1 (a) In this apparatus hydrochloric acid is decomposed by passing a direct electric current through it. Chlorine and hydrogen are formed. (i) Give the name of this process in which substances‚ such as hydrochloric acid‚ are decomposed by a direct electric current. (1) electrolysis (ii) Describe what happens when a burning splint is applied to a mixture of hydrogen and air in a test tube. (2) (b) (i) Complete the sentence by putting a cross ( ) in the box next to your answer. An acid
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Rod mills are very similar to ball mills‚ except they use long rods for grinding media. The rods grind the ore by tumbling within the the mill‚ similar to the grinding balls in a ball mill. To prevent the conditions leading to rod charge tangling‚ the length to diameter ratio is maintained at 1.4 to 1.6. Rod mills accept feed up to about 50 mm (2 in.) and produce a product in the size range of 3000 to 270 mm (–4 to –35 mesh). Grinding action is by line contact between the rods extending the length
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Centre Number For Examiner’s Use Candidate Number Surname Other Names Examiner’s Initials Candidate Signature Question General Certificate of Secondary Education Higher Tier June 2013 Science A CH1HP H Unit Chemistry C1 Chemistry Unit Chemistry C1 Monday 10 June 2013 1.30 pm to 2.30 pm Mark 1 2 3 4 5 6 7 TOTAL For this paper you must have: a ruler the Chemistry Data Sheet (enclosed). You may use a calculator. Time allowed 1 hour Instructions Use black ink or black ball-point
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Contact Persons Details: Name Designation Mobile No. Mobile No. P & T No. Fax No. e-mail address e-mail address SMS Alerts Interested in (Please tick): Ferrous / Non ferrous / Store/ Idle assets/ Chemicals/ Iron Ore Seller Y/ Material of interest N Bhilai Matl Y/N Matl Y/N Matl Plate Pooled Iron (CI) Ammonium
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in massive low grade ores and are found in intrusive porphyry formations‚ although many smaller sized but higher grade ores are located in non-porphyry areas. The nation has abundant domestic copper ore reserves but because of many detrimental economic factors much of the copper used by the U.S. industry is imported. Molybdenum ore is profuse and exports of it are high to fulfill the needs of foreign demand. Copper was first used by people around 4000 B.C.
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First pottery appears • 3rd millennium BC – Copper metallurgy is invented and copper is used for ornamentation • 2nd millennium BC – Bronze is used for weapons and armour • 16th century BC – The Hittites develop crude iron metallurgy • 13th century BC – Invention of steel when iron and charcoal are combined properly • 10th century BC – Glass production begins in ancient Near East • 1st millennium BC – Pewter beginning to be used in China and Egypt • 3rd century BC – Wootz steel‚ the first crucible
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material‚ mining‚ metallurgy and chemical industry. 2.The materials must be non-flammable and non-explosive materials such as limestone‚ calcite‚ barite‚ dolomite‚ potassium feldspar‚ marble‚ talcum‚ gypsum‚ medical stone‚ rock phosphate‚ manganese ore‚ iron ore‚ glass‚ ceramics‚ active carbon‚ fireproof materials‚ heat preservation materials‚ chemical materials and so on. 3.The material hardness should be below 9Moh and the moisture should be below 6%. The fineness of the finished products can be adjusted
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What do we know about the landscape and society of Iron Age Celtic Ireland c.500B.C to c.300AD? From about 300BC the roots of a Celtic Iron Age civilisation became established in Ireland.1 This period observed the emergence of kingdoms and the creation of Ireland’s finest archaeological landscape.2 We have evidence of a very highly organised society‚ of an Ireland that seemed to be flourishing. The first known reference to prehistoric Ireland is made; ‘The climate is unfavourable for the ripening
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The importance of mining is definitely significant to Canada. Mining‚ is an important industry‚ and Canadians are very advanced in their mining technology‚ but during the mining process‚ there is certain level of pollution produced. The Canadian government and the mining companies have very good plans and controls toward this problem‚ while ensuring the smooth running of the industries‚ and also helping to create strong economy and employment. The world of today could not exist without mineral products
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cement-manufacturing-process cement-1-manufacturing-process-l.jpg 鈥揷ement manufacturing process the... limestone mining and processing in kenya-minerals processing plant ... processing plant > iron ore beneficiation plant > silver ore processing plant > limestone processing plant > granite processing plant > copper 聽ore processing plant > gypsum processing plant > quartz processing plant home >> mineral beneficiation >> limestone mining and
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