A N T I M O N Y : ITS HISTORY, CHEMISTRY, MINERALOGY ...
A N T I M O N Y : ITS HISTORY, CHEMISTRY, MINERALOGY ...
A N T I M O N Y : ITS HISTORY, CHEMISTRY, MINERALOGY ...
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156 THE METALLURGY OF ANTIMONY.<br />
The following gives a comparison of the prices of the three kinds<br />
of paint in actual use,* the rates being taken from the Revue des<br />
produits chimiques:—<br />
White lead, 100 kilos, t at 61 fr. . 61 fr.<br />
Oil, 30 „ 140 ,f . . . 42 „<br />
130 kilos, cost 103 „<br />
100 79*20 ,,<br />
Zinc white, 100 kilos, at 82'50 fr. . • . . . 82*50 fr.<br />
Oil, 60 „ 140 ,, •. . " . . 84*0 „<br />
160 kilos, cost 166-50 ,,<br />
100 104*05,,<br />
Antimony white, 100 kilos, at 85 fr. . . . . . 85 fr.<br />
Oil, 50 „ 140 ,, 70 ,,<br />
150 kilos, cost 155*5 ,,<br />
100 „ . . . . . 103*66,,<br />
Experience shows that the following ratio must be taken for painting<br />
a given surface with the three kinds of paint, separately—<br />
Kil. Kil. Kil.<br />
Zn : Sb : Pb=100 : 120 : 130.<br />
But, in order to obtain the same hue for the three cases, experience<br />
shows that it is necessary to apply :—<br />
1 coat of lead at 102-96 fr 102'9frfr.<br />
2 coats of antimony at-124-39 fr 248*78,,<br />
3 „ zinc at 104*05 fr 312*15,,<br />
From these it can be seen that antimony white is a good substitute<br />
for white lead, from the point of view of hygiene and technology.<br />
M. G. Eyvert recommends the following process } :—Carbonate of<br />
soda is melted with a mixture oi antimony and saltpetre or sodium<br />
dioxide, and a solution of sulphate of alumina is used to treat the<br />
waters of lye-washing. Good results can also be obtained by<br />
treating antimony oxide, together with pulverised bauxite, with<br />
silicate of soda, the product being treated with lye-washing and<br />
be solved." Also the Chambre de Commerce de Mon.tlu$on adopted, Oct. 13, 1901,<br />
the proposition to replace the use of lead paint by that of antimony white, and to<br />
encourage the general public to use it from the hygienic point of view. With<br />
regard to this question, consult La Crise die Plowli par Gr. Hyvert, 1901.<br />
* Taken from La Crise du Plomb, p. 28.<br />
t 1 £r. = 9f pence ; 1 kilo. = 2* lbs.<br />
$ French patent, June 18, 1901.