It8217s hard to imagine a world without copper We rely on copper for power lighting heating communications water supply and transport Copper makes our homes schools and businesses efficient comfortable and decorative and it lasts for many years
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In this esource we8217ll look at the ways of extracting copper from the ground
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Copper has a remarkable combination of properties it is a good electrical and thermal conductor it is ductile and it can prevent bacterial growth seecopper properties and applications
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As with all world resources the supply of copper from the ground is limited ever since copper was first mined it has been recycled today nearly one third of demand for copper is met through recycling helping to conserve the earth8217s resources
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All available copperbearing natural mineral aggregates are called copper mines the highgrade copper concentrate can be obtained by the coarse grinding roughing scavenging of copper ore then grinding and concentrating of coarse concentrate
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Due to the different types of ore the nature of the ore is also different so the beneficiation process needs to be customized the specific process for selecting copper ore depends mainly on the material composition structure and copper occurrence state of the original copper ore
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Generally speaking copper ore can be divided into three categories copper sulfide ore copper oxide ore and natural copper
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Before the beneficiation of copper ores crushing and grinding are required the bulk ores are crushed to about 12cm by a jaw crusher or a cone crusher then the crushed materials are sent to the grinding equipment and the final particle size of the copper ore is reduced to 01502mm
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Copper sulfide can be divided into single copper ore copper sulfur ore coppermolybdenum deposit copper nickel carrollite and so on basically only flotation can be considered in its separation
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Almost all copper sulphide ores contain ironbearing sulfides so in a sense the flotation of copper sulfide is essentially the separation of copper sulfide from iron sulfide the common iron sulfide minerals in copper ore are pyrite and pyrrhotite
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The main factors affecting the flotation of copperbearing pyrite are as follows
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1 disseminated grain size and symbiotic relationship of copper and iron sulfide generally pyrite has a coarse grain size while copper ore especially secondary copper sulfide is closely associated with pyrite only when the copper ore is finely ground can it be dissociated from pyrite this characteristic can be used to select coppersulphur mixed concentrates discard the tailings and then grind and separate the mixed concentrate
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2 the influence of secondary copper sulfide minerals when the secondary copper sulfide mineral content is high the copper ions in the slurry will increase which will activate the pyrite and increase the difficulty of cus separation
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3 the influence of pyrrhotite the high content of pyrrhotite will affect the flotation of copper sulfide pyrrhotite oxidation will consume the consumption of oxygen in the pulp in severe cases the copper minerals do not float at the beginning of flotation this can be improved by increasing inflation
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Using the fact that the iron is magnetic the magnet can be used to separate the iron fillings from the mixture by moving teh magnet around in the container keeping the magnet in a plastic bag makes it easy to separate the filings from the magnet when you pull it out
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Question 2 how will you separate a mixture containing sand and sugar
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Question 3 describe a method to separate a mixture of sand and salt
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Magnetic separation mining copper mooigezichtnl magnetic separation is a process in which magnetically this separation technique can be useful in mining iron as it is gold copper coal and inquiry the effect of
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Jul 19 2016 183 separation by magnet if a mixture contains iron as one of the constituentit can be separated by using magnet for example a mixture of iron filing and sulphur powder can be separated by using magnetthis is because iron filling are attracted by
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Question 6 how will you separate a mixture of sodium chloride and sand
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Copper ore an overview sciencedirect topics the common reagents for copper ore flotation are xanthates as collector pine oil as it is thickened in a raketype unit from a level of 30 solid content to 60 the separation of chalcopyrite and chalcocite from pyrite in cleaner flotation
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Question 8 describe a method to separate a mixture of camphor and sand
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About 200 years ago the uk was an important world source of copper and tin and there were mines in cornwall and devon these mines have now closed and today the biggest copper mines are in chile escondida mine and indonesia grasberg mine these produce many millions of tonnes of copper ore per year the main ores of copper are sulfides and
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Question 10 how do you separate a mixture of iron filling and powdered carbon
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In the extraction of iron from its ore the lighter slag is removed from the top by this method to leave the molten iron at the bottom in the furnace evaporate water from the copper sulphate solution so as to get a saturated solution with advancements in technology many more methods of separation techniques have been devised in
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Copper is very well suited to being recycled because it can be remelted endlessly with no loss of properties for example old copper plumbing pipes taps and car radiators are a major source of recycled copper they can all be melted down and made into new products even the few grams of copper in your mobile phone is worth recovering
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Copper is an unreactive metal it reacts only slowly with the atmosphere this means that huge lumps of copper metal are found buried in the ground as nuggets this is callednative copper the largest nugget of native copper ever found came from minnesota usa and weighed over 400 tonnes native copper isn8217t mined because there is so little of it therefore it is of little commercial importance
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Metals are often found as compounds in ores an ore is a rock or mineral that has enough metal in it to make it worth extracting
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Mining copperabout 200 years ago the uk was an important world source of copper and tin and there were mines in cornwall and devon these mines have now closed and today the biggest copper mines are in chile escondida mine and indonesia grasberg mine these produce many millions of tonnes of copper ore per year
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The main ores of copper are sulfides and oxides from their chemical formulas you can calculate the percentage of copper in each mineral however this is not the same as the percentage of copper in the ore as that also contains unwanted silicates and other minerals called gangue that will have to be separated
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Copper minerals and ore are found throughout the earth8217s crust they occur in both sedimentary and igneous rocks the outer 10 km of the crust contains 33 g of copper for every tonne of rock this is not enough to make it commercially viable to extract the rock
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