肥料成粒相关影响因素的研究

发布时间：2018-05-29 14:37

本文选题：固体粘结剂 + 休止角　；参考：《山西师范大学》2015年硕士论文

【摘要】：本论文从固体粘结剂（如轻钙、凹凸棒土和黄色脱硫石膏）的类型和造粒工艺参数两方面出发，探讨各相关影响因素对肥料造粒的影响。通过肥料与固体粘结剂的休止角变化趋势，探究固体粘结剂成粒机理，，构建休止角与肥料成粒的关联。在28-6-6试验中，通过改变固体粘结剂混合方式和使用微波加热方法，探究其对肥料成粒的作用，为产品产业化提供了理论依据。首先，比较不同固体粘结剂（轻钙、凹凸棒土和黄色脱硫石膏）分别与单一肥钾肥、氮肥和复合肥25-0-5系列混合后休止角的变化趋势。结果表明，添加固体粘结剂的物料与未添加固体粘结剂相比，休止角明显增加4~7.5°。这主要是由固体粘结剂轻钙、凹凸棒土和黄色脱硫石膏内部结构决定的。且在一定配比范围对应的成粒效果最好。以此建立了休止角-固体粘结剂结构-化肥成粒机理模型，为将固体粘结剂应用于肥料生产提供理论基础。其次，研究了28-6-6复合肥在小试、中试和大试的成粒情况。通过试验验证预混合方式对于成粒效果的影响。从肥料体系中物料之间相互作用（物理、化学方面），探究固体粘结剂在28-6-6系列造粒过程中的关键作用，探究制备工艺对于肥料成粒的影响。结果表明，在28-6-6配方中，当熟石膏和轻钙预混合，且混合时间为2h时，使用水为液体粘结剂时，成粒效果最佳。最后，通过比较28-6-6在使用不同固体粘结剂时的造粒试验和电镜图分析，得到当固体粘结剂为熟石膏时明显比使用二水脱硫石膏（即生石膏）时的成粒效果好。并研究了固体粘结剂生石膏在微波加热条件下的形态转化。通过试验探究功率，物料量等因素对于生石膏形态转化的影响。从小试试验和微观角度阐述了制备工艺微波加热在肥料成粒中的应用。总之，本文从肥料与不同固体粘结剂的休止角变化情况入手，探究固体粘结剂内部结构与肥料成粒之间的内在关联，并从制备工艺角度出发，研究了物料预混合和微波加热方式对成粒的影响，从而为肥料造粒提供试验依据。
[Abstract]:Based on the types of solid binder ( such as light calcium , attapulgite and yellow desulfurization gypsum ) and the parameters of granulation process , this paper discusses the influence of various influencing factors on the granulation of fertilizer . In the experiment of 28 - 6 - 6 , by changing the mixing mode of solid binder and using microwave heating method , this paper studies its effect on fertilizer granulation and provides theoretical basis for the industrialization of the product .

First , the change tendency of repose angle was compared with the mixture of single fertilizer , potash fertilizer , nitrogen fertilizer and compound fertilizer 25 - 0 - 5 . The results showed that the angle of repose increased by 4 - 7.5 掳 compared with that of non - added solid binder . The mechanism model of repose angle - solid binder structure - fertilizer granulation mechanism was established to provide theoretical basis for applying solid binder to fertilizer production .

The effect of pre - mixing method on granulation was studied by means of experiment . The key role of solid binder in 28 - 6 - 6 series granulation process was investigated . The results showed that when plaster and light calcium were pre - mixed in 28 - 6 - 6 formulation , and the mixing time was 2h , the granulation effect was the best when water was used as liquid binder .

Finally , by comparing the granulation test and the electron microscope chart of 28 - 6 - 6 when using different solid binder , it was found that when the solid binder was plaster , the granulation effect was better than that when using dihydrate desulfurized gypsum ( i.e . , gypsum ) . The influence of the factors such as power and material quantity on the morphology transformation of gypsum was studied .

In conclusion , the internal relationship between the internal structure of solid binder and the granulation of fertilizer was investigated from the change of the angle of repose of fertilizer and different solid binder , and the effect of pre - mixing and microwave heating on granulation was studied from the viewpoint of preparation process , thus providing experimental basis for fertilizer granulation .
【学位授予单位】：山西师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ440.1

【参考文献】