摘要
为解决窑法磷酸工艺中回转窑结圈问题,提出一种球团高温固结工艺,考察了黏结剂种类、固结温度、固结时间对磷矿球团强度及其还原性的影响。结果表明,固结温度800℃以上,采用膨润土为黏结剂,球团抗压强度和落下强度明显高于腐殖酸钠为黏结剂的球团。在配碳量为理论用量的1.4倍、CaO与SiO_(2)物质的量比0.35、膨润土添加量为总物料量的1.5%、固结温度1000℃、固结时间30 min条件下,球团抗压强度和落下强度分别为345.36 N和33.50次。
In order to avoid formation of material ring in a rotary kiln caused by kiln phosphoric acid process,a technique of high⁃temperature consolidation of pellets was proposed,and the effects of types of binder,temperature and time of consolidation on the strength and reducibility of phosphate ore pellets were investigated.The results show that consolidation at a temperature over 800℃with bentonite as binder can lead to the pellets with compressive strength and drop numbers obviously higher than those with sodium humate as the binder.With an addition of carbon at 1.4 times of the theoretical amount,CaO and SiO_(2)at a molar ratio of 0.35,an addition of bentonite at an amount of 1.5%of the total material weight,consolidation at 1000℃for 30 min results in the produced pellets with compressive strength of 345.36 N and drop numbers of 33.50.
作者
魏世发
马彪
任国兴
WEI Shifa;MA Biao;REN Guoxing(Changsha Research Institute of Mining and Metallurgy Co Ltd,Changsha 410012,Hunan,China;Zhongyuan Critical Metals Laboratory,Zhengzhou University,Zhengzhou 450001,Henan,China)
出处
《矿冶工程》
CAS
北大核心
2024年第2期92-95,共4页
Mining and Metallurgical Engineering
基金
国家重点研发计划(2018YFC1900204)。
关键词
磷酸
配炭球团
高温固结
窑法磷酸
回转窑结圈
球团强度
黏结剂
膨润土
腐殖酸钠
phosphoric acid
carbon⁃bearing pellet
high⁃temperature consolidation
kiln phosphoric acid
material ring in a rotary kiln
pellet strength
binder
bentonite
sodium humate
