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       CODE: 558.685-014 Buy the DOT:Download/CD-ROM
TITLE(s): BALL-MILL OPERATOR (chemical)
Tends ball mill and auxiliary equipment to produce sodium salicylate for use in production of
salicylic acid: Opens valves to transfer specified quantities of sodium hydroxide and phenol
solutions to tank, and starts agitators to mix solutions to form mixture of sodium phenate and
water. Drains mixture into ball mill (closed metal tank), opens exhaust valve, and starts heaters to
evaporate water from sodium phenate. Observes moisture indicators to determine when water has been
removed from sodium phenate. Pumps cold water into jacket of ball mill to contract mill walls
sufficiently to loosen pulpy sodium phenate. Heats ball mill to specified temperature, increases
pressure in ball mill to required level, and pumps carbon dioxide into ball mill to change sodium
phenate to sodium salicylate. Opens vents to rid sodium salicylate of excess carbon dioxide. Pumps
specified quantity of water into ball mill to dissolve sodium salicylate, and pumps sodium
salicylate solution into tanks for further processing into salicylic acid.
GOE: 06.04.11 STRENGTH: L GED: R3 M2 L2 SVP: 3 DLU: 77
ONET CROSSWALK: 92938 Chemical Equipment Tenders
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