摘要
为了解炼钢除尘灰中碳类物质对铁水脱磷的影响,基于FeO-CaO-SiO-CaCl系炉渣在1 400℃对高磷铁水的脱磷效果,分别将不同量的煤粉、焦粉和石墨粉加入脱磷剂,进行了含碳脱磷剂的铁水脱磷试验。同时,为实现除尘灰的高效脱碳,采用氧化焙烧工艺对除尘灰脱碳,并在此基础上通过研究温度、时间与除尘灰含碳量的关系确定了最佳脱碳参数。结果表明:在n(FeO)/{1.5n[Si]+1.2n[P]}=1且n(CaO)/{n([Si]+n[P]}=2.84的条件下,脱磷剂中碳的质量分数低于2%即可实现高效脱磷。在除尘灰脱碳试验中,当焙烧温度在800~1 000℃时,达到最低碳含量所需的焙烧时间为110~180 min。但考虑到脱碳效率和需求,采用1 000℃焙烧温度和100 min焙烧时间更合适。
In order to understand the effect of carbon substances in dedusting ash of steelmaking on hot-metal dephosphorization, based on the dephosphorization effect of FeO-CaO-SiO-CaClslags on high-phosphorus hot metal at 1 400 ℃, the dephosphorization experiments of the carbon-containing dephosphorizing agent were carried out by adding different qualities of coal powder, coke powder, and graphite powder into dephosphorizing agent. Meanwhile, in order to achieve high-efficiency decarburization of dedusting ash, the decarburization experiments of dedusting ash were carried out by an oxidation roasting process, and on this basis, the best decarburization parameters were determined by investigating the relationship between temperature, time and carbon content of dedusting ash. The results showed that under the conditions that both n(FeO)/{1.5n[Si]+1.2n[P]}=1 and n(CaO)/{n([Si]+n[P]}=2.84, the high-efficiency dephosphorization could be achieved when the mass fraction of carbon in dephosphorizing agent was less than 2%. In the decarburization experiments of dedusting-ash, when the roasting temperature was 800 to 1 000 ℃, the roasting times required to reach the minimum carbon content were 110 to 180 min. However, considering the decarburization efficiency and demand, it is more appropriate to adopt roasting temperature of 1 000 ℃ and roasting time of 100 min.
作者
孙国斌
向晓东
SUN Guobin;XIANG Xiaodong(School of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan Hubei 430081,China;State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control,Wuhan Hubei 430081,China)
出处
《上海金属》
CAS
2022年第5期82-86,共5页
Shanghai Metals
基金
武汉市应用基础研究计划项目(2016060101010071)。
关键词
脱磷
煤粉
焦粉
石墨粉
脱碳
时间
温度
dephosphorization
coal powder
coke powder
graphite powder
decarbonization
time
temperature
