阴离子黏土处理增强型地热系统返排液的研究

Treat of the fracturing fluid from Enhanced Geothermal Systems by using selected anion clays

增强型地热系统返排液中一般存在多种有害组分.利用不同类型阴离子黏土(焙烧后水铝钙石、焙烧后水氯铁镁石、焙烧后水滑石和CO_3^(2-)插层水滑石)开展了实验室配制或基于化学刺激实验所获返排液样品中氟、砷、硼、氯等有害阴离子组分的去除实验研究.结果表明,CO_3^(2-)插层水滑石可用于有效处理以氟化物和/或氯化物为主要有害组分的青海扎仓寺样品和法国Soultz-sous-Forêts样品;而对于以氟、砷、硼为主要有害组分的美国Fenton Hill样品,焙烧后水铝钙石、水氯铁镁石和水滑石的混合物(质量比为1∶1∶4)为处理效果最佳的阴离子黏土组合.

Fracturing liquid from Enhanced Geothermal Systems usually contains a variety of harmful constituents.Different anion clays（calcined hydrocalumite,calcined iowaite,calcined hydrotalcite and hydrotalcite with CO32-as interlayer anions）were used to remove the harmful constituents（fluoride,arsenic,boride,chloride and so on）in the fracturing liquid either prepared in the laboratory or obtained by chemical stimulation experiments.Experimental results showed that hydrotalcite with CO32-as interlayer anions effectively treated the fracturing liquid sample from Zhacangsi in Qinghai province and Soultz-sous-Forêts in France with fluoride and/or chloride as main components.A mixture of calcined hydrocalumite,iowaite and hydrotalcite（mass tatio is 1∶1∶4）optimally treated the sample from Fenton Hill in Ameirica with fluoride,arsenic and boride as main components.