锂精矿中二氧化硅、三氧化二铝和氟量同时快速检测分析  

Simultaneous and rapid analysis of SiO₂,Al₂O₃,and F contents in lithium concentrate

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作  者:刘芳美 李文英 甘聪 钟坚海 Liu Fangmei;Li Wenying;Gan Cong;Zhong Jianhai(Zijin Copper Co.,Ltd.;Fujian Key Laboratory for Green Production of Copper and Comprehensive Utilization of Associated Resources;Technology Center,Xiamen Customs)

机构地区:[1]紫金铜业有限公司 [2]福建省铜绿色生产及伴生资源综合利用重点实验室 [3]厦门海关技术中心

出  处:《黄金》2025年第2期109-113,共5页Gold

摘  要:锂精矿中的硅、铝、氟等杂质对下一步的精制过程有很大影响,可能降低锂回收率并影响产品质量。研究采用氢氧化钠-过氧化钠对锂精矿样品进行熔融前处理,分别采用硅钼蓝分光光度法、络合滴定法、离子选择性电极法同时快速测定样品中的二氧化硅、三氧化二铝和氟含量。探讨了熔剂的选择、熔融温度和时间、酸度等实验条件对各元素测定结果的影响。实验表明,采用氢氧化钠-过氧化钠作为混合熔剂,熔融温度为700℃,熔融时间为15 min,盐酸加入量为20 mL时,试样溶解完全。本方法二氧化硅、三氧化二铝和氟测定结果的相对标准偏差(RSD,n=7)分别为0.53%~0.57%、0.37%~0.64%、0.31%~1.18%,符合GB/T 32465—2015《化学分析方法验证确认和内部资料控制要求》对相对标准偏差的要求,且与3种行业标准方法测定结果吻合良好。该方法可应用于锂精矿中二氧化硅、三氧化二铝和氟的同时快速检测分析。Impurities such as silicon,aluminum,and fluorine in lithium concentrate significantly affect the sub⁃sequent refining process,potentially reducing lithium recovery rates and impacting product quality.This study proposes a rapid method for the simultaneous determination of SiO₂,Al₂O₃,and F contents in lithium concentrate.Lithium con⁃centrate samples were pretreated before fusion with sodium hydroxide-sodium peroxide mixture,followed by analysis using the silicomolybdenum blue spectrophotometric method,complexometric titration,and ion⁃selectiveelectrode method.The effects of flux selection,fusion temperature and duration,and acidity on the determination results were investigated.The test shows that when using the sodium hydroxide-sodium peroxide mixed flux,with a fusion temperature of 700℃,fusion time of 15 min,and adding 20 mL of hydrochloric acid,the sample is completely dissolved.The relative standard deviations(RSD,n=7)of SiO₂,Al₂O₃,and F using the method were 0.53%-0.57%,0.37%-0.64%,and 0.31%-1.18%,respectively,meeting the requirements of the GB/T 32465—2015 Requirement for Verification&Validation of Detection Methods and Internal Quality Control on Chemical Analysis for RSD,and the results are consistent with 3 industrial standard methods.The method can be applied to the simultaneous and rapid analysis of SiO₂,Al₂O₃,and F contents in lithium concentrate.

关 键 词:锂精矿 硅钼蓝分光光度法 络合滴定法 离子选择性电极法 同时测定 快速测定 

分 类 号:TD926.3[矿业工程—选矿]

 

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