Abstract None of the existing approaches to the extraction of metals from ore can completely explain the practical findings This suggests that reduction occurs by more than one pathway The solid phase reduction of metals by carbon in complex and lean iron ores from different sources and also in individual oxides of silicon chromium and aluminum is
Study with Quizlet and memorise flashcards containing terms like Where are metals found Most metals are found combined chemically with other elements often oxygen This means the metal must be what before it can be used In some places there is enough metal or metal compound in a rock to make it worth extracting the metal Then we call the rock a and others
a Write the steps involved in the extraction of pure metals in middle of the activity series from carbonate ores b How is copper extracted from its sulphide ore Explain the various steps supported by chemical equations Draw labelled diagram for electrolytic refining of copper
The correct answer is Minerals are naturally occurring chemical substances in the earth s crust obtained by mining But a mineral is called an ore only when the metal can be extracted from it conveniently and economically Thus all ores are minerals but all minerals are not ores
Following concentration the ores are subjected to smelting—an intense thermal process that converts metal ores into molten metal Smelting is followed by refining where impurities are removed to produce metals of the highest purity Lead Ores Lead is primarily extracted from the mineral galena which is lead sulfide PbS Galena is
Useful metals are often chemically combined with other substances forming ores A metal ore is a rock that contains enough of the metal to make it worthwhile extracting They have to be extracted from their ores through processes such as electrolysis using a blast furnace or by reacting with more reactive material
Useful metals are often chemically combined with other substances forming ores A metal ore is a rock that contains enough of the metal to make it worthwhile extracting They have to be extracted from their ores through processes such as electrolysis using a blast furnace or by reacting with more reactive material
The minerals from which metals can be recovered profitably are called ores It is possible to extract metals from minerals but all minerals are not good enough for the recovery of metals Concluding statement Ores are minerals from which metals can be extracted profitably
i The carbonate ores are changed into oxides by heating strongly in limited air This process is called calcination ZnCO 3 s heat ZnO s CO 2 g ii The metal oxides are then reduced to the corresponding metals by using suitable reagents such as carbon when zinc oxide is heated with carbon it is reduced to metallic zinc Z n O C → Z n CO iii The
Study with Quizlet and memorise flashcards containing terms like Where are metals found Most metals are found combined chemically with other elements often oxygen This means the metal must be what before it can be used In some places there is enough metal or metal compound in a rock to make it worth extracting the metal Then we call the rock a and others
In other words ores are elements occurring naturally in rocks or minerals from which metals can be profitably extracted Ores can therefore be termed naturally existing combinations of metals and many other elements This is where the process fulfills the demand for metals that are to be attained for most manufacturing industries such as
Most sulfides are electrically conducting generally semiconducting and this allows electrochemical reactions to occur at the solid/solution interface In fact electrochemical mechanisms play a key role in each of the processes that are involved in obtaining the component metals from their sulfide ores namely prospecting for ores weathering
Name the metal which is extracted from the ore called Rock salt b Name two ores of zinc Write the names of the chemical compounds present in them and give their chemical formulae c Explain how mercury is extracted from its sulphide ore cinnabar Give equation of the reactions involved d In the electrolytic refining of a metal M what would you tak eas anode cathode and
a naturally occurring solid material from which a metal or valuable mineral can be profitably extracted What is electrolysis the breakdown of a substance containing ions by electricity
Bioleaching = extracting metal with bacteria that feed on low grade metal ores = Bacteria lives off of provided energy by breaking weak copper sulphur bonds in ores replacing them with stronger bonds = releases copper that s extracted from leachate with scrap ion electrolysis
Study with Quizlet and memorise flashcards containing terms like What are ores how are metals below carbon in the reactivity series extracted how does using carbon extract metals from their ores and others
How is the metal extracted from the ores chemically by reduction or by electrolysis What may have to happen to some ores if it has to be extracted concentrated this just involves getting rid of unwanted rocky material What can electrolysis also be used to do
The metals at the top of the reactivity series can be extracted from their ores by an electrolytic process known as electrolytic reduction These metals such as sodium magnesium calcium and aluminum are very reactive and cannot be obtained from
Facts about Important Metals and Their Ores 1 The most common metal ores are oxides and sulphides 2 Sulphides are the oldest ores formed in the Earth s history when there was a lot of sulphur from volcanic activity 3 Oxides formed later when photosynthesis in plants released large amounts of oxygen into the atmosphere 4
