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膨润土中蒙脱石含量对湿球团爆裂温度、抗压强度、落下强度以及对干球团抗压强度和耐磨强度的提高具有高度显著影响,而碱性系效和PH值无显著影响。2小时吸水率和24小时吸水率对未焙烧球团的抗压、落下及耐磨强度的提高也有高度显著影响,但两者作用相反。 相似文献
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钠基土膨润土粘性大,配加量小,使用钠基土是球团减少膨润土消耗的有效措施之一.针对济钢球团粘结剂消耗较高的情况,在实验室对8个钠基土样进行了造球试验和指标测试,对比分析钠基土应用效果,并进行综合评估.试验表明,在保证生球质量下,钠基土与钙基土的替代比达到1∶1.6左右,能有效降低球团膨润土用量. 相似文献
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膨润土质量检验的简易方法 总被引:1,自引:0,他引:1
我国生产球团矿,大都配加膨润土。目前尚无国家标准检验方法和统一的质量标准,作者借鉴美国通用的方法,经过实验研究,提出以“吸水率”作为鉴定膨润土的质量指标,并推荐出一种简易的检验方法。 相似文献
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为鞍钢即将投产的200万t 球团厂选择合适的粘结剂,作者对品种选择及最佳配比进行了试验研究,从而得出这样结论:①在鞍山的原料条件下,东北地区的几种膨润土作为粘结剂时,以刘房子膨润土为最佳.其配比为0.8%时,生球落下强度达5.5次/个球,抗压强度达14N/个球,千球抗压强度为41.2N/个球,成品球团的抗压强度达到2625.3N/个球。配比增至1.0%和1.3%时效果更好;②凌源膨润土和黑山人工钠化膨润土的使用效果也较好。二者配比在1.0%时,生球、干球、成品球的强度指标和生球爆裂强度均能满足带式球团工艺要求;③用自产精矿代替大浮精矿配加刘房子膨润土所造生球各项指标若要满足工艺要求,粘结剂的配比只能在1.0~1.3%。 相似文献
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膨润土去除铅的研究 总被引:1,自引:0,他引:1
赤峰高纯膨润土,蒙脱石的含量较高,是一种具有的药用价值的钙基膨润土,但其铅量高达49.6 ppm,超过国家和出口标准。因此,如何降低该膨润土的含铅量至关重要。以柠檬酸为络合剂,对钙基膨润土中的铅进行去除。考察了络合剂种类、络合剂用量、反应温度、反应时间和料浆浓度等因素对膨润土除铅效果的影响。结果表明:最佳柠檬酸用量为50g/L,反应温度150℃,反应时间300 min,料浆浓度6%,得到的膨润土中固体铅含量9.15ppm,达到了((10 ppm)的国家标准,可作为药用膨润土的原料。因此,研究除去该钙基膨润土中的铅,使其达到药用膨润土的要求,对充分利用和开发该膨润土具有重要意义。 相似文献
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近年来马钢一烧球团生产的技术进步及效果 总被引:1,自引:2,他引:1
马钢一烧竖炉球团系统投产后,通过设备改造和技术创新,包括优化配料方案、增设润磨工艺、探索热工参数,设计新型烘干炉、改造竖炉炉型等,并对生产设备采用计算机系统控制及数据信息自动采集处理,竖炉作业率、利用系数,球团矿产量、合格率,膨润土单耗等多项指标达全国先进水平。 相似文献
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目前球团粘结剂主要成分是膨润土,但膨润土的使用会降低球团品位,为此,人们一直致力于寻求优质膨润土或开发新型的粘结剂。通过分析新型球团粘结剂A的基本物化性质、小饼试样的工艺性能得到预热与焙烧的最佳条件,在最佳条件下进行焙烧验证试验。试验使用优质钠基膨润土做基准试验,与新型粘结剂A比较。结果表明:在相同条件下,配加1%的新型粘结剂A的球团矿连晶更好,强度更高,可以完全替代膨润土。且配加新型粘结剂A的球团矿在较低温度下预热和焙烧就能达到工艺生产要求,有助于节能。使用新型球团粘结剂A代替膨润土应用于球团生产,具有一定应用前景。 相似文献
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Theoretical Equations on Hydraulic Conductivities of Bentonite-Based Buffer and Backfill for Underground Disposal of Radioactive Wastes 总被引:1,自引:0,他引:1
Hideo Komine 《Canadian Metallurgical Quarterly》2008,134(4):497-508
Compacted bentonite and sand-bentonite mixtures are sought as buffer and backfill materials for high-level radioactive waste disposal facilities because they have very low permeability. To establish specifications such as the dry density and sand-bentonite mass ratio for buffer and backfill materials, we must quantitatively evaluate a material’s hydraulic conductivities. This study presents theoretical new equations for evaluating the hydraulic conductivity of compacted bentonites and sand-bentonite mixtures. New equations are proposed for evaluating the flow velocity of interlayer water between two montmorillonite parallel-plate layers considering the swelling behaviors of montmorillonite. Furthermore, a prediction method for hydraulic conductivity of compacted bentonite and sand-bentonite mixtures is presented by combining new equations with previous equations for evaluating swelling behavior of montmorillonite in bentonite. The applicability of this method is clarified by comparing predicted results with experimental data reported by previous research on hydraulic conductivities of compacted bentonites and sand-bentonite mixtures. 相似文献
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济钢在球团膨润土中配加碱性物料,采用雷蒙磨细磨,试验成功了低SiO2含量、造球粘结性能良好的碱性复合球用用粘结剂,取代以SiO2含量为主的膨润土类粘结剂。工业试验结果表明,配加该碱性复合粘结剂,提高了球团矿品位,改善了球团矿冶金性能,经济效益显著。 相似文献
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探讨粉煤灰、活性炭和膨润土等吸附剂对硫酸锰溶液中残余少量有机物的吸附效果,并以膨润土为吸附剂进行单因素试验,考察了膨润土用量、吸附时间、pH和温度对吸附效果的影响。结果表明,使用膨润土吸附剂,在溶液pH为7.0,25℃,吸附时间30min,膨润土用量10.0g的条件下,硫酸锰溶液的COD去除率可达32.4%;改性膨润土较未改性原土脱除溶液中有机物的效果更好,且酸化改性膨润土优于热化改性膨润土,COD去除率达到40.8%。 相似文献
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Bentonite is currently planned for use as a buffer and backfill material for repositories of high-level nuclear waste because these materials must have swelling characteristics to seal the waste. However, it is necessary to choose the appropriate bentonite from among many kinds of bentonite in the design of buffer and backfill materials. To do this, the writers have proposed a new prediction method for swelling characteristics of bentonite-based buffer material. This prediction method comprises some equations that were previously developed for repulsive and attractive forces between two montmorillonite layers; others included in the method are the writers’ previously proposed equations for (1) the swelling volumetric strain of montmorillonite (Komine and Ogata 1999), and (2) the influence of pore water chemistry and specific surface of bentonite (Komine and Ogata 1996a). However, the applicability of this prediction method to swelling characteristics of some bentonites remains unclarified. This study clarifies the applicability of the prediction method by comparing predicted results with experimental data for five kinds of bentonite produced in Japan and the United States. 相似文献