共查询到19条相似文献,搜索用时 62 毫秒
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研究了以炼铅厂含锌烟灰为原料,经盐酸浸取、高锰酸钾氧化、锌粉置换制备氯化锌溶液的工艺。以锌的浸出率最高,杂质铅的浸出率最低,铁、锰、铅、镉、铜脱除最彻底为目标,实验得出最佳的酸浸和净化条件:40 g次氧化锌、71 mL浓盐酸、130 mL水在30 ℃下浸取50 min后,过滤,洗涤滤渣,滤液定容为250 mL,取200 mL滤液,滤液中加高锰酸钾0.013 6 g,10 ℃下氧化2 h后过滤,取200 mL二次滤液向其中加锌粉0.12 g,40 ℃下反应50 min后过滤,得浓度为1.63 mol/L的氯化锌溶液。在上述工艺条件下,锌的浸出率为94.2%,氯化锌溶液中杂质离子含量满足HG/T 2323-2012《工业氯化锌》中优等品的要求,可用来生产符合GB/T 19589-2004《纳米氧化锌》规定的Ⅰ类纳米氧化锌。 相似文献
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研究了以炼铅厂铅锌烟灰为原料,采用盐酸浸取并以高锰酸钾氧化铁锰、锌粉置换镉铅铜两步法生产氯化锌的新方法。以锌浸出率最高、铅浸出率最低、铁锰镉铅铜除杂最彻底为考察目标,通过实验找到最佳工艺条件:40 g铅锌烟灰在由71 m L浓盐酸和130 m L水配制的混酸中在30℃条件下浸取50 min,然后加入高锰酸钾0.017 g在10℃条件下继续反应2 h,过滤后的滤液中加入锌粉0.15 g在40℃条件下反应50 min,过滤得到浓度为1.65 mol/L的氯化锌溶液。在上述工艺条件下锌的浸出率为95.4%。用制备的氯化锌溶液生产氧化锌,杂质含量满足GB/T 19589—2004《纳米氧化锌》一级品要求。 相似文献
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喷雾分解法制备高活性氧化锌 总被引:2,自引:0,他引:2
研究了用喷雾分解、干燥法由低品位氧化锌制备活性氧化锌的工艺。实验结果表明,低品位氧化锌矿经碳酸氢铵、氨水与水的质量比5:8:14的浸取液浸取,浸取率为94.67%。浸取液中的氧化锌含量可达23.3%(质量分数),用锌粉除杂净化,过滤除去杂质。滤液在喷雾干燥塔430oC的入口温度下喷雾热分解,再经过400℃下的流化床处理9min,可得到含量为99.5%z(质量分数)高活性的氧化锌。其吸碘值为87.96mg/g,活性显著高于蒸氨煅烧法所得的氧化锌,是一种新的高活性氧化锌的制备方法。 相似文献
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以酸浸取锌矿或次氯化锌,采用程序控温多次加入活性锌粉的工艺成功地在工业一水硫酸锌2000t/a生产线上生产出达到日本、香港之要求的饲料级一水硫酸锌。产品同时符合美国食用化学法典之规定。主要杂质砷、铅、镉均低于0.0003%。与传统工艺相比,浸取率提高到96%以上,浸出时间缩短,沉降速度加快,杂质去除率高,净化工艺步骤减少时间缩短,生产过程中废水排放量减少。该工艺普遍适用于生产各种级别的一水和七水硫 相似文献
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从铜镉渣中提取海绵镉的研究 总被引:1,自引:0,他引:1
本文研究了用硫酸浸取铜镉渣,使锌、镉进入溶液,铜留在残渣中。浸取液用锌粉置换,得到的海绵镉中镉含量达69.6%,镉回收率为86.5%,锌全部回收。硫酸锌溶液返回锌制品生产系统,达到充分利用资源,消除环境污染的目的。最佳浸取条件为,硫酸用量为理论量的130~140%,粒度~120目,温度80~90℃,固:液为1:6,软锰矿用量为铜镉渣重量的1%,时间10~12小时,最佳置换条件为,溶液的pH值为4,温度50°,锌粉用量为理论量的122%,时间2小时,镉浓度为16.10克/升。 相似文献
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以含锶废渣为原料,经浸取、净化、合成等步骤制备高纯碳酸锶产品.通过实验确定了最佳制备条件.浸取的条件:温度为80℃、时间为4 h、调节溶液pH≈3;净化的条件:反应温度为95℃、反应时间为3 h、调节溶液pH≈11:合成的条件:反应温度为60℃、反应时间为2 h、碳铵量过量20%为宜.实验制备的SrCO3产品纯度99.2%,达到了要求. 相似文献
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用pH值为4的锌渣提取液经高锰酸钾氧化除铁,用氯化钡沉淀除硫酸根,再用锌粉沉积除重金属后蒸发结晶,不但可以得到工业级无水氯化锌,而且可以得到电池级无水氯化锌。工艺简单,成本低廉,经济效益较高。 相似文献
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室温下采用氨浸出锌灰制得碱式碳酸锌,再经煅烧制得超细氧化锌。研究了在合成碱式碳酸锌过程中表面活性剂对碱式碳酸锌和氧化锌颗粒尺寸与形貌的影响。结果表明,聚乙二醇(PEG20000)和聚乙烯吡咯烷酮(PVP-K30)这两种表面活性剂对颗粒的分散效果最好,制得的碱式碳酸锌颗粒为无定形片状且分散均匀,平均粒径为1 μm,煅烧后的氧化锌颗粒为六方晶系纤锌矿结构,粒径约为0.7 μm。添加PVP-K30比添加PEG20000的碱式碳酸锌热分解温度高。添加PEG和PVP的碱式碳酸锌反应活化能分别为139.9 kJ/mol和146.8 kJ/mol。 相似文献
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用锌渣制备高纯氧化锌 总被引:7,自引:0,他引:7
介绍了利用锌渣为原料生产高纯氧化锌的方法。采用黄铁矾法除去大部分铁,通过控制pH值进一步除铁,用锌粉或锌屑还原除去重金属,用氨水为沉淀剂,最终可使氧化锌的含量达99.86%以上。 相似文献
