Abstract：In the preparation process of sodium stannate by soda reduction roasting-leaching of tin concentrate, the phases of tin in reduction roasting sample must be explicated in order to better understand the reduction roasting mechanism of tin concentrate and better control the experimental conditions to improve the conversion rate of sodium stannate. Two methods to analyze the phase of tin were proposed in experiments. Scheme 1: metallic tin was dissolved selectively with bromoethanol (3+97) solvent. The dissolution rate of metallic tin was more than 97% under the optimal conditions, i.e., dissolution temperature and time were 25 ℃ and 20 min,respectively. Meanwhile, the dissolution rate of stannous oxide, sodium stannate and tin dioxide was less than 1%. Then stannous oxide and sodium stannate were dissolved selectively with hydrochloric acid (1+1) solvent. The dissolution rate of stannous oxide and sodium stannate was more than 99% under the optimal conditions, i.e., dissolution temperature and time were 25 ℃ and 20 min. Meanwhile, the dissolution rate of tin dioxide was less than 3%. Scheme 2: stannous oxide and sodium stannate were dissolved selectively with 5 g/L sodium hydroxide and 2 g/L sodium tartrate solution. The dissolution rate of stannous oxide and sodium stannate was more than 97% under the optimal conditions, i.e., dissolution temperature and time were 60 ℃ and 20 min, respectively. Meanwhile, the dissolution rate of metallic tin and tin dioxide was less than 1%. Then the metallic tin was dissolved selectively with bromoethanol (3+97) solvent in Scheme 1.The relative standard deviations (RSD) of determination results of tin phases in two schemes were all below 3%, which could meet the error requirement in phase analysis. The trueness in two experiments schemes indicated that both schemes were feasible, which could meet the analysis requirements of tin phases in tin concentrate sample after soda reduction roasting.
罗文波, 张琼, 周东波, 洪开发, 谢瑶, 郑凯. 锡精矿苏打还原焙烧样品中锡的物相分析方法探讨[J]. 冶金分析, 2021, 41(10): 42-48.
LUO Wenbo, ZHANG Qiong, ZHOU Dongbo, HONG Kaifa, XIE Yao, ZHENG Kai. Discussion on phase analysis method of tin in soda reduction roasting sample of tin concentrate. , 2021, 41(10): 42-48.
[1] 杨光.锡石精矿苏打焙烧-浸出制备锡酸钠的研究[D].长沙:中南大学,2013:29-34. [2] 张元波,杨光,苏子键,等.二氧化锡钠盐焙烧-水浸制备锡酸钠的可行性研究[J].矿冶工程,2013,33(6):80-83. ZHANG Yuanbo,YANG Guang,SU Zijian,et al.Feasibility study for preparing sodium stannate from stannic oxide by sodium roasting-water leaching [J].Mining and Metallurgical Engineering,2013,33(6):80-83. [3] 李慧,龙萍,任新林,等.复杂锡精矿还原熔炼过程中元素在金属和渣相中的分布[J].过程工程学报,2016,16(1):132-137. LI Hui,LONG Ping,REN Xinlin,et al.Distributions of elements in metal and slag phases during the reduction smelting process of complex tin concentrate[J].The Chinese Journal of Process Engineering,2016,16(1):132-137. [4] 李磊,邱在军,王华,等.锡铁精矿硫化焙烧脱锡[J].中国有色金属学报,2014,24(2):519-526. LI Lei,QIU Zaijun,WANG Hua,et al.Removing tin from tin-bearing iron concentrates with sulfidation roasting[J].The Chinese Journal of Nonferrous Metals,2014,24(2):519-526. [5] JIANG Tao,ZHANG Yuanbo,HUANG Zhucheng,et al.Fundamental study on utilization of tin,zinc-bearing iron concentrate by selective by selective chlorination[J].Transaction of Nonferrous Metals Society of China,2005,15(4):902-907. [6] 孙杰,安成强,谭勇,等.镀锡液锡泥中锡的物相分析[J].冶金分析,2012,32(10):56-59. SUN Jie,AN Chengqiang,TAN Yong,et al.Study of phase analysis on tin slurry in tin electroplating solution[J].Metallurgical Analysis,2012,32(10):56-59. [7] 赵缨,阮鸿兴.还原焙烧产品中锡的物相分析方法研究[J].冶金分析,2000,20(3):29-32. ZHAO Ying,RUAN Hongxing.Analytical method for Sn mineralogical phase distribution in reduction roasting product [J].Metallurgical Analysis,2000,20(3):29-32.
