提钒尾渣煤基回转窑法钙化还原脱钠研究
Study on calcification reduction sodium removal of vanadium extraction tailings by coal-based rotary kiln method
王兆才 1郑富强 1刘臣 1胡兵 1师本敬1
作者信息
- 1. 中冶长天国际工程有限责任公司,湖南长沙 410007;国家烧结球团装备系统工程技术研究中心,湖南长沙 410205
- 折叠
摘要
针对提钒尾渣中钠含量高,导致难以返回烧结-高炉流程进行回收利用的问题,提出基于煤基回转窑还原的提钒尾渣钙化还原脱钠技术路线,并在Ø1 m×10m回转窑中试线进行半工业试验,主要研究了高温段还原温度、白灰配比、入窑吨球焦粉配比、高温还原时间对提钒尾渣脱钠的影响规律,同时对脱钠后球团性能和回转窑结窑情况进行分析.结果表明,在高温段温度为1 100～1 160℃,高温段时间为1.8～2 h,入窑吨球焦粉配比为800～1 000 kg,白灰配比为32.5％～41％的条件下,提钒尾渣脱钠率可达到80％以上,吨球焦粉实际消耗量为359 kg.窑内结块物主要由提钒尾渣球团粉末和焦粉灰分粉末组成,结块物呈疏松多孔状,由细颗粒相互粘结构成,窑转动过程会自动掉落,无明显结窑现象.
Abstract
In view of the high sodium content in vanadium extraction tailings,which leads to the diffi-culty of returning to the sintering-blast furnace process for recycling,herein we proposed a calcification reduction sodium removal technology route for vanadium extraction tailings based on coal-based rotary kiln reduction,and conducted a semi-industrial test on a Ø1 m×10 m rotary kiln pilot line.The influ-ence of reduction time in the high temperature section,white ash ratio,into the kiln ton-ball coke ratio and high temperature reduction time on vanadium extraction tailings sodium removal was mainly stud-ied.At the same time,the performance of pellets after desalination and the situation of kiln formation in the rotary kiln were analyzed.Under the conditions of high temperature section temperature of 1 100～1 160 ℃,high temperature section time of 1.8～2 h,into the kiln ton-ball coke ratio of 800～1 000 kg,white ash ratio of 32.5％～41％,the sodium removal rate of vanadium extraction tailings can reach more than 80％,and the coke consumption is 359 kg.The agglomeration in the kiln is mainly composed of vanadium extraction tailings pellet powder and coke ash powder.The agglomeration is loose and por-ous,consisting of fine particles which are sticky to each other.The agglomeration will fall off automat-ically during the kiln rotation process,without obvious kiln formation phenomenon.
关键词
提钒尾渣/钙化还原/脱钠/回转窑还原Key words
vanadium extraction tailing/calcification reduction/sodium removal/rotary kiln reduction引用本文复制引用
基金项目
湖南省重点研发计划(2023SK2079)
出版年
2024
国家科技期刊平台
NSTL
万方数据