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内配碳球团性能(落下次数、抗压强度等),对于直接还原生产海绵铁时获得较高金属化率极为重要。首先初步确定每个因素的基准参数,通过改变其参数值进行一系列单因素试验,然后根据正交试验原理,设计了四因素三水平试验条件,采用769YP-60E型手动压片机对钒钛铁精矿内配碳球团压团工艺参数进行试验研究,最后运用极差分析法和方差分析法对试验数据进行处理,对影响球团性能的各因素进行显著性检验。结果表明:利用实验结果和极差分析综合比较确定了使生球落下次数较高的工艺条件分别为A2B2C3D2,即矿煤粒度比(200:60)、水分8%、粘结剂0.3%、压力为10MPa;方差分析将因素水平变化所引起的结果差异与误差波动带来的试验结果间的差异区分开来,得出影响落下次数的主次因素分别B2A2D2C3,即球团水分是影响球团性能或压团工艺参数的主要因素,矿煤粒度比对球团性能有较大影响,压团压力和粘结剂浓度对各项指标的影响最小;生球团要进行干燥处理,干燥温度为105℃,干燥时间控制在2h左右,所得球团的抗压强度为98N个/、高温爆裂性能小于20%,能满足转底炉直接还原工艺的要求。
With the performance of the carbon pellets (down the number of compressive strength, etc.), direct reduction for the production of sponge iron to obtain a high rate of metallization is extremely important. Firstly, the baseline parameters of each factor were initially determined. A series of single-factor experiments were carried out by changing the parameter values. Based on the orthogonal experimental principle, a four-factor and three-level experimental condition was designed. The 769YP- Iron ore concentrate with carbon pellet pressure process parameters of the experimental study, and finally the use of range analysis and analysis of variance test data to deal with the various factors that affect the performance of pellets significant test. The results showed that the process conditions of higher dropping times of green balls were A2B2C3D2, that is, the coal particle size ratio (200: 60), moisture 8%, binder 0.3%, pressure Is 10MPa; variance analysis will be caused by changes in the level of the difference between the results and error fluctuations caused by the difference between the test results, the number of primary and secondary factors that affect the number of fall were B2A2D2C3, the pellet moisture is the impact of the performance of the pellet Or pelletizing process parameters of the main factors, coal particle size ratio of coal pellets have a greater impact on performance, pressure and binder pressure on the concentration of the smallest of the indicators; raw pellets to be dried, the drying temperature of 105 ℃, drying time controlled at about 2h, the resulting pellet compressive strength of 98N /, high temperature burst performance of less than 20%, to meet the rotary hearth furnace direct reduction process requirements.