Earth ScienceEarth ScienceGroup 3Group 3

Dinah ManapatDinah Manapat

Neshamah RetuertasNeshamah Retuertas

ManganeseManganese

What is Manganese?What is Manganese?

• MANGANESE (Mn) is a hard but very brittle silver-gray metallic element

• Its atomic number is 25

• Discovered in 1774, manganese is known to have many uses for the human body and for industry

How is Manganese used in Industry?How is Manganese used in Industry?

• manganese is mostly used in the form of

alloys (metal mixtures) and compounds– Steel alloys - Magnesium dioxide– Aluminum alloys - Magnesium sulfate– Copper alloys - Potassium permanganate

Industrial Uses of Industrial Uses of Manganese Manganese

• It is essential in the production of steel

• It is alloyed with steel, aluminum, and copper to increase the metals’ strength, hardness and durability

• Manganese metal is also used as– a brick and ceramic colorant– a chemical oxidizer and catalyst

Industrial Uses of Manganese CompoundsIndustrial Uses of Manganese Compounds

Manganese dioxide (MnO2) is used to:• manufacture ferroalloys• manufacture dry cell batteries• "decolorize" glass • prepare some chemicals, like oxygen & chlorine • dry black paints

Industrial UseIndustrial Use: Manganese Compounds: Manganese Compounds

Manganese sulfate (MnSO4) is used as:• a chemical intermediate • a micronutrient in animal feeds and plant

fertilizers

Potassium permanganate (KMnO4) is used as: • a bactericide and algicide in water and

wastewater treatment• an oxidant in organic chemical synthesis

Sources of ManganeseSources of Manganese

• In the Earth, manganese is found in a number of minerals of different chemical and physical properties, but is never found as a free metal in nature.

• The most important mineral is pyrolusite, because it is the main ore mineral for manganese.

The mining of manganese ores is The mining of manganese ores is usually done in usually done in open pitsopen pits

Manganese MiningManganese Mining • Some ores are upgraded by washing,

and undersized ores can be agglomerated by sintering

• Several processes have been developed for mining seafloor nodules, but they cannot compete economically with the ready exploitation of high-grade terrestrial deposits

Other sources of manganeseOther sources of manganese

• Some manganese is recovered through the reprocessing of scrap metals and steel slag, or the materials left over from the steel-making process

Source CountriesSource Countries

• Over 80% of the known world manganese resources are found in South Africa and Ukraine

• Other important manganese deposits are in China, Australia, Brazil, Gabon, India, and Mexico

Sources of Manganese in the U.S.Sources of Manganese in the U.S.

• The United States imports manganese ore because the manganese resources in the U.S. are relatively low in manganese content per ton of ore.

• Importing these ores is presently more economic than mining them locally.

Price in US$Price in US$

The Price of Manganese for the past five years averages at The Price of Manganese for the past five years averages at about USD 2.50 per kg (fob) about USD 2.50 per kg (fob)

ECONOMICSECONOMICS

• The average price of Manganese for the current year (2010) at FOB* terms is USD 2.50/kg

*does not include cost of shipment from the source port, import taxes, and other attendant costs

Economics of Manganese miningEconomics of Manganese mining

• mining of manganese does not entail very high investment compared to coal and phosphates as mining operations is mostly by Open Pit Mining

PHOSPHATEPHOSPHATE

What is Phosphate?What is Phosphate?

• In mineralogy and geology, phosphate refers to a rock or ore containing phosphate ions

• Phosphates are the naturally occurring form of the element phosphorus, found in many phosphate minerals

What is Phosphate rock?What is Phosphate rock?• It is the product obtained from the mining

and the metallurgical processing of phosphorus-bearing ores

• It can be used either as raw materials in the industrial manufacture of fertilizers or as phosphorus sources for direct application in agriculture

Phosphates & PhosphorusPhosphates & Phosphorus

Inorganic phosphates are mined to obtain phosphorus for use in

agriculture and industry

Industrial Uses of PhosphatesIndustrial Uses of Phosphates

• Phosphoric acid-based chemical polishes are used primarily to polish (brighten) aluminum and aluminum alloys

• Many phosphorus-containing materials are

used as flame-retardants for textiles, plastics, coatings, paper, sealants and mastics

Industrial Uses of PhosphatesIndustrial Uses of Phosphates

• Phosphates and phosphoric acid have many uses in the treatment of potable (drinking) water

• Cleaning solutions with phosphates help clean mildew and stubborn stains on vinyl siding

Agricultural Uses of PhosphorusAgricultural Uses of Phosphorus

• Fertilization of crops comprises the largest proportion of phosphorus used in agriculture

• The amount of fertilizer-phosphorus used in the US has doubled since 1960, and is just slightly under two million tons/year over the last 10 years.

World Sources of PhosphatesWorld Sources of Phosphates

Phoshorite mines are primarily found in

• North America:  USA

• Africa:  Morocco, Senegal, Togo, Tunisia, Egypt, Western Sahara

• Middle East: Israel, Saudi Arabia, Jordan, Iraq• Oceania: Australia, Nauru, Ocean Island,

Makatea

Phosphate sites in the U.S.Phosphate sites in the U.S.

