Sand Making Machine Manufacture in China

EXAMPLE XIV In a series of runs, rich gold bronze feed (-100 mesh atomized brass powder) Was dry-milled with fine TFE powder, to produce gold bronze flakes, in a productionscale ball-mill operated under production conditions. The mill was 3 feet in diameter by 10 feet long; it contained 5,000 lb. of diameter steel balls and was rotated continuously at 36 r.p.m.,sand manufacturing plant with continuous feed and product removal. In operation, air circulated through the mill removed flakes; fine flakes were delivered to a product collector, and coarse flakes were classified out and returned to the mill.

At start-up, the mill was charged with 200 lb. of the atomized brass powder and 810 g. of TFE powder, and run for one hour without air circulation, in accordance with usual practice for beginning operation with raw feed and :an empty mill. Air circulation, classification and product removal were then started, while the mill was continuously rotated; operation was thereafter continued for 7 /2 hours while the mill was fed at a rate of 20 lb./hr. of brass powder and 81 g./hr. of TFE powder. A total of 93 'lb. of flake product was collected. The unfinished material was left in the mill.

Operation of the mill was resumed the following day for 11 hours, with a feed rate of about 30 lb./hr. of brass powder and 60 g./hr. of TFE powder; 309 'lb. of product flake was collected. On a subsequent day, operation was resumed for 11 /2 hours with a feed rate of 30 lb./hr. of brass powder and 90 g./hr. TFE powder; 272 1b. of product flake was collected. Thereafter on the same day) operation was again resumed for 17 /2 hours with a feed rate of 30 lb./hr. brass powder and g./l1r. TFE powder; 433 lb. of product flake was collected, and 469 lb. of unfinished material was removed from the mill for use as initial charge in a subsequent run.

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