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.     

丙二酸钠搅洗去除稀土富集物中硫酸根

在离子型稀土浸出液氧化钙沉淀过程中,硫酸根会参与反应产生碱式硫酸稀土,使所得混合稀土氧化物中硫酸根含量过高。针对这一问题,本文基于竞争配位除硫的思路提出采用丙二酸钠对氧化钙沉淀富集物进行搅洗以除去其中的硫酸根,在搅洗反应温度45℃,搅洗时间10 min,丙二酸钠溶液浓度0.10mol/L、体积30 mL的条件下,获得了稀土纯度为91.36%、硫酸根含量为3.02%(质量分数)的混合稀土氧化物。通过对反应过程的质量衡算和TG-DSC、XRD、FI-IR等测试表征,确定了在搅洗过程中丙二酸根与碱式硫酸稀土中的硫酸根以摩尔比1:1竞争配位。丙二酸根的引入可有效降低硫酸根含量,但是其搅洗循环效果有待进一步提高。     

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。     

利用区域文化资源优势强化立德树人

发挥区域文化资源优势,以红色文化融入理想信念教育,以客家文化厚植家国情怀,以阳明文化培育知行合一品格,以矿冶文化培养艰苦奋斗精神。将红色文化、客家文化、阳明文化、矿冶文化融入高校思想政治教育,探索高校立德树人效果。     

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.     

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.     

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。     

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.     

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。