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Field experiments with wheat were conducted for two years on flood plain alluvial soils to study the effectiveness of soil application of zinc sulphate and zinc oxide at 0, 15, 45, 60, 75 and 90 days after sowing. Yield and zinc uptake of wheat increased significantly with the application of zinc. Delaying the application of both zinc sulphate and zinc oxide up to 45 days of sowing did not adversly affect the zinc nutrition of wheat. However, delaying the application for 75 or 90 days after sowing eliminated the response. Zinc sulphate, when applied within 60 days of sowing performed better than zinc oxide. In a laboratory study, zinc sulphate maintained a higher level of zinc in the soil solution than zinc oxide at least over a 3-week period. 相似文献
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Electrowinning of zinc from zinc chloride solutions, acidified by HCl, was conducted in a cation exchange membrane cell. The current efficiency was correlated with the deposit morphology. The deposits having lesser surface defects, which act as active sites for hydrogen adsorption, exhibited higher current efficiency. The (1 1 0) preferred texture was observed on the deposits grown in high acid solution containing gelatin. High temperature (40 ºC) and high current density decreased the current efficiency and the preferred texture. 相似文献
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R. Renuka L. Srinivasan S. Ramamurthy A. Veluchamy N. Venkatakrishnan 《Journal of Applied Electrochemistry》2001,31(6):655-661
The behaviour of zinc and zinc oxide in 5.3 M KOH in the presence of alkaline earth oxides, SnO, Ni(OH)2 and Co(OH)2 was examined by cyclic voltammetry. The influence of the alkaline earth oxides was compared with additives of established effects (Bi2O3, LiOH, Na2CO3 and CdO). The alkaline earth oxide each exhibits a distinct behaviour towards zincate. Whereas, a single process of interaction with zincate was shown by CaO; two modes of reaction were obtained with SrO and BaO. Solid solution formation was noticed with BeO and MgO. The other additives forming solid solution with ZnO were CdO, SnO. The ionic sizes of Ni(OH)2 and Co(OH)2 allow solid solution formation with Zn(OH)2. Both Bi2O3 and Na2CO3 enter into complexation with zincate. LiOH forms two distinct zincates, of which one is an oxo zincate leaching the `hydroxyl' functionality. Cyclic voltammetry revealed the deposition of the oxide/hydroxide additives as metal prior to the onset of zinc deposition and the potential range for this additive metal deposition is almost the same for different additives (SnO, CdO, Ni(OH)2). The beneficial action of these additives to zinc alkaline cells is associated with a substrate effect. The implication of this electrocatalytic deposition of metals on a zinc oxide electrode is also discussed. 相似文献