718 



GEOLOGT AND MINING INDUSTRY OF LEADYILLE. 



Analysis XXXVI. Fumes from Bartlett filter — Contintied. 

 Itational. 



Portion soluble i 



Oxychlorido of lead 



Oxy bromide of lead 



Oxyiodide of lead 



Protosnlphate of iron... 

 Protochloride of iron . . . 

 Protobromide of iron ... 



Protoiodide of iron 



Salphate of zinc 



Chloride of zinc 



Bromide of zmc 



Iodide of zinc 



Snlphate of manganese. 



Snlphate of alumina 



Chloride of alumininm.. 



Chloride of calcium 



Bromide of calcium 



Chloride of magnesium. 

 Bromide of magnesium. 

 Chloride of potassium . . 



Chloride of sodmm 



■Water 



Total . 



Portion soluble in acids. 



1. 203400 

 1. 704600 

 I. 348340 

 I. 057000 

 I. 537200 

 1. 184300 

 I. 012400 

 I. 060300 

 I. 623200 

 1. 176000 

 I. 007660 

 Trace 

 Trace 

 1. 446600 

 I. 286380 

 1. 104000 

 I. 680670 

 I. 020240 

 I. 269930 

 ). 423930 

 ). 912500 



Portion soluble in acids — Continued. 



Oxide of lead 28. 176900 



Phosphate of lead , 11.641800 



Sulphide of lead I 18.899160 



Chloride of lead j 6.341150 ■ 



Bromide of lead 0. 750000 



Iodide of lead ! 0.032460 



Chloride of .silver 1 0.017890 



Bromide of silver I o. 002000 



loilide of silver ! o. 000150 



Gold Faint trace 



Protosulphide of iron 



Sulphide of zinc 



Sulphide of manganese 



Sulphide of cadmium 



Arsenions acid 



Protoxide of antimony 



Oxide of tin (SnOj) 



Selenioas and tellurons acids . 



Alumina 



Carbonate of lime 



Carbonate of magnesia 



Caustic magnesia 



Indium, thallium, new metal . 



Total . 



Portion insolublg in acids. 



Silica 



Titanic acid 



Oxide of lead 



Oxide of zinc 



Peroxide of iron 



Alnmina 



Lime 



Magnesia 



Potash 



Soda 



MnOj, AsOi, SnO», SbjOi . 

 Carbon (soot) 



Total 



Portion soluble in water... 

 Portion soluble in acids — 

 Portion insoluble in acids. 



6. 357000 

 0. 491960 



0. 001500 



1. 470000 

 0. 250000 

 0. 203850 



Traces 



0. 22C200 

 4. 853200 

 1. 760300 



1. 008490 

 Traces 



Discussion. — The combinations iu which lead exists in these fumes and their vola- 

 tility is most remarkable. To appreciate this fully one must remember that the fumes 

 were filtered at a distance of nearly 200 feet from the blast furnace. The above 

 analysis shows, besides 9 per cent, of chloro-bromoiodide of lead, 18 per cent, of 

 sulphides iu combination with the chloro bromo-iodides, and 11 to 12 per cent, of 

 phosphate of lead, proving a most surprising volatility for the two latter combinations. 

 The percentage of lead as oxide is relatively low as compared with other dusts. It is most 

 worthy of remark that the iron, manganese, zinc, and cadmium must be in the state 

 of sulphides and al.so have an unusual degree of volatility. That these fumes should 

 be richer in arsenions acid than the ordinary chamber dust might have been expected, 

 but that they should have carried off tin and titanic acid is most remarkable. Silica 

 being combined with the lead as silicate of lead shows that this combination is al>o 

 volatile. 



