Effect of MgO/Al2O3 Mass Ratio on Mineralization Behavior of Limonitic Laterite Ore During Sintering
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摘要:
为了提高红土镍矿烧结矿的产质量指标，基于热力学分析，查明了MgO/Al2O3质量比对高温烧结过程液相量及其黏度的影响；再通过微型烧结试验探讨了镁/铝质量比对烧结矿的物相组成、黏结相强度的影响，阐明其对褐铁矿型红土镍矿烧结成矿行为的影响；最后通过烧结杯烧结扩大试验进行了有效性验证。微型烧结试验结果表明，在烧结温度为1 300 ℃、烧结气氛为5% CO+95% N2、二元碱度m(CaO)/m(SiO2)=1.3的条件下，m(MgO)/m(Al2O3)=0.5~0.8范围内，黏结相主要由钙镁黄长石和钙镁橄榄石构成，强度超过4 000N/个。烧结杯验证试验表明，镁/铝质量比由0.5提高至0.7时，烧结矿的成品率无明显变化保持在70%左右，但是其转鼓强度由49.73%提高至56.67%，烧结矿的转鼓强度得到有效改善，适宜的镁/铝质量比为0.6～0.7。
Abstract:To improve the production and quality indices of laterite ore sinter, the effect of MgO/Al2O3 mass ratio on the liquid volume and viscosity during high-temperature sintering was investigated, based on thermodynamic analysis. The influence of MgO/Al2O3 ratio on the phase composition and bonding phase strength of sinter was discussed through micro-sintering test, and the impact of MgO/Al2O3 mass ratio on sintering mineralization behavior of limonitic laterite ore was clarified. Finally, the validity of our findings was confirmed through sinter-pot large-scale sintering test. The results of micro-sintering test showed that the bond phase was mainly composed of calc-magnesia melilite and olivine and their compressive strength exceeded 4 000 N/P, under the condition of m(MgO)/m(Al2O3)=0.5~0.8, sintering temperature of 1 300 ℃, sintering atmosphere of 5%CO+95%N2, binary basicity of m(CaO)/m(SiO2)=1.3. The sinter-pot verification test revealed that increasing the MgO/Al2O3 mass ratio from 0.5 to 0.7, the yield of sinter did not change significantly and remained at approximately 70%, but its tumbling strength of sinter increased from 49.73% to 56.67%, and the optimal MgO/Al2O3 mass ratio was in the range of 0.6-0.7.
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Key words:
- limonite laterite ore /
- sintering mineralization /
- MgO/Al2O3 /
- bonding phase
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图 8 m(MgO)/m(Al2O3)=0.7时烧结矿微观结构((a)、(b)、(c):50X烧结矿矿相图片；(d)、(e)、(f):500X烧结矿不同区域矿相图片，(g)、(h)、(i)分别为200X、500X、1000X烧结矿内部矿相图片)
Figure 8.
表 1 原料的主要化学成分和烧损(干基)
Table 1. Main chemical composition and burning loss of raw materials
/% 原料名称 TFe Ni Cr2O3 MnO CaO MgO Al2O3 SiO2 S 烧损 红土矿-1# 47.88 0.53 3.33 0.69 4.66 0.58 6.62 1.66 0.11 11.55 红土矿-2# 47.72 0.54 5.64 0.65 3.34 1.65 3.98 2.79 0.13 11.03 红土矿-3# 48.37 0.81 3.22 0.80 0.57 0.64 7.89 2.50 0.20 12.29 生石灰 0.42 - - - 79.06 3.36 2.06 4.59 - 6.54 蛇纹石粉 14.64 1.00 1.17 0.27 2.69 25.20 1.55 30.73 0.04 14.15 高炉返矿 51.99 0.87 2.50 1.19 8.54 3.14 5.39 6.13 0.05 - 烧结返矿 52.02 0.86 2.43 1.19 8.46 3.28 5.30 5.97 0.04 - 焦粉 8.00 - - - 5.20 2.51 28.39 48.39 - 82.00 无烟煤 6.61 - - - 1.43 1.31 24.06 52.48 - 88.81 
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表 2 燃料的工业分析
Table 2. Proximate analysis of solid fuels
/% 固体燃料 固定碳(FCdaf) 挥发分(Ad) 灰分(Vdaf) 焦粉 79.37 2.63 18.00 无烟煤 83.80 5.01 11.19 注：d为干燥基，daf为干燥无灰基。
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表 3 化学试剂配加量及混合料主要化学成分
Table 3. Chemical reagents and the main chemical composition of the mixture
No. 配加量/g 主要化学成分/% 红土矿-3# Ca(OH)2 SiO2 MgO TFe CaO MgO Al2O3 SiO2 R2 MgO/Al2O3 1 10 1.19 0.45 0 47.81 8.45 0.64 7.93 6.50 1.30 0.08 2 10 1.20 0.46 0.11 47.27 8.45 1.58 7.84 6.50 1.30 0.20 3 10 1.21 0.48 0.29 46.40 8.45 3.08 7.69 6.50 1.30 0.40 4 10 1.24 0.49 0.48 45.99 8.45 3.82 7.63 6.50 1.30 0.50 5 10 1.27 0.50 0.66 45.56 8.45 4.54 7.55 6.50 1.30 0.60 6 10 1.29 0.52 0.84 44.75 8.45 5.94 7.42 6.50 1.30 0.80
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