过程的主要影响因素:浸出剂、酸度、温度、时间、液固比等,把回收的含铼钼粉尘进行溶解,通过添加氧化剂,提高铼的浸出率,将含铼溶液,选择强碱性阴离子交换树脂201×7吸附,再用萃取剂萃取,用7N的氨水反萃,铼进入反萃液中,再用氨水解吸、蒸发、结晶得高铼酸铵。该工艺有效的回收了烟尘中的铼,粉尘回收率可达到98%以上,减少粉尘排放,降低环境污染;烟尘中的铼的浸出率在98%以上;溶液中铼的吸附率在99%以上,附铼树脂上铼的解析率在99%以上;铼酸铵纯度≥99.99%,总回收率≥98%;提高了矿产资源综合利用率及经济效益,为企业增加了新的经济增长点。     

201×7树脂吸附回收提金尾液中的氰化物及金属铜

研究了201×7树脂吸附回收提金尾液中氰化物及金属铜的技术。通过对树脂的饱和吸附量、吸附速率及吸附等温线的研究,得到了201×7树脂对氰化物的饱和吸附量为44.39mg/ml湿树脂,铜的饱和吸附量为24.56mg/ml湿树脂;氰化物的吸附速率常数为k=9.30×10-4s-1,铜的吸附速率常数为k=1.39×10-3s-1;该树脂对氰化物及铜离子的吸附符合Freundlish方程;使用高浓度的NaCl溶液可以解吸树脂上负载的氰化物及金属铜,解吸率分别为85%和72%。     

一种弱碱性树脂对淋洗液中铼的静态吸附性能

铼是一种稀有高熔点金属,多伴生在钼精矿中,经氧化焙烧后,大部分铼富集在烟气淋洗液中。为了实现钼精矿焙烧淋洗液中铼的回收,研究了不同型号离子交换树脂对铼吸附性能的对比,弱碱性阴离子交换树脂ZS70吸附铼的控速步骤、饱和吸附容量以及循环使用性能,并研究了不同吸附温度、铼离子浓度、硫酸根浓度等条件下,ZS70树脂对铼的平衡吸附容量和分配比。结果表明,弱碱性阴离子交换树脂ZS70对铼有较好的吸附性能,在相同试验条件下,其对铼的吸附容量大于强碱性阴离子交换树脂201×7和D201;ZS70树脂对铼的吸附过程受内扩散控制;树脂对铼的饱和吸附容量为60.4 mg·g~(-1);平衡吸附容量随吸附温度升高而降低,随初始浓度的升高而增加;分配比随吸附温度和初始浓度的升高而降低;硫酸根含量对树脂的平衡吸附容量影响不大;经过10次循环使用,树脂的平衡吸附容量仅降低2.84%,循环使用性能良好。     

用强酸性阳离子交换树脂从不锈钢酸洗废水中富集铬

研究了用强酸性阳离子交换树脂(001×7)吸附不锈钢酸洗废水中的铬,考察了树脂的饱和吸附容量、吸附时间对树脂吸附铬的影响,分析了等温吸附平衡及负载树脂的解吸再生。结果表明:298 K温度下,001×7树脂对废水中Cr3+的饱和吸附容量为60.34 mg/g;吸附90 min可达离子交换平衡;废水中铬质量浓度为700mg/L时,树脂的平衡吸附量为90 mg/g;根据吸附动力学,初步判定吸附过程为液膜控制;用质量浓度为9g/L的硫酸钠溶液可以从负载树脂上解吸铬,铬解吸率达99%以上,解吸后的树脂可重复使用。     

