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Effect of polymer flow aids on LD iron ore flowability
Powder Technology ( IF 5.2 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.powtec.2020.09.023
N. Gurulaxmi Srikakulapu , Sai Srikar Cheela , Virendra K Bari , Asim Kumar Mukherjee , Atul K. Bhatnagar

Abstract Numerous industries including detergent, food, mining, pharmaceutical and powder metallurgy have commonly encounted flow issues due to undesirable transform of readily free flowing solids to a coherent solid. In the present study, the flow properties of LD iron ore were studied in the presence of polymer flow aids such as superabsorbent polymers (SAP). The effect of moisture, clay content, SAP dosage and its retention time on flow properties of wet sticky iron ore were explored. Flow properties such as Hausner ratio (HR), Carr index (CR), flow function index, effective angle of internal friction and cohesion were measured using Powder flow tester. Results indicated that LD iron ore exhibited free flow at dry condition and very poor flow at 8%, 10% and 12% moistures. In the presence of SAP, LD iron ore has changed its flow behaviour to easy flow regime due to their high affinity for moisture absorption. Optimum dosages of SAP were found to be 1200 ppm, 1400 ppm and 1800 ppm for these wet sticky LD iron ores of 8%, 10% and 12% moistures respectively. Experimental data concluded that SAP dosage was based on moisture content, clay content and % of fines fraction in the ore.

中文翻译:

聚合物助流剂对LD铁矿石流动性的影响

摘要 包括洗涤剂、食品、采矿、制药和粉末冶金在内的许多行业都普遍遇到流动问题,因为容易自由流动的固体不合需要地转变为凝聚的固体。在本研究中,LD 铁矿石的流动特性在聚合物流动助剂如高吸水性聚合物 (SAP) 存在下进行了研究。探讨了水分、粘土含量、SAP用量及其保留时间对湿粘铁矿石流动特性的影响。使用粉末流动测试仪测量流动特性,例如豪斯纳比(HR)、卡尔指数(CR)、流动函数指数、有效内摩擦角和内聚力。结果表明,LD 铁矿石在干燥条件下表现出自由流动性,在 8%、10% 和 12% 的水分条件下流动性非常差。在 SAP 的存在下,LD 铁矿石由于吸湿性高,已将其流动行为改变为易流动状态。对于这些水分含量为 8%、10% 和 12% 的湿粘性 LD 铁矿石,发现 SAP 的最佳剂量分别为 1200 ppm、1400 ppm 和 1800 ppm。实验数据得出的结论是,SAP 用量取决于矿石中的水分含量、粘土含量和细粒部分的百分比。
更新日期:2021-01-01
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