为降低碱金属对高炉的危害，提高炉渣的排碱能力，采用气渣平衡法测定了1723 K时高炉渣的钾容量。依据广钢实际高炉渣成分，用纯化学试剂配制炉渣，用一定组成K(g)COCO2Ar混合气体提供一定的氧分压和钾分压。研究表明：试验条件下， w(MgO) 和w(Al2O3)一定时，钾容量随w(CaO)/w（SiO2)的增大而减小；在w(CaO)/w(SiO2)和w(Al2O3)一定时，钾容量随w(MgO)的增大而增大；在w(CaO)/w(SiO2)和w(MgO)一定时，钾容量随w(Al2O3)的增大而增大；当［w(CaO)+w(MgO)］/w(SiO2)和w(Al2O3)固定不变时，增加w(MgO)，降低w(CaO) ，钾容量明显增大。广钢炉渣的合理成分为：w(CaO)/w(SiO2) 保持在1.0，w(MgO)保持在12%～15%，w(Al2O3)不超过15%。
In order to reduce harmful effect of alkali metals on blast furnace operation, improve the alkali capacity of BF slag, the potassium capacity of BF slag was studied at 1723 K using gasslag equilibrium technique. According to the real composition of BF slag at Guangzhou steel, the pure chemistry reagents were used to make the slags，the slags were equilibrated with a mixture gas of K(g)COCO2Ar to provide the partial pressure of oxygen and potassium. Under the experimental condition, it is shown that at fixed MgO and Al2O3 contents the potassium capacity is decreased with increasing w(CaO)/w(SiO2) ratio, at constant w(CaO)/w(SiO2) ratio and Al2O3 content the increase of MgO content results in the increase of potassium capacity, the rising Al2O3 content at fixed w(CaO)/w(SiO2) ratio and MgO content significantly increases the potassium capacity, and at constant (w(CaO)+w(MgO))/w(SiO2) ratio and Al2O3 content, the potassium capacity increases apparently with increasing MgO content and decreasing CaO content. The proper composition of slag at Guangzhou steel is:w(CaO)/w(SiO2)=1.0, MgO content in the range of 12%15%, Al2O3 content less than 15%.
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