Abstract
Assessing improvement on the quality of clay has been conducted by treatment with different concentrations of hydrochloric and oxalic acid. This project intended to assess the effect of acid treatment on the elemental composition of clays from selected sites. The clays were leached using hydrochloric and oxalic acid separately at a concentration of 0.0, 0.1, 0.25, 0.5, 1, and 2M. The elemental composition of raw and acid-treated clays was determined using AAS. Elemental composition of the acid-treated clays, in oxide form were in the ranges of 40.80-65.16 % SiO 2 , 7.16 -30.33 % Al 2 O 3 , 0.33-7.62 %TiO 2 , 0.24-2.65 % K 2 O, 0.01-1.82 % MgO. The findings of this study showed that the quality of clays could be improved by acid treatment hence the clays can be used as a source of raw materials for industrial applications. Keywords: Acid-treatment, Elemental, raw materials DOI: 10.7176/JNSR/11-22-05 Publication date: November 30 th 2020
Highlights
Clay is a stony or earthy mineral aggregate composed of fine-grained minerals, which are plastic at appropriate water content and hardens up when fired [1,2]
[15] Studied elemental and mineralogical composition of raw and acid-washed clays from Kano plains, the findings of this study revealed that iron oxides levels were reduced by acid treatment and the second finding was that acid treatment alters the mineralogical composition of clays and results to clay minerals interconversion [15]
Most of the metallic oxides in Kimathi clay samples are leached with oxalic acid, some of those oxides include Fe2O3, Al2O3, Manganese oxide (MnO), Calcium oxide (CaO), K2O, Magnesium oxide (MgO) and TiO2, these oxides decreases with increase in oxalic acid concentration
Summary
Clay is a stony or earthy mineral aggregate composed of fine-grained minerals, which are plastic at appropriate water content and hardens up when fired [1,2]. Approaches of minimizing iron in clays include froth floatation, gravity, and magnetic separation, reductive roasting, size separation by hydrocyclone, selective flocculation and acid treatment/leaching [10, 11, 12, 13, 14, 15]. Chemical treatment methods such as acid activation improve surface and catalytic properties of clay by inducing changes in crystal structures of aluminosilicate minerals because of the dissolution of ions and/or structural rearrangement [16, 10, 5, 8]. This paper, reports the findings of the effects of acid treatment on the elemental composition of acid-treated clays
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