CHEMICAL PHASE ANALYSIS FOR CALCIUM COMPOUNDS IN COMBINED DESULPHURIZING AGENT

The acetylene produced in reaction of the sample of combined desulphurizing agent to water is burned in oxygen gas. The amount of CO₂ formed is determined in soda asbestos absorption gravimetric method so as to calculate CaC₂ content. The free CaO and CaC₂ in the sample are leached in glycerol-glycol-sucrose-water mixed leaching liquor. The total amount of Cao and CaC₂ is determined in EGTA complexometric titration at pH> 12. The amount of CaC₂ subtracted from the total amount of CaC₂ and CaO leaves the amount of free CaO. The CaCO₃ in residue after leaching is leached in acetic acid. The calcium acetate is determined in EGTA complexometric titration so as to calculate CaCO₃ content. The CaF₂ in the final residue leached in sulphuric acid chlorhydric acid-boracic acid-water is analyzed.