Recuperación de azufre a partir de residuos de plomo y zinc

Recuperación de azufre a partir de residuos de plomo y zinc

junio 9th, 2026

Recuperación de azufre a partir de residuos de plomo y zinc

In several lead‑zinc flotation tailings sites in western and northern Guangdong Province, spiral chute gravity separation is used to recover pyrite from the tailings. The mineral composition, single‑mineral analysis of pyrite, multi‑element analysis, and sieve analysis of the lead‑zinc flotation tailings from northern and western Guangdong are shown in Tables 4‑49 to 4‑52, respectively.

Table 4‑49 Mineral composition

Northern Guangdong lead‑zinc tailings	Western Guangdong lead‑zinc tailings
Pyrite with small amounts of galena and sphalerite	Pyrite with small amounts of lead‑zinc minerals, hematite, and limonite
Gangue minerals mainly sericite, quartz, calcite, chlorite, with minor dolomite, etc.	Gangue minerals: quartz, feldspar, kaolin, sericite, dolomite, calcite, etc.

Table 4‑50 Single‑mineral analysis of pyrite from northern Guangdong (%)

Componente	S	Fe	Pb	Zn	Cu	Total
Mass fraction	52.73	43.35	0.49	0.071	0.005	96.85

Table 4‑51 Multi‑element analysis of northern Guangdong lead‑zinc tailings (%)

Componente	S	Como	SiO₂	Al₂O₃	CaO	Ag (g/t)
Mass fraction	30.5	0.21	16.33	2.80	7.21	64.0

Table 4‑52 Sieve analysis results

Particle size fraction/mm	the northern part of Guangdong Province			the western part of Guangdong Province
	产率/%	品位/%	分布率/%	产率/%	品位/%	分布率/%
+0.2	7.06	14.85	3.73		一	一
-0.20+0.10	27.00	23.22	22.31	7.16	2.32	0.71
-0.10+0.076	12.25	33.54	14.62	30.18	14.37	18.68
-0.076+0.043	18.87	35.92	24.12	24.55	31.85	33.68
-0.043+0.030	6.08	38.85	8.41	17.65	32.85	24.96
-0.030	28.74	26.21	26.81	20.46	24.93	21.97
合计	100.00	31.46	100.00	100.00	23.22	100.00

Through testing, a single pass of the lead‑zinc tailings through a spiral chute (process flow shown in Figure 4‑33) yields a pyrite concentrate with a grade of 39.75%–44.80% and a recovery of 58%–74%.

Figure 4‑33 Process flow of spiral chute separation