Comparison of two purification methods of Algerian bentonite: chemical, mineralogical and physicochemical properties

ENP Engineering Science Journal

article

Nabil Babahoum¹  Malek Ould Hamou²  Amira Merchichi²  Farid Aghilasse Mansour² 

[1] SONATRACH;Ecole Nationale Polytechnique

关键词: Bentonite;    Centrifugation;    Mineralogical;    Beneficiation;    Material.;   

DOI  :  10.53907/enpesj.v2i1.64

学科分类：社会科学、人文和艺术（综合）

来源: Ecole Nationale Polytechnique

【 摘 要 】

The aim of this work is to evaluate the efficiency of two methods of purification on Algerian bentonite clay.The first method was performed by centrifugation treatment, using sodium hexametaphosphate (NaPO3)6 as adispersing agent. The second method involves a chemical purification with NaCl, followed by sedimentation technique.The study concerns mineralogical, chemical, structural aspects and a series of physical testing. The results have shownthat the raw bentonite (RBN) contain (~ 59%) of montmorillonite, illite (~ 5) and (~26%) of quartz, and feldspar(orthoclase + albite), with 5% of calcite. In the purified state by NaCl (RBN-2), the mineralogical and physicochemicalproperties including cation exchange capacity and specific surface area are higher than the purified samples byphysical beneficiation (by centrifugation - RBN-1). Moreover, the treatment with NaCl increased themontmorillonite content of the bentonite from 56 % to 100%. The quartz impurities were totally removed in RBN2, whereas impurities (quartz + feldspar) were still observed by the X-ray diffraction (XRD). Finally, the resultsobtained from the morphological, mineralogical and chemical characterization confirm that the bentonite RBN -2was more effective , and it has promise as an engineering material compared to the RBN and RBN-1, indicating itspossible application in various industrial applications.

【 授权许可】

CC BY-NC-SA