高硫铝土矿中黄铁矿的细菌氧化试验研究

从高硫煤矿中分离到3种氧化亚铁硫杆菌,用它们对重庆某高硫铝土矿石进行生物氧化浸出脱硫试验,在合适的工艺条件下,脱硫率均超过74%,其中SX-1#菌的脱硫率达到83.57%,并使矿石的硫含量由生物氧化浸出前的3.83%降低到0.69%,达到拜耳法生产氧化铝工艺对矿石硫含量的要求。试验结果表明,生物氧化是高硫铝土矿石的高效脱硫技术。     

铝土矿浸出液中铝、铁的回收利用

以铝土矿浸出液为原料,通过化学沉淀法、碱溶、碳分、煅烧等工艺得到氧化铁、氧化铝粉体。本实验考察了沉淀、碱溶、碳分过程中溶液终点pH值、反应温度、反应时间等条件对反应率的影响,得到优化工艺条件。并采用化学成分分析、XRD、SEM对产品进行表征。结果表明：沉淀阶段,在最终pH值6.5,反应温度80°C,反应时间90 min条件下铝的沉淀率可达99%,铁的沉淀率达97%。碱溶阶段,在溶液终点pH值14,碱溶温度80°C,碱溶时间30 min的条件下,铝溶出率达到99.42%,铁去除率到99.63%。在碳分阶段,在溶液终点pH值9.0,碳分温度40°C,CO₂流速选择6 mL/min的条件下,铝沉淀率达到98.69%。得到的产品粉体晶型良好,颗粒均匀,符合国家标准。     

我国高铝矾土均化料的技术进步

介绍了我国高铝矾土加工特点,提出了我国高铝矾土的发展方向应该是均化与提纯,重点介绍了矾土基均化料的工艺路线和技术发展,并对进一步产业化提出建议。     

铝土矿碱液矿浆电溶出机理研究

铝土矿碱液浆通过电电溶出提取氧化铝是一种新的工艺,本文研究了在交变电场作用下,铝土矿泉同机理;并考察了温度、配料分子比、电极电流密度等地氧化铝溶出率的影响。     

贵州省道真县大塘铝土矿矿石特征

本次对大塘铝土矿研究区进行矿石类型划分,对其矿物、化学成分等进行研究,得出矿石特征及成因。矿石矿物以铝矿物为主,隐晶、豆状、粒屑结构等,块状构造,其主要化学成分为Al2O3、SiO2、Fe2O3、TS、TiO2。铝土矿石赋存层位为大竹园组,属Ⅳ-Ⅴ级品,产于遭受长期风化剥蚀的古陆边缘,为古风化壳沉积型矿床。     

Beneficiation and upgrading of coarse sized low-grade bauxite using a dry-based fluidized bed separator

Beneficiation and upgrading of low-grade bauxite is important to the subsequent extraction of Aluminum metal using Bayer process. The mineralogical characterization of diaspore bauxite sample used in this work was performed using various analysis approaches. The results indicated that the major components of raw sample were diaspore and kaolinite. The bauxite samples had high Al₂O₃ contents with low Al/Si ratios. A dry-based fluidized bed separator with FeSi powder as dense medium was used to beneficiate coarse sized bauxite. The basic fluidization tests suggested that −0.18 + 0.125 mm FeSi powder was appropriate for the fluidization stability, thus utilized as the dense medium for separation. The beneficiation experiments of various sized bauxite samples were investigated under various operational factors of separating time, static bed heights, and operational gas velocities. The upgrading performance of coarse sized bauxite indicated that the satisfied grade of concentrate could be obtained with a reasonable recovery of concentrate. Al/Si ratios were improved to 3.19, 4.53, and 3.66 for the bauxite samples with size fractions of −13 + 6 mm, −18 + 13 mm, and −25 + 18 mm, respectively. This work provided an alternative efficient method for the pretreatment of low-grade bauxite via discharging coarse waste gangue.     

β-SiAlON添加量对矾土基浇注料高温力学性能的影响

研究了加入 β SiAlON对矾土基超低水泥浇注料高温力学性能的影响。结果表明 :加入 β SiAlON能明显提高浇注料试样在 1 30 0℃下的热态强度 ,同时其抗热震性也得到显著改善。产生这些结果的原因是针状和纤维状的 β SiAlON细晶穿插或填充在基质的刚玉骨架结构中 ,起着强化和增韧作用 ,有利于提高试样的高温强度和抗热震性     

中国耐火原料的新近发展

介绍了过去几年中国几种主要耐火原料,如矾土基原料(包括电熔刚玉、尖晶石、莫来石)、镁质原料(包括大结晶98电熔镁砂、高铁高钙镁砂、电熔或烧结镁铬砂)和非氧化物材料(包括氮化硅铁、氮化硅)的最新发展,同时讨论了非氧化物结合的新型材料在未来几年的发展趋势.     

矾土基电熔锆刚玉和锆莫来石合成料的制备、性能与结构

研究了以高铝钒土为熟料和锆英砂为原料、采用电熔工艺法制备的矾土基电熔锆刚玉和锆莫来石合成料的理化性能、物相组成和显微结构,并用这些合成料制备了Al2O3 -ZrO2 -C试样,检测其常温物理性能、高温抗折强度和抗热震性;同时还与氧化铝基电熔锆刚玉和锆莫来石合成料进行了相应性能的比较。结果表明,矾土基电熔合成料的化学矿物组成、性能和显微结构均与氧化铝基电熔锆刚玉和锆莫来石合成料的相似,而且用其生产的Al2O3 -ZrO2 -C制品的性能也达到了用氧化铝基电熔合成料所能达到的水平,可用于实际生产。