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›› 2014, Vol. 14 ›› Issue (3): 369-376.

• 流动与传递 • 上一篇    下一篇

电石渣中高钙相的水力旋流法富集

杨航 曹建尉 王志 陈华辉 公旭中   

  1. 中国矿业大学(北京)材料科学与工程系 中国科学院过程工程研究所绿色过程与工程重点实验室，湿法冶金清洁生产技术国家工程实验室 中国科学院过程工程研究所 中国矿业大学(北京)材料科学与工程系 中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室
  • 收稿日期:2014-04-02 修回日期:2014-05-05 出版日期:2014-06-20 发布日期:2014-06-20
  • 通讯作者: 杨航

Enrichment of High Ca-containing Phases in Calcium Carbide Hydrolysis Slag with Hydro-cyclone Method

YANG Hang CAO Jian-wei WANG Zhi CHEN Hua-hui GONG Xu-zhong   

  1. Department of Materials Science and Engineering, China University of Mining and Technology (Beijing) National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences Institute of Process Engineering, Chinese Academy of Sciences Department of Materials Science and Engineering, China University of Mining and Technology (Beijing) National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, CAS
  • Received:2014-04-02 Revised:2014-05-05 Online:2014-06-20 Published:2014-06-20
  • Contact: YANG Hang

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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%(w)提高到61.78%(w)，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75 mm，含Si, Al, Fe和Mg物相颗粒平均粒径约为106~180 mm，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.

关键词: 电石渣, 水力旋流, 选择富集, 粒度, 解聚

Abstract: 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%(w) to 61.78%(w) 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 mm, and those of Si, Al, Fe and Mg-containing phases 106~180 mm. 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.

Key words: calcium carbide hydrolysis slag, hydro-cyclone, selective enrichment, particle size, deaggregation

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