偏硼酸锂熔融分解锆英砂的实验条件优化研究  

Optimization of experimental conditions for melting decomposition of zircon sands by lithium metaborate

作　　者：王家松 王力强 王娜[1,2,3] 方蓬达 曾江萍 张莉娟 WANG Jia-song;WANG Li-qiang;WANG Na;FANG Peng-da;ZENG Jiang-ping;ZHANG Li-juan(Tianjin Center of Geological Survey,China Geological Survey,Tianjin 300170,China;North China Center for Geoscience Innovation,Tianjin 300170,China;Key Laboratory of Muddy Coast Geo-Environment,China Geological Survey,Tianjin,China)

机构地区：[1]中国地质调查局天津地质调查中心,天津300170 [2]华北地质科技创新中心,天津300170 [3]中国地质调查局泥质海岸带地质环境重点实验室,天津300170

出　　处：《华北地质》2022年第4期48-52,共5页North China Geology

基　　金：中国地质调查局项目“地质调查标准化与标准制修订(2019-2021)(DD20190472)”。

摘　　要：偏硼酸锂是地质样品化学分析中使用最广泛的熔剂之一,从文献报道看,其熔融分解地质样品的实验条件存在较大差异,特别是在熔融锆英砂的研究中,实验条件的优化不够全面,未涉及影响熔融效果的温度、时间和影响提取效果的熔块提取方式、络合剂用量及提取酸度等实验条件。本文通过系列的高温熔融、熔块提取条件实验,获得了偏硼酸锂分解锆英砂的最佳实验条件:以铂坩埚为熔融器皿,偏硼酸锂用量0.5 g(称样量0.1 g),熔融温度950℃,熔融时间15 min,提取方式为骤冷淬裂和超声振荡,提取液为含10 g/L酒石酸的盐酸(2+8)溶液。结合本法与ICP-OES测定锆英砂中锆、铪、钾、钙、钠、镁、铝、铁、钛、锰等10种元素,各元素含量的相对误差(RE)≤4.00%,相对标准偏差(RSD)≤5.17%,可满足地矿实验室锆英砂及类似难熔砂矿的分析要求。Lithium metborate is widely used in alkaline fusion decomposition of geological samples. At present,the experimental conditions of fusion decomposition of geological samples by lithium metaborate are quite different. Moreover, the optimization of experimental conditions is not comprehensive enough in the study of zircon sands. The fusion temperature and time and the extraction method of frit, the amount of complexing agent and the acidity of extraction were not involved. In this paper, the best experimental conditions for the decomposition of zircon sands by lithium metaborate were obtained through a series of experiments. The platinum crucible was used as fusing vessel, the dosage of lithium metapborate was 0.5 g(the dosage of sample was 0.1 g), the fusing temperature was 950 ℃, the fusing time was 15 min, the extraction method was quenching + ultrasonic oscillation, and the extraction solution was(2+8) hydrochloric acid solution containing 10g/L tartaric acid. Combined with ICP-OES to determine zirconium, hafnium, potassium, calcium, sodium, magnesium, aluminum, iron, titanium and manganese in zircon sands, The relative error(RE) and relative standard deviation(RSD) of elements of this method were ≤4.00% and ≤5.17%, respectively. The results show that this method is suitable for quantitative analysis of petrogenetic elements and ore-forming elements in zircon sands.

关 键 词：锆英砂 偏硼酸锂熔融 酒石酸络合 超声振荡提取 ICP-OES 

分 类 号：P575[天文地球—矿物学]