This website uses cookies to ensure you have the best experience. Learn more

Global Issues In The Environment And Extraction Of Metals

3684 words - 15 pages

Year 10 Research AssignmentGlobal IssuesBy Welton ChanYear 10 ScienceExplain the significance of ozone to life on EarthOzone is a gas that naturally occurs in the stratosphere. It acts as a shield and is able to absorb most of the Sun's harmful ultraviolet radiation before it reaches the Earth's surface. Harmful ultraviolet radiation can increase the likelihood of skin cancers and eye damage, and slow down photosynthesis. By having ozone, it protects living things from the harmful high-energy radiation from the Sun.What have humans done to damage it?Humans have damaged ozone by using Chlorofluorocarbons. Chlorofluorocarbons are greenhouse gases that destroy ozone. Chlorofluorocarbons are ...view middle of the document...

SO2 is easier to dispose of safely than CO2.Realisation of the values in ores by high temperature routes are well above those experienced in mineral separation/leach routes.DisadvantagesPyrometallurgical process routes cannot be developed to commercial operations in a small scale.Toxic emissions are still produced.High equipment costs.More energy is used.Operations are complicated.The second basic way of treating metallic ore is electrometallurgy. In this method, the metals are processed through methods such as electrolysis. In electrolysis, a voltage is applied to a molten sample or solution of the ore and the positive metal ions move to the negative electrode. When it gets there, the ion is forced to take back its outer-shell electrons to form metal atoms that then plate the electrode.AdvantagesUseful when high purity metal is needed. There is a high quality after the first remelting.Simple and inexpensive equipmentDecreased energy consumptionProcess is less complicatedDisadvantagesOnly works well with minerals that are soluble in aqueous solutionsAs electricity is used, there are safety risksTime consumingThe third basic way of treating metallic ores is hydrometallurgy. It is the process of extracting metals at ordinary temperature through wet processes such as leaching ores with liquids. This results in the solution of a metal and its subsequent recovery.AdvantagesAs the concentration of a desired metal becomes less in the ores mined, the wet processing of the more valuable metal ores becomes more feasible.Hydrometallurgical processes present sulphur as relatively stable sulfate and elemental sulfur rather than producing SO2 emissions and are relatively power efficient.Hydrometallurgical processes can handle a range of impurities.Hydrometallurgy plants can be smaller. The economics of a typical nickel smelter requires a capacity over 50,000 tonnes nickel per annum, whereas a hydrometallurgy plant can be as small as 10,000 tonnes nickel per annum.Due to project economics and plant capacity, hydrometallurgy plants can be built at the mining site, improving efficiencies and reducing transportation costs.DisadvantagesEach material used in the process must be recovered, recycled, or disposed at some point in the process.The recovery rate of precious metals is lowProduction costs are higher than with pyrometallurgical refiningCompare the amount of energy required to extract aluminium from its ore with the amount required to recycle aluminiumRecycling from waste aluminium requires only 5 percent of the energy required to extract it (i.e. to turn bauxite to aluminium). This significantly reduces greenhouse gas emissions emitted by power stations. In addition, every tonne of scrap aluminium that is recycled saves four to five tonnes of ore.For each of the following renewable energy sources explain how each works and at least two pros and cons of each methodSolar energy: solar pondsSolar heat can be stored in ponds full of rocks, oil or water. A...

Find Another Essay On Global Issues In The Environment And Extraction Of Metals

Global Trends in the Environment Essay

1006 words - 4 pages . In 2005, 30 percent of global power generation investments were in renewable energy (Bozen, Campbell, and Lindstrand, 2007). Environmental issues first came to the forefront in 1970 when the first Earth Day was celebrated. Earth Day was the brainchild of Senator Gaylord Nelson (D-Wisconsin) who wanted to raise awareness of the effects of pollution on the environment. At that time, protecting the planet and its resources was not part of the

the extraction of nymphaea Essay

6177 words - 25 pages study on the basis of the effect of textile wastewater on the anatomy of control and experimental plants.1. The significant reduction in cell sizes in various plant organs may be due to arrested growth under stressed conditions as textile wastewater contains heavy metals and other toxic materials.2. There are many raphide crystals in parenchyma cells of roots, petioles, rhizomes and leaves of treated plants.3. The chemical content of water in

Metals and Mining in India

1405 words - 6 pages continuous process which means iron can be made more efficiently. Disadvantages: - The use of carbon does mean carbon dioxide is released (it is a greenhouse gas) - Metals which are higher than carbon in the reactivity series (e.g. aluminum) and which react with carbon to form carbides (e.g. titanium and tungsten) cannot be extracted in this way. It is a specific method of extraction which is mainly for iron. - Metals that need to be very pure

The Use of Technology in Both the Training Methods and Training Environment of Elite Athletes in Global Sport

1110 words - 4 pages The Use of Technology in Both the Training Methods and Training Environment of Elite Athletes in Global Sport Technology is used to help advance elite athletes, by achieving the maximum for the individuals needs. Both with the training methods and environments technology is being used more and more, for example simulated competition environments. Although such technology is becoming increasingly popular with elite

