Results

	NATIONAL TECHNICAL UNIVERSITY OF ATHENS SCHOOL OF MINING AND METALLURGICAL ENGINEERING Section of Metallurgy and Materials Technology *Laboratory of Metallurgy*
	HYDROMETALLURGY UNIT

Results

TABLE 1

Pilot -scale heap leach test of a low-grade greek nickel oxide ore by the HELLAS Method

Percent extraction of metals

*Α/Α* *Leach Cycle*	*Leach Cycle Duration* *(days)*	*ELEMENTS*							*Fe/Ni* *In the leach liquor*
*Α/Α* *Leach Cycle*	*Leach Cycle Duration* *(days)*	*Ni recovery* *(%)*	*Co recovery* *(%)*	*Fe recovery* *(%)*	*Al recovery* *(%)*	*Cr recovery* *(%)*	*Mg recovery* *(%)*	*Mn recovery* *(%)*	*Fe/Ni* *In the leach liquor*
0	0	0	0	0	0	0	0	0	0
1	28	21,08	10,63	2,94	3,65	1,19	12,01	31,69	6,51
2	21	31,09	17,59	5,58	6,23	3,06	37,03	32,89	8,75
3	35	40,24	22,41	7,94	5,51	4,46	52,54	39,63	9,61
4	30	51,42	31,20	11,07	7,31	5,88	60,47	45,65	10,50
*Final Recovery after washing (%)*		*59,34*	*35,67*	*12,87*	*26,34*	*6,88*	*69,94*	*52,19*

TABLE 2

Final analysis of the Pregnant Leach Solution

*Metals*	*Concentration* *(g/l)*
Ni	3,41
Co	0,17
Fe	35,80
Al	7,31
Cr	0,94
Mg	5,00
Mn	1,12

Figure 1: Percent recoveries of Ni, Co, Fe, Al, Cr, Mg and Mn versus time
during the heap leach test prior to washing the heap with water