Iron-Ore Concentration. No. 4. [Volume: 8, Issue: 4, 1889, pp. 236-240]

240

UNITED STATES ASSOCIATION OF

[VOL. 8,

Meshes to one inch. Pounds refused, Per cent. of total.
2 to 6 5} 30.43
6 1 8.69
10 1 ' 5.80
16 1i 7.25
20 14 7.25
50 21 15.94
No. 60 and smaller, 44 24.64
Total,.... 17- 100.00
We may therefore expect that in crushing ores to pass a certain
mesh of screen, that a very large proportion will be finer than the
size of mesh, and that for each particular ore the degree of fineness
to which it is to be reduced, and the mechanism employed for such
reduction, must be a subject for special investigation and experiment.
While the finely comminuted character of the results of the two
tests above noted may occasion surprise, we believe equal surprise
would follow the drying and screening of much of the fine ore now
fed to blast-furnaces just as it comes from the mines.
In our next JOURNAL we hope to give some results of the new or
remodelled concentrating plants to which reference has been made.
THE EDITOR.
THE Report of Mr. J. S. Jeans, the Secretary of the British
Iron Trade Association, for 1888, showed the production of coal, ironore, and iron and steel in the United Kingdom in 1888, with other
valuable information, compared with the two previous years.
Products-gross tons. 1888. 1887. 1886.
Coal.......................... 169,935,219 162,119,812 157,518,482
Iron-ore.......................... 14,166,000 13,098,041 14,110,013
Pig-iron............................ 7,898,634 7,441,927 6,870,665
Stocks of pig-iron; Dec. 31st. 2,588,708 2,778,684 2,491,506
Puddled bar..................... 2,(31,473 1,701,312 1,616,701
Bessemer steel ingots............ 2,012,794 2,064,403 1,570,520
Open-hearth steel ingots....... 1,292,742 981,104 694,150
Bessemer steel rails............. 979,083 1,021,847 730,343
Tonnage of ships launched... 904,329 577,327 481,233
Exports of iron and steel...... 3,966,984 4,143,028 3,388,494