Characteristics of congruent dissolution of silicate minerals enhanced by chelating ligand under ambient conditions

• DOI: 10.2138/am-2023-9025
• Publication Date: 2024-01-02T21:47:55Z
• Authors: Jiajie Wang; Astin Nurdiana; Yoshinori Sato; Noriaki Watanabe; Noriyoshi Tsuchiya
• Keywords: Silicate minerals

Abstract Natural and anthropogenic chelating ligands play important roles in promoting mineral dissolution during water-rock interactions. To address the remaining issue of how participate minerals, this study investigated characteristics seven types silicate minerals presence a ligand, N,N-bis(carboxymethyl)-L-glutamic acid (GLDA), which is glutamic derivative, through batch experiments. The results showed that all i.e., olivine (nesosilicate), epidote (sorosilicate), tourmaline (cyclosilicate), enstatite (single-chain inosilicate), hornblende (double-chain biotite (phyllosilicate), anorthite (tectosilicate), can be enhanced by up to two orders magnitude at both pH 4 8. ligand particularly facilitated with higher Al content, such as anorthite. Furthermore, leaching not only metals but also Si from resulting more congruent characteristic dissolution. A possible mechanism adsorbs onto negatively charged surface, attracts H+ polarizes Si-O Mg-O bonds, thereby dissolving faster rate. These have significant implications for understanding nature application agents geological materials engineering.