碱熔-电感耦合等离子体发射光谱法测定湖南香花岭矿区锡铅锌矿床中的锡铅锌  

Determination of Tin,Lead and Zinc in a Tin-Lead-Zinc Deposit in Xianghualing Mining Area,Hunan Province by Inductively Coupled Plasma-Optical Emission Spectrometry with Alkali Fusion

作　　者：肖细炼 夏金龙[1,2] 李小丹 卢友月 杨小丽[1,2] 杨红梅 XIAO Xilian;XIA Jinlong;LI Xiaodan;LU Youyue;YANG Xiaoli;YANG Hongmei(Research Center for Petrogenesis and Mineralization of Granitoid Rocks,China Geological Survey,Wuhan 430205,China;Wuhan Center of China Geological Survey,China Geological Survey(Central South China Innovation Center for Geosciences),Wuhan 430205,China)

机构地区：[1]中国地质调查局花岗岩成岩成矿地质研究中心,湖北武汉430205 [2]中国地质调查局武汉地质调查中心(中南地质科技创新中心),湖北武汉430205

出　　处：《岩矿测试》2023年第1期125-135,共11页Rock and Mineral Analysis

基　　金：中国地质调查局花岗岩成岩成矿地质研究中心开放基金项目(PMGR202012);中国地质调查局地质调查项目(DD20221777,DD20190154)。

摘　　要：湖南香花岭矿区是南岭地区东西向构造-岩浆-成矿带的重要组成部分,矿区内成矿地质条件非常优越,以矿床类型多、矿产种类复杂而著称,其中锡铅锌矿床是该矿区南岭成矿带非常重要的多金属矿床,赋存的矿石类型主要以锡石-硫化物型锡矿石、锡铅锌矿石、硫化物型铅锌矿石为主,为了进一步研究区域成矿条件、矿床地质特征、元素赋存状态及有色金属矿产综合利用,准确测定锡、铅、锌有色金属元素的含量非常必要。湖南香花岭矿区锡铅锌矿床中锡、铅、锌元素的平均品位都为百分含量,且锡本身是一种难分解元素,因此,常规的酸溶很难将高含量的锡、铅、锌元素分解完全。针对香花岭矿区锡铅锌矿床样品的特殊性,本文建立了碱熔-电感耦合等离子体发射光谱同时测定湖南香花岭矿区锡铅锌矿床中锡铅锌的分析方法:(1)优化了碱熔试剂选择、试剂用量、碱熔温度、碱熔时间等实验前处理及等离子体激发条件、元素谱线、扣背景位置等仪器测定条件,在比较氢氧化钠、无水碳酸钠和过氧化钠3种熔剂对分析结果影响的基础上,选择以4.0g过氧化钠作为熔剂,在750℃下恒温熔融试样20min,约30mL沸水浸提后加入20mL浓盐酸酸化,保证样品分解完全;(2)以空白碱熔酸化溶液为介质配制校准系列,使得校准系列与试样基体匹配,消除了基体干扰影响。(3)采用国家一级地球化学标准物质进行方法质量评估,结果表明标准物质测定值与标准值的对数差值的绝对值(Δlgw)<0.04,锡、铅、锌的方法检出限分别为13.60、36.45、53.83μg/g,方法精密度(RSD)均优于8%,校准曲线测定范围为0~100μg/mL。由于采用碱熔方法和以空白碱熔酸化溶液作为标准配制介质,使得该方法适用于锡石-硫化物型锡矿石、锡铅锌矿石、硫化物型铅锌矿石中高含量锡铅锌测定。BACKGROUND:The Xianghualing mining area in Hunan Province is an important part of the east-west tectonic-magmatic-metallogenic belt in the Nanling area.The ore-forming geological conditions in the mining area are superior,and it is famous for its many types of deposits and complex types of minerals.The tin-lead-zinc deposit in the Xianghualing mining area is a very important polymetallic deposit in the Nanling metallogenic belt.The ore types are mainly cassiterite sulfide tin ore,tin-lead-zinc ore and sulfide lead-zinc ore.Tin,lead and zinc are very important nonferrous metal elements.The abundance and variation characteristics of these three elements can reflect the regional metallogenic conditions,indicate the existence of deposits or mineralization,and are the important basis for studying the metallogenic model,deepening the understanding of the genesis of the deposit,and identifying the metallogenic control factors.Therefore,it is very necessary to accurately determine the content of tin,lead and zinc in the tin,lead and zinc deposits in the Xianghualing mining area,and it is important to study the regional metallogenic conditions The geological characteristics of the deposit,the occurrence state of elements,mineral processing and comprehensive utilization of non-ferrous metal minerals are of great significance.However,the average grades of tin,lead and zinc in the deposit are percentage contents and tin itself is a refractory element.Conventional open acid dissolution or closed acid dissolution in the dissolution of high content of tin,lead and zinc in the ore will have the disadvantages of incomplete digestion and easy precipitation of the solution,resulting in serious low determination results.However,alkali fusion is more capable of decomposing minerals than acid dissolution.As long as the appropriate alkali fusion reagent,temperature and time are optimized,some high content of inorganic elements,even insoluble elements,can be completely decomposed,which is an ideal method of mineral decomposition pretrea

关 键 词：碱熔 电感耦合等离子体发射光谱法 香花岭 锡铅锌矿床 锡 铅 锌 

分 类 号：O657.31[理学—分析化学]