轻烧白云石处理含硼废水的方法研究  

Disposal of Boron-Containing Wastwater by Lightly-Burnt Dolomite

作　　者：魏尊莉[1] 姜义营 鲁安怀[1] 李振营 颜云花[1] 王长秋[1] 

机构地区：[1]北京大学造山带与地壳演化教育部重点实验室地球与空间科学学院,北京100871 [2]辽宁省营口市水务公司,辽宁营口115000

出　　处：《矿物学报》2010年第3期349-354,共6页Acta Mineralogica Sinica

基　　金：国家重点基础研究发展计划资助项目(973项目)(2007CB815602)

摘　　要：采用辽宁某矿山的硼废水,研究了轻烧白云石对废水中硼的吸附及其影响因素,硼在矿物表面的吸附状态以及吸附作用机理,确定了实验最佳条件。在20mL反应体系中,反应温度为25℃,溶液pH为9.5～10.5,白云石(热处理温度750℃,粒径200～300目)矿样用量为2.0g,反应3h后,除硼率可达90%以上。pH<9.2时,矿物对硼的吸附作用甚微;9.2<pH<12(轻烧白云石的零电荷点)时,溶液中的B(OH)4-被吸附到矿物表面,吸附机制为外层络合模式,此过程中OH-浓度是硼吸附量的重要控制因素;pH>12时,矿物表面带负电,无静电吸附作用。通过XPS及红外光谱分析,硼以硼氧四面体的络合结构形式吸附于矿样表面。To dispose of boron-containing wastewater from a mine in Liaoning Province,China,the factors affecting both adsorption process and adsorption state of boron on lightly-burnt dolomite surface,combined with the adsorption mechanisms were thoroughly investigated.Over 90% of boron was removed under the optimal experimental conditions,i.e.2 g dolomite in size of 200 ～ 300 mesh after being heat-treated at 750℃ ,and reacted with 20 mL wastewater at pH 9.5 ～ 10.5 for 3 hours.The pH value determined the forms of boron compounds and the adsorption process.When pH was lower than 9.2,the adsorption of boron on lightly-burnt dolomite was not obvious.When pH was between 9.2 and 12 （the potential of zero charge of lightly-burnt dolomite） ,B（OH） 4-was adsorbed on the mineral surfaces by the outer complex mode.In terms of this process,the boron adsorption capacity was predominantly decided by the OHconcentration.When pH was higher than 12,the mineral surface was negatively charged,and there was no electrostatic adsorption.The analysis of X-ray photoelectron spectroscopy （XPS） and fourier transformation infrared spectra （FT-IR） indicated that boron was adsorbed on the surfaces of lightly-burnt dolomite with the complexing structure of BO4 tetrahedron.

关 键 词：轻烧白云石 含硼废水 处理方法 

分 类 号：P578.6[天文地球—矿物学] P579[天文地球—地质学]