122 Correspondence of J. Nickles. 
® 
chloric acid and washing; for the lime would give rise to CaS, then 
CaO 80%, and then again CaS, increasing unnecessarily the volume o 
material under manipulation, and causing a loss of carbon and heat 
The carbon should not be in excess, as it favors the formation of sul- 
phuret of sodium, and because also of this excess remaining wiih the 
sulphuret of iron, will afierwards afford, in the roasting of “the e 
some sulphurous acid mixed with the ee acid, ‘The propor 
of carbon should hence be diminished until there is a minute propor- 
tion of the coh Fete of soda left conse onset in the blocks of crude 
ferruginous so 
Phe quantity “of the mixture that may be put into the calcining: Done 
nace at one time will depend of course on its size: but the amount 
* may be full twice as large as in the Leblanc process, since the BF ip es 
nous soda works more easily than the ordinary soda. 
_ For calcination, the furnace may be similar to that for the clenreous 
orehy 
The treatment in the favtetisert is «ike that for the crudelenicarstie ee 
soda, and the phenomena are nearly the same. The whole sofiens, bee 
coming pasty, and the fluid as the action goes on disengages a yellow 
five: then the action, which has been very brig diminishes as the 
flames become less abundant, and when the mass is homogeneous, it 
is finished. “Iti is then removed immediately from — furnace, er 
so 
~ 
feo 
co 
Whee cold, it is a block in the form of a parallelopiped, 
™ in color and more or less porous, very hard and of considera 
7, sity. The surface has a coppery reflection. In fractu 
. flection oe a crystalline texture, and a greenish and brilliant 
Teflec 
now remains to treat this crude ferruginous soda, so as to 
off a one side the soluble carbonate of soda, and on the other 1 
soluble sulphuret of iron. ‘The method used with the crude calea 
soda would give only bad resulis. In fact, the mass expands 0 
action of witter, becomes very voluminous, difficult to wash, and a 
a liquid containing much caustic soda and also sulphuret of sodium. | 
The washing | wever easy afier a pein mes Raitt whi 
at 
jon.” lt is as follows.—The e ferrugi 
st 
an abundant blichtsly pu 
rulen this 
that in a few hours it is- reduc w hillock of bie powdered $ 
stan i . : 
is change is due to the sbomt oxygen, water and carboni 
acid, acne heat is given. out, which without care may rise even 101g 
ra in which case the vider ish aspe con E 
e of soda with 10 to 
aie But this high helt is 
