【摘要】：考察了顆粒粒徑、鹽酸濃度和浸取溫度3個條件對活化煤氣化粗渣(簡稱活化渣)中鋁、鐵、鈣離子浸取率的影響,并對浸取機(jī)理進(jìn)行了研究。實(shí)驗(yàn)結(jié)果表明,活化渣為鈣鋁黃長石(2CaO·Al_2O_3·SiO_2)與三氧化二鐵(Fe_2O_3)的固溶體,與鹽酸反應(yīng)后顆粒粒徑不斷減小,鈣離子較鋁、鐵離子優(yōu)先浸出,其浸取過程符合化學(xué)反應(yīng)控制的縮芯模型,相應(yīng)的表觀活化能為71.3 k J/mol;鈣離子浸出后活化渣顆粒成為疏松多孔材料,鋁、鐵離子的浸取過程則符合Avrami模型,二者的浸取反應(yīng)均受內(nèi)擴(kuò)散控制,表觀活化能分別為24.7 k J/mol和22.5 k J/mol。
[Abstract]:The effects of particle size, concentration of hydrochloric acid and leaching temperature on the leaching rate of aluminum, iron and calcium ions in activated coal gasification coarse slag (activated slag) were investigated, and the leaching mechanism was studied. The experimental results show that the activated slag is a solid solution of 2CaO Al_2O_3 SiO_2 and Fe_2O_3. The particle size decreases continuously after reaction with hydrochloric acid, the calcium ion is preferentially leached over aluminum, and the leaching process accords with the model of shrinking core controlled by chemical reaction. The corresponding apparent activation energy is 71.3 k / mol. The activated slag particles become porous materials after calcium ion leaching. The leaching process of aluminum and iron ions conforms to the Avrami model, and the leaching reaction of both is controlled by internal diffusion. The apparent activation energy is 24.7k J/mol and 22.5kJ / mol, respectively.
【作者單位】： 華東理工大學(xué)資源與環(huán)境工程學(xué)院;
【基金】：國家“863”計(jì)劃項(xiàng)目(2011AA06A102) 博士點(diǎn)基金項(xiàng)目(20110074110002)
【分類號】：X784
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本文編號：2144742