The Taguchi optimization method was used to determine optimum conditions for the dissolution of ulexite in phosphate acid solutions. Reaction temperature, solid-to-liquid ratio, phosphate acid concentration, reaction time, particle size and stirring speed were chosen as parameters. The optimum conditions for these parameters were found to be 60oC, 0.15g.mL-1, 0.70M, (-850+452) μm, 30 minutes and 200rpm, respectively. Under these conditions, the dissolution percentage of ulexite in phosphate acid solution was 100. Reaction products were found to be boric acid, sodium dihydrogen phosphate and calcium dihydrogen phosphate.

Tuba Hatice Doğan and Ahmet Yartaşı