Flue dust, lead-refining

Additional physico-chemical information

Administrative data

Endpoint:

other: representative mineralogy

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: non GLP but other quality assurance

Cross-reference

Reason / purpose for cross-reference:

reference to same study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Report date:

2010

Materials and methods

Principles of method if other than guideline:

Chemistry /elemental analysis was determined using ICP (inductively Coupled Plasma spectroscopy). Metal speciation/metal mineralogy was assessed from Sequential extraction/metal analysis and mineralogical analysis (XRD and microscopes equipped with EDS (Energy Dispersive Spectrometry) and WDS (Wavelength Dispersive Spectrometry) analysers. The interpretation of the overall results was performed by expert (with profound knowledge of metal particularities).

GLP compliance:

no

Remarks:

other quality assurance

Test material

Test material information

Constituent 1

Results and discussion

Results:

The studied Flue dust, sample 09TT09775 contains 30.5% lead, 16.6% zinc, 11.8% Na2O, 2.5% cadmium, 2.2% sulphur, 1.5% iron, 1% SiO2 and traces of other elements.
The studied Flue dust, sample 09TT08073 contains 41% lead, 12.8% CaO, 10.5% sulphur, 2.2% K2O, 1.5% tin, 1% Na2O and traces of other elements.

The studied Flue dust, sample 09TT09775 consists mainly of Zn-bearing natrojarosite (51%), anglesite (20.4%) and metallic lead (14.8%). Other notable mineral phases are lead antimony-, lead zinc- and lead tin oxides (total 5.4%), zincite (5.1%) and zinc sodium- & lead silicate hydrates (total 2.2%).
The studied Flue dust, sample 09TT08073 consists mainly of fine-grained cotunnite, PbCl2 (48.7%), anhydrite (44.5%) and anglesite (6.9%).

Any other information on results incl. tables

Chemical composition of the reference samples

ORC ref.			OR27	OR12
Sample			2000171/19	2000171/15
Lab code			09TT09775	09TT08073
Substance			Flue dust lead refining		Flue dust lead blast furnace
EINECS			273-809-1	274-633-8
Consortium reference No.			9	30
Ag	KEM	%	0.009	<0.002
B	KEM	%	N/A	N/A
Bi	TOT	%	<0.03	< 0.010
Cd	TOT	%	2.49	0.672
Co	TOT	%	<0.01	<0.004
Mo	TOT	%	<0.005	< 0.004
Sb	TOT	%	1.6	0.363
Se	TOT	%	<0.002	0.021
Sn	TOT	%	0.37	1.5
Te	TOT	%	<0.02	< 0.020
Zn	TOT	%	16.6	0.24
SiO2	KEM	%	1.00	0.252
Al2O3	TOT	%	0.47	0.084
CaO	TOT	%	0.59	12.8
Cr2O3	TOT	%	0.032	<0.006
K2O	TOT	%	<0.1	2.2
MgO	TOT	%	0.2	0.287
MnO	TOT	%	0.017	0.025
Na2O	TOT	%	11.8	1.04
(SO4)2	KEM	%	6.28	31
S	LECO	%	2.16	10.5
C	LECO	%	0.03	0.32
Satmagan		%	0.22	0

ORC ref.			OR27	OR12
Sample			2000171/19	2000171/15
Lab code			09TT09775	09TT08073
Substance			Flue dust lead refining	Flue dust lead blast furnace
EINECS			273-809-1	274-633-8
Consortium reference No.			9	30
As	P1	%	<0.004	<0.008
	P2	%	0.077	0.05
	P3	%	<0.005	<0.010
	P4	%	0.006	0.01
	PSUM	%	0.083	0.06
	TOT	%	0.091	0.06
Cu	P1	%	<0.004	<0.008
	P2	%	0.035	<0.20
	P3	%	0.03	0.016
	P4	%	0.024	0.006
	PSUM	%	0.089	0.02
	TOT	%	0.084	0.03
Fe	P1	%	<0.004	<0.008
	P2	%	0.54	0.104
	P3	%	0.009	<0.010
	P4	%	0.73	0.145
	PSUM	%	1.28	0.25
	TOT	%	1.46	0.31
Ni	P1	%	<0.004	<0.008
	P2	%	<0.010	<0.020
	P3	%	<0.005	<0.010
	P4	%	0.009	<0.004
	PSUM	%	0.009	<0.004
	TOT	%	0.016	<0.004
Pb	P1	%	0.015	0.537
	P2	%	0.241	0.22
	P3	%	0.89	2.05
	P4	%	24.20	36.3
	PSUM	%	25.35	39.11
	TOT	%	30.50	41.00

Applicant's summary and conclusion

Conclusions:

Good quality study that assessed full chemistry and mineralogy of two representative samples of flue dust lead refining/flue dust blast furnace. The mineralogy (and the distribution pattern for each key element, i.e. % from Total into the various mineralogical forms/species present into the UVCB) of the reference samples can be used to derive the classification of flue dust lead refining (or flue dust blast furnace) samples (mixture toxicity rules).

Executive summary:

The studied Flue dust, sample 09TT09775 consists mainly of Zn-bearing natrojarosite (51%), anglesite (20.4%) and metallic lead (14.8%). Other notable mineral phases are lead antimony-, lead zinc- and lead tin oxides (total 5.4%), zincite (5.1%) and zinc sodium- & lead silicate hydrates (total 2.2%).

The studied Flue dust, sample 09TT08073 consists mainly of fine-grained cotunnite, PbCl2 (48.7%), anhydrite (44.5%) and anglesite (6.9%).

The mineralogy of the reference samples can be used to derive the classification of both samples but also to predict the mineralogy of other flue dust lead refining (or flue dust blast furnace) samples. Differences in speciation between the reference samples, and anticipated differences in classification, initially suggested the need for two grades of this intermediate based on the sulphur content. As a consequence, company specific classifications were calculated using one of the two different speciation patterns.

The calculator sheets, which are used to derive the classification and which reflect particular assumptions that are made, can be found in attachment above (attached background material).