摘要
用水力旋流器分离和富集电石渣中含不同元素的物相,对富集效果进行分析.结果表明,富集后溢流主要为含Ca物相[Ca(OH)2和CaCO3],底流主要为含Si,Al,Fe和Mg物相(SiO2,Al2SiO5,Fe3O4和MgSiO3).溢流中Ca元素由41.73%(ω)提高到61.78%(ω),富集度在50%以上,底流产物中Si,Al,Fe和Mg比富集前分别提高了15.33%,6.89%,3.20%和1.13%.在入口水流速4000 cm/s的条件下,离心力和斯托克斯力共同提供的剪切力(66.2 kg/cm2)大于电石渣中含Ca物相和含Si,Al,Fe和Mg物相的相间粘附力(45.3 kg/cm2)是使电石渣团聚颗粒在旋流场内解聚的主要原因.含Ca物相颗粒平均粒径小于75μm,含Si,Al,Fe和Mg物相颗粒平均粒径约为106～180μm,含Ca物相颗粒的径向运动速度小于含Si,Al,Fe和Mg物相颗粒的运动速度是电石渣高钙相在水力旋流场中富集的原因.
Hydro-cyclone was used to achieve the deaggregation of agglomerated particles of calcium carbide hydrolysis slag and enrichment of high Ca-containing phases. The enrichment effect was evaluated. The results showed that the main phases in over flow were Ca-containing phases [Ca（OH）2 and CaCO3]. The main phases in bottom flow were Si, Al, Fe and Mg-containing phases（SiO2, Al2SiO5, Fe3O4 and MgSiO3）. Ca in over flow increased from 41.73%（ω） to 61.78%（ω） after enrichment, the enrichment rate was over 50%. Si, Al, Fe and Mg contents in bottom flow increased 15.33%, 6.89%, 3.20% and 1.13%, respectively compared with the slag before enrichment. When the inlet water velocity was 4000 cm/s through acting calculation of forces, the shear stress（66.2 kg/cm2） provided by the resultant action of centrifugal force and Stokes force was greater than the adhesive force（45.3 kg/cm2） between calcium- and Si, Al, Fe and Mg-containing phases, which led to the deaggregation of agglomerated particles in calcium carbide hydrolysis slag. The average particle sizes of Ca-containing phases were less than 75 μm, and those of Si, Al, Fe and Mg-containing phases 106～180 μm. The essence of enrichment of Ca-containing phases was that the radial sedimentation velocity of Ca-containing phase particles was less than that of Si, Al, Fe and Mg-containing ones was.
出处
《过程工程学报》
CAS
CSCD
北大核心
2014年第3期369-376,共8页
The Chinese Journal of Process Engineering
基金
国家高技术研究发展计划(863)基金资助项目(编号:2011AA06A107)
关键词
电石渣
水力旋流
选择富集
粒度
解聚
calcium carbide hydrolysis slag
hydro-cyclone
selective enrichment
particle size
deaggregation
