冶金工程专业稀土方向人才培养特色

作为稀土人才培养的主要基地,内蒙古科技大学和江西理工大学冶金工程专业稀土方向人才培养取得了较好的效果。根据两校稀土方向人才培养模式,从培养目标和要求、专业设置、教育培养过程和课程教学特色方面阐述了冶金工程专业稀土方向人才培养特色。     

Study on purification and application of novel precipitant for ceria-based polishing powder

Novel precipitant prepared through carbonation with MgCl2 wastewater generated from rare earth extraction separation process and low-price dolomite as raw materials was studied in this paper. The purification methods of novel precipitant by adding appropriate oxidizing agent were studied. It was found that optimal purification result could be achieved with sodium hypochlorite as iron removal reagent and the iron removal rate could reach up to 90% when the adding amount was 0.1 vol.%. During the preparation, the particle size and distribution of ceria-based polishing powder were affected obviously by the parameters such as concentration, reaction temperature and feeding rate. The results showed that ceria-based polishing powder with D50 =2.5-3.5 μm and the particle size distribution of 0.65-0.75 μm could be prepared when the concentration of CeCl3 was 0.6 mol/L, the reaction temperature was maintained at 50 °C and the feeding speed was controlled at 25 ml/min. Compared with commercial powder, the self-made polishing powder had roughly the same cutting amount, but the surface finish of polished glass was better than that of commercial polishing powder.     

浅析建筑地基的处理方法

文章针对不同地基土质情况,阐述了地基的处理方法,并以重锤夯实法为例,就地基处理中需要的机具设备、施工要点和质量检验进行了阐述。     

Study on non-saponification extraction process for rare earth separation

The purpose of this study was to overcome the disadvantages of ammonia-nitrogen wastewater pollution and high cost of sodium saponification in rare earth separation process. The study focused on the non-saponification extraction technology with magnesia. The influences of the content and particle size of magnesia, reaction time, reaction temperature, and O/A on cerium extraction rate were also discussed. The results showed that the hydrogen ions of extractant were exchanged by rare earth ions when organic extractant and rare earth solution were mixed with magnesia powder, and then the exchanged hydrogen dissolved magnesia to make the acidity of the system stable. The magnesium ions were not participated in the extraction reaction. Non-saponification extraction process of rare earth had been realized. The cerium extraction rate could reach up to 99% in single stage within the optimal reaction conditions.     

对马克思主义时代化的解读

马克思主义自诞生以来,在发展进程中跌宕起伏,经受了严重的考验和洗礼,直到今天仍具有强大的生命力和战斗力。时代化是马克思主义的理论品质要求,塑造马克思主义的时代文化,确立马克思主义表现形式和话语体系的时代化,创立与时代联系的发展理论模式,是推进马克思主义时代化的必然要求。     

优化课程体系培养服务区域特色产业创新型人才

江西理工大学冶金工程学科以区域特色有色金属产业健康发展为服务对象,坚持特色办学,不断深化教学改革,构建了"331"理论教学体系,"231"实践教学体系,"12"综合素质课程体系,建立了通识课程、学科基础课程、专业课程、实践环节和综合素质"五位一体"的人才培养模式。立足江西,面向全国,服务地方,服务行业,着力培养服务区域特色有色金属生产及利用的具有创新精神、创业意识和实干特质的高素质创新型人才。     

Effect of impurity ions on preparation of novel saponifier for rare earth extraction

Magnesium bicarbonate,prepared by the carbonation of magnesium hydroxide slurry,was used as a novel saponifier to eliminate the ammonia nitrogen pollution in the rare earth extraction separation process.The effect of impurity ions introduced by system on the carbonation reaction of magnesium hydroxide was studied in the work.The results showed that the presence of Ca2+ could lead to side reactions so as to reduce the conversion rate of magnesium hydroxide,and a small number of rare earth ions would have great influence on the carbonation reaction.What’s more,there was no influence on carbonation reaction with the low concentration of Na+or Mg2+,the conversion rate of magnesium hydroxide could reach above 96%.This paper showed a practical theory which could provide scientific guidance for the preparation of novel saponifier in rare earth extraction separation process.     

CO32-型TOMAC自碱性溶液中萃取硫代亚砷酸

针对含砷烟尘碱浸液砷分离问题,提出CO32-型TOMAC有机相萃取硫代亚砷酸的方法.以碱浸液的模拟料液为研究对象,经硫化预处理后,测定有机相饱和萃取容量并初步探索萃取机理.考察有机相组成、相比、萃取时间及萃取温度对砷萃取分离效果影响,结果表明：有机相组成为30%CO32-型TOMAC+15%仲辛醇+磺化煤油;水相料液组成为0.5 mol/L NaOH +9.69×10-2mol/L AsIII;在室温及相比为VO/VA=1/l的条件下,AsIII单级萃取率为85.3%.经4级逆流萃取,萃余液中AsIII浓度可降至1.34×10-3 mol/L以下,萃取率可达98%以上,达到了碱性溶液有效脱砷的目的.     

冶金工程专业生产实习教学改革

分析了冶金工程专业生产实习教学过程中存在的问题。以江西理工大学为例,从稳定实习指导教师队伍,加强实习基地建设,严抓生产实习教学过程和多种实习方式相结合等方面,介绍了生产实习教学改革措施。     

Fe3O4@SiO2磁性吸附剂的制备及其对Er(Ⅲ)和Ho(Ⅲ)的吸附性能

稀土资源的开采伴随着稀土离子排放,对水资源造成了严重污染。吸附法是处理水相稀土离子污染的一种高效技术,磁性吸附剂能够加速固液分离,具有较大的研究价值。本研究以FeCl₃·6H₂O、甘醇、醋酸钠、聚乙二醇(PEG2000)等为原料,采用溶剂热法在200℃的条件下制备粒径约为230 nm的Fe₃O₄磁性纳米颗粒,将其加入正硅酸乙酯中,利用氨水水解聚合,即可形成粒径约为300 nm的Fe₃O₄@SiO₂磁性吸附剂材料。此复合材料为核壳结构,包含Fe₃O₄和SiO₂两种晶型结构。SiO₂的包覆未对Fe₃O₄物相结构产生较大影响,在包覆的同时能够显现出一定的磁性性能。此复合材料对Er(Ⅲ)和Ho(Ⅲ)的最大吸附容量分别达到10.03 mg/g和5.25 mg/g。