黄腐酸从风化煤中溶出时的吸附平衡及溶解性研究
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摘要
近年黄腐酸在工农渔医牧各业应用广泛,但是在制备黄腐酸时还存在黄腐酸溶出少、溶液浓度低等问题,造成了原料的浪费和废渣排放量的增大。而提高溶出率可从黄腐酸的溶解性和吸附平衡(废渣对已溶黄腐酸的吸附)两方面入手研究来达到。为此本论文进行了黄腐酸从风化煤中溶出时的吸附平衡及溶解性的研究。
     本文采用分光光度分析法、红外光谱分析法等现代测试手段,定量研究和定性分析相结合的研究方法首次测定和分析了黄腐酸在风化煤渣上的吸附;综合运用胶体化学、物理化学、表面化学等学科的理论和知识,分析了黄腐酸的溶解机理;并探讨了温度、介质、溶液的pH值对黄腐酸在风化煤渣上的平衡吸附量和溶解性的影响。
     研究结果表明:(1)温度升高,黄腐酸在煤渣上的平衡吸附量减少;(2)加入硫酸盐介质,黄腐酸在煤渣上的平衡吸附量减少,但幅度变化不大;(3)溶液pH值减小,黄腐酸在煤渣上的平衡吸附量增加,pH值增大,平衡吸附量减少;(4)对比煤渣在不同条件下吸附黄腐酸后的红外谱图,发现吸收峰有明显的差异;(5)黄腐酸在溶解过程中会出现胶凝现象。
Fulvic acid was applied extensively in industry, agriculture, fishing, medicine, graziery in recent years, but there were some problem such as dissolution of fulvic acid is little and solution concentration is low in the process of preparation of fulvic acid, which result in waste of raw material and increase of coal residual discharge capacity. Rising of abstract rate can reach by the study of dissolvability and adsorption equilibrium (coal residual adsorbs fulvic acid) of fulvic acid. Wherefore, adsorption equilibrium and dissolvability of fulvic acid in the process of abstract from weathered coal were studied in this paper.
    In this paper, the adsorption of fulvic acid on the weathered coal residual was firstly measured and analyzed by modern technique such as Spectrophotometry, IR, and study means of quantitative research and qualitative analysis; the principles of the Colloid Chemistry, the Physical Chemistry, the Surface Chemistry, the dissolution mechanism of fulvic acid was analyzed; and the
    
    
    temperature, the medium, the pH value of the solution that affect the equilibrium adsorptive capacity of fulvic acid on the coal residual and dissolvability of fulvic acid were also studied.
    The research shows that:(l) The equilibrium adsorptive capacity of fulvic acid on the coal residual decreases with the rise of temperature;(2) The equilibrium adsorptive capacity of fulvic acid on the coal residual decreases with the join of media in the solution, but the decrease amplitude is little; (3) Diminishing of the pH value of solution, the equilibrium adsorptive capacity of fulvic acid on the coal residual increases; rising of the pH value, the equilibrium adsorptive capacity decreases;(4) Compared FTIR coal residual in different condition show that the absorptive crests have obvious difference;(5) Fulvic acid occurs gelatinization in the process of dissolution.
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