LF热态渣循环利用技术

 LF热态渣的循环利用可减少废渣排放，降低对环境的危害。对LF热态循环渣的脱硫能力及可回收性进行了分析，热态循环渣返回LF炉和转炉参与冶金反应后，可大幅降低渣料消耗，LF炉每罐回收热态循环渣1～1.5 t，平均节省石灰及其他助溶剂用量5 kg/t（钢），转炉每罐回收热态循环渣3～5 t，渣料消耗平均降低10～15 kg/t（钢）。采用热态循环渣配加石灰的LF炉造渣制度后，在相同的处理时间内，处理终点钢水中硫质量分数与常规处理几乎相同，同时节省了能源消耗，但必须考虑对钢水增硅、增锰的影响。热态循环渣返回转炉后导致入炉铁水温度低及吹炼过程渣量较大，因此转炉吹炼全程以低枪位操作更为适宜。在不影响生产组织的情况下，热态渣以返回转炉循环利用为最佳途径。

Recycling of LF hot steel slag from ladles

The recycling of LF hot steel slag of casting residue from ladles can reduce the release of waste slag and the harm to the environment. The paper analyzed the desulphurizing ability and recuperability of LF hot steel slag. It can decrease the consumption of slag charge critically after LF hot steel slag were recycled to the BOF or LF and took part in the metallurgic reaction. It can reduce the consumption of lime 5 kg/t after recycling LF hot steel slag 1-1.5 t per ladle. And it can cut the consumption of slag charge 10-15 kg/t after recycle casting residue 3-5 t per ladle. After adopting the slagging regime of adding lime powder to hot steel slag in LF，the end-point sulphur content was almost the same with the normal treatment with the same time since the slagging rate was improved， meanwhile the process saved the power consumption，but the effect on the pick-up of silicon and magnesium in molten steel should be considered. The hot recycling of casting residue lows the temperature of molten iron into the converter for steel-making，thus the low lance level during the whole BOF treating process was preferable. Under the condition of not influencing the production，the best utilizing method of hot slag lies in the application of LF hot steel slag into the converter.