隔膜電解法處理草漿黑液

摘要： 進(jìn)行了隔膜電解法處理草漿黑液的可行性實(shí)驗(yàn)研究．隔膜電解法實(shí)驗(yàn)采用鑄鐵作犧牲陽(yáng)極，石墨作陰極，多孔性的濾過(guò)式隔膜將陽(yáng)極區(qū)與陰極區(qū)分開(kāi)；陽(yáng)極及其附近有鐵的氧化與水解反應(yīng)，堿木素的取代反應(yīng)；陰極有析氫反應(yīng)；水分子和鈉離子在勢(shì)場(chǎng)力作用下透過(guò)隔膜從陽(yáng)極區(qū)進(jìn)入陰極區(qū)，堿木素分子被隔離在陽(yáng)極區(qū)；陽(yáng)極區(qū)不斷加入黑液，取走木素沉淀，陰極區(qū)不斷取走回收堿液，從而實(shí)現(xiàn)堿液與木素的分離．在電流為1 A、電壓為8 V及室溫條件下電解12 h，陽(yáng)極區(qū)黑液的色度、懸浮物及COD的去除率分別為66.4%，75.3%和94%，堿回收率達(dá)到94%以上．實(shí)驗(yàn)結(jié)果表明，作為一種處理黑液的堿回收技術(shù)，隔膜電解法處理草漿黑液比較容易直接嫁接到制漿工藝中，有可能成為解決草漿堿回收技術(shù)的新途徑． Abstract： Experimental study of feasibility on black liquor from straw pulp by electrolytic process has been carried out. The cast iron is used as anode and graphite electrode as cathode in the experiments. Electrolytic vessel is separated into both cells of anode and cathode with porous filtration membrane. There are reactions of oxidation and hydrolysis of Fe and substitution of alkaline lignin in the anode, and there is hydrogen evolution reaction on the cathode. H2O and Na+ move from the anode into the cathode through the membrane with the action of potential energy, and only lignin is left over in the anode. The process can make lignin separated from alkaline solution when black liquor is poured into the anode and alkaline solution is taken out from the cathode continually. The removal rate of colourity, SS and COD of black liquor can reach 66.4%, 75.3% and 94% respectively, and alkali recovery can be up to 94% at normal temperature and in treatment conditions (I=1 A, V=8 V, t=12 h). The experiments show that electrolytic process can be replanted onto pulping processes easily as a practical technique of alkali recovery and maybe is a new way of treating black liquor from straw pulp. 作 者： 盛利元    侯曼玲    許秀蘭    宋鴿    SHENG Li-yuan    HOU Man-ling    XU Xiu-lan    Song Ge   作者單位： 盛利元,SHENG Li-yuan(中南大學(xué)應(yīng)用物理與熱能工程系,)

侯曼玲,許秀蘭,宋鴿,HOU Man-ling,XU Xiu-lan,Song Ge(中南大學(xué)化學(xué)化工學(xué)院,) 

期 刊： 中南工業(yè)大學(xué)學(xué)報(bào)(自然科學(xué)版)  ISTICEIPKU   Journal： JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY（NATURAL SCIENCE）  年，卷(期)： 2001, 32(2)  分類號(hào)： X793  關(guān)鍵詞： 草漿黑液    電解法    堿回收   

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