Metals in the Bronze Age

2602 words - 10 pages It is commonly supposed that metals, and especially copper, were one of the most-traded goods in the Bronze Age period. This is largely attributable to the fact that some of the greatest metalworking centers, such as Mycenaean Greece, were not well provided with metal ores, and therefore had to import most of their metals. Some of the most important copper resources were Cyprus, Central Italy and Sardinia. Therefore, the distribution of metal

Banana Peel Lead Adsorption and the Removal of Heavy Metals

640 words - 3 pages seen that the high dosage of absorbent, it more good removal absorbent to the lead. The effect of dosage show that when higher amount of banana peel are used, percentage of removal(lead) will increase. But, the dosage of adsorbent on 0.8g and 2.8g, its have the negative on the conentration of lead. Its because the solution has contiminated. Besides that, the solution also was stirred maximully and not regularly. This results doesn’t counted in

The Properties of Tradition Metals

1124 words - 5 pages metals (commercially) and the rare and unimportant metals. They are ranged from very reactive to noble. The metals in this group all form a variety of different alloys. The f-type transition metals consists of lanthanides (rare earth metals) and actinides which is from thorium to lawrencium. These metals are very reactive. Only a few of these elements are common but several of the f-type elements are useful. For example, cerium and thorium, which

Extraction and clean-up of imazapyr and imazapic residues in selected fish species using solid phase extraction (SPE)

2145 words - 9 pages of River Chenab.” Science of the Total Environment 450-451: 83-91 Fuad, M. J., A. Junaidi, et al. (2012). “The Impact Of Pesticides On Paddy Farmers And Ecosystem.” Advances in Natural and Apllied Sciences 6(1): 65-70. Furlong, E.T., Burkhardt, M.R. et al (2000). “Routine determination of sulfonylurea, imidazolinone and sulphonamide herbicide at ng/l concentration by solid phase extraction and LC/MS”. Sc.Total Env. 248:135-146 Hess, F. G., and J

Dichlorodiphenyltrichloroethane and the Environment, The Global Impact

1055 words - 4 pages was stopped in the 1960s because it was harmful to the environment and wildlife. Today, the only legal use of DDT is for malaria control because of the over 300 million cases of malaria in one year which result in one million deaths. Currently, dichlorodiphenyltrichloroethane use is banned or restricted in more than 80 countries, and the United Nations Environmental Programme is starting negotiations for a global ban.There is a great deal of

Economic Policy and the Global Environment

1437 words - 6 pages Untitled Economic Policy and the Global Environment Pre-Course Assignment BCS12 Class A Student ID: 09139397 LUO SHENG Lecturer: Mr. Rodney Sim Question 1 "The price of gold has increased from less than US$700 per ounce in 2007 to more than US$1,000 per ounce in 2009." Discuss and explain with graphical illustrations, how the following events will lead to changes in the

The Global Business Environment

678 words - 3 pages The Global Business EnvironmentAbstractWhen a company decides to take their business abroad there are several things that must be considered. Social, cultural, economic, legal and political differences will have an effect on the success of an international business. This paper will provide examples of how these differences can affect international business and ways to deal with some of these differences.Cultural differences can play a major role

Similar Essays

Extraction And Recycling Of Metals Chemistry Notes

1012 words - 4 pages EXTRACTION AND RECYCLING OF METALS•Mineral: Naturally formed material with definite chemical and physical properties such as composition or colour. It is crystalline solid that occurs in the earth’s crust.•Ore: A rock with one or more mineral content that contains enough of it to be profitable to mine. An ore is also chosen to be mined because it might be economically cheaper to extract and recycle.•Factors that determine the

The Reactivity Of Metals And Their Discovery

1791 words - 7 pages will stay in the same shape, and ductile means that they can be formed and shaped into wires. Metals are solids (except for mercury and gallium), and they tend to be very strong and can hold big masses and weights.Now, in 1869,a man by the name of Mendeleev classified the metals and other elements into what is now known as the Periodic Table. He classified them into eight groups and a section called the Transition Metals. In Group I, these are the

Macro And Micro Environment Issues In The Fragrances Market

838 words - 3 pages The billion pound fragrances market in the United Kingdom is highly competitive and is always adapting to their environment. Despite the recession, the fragrances market have managed to boost their market value and thrive in the slowly recovering economy. To stay in business, it is imperative for marketing managers in fragrances to acknowledge issues in their macro and micro environments, such as the current economic state, the behaviour of

Environment And Ethical Issues In The Book By John Broome

2276 words - 10 pages The Book written by John Broome, Talks about how we as individuals should understand, the full effect we are having, on our environment and ethical issues brought on by our emissions of greenhouse gases. He goes into a lot of detail describing the moral injustice we have caused for the future generations, and many humans today. If we continue to destroy the earth by emitting CO2 in the air, global warming will continue to melt the polar ice caps