• The largest phosphorite deposits in North America lie in the Bone Valley region of central Florida, the Soda Springs region of Idaho, and the coast of North Carolina

• Smaller deposits are located in Montana, Tennessee, Georgia and South Carolina

Phosphate Mining in FloridaPhosphate Mining in Florida

• Florida provides 75 percent of the phosphorous used by U.S. farmers and 25 percent of world production

• Phosphate deposits in Florida are among the richest and most accessible in the world

Phosphates: Status of SupplyPhosphates: Status of Supply

• In 2007, at the current rate of consumption, the supply of phosphorus was estimated to run out in 345 years.

• Scientists are now claiming that a "Peak Phosphorus" will occur in 30 years and that "At current rates, reserves will be depleted in the next 50 to 100 years."

Ecology of PhosphatesEcology of Phosphates

• Phosphate deposits can contain significant amounts of naturally occurring heavy metals

• Mining operations processing phosphate rock can leave tailings piles containing elevated levels of cadmiun, lead, nickel, copper, chromium, and uranium

Ecology of PhosphatesEcology of Phosphates……

• These waste products, if not carefully managed, can leach heavy metals into groundwater or nearby estuaries.

• Uptake of these substances by plants and marine life can lead to concentration of toxic heavy metals in food products

Phosphate EcologyPhosphate Ecology … …

Fertilizing crops with a blend of high-nitrogen fertilizer and chicken litter increases crop yields and reduces the potential for phosphorus runoff

PHOSPHATE MINING In NauruPHOSPHATE MINING In Nauru

Phosphate mining…Phosphate mining…

• Phosphate ore is found from 15 to 50 feet below the ground

• Huge cranes remove the top layer of soil, and scoop up the phosphate matrix

Phosphate ore must be mixed with Phosphate ore must be mixed with sulfuric acidsulfuric acid to to create create phosphoric acidphosphoric acid that is used in fertilizer that is used in fertilizer

• Pilot programs show that phosphogypsum, the slightly radioactive by-product, may be a cost-effective alternative to fill material used for building roads.

Phosphate mining …Phosphate mining …

• Reclamation efforts developed for phosphate mines over the past 30 years have been successful

• Thousands of acres have been donated to local governments for parks

Economics of Phosphate miningEconomics of Phosphate mining

COALCOAL

What is coal?What is coal?

• Coal is a readily combustible black or brownish-black sedimentary rock normally occurring in rock strata in layers or veins called coal beds

• The harder forms can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure

COAL : compositionCOAL : composition

• Coal is composed primarily of carbon (C) along with variable quantities of other elements, chiefly sulfur (S), hydrogen (H), oxygen (O), and nitrogen (N)

Uses of CoalUses of Coal

• Coal is primarily used as a solid fuel to produce electricity and heat through combustion 

• Steel and cement industries use coal as a fuel for extraction of iron from iron ore and for cement production

Uses of Coal…Uses of Coal…

• Coal can also be converted by several different processes (liquefaction) into liquid fuels such as gasoline or diesel

• Coal liquefaction is one of the backstop technologies that could potentially limit escalation of oil prices and mitigate the effects of transportation energy shortage.

World coal reservesWorld coal reserves

• Coal has the most widely distributed reserves of the three fossil fuels

• Coal is mined in over 100 countries, and on all continents except Antarctica

• The largest coal reserves are found in the USA, Russia, Australia, China, India and South Africa

The United States has the world's largest The United States has the world's largest

coal reserves.coal reserves.

A coal mine

in Wyoming

Coal MineCoal Mine

Coal ReservesCoal Reserves

• The United States Energy Information Administration gives world reserves as 930 billion short tons as of 2006. At the current extraction rate, this would last 132 years.

• However, the rate of coal consumption is annually increasing at 2-3% per year and, setting the growth rate to 2.5% yields an exponential depletion time of 56 years (in 2065)

Production trendsProduction trends

• In 2006, China was the top producer of coal with 38% share followed by the USA and India, according to the British Geological Survey.

Environmental Effects of CoalEnvironmental Effects of Coal

• There are a number of adverse environmental effects of coal mining and burning, specially in power stations 

Coal-fired power plantsCoal-fired power plants

• are one of the largest sources of human-caused background radiation exposure

• emit mercury, selenium, and arsenic which are harmful to human health and the environment

• shorten nearly 24,000 lives a year in the U.S., including 2,800 from lung cancer

Environmental effects of coal Environmental effects of coal

burningburning • Millions of tons of waste products that Millions of tons of waste products that

contain mercury and other heavy metalscontain mercury and other heavy metals• Acid rain (from high sulfur coal)Acid rain (from high sulfur coal)• Interference with groundwater and water Interference with groundwater and water

table levelstable levels• Contamination of land and waterwaysContamination of land and waterways• Destruction of homes from fly ash spills Destruction of homes from fly ash spills • Dust nuisanceDust nuisance

Economics of CoalEconomics of Coal

References:

http://en.wikipedia.org/wiki/Coal_mining http://www.eia.doe.gov/cneaf/coal/page/acr/table31.html http://en.wikipedia.org/wiki/Phosphate http://www.baysoundings.com/sum02/behind.html http://www.infomine.com/commodities/manganese.asp http://www.mbendi.com/indy/ming/mang/p0005.htm The World Book Multimedia Encyclopedia, 1996 Encyclopedia Britannica Ultimate Reference Suite

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