Chemical engineering . he :\d-vancement of Natural Philosophy. Diagonal Concentrating Table. In concentrating mineral particles on a table three forces areemployed, viz.: gravity, reciprocating motion and flow of washwater. Gravity acts in a vertical direction on the mineral particles,forcing them downward, the heavier particles occupying thelower strata. The reciprocating motion of the table is a horizontal force,and tends to bring the particles of ore forward in the direc-tion of the line of reciprocation. The flow of wash water isalso a horizontal force, but transverse to the reciprocatingm
Chemical engineering . he :\d-vancement of Natural Philosophy. Diagonal Concentrating Table. In concentrating mineral particles on a table three forces areemployed, viz.: gravity, reciprocating motion and flow of washwater. Gravity acts in a vertical direction on the mineral particles,forcing them downward, the heavier particles occupying thelower strata. The reciprocating motion of the table is a horizontal force,and tends to bring the particles of ore forward in the direc-tion of the line of reciprocation. The flow of wash water isalso a horizontal force, but transverse to the reciprocatingmotion. Thus, the reciprocating motion and the flow of washwater act in nearly transverse horizontal lines, so that theresultant of these two forces is a line diagonal to both. Con-sequently, the material on the table tends to travel in adiagonal direction. In consequence of this general tendencythe Overstrom concentrating table, built by the Milwaukee, Wis., is built diagonally to the reciprocatiiif^. LIGHT ?. HEAVY . HEAVY FIG. I.—DI.\GR.\M OF ACTION OF TABLE. force and to the flow of wash water as indicated in Fig. i. As a matter of fact the whole material would travel in adiagonal direction only if it was uniform in composition,since, case, each particle would be acted upon withequal force by the two horizontally acting forces. In reality,however, we have a mixture of mineral particles of higherspecific gravity with gangue or silica of lower specific gravity. AiwsT, 1905.] ELECTROCHEMICAL ANT) MI-,TALLLRGICAL IXDUSTRY. 319 The reciprocating motion of the talile has a greater action onthe particles of mineral, which arc closer in proximity to thettble surface than on the lighter gangue or silica which re-mains on top of the mineral. On the other hand, the flow ofwash water produces a greater movement of the gangue orsilica than of the mineral particles, and washes the particlesof the lighter gangue a greater distance in a given time. Ast
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