Recovery of round metal granules from process sludge

Details Recovery of round metal granules from process sludge Recovery of round metal granules from process sludge

1978-08-25

1980-01-08

Lazarus, Richard B.

Solid material comminution or disintegration

Processes

With classifying or separating of material

241 29, 241 76, B02C 2300

Patent

active

041824989

ABSTRACT:
Metal beads, e.g., magnesium beads, or Mg alloy beads, having a high degree of rotundity, and having a thin coating of sludge or slag ingredients, are recovered from entrapment in a friable contiguous material of sludge or slag material by (a) a primary milling of the friable matrix in a hammer mill or impact mill, (b) screening the material to collect the desired particle sizes, (c) attriting the material in a secondary milling operation to further, and gently, grind sludge material from around the beads, and (d) separating the rotund beads from the pulverized matrix material by using a shape-classifier, such as a slanted shaker table. The material may be treated beforehand by melting the metal-containing sludge or slag, adding a flux or emulsifier material with stirring to cause dispersion of the metal into a relatively narrow particle size range and then freezing the molten mixture. The invention is especially useful in the case of Mg beads, since Mg beads are malleable and pyrophoric.

REFERENCES:
patent: 1976974 (1934-10-01), Whiteside

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