复合脱硫剂中钙的物相分析

CHEMICAL PHASE ANALYSIS FOR CALCIUM COMPOUNDS IN COMBINED DESULPHURIZING AGENT

利用脱硫剂试样与水反应产生的乙炔通氧燃烧，生成的CO2用烧碱石棉吸收，重量法测定碳量，计算CaC2含量；用丙三醇-乙二醇-蔗糖-水混合浸取剂浸取游离CaO和CaC2，用EGTA在pH大于12时测定CaO和CaC2合量，将合量减去CaC2量计算游离CaO含量；浸取后残渣用乙酸浸取CaCO3,用EGTA络合滴定法测定钙量计算出CaCO3含量；最后的残渣用硫酸-盐酸-硼酸-水浸取分析CaF2。

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.