Recovery of phosphate from calcinated bone by dissolution in hydrochloric acid solutions

In this study, the optimum conditions of dissolution of calcinated bone in HCl solutions with different concentrations are investigated. Recovery of p hosphate from calcinated bone by dissolution with hydrochloric acid solutio ns was investigated in a batch reactor, it was observed that a 32% hydrochl oric acid solution can dissolve the calcinated bone effectively. Using the Taguchi fractional design method, it was found that the optimum process con ditions, at which 67.2% P2O5 dissolution was reached, were as follows: Reac tion temperature: 318 K, solid-to-liquid ratio: 1/5 (g ml(-1)), acid concen trations:32 (% w/v), stirring speed:400 min(-1) and reaction time: 60 min. (C) 1999 Elsevier Science B.V. All rights reserved.