Preparation of Perovskite-Type Oxides La_(1-x)Sr_xFe_(1-y)Co_yO_3 Using EDTA Sol-Gel Method

Two series of perovskite-type oxides with composition (La_(1-x))Sr_xFeO_3(x≤0.8)and La_(1-x)Sr_xFe_(1-y)Co_yO_3(x=0.2; y=0.2, 0.4)powder productions were synthesized by EDTA complexing sol-gel method. The products were characterized by XRD, TEM, SEM, BET method(N_2 adsorption)and laser granularity analysis for different synthesis conditions to obtain the optimum conditions for the preparation process. Single-phased, uniform perovskite-type oxides with small particle size were obtained by EDTA sol-gel process with high stability and repeatability, and the process temperature is much lower than that of solid state reaction method.

照相级乙二胺四乙酸铁铵溶液的制备

介绍了照相级乙二胺四乙酸铁铵溶液的制备方法。解决了产品易结晶 ,易沉淀的问题 ,提高了产品浓度。用该方法制备的乙二胺四乙酸铁铵溶液 ,总活性铁含量可达 6 5%以上。

铜精矿中铅元素分析工作曲线的建立及在X荧光分析中的应用

在粗铜冶炼过程中,铜精矿作为主要原料,其中铅含量的多少直接影响粗铜产品的质量。因此,铜精矿中铅元素的分析就显得尤为重要。在冶炼工艺配料过程中,如何配比含铅品位不同的铜精矿达到不影响粗铜产品的质量是非常重要的。X荧光分析方法成为目前广泛应用标准方法。该方法的特点是准确、快速、简便,完全能够满足生产的需要。而传统的铅元素的化验方法是EDTA容量法,这种方法虽然准确,但是易形成PbSO4沉淀颗粒,导致分析速度慢,需要静置很长时间才能得到理想的检测结果,消耗时间、材料及人力。介绍了通过人为配制样品的方法,并以传统铅分析方法为基础对样品进行准确分析,以化验数据为依据,将正确的化学检验结果输入X荧光分析仪,制成铅元素的工作曲线,可满足生产检测需要,为生产提供及时准确的检测数据。