Imports In 2002, Burundi imported $166 in Refined sulphur, not sublimate, precipitate, colloida, becoming the 0th largest importer of Refined sulphur, not sublimate, precipitate, colloida in the world. At the same year, Refined sulphur, not sublimate, precipitate, colloida was the 0th most imported product in Burundi. Burundi imports Refined sulphur, not sublimate, precipitate, colloida primarily from: N/A.