SciELO
As a source of potassium and to compose the acid-base reaction binding system, KH 2 PO 4 (KDP), provided by Meta Química, Brazil, was used at a purity of 99%. The waste (~3 kg) was ground in a jaw crusher (Marconi MA4080, Brazil) up to a particle size of < 5 mm and then dried in a laboratory oven (CIENLAB-CE 220/100, Brazil) at 110 ± 5 °C ...