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·The grades of some nonmetallic ores such as smelting quartz piezoelectric quartz and gemstones depend on the physical and chemical properties of the minerals themselves and their industrial purposes Precious metal ores grades are expressed in g/t Primary diamond ores grades are expressed in ca/t or mg/t 1 carat = g
Iron processing Ores Smelting Refining Iron ores occur in igneous metamorphic transformed or sedimentary rocks in a variety of geologic environments Most are sedimentary but many have been changed by weathering and so their precise origin is difficult to determine The most widely distributed iron bearing minerals are oxides and iron ores consist mainly of
·Redox reactions are involved in the extraction of metals from their ores eg extracting iron by reduction within the blast furnace Transition metals have high melting points and densities form
·Notes 2 CHEMISTRY MODULE 6 Occurrence and Extraction of Metals Chemistry of Elements z list and explain various methods for concentration of ores gravity separation magnetic separation froth floatation and chemical method ; z explain different metallurgical operations roasting calcination and smelting with suitable examples; z choose
Important metals and their ores METAL ORES CHEMICAL FORMULA Sodium Chile Saltpeter NaNO 3 Calcium Dolomite CaCO 3 Aluminum Bauxite Al 2 O 3 Potassium Nitre KNO 3 Magnesium Magnesite MgCO 3 Minerals are inorganic solids with a crystalline structure and a defined chemical formula range that occur naturally Mineral
·• A metal can either be reduced or oxidised in a reaction • Reduction occurs when a metal in a compound loses oxygen to form the elemental metal • Oxidation occurs when a metal or carbon gains oxygen to form an oxide compound Ideas for the classroom Many metals can be reduced and extracted in a school laboratory
Steps in the extraction of metals from their ores Concentration of Ores The very first step which is the concentration of ore involves the removal of gangue particles that can be achieved using gravity separation froth floatation magnetic separation and leaching The gravity separation method is used when gangue particles are lighter than the ore
Example 1; Example 2; References; Perhaps the most useful feature of thermochemical equations is that they can be combined to determine ΔH m values for other chemical reactions For example iron forms several oxides including iron II oxide or wüstite FeO iron III oxide or hematite Fe 2 O 3 and finally iron II III oxide or magnetite FeO·Fe 2 O 3 or Fe 3 O 4
·Importance of aluminum as a metal Aluminum is an important metal due to its unique combination of properties making it a valuable material in various industries and applications Some of the key reasons for the importance of aluminum as a metal are Lightweight Aluminum is a lightweight metal about one third the weight of steel which makes
As stated above just to recap when sulphide is treated with a standard acid it is converted into hydrogen sulphide H 2 S along with the salt of a metal Sulphur or sulphate is formed once sulphide is oxidised Sulphur metals or salts of metals are formed once non metals like bromine iodine and chlorine react with metal sulphides viz
The alkaline earth metals are somewhat easier to isolate from their ores as compared to the alkali metals because their carbonate and some sulfate and hydroxide salts are insoluble A crystal of strontianite Both strontianite one of the most important strontium ores and strontium are named after the town of Strontian Scotland the
The other alkali metals and the alkaline earth metals are recovered from their ores by similar processes General Properties of the Alkali Metals Various properties of the group 1 elements are summarized in Table PageIndex{1} In keeping with overall periodic trends the atomic and ionic radii increase smoothly from Li to Cs and the
i Name a metal which is found abundantly in the earth s crust ii What is the difference between calcination and roasting iii Name the process used for the enrichment of sulphide ore iv Write the chemical formulae of one main ore of iron and aluminium v Write the constituents of electrolyte for the extraction of aluminium
·low grade ores contain a small percentage of the metal or its compound high grade ores contain a larger percentage Most metals are extracted from ores found in the Earth s crust It is more
Metal Hydrides are formed when Metals reacts with dihydrogen For Alkali metals react in following way 2M H 2 → 2M H Reaction of metals with Halogens Metals react with halogens to form halides which are ionic compounds For Sodium reacts with Chlorine to form Sodium Chloride 2Na Cl 2 → 2NaCl Reaction of metals with acids
Trick Know the chemical formulas of ores containing respective metals Question 2 In the leaching of alumina from bauxite the ore expected to leach out in the process by reacting with NaOH is A variety of concepts are involved to carry out the extraction of various metals from their respective ores and further help in understanding a
The chemical symbol of this metal is Al In the boron group with symbol Al aluminium is a chemical element and is the most commonly used non ferrous metal Table of Contents Ores of Aluminium; Metallurgy of Aluminium; Dressing of ore; Concentration of ore; Bayer s Process; Hall Heroult Process; Aluminium Uses; Recommended Videos
·It will help in your various exam preparations through which you will be able to learn the formulas of elements A list of important metals with ores is given in this article which will give an
The conversion of metals from their ores to more useful forms is called metallurgy which consists of three general steps mining separation and concentration and reduction Write a balanced chemical equation to show how you would produce this compound from; chromium metal ammonium dichromate CrCl 3 in a basic solution Answer begin
·Fine iron ores and concentrate products have characteristic particle size distributions which like their chemical analyses inevitably change with time Figure The majority of fine iron ores have P 100 of 12 mm with P 50 of mm of average coarseness P 50 > mm signifying a coarse ore and P 50 < mm a finer than average fine ore
Rules for Assigning Oxidation States The oxidation state of an atom in any pure element whether monatomic diatomic or polyatomic is zero The oxidation state of a monatomic ion is the same as its charge—for example Na = 1 Cl − = −1 ; The oxidation state of fluorine in chemical compounds is always −1
The metal reactivity series is a list of metals arranged in the order of their decreasing activities The metals at the top of the series K Na Ca Mg and Al are so reactive that they are never found in nature as free elements It is difficult to separate them from their compounds and extract The metals at the bottom of the activity series
·Industrial Minerals Ores and Gems There are over 4700 known minerals We obtain most of the materials used in everyday life from minerals including metals chemicals used in manufacturing food additives etc Ores Part A The table lists several ores of metals and their chemical formulas Identify the metal that each mineral ore is a
