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包钢选矿厂尾矿中含有大量可以再利用的稀土、铌、铁等有价元素.开发利用尾矿,即可综合回收这一部分宝贵资源,使尾矿变废为宝,又可减少尾矿对周围环境造成的严重污染,因而引起了科学家们的广泛关注.本丈介绍了从包钢选矿厂尾矿中提取有价元素稀土、铌、铁等的方法及其研究进展,并对碳热氯化法提取包钢选矿厂尾矿中有价元素工艺的可行性进行了探讨. 相似文献
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研究了包钢选矿厂尾矿经稀硫酸-稀盐酸溶解、溶解液在乙醇作用下结晶共提取稀土与铁的新工艺. 实验考察了稀硫酸溶解稀土尾矿时,溶解温度、硫酸浓度等对稀土和铁溶解率的影响. 最佳条件下稀硫酸溶解液中稀土溶解率低于8%,铁的溶解率大于94%. Fe3+经工业铁屑还原为Fe2+,在室温下用乙醇提取FeSO4,FeSO4纯度为98.21%,尾矿中铁回收率达89.51%. 稀盐酸不溶物中稀土氧化物(REO)品位为43.60%,稀土回收率达78.82%,新工艺实现了稀土和铁资源的提取分离. 相似文献
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在O_2/CO_2气氛下,采用立管炉研究添加稀土尾矿对烟煤燃烧过程中NO_x释放的影响,分别研究温度、稀土尾矿添加量及粒径对脱硝效率的影响.结果表明:0.1g的烟煤添加稀土尾矿后,当反应温度为1 000℃,稀土尾矿添加量为0.05g,粒径为48μm~58μm时,稀土尾矿的脱硝效率是最高的,最大脱硝率占0.1g烟煤产生的NO_x总量的60%.稀土尾矿降低NO_x主要由异相催化还原引起,通过对比分析尾矿反应前后的XRD发现,稀土尾矿形成的固溶体体现了稀土尾矿中物质的协同作用. 相似文献
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高岭土尾砂综合利用工艺研究 总被引:1,自引:0,他引:1
高岭土是制瓷工业的主要原料,在开采用加工过程中生产大量尾砂,污染环境且导致资源浪费,通过本试验研究,从尾砂中分选出工业上可综合利用的长石,云母等系列产品,并实现了无尾矿选矿新工艺。 相似文献
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把浮选柱应用到磷矿选矿中,且利用先进的浮选柱对一次选矿中的细粒尾矿开展深度加工,使丢弃的尾矿中的磷资源得到充分回收,与原有全槽式浮选机组装置相比较,尾矿中的P2O5含量至少降低了2%,提高磷收率,增加了经济效益。 相似文献
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本实验以稀土尾矿、钾长石、石灰石、石英、高岭土等为主要原料来制备低成本的陶瓷无光釉,研究稀土尾矿加入对钙无光、镁无光釉面效果的影响,从而探究出稀土尾矿在无光釉中的应用状况。实验结果表明:以配方组成36.6wt%钾长石、15.5wt%石英、11wt%方解石、28.6wt%滑石、8.3wt%高岭土、外加15wt%稀土尾矿在... 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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The miscibility of various amorphous polybutadienes with mixed microstructures of 1,4 addition units (cis, 1,4 and trans 1,4) and 1,2 addition units have been investigated. The studies here involved optical transparency, differential scanning calorimetry, and small angle light scattering. It was found that a 90 percent (cis) 1, 4 addition polybutadiene was immiscible with high (91 percent) 1,2 addition polybutadiene. Reduction of the 1,2 content to 71 percent induced an upper critical solution temperature (UCST) with the cis 1,4 polymer. Polybutadienes with 50 percent and 10 percent 1,2 contents were miscible above the crystalline melting temperature of the cis 1,4 polybutadiene. Immiscibility of the 91 percent 1,2 addition polymer was also found with a 10 percent 1,2 polybutadiene. The latter polymer also exhibits an UCST with the 71 percent 1,2 polymer. The results are used to interpret the characteristics of blends of polybutadienes of varying microstructure. 相似文献
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以F类粉煤灰为例,详细介绍了测定粉煤灰中烧失量的步骤、计算数学模型、影响测量不确定度的因素以及各项测量不确定度分量评定,人员、设备、材料、方法、环境都是影响测量不确定的因素。 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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