201×7树脂负载Fe（CN）6^3-的解吸

文中对201×7强碱性离子交换树脂负载的铁氰化物进行了解吸研究,以解决酸洗脱树脂过程中出现的问题。采用水合肼和氯化钠混合溶液可有效解吸树脂上负载的铁氰化物;在室温条件下,解吸溶液为2％水合肼＋100g／L氯化钠时,三价铁解吸率可以达到98％以上。在试验条件下,测得解吸速率常数矗：8．88×10^-4／s,60min基本达到解吸平衡。随着温度的升高,解吸速率逐渐增大,表明解吸过程是一个吸热过程,升温有利于解吸进行,但解吸过程的表观活化能为0．625kJ／mol,表明反应速率对温度不是很敏感,解吸过程可以在室温下进行。     

用D314离子交换树脂从沉钼后液中回收钼

研究了以D314离子交换树脂从某沉钼后液中吸附回收钼。试验结果表明:D314树脂对钼的吸附效果较好,溶液pH控制在4.0左右,钼吸附率为93.40%;负载树脂用0.8g/L氨水溶液进行解吸,钼解吸率达94%。     

从高温合金电溶液中回收铼酸铵的工业试验

采用移动密实床离子交换柱吸附—固定床离子交换柱解吸—蒸发冷却结晶等工序进行高温合金电溶液中铼的高效回收工业试验。结果表明,采用移动密实床交换柱吸附—固定床离子交换柱解吸和再生,可使整个离子交换系统连续运行;采用15BVs 8%NH4SCN溶液解吸铼时,可使流出液含铼浓度降至1mg/L;采用20BVs 2mol/L H2SO4溶液使树脂再生时,再生树脂对铼吸附率仍可达99.97%,且吸附后液含铼浓度可降至0.4mg/L;采用6倍理论用量CaCl2沉钼时,钼沉淀率为99.69%;最终所得铼酸铵产品纯度达到99.99%。     

“无试剂”地浸采铀浸出液吸附树脂及淋洗剂选择试验

某砂岩型铀矿床成功采用"无试剂"地浸开采,通过室内对比试验选择吸附树脂及淋洗剂。结果表明,选用201×7型强碱性阴离子交换树脂可作为该浸出液的吸附树脂,100g/L NaNO_3+5g/L Na_2CO_3作为上述饱和树脂的淋洗剂。     

离子交换法处理氰化贫液中铜的工艺及动力学

用201×7离子交换树脂处理黄金氰化贫液的高含量铜,研究了树脂吸附铜的工艺和动力学,考察了温度、pH、液固比和时间对吸附的影响。结果表明,该树脂能有效吸附氰化贫液中的铜。温度和pH对吸附性能影响不大,降低液固比能提高吸附效果;在1.0h后吸附趋于饱和,吸附过程符合一级动力学模型。     

Sorption of Rhenium from Sulfuric Acid Solutions with Trialkylamine-Containing Impregnates

The sorption of rhenium (VII) from sulfuric acid solutions with impregnates based on macroporous polymeric carriers (copolymers of styrene with divinylbenzene, a weakly acidic cation-exchange resin), which contain technical trialkylamine (TAA), is investigated in batch conditions. Equilibrium and kinetic characteristics of sorption of rhenium with the K-TAA impregnate based on macroporous cationite having the best capacitive characteristics with respect to rhenium are found. The maximal distribution coefficient of rhenium in the K-TAA impregnate is observed during sorption from solutions with pH 2. The sorption isotherm of rhenium is described by the Langmuir equation with constant K = 29 ± 2 mL/g. Integrated kinetic curves of sorption are found by the method of a limited solution volume at various temperatures and effective diffusion coefficients of rhenium in an impregnate, which are equal to 3.8 × 10^–11 (295 K) and 1.3 × 10^–10 (308 K) m²/s, are calculated allowing to the half-transformation time. Processing the kinetic data by linearization according to equations of models of the pseudo-first, pseudo-second, internal diffusion, and Elovich showed that kinetic curves are described with the highest degree of correlation by pseudo-second-order equations with rate constants 0.00056 (295 K) and 0.00059 (308 K) g mg^–1 min^–1. The apparent activation energy of sorption of rhenium of 39 ± 2 kJ/mol is calculated according to the Arrhenius equation. The K-TAA impregnate is approved for the sorption of rhenium from the eluate formed during the desorption of rhenium from the weakly basic anion-exchange resin (Purolite A170) preliminarily saturated with rhenium from a productive leaching solution of processing products of rhenium-containing off-balance copper-sulfide ores with a complex composition.     

