Hardcore Flashcards
What is the Difference between Mineral Processing and Extractive Metallurgy?
Mineral Processing the field of engineering concerned with the separation of valuable minerals from ores into concentrates usually without chemical change, while Extractive Metallurgy is the field of engineering concerned with the extraction of valuable metals from ores or concentrates usually with chemical change.
Define INDUSTRIAL MINERALS
Non-metallic minerals are the minerals used for industrial purposes for making cement, refractories, glass and ceramics, insulators, fertilizers etc. These minerals are also called industrial minerals. Metals are not extracted from these minerals.
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Define MESH of GRIND
Mesh of grind (m.o.g.) is the term used to designate the size of the grounded product in terms of the percentage of the material passing through a given mesh
Define NATIVE ELEMENTS and give me their examples
Native elements are chemical elements that occur naturally in an uncombined form.
Examples
Fe, Ni, Cu, Ag, Au, S, and C
Define MINERAL PROCESSING
Mineral Beneficiation can be defined as processing of raw minerals to yield marketable products and waste by means of physical or mechanical methods in such a way that the physical and chemical identity of the minerals are not destroyed
Define WORK INDEX
IS THE REPRESENTATION OF THE HARDNESS OF THE MATERIAL OR THE
RESISTANCE OF THE MATERIAL TO BREAKING OR CRUSHING. IT ALSO
REPRESENTS THE AMOUNT OF ENERGY THAT IS NECESSARY TO REDUCE THE MATERIAL INTO A SPECIFIED SIZE FROM A SPECIFIED INITIAL SIZE ALSO.
Define ORE GRINDABILITY
EASE WITH WHICH
MATERIALS CAN BE COMMINUTED
Define FREE CRUSHING
WHEN THE MATERIAL FED TO THE CRUSHER IS AT A SLOW RATE, THE
INDIVIDUAL PARTICLES ARE CRUSHED FREELY. It avoids the production of excessive fines by limiting the number of contacts.
BOND’S LAW
“the work input is proportional to the new
crack tip length produced in particle breakage”
RITTINGER’S LAW
𝑒𝑛𝑒𝑟𝑔𝑦 𝑜𝑓 𝑏𝑟𝑒𝑎𝑘𝑎𝑔𝑒 𝑖𝑠 𝑑𝑖𝑟𝑒𝑐𝑡𝑙𝑦 𝑝𝑟𝑜𝑝𝑜𝑟𝑡𝑖𝑜𝑛𝑎𝑙
𝑡𝑜 𝑡ℎ𝑒 𝑎𝑚𝑜𝑢𝑛𝑡 𝑜𝑓 𝑛𝑒𝑤 𝑠𝑢𝑟𝑓𝑎𝑐𝑒𝑠 𝑝𝑟𝑜𝑑𝑢𝑐𝑒
DEFINE JAW CRUSHER
Consist of two jaw plates set at an acute angle, to
each other which forms crushing chamber.
One jaw is fixed and kept vertical, the other jaw is
a movable or swing jaw and is moved to approach
and recede alternately from the fixed jaw.
DEFINE GYRATORY CRUSHER
They consist of two vertical truncated conical
shells of which the outer hallow conical shell is
stationary and the inner solid conical shell is
made to gyrate.
In a gyratory crusher the inner conical shell is
pointing up and outer conical shell is pointing
down
what is LINERS?
The interior of tumbling mill is lined by replaceable liners usually made of alloy steel but sometimes of rubber. Some types of liners are smooth, shiplap, wave, wedge bar, rib, stepped, osborn, lorain, etc. Liners protect the mill body from wear and damage
Difference between ELASTIC AND FLEXIBLE?
ELASTIC means the mineral will return to their original state after being bent, whereas FLEXIBLE means it can be bent but stays bent.
what is DIAPHANEITY? and what are the 3 cases of DIAPHANEITY?
DIAPHANEITY refers to a mineral’s degree of transparency or the percentage of light that is transmitted through it.
3 CASES:
TRANSPARENT Diaphaneity - If objects can be clearly seen through a mineral,
TRANSLUSCENT Diaphaneity - occurs when objects cannot be clearly seen through a mineral.
OPAQUE Diaphaneity - means the objects cannot be seen at all
Define DEGREE OF LIBERATION
refers to the percentage of the mineral as free
particles in the ore in relation to the total content.l
Define RECOVERY
Recovery in mineral processing refers to the percentage of valuable minerals successfully extracted from the ore during the beneficiation process.
Differences beween PSEUDOMORPHISM, POLYMORPHISM, and ALLOTRIPISM
Pseudomorphism - A mineral can replaced by another mineral without any change in the external from.
Polymorphism - Minerals which contain similar chemical compositions but have different crystal structures resulting to varied physical properties
Allotripism - the property of some chemical elements to
exist in two or more different forms in the same physical
states
Define OVERALL EFFICIENCY
Overall Efficiency is defined as the product of the recovery of oversize material into the screen overflow and the recovery of undersize material into the screen underflow
What is the LAW OF COMMINUTION?
Law of Comminution are concerned with the relationship between energy input and the size of feed and product particles
Define Circulating Load
The quantity of the oversize material fed back to the crusher
Define REDUCTION RATIO
defined as the ratio of the maximum size of the particle in the feed to the maximum size of the particle in the product.
