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In this study, the boric aci d extraction from colemanite in ammonium chloride was studied and the effects of parameters such as the leaching temperature, ammonium chloride concentration, solid/liquid ratio a nd leaching time were investigated on the boric acid extraction from colemanite. Statistical design of experiments and the analysis of variance were carried out. The experiments were performed in a 500-mL cylindrical glass reactor equipped with a mechanical stirrer, a thermostat for controlling the leaching t...