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yyrhyw木蟲 (正式寫手)
堅(jiān)持就是勝利!
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[求助]
這段英文麻煩翻譯下,謝謝
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4. Results and discussion 4.1. Thermodynamic equilibrium calculations Gibbs free energy calculations of the extraction reactions (Eqs. (4) and (6)) using HSC 5.1 showed that the extraction of Ca+2-ions from CaSiO3 is thermodynamically possible at temperatures lower than 156 1C, while the extraction of Mg+2-ions from MgSiO3 proceeds at temperatures lower than 123 1C (Fig. 3). Gibbs free energy calculations of the carbonation reactions (Eqs. (5) and (7)) showed that the carbonation of Ca+2-ions proceeds already at temperatures over 45 1C, while the carbonation of Mg+2-ions should only be possible at temperatures over 144 1C. The calculations also show that the extraction reactions are exothermic (DHo0), while the carbonation reactions are endothermic (DH40). The net reactions of calcium silicate carbonation (Eqs. (4) and (5)) and magnesium silicate carbonation (Eqs. (6) and (7)) are both exothermic. The dissolution of the various species of blast furnace slag in acetic acid was studied in more detail by calculating the chemical composition at thermodynamic equilibrium using HSC. The input parameters were set to simulate the extraction experiments carried out later on, using 4.2 g of blast furnace slag in a 250 ml aqueous solution of acetic acid (33.3 wt% CH3COOH, 66.7wt% H2O). Only the six largest species in blast furnace slag were used as input data,to simplify the results. All the compounds in the database of HSC 5.1 were used as potential products, except for C,CxHy, and all carbonates, which are unlikely products from the extraction process performed in absence of CO2. The results and input data are summarized in Table 1. The results show that all compounds (except for Ti) are expected to be dissolved in the solution. A large part of the metals dissolved are expected to form acetates, such as magnesium acetate, calcium acetate, and iron(II) acetate.Although Fe, S and Ti are in oxide states in slags, having the input of these in elemental form does not notably affect the outcome of the calculation, since HSC merely calculates the equilibrium composition. Although all compounds are not likely to be formed due to slow kinetics, the modeling results give a hint upon the feasibility of the extraction. |
木蟲 (正式寫手)
堅(jiān)持就是勝利!
至尊木蟲 (職業(yè)作家)
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使用HSC的5.1萃取反應(yīng)(式(4)和(6))的吉布斯自由能的計(jì)算表明,從CaSiO3提取的Ca2+是熱力學(xué)可能溫度低于1561℃,而從MgSiO3的提取Mg2+溫度低于1231℃(圖3)。碳化反應(yīng)(式(5)和(7))的吉布斯自由能計(jì)算表明,碳化Ca2+離子的過程在溫度超過451℃進(jìn)行,而碳化Mg2+應(yīng)該只可能在溫度超過1441℃。計(jì)算還表明,提取的反應(yīng)是放熱(DHo0),而碳化反應(yīng)是吸熱(DH40)。硅酸鈣碳化(Eqs.(4)和(5))和硅酸鎂碳化(式(6)(7))的凈反應(yīng)都是放熱反應(yīng)。 先給我20個(gè)再說吧 如果直接給我45個(gè) 我晚上再給你翻譯 |

至尊木蟲 (著名寫手)
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4.結(jié)果與討論 4.1 熱力學(xué)平衡計(jì)算 5.1中使用HSC的萃取反應(yīng)的吉布斯自由能計(jì)算(公式(4)和(6))表明:在低于1561C的條件下,從 CaSiO3中提取Ca2+在熱力學(xué)上是可行的,而從 MgSiO3中提取出Mg2+則需在低于1231C的條件下方可進(jìn)行(如圖3)。碳化反應(yīng)的吉布斯自由能的計(jì)算(公式(5)和公式(7))則說明當(dāng)溫度超過451C時(shí),Mg2+的碳化過程就已經(jīng)開始,而Mg2+的碳化過程只有在1441C以上時(shí)才可能發(fā)生。計(jì)算還表明該萃取反應(yīng)是放熱過程(DH40),而碳化反應(yīng)則是吸熱反應(yīng)(DH40)。同時(shí),硅酸鈣和硅酸鎂的碳化凈反應(yīng)(式(6)和(7))都是放熱反應(yīng)。 通過使用HSC,我們計(jì)算出了熱力學(xué)平衡中的化學(xué)組成,進(jìn)而詳細(xì)研究了溶解在醋酸中的各種高爐爐渣成分。隨后輸入?yún)?shù)來模擬接下來進(jìn)行的提取實(shí)驗(yàn),稱取4.2g高爐爐渣并將其倒入250ml醋酸中(質(zhì)量分?jǐn)?shù) CH3COOH 33.3%, H2O 66.7%)。為了簡化結(jié)果,我們只是將6種最大的爐渣作為輸入數(shù)據(jù)。由于在缺失CO2的條件下,C、CxHy和所有的碳酸鹽化合物不可能生成,因此除去以上化合物之外,HSC 5.1數(shù)據(jù)庫中的所有化合物都作為實(shí)驗(yàn)的潛在產(chǎn)物。實(shí)驗(yàn)結(jié)果和輸入數(shù)據(jù)匯總在表1中。結(jié)果證明所有化合物(除了Ti)都可能溶解于溶液中。其中大部分金屬是以醋酸鹽的形式溶解,如醋酸鎂、醋酸鈣和醋酸鐵(二價(jià))。雖然在爐渣中,F(xiàn)e、S和Ti是以氧化物的形式存在,但是在輸入時(shí)以金屬單質(zhì)的形式對計(jì)算結(jié)果并無顯著影響,這是由于HSC只是計(jì)算平衡組成。根據(jù)緩慢動(dòng)力學(xué),盡管并不是所有化合物都能形成,但是以上模型為我們檢驗(yàn)了提取過程的可行性。 樓主,單詞355個(gè),50單詞不少于20個(gè)金幣~您看著辦吧~~~ ![]() ![]() ![]() |

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