Recovery and purification of kish graphite from steelmaking dust by using acid leaching with physical auxiliary methods

Table 2 Leaching concentrations of metals in the purification processes with various types of acids

Concentration (mg L⁻¹)	HCl	HNO₃	H₂SO₄	HBF₄	MA1	MA2
Na	11.26	11.65	9.66	28.05	13.65	35.90
K	16.64	19.32	16.22	24.17	20.85	28.70
Mg	254.4	256.9	233.3	256.6	243.8	260.6
Ca	1567	1446	529	1362	1521	1521
Al	214.2	212.5	196.0	259.8	211.5	228.6
Si	254.9	295.7	228.6	548.3	562.5	649.6
Fe	4599	3540	3755	5245	4710	5122
Ti	13.50	13.41	12.50	17.80	15.90	19.02
Mn	29.97	27.45	29.01	34.99	31.65	33.90
Zn	21.01	18.26	20.47	22.49	22.10	24.42

¹Acid concentration, L/S ratio, and reaction time were 1.0 N, 10 L kg⁻¹, and 60 min, respectively
²Cr, Co, Ni, Cu, As, Se, Cd, Ba, Hg, and Pb were below detection limit (< 0.01 mg L⁻¹)

ISSN: 2468-2039