World production of lime in 2O08 was 296 Mt. The term ‘lime’ may refer to CaO (quicklime) and/or slaked lime (Ca(OH)2), but is also used to encompass CaO, Ca(OH)2, CaOMgO, Ca(OH)2 MgO and Ca(OH)2 Mg(OIl)2.
(a) How are CaO and CaOMgO manufactured?
(b) Describe the role of CaO in the building industry,
(c) How is CaO converted to calcium carbide. Comment on recent trends in the industrial importance of this reaction,
(d) In the paper industry, wood chips are converted to pulp by treatment with aqueous NaOH and Na2S. Heating the spent liquor gives Na2CO3. Explain how treating this residue with Ca(OH)2 followed by appropriate steps allows both NaOH and Ca(OH)2 to be recovered.
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