本文選題：七鉬酸銨 + 四鉬酸銨　； 參考：《西北大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年06期

【摘要】：為了研究七鉬酸銨結(jié)晶過程的工藝條件和熱力學(xué)參數(shù),以四鉬酸銨為實(shí)驗(yàn)原料,采用氨溶冷卻結(jié)晶的方法生產(chǎn)七鉬酸銨,通過響應(yīng)面分析法優(yōu)化了各單因素條件對(duì)七鉬酸銨結(jié)晶收率的影響規(guī)律,最后求取了結(jié)晶過程的熱力學(xué)參數(shù)。結(jié)果表明:結(jié)晶的最佳工藝條件為料液比為0.25g/m L,攪拌速度158.33r/min,冷卻終溫7.90℃,考慮實(shí)際情況微調(diào)此條件進(jìn)行了3組重復(fù)性驗(yàn)證實(shí)驗(yàn),得到七鉬酸銨結(jié)晶收率為77%左右,質(zhì)量均達(dá)到化學(xué)純,滿足國(guó)標(biāo)要求,顆粒大小基本均勻。此外,熱力學(xué)參數(shù)ΔH,ΔG,ΔS三者均小于零,表明七鉬酸銨冷卻結(jié)晶是非自發(fā)溶液混亂度減小的放熱過程。
[Abstract]:In order to study the technological conditions and thermodynamic parameters of the crystallization process of ammonium sevomolybdate, ammonium tetramolybdate was used as the experimental material to produce ammonium heptamolybdate by the method of ammonia solution cooling crystallization. The effect of single factor conditions on the crystallization yield of ammonium heptamolybdate was optimized by response surface analysis. Finally, the thermodynamic parameters of the crystallization process were obtained. The results showed that the optimum conditions of crystallization were as follows: the ratio of solid to liquid was 0.25g/m L, the stirring rate was 158.33 r / min, the final cooling temperature was 7.90 鈩，

本文編號(hào)：2026808