硬质合金辊环的高温法回收与循环利用

Recycling of Cemented Carbide Ringby High Temperature Method

硬质合金被誉为"工业的牙齿",由90%以上由钨钴镍等战略贵重金属构成,实现硬质合金的循环利用意义重大。辊环是螺纹钢轧制所需用到的材料,也是硬质合金的最为主要的应用材料之一,其由粗晶粒碳化钨和钴镍等组成。为开发经济高效的硬质合金辊环循环利用方法,本论文探索将报废的硬质合金辊环进行高温法回收,将回收的粉末再制成硬质合金辊环。通过性能检测及实际使用,发现高温回收料辊环的抗弯强度和断裂韧性仅略差于原生料辊环,等过钢量轧钢后其修磨量仅略大于原生料辊环,完全满足轧钢工况对硬质合金辊环的使用要求,证明硬质合金辊环的高温回收法循环利用是可行的。

Cemented carbide is well known as the"industrial tooth",which is predominantly composed of strategicprecious metals such as tungsten,cobalt and nickel.It would be of great significance to efficiently realize the recycling ofcemented carbide.Roll ring is an essential material for the rolling of rebar,and is also one of the most important applicationsfor cemented carbide.Roll rings mainly consist of coarse-grained tungsten carbide,cobalt and nickel.In order to develop acost-effective recycling method for cemented carbide ring,the high-temperature recovery of scrapped cemented carbide roll isexplored in this paper.The recovered powder is reused as raw materials for manufacturing cemented carbide rings,whichhave undergone the measurement of physicochemical propertiesand practical application.It is found that the bending strengthand fracture toughness of the prepared cemented carbide ring by the high-temperature recycled powder are only slightly worsethan that of the standard ring,and after passing through the same amount of steel to be rolled,the surface roughness ingrinding is only slightly larger than that of the original cemented carbide ring,which proves that the recycling of scrappedcemented carbide ring based on the high temperature recovery method is technologically feasible.