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The extraction step was studied in a batch reactor of stainless steel. The total volume of the reactor was 200 ml. The wollastonite rock sample was kindly supplied by Yoshioka Shoten, Ltd. The sample rock was pulverized and classified by metal meshes. Wollastonite particles (13.26g) were introduced to the reactor and mixed with the aqueous solution of acetic acid (acetic acid/water=13.72 g/50 g). The reaction temperature was 60¡ãC, and the reaction pressure was the atmospheric pressure. The reactant was stirred by a magnetic stirrer at 300 rpm. After a given reaction time, a part of the reactant was sampled and filtered. The Ca2+ concentration in the filtrate was measured using the ICP¨CAES technique (Hitachi P-4010). The calcium extraction ratio was calculated as the ratio of the Ca2+ concentration in the filtrate solution to the initial fraction of Ca in the feed. Note the initial fraction of Ca in the feed was so determined to obtain the saturated solution of calcium acetate when the extraction is 100% completed. |
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гæ (СÓÐÃûÆø)
- ·ÒëEPI: 11
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- É¢½ð: 5
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- Ìû×Ó: 89
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- ×¢²á: 2010-12-24
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