THE RUSSELL PROCESS IN AUSTRALIA. 321 
(c) (d) 
MgO a sag ate roe "34 “45 
| 5 oe an a at fen 8 2G 312 
Caaen< tn oe _ sere 09 ‘08 
Ber cus dea bet bed eq SHES 9-27 
RS. ee a ek baa ite “91 “75 
URES, = Ne ees ~. 8°36 a2. 
( Sol. in water ... ae ww «=49G 3°88 
| Insol. in water... aa an SAG 2°82 
Car Bs he adic pie» OSiE i le 
Ag. (oz. per ton) .. Se a. 59°00 58-00 
Percentage of whole sélidiles in water 21:11 18:02 
(c) is an average sample of the concretions from 12 to 18 feet 
from the discharge. 
(d) is an average sample of the concretions from 6 to 12 feet 
from the discharge end of furnace. 
With an ore of this description a considerable amount of fume 
is produced, a small part of which condenses on any projections at 
the end of the furnace, whilst the remainder is carried off into the 
flue-chambers, and collects there. The composition of a hard white 
scale on the feed-spout is shown in analysis (e) ; that of the flue- 
dust treated in vat M in analysis (/). 
(°) (f) 
SIO). =. a6 nie ata gy AOD 39°72 
A1,0; Sine a ae wrap lO 7:88 
CaO... ante ae wars 3 + 120 1:29 
MgO sas sis = ee “3D ‘75 
BBS 00s ai ops ae wwe 20°29 11-40 
Ca... me — oe = ‘Pace trace 
Me... = ea Suse << | FOR 14:91 
2) ee ge = sh eer) LTO. 88 
PB ais of - = xe  aeee 5:00 
( Sol. in water ... sir wee | | OSE 1:20 
\ Insol. in water Sad =e » 22 I-79 
Ag. oz. perton ... wen 90°00 62-00 
Percentage of whole solitile 3 in water 9°65 9°63 
The feed-spout scale is largely composed of sulphate and oxide 
of lead, and oxide of arsenic with more or less partly-roasted ore 
carried over by the draught, which accounts for the 20 per cent. 
of silica contained in it. 
The flue-dust forms an almost impalpable powder, made up of 
the finest portions of the ore carried out of the furnace by the 
draught with some volatile compounds of lead and arsenic. 
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