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Science Technology and Engineering class notes

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Science Technology and Engineering class notes

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Subido en
13 de julio de 2025
Número de páginas
21
Escrito en
2020/2021
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Notas de lectura
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STE: The Built World notes
(Mostly asynchronous)

Lecture #2: 5/20:
(Notes from powerpoints)
●​ Chapter1 powerpoint:
○​ Mining: placer, underground, surface
○​ Mines waste both solid and liquid
●​ Raw materials usually refer to unprocessed materials that will be turned into a product
●​ Mineable resources:
○​ Ores - mineral and metal. Contains rock that further requires processing
○​ Stones: minerals used directly
●​ A resource is considered: “mineable,” if it can be taken out of the ground using some
method
●​ Mineable resources include:
○​ Ores
○​ Groundwater
○​ Petroleum and natural gas
○​ Mineable resources are often non-reusable
●​ Placer mining: separation of desired materials from streambed deposits
○​ Panning: The use of a pan to sift through sand, rocks and other substances
○​ Hydraulicking: Using a high-pressure water stream to wash streambed gravel
into a box, so that metals can be separated from other substances
●​ Topside activities: Below surface activities:
○​ Drill - Blast - Remove Debris
○​ Drilling uses pneumatic debris
○​ Blasting using explosive debris removal
○​ Using roof bolts - shores walls, in order to help walls from getting slabbed
●​ Certain mines in South Africa are 13,000 feet below sea level
●​ There are multiple levels needed in order to use hoists, worker transport, water
pumping
●​ Temperature rises 1 degree F, for every 300 feet of depth
●​ There are 2 main types of surface mines:
○​ Open pit- Helpful for deep mineral veins, such as Iron (Fe), or Copper (Cu)
○​ Open cast (also called strip mining)- Useful for bedded sedimentary pieces
such as coal
●​ Open pit mining: Open pit mines have terraced designs to prevent wall collapses
●​ Drill - blast-remove debris
●​ For open pit mining: it is bigger and deeper holes for explosives: foot in diameter, and
60 feet deep. There will also be bigger blasts, and larger debris loads. Mine trucks can
carry a load of 400,000 pounds
●​ Open cast (strip) mining:

, ○​ Uses vast tracts of land
○​ Basic process: Grubbing (remove vegetation and top-soil), Layer by layer
stripping of overburden, Perform reclamation of previous strips, Replace spoil
and lay topsoil
●​ Surface mining equipment:
○​ Draglines: largest self-propelled devices on land (30 million pounds)
○​ Shovels: Smaller excavation units that work toward excavating while digging
○​ Bucket wheel excavators: continuous excavating tool used as a rotating bucket
wheel (usually can carve 20-40 feet in diameter, largest can carve out 10,000
cubic yards/hour)
○​ Buckets with capacities as large as 220 cubic yards collect rocks
●​ Mine Wastes, Solid Waste - Gangue:
○​ Gob piles or culm banks: all the slate and rock that is not coal
○​ Chat: dark, sandy material left after lead and zinc have been removed
○​ Slag: glassy or cindery waste from metal smelters
○​ Gyp stacks: Gray or white powdery materials called gypsum

●​ Chapter 1: Out of the earth Ore milling and smelting Iron and steel
○​ Metals need to be recovered from Ore’s that they are found in
○​ Metals are usually combined with Sulfur or Oxygen, when in rock
●​ Smelting: Chemical process to “cook” the metal out of the milled one
●​ Grinding: Make ore lumps into the correct size for smelting
●​ Smelting process:
○​ Ore is roasted to remove S
○​ Ore is heated above melting point with a flux
○​ Conversion: air is blown through matte to burn away from remaining S
●​ SOx + water vapor = H2SO4
●​ Iron is a common metal in earth's crust
●​ Steel is processed iron
●​ Different forms of Iron: Taconite, Pig Iron, Cast Iron, Wrought Iron, Steel, Stainless
Steel
●​ Iron has to be processed in order to be able to be turned into steel
●​ Processed steel is sent to casting machines, and then to rolling mills, in order to be
made into sheets, wires, and bars
●​ Steel production primarily started around 1880, and it was first mass produced when
making the Eiffel Tower in 1889, 1000 feet of it was made
●​ In order to get aluminum, there is a 3 step phase to transfer metals to get there. It
begins with Bauxite, which gets transformed to Alumina, which then gets transferred
to Aluminum

Lecture #3: 5/22:

, ●​ Most info will be in powerpoints. Not as much in the textbook. Regardless, I still need
to read it and take notes
●​ Cannot submit any homework through email. It will have to be submitted through
blackboard when its due
●​ 15 weeks of work, in 7 weeks, so just make sure I pay attention
●​ Over the weekend, the next quiz and video lectures will be posted. Work on that
●​ Team project: Team will be posted on Monday (probably on blackboard)
●​ Oil and gas and power plants will be open next week
●​ Monday, team will be posted
●​ 1 week to post first project milestone
●​ We need to come up with a team agreement of how we are going to/what our roles are
going to be
●​ We need a topic/team name for first project milestone

Lecture #4: 5/27:
(Part 1)
●​ Drilling rigs: temporary and portable. Comprised of a support structure, a drilling
assembly, and a lubrication system
●​ Drill bit - does drilling
●​ Drill string - a pipe connecting drill to surface
●​ Rotary table - motor driven springing platter that turns the kelly
●​ Kelly - special length of pipe gripped by rotary table
●​ Drill collar - weights on the drill bit
●​ Drill assembly fully together will be about 200,000 pounds
●​ Top drives: alternative to rotary table, uses an electric motor
●​ Oil and gas in the environment turn into fossil fuels
●​ Fuels formed eons ago, from decaying plants and animals
●​ Coal, natural gas, and petroleum are all fossil fuels
●​ Fossil fuels are considered “non-renewable,” because we use them faster than they
can naturally be produced
●​ U.S. population is about 5% of the world’s, but the country uses approximately 25%
of the world's commercial energy
●​ Methane+oxygen, will react to carbon dioxide and water vapor
●​ Particles from combustion: mostly fine particles and soots
●​ Chemicals can also absorb in soots
(Part 2)
●​ Motor is the turbine that used mud to move the drill bit
●​ Only the drill bit moves, not entire shaft
●​ Allows for non-vertical drilling
●​ A mud motor (or drilling motor) is a progressibe cavity positive, displacement
(PCPD), pump, placed in the drill string to provide additional power to the bit while
drilling
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