钼精矿焙烧烟气淋洗液中回收铼的试验研究

针对低浓度含铼淋洗液中铼的回收进行了树脂吸附和解吸试验研究。通过研究对比旧树脂和新型树脂,得出合适的吸附和解吸条件。同时通过对温度、流速、解吸浓度等因素进行研究。结果表明,随着氨水浓度升高至3%时,解吸率可升高到98.54%。同时温度越低,流速越小,越有利于铼吸附。     

柠檬酸法脱硫中硫酸根的树脂吸附研究

采用静态法研究D301R、D301G、D370和D315四种弱碱性阴离子交换树脂吸附柠檬酸法脱除SO2的解吸贫液中硫酸根的效果,分析吸附时间、柠檬酸浓度、树脂用量、pH等对硫酸根吸附量的影响,解吸时间、解吸碱液浓度对树脂解吸效果的影响,及多次吸附解吸循环再生对树脂吸附活性的影响。结果表明,D315在高浓度柠檬酸钠溶液(1.0 mol/L)中对SO42-有较好的脱除效果,当氢氧化钠浓度为1.5mol/L时,3min即可将SO42-解吸完全,在经过10轮吸附解吸循环再生后其活性下降,吸附能力降低约15%。     

Intensification of Gold Sorption by Anion Exchange Resins

Gold extraction technology based on anion exchange resins with mixed basicity, commonly used in former soviet countries, includes a complicated and expensive process of resin regeneration and gold stripping by thiocarbamide solution. Satisfactory sorption properties of weak base anion exchange resin at pH 6–8 and low cost of metal stripping by sodium hydroxide solution have aroused considerable interest in these resins as perspective means of gold extraction from cyanide pulps on a large scale. However, the possibility of industrial use of weak base anion exchange resins is hindered by their extremely low sorption activity at pH 10.5 and the formation and release of HCN in the pulp at pH 6–8.

The development of weak-based anion exchange resins which permits efficient gold sorption at pH 10.5 has already been described in literature. A special procedure for treating cyanide pulps has been devised in ?Irgiredmet”. It allows a sigificant rise of gold distribution coefficient between anion exchange resins and liquid phase.

Studies including counter-current tests of gold sorption by anion exchange resins of mixed and weak basicity from cyanide solutions and pulps treated accordingly were carried out. It was found that the gold capacity of mixed base resins has risen by 2–3 times, and the resin flowrate and reagent consumption during its regeneration and gold stripping by thiocarbamide solution have decreased proportionally. After special treatment the gold capacity of weak base resins in solutions and pulps is 3–6 times greater than in nontreated solutions and pulps, which indicated that the sorption capacity of resins is used to the full extent. Introduction of special treatment of cyanide pulp into existing technology makes possible an efficient industrial use of commercially available weak base anion exchange resins for gold recovery.     

从低品位钼铅矿中提取钼的试验研究

研究了从氧化钼矿石中回收钼,考察了NaOH质量浓度、温度、时间、液固体积质量比对钼浸出率的影响。试验结果表明:在NaOH质量浓度80g/L、温度95℃、液固体积质量比3∶1条件下浸出矿石120min,钼浸出率达80%以上;浸出液先以Na2S溶液沉铅,再以HCl溶液调节pH=8除硅,然后再用HCl溶液调节pH=2.5,用D314大孔弱碱性阴离子交换树脂吸附钼,用10%NaOH溶液在40℃下解吸钼,钼吸附率及解吸率分别达到95%和97%。