共查询到19条相似文献,搜索用时 46 毫秒
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通过对氨-硫酸铵法生产活性氧化锌工业化的实验研究,对工艺的经济性、环保性、工业化可行性进行了分析,发现此工艺经济环保性较好,得到了一条工业化生产活性氧化锌的新工艺路线,通过此工艺可得活性氧化锌。 相似文献
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河南心连心化肥有限公司的氨一硫酸铵法烟气脱硫工艺自2007年8月投运以来,经过不断地改造和优化,目前运行已基本正常。该工艺在设计上有一定的先进性,但在实践过程中还是需要进行局部改造和操作优化。该系统对SO2和粉尘的处理可以达到国家排放标准,所副产的硫酸铵产品也能符合国标要求并用于生产复合肥,实现了烟气的达标排放和脱硫副产品的再利用, 相似文献
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研究采用硫酸铵-氨水溶解氧化锌试样,EDTA滴定法测定氧化锌含量.结果表明,用200 g·L<'-1>硫酸铵溶液10 mL,5 mL氨水溶解分析试样,搅拌5 min后试样中氧化锌溶解完全,金属锌、氧化铁等杂质不溶,氧化锌的测定不受这些杂质的干扰,测定结果与传统溶样方法的测定结果相吻合,相对标准偏差小于0.1%. 相似文献
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烟气脱硫(FGD)是目前控制SO_2污染的主要技术。它系用液体吸收剂或固体吸附剂吸收或吸附SO_2。尽管处理这种量大而SO_2浓度低的烟气是不经济的,但由于FGD比其他SO_2控制技术简单,因此在今后数十年中仍将得到广泛的应用。 FGD的方法很多。本文仅就氨-硫 相似文献
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为充分发挥氨法脱硫系统自身优势,避免石灰石-石膏法废水外排造成污染环境,文中采用一期氨法脱硫预洗塔母液和料液槽母液作为溶剂,二期石灰石-石膏法各类脱硫废水作为溶质,深入研究添加各类废水对硫酸铵结晶及其晶体影响。研究表明:向一期预洗塔、料液槽硫酸铵母液中添加二期各类石灰石-石膏法废水,均可使硫酸铵结晶量明显增加,尤其添加脱硫塔浆液;添加各类废水后预洗塔母液结晶的硫酸铵晶体平均粒径均比未添加废水的晶体大,添加各类废水40.0 mL之后料液槽母液的硫酸铵结晶量增加缓慢;晶体形貌主要受不同废水元素所致。100.0 mL预洗塔硫酸铵母液较优的脱硫塔浆液添加体积为40.0 mL,100.0 mL料液槽硫酸铵母液较优的脱硫塔浆液添加体积为50.0 mL。相关研究成果可为烧结烟气石灰石-石膏法废水循环利用提供新思路。 相似文献
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Sintering studies have been conducted with single crystal spheres of zinc oxide in air at total pressures of 10−3 to 1.0 atm over the range 1050° to 1250°C. Quantitative observations were made on the rate of growth of a neck between the spheres. No change in the distance between the geometrical centers of the spheres was observed. An analysis of the kinetic data shows that sintering was predominantly achieved by distillation through the surrounding gas phase. At 1150° the rate of welding was inversely influenced by the total pressure when the latter was changed from 0.003 to 0.75 atm. No conclusion could be reached on the effect of the oxygen partial pressure at constant total pressure. A brief summary of the various sintering mechanisms of zinc oxide from 700° to 1250°C is presented. 相似文献
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Sintering of Zinc Oxide 总被引:1,自引:0,他引:1
T. J. GRAY 《Journal of the American Ceramic Society》1954,37(11):534-538
The fundamental processes involved in the sintering of ionic solids are highly complex. Of particular significance are the initial stages of sintering during which surface effects are of prime importance. The sintering of zinc oxide has been studied by the method of changes in surface area at temperatures from 300° to 1000°C. and with varying oxygen pressures (from 10-5 to 760 mm. of Hg). It has been demonstrated that significant sintering occurs at temperatures far below the Tammann temperature. It also has been shown that under specific conditions a very high defect concentration may exist in the surface of the material and that this is closely related to the phenomenon of sintering. Correlation has been made with an electron-microscope investigation. Detailed X-ray studies on single-crystal specimens of zinc oxide have shown that interstitial zinc constitutes the defects. Activation energies have been deduced for the sintering process which suggest that the rate-controlling step is diffusion in the surface zone in the low-temperature region which changes to lattice or complex diffusion and viscous-flow mechanisms about the Tammann temperature. 相似文献
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本文报道了用菱锌矿作原料,制备硫酸锌的工艺条件。该工艺除杂效果好,产品质量符合国家标准。锌的回收率高,操作方便,生产成本低,且对原料的适应性强 相似文献
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采用浮选———酸浸湿法工艺处理锌尾矿,研究了浮选药剂的最佳配比。以湿法处理浮选得到的锌精矿(βzn=36.5%,εzn=56.7%)。可制得符合国标GB8251-87的饲料级ZnSO4·7H2O。 相似文献
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《分离科学与技术》2012,47(15):2405-2414
Physical separation and hydrometallurgical purification techniques, such as scrubbing, magnetic separation, leaching, and precipitation were used to convert crude zinc oxide into high purity zinc powder. Scrubbing was used to remove the soluble chloride on the crude zinc oxide surface. The solubility of metal oxides contained in the crude zinc oxide was simulated by DIASTAB software to determine the pH ranges for metals precipitation. Leaching under various conditions was conducted to determine optimum operating parameters. From the solubility diagram, the titration ends in the range of pH 5.78~6.1 and high purity (92.2%) zinc powder can be obtained with 82.04% recovery. 相似文献