ABSTRACT

A huge amount of coke breeze with its particles size smaller than 10 mm, is generated and accumulated during coke production, transportation and crushing process, which cannot be effectively used, causing wasting of coke resource. Cold briquetting of coke breeze was investigated in this study to produce formed coke with certain size and strength to satisfy the demands of metallurgical industry. Sodium carboxymethyl cellulose (CMC-Na) and bentonite were added as binders, and damp milling was adopted to pretreat raw materials as enhancement. The effects and mechanisms of binders and pretreatment on the strength of green and dried briquettes were systematically studied in this work. The results showed that both the strength of green and dried briquette were improved greatly when using the mixtures of CMC-Na and bentonite as the composite binder, and they were further enhanced by the pretreatment of damp milling process. The drop strength of green briquettes was 18.2 times/0.5 m, and the compressive strength of dried briquettes of 100°C was 931.8 N/briquettes⁻¹, when the coke breeze was cold briquetted with 0.5% CMC-Na and 6% bentonite after pretreating of damp milling.

摘要

在焦炭生产、运输和破碎过程中产生并积累了大量粒径小于10毫米的焦粉，无法得到有效利用，造成焦炭资源的浪费。本研究对焦粉冷压块进行了研究，以生产具有一定尺寸和强度的成型焦，以满足冶金工业的需求。添加羧甲基纤维素钠（CMC-Na）和膨润土作为粘合剂，采用湿磨法对原料进行预处理作为增强剂。本文系统地研究了粘合剂和预处理对生坯和干煤球强度的影响和机理。结果表明，使用CMC-Na和膨润土的混合物作为复合粘合剂时，生型煤和干燥型煤的强度都有很大的提高，并且通过湿磨工艺的预处理进一步增强了它们。生煤球落下强度为18.2次/0.5 m，干燥煤球100℃抗压强度为931.8 N/煤球^-1，当焦粉在湿磨预处理后用0.5% CMC-Na和6%膨润土冷压块时。