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factories for extracting silicon from sand

factories for extracting silicon from sand

Keep container dry. Magnesium Risk phrases: R11 15 Extremely flammable; Contact with water liberates highly flammable gases. Safety phrase: S7/8 43 Keep container tightly closed; Keep container dry. Hydrochloric Acid is a strong acid. Treat with the greatest respect. Risk phrases: R34 37 Causes severe burns; Irritating to eyes respiratory system. Safety phrase: S2 26 Keep out of reach of children; In case of contact with eyes, rinse immediately with plenty of water and seek medical advice; Wear suitable gloves and eye/face protection. Sodium hydroxide destroys clothes and causes injury to the skin. Treat with the greatest respect. Risk phrases: R35 Causes severe burns Safety phrase: S2/26/37/39 Keep out of reach of children; In case of contact with eyes, rinse immediately with plenty of water and seek...

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Chemicals Aluminum powder, 325 mesh or finer Powdered sulfur Dry white sand beach sand or washed white builders sand Hydrochloric acid, 4M Initiator chemicals: Fine magnesium powder magnesium ribbon or Potassium permanganate and glycerine Other Mortar pestle Small clay flower pot, 6.5 cm inside top diameter Small glass beaker plastic container Electronic balance, 100 g ± 0.1 g Heat resistant pad Transparent safety shield or fume cupboard Heat protective gloves eg. welding gloves Spatula metal tongs Fire lighter with long stem Heres How 1. Dry about 50 g of sand in an oven for 2 hours and then grind the sand to a powdered form in a mortar and pestle. 2. Weigh and mix the following to form a homogenous mix: 8 g of dry aluminum powder 10 g of powdered sulfur 7 g of dry powdered sand 3. The best mix is obtained by shaking the mixture for a minute in a sealed plastic container....

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Allow the solids and clay fragments to cool to room temperature. The clay flower pot invariably cracks and should not be re used. Dispose of all solids in the waste bin. The Chemistry There are basically three reactions here that produce a chain reaction effect. Magnesium burns in oxygen and produces the activation energy to get the sulfur and aluminum going. 2Mg + O2 2MgO + energy The aluminum and sulfur again, react in an exothermic reaction that is the source of activation energy for the silica and aluminum. 2Al + 3S Al2S3+ energy 3SiO2 + 4Al 2Al2O3+ 3Si + energy In the book Expose, Excite, Ignite! the author describes two simple tests that can be performed in the school lab to establish if the globules are indeed the semi conductor, silicon. You can purchase this book from Educational Innovations. This entry was posted on Wednesday, March 2nd, 2011 at 6:24 pm and is filed under Chemistry, College level, experiments, High School level. You can follow any responses to this...

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