- المجال: Government; Labor
- Number of terms: 77176
- Number of blossaries: 0
- Company Profile:
A professional who tends ball mill that grinds ore and classifier that separates coarse from fine particles. Respnsibilities include:
* Turns pump valves and moves conveyor-control levers to feed soda ash, starch, lime, water, ore, and other materials into ball mill to make slurry.
* Adds chemical reagent to slurry that causes fine particles to float and enables classifier to separate fine from coarse particles and to return coarse ones to mill for regrinding.
* Obtains sample of slurry in bucket from mill and classifier.
* Weighs sample and calculates density of mixture or titrates sample to measure alkalinity.
* May examine ore tactually or observe its color to ascertain size of particles.
* May set automatic device to regulate amount of ore passing on conveyor belt to ball mill.
Industry:Professional careers
A professional who assists recovery operator in operating kiln, ball mill, and conveyor system to recover soluble soda and alumina from waste materials. Respnsibilities include:
* Moves controls to adjust feeds to rotary kiln and ball mill and to regulate operation of dust-collection equipment.
* Reads and records tank levels and slurry and soda ash temperatures.
* Collects and weighs batches of slurry to determine density.
* Measures oxygen content of flue gases, using gas analyzer.
* Keeps operating log.
* Turns valves to supply water to kiln trunnions and water-cooled bearings.
* Lubricates valves and adjusts packing glands to prevent leaks.
* Cleans cooler grates, using handtools.
* Performs other duties as described under helper master title.
Industry:Professional careers
A professional who tends battery of digester vessels that dissolve bauxite in plant liquor. Respnsibilities include:
* Turns valves on pumps to transfer liquor and bauxite slurry through heaters into digester vessels.
* Turns valves to inject milk of lime into vessels.
* Adjusts pumps and valves to circulate cleaning solution through process lines.
* Collects samples of slurry and alumina solution for laboratory analysis.
* Keeps log of operations.
Industry:Professional careers
A professional who assists tank-house operator in setting up electrolytic copper-refining tanks by performing any combination of following duties. Respnsibilities include:
* Cuts, strips, and trims copper sheets from starting blanks, using knife, pincers, and power shear.
* Places sheets in machine to clean and coat them with oil solution.
* Cinches or rivets loop strips to sheets, using looping machine.
* Straightens starter sheet blanks, using paddle or sledgehammer.
* Lifts and hangs starter sheets on electrical suspension bars in tanks.
* Guides monorail crane operator in positioning or removing anodes and coated starting plates.
* Scrapes and flushes out tanks, using scraping tools and water hose.
* May be designated according to function performed as Grease-Machine Worker; Looper; Sheet Hanger; Stripper.
* Performs other duties as described under helper master title.
Industry:Professional careers
A professional who operates rotary kiln, ball mill and conveying equipment to recover soluble soda and alumina from waste materials. Respnsibilities include:
* Moves lever and switch controls to start and regulate rotation speed of kiln.
* Moves controls to maintain specified temperatures throughout kiln and feed rate of kiln.
* Catches samples of slurry clinker from kiln, and observes discharge of slurry at sample points to ensure specified burning.
* Moves controls of cooling air fan, cooler exhaust fan, and air dampers to adjust temperature of grate cooler and airflows to burners.
* Moves controls and adjusts feed valves to start conveyor and bucket elevator system and to transport calcined clinker, bauxite, and soda ash into ball mill.
* Regulates valves and pumps to transfer slurry from ball mill into digestion tanks and to supply water to kiln trunnions and water-cooled bearings.
* Keeps operating log.
* Replaces charts in automatic recording devices.
Industry:Professional careers
A professional who tends tumble drums, screens, and balance scales to test hardness of baked taconite pellets. Respnsibilities include:
* Reads schedule to obtain specifications, such as furnace from which pellets are to be drawn and time of withdrawal, and notifies sampling personnel to prepare sample pellets.
* Pours sample over screen, and weighs screened pellets on balance scale.
* Dumps pellets into drum, and starts drum rotating for specified number of turns.
* Screens tumbled pellets, and weighs them to determine weight loss from tumbling.
* Reads conversion chart to obtain hardness number.
* Records hardness number of samples tested.
* May clean work area, using broom, shovel, and water hose.
Industry:Professional careers
A professional who tends machines that drain, filter, dry, crush, and package slime from electrolytic tanks, preparatory to recovery of valuable metals, such as gold, silver, platinum, and vanadium. Respnsibilities include:
* Pulls lever to drain and filter slime from electrolytic tanks into storage tank.
* Drains slime into machine to subject it to heat and pressure to remove moisture.
* Starts conveyor to transport dry slime to automatic grinder machine.
* Observes flow of slime from grinder into container.
* Weighs container, and marks weight on container and tally sheet.
* Inspects tanks for leaks and other defects.
* Collects samples of liquids for analysis.
* May tend machine which dries and presses slime into cakes for shipment.
* May transfer electrolyte from one tank to another by passing it through intermediate steam-heated tank, offsetting evaporation by adding hot water.
* May smooth surface of starting sheets with sandpaper to remove pits and scratches.
Industry:Professional careers
A professional who tends crushers, ovens, and screens to test samples of ore. Respnsibilities include:
* Starts crusher to pulverize ore.
* Removes ore from crusher and places it in oven to dry.
* Sends portion of sample to laboratory for chemical analysis.
* Places sample in vibrator containing magnets and water.
* Starts vibrator to separate magnetic content of ore from impurities.
* Drains water from vibrator and weighs magnetic remainder.
* Pours ore sample through series of vibrating screens of different size openings to separate ore samples.
* Weighs and records each size of ore.
* Records number of tests performed.
* May collect ore samples from various sites in plant or mine, and record origin of samples.
* May perform chemical sedimentation or hardness tests on samples.
Industry:Professional careers
A professional who operates machine equipped with door jack and coke guide to remove doors from discharge end of coke ovens and guide discharged coke from oven to quenching car. Respnsibilities include:
* Drives machine along rails to designated oven.
* Moves levers to hook machine arm onto door and remove it from oven, and to position frame which guides discharged coke from oven into quenching cars.
* Signals pusher operator to discharge coke from oven.
* Cleans fire clay and tars from door and jamb, using chisel bar.
* Gathers dry clay and residue with shovel and wheelbarrow, and dumps it into hopper.
* Replaces door.
* May manually hook coke-guide hangers to oven and drop apron to oven sill.
* May steam clean door machine.
Industry:Professional careers
A professional who drives electric car to haul hot coke from oven to quenching station and wharf. Respnsibilities include:
* Positions dumpcar coupled to electric car below coke guide on designated oven.
* Signals pusher operator to discharge coke.
* Moves car forward to distribute coke evenly in car.
* Transports coke to quenching station, and starts equipment that sprays hot coke with measured amount of water.
* Moves car to wharf, and turns air valve to open gates on car and dump coke on wharf.
* Cleans cab and cab windows, using cleaning agents, broom, and brushes.
Industry:Professional careers
