"This ore is mined from a quartz vein which is refined by small seams of graphitic clay material, and the walls of the vein consist of a sort of graphitic shaley material. The above graphitic materials break down under treatment into a rather peculiar clay which was called primary colloidal slime. The milling process in use consists of stamp milling followed by the separation into sand and primary slime in Dorr Duplex Classifiers. The primary slime overflow from these classifiers, which is all practically thru 220 mesh, is thickened and treated by flotation. Normally and with a good supply of fresh water, flotation is satisfactory, but, in winter, when they were short of water and had to reclaim water from the mill pulp, using lime to settle it, the bad effect of the foul water on flotation was very marked. So long as they could keep the primary clay unflocculated, flotation was satisfactory but the pulp was sensitive and the least impurity in the water flocculated the slime immediately. With unflocculated pulp it was possible for them to flow off the tops of the thickeners a small quantity of colloidal clay. There was insufficient thickner capacity any way, and with flocculated pulp the overflowing colloidal clay then entangled and carried over with it rich sulfide minerals...The problem was to improve the flotation extraction when using neutral water and if possible to find out some means of obtaining satisfactory results when using reclaimed foul water which contained of course lime which had been added for settlement purposes"--Milling Problem at the Plant of chosen Corporation Taiyudo Chosen (Korea), pages 15-16.||"Smelters are handicapped in the Japanese Empire in that there must be no damage done, by smelter gases, to the farm lands. The stack at this smelter is one of the highest in the world and is located out on a point of land extending into the sea so that no matter which way the wind blows, the smelter fumers are carried out over the water for 85% of the time. Most smelters have installed sulfuric acid plants and also are equipped with nitrogen fixation apparatus so that they are able to turn out sulfate of ammonia as a by-product. Modern smelting equipment is used thruout excepting at this particular plant they use the old style Japanese type of converter for removing the sulfur from the matte"--Various Mining Activities in Japan, page 24.


Materials Science and Engineering

Degree Name

Professional Degree in Metallurgical Engineering


Missouri School of Mines and Metallurgy

Publication Date



iv, 38 pages

Geographic Coverage



© 1931 Van Hoose Smith, All rights reserved.

Document Type

Thesis - Open Access

File Type




Library of Congress Subject Headings

Mines and mineral resources -- Japan
Milling machinery -- Testing
Mines and mineral resources -- Korea
Smelting furnaces

Thesis Number

T 629

Print OCLC #


Electronic OCLC #


Included in

Metallurgy Commons