某钢铁厂除尘灰强化造球试验研究

将某钢铁厂的4种除尘灰根据现场实际产灰情况配成混合灰，通过在母球长大阶段喷洒按中南大学专利技术制备的纤维化膨润土矿浆进行强化造球，并与常规造球进行对比。试验结果表明：对于普通膨润土用量为0.5%、1.0%、1.5%、2.0%的各种母球，强化造球均能显著改善球团性能。以普通膨润土用量为2.0%的母球为例，此时所得强化球团与常规球团相比，膨润土总用量仅增加0.05个百分点，而生球的落下强度和抗压强度可分别从18.3次和19.2 N/个提高到21.2次和21.7 N/个、爆裂温度可从240 ℃提高到274 ℃，干球的抗压强度可从68 N/个提高到76 N/个、粉化率可从0.78%降低到0.51%，从而很好地满足转底炉还原工艺对球团质量的高要求。

Enhancing Pelletizing Tests of Steel Plant Dust

According to the actual produced dust in a steel plant, four kinds of steel plant dusts are mixed with fibrosis bentonite prepared by the Central South University with patented technology at cue ball growing stage to strengthen the palletizing. The new pellet is compared with the conventional palletizing. The test results showed that for each kind of cue ball with ordinary bentonite dosage of 0.5%, 1.0%, 1.5%, 2.0%, the enhancing pelletizing can significantly improve the performance of the pellets. Taking the cue ball with ordinary bentonite of 2.0% for example, the enhancing palletizing contains the total amount of bentonite increased by only 0.05% compared with the conventional pellets, while the green ball owns the drop strength and compressive strength from 18.3 times, 19.2 N/P to 21.2 times, 21.7 N/P respectively, and its explosion temperature is increasing from 240 ℃ to 274 ℃，the compressive strength and of the dry ball rise from 68 N/P to 76 N/P and its pulverization rate decreases from 0.78% to 0.51%, which totally meet the quality requirements of rotary hearth furnace reduction process.