BLAST-FURNACE SLAG
 1288 MINERALS YEARBOOK, 1941

Sand and gravel imported for consumption in the United States, 1940—41,
by classes
and count ries
Country
Glass sand' Value
Other sand' Value
Gravel
Value
Total


Value
1940
North America: Canada.~...  249,829 $78, 088 175,140 $25, 313 424,969 $103,
401
Europe:
  Belgium 4,337 $8, 722 336 750   4,673. 9,472
  Denmark  2,106 360   2,106 360
  France.  101 480   101 480
  Netherlands  814 327   814 327
  Norway  224 25   224 25
  United KIngdom  10 754 10 250 418 373 11 172 10 623
Asla:Japan  (3) 9   (~' ) 9
Oceania Australia  6 61   6 61
4,337
8,722
264,170
90,350
175,558
25,686
444,065
124,758
1941.

(Ian.-Sept.)
North America Canada 159 709 69 404 98,748 15 387 258,457 84,791
Europe: United Kingdom - 6,518 3,820  6,518 3,820
Oceania: Australia 1 5  1 5

                      166,228 73,229 98,748 15,387 264,976 88,616


 ' Classification reads "Sand contaIning 95 percent silica and not more than
0.6 percent oxide of Iron and suitable for manufacture of glass."
 ' Classification reads "Sand, n. 5. p. f."
' Less than 1 ton

Sand and gravel exported from the United States, 1937—41

Year

1937

1938

i939~               

 ' Classification reads "Gravel and building stone."

' Not separately classified.

 Continuing the policy inaugurated in 1938, the National Slag Association
conducted a canvass of 30 companies (64 plants) that prepare blast-furnace
slag for commercial use. The total output for 1941 was 14,678,266 short tons
valued at $11,064,102. Of this total, 84 percent was air-cooled and screened,
5 percent air-cooled and unscreened, and the remainder granulated. Sales
of screened and air-cooled slag were 52 percent greater in 1941 than in 1940,
and the average value per ton was 2 cents lower.
 About 73 percent of all slag processed is treated in Ohio, Alabama, and
Pennsylvania; however, it is marketed in all States east of the Mississippi
River except several New England States too far removed from sources of supply
to permit economic utilization.
 Air-cooled slag is used principally in the construction and mamtenance of
highways, as well as in airport runways, parkinglots, and building construction
and as railway ballast. It is used quite extensively as roofing aggregate
and in the manufacture of mineral wool. Granulated slag is used primarily
as fill material and as an ingredient of