Patent ID: 6444142
Filing Date: 2002-09-03
Classification: C01F,C01P,C09K,G21K

Abstract:
A method of preparing barium fluoroiodide comprising the steps of:(a) mixing barium carbonate with an aqueous solution of hydrogen iodide in a molar ratio from 0.5 to 2 of hydrogen iodide to barium carbonate, and concentrating the resultant solution to prepare a suspension having barium iodide dissolved in the solution at a concentration of at least 3.0 mol/l; (b) precipitating barium fluoroiodide by adding a total amount of hydrogen fluoride to the suspension to achieve a molar ratio from 0.4 to 0.8 of hydrogen. hydrogen fluoride is added at a rate to generate 0.001 N/minute to 10 N/minute of barium fluoroiodide precipitate, wherein N is the theoretical amount of barium fluoroiodide precipitate that can be generated based upon the amount of barium carbonate in the suspension; and (c) separating the precipitate.