| The influence of impurities on the dissolution of Ca- and Sr-bearing barite at room temperature |
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| 作者姓名： | 张学洪 朱义年 Ingrid Stober Kurt Bucher |
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| 作者单位： | FACULTY OF URBAN CONSTRUCTION AND ENVIRONMENTAL ENGINEERING CHONGQING UNIVERSITY CHONGQING 400044 CHINA，DEPT. OF RESOURCE AND ENVIRONMENTAL ENGINEERING GUILIN UNIVERSITY OF TECHNOLOGY GUILIN 541004 CHINA，DEPT. OF RESOURCE AND ENVIRONMENTAL ENGINEERING GUILIN UNIVERSITY OF TECHNOLOGY GUILIN 541004 CHINA，INSTITUTE FOR MINERALOGY PETROLOGY AND GEOCHEMISTRY UNIVERSITY OF FREIBURG ALBERTSTR.23B 79104 FREIBURG GERMANY，GEOLOGICAL SURVEY BADEN-WüRTTEMBERG ALBERTSTR.5 79104 FREIBURG GERMANY，INSTITUTE FOR MINERALOGY PETROLOGY AND GEOCHEMISTRY UNIVERSITY OF FREIBURG ALBERTSTR.23B 79104 FREIBURG GERMANY |
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| 基金项目： | Financial support by Provincial Education Department of Guangxi （GuiJiaoRen2003-97） and DAAD （German Academic Exchange Service）, |
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| 摘 要： | 1INTRODUCTION BARITE(BASO4)ISANEXTREMELYINSOLUBLESALT;THISAROUSESPROBLEMSINPETROLEUMINDUSTRYBECAUSE BASO4ISAPARTICULARLYINTRACTABLESCALINGAGENT.BARITE PRECIPITATIONINTHEWELLBOREENVIRONMENTGENERALLYRE QUIRESMECHANICALREMOVAL,WITHCONSIDERABLEASSOCIAT EDEXPE…
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| 关 键 词： | 杂质 溶解作用 重晶石 温度 矿床 |
The influence of impurities on the dissolution of Ca- and Sr-bearing barite at room temperature |
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| Xuehong Zhang,Yinian Zhu,Stober Ingrid,Bucher Kurt.The influence of impurities on the dissolution of Ca- and Sr-bearing barite at room temperature[J].Chinese Journal of Geochemistry,2006,25(1):71-84. |
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| Authors: | Xuehong Zhang Yinian Zhu Stober Ingrid Bucher Kurt |
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| Institution: | (1) Faculty of Urban Construction and Environmental Engineering, Chongqing University, 400044 Chongqing, China;(2) Dept. of Resource and Environmental Engineering, Guilin University of Technology, 541004 Guilin, China;(3) Institute for Mineralogy, Petrology and Geochemistry, University of Freiburg, Albertstr. 23b, 79104 Freiburg, Germany;(4) Geological Survey, Baden-Württemberg, Albertstr. 5, 79104 Freiburg, Germany |
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| Abstract: | The reaction path in the (Ba, Sr, Ca)SO-4 solid-solution aqueous-solution (SSAS) system was experimentally studied using a batch-reactor method. The effect of the impurities "fluorite" and "iron sulfides" admixed in a natural barite sample on the reaction path was followed by analyzing the aqueous solution continuously. The dissolution and precipitation of the impurity "fluorite" affected strongly the reaction path in the SSAS system, especially the Ca/Sr/Ba ratio in the aqueous solution. This influence became stronger with decreasing CaSO-4 in the solid solution. The dissolution and precipitation of fluorite could hinder the CaSO-4 component from dissolving into water, and reduce the release rate of SO{2-}-4 from the solid solution to the aqueous solution and the removing rate of Ba{2} from the aqueous solution. In the presence of fluorite and sulfides, the aqueous Ba{2} and Sr{2} concentrations were controlled by the dissolution-precipitation of the end-members BaSO-4 and SrSO-4, respectively; the aqueous F-, Ca{2} and SO{2-}-4 concentrations were controlled by the dissolution-precipitation of fluorite. The incongruent dissolution of the (Ba, Sr, Ca)SO-4 solid solution caused the solid phase to become progressively more enriched in the more insoluble component (BaSO-4), while the aqueous composition shifted towards the more soluble end-members (SrSO-4 and CaSO-4) as equilibrium was approached to. |
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| Keywords: | influence of impurities dissolution barite solid solution |
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