Study of the Dissolution of Tahoua Natural Phosphate by Mineral Acids: Hydrochloric Acid and Sulfuric Acid
INOUSSA Halidou Bassirou
Materials, Water and Environment Laboratory, Chemistry Department, Faculty of Science and Technology, Abdou Moumouni University, BP: 10662, Niamey, Niger.
YAHOUZA Zaneidou *
Department of Didactics of Disciplines, Faculty of Education Sciences, Djibo Hamani University, Tahoua, BP: 255, Tahoua, Niger.
AMADOU HAMIDOU Abdoulaye
Department of Water and Forestry/Rural Engineering, Faculty of Agronomy, Faculty of Agronomy, Abdou Moumouni University, BP: 10662, Niamey, Niger.
ZANGUINA Adamou
Materials, Water and Environment Laboratory, Chemistry Department, Faculty of Science and Technology, Abdou Moumouni University, BP: 10662, Niamey, Niger.
*Author to whom correspondence should be addressed.
Abstract
The transformation of natural phosphorus into plant nutrient phosphorus, natural phosphates from Tahoua were dissolved in mineral acids, hydrochloric acid and sulfuric acid. Dissolution was effected at various concentrations (0.01M; 0.1M and 1M) and stirring times (1 hour, 3 hours and 5 hours). The results show that for all two acids (2), the dissolution rate is greater in concentrated acid solutions (1M) and for the 5-hour attack time. These rates are 38.37% and 34.87% respectively for sulfuric and hydrochloric acid solutions. Dissolution of Tahoua natural phosphate depends on the concentration of etching solutions and the etching time. With mineral acids (sulfuric and hydrochloric acid), for example, it increases with concentration. This dissolution offers interesting visions for perfecting phosphate fertilizers.
Keywords: Natural phosphate, dissolution sulfuric acid, hydrochloric acid