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以新制铁和陈化铁模拟纸浆漂白过程流中的非过程铁元素,研究了非过程铁元素存在颗粒的粒径大小和分布、表面形态和物象组成.研究发现,新制铁胶体颗粒以纳米级存在(210~250 nm),并随体系pH值增加而增加,其密度和体积分布呈双峰分布.70℃水浴加热1 h后,新制铁胶体颗粒粒径明显增加,pH13时达到1 620 nm.陈化铁颗粒粒径较大,高达10μm。IR、XRD、SEM-EDS分析表明,以新制铁形式的非过程铁胶体颗粒没有结晶成分存在,其宏观分子式为Fe29.1O17.2(OH)52.9;以陈化铁形式存在的非过程铁胶体颗粒主要以Fe2O3晶体存在,其宏观分子式为Fe34.7O38.8(OH)26.5.
New iron and aged iron were used to simulate the non-process iron elements in pulp bleaching process, and the particle size, distribution, surface morphology and object composition of non-process iron elements were studied.The results show that the new iron colloid particles are nano- (210-250 nm), and the density and volume distribution increased with the increase of pH value of the system.The particle size of the new colloidal iron colloid particles increased obviously after heating at 70 ℃ for 1 h, reaching a value of 1 620 nm The aged iron particles have a large particle size up to 10μm. IR, XRD and SEM-EDS analysis showed that the non-process iron colloidal particles in the form of new iron do not contain any crystalline components and the macromolecular formula is Fe29.1O17.2 (OH) 52.9. The non-process iron colloids The particles mainly exist as Fe2O3 crystals, and their macroscopic molecular formula is Fe34.7O38.8 (OH) 26.5.