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at second stage with zinc powder and arsenic trioxide. In this research, a new approach is described for determination of effective parameters and optimization of zinc electrolyte hot purification process... size distributions (S1-S5), and 0.1-0.5 g/L (C) for arsenic trioxide mass concentration. Optimum conditions for hot purification obtained in this work are T4 (85 °C), t4=75 min, M4=3.5 g/L, S4 (Serie 4......
Preparation of nanometer δ- and β-bismuth trioxide by vacuum vapor-phase oxidation HU Han-xiang(胡汉祥)1, 2, QIU Ke-qiang(丘克强)1, XU Guo-fu(徐国富)3 1. School of Chemistry and Chemical Engineering...; Key words: δ- bismuth trioxide; β-bismuth trioxide; vacuum vapor-phase oxidation......
硅钼蓝分光光度法测定三氧化二砷中二氧化硅谢辉1,赖心1,黄葡英1(1.广东省广州市广州有色金属研究院分析测试中心)摘 要:研究了在三氧化二砷中加入盐酸,加热除砷,所得残渣用氢氧化钠溶解,硝酸酸化后,以钼酸铵为显色剂,在pH 0.9条件下,硅与钼酸盐形成硅钼黄络合物,用硫酸提高酸度,以抗坏血酸为还原剂,使硅形成稳定的硅钼蓝络合物,采用分光光度法测定其中的二氧化硅含量.硅钼蓝络合物最大吸收波长位于813nm处.本法相对标准偏差(RSD)为1.6%~1.9%(n=6),测定结果与ICP-AES法的结果相一致.
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熔融制样-X射线荧光光谱法测定三氧化钼中7种组分王宝玲1,李小莉2,田文辉1(1.陕西省渭南市华县金堆城质量计量监测中心2.天津地质矿产研究所,天津 300170)摘 要:采用无水四硼酸锂熔融制样,建立了用波长色散X射线荧光光谱(XRF)法测定三氧化钼中MoO3,Pb,Cu,SiO2,CaO,Fe2O3,K2O 7种组分的方法.以Mo为主要分析元素分别对仪器参数,分析谱线,曲线拟合进行了研究,并详细讨论了熔融法制样条件中熔剂的选择,脱模剂的选择,熔融温度和熔融时间的确定.采用经过多次化学分析的样品作为标准样品绘......
Reduction characteristics of molybdenum trioxide with aluminum and siliconHang-Yu Zhu1,Rong Gao2,Wu-Tao Jin2,Long-Wu Qiu2,Zheng-Liang Xue11. State Key Laboratory of Refractories and Metallurgy, Wuhan... products of molybdenum trioxide with aluminum and silicon at various temperatures were detected by X-ray diffraction(XRD). Results show that molybdenum trioxide is reduced by aluminum or silicon step......
, the sodium arsenate solution could be further reduced by sulfur dioxide (SO2) gas to arsenite, at a reduction yield of 92% under the suitable conditions. Arsenic trioxide with regular octahedron shape could..., and arsenic trioxide preparation, provides an attractive approach to realize the resource utilization of arsenic-containing cobalt and nickel slag. Key words: arsenic-containing cobalt and nickel......
砷酸铜;沉淀;二氧化硫;还原;三氧化二砷 中图分类号:X703 文献标识码:A 文章编号:1672-7207(2009)01-0048-07 Arsenic trioxide made...: Preparation arsenic trioxide from As-containing wastewater by precipitation-reduction method was studied. Sodium hydroxide was added in the As-containing wastewater to adjust pH value to 6......
; 文章编号:1672-7207(2008)06-1157-07 Preparation of arsenic trioxide from arsenic sulfide slag ZHENG Ya-jie, LIU Wan-yu, BAI Meng, ZHANG Chuan-fu (School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China) Abstract: Arsenic trioxide was prepared by leaching arsenic sulfide slag in NaOH solution, oxidating with air and reducing with sulfur dioxide......