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针对难处理的鲕状高磷铁矿,提出了首先采用高气化性生物质木炭制备含碳球团,然后通过直接还原--高温熔分的方法,成功实现了该铁矿的除磷提铁.直接还原实验采用管式炉.考察了还原温度、生物质木炭加入比例(碳氧摩尔比)和气氛等条件对样品还原行为的影响,并确定了适宜的还原条件为温度1373K、配碳量0.9、时间15~25min以及气氛PCO2/PCO=1∶1.在此条件下,样品的金属化率和残碳质量分数分别在75%~80%和0.69%~0.11%的范围内.通过对该金属化球团的X射线衍射和扫描电镜--能谱分析发现:还原后样品中的主要物相为金属铁、磷灰石和硅酸三钙;磷没有被还原而仍以磷灰石的形式存在于脉石中.高温熔分实验采用Si--Mo棒高温箱式炉.实验结果得到磷质量分数为0.4%的铁样.在熔分体系中进一步添加相对质量为2%~4%的Na2CO3,可以得到磷质量分数在0.3%以下的铁样.基于以上分析,证明了采用生物质木炭用于高磷铁矿的除磷提铁是可行的.
For the refractory oolitic high-phosphate iron ore, the paper proposed a method of preparing carbon-containing pellets by using charcoal of high-charcoal biomass and then carrying out direct reduction-high-temperature melting to successfully remove phosphorus from the iron ore The direct reduction experiments were carried out in a tube furnace.The effect of reduction temperature, biomass charcoal addition ratio and atmosphere on the reduction behavior of the samples was investigated and the suitable reduction conditions were determined to be 1373 K with carbon Amount of 0.9, time of 15 ~ 25min and atmosphere PCO2 / PCO = 1: 1. Under these conditions, the metallization and residual carbon content of the sample ranged from 75% to 80% and from 0.69% to 0.11% X-ray diffraction and scanning electron microscopy-energy spectrum analysis of the metallized pellets showed that the main phases in the sample after reduction were metallic iron, apatite and tricalcium silicate. Phosphorus Stone in the form of gangue.High temperature melting experiment using Si - Mo rod high temperature box furnace experiment results obtained phosphorus content of 0.4% iron sample in the melting system to further add the relative mass of 2% 4% Na2CO3, you can get the phosphorus content below 0.3% iron sample based on the above analysis, card It is feasible to use the biomass charcoal for phosphorus removal from high-phosphorus iron ore.