H13模具钢切削废屑回收处理工艺对合金元素回收率的影响

为对H13模具钢切削废屑加以回收利用,提高Cr、Mo、V等合金元素的回收率,采用50 t中频感应炉-LF-VD流程对切削废屑进行返回法熔炼H13钢。分析了固化压块和低真空熔化工艺对Cr回收率的影响和CaO-BaO复合渣系BaO含量对脱磷效果的影响。结果表明,对废屑进行固化成块处理、采用≤1 333 Pa低真空熔化,可以将废屑中Cr、Mo、V的回收率提高到96%以上,与用未压制的切削废屑熔炼相比,节约熔化时间25 min/炉,在熔化期采用高碱度的CaO-20%BaO复合渣系进行除磷,可以将产品中P含量控制在0.01%。

Effect of Recovery and Treatment Process of Die Steel H13 Cutting Scrap on Yield of Alloy Elements

In order to recover and apply the cutting scrap of die steel H13 and increase the yield of Cr, Mo, V etc alloy elements, the die steel H13 is melted by return cutting scrap method in 50 t medium frequency induction furnace- LF- VD flowsheet. The effect of curing pressed block and low vacuum melting process on Cr yield and the effect of BaO content in CaO-BaO compound slag series on dephosphorizing results are analyzed. Results show that with curing pressed block treatment and melting on ≤1 333 Pa low vacuum condition the yield of Cr, Mo and V in cutting scrap increases to more than 96% , as compared with non-using curing pressed block treatment, the melting time decreases by 25 min/heat. During melting period, dephosphorization process is carried out by high basicity CaO-20% BaO compound slag series, the P content in products shall be controlled to 0. 01%.