| 摘要 |
PROBLEM TO BE SOLVED: To establish a method for analyzing a cause of operational abnormalities in an caustification process, resulting from foreign materials dissolved in green liquor by performing the adjustment of pH and analyzing the impurities precipitated at a prescribed pH value. SOLUTION: This method of analysis is provided by performing the adjustment of pH by adding an acid to the green liquid obtained by dissolving smelt from a recovering boiler with weak liquid, precipitating the impurities in the green liquor at the prescribed pH value, performing the qualitative/quantitative analysis of dissolvable impurities selected among the dissolved impurities in the green and precipitated at the prescribed pH value so as to be able to analyze the concentration of dissolvable impurities in the clear liquor of the green liquor, and also thereby, solving problems quickly by elucidating the position of admixing the impurities regarding to the operational abnormalities such as the reduction of calcined lime purity, the clogging, etc., of a white liquor-filtering device and lime sludge-dehydrating device caused by the foreign materials dissolved in the green liquor, so as to contribute for performing a stable operation. COPYRIGHT: (C)2006,JPO&NCIPI
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