提高加盖钢包自开率的研究与实践

首钢京唐300t钢包加盖后自开率明显下降，分析了加盖钢包自开率下降的机理，确定了主要原因是包衬温度升高后造成的液态渣回流。通过对引流砂的流动性、密度和渗钢性研究，设计了一种适用于加盖钢包的引流砂成分配比，并通过控制Al2O3和MgO含量，保证铬矿砂纯度。改进了钢包热修工艺，设计了针对加盖钢包的投砂操作和防钢渣回流措施。研究结果经推广使用后，钢包月不自开炉数由8～9炉降低至2炉以内，综合自开率达99.9%，双精炼工艺自开率达100%。

Research and practice on improving free opening rate of covered ladle

The free opening rate of the 300 t ladle in Shougang Jingtang was obviously reduced after covering. The mechanism of the decrease of the free opening rate of the covered ladle was analyzed, and it determined that the main reason was the liquid slag backflow caused by the increase of the lining temperature. By studying the fluidity, density and steel penetration of the stuffing sand, a proportion of the stuffing sand suitable for the covered ladle was designed, and the purity of the chromite sand was ensured by controlling the content of Al2O3 and MgO. The hot repair process of ladle had been improved, and the feeding pattern of sand and the measures of avoiding slag backflow for the covered ladle had been designed. After the research results were promoted and used, the number of ladles not free opened was reduced from 8 9 heats to less than 2 heats. The comprehensive free opening rate was 99.9%, and the duplex process free opening rate was 100%.