NaOH预处理稻草秸秆的软化效果研究

采用NaOH预处理稻草秸秆,设计正交试验研究了与稻草秸秆质量损失率有关的3个影响因子,并在此基础上通过组合试验进一步研究了稻草秸秆质量损失率与NaOH溶液质量分数、浸泡时间的关系.此外,首次引入成本评价指标(综合成本指数),选出最优试验组合.结果表明:各因子影响强弱顺序依次为浸泡时间、 NaOH溶液质量分数、处理温度,处理温度的影响很小,在常温下预处理比较经济;质量损失率跟浸泡时间的关系曲线变化明显,而跟NaOH溶液质量分数的关系曲线变化波动不大;最优试验组合是NaOH溶液质量分数为1%,稻草秸秆浸泡时间为6 h(常温),在此条件下,稻草秸秆的软化效果良好,有利于制砖粘结成型,且综合成本较低.

On Softening Effect of NaOH Pretreatment on Rice Straw

Rice straw has been pretreated with NaOH in this research. The orthogonal experiment has been designed to study three factors related to mass loss rate of rice straw. And on this basis, a further combining experiment has been designed to research the relationship between mass loss rate of rice straw and mass fraction of NaOH solution and soaking time. In addition, cost evaluation index (comprehensive cost index) has been introduced for the first time to select the best test combination. The results show that the order of influence is that "soaking time > mass fraction of NaOH solution > the processing temperature", and the processing temperature has little effect. Pretreatment is economical at room temperature. The relation curve between mass loss rate and soaking time changes significantly, while the relation curve between mass loss rate and mass fraction of NaOH solution doesn''t fluctuate significantly. The best test combination is that "mass fraction of NaOH solution is 1%, and the soaking time of rice straw is 6h (room temperature)". Under these conditions, rice straw softens well, which is advantageous to bond brick forming and the comprehensive cost is low.