拜耳法赤泥含碳冷固结球团力学性能的正交试验
Orthogonal Experiment on Mechanical Properties of Red Mud Containing Carbon Cold-Bonded Pellets by Bayer Process

在赤泥中加入水玻璃、水、水泥、碳，原料经过混合后用对辊压球机压制成冷固结球团。进行了4因素3水平的正交试验，测试了球团静置1、2、3、5、7天后的抗压强度，以及球团静置7天后的落下强度。试验结果表明：在本文研究的正交试验因素及其含量水平上，对赤泥球团抗压强度影响最大的是水玻璃；而对静置7天的赤泥球团的落下强度影响较大的因素是水和水玻璃，水泥和碳对球团落下强度影响较小。静置168 h后，球团抗压强度的最优配方组合为：6%水玻璃 + 12%水 + 9%水泥 + 6%碳(质量分数，外配，下同)。静置168 h后，球团 落下强度的最优配方组合为：6%水玻璃 + 15%水 + 3%水泥 + 6%碳。
Sodium silicate, water, cement and carbon are added to the red mud, and the raw materials are mixed and pressed into cold-bonded pellets by a pair of roller ball press machine. The compressive strength of pellets after 1, 2, 3, 5 and 7 days of static storage and the drop strength of pellets after 7 days of static storage were tested by orthogonal experiment with 4 factors and 3 levels. Experimental results show that in the orthogonal experiment factors and content levels studied in this paper, the compressive strength of red mud pellets is the biggest impact of the sodium silicate; water and sodium silicate had greater impact on drop strength of the pellets, cement and carbon less affected the drop strength. After 168 hours storage, the optimal factors combination of compressive strength of pellets was 6% sodium silicate + 12% water + 9% cement + 6% carbon (mass fraction). After 168 hours storage, the optimal factors combination of drop strength of pellets was 6% sodium silicate + 15% water + 3% cement + 6% carbon.