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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°C, 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–AES 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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愛(ài)與雨下(金幣+2): !~ 2011-09-22 16:27:54
yyrhyw(金幣+20, 翻譯EPI+1): 非常感謝 2011-09-22 16:50:24
愛(ài)與雨下(金幣+2): !~ 2011-09-22 16:27:54
yyrhyw(金幣+20, 翻譯EPI+1): 非常感謝 2011-09-22 16:50:24
| 在不銹鋼間歇反應(yīng)器研究了提取的步驟。反應(yīng)器總體積為200mL，硅灰石巖石樣品由Yoshioka Shoten公司友情提供。樣品粉碎后用金屬網(wǎng)進(jìn)行分級(jí)。取13.26g硅灰石顆粒置于反應(yīng)器中，加入乙酸水溶液（乙酸/水=13.72克/50克）混合均勻。反應(yīng)溫度為60℃，反應(yīng)壓力為大氣壓。反應(yīng)物用磁力攪拌器進(jìn)行攪拌，攪拌速度為300轉(zhuǎn)/分鐘。在給定的反應(yīng)時(shí)間過(guò)后，取出一部分反應(yīng)物，過(guò)濾，濾液中的鈣離子的濃度用原子發(fā)射光譜技術(shù)（儀器型號(hào)：Hitachi P-4010）進(jìn)行測(cè)定。鈣的提取率按照濾液中鈣離子的濃度與樣品中鈣的初始含量之比來(lái)計(jì)算。樣品中鈣的初始含量的測(cè)定是為了當(dāng)提取100%完成后獲得乙酸鈣飽和溶液。 |
2樓2011-09-22 15:36:24
3樓2011-09-22 15:38:36
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