- 업종: Government; Labor
- Number of terms: 77176
- Number of blossaries: 0
- Company Profile:
A professional who tends equipment that separates gold or silver from ground ore by mercury amalgamation process, using either of following methods. Respnsibilities include:
* (1) Turns valves or opens gates to regulate flow of ore and water over mercury-coated plates.
* Adjusts angle of plates to facilitate collection of amalgam.
* Scrapes accumulated amalgam from plates and coats plates with mercury.
* (2) Turns valves or opens gates to charge ground ore and mercury into rotating-type barrels or agitating-type tanks.
* Starts equipment and observes accumulation of amalgam.
* Discharges or drains barrel or tank to recover gold or silver amalgam.
Industry:Professional careers
A professional who tends equipment that separates crushed ore into sands (coarse particles) and slimes (fine particles), preparatory to concentration of metal. Respnsibilities include:
* Starts equipment, and regulates flow of crushed ore, water, and flotation reagent into classifiers which separate coarse particles by raking mechanism or swirling action of water while fine particles are carried off in overflow.
* Observes meter indicating alkalinity of slime, and adds lime solution, as necessary.
* Removes sand to prevent clogging by flushing or pulling lever on classifier to dump it.
* May lubricate machines.
* May replace defective parts, using handtools.
* May be designated according to type of classifier used as Cone-Classifier Tender.
Industry:Professional careers
A professional who tends battery of condenser tubes in which gaseous mercury is condensed into liquid mercury. Respnsibilities include:
* Places water-filled buckets at base of each tube to collect liquid mercury.
* Removes buckets as mercury accumulates, pours off water, and strains mercury into steel flask.
* Pours mixture of water, mercury, and dust onto sloping table, adds quicklime, and stirs mixture with hoe to separate remaining mercury from sediment.
Industry:Professional careers
A professional who tends equipment that washes taconite ore dust collected from air. Respnsibilities include:
* Starts dust collection equipment and turns valves to adjust pressure to required level as indicated by manometer.
* Examines parts of dust collector, such as pipes, nozzles, strainers, and collection surfaces, for pluggings, breaks, leaks, and residue.
* Closes water valves and stops pumps to permit cleaning and repairing of equipment.
* Washes residue from collection surfaces, pumps, hoppers, and fans, using water hose.
* Turns threaded water nozzles into fittings to change type of nozzle or to replace defective ones.
* Removes mesh strainers and cleans them, using airhose.
* Tightens glands on pumps and valves, using wrenches.
* May record gauge readings.
* May tend equipment that extracts carbon dust from air.
Industry:Professional careers
A professional who tends flotation machines that separate metals from gangue of ore. Respnsibilities include:
* Turns valves to regulate flow of pulp and reagents into cells.
* Turns valves to introduce compressed air into cells to agitate mixture and to promote froth that carries metallic particles to surface of liquid and deposits them through side opening of cell into launders.
* May tend cells that are agitated either mechanically or by air, or combination of both.
* May lubricate and repair machines.
* May be designated according to metal separated as Copper-Flotation Operator; Molybdenum-Flotation Operator.
Industry:Professional careers
A professional who tends gas-fired kettle that removes gold, silver, and copper from black mud. Respnsibilities include:
* Shovels mud into kettle, and turns valve to admit acid until mud is covered.
* Rakes mud to dissolve gold and silver.
* Ladles solution into water-filled settling tank to precipitate gold and silver compounds.
* Removes precipitates and adds reagents to change their chemical composition.
* Heats precipitates in cupola furnace to extract gold and silver.
* Ladles remaining mud into tank filled with water and admits steam to dissolve copper.
Industry:Professional careers
A professional who tends gas-fired evaporator that recovers gold, platinum, and palladium from electrolyte used in gold-refining tanks. Respnsibilities include:
* Adds liquid and gaseous reagents to electrolyte and heats it in evaporator to precipitate metals.
* Separates each precipitate from solution, using porcelain filters.
* Heats platinum and palladium precipitates in crucible furnaces to make sponge. Breaks up sponge preparatory to shipment, using pliers.
Industry:Professional careers
A professional who tends equipment that precipitates gold or silver from cyanide solution. Respnsibilities include:
* Packs zinc shavings into compartments of zinc boxes.
* Regulates flow of solution through boxes where gold or silver precipitates on zinc.
* Shuts off flow of solution and turns on water.
* Agitates shavings to remove precipitate.
* Pulls plugs and draws off slime (precipitate and water) from boxes.
* Treats slime with sulfuric acid.
* Turns slime solution into filter press that filters solution and removes precipitate residue.
* Washes precipitate with water under pressure, and dries it with compressed air.
Industry:Professional careers
A professional who tends tanks that precipitate uranium oxide from solution of uranium nitrate. Respnsibilities include:
* Moves pump controls and turns valves to regulate flow of uranium nitrate solution into precipitation tank.
* Starts tank agitator and turns valve to feed specified amount of ammonia into tank.
* Dumps specified amount of magnesium oxide from bags into tank.
* Turns off agitator after specified period to allow uranium oxide to settle.
* Pumps tank underflow to automatic drier and tank overflow to thickener.
Industry:Professional careers
A professional who tends mechanical agitator that mixes chemicals for use in separating metallic particles from ore gangue. Respnsibilities include:
* Turns valves to pour specified amounts of chemical solutions from storage tanks into mixing tank.
* Weighs chemical compounds on scales, and dumps chemicals into mixing tanks, using forklift truck.
* Starts agitator to blend mixture.
* Turns valves on pumps to transfer mixture to storage tank.
* May weigh steel rods and balls and transport them to mills, using air-powered dinkey engine.
* May open chute door of storage tank to charge ball mills.
Industry:Professional careers
