a. In crushing practice, the obstruction of the receiving opening by two or more pieces wedged together, each of which could easily pass through. Nelson
b. Formation of arches of keyed or jammed particles across the direction of flow (of rock through apertures or of small particles through filter pores). Pryor, 3
c. Arching of the charge across the shaft in a blast furnace or cupola.
d. Premature solidification of metal across a mold section before the metal below or beyond solidifies. ASM, 1
e. Solidification of slag within the cupola at or just above the tuyeres. ASM, 1
f. Welding or mechanical locking of the charge in a downfeed melting or smelting furnace. ASM, 1
g. Closing of a section of a drill hole by loose blocks of rock or by squeezing of plastic shale, etc.
Source:
Dictionary of Mining, Mineral, and Related Terms












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