The plant ash contains large amounts of silicon,phosphorus,potassium,calcium and so on.Experiments,mainly on the calcination temperature and time on the effectiveness of various elements.Calcination temperatures were chosen 590℃,700℃,900℃,calcination time were selected 0.5,1.0,1.5,2.0 h.To investigate the test results,were used citric acid,hydrochloric acid,sodium borate as the extraction solvent,extraction temperature were chosen 20℃,25℃,30℃,35℃,40℃.Test showed that the plant ash after calcination at 